CN104466972B - Voltage reactive distribution type control method making substation and power distribution network being harmonious - Google Patents
Voltage reactive distribution type control method making substation and power distribution network being harmonious Download PDFInfo
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- CN104466972B CN104466972B CN201410779212.4A CN201410779212A CN104466972B CN 104466972 B CN104466972 B CN 104466972B CN 201410779212 A CN201410779212 A CN 201410779212A CN 104466972 B CN104466972 B CN 104466972B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The invention provides a voltage reactive distribution type control method making a substation and a power distribution network being harmonious. The voltage reactive distribution type control method comprises the steps that firstly, voltage reactive state information of the substation and voltage reactive state information of a reactive compensation device of the power distribution network subordinate to the substation are collected in real time through a wide area measuring information system, and the switching state information of the reactive compensation device is controlled; secondly, whether the substation and the power distribution network meet respective examination requirements is judged according to the voltage reactive state information of the substation and the power distribution network; finally, a preset substation and power distribution network harmony control strategy is executed according to an examination and evaluation result of the substation and the power distribution network. According to the voltage reaction distribution type control method, only the voltage reactive state information of a part of devices in the power distribution network is collected, the operation states of the substation and the power distribution network can be accurately judged through sensitivity calculation, the data volume of real-time collection and the data volume of calculation are small, the calculation speed is high, the installation cost and the operation and maintenance cost of a collecting and controlling device is small, the practicability is high, and application and popularization are convenient.
Description
Technical field
The present invention relates to power system transformer substation and power distribution network Coordinated Control field, more particularly, it relates to electric power
The voltage power-less distribution of coordination is joined at a kind of station that system terminal 110kV (or 35kV) transformer station and its subordinate's power distribution network coordinate to control
Formula control method.
Background technology
At present, the voltage power-less installed in power system terminal 110kV (or 35kV) transformer station and in subordinate's power distribution network
The regulation and control criterion of adjusting device is independently controlled according only to the real-time measuring data at mount point, the tap of main transformer in transformer station
The regulation of first gear position judges according only to the actual measurement voltage of transformer station's outgoing line side, the switching of interior reactive-load compensation equipment of stand according only to
The reactive power (or power factor) of transforming plant lead-in side judges, the mesolow reactive-load compensation equipment in distribution is according only to this
The reactive requirement on the spot of equipment carries out switching.Do not carry out mutual the whole network between one-end substation and its subordinate's distribution and coordinate control
System, in the range of often occurring that transformer station's outgoing line side voltage, inlet wire side power factor are in interval of acceptance, in distribution, voltage power-less is adjusted
In the range of joint means have been used up and the most out-of-limit situation of distribution transforming voltage, or in distribution, distribution transforming voltage is in interval of acceptance, power transformation
Stand the situation that regulating measure is used up and interior voltage power-less of standing is the most out-of-limit, or transformer station is satisfied by voltage power-less examination with distribution
Requirement, but the network loss of power distribution network is higher, it is also possible to reduce the situation of network loss further.
At this time, it may be necessary to transformer station and subordinate's power distribution network thereof fully excavate respective regulating power, implement transformer station and under
Level power distribution network automatically assist adjust, by the whole network regulation make transformer station and subordinate's power distribution network thereof farthest meet examination want
Ask, reduce network loss simultaneously, thus propose to implement " coordination is joined at station " control to come research and discovery excavate further one-end substation and
Its subordinate's power distribution network runs the means of control and regulation potentiality.
The method controlled coordinated by existing transformer station and its subordinate's power distribution network, in the 01st phase " electrification of the countryside " in 2011
" transformer station, circuit, the three grades of joint debuggings of distribution transforming voltage " literary composition, disclosed method is: first, Real-time Collection distribute-electricity transformer district low-voltage customer
Voltage, distribution transforming voltage power-less state, pressure regulator voltage, main transformer voltage power-less state, and the voltage of transformer station, circuit and distribution transforming
Idle control status information of equipment；Secondly, analyze by subordinate to higher level according to low-voltage customer, distribution transforming, pressure regulator, the order of main transformer
Voltage is the most out-of-limit, higher level to subordinate regulate voltage control apparatus and make out-of-limit voltage qualified；Then, according to main transformer, circuit,
The order of distribution transforming is analyzed idle the most out-of-limit by higher level to subordinate, by subordinate to higher level regulate idle control equipment make out-of-limit without
Merit power is qualified.
But the major defect of the method is:
1) the method only embodies when low-voltage customer is more prescribed a time limit, can be by regulation transformer station, circuit and the electricity of distribution transforming
Pressure Reactive-power control equipment is to improve low-voltage customer voltage, but it is out-of-limit and when cannot regulate not embody transforming plant voltage reactive,
How by the voltage power-less equipment in regulation distribution to improve the voltage power-less state of transformer station, and do not embody transformer station
More do not prescribe a time limit with the voltage power-less of distribution, the method how reaching to reduce network loss further；
2) first voltage status is judged and regulates by the method, after voltage-regulation completes, then enters idle state
Row judges and regulation, but in practical power systems, voltage has intercouple to contact with idle, it is impossible to separate regulation；
3) the method formulate the idle coordination control strategy of tertiary voltage do not account for transforming plant main transformer tap gear with
And action frequency every day of station inner capacitor group limits, it is likely to result in main transformer tap gear and station inner capacitor group action frequency
Out-of-limit；
4) the method needs to measure in real time the low-voltage customer voltage of whole power distribution network, distribution transforming voltage power-less state, pressure regulator
Voltage, main transformer voltage power-less state, and the voltage & var control status information of equipment of transformer station, circuit and all distribution transformings are right
For power distribution network, its measurement apparatus is the hugest with the installation quantity controlling device, the installation cost brought and operation maintenance
Cost is the biggest, is the most generally suitable for for actual large-scale power distribution network.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art, it is provided that one can improve terminal power transformation largely
The outgoing line side rate of qualified voltage stood and inlet wire side power factor qualification rate, in raising power distribution network, the voltage of distribution low-voltage side is qualified
Rate, and distribution network loss is greatly reduced；And the station with general applicability joins the voltage power-less distributed AC servo system of coordination
Method.
Technical scheme is as follows:
The voltage power-less distributed control method of coordination is joined at a kind of station, first, is adopted in real time by wide area measurement information system
Collection transformer station and the voltage power-less status information of subordinate's distribution network var compensation equipment thereof, control the switching shape of reactive-load compensation equipment
State information；Then, judge that transformer station and power distribution network are the fullest according to the voltage power-less status information of transformer station Yu power distribution network
The check requirements that foot is preset；Finally, coordination control is joined at the station performing to preset according to the examination assessment result of transformer station with power distribution network
Strategy.
As preferably, transformer station includes with the examination assessment result of power distribution network:
Transformer station meets voltage power-less appraisal standards, and power distribution network meets voltage appraisal standards；
Transformer station meets voltage power-less appraisal standards, and power distribution network is unsatisfactory for voltage appraisal standards；
Transformer station is unsatisfactory for voltage power-less appraisal standards, and power distribution network meets voltage appraisal standards；
Transformer station is unsatisfactory for voltage power-less appraisal standards, and power distribution network is unsatisfactory for voltage appraisal standards.
As preferably, when transformer station is unsatisfactory for voltage power-less appraisal standards, and power distribution network is unsatisfactory for voltage appraisal standards, adjust
The principle that control is followed is: in first passing through regulation transformer station, voltage power-less equipment meets transforming plant voltage reactive check requirements, so
Distribution network voltage check requirements is met, if transformer station or power distribution network are still unsatisfactory for afterwards by regulation distribution network var compensation equipment
Check requirements, then carry out mutually coordinated control.
As preferably, first, meet transforming plant voltage reactive check requirements by voltage power-less equipment in regulation transformer station；
Then, performing transformer station and meet voltage power-less appraisal standards, power distribution network is unsatisfactory for control strategy during voltage appraisal standards；If
In transformer station, voltage power-less equipment is unsatisfactory for transforming plant voltage reactive check requirements again, then calculate the real-time of each region in feeder line
Reactive requirement, if reactive-load compensation equipment has regulation nargin in feeder line, then according to reactive power demand, according to benefit idle in feeder line
Repay the idle order descending to the sensitivity coefficient of voltage at minimum or the highest distribution transforming voltage of injection at equipment position
Put into or excise, meet the voltage check requirements of distribution low-voltage side；If after above-mentioned regulation, power distribution network meets voltage
Appraisal standards, and transformer station is unsatisfactory for voltage power-less appraisal standards, then performing power distribution network meets voltage appraisal standards, and transformer station is not
Meet the control strategy of voltage power-less appraisal standards, otherwise, terminate regulation process.
As preferably, when transformer station meets voltage power-less appraisal standards, and power distribution network is unsatisfactory for voltage appraisal standards, first
The reactive power demand in each region in calculating feeder line；
If reactive-load compensation equipment has regulation nargin in feeder line, then according to historical trend information, calculate in feeder line low pressure without
It is idle to the sensitivity coefficient of voltage at actual measurement distribution transforming that merit compensates injection at equipment position, and detection power distribution network owns in real time
10kV branch line head end and the distribution transforming of end place and be provided with the low-pressure side voltage of low-pressure reactive compensation equipment place distribution transforming, find more
Minima or distribution transforming corresponding to maximum in the low-pressure side voltage of the distribution transforming of limit, according to the reactive power need in region each in feeder line
Asking, idle to the sensitivity coefficient of voltage at this distribution transforming according to injecting at low-pressure reactive compensation equipment, descending order is entered
Row puts into, or ascending order is excised；In distribution reactive-load compensation equipment meet distribution low-voltage side voltage examination want
Asking, in transformer station, voltage power-less meets check requirements all the time simultaneously.
As preferably, when transformer station is unsatisfactory for voltage power-less appraisal standards, and power distribution network meets voltage appraisal standards, power transformation
Situation and control strategy that the main transformer outgoing line side voltage stood is idle with inlet wire side in station are as follows:
When main transformer outgoing line side Over High-Limit Voltage or more lower limit, and in standing, the idle nothing in inlet wire side the most in limited time, first adjusts main transformer
Outgoing line side voltage is to normal range, otherwise, excises or put into reactive-load compensation equipment in station；Voltage power-less regulating measure in if stood
Use up and the main transformer outgoing line side voltage the most more upper limit or more lower limit, then regulation distribution network var compensation equipment, excises or puts into and join
Inject the reactive power compensator of the idle bigger position of sensitivity to main transformer low-pressure side voltage in net, ensure that power distribution network is full simultaneously
Afc voltage check requirements；
When main transformer outgoing line side voltage is without out-of-limit, and when the interior idle more upper limit in inlet wire side in station or more lower limit, first put into or cut
Except the reactive power compensation of reactive-load compensation equipment in station, regulation main transformer high-pressure side is idle to normal range, if in station voltage without
Merit regulating measure has been used up and the idle upper limit of still getting in main transformer high-pressure side, then regulation distribution network var compensation equipment, puts into or excise
Inject the reactive power compensator of the idle bigger position of the sensitivity idle to feeder line critical point in distribution, ensure that power distribution network is full simultaneously
Afc voltage check requirements；
When the idle the most more upper limit in inlet wire side or more lower limit in main transformer outgoing line side voltage with station, first adjust main transformer outgoing line side electric
In being pressed onto normal range, then regulation station, inlet wire side is idle, if the idle the most more upper limit in main transformer high-pressure side or more lower limit, puts into the most again
Or excision station in reactive-load compensation equipment, if station in voltage power-less regulating measure used up and main transformer high-pressure side idle still get over the upper limit
Or more lower limit, then regulation distribution network var compensation equipment, inject the idle spirit idle to feeder line critical point in putting into or excise distribution
The reactive power compensator of the bigger position of sensitivity, ensures that power distribution network meets voltage check requirements simultaneously；
When main transformer outgoing line side voltage gets over lower limit, the idle more upper limit in inlet wire side in standing, or main transformer outgoing line side Over High-Limit Voltage,
In standing during the idle more lower limit in inlet wire side, first put into or excise the reactive power compensation of the interior reactive-load compensation equipment in station, regulate main transformer
High-pressure side is idle to normal range, and detection main transformer low-pressure side voltage is the most normal, if main transformer outgoing line side voltage still get over lower limit or
The more upper limit, then adjust main transformer outgoing line side voltage to normal range；If put into or in excision station after reactive-load compensation equipment, main transformer is high
The pressure idle the most more upper limit in side or more lower limit, in standing, voltage power-less regulation equipment cannot be adjusted again, then adjust power distribution network idle
Compensation equipment, injects the reactive-load compensation of the idle bigger position of the sensitivity idle to feeder line critical point in putting into or excise power distribution network
Device, ensures that power distribution network meets voltage check requirements simultaneously.
As preferably, when transformer station meets voltage power-less appraisal standards, and power distribution network meets voltage appraisal standards, first count
The reactive power demand in each region in calculation feeder line, then according to inject idle to net at reactive-load compensation equipment position in feeder line
The sensitivity coefficient damaged, descending order puts into, or ascending order is excised；Meet transformer station and
On the premise of the voltage power-less check requirements of power distribution network, the reactive power demand in each region in simultaneously meeting feeder line, reduce distribution
Net network loss.
As preferably, before gathering the voltage power-less status information of transformer station and subordinate's distribution network var compensation equipment thereof,
Determine that station is joined coordination and controlled the moment according to daily load curve, particularly as follows:
Initially with load curve fusion method, transformer station's outgoing line side reactive power daily load curve is carried out segmentation, according to
Transforming plant main transformer tap gear action frequency every day is limited to x time, and daily load curve is divided into x section；Then m period system
Equivalent reactive power is Qm, then adjacent time interval m and m+1 load variations amount absolute value are:
ΔQm=| Qm-Qm+1|；
Wherein, Δ QmFor adjacent time interval m and m+1 load or burden without work variable quantity absolute value, QmIt it is the equivalence nothing of m period system
Merit power, Qm+1It it is the equivalent reactive power of m+1 period system；
By Δ QmQ time minimummCorresponding period m and m+1 merges into a new period m, with former period m initial time
Load level characterize merge after the load level of new period m；
Repeat merging process, until remaining fixed number reaches expected numbers x, after having merged, with each new time
The initial time of section is joined coordination as station and is controlled the moment.
As preferably, join coordination according to station and control the moment and transformer station and subordinate's power distribution network thereof are carried out station join coordination control；
Believed by the voltage power-less state of equipment component in wide area measurement information system, Real-time Collection transformer station and subordinate's power distribution network thereof
Breath, including:
Power distribution network all 10kV branch line head end and the distribution transforming of end place and the place distribution transforming of low-pressure reactive compensation equipment is installed
Low-pressure side information of voltage Uzi；
The meritorious P at feeder line critical pointg, idle QgInformation；
Main transformer low-pressure side and on high-tension side voltage UlAnd Uh, active-power PlAnd Ph, reactive power QlAnd Qh；
The switching status information of control equipment, including the input capacity Qc of distribution low-voltage side reactive power compensatorpt, circuit without
The input capacity Qc of Reactive power compensation installationslr, main transformer tap gear D, the input capacity Qc of Reactive Power Compensation Eqyuipment in SubstationT。
As preferably, it is judged that whether transformer station and subordinate's power distribution network thereof meet respective voltage power-less appraisal standards, specifically
Step is as follows:
1) input transformer station and the voltage power-less appraisal standards of power distribution network:
Input transformer station outgoing line side voltage appraisal standards UT1～UT2；Input transforming plant lead-in side power factor standardIncluding peak hours power factor appraisal standardsPower factor appraisal standards during low ebb load
Input distribution low-voltage side 220V single phase power supply voltage appraisal standards Up1～Up2；
2) judge whether transformer station and power distribution network meet voltage power-less appraisal standards:
Whether transformer station meets voltage power-less appraisal standards, particularly as follows: main transformer low-pressure side voltage UlWhether meet transformer station
Outgoing line side voltage appraisal standards UT1～UT2, and main transformer high-pressure side power factorWhether meet transformer station to enter
Line side power factor standard
Whether power distribution network meets voltage appraisal standards, particularly as follows: power distribution network all 10kV branch line head end and end place are joined
Become and be provided with the low-pressure side voltage U of low-pressure reactive compensation equipment place distribution transformingziWhether meet the single-phase confession of 220V of distribution low-voltage side
Piezoelectric voltage appraisal standards Up1～Up2Qualification rate reach more than 90%.
Beneficial effects of the present invention is as follows:
Method of the present invention can be unsatisfactory for check requirements and distribution network var compensation by distribution transforming voltage in power distribution network
When equipment is without regulation nargin, by voltage power-less equipment in suitably regulation transformer station to improve the running status of power distribution network, more greatly
Degree ground improves the rate of qualified voltage of power distribution network；Can in transformer station voltage or reactive power constraints and stand interior voltage power-less equipment without
During regulation nargin, by suitably regulation distribution network var compensation equipment to improve the running status of transformer station, carry largely
The rate of qualified voltage of high transformer station and power factor qualification rate；Voltage can be met in transformer station and subordinate's power distribution network thereof simultaneously
During idle check requirements, by suitably regulation distribution network var compensation equipment to improve the running status of power distribution network, largely
Ground reduces distribution network loss；Action frequency every day considering main transformer tap gear in transformer station limits, it is possible to ensure often
Meet the voltage power-less check requirements of transformer station and its subordinate's power distribution network in day action frequency restriction as far as possible.
Method of the present invention only gathers the voltage power-less status information of equipment component in power distribution network, by sensitivity meter
Calculate and just can judge transformer station and the running status of power distribution network exactly and control accordingly, Real-time Collection and the number of computing
Little according to amount, calculate speed fast, gather and to control the installation cost of equipment less with operation expense, practical, it is simple to push away
Wide application.
The composite can be widely applied to the coordination of power system 110kV (or 35kV) one-end substation and its subordinate's power distribution network
Control, lay reliable basis for transformer station with its subordinate's power distribution network synthesis idle work optimization analysis, for promoting China's power distribution network
The development of reactive voltage operation and management level and intelligent distribution network correlation theory and technology is significant.
Accompanying drawing explanation
Fig. 1 is to judge whether transformer station and power distribution network meet voltage power-less appraisal standards flow chart；
Fig. 2 is 2. to plant the control strategy that situation is taked for the；
Tu3Shi transformer station nine-area control；
Fig. 4 is 3. to plant situation " 1 " for or control strategy that " 5 " region is taked；
Fig. 5 is 3. to plant situation " 3 " for or control strategy that " 7 " region is taked；
Fig. 6 is 3. to plant situation " 2 " for or control strategy that " 6 " region is taked；
Fig. 7 is 3. to plant situation " 4 " for or control strategy that " 8 " region is taked；
Fig. 8 is 4. to plant situation " 1 " for or control strategy that " 5 " region is taked；
Fig. 9 is 4. to plant situation " 3 " for or control strategy that " 7 " region is taked；
Figure 10 is 4. to plant situation " 2 " for or control strategy that " 6 " region is taked；
Figure 11 is 4. to plant situation " 4 " for or control strategy that " 8 " region is taked；
Figure 12 is transformer station's outgoing line side reactive power daily load curve segmentation result.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is described in further detail.
The voltage power-less distributed AC servo system strategy design of coordination is joined at a kind of station of the present invention, by wide area measurement information
The voltage power-less status information of equipment component in system Real-time Collection transformer station and subordinate's power distribution network thereof, and control the throwing of equipment
Cut status information；Voltage power-less status information further according to transformer station Yu power distribution network judges whether it meets respective examination and want
Ask；Then, corresponding station is taked to join coordination control strategy according to transformer station's examination respective with power distribution network assessment result.
Specifically comprising the following steps that of described method
Step (1): determine that station is joined coordination and controlled the moment according to daily load curve.
Initially with load curve fusion method, transformer station's outgoing line side reactive power daily load curve is carried out segmentation, according to
Transforming plant main transformer tap gear action frequency every day is limited to x time, and daily load curve is divided into x section.If m period system
Equivalent reactive power is Qm, then adjacent time interval m and m+1 load variations amount absolute value are:
ΔQm=| Qm-Qm+1|；
Wherein: Δ QmFor adjacent time interval m and m+1 load or burden without work variable quantity absolute value, QmIt it is the equivalence nothing of m period system
Merit power, Qm+1It it is the equivalent reactive power of m+1 period system.
Find Δ QmQ time minimummThe corresponding period, period m and m+1 is merged into a new period m, with former period m
The load level of initial time characterizes the load level of new period after merging.Repeat merging process, until remaining fixed number
Till reaching expected numbers x.After having merged, join coordination using the initial time of day part as station and control the moment.
Step (2): Real-time Collection transformer station and the status information of subordinate's power distribution network thereof.
After step (1) completes, according to the control moment determined, transformer station and subordinate's power distribution network thereof are carried out station and join coordination control
System.By the voltage power-less state of equipment component in wide area measurement information system, Real-time Collection transformer station and subordinate's power distribution network thereof
Information, including power distribution network all 10kV branch line head end and the distribution transforming of end place be provided with the place distribution transforming of low-pressure reactive compensation equipment
Low-pressure side information of voltage Uzi, the meritorious P at feeder line critical pointg, idle QgInformation, main transformer low-pressure side and on high-tension side voltage UlAnd
Uh, active-power PlAnd Ph, reactive power QlAnd Qh；And the switching status information of control equipment, including distribution low-voltage side
The input capacity Qc of reactive power compensatorpt, the input capacity Qc of reactive power compensation system devicelr, main transformer tap gear D, power transformation
Stand the input capacity Qc of reactive power compensatorT。
Step (3): judge whether transformer station and subordinate's power distribution network thereof meet voltage power-less appraisal standards.
After step (2) completes, according to the voltage power-less status data of step (2) Real-time Collection, it is judged that transformer station and under
Whether level power distribution network meets respective voltage power-less appraisal standards, specifically comprises the following steps that
Step 3.1): input transformer station and the voltage power-less appraisal standards of power distribution network.
Input transformer station outgoing line side voltage appraisal standards UT1～UT2；Input transforming plant lead-in side power factor standard
Including peak hours power factor appraisal standardsPower factor appraisal standards during low ebb loadInput is joined
Low pressure side 220V single phase power supply voltage appraisal standards Up1～Up2。
Step 3.2): judge whether transformer station and power distribution network meet voltage power-less appraisal standards.
Step 3.1) complete after, judge that whether it meet each according to the voltage power-less status information of transformer station and power distribution network
Appraisal standards, be divided into following four situation:
The 1. to plant situation be that transformer station meets voltage power-less appraisal standards, i.e. main transformer low-pressure side voltage UlMeet transformer station
Outgoing line side voltage appraisal standards UT1～UT2, and main transformer high-pressure side power factorMeet transforming plant lead-in side
Power factor standardPower distribution network meets voltage appraisal standards, i.e. power distribution network all 10kV branch line head end and end place is joined
Become and be provided with the low-pressure side voltage U of low-pressure reactive compensation equipment place distribution transformingziMeet distribution low-voltage side 220V single phase power supply electricity
Pressure appraisal standards Up1～Up2Qualification rate reach more than 90%.
The 2. to plant situation be that transformer station meets voltage power-less appraisal standards, i.e. main transformer low-pressure side voltage UlMeet transformer station
Outgoing line side voltage appraisal standards UT1～UT2, and main transformer high-pressure side power factorMeet transforming plant lead-in side
Power factor standardPower distribution network is unsatisfactory for voltage appraisal standards, i.e. power distribution network all 10kV branch line head end and end institute
At distribution transforming and the low-pressure side voltage U that is provided with the place distribution transforming of low-pressure reactive compensation equipmentziMeet the single-phase confession of 220V of distribution low-voltage side
Piezoelectric voltage appraisal standards Up1～Up2Qualification rate less than 90%.
The 3. to plant situation be that transformer station is unsatisfactory for voltage power-less appraisal standards, i.e. main transformer low-pressure side voltage UlIt is unsatisfactory for becoming
Power station outgoing line side voltage appraisal standards UT1～UT2, or main transformer high-pressure side power factorIt is unsatisfactory for transformer station
Inlet wire side power factor standardPower distribution network meets voltage appraisal standards, i.e. power distribution network all 10kV branch line head end and end
Place distribution transforming and be provided with the low-pressure side voltage U of low-pressure reactive compensation equipment place distribution transformingziMeet distribution low-voltage side 220V single-phase
Supply voltage appraisal standards Up1～Up2Qualification rate reach more than 90%.
The 4. to plant situation be that transformer station is unsatisfactory for voltage power-less appraisal standards, i.e. main transformer low-pressure side voltage UlIt is unsatisfactory for becoming
Power station outgoing line side voltage appraisal standards UT1～UT2, or main transformer high-pressure side power factorIt is unsatisfactory for transformer station
Inlet wire side power factor standardPower distribution network is unsatisfactory for voltage appraisal standards, i.e. power distribution network all 10kV branch line head end and end
Hold place distribution transforming and the low-pressure side voltage U of low-pressure reactive compensation equipment place distribution transforming is installedziMeet distribution low-voltage side 220V mono-
Phase supply voltage appraisal standards Up1～Up2Qualification rate less than 90%.
Concrete analysis judges that flow process is as shown in Figure 1.
Step (4): take station accordingly to join coordination control strategy according to examination assessment result.
After step (3) completes, take to stand accordingly according to transformer station and subordinate's power distribution network respective examination assessment result thereof
Join coordination control strategy.First according to the flow state under history typical load level, power distribution network is carried out subregion, it then follows with bar
Upper reactive power compensator is that between regional center, region, feeder line is divided into j region by the minimum principle of reactive power flowing, passes through
Flow state under typical load level is the reactive requirement proportionality coefficient α in each region in calculating feeder linej.The most idle by feeder line
Demand Qai=(Qgi+Qcpi+Qcli) calculate reactive power demand Q in each regionaj-Need, computing formula is as follows:
Qaj-Need=Qa×αj；
Wherein: Qaj-NeedFor the reactive power demand in each region, QaReactive power power Q for feeder line critical pointgWith in feeder line
Reactive-load compensation equipment puts into power (Qcpt+Qclr) sum, αjReactive requirement proportionality coefficient for region each in feeder line.
Concrete control strategy is as follows:
Step 4.1): for step 3.2) the 1. plant the control strategy that situation is taked.
In the case of Gai, transformer station meets voltage power-less appraisal standards, and power distribution network meets voltage appraisal standards.
First pass through formula Qaj-Need=Qa×αjReactive power demand Q in each region in calculating feeder lineaj-Need, then press
Throw according to injecting the idle order descending to the sensitivity coefficient of network loss at reactive-load compensation equipment position in feeder line
Enter, or ascending order is excised.On the premise of meeting the voltage power-less check requirements of transformer station and power distribution network, to the greatest extent
The reactive power demand in each region in may meeting feeder line, the purpose reaching to reduce distribution network loss further with this.
Step 4.2): for step 3.2) the 2. plant the control strategy that situation is taked.
In the case of Gai, transformer station meets voltage power-less appraisal standards, and power distribution network is unsatisfactory for voltage appraisal standards.
First pass through formula Qaj-Need=Qa×αjReactive power demand Q in each region in calculating feeder lineaj-Need.If feedback
In line, reactive-load compensation equipment has regulation nargin, then in calculating feeder line according to historical trend information, low-pressure reactive compensation equipment institute is in place
Put place and inject idle to the sensitivity coefficient of voltage at actual measurement distribution transforming:
SQU=Δ Uti/ΔQt；
Wherein: SQUFor imax×tmaxThe injection of scale is idle to voltage sensibility matrix, Δ QtIdle for distribution low-voltage side
Single pool-size of compensation device, Δ UtiFor putting into Δ QtVoltage change at rear actual measurement distribution transforming.
Voltage U by actual measurement distribution transformingzi, find out-of-limit UziThe distribution transforming that middle minima (or maximum) is corresponding, according to each district
Reactive power demand Q in territoryaj-Need, idle to the sensitivity system of voltage at this distribution transforming according to injecting at low-pressure reactive compensation equipment
Number SQUDescending order puts into reactive-load compensation equipment in (or excision) distribution, farthest to meet distribution low-voltage side
Voltage check requirements.In ensureing transformer station, voltage power-less meets its check requirements all the time simultaneously.
After distribution network var compensation equipment carries out switching, if the low-pressure side voltage of a large amount of distribution transforming still gets over lower limit, the most suitably
Raise main transformer tap gear and make main transformer low-pressure side voltage UlRaise；If the low-pressure side Over High-Limit Voltage of a large amount of distribution transformings, then fit
Main transformer low-pressure side voltage U is made when lowering main transformer tap gearlReduce.Main transformer voltage to be ensured during transformer station's regulation
Idle meet check requirements.Its concrete control strategy is as shown in Figure 2.
Step 4.3) for step 3.2) the 3. plant the control strategy that situation is taked.
In the case of Gai, transformer station be unsatisfactory for voltage power-less appraisal standards, and power distribution network meets voltage appraisal standards.
When transformer station is unsatisfactory for voltage power-less appraisal standards, carry out in detail with the running status that transformer station's nine-zone diagram is different
Explanation.Transformer station's nine-area control is as shown in Figure 3.
When " 1 " region during main transformer runs on Fig. 3, main transformer Over High-Limit Voltage and idle without out-of-limit situation.First master is adjusted
Variation joint gear is to reach the purpose of blood pressure lowering.If now main transformer outgoing line side current path is to normal range, then proceed to step
4.1) control strategy；If now main transformer low-pressure side voltage still gets over the upper limit, then reactive-load compensation equipment in suitably excision is stood.If stood
Interior voltage power-less regulating measure is used up and interior voltage of standing still gets over the upper limit, then consider the coordination control of distribution network var compensation equipment
System.Suitably inject the reactive power compensator of the idle bigger position of sensitivity to main transformer low-pressure side voltage in excision distribution, with
Time ensure that power distribution network meets voltage check requirements.Its concrete control strategy is as shown in Figure 4.
When " 5 " region during main transformer runs on Fig. 3, main transformer voltage gets over lower limit and idle without out-of-limit situation.First master is adjusted
Variation joint gear is to reach the purpose of boosting.If now main transformer outgoing line side current path is to normal range, then proceed to step
4.1) control strategy；If now main transformer low-pressure side voltage still gets over lower limit, then suitably put into reactive-load compensation equipment in station.If stood
Interior voltage power-less regulating measure is used up and interior voltage of standing still gets over lower limit, then consider the coordination control of distribution network var compensation equipment
System.The reactive power compensator of the idle bigger position of sensitivity to main transformer low-pressure side voltage is injected in suitably putting into distribution, with
Time ensure that power distribution network meets voltage check requirements.Its concrete control strategy is as shown in Figure 4.
When " 3 " region during main transformer runs on Fig. 3, main transformer the is idle more upper limit and voltage is without out-of-limit situation.The most suitably throw
Inbound interior reactive-load compensation equipment, if main transformer high-pressure side is idle after regulation falls back to normal range, then proceeds to step 4.1) control
Strategy.In if stood, Reactive-power control means have been used up and the idle upper limit of still getting in main transformer high-pressure side, then consider distribution network var compensation
The coordination of equipment controls.The idle benefit of the idle bigger position of the sensitivity idle to feeder line critical point is injected in suitably putting into distribution
Repay device, ensure that power distribution network meets voltage check requirements simultaneously.Its concrete control strategy is as shown in Figure 5.
When " 7 " region during main transformer runs on Fig. 3, main transformer is idle more lower limit and voltage is without out-of-limit situation.The most suitably cut
Except reactive-load compensation equipment in station, if main transformer high-pressure side is idle after regulation falls back to normal range, then proceed to step 4.1) control
Strategy.In if stood, Reactive-power control means have been used up and the idle lower limit of still getting in main transformer high-pressure side, then consider distribution network var compensation
The coordination of equipment controls.Suitably inject the idle benefit of the idle bigger position of the sensitivity idle to feeder line critical point in excision distribution
Repay device, ensure that power distribution network meets voltage check requirements simultaneously.Its concrete control strategy is as shown in Figure 5.
When " 2 " region during main transformer runs on Fig. 3, main transformer voltage and idle simultaneously get over the upper limit.First main transformer tap is adjusted
First gear position to reduce main transformer low-pressure side voltage, treat voltage return in normal range, then in regulation station, inlet wire side is idle.If this
Time main transformer high-pressure side is idle falls back to normal range, then proceed to step 4.1) control strategy；If now main transformer high-pressure side is idle
Still get over the upper limit, the most suitably put into reactive-load compensation equipment in station.In if stood, voltage power-less regulating measure is used up and main transformer is high
Pressure side is idle still gets over the upper limit, then consider that the coordination of distribution network var compensation equipment controls.Inject idle in suitably putting into power distribution network
The reactive power compensator of position bigger to the sensitivity that feeder line critical point is idle, ensures that power distribution network meets voltage examination and wants simultaneously
Ask.Its concrete control strategy is as shown in Figure 6.
When " 6 " region during main transformer runs on Fig. 3, main transformer voltage and idle simultaneously get over lower limit.First main transformer tap is adjusted
First gear position to raise main transformer low-pressure side voltage, treat voltage return in normal range, then in regulation station, inlet wire side is idle.If this
Time main transformer high-pressure side is idle falls back to normal range, then proceed to step 4.1) control strategy；If now main transformer high-pressure side is idle
Still get over lower limit, reactive-load compensation equipment in the most suitably excision is stood.In if stood, voltage power-less regulating measure is used up and main transformer is high
Pressure side is idle still gets over lower limit, then consider that the coordination of distribution network var compensation equipment controls.Suitably inject idle in excision power distribution network
The reactive power compensator of position bigger to the sensitivity that feeder line critical point is idle, ensures that power distribution network meets voltage examination and wants simultaneously
Ask.Its concrete control strategy is as shown in Figure 6.
When " 4 " region during main transformer runs on Fig. 3, main transformer voltage gets over lower limit, and reactive power gets over the upper limit.The most suitably put into
Reactive-load compensation equipment in standing, if now main transformer high-pressure side is idle falls back to normal range, then detection main transformer low-pressure side voltage is
No normally, if main transformer outgoing line side voltage still get over lower limit, the most suitably regulation main transformer tap gear make voltage raise；If put into
The idle upper limit of still getting in main transformer high-pressure side after reactive-load compensation equipment in standing, then in station, voltage power-less regulation equipment cannot be adjusted again
Joint, it is considered to the coordination of distribution network var compensation equipment controls.Inject idle idle to feeder line critical point in suitably putting into power distribution network
The reactive power compensator of the bigger position of sensitivity, ensures that power distribution network meets voltage check requirements simultaneously.Its concrete control strategy
As shown in Figure 7.
When " 8 " region during main transformer runs on Fig. 3, main transformer Over High-Limit Voltage, reactive power gets over lower limit.The most suitably excise
Reactive-load compensation equipment in standing, if now main transformer high-pressure side is idle falls back to normal range, then detection main transformer low-pressure side voltage is
No normally, if main transformer outgoing line side voltage still get over the upper limit, the most suitably regulation main transformer tap gear make voltage reduce；If excision
The idle lower limit of still getting in main transformer high-pressure side after reactive-load compensation equipment in standing, then in station, voltage power-less regulation equipment cannot be adjusted again
Joint, it is considered to the coordination of distribution network var compensation equipment controls.Suitably inject idle idle to feeder line critical point in excision power distribution network
The reactive power compensator of the bigger position of sensitivity, ensures that power distribution network meets voltage check requirements simultaneously.Its concrete control strategy
As shown in Figure 7.
Step 4.4) for step 3.2) the 4. plant the control strategy that situation is taked.
In the case of Gai, transformer station be unsatisfactory for voltage power-less appraisal standards, and power distribution network is unsatisfactory for voltage appraisal standards.Regulation and control are abided by
The principle followed is, if transformer station and distribution are all unsatisfactory for voltage power-less check requirements, then first passes through electricity in regulation transformer station
Pressure reactive apparatus meets transforming plant voltage reactive check requirements, then meets power distribution network by regulation distribution network var compensation equipment
Voltage check requirements, if after above-mentioned regulation, transformer station or power distribution network are still unsatisfactory for check requirements, then carry out mutually coordinated
Control.
It is described in detail with the running status that transformer station's nine-zone diagram is different.Transformer station's nine-area control is as shown in Figure 3.
In main transformer runs on Fig. 3, in " 1 " region, and distribution, distribution low-voltage side voltage is unsatisfactory for voltage check requirements.First
First adjustment main transformer tap gear is to reach the purpose of blood pressure lowering, if now main transformer low-pressure side current path is to normal range, then
Proceed to step 4.2) control strategy；If now main transformer low-pressure side voltage still gets over the upper limit, then the suitably interior reactive-load compensation in excision station sets
Standby.If stood in voltage power-less regulating measure used up and main transformer low-pressure side voltage still get over the upper limit, the most on this basis to distribution
Net reactive-load compensation equipment is adjusted.By formula Qaj-Need=Qa×αjThe reactive power demand in each region in calculating feeder line
Qaj-NeedIf in feeder line, reactive-load compensation equipment has regulation nargin, then according to reactive power demand Qaj-Need, according to nothing in feeder line
It is idle descending to the sensitivity coefficient of voltage at minimum (the highest) distribution transforming voltage that merit compensates injection at equipment position
Order carries out putting into (excision), farthest to meet the voltage check requirements of distribution low-voltage side.If through above-mentioned regulation
After, power distribution network and transformer station are the most all unsatisfactory for check requirements, then terminate regulation process.If after above-mentioned regulation, power distribution network
Meet voltage check requirements and substation low-voltage side voltage still gets over the upper limit, then proceed to step 4.3) control strategy.It specifically controls
Strategy is as shown in Figure 8.
In main transformer runs on Fig. 3, in " 5 " region, and distribution, distribution low-voltage side voltage is unsatisfactory for voltage check requirements.First
First adjustment main transformer tap gear is to reach the purpose of boosting, if now main transformer low-pressure side current path is to normal range, then
Proceed to step 4.2) control strategy；If now main transformer low-pressure side voltage still gets over lower limit, then in suitably putting into station, reactive-load compensation sets
Standby.If stood in voltage power-less regulating measure used up and main transformer low-pressure side voltage still get over lower limit, the most on this basis to distribution
Net reactive-load compensation equipment is adjusted.By formula Qaj-Need=Qa×αjThe reactive power demand in each region in calculating feeder line
Qaj-NeedIf in feeder line, reactive-load compensation equipment has regulation nargin, then according to reactive power demand Qaj-Need, according to nothing in feeder line
It is idle descending to the sensitivity coefficient of voltage at minimum (the highest) distribution transforming voltage that merit compensates injection at equipment position
Order carries out putting into (excision), farthest to meet the voltage check requirements of distribution low-voltage side.If through above-mentioned regulation
After, power distribution network and transformer station are the most all unsatisfactory for check requirements, then terminate regulation process.If after above-mentioned regulation, power distribution network
Meet voltage check requirements and substation low-voltage side voltage still gets over lower limit, then proceed to step 4.3) control strategy.It specifically controls
Strategy is as shown in Figure 8.
In main transformer runs on Fig. 3, in " 3 " region, and distribution, distribution low-voltage side voltage is unsatisfactory for voltage check requirements.First
The most suitably put into reactive-load compensation equipment in station, if main transformer high-pressure side is idle after Tiao Jie falls back to normal range, then proceed to step
4.2) control strategy.If in transformer station, Reactive-power control means have been used up and the idle upper limit of still getting in main transformer high-pressure side, then at this base
On plinth, distribution network var compensation equipment is adjusted.By formula Qaj-Need=Qa×αjIn calculating feeder line, each region is real-time
Reactive requirement Qaj-NeedIf in feeder line, reactive-load compensation equipment has regulation nargin, then according to reactive power demand Qaj-Need, according to
In feeder line at reactive-load compensation equipment position inject idle to the sensitivity coefficient of voltage at minimum (the highest) distribution transforming voltage by
Carry out putting into (excision) to little order greatly, farthest to meet the voltage check requirements of distribution low-voltage side.If passed through
After above-mentioned regulation, power distribution network and transformer station are the most all unsatisfactory for check requirements, then terminate regulation process.If through above-mentioned regulation
After, power distribution network meets check requirements and the idle upper limit of still getting in transformer station high-pressure side, then proceed to step 4.3) control strategy.It is concrete
Control strategy is as shown in Figure 9.
In main transformer runs on Fig. 3, in " 7 " region, and distribution, distribution low-voltage side voltage is unsatisfactory for voltage check requirements.First
The most suitably reactive-load compensation equipment in excision station, if main transformer high-pressure side is idle after Tiao Jie falls back to normal range, then proceeds to step
4.2) control strategy.If in transformer station, Reactive-power control means have been used up and the idle lower limit of still getting in main transformer high-pressure side, then at this base
On plinth, distribution network var compensation equipment is adjusted.By formula Qaj-Need=Qa×αjIn calculating feeder line, each region is real-time
Reactive requirement Qaj-NeedIf in feeder line, reactive-load compensation equipment has regulation nargin, then according to reactive power demand Qaj-Need, according to
In feeder line at reactive-load compensation equipment position inject idle to the sensitivity coefficient of voltage at minimum (the highest) distribution transforming voltage by
Carry out putting into (excision) to little order greatly, farthest to meet the voltage check requirements of distribution low-voltage side.If passed through
After above-mentioned regulation, power distribution network and transformer station are the most all unsatisfactory for check requirements, then terminate regulation process.If through above-mentioned regulation
After, power distribution network meets check requirements and the idle lower limit of still getting in transformer station high-pressure side, then proceed to step 4.3) control strategy.It is concrete
Control strategy is as shown in Figure 9.
In main transformer runs on Fig. 3, in " 2 " region, and distribution, distribution low-voltage side voltage is unsatisfactory for voltage check requirements.First
First adjust main transformer tap gear to reduce main transformer low-pressure side voltage, treat voltage return in normal range, in ability regulation station
Reactive-load compensation equipment.If now main transformer high-pressure side is idle falls back to normal range, then proceed to step 4.2) control strategy；If
Now the idle upper limit of still getting in main transformer high-pressure side, the most suitably puts into reactive-load compensation equipment in station.If voltage power-less in transformer station
Regulating measure has been used up and transformer station is still unsatisfactory for check requirements, adjusts distribution network var compensation equipment the most on this basis
Joint.By formula Qaj-Need=Qa×αjReactive power demand Q in each region in calculating feeder lineaj-NeedIf, idle benefit in feeder line
The equipment of repaying has regulation nargin, then according to reactive power demand Qaj-Need, note according at reactive-load compensation equipment position in feeder line
Enter the idle order descending to the sensitivity coefficient of voltage at minimum (the highest) distribution transforming voltage and put into (excision), with
Big degree ground meets the voltage check requirements of distribution low-voltage side.If after above-mentioned regulation, power distribution network and transformer station are the most not
Meet check requirements, then terminate regulation process.If after above-mentioned regulation, power distribution network meet check requirements and transformer station the most not
Meet check requirements, then proceed to step 4.3) control strategy.Its concrete control strategy is as shown in Figure 10.
In main transformer runs on Fig. 3, in " 6 " region, and distribution, distribution low-voltage side voltage is unsatisfactory for voltage check requirements.First
First adjust main transformer tap gear to raise main transformer low-pressure side voltage, treat voltage return in normal range, in ability regulation station
Reactive-load compensation equipment.If now main transformer high-pressure side is idle falls back to normal range, then proceed to step 4.2) control strategy；If
Now main transformer high-pressure side is idle still gets over lower limit, reactive-load compensation equipment in the most suitably excision is stood.If voltage power-less in transformer station
Regulating measure has been used up and transformer station is still unsatisfactory for check requirements, adjusts distribution network var compensation equipment the most on this basis
Joint.By formula Qaj-Need=Qa×αjReactive power demand Q in each region in calculating feeder lineaj-NeedIf, idle benefit in feeder line
The equipment of repaying has regulation nargin, then according to reactive power demand Qaj-Need, note according at reactive-load compensation equipment position in feeder line
Enter the idle order descending to the sensitivity coefficient of voltage at minimum (the highest) distribution transforming voltage and put into (excision), with
Big degree ground meets the voltage check requirements of distribution low-voltage side.If after above-mentioned regulation, power distribution network and transformer station are the most not
Meet check requirements, then terminate regulation process.If after above-mentioned regulation, power distribution network meet check requirements and transformer station the most not
Meet check requirements, then proceed to step 4.3) control strategy.Its concrete control strategy is as shown in Figure 10.
In main transformer runs on Fig. 3, in " 4 " region, and distribution, distribution low-voltage side voltage is unsatisfactory for voltage check requirements.First
The most suitably putting into reactive-load compensation equipment in station, if now main transformer high-pressure side is idle falls back to normal range, then detection main transformer is low
Pressure side voltage is the most normal, if main transformer outgoing line side voltage still gets over lower limit, then regulation main transformer tap gear makes voltage raise, warp
If transformer station meets voltage power-less check requirements after overregulating, then proceed to step 4.2) control strategy；If put in station
The idle upper limit of still getting in main transformer high-pressure side after reactive-load compensation equipment, then in transformer station, voltage power-less regulation equipment cannot be adjusted again
Joint.If in transformer station, voltage power-less regulating measure has been used up and transformer station is still unsatisfactory for check requirements, the most right
Distribution network var compensation equipment is adjusted.By formula Qaj-Need=Qa×αjIn calculating feeder line, the reactive power in each region needs
Seek Qaj-NeedIf in feeder line, reactive-load compensation equipment has regulation nargin, then according to reactive power demand Qaj-Need, according in feeder line
Inject idle descending to the sensitivity coefficient of voltage at minimum (the highest) distribution transforming voltage at reactive-load compensation equipment position
Order carry out putting into (excision), farthest to meet the voltage check requirements of distribution low-voltage side.If through above-mentioned tune
After joint, power distribution network and transformer station are the most all unsatisfactory for check requirements, then terminate regulation process；If after above-mentioned regulation, distribution
Net meets check requirements and transformer station is still unsatisfactory for check requirements, then proceed to step 4.3) control strategy.Its concrete control strategy
As shown in figure 11.
In main transformer runs on Fig. 3, in " 8 " region, and distribution, distribution low-voltage side voltage is unsatisfactory for voltage check requirements.First
The most suitably reactive-load compensation equipment in excision station, if now main transformer high-pressure side is idle falls back to normal range, then detection main transformer is low
Pressure side voltage is the most normal, if main transformer outgoing line side voltage still gets over the upper limit, then regulation main transformer tap gear makes voltage reduce, warp
If transformer station meets voltage power-less check requirements after overregulating, then proceed to step 4.2) control strategy；If in excision station
The idle lower limit of still getting in main transformer high-pressure side after reactive-load compensation equipment, then in transformer station, voltage power-less regulation equipment cannot be adjusted again
Joint.If in transformer station, voltage power-less regulating measure has been used up and transformer station is still unsatisfactory for check requirements, the most right
Distribution network var compensation equipment is adjusted.By formula Qaj-Need=Qa×αjIn calculating feeder line, the reactive power in each region needs
Seek Qaj-NeedIf in feeder line, reactive-load compensation equipment has regulation nargin, then according to reactive power demand Qaj-Need, according in feeder line
Inject idle descending to the sensitivity coefficient of voltage at minimum (the highest) distribution transforming voltage at reactive-load compensation equipment position
Order carry out putting into (excision), farthest to meet the voltage check requirements of distribution low-voltage side.If through above-mentioned tune
After joint, power distribution network and transformer station are the most all unsatisfactory for check requirements, then terminate regulation process；If after above-mentioned regulation, distribution
Net meets check requirements and transformer station is still unsatisfactory for check requirements, then proceed to step 4.3) control strategy.Its concrete control strategy
As shown in figure 11.
Embodiment
The transformer station in China X area and its subordinate's power distribution network carry out station and join specifically comprising the following steps that of coordination control
Step 1), determine according to daily load curve station join coordination control the moment.
Initially with load curve fusion method, transformer station's outgoing line side reactive power daily load curve is carried out segmentation, according to
Transforming plant main transformer tap gear action frequency every day is limited to x=10 time, and daily load curve is divided into x=10 section.If during m
The equivalent reactive power of section system is Qm, then adjacent time interval m and m+1 load variations amount absolute value are:
ΔQm=| Qm-Qm+1|；
Wherein: Δ QmFor adjacent time interval m and m+1 load or burden without work variable quantity absolute value, QmIt it is the equivalence nothing of m period system
Merit power, Qm+1It it is the equivalent reactive power of m+1 period system.
Find Δ QmQ time minimummThe corresponding period, period m and m+1 is merged into a new period m, with former period m
The load level of initial time characterizes the load level of new period after merging.Repeat merging process, until remaining fixed number
Till reaching expected numbers x=10.As shown in figure 12, in figure, daily load curve 1 is to bear original day to the segmentation result of daily load curve
Lotus curve, in figure, daily load curve 2 is the daily load curve after merging.After having merged, using the initial time of day part as
Station is joined coordination and is controlled the moment.Station join coordination control the moment be t=[0,4,7,11,12,17,18,19,21,22] point.
Step 2), Real-time Collection transformer station and the status information of subordinate's power distribution network thereof.
Step 1) complete after, according to the control moment determined, transformer station and subordinate's power distribution network thereof carried out station and join coordination control
System, carries out station as a example by the t=17 point moment and joins coordination control.By wide area measurement information system, Real-time Collection transformer station and
The voltage power-less status information of equipment component in subordinate's power distribution network, joins including power distribution network all 10kV branch line head end and end place
Become and be provided with the low-pressure side information of voltage U of low-pressure reactive compensation equipment place distribution transformingzi(i=1,2 ..., 54), feeder line critical point
Meritorious Pg=4.79MW, idle Qg=1.55Mvar information, main transformer low-pressure side and on high-tension side voltage Ul=10.35kV and Uh
=109.56kV, active-power Pl=23.20MW and Ph=23.28MW, reactive power Ql=5.46Mvar and Qh=
7.30Mvar；And the switching status information of control equipment, including the input capacity Qc of distribution low-voltage side reactive power compensatorpt(t
=1,2 ..., 23), the input capacity Qc of reactive power compensation system devicelr(r=1,2), main transformer tap gear D=10, transformer station
The input capacity Qc of reactive power compensatorT=600kvar.
Step 3), judge whether transformer station and subordinate's power distribution network thereof meet voltage power-less appraisal standards.
Step 2) complete after, according to step 2) the voltage power-less status data of Real-time Collection, it is judged that transformer station and subordinate thereof
Whether power distribution network meets respective voltage power-less appraisal standards, specifically comprises the following steps that
Step 3.1), input transformer station and the voltage power-less appraisal standards of power distribution network.
Input transformer station outgoing line side voltage appraisal standards UT1～UT2(UT1=10.0kV, UT2=10.7kV)；Input transformer station enters
Line side power factor standardIncluding peak hours power factor appraisal standards
Power factor appraisal standards during low ebb loadInput distribution low-voltage side 220V single phase power supply electricity
Pressure appraisal standards Up1～Up2(Up1=198V, Up2=235.4V).
Step 3.2) judge whether transformer station and power distribution network meet voltage power-less appraisal standards.
Step 3.1) complete after, judge that whether it meet each according to the voltage power-less status information of transformer station and power distribution network
Appraisal standards, be divided into following four situation:
The 1. to plant situation be that transformer station meets voltage power-less appraisal standards, i.e. main transformer low-pressure side voltage UlMeet transformer station
Outgoing line side voltage appraisal standards UT1～UT2(UT1=10.0kV, UT2=10.7kV), and main transformer high-pressure side power factorMeet transforming plant lead-in side power factor standardPower distribution network meets
Voltage appraisal standards, i.e. power distribution network all 10kV branch line head end and the distribution transforming of end place and low-pressure reactive compensation equipment institute is installed
Low-pressure side voltage U in distribution transformingzi(i=1,2 ..., 54) meet distribution low-voltage side 220V single phase power supply voltage appraisal standards Up1~
Up2(Up1=198V, Up2=235.4V) qualification rate reach more than 90%.
The 2. to plant situation be that transformer station meets voltage power-less appraisal standards, i.e. main transformer low-pressure side voltage UlMeet transformer station
Outgoing line side voltage appraisal standards UT1～UT2(UT1=10.0kV, UT2=10.7kV), and main transformer high-pressure side power factorMeet transforming plant lead-in side power factor standardPower distribution network is unsatisfactory for
Voltage appraisal standards, i.e. power distribution network all 10kV branch line head end and the distribution transforming of end place and low-pressure reactive compensation equipment institute is installed
Low-pressure side voltage U in distribution transformingzi(i=1,2 ..., 54) meet distribution low-voltage side 220V single phase power supply voltage appraisal standards Up1~
Up2(Up1=198V, Up2=235.4V) qualification rate less than 90%.
The 3. to plant situation be that transformer station is unsatisfactory for voltage power-less appraisal standards, i.e. main transformer low-pressure side voltage UlIt is unsatisfactory for becoming
Power station outgoing line side voltage appraisal standards UT1～UT2(UT1=10.0kV, UT2=10.7kV), or main transformer high-pressure side power factorIt is unsatisfactory for transforming plant lead-in side power factor standardPower distribution network meets
Voltage appraisal standards, i.e. power distribution network all 10kV branch line head end and the distribution transforming of end place and low-pressure reactive compensation equipment institute is installed
Low-pressure side voltage U in distribution transformingzi(i=1,2 ..., 54) meet distribution low-voltage side 220V single phase power supply voltage appraisal standards Up1~
Up2(Up1=198V, Up2=235.4V) qualification rate reach more than 90%.
The 4. to plant situation be that transformer station is unsatisfactory for voltage power-less appraisal standards, i.e. main transformer low-pressure side voltage UlIt is unsatisfactory for becoming
Power station outgoing line side voltage appraisal standards UT1～UT2(UT1=10.0kV, UT2=10.7kV), or main transformer high-pressure side power factorIt is unsatisfactory for transforming plant lead-in side power factor standardPower distribution network is discontented with
Afc voltage appraisal standards, i.e. power distribution network all 10kV branch line head end and the distribution transforming of end place and low-pressure reactive compensation equipment is installed
The low-pressure side voltage U of place distribution transformingzi(i=1,2 ..., 54) meet distribution low-voltage side 220V single phase power supply voltage appraisal standards Up1
～Up2(Up1=198V, Up2=235.4V) qualification rate less than 90%.
Judged result: transformer station meets voltage power-less appraisal standards (Ul=10.35kV meets at UT1～UT2Between,MeetBetween), power distribution network is unsatisfactory for voltage appraisal standards (Uzi(i=1,2 ..., 54) meet at Up1~
Up2Rate of qualified voltage be 59.26%, less than 90%), belong to and 2. plant situation.
Step 4), according to examination assessment result take station accordingly to join coordination control strategy.
Step 3) complete after, according to the of transformer station and its subordinate's power distribution network respective examination assessment result (step 3.2)
2. situation is planted) take station accordingly to join the control strategy of coordination control strategy (step 4.2)).First according to history typical load
Power distribution network is carried out subregion by the flow state under level, it then follows on bar reactive power compensator as regional center, between region nothing
Feeder line is divided into j (=3) individual region by the minimum principle of merit flow of power, is calculated by the flow state under typical load level
The reactive requirement proportionality coefficient α in each region in feeder linej(α1=0.509, α2=0.301, α3=0.190).Concrete control strategy is such as
Under:
In the case of Gai, transformer station meets voltage power-less appraisal standards, and power distribution network is unsatisfactory for voltage appraisal standards.
It is first according to formula Qaj-Need=Qa×αjReactive power demand Q in each region in calculating feeder lineaj-Need, calculate knot
Fruit is: Qa=2150kvar, Qa1-Need=1094kvar, Qa2-Need=647kvar, Qa3-Need=409kvar.
If in feeder line, reactive-load compensation equipment has regulation nargin, then according to low-voltage reactive power in historical trend information calculating feeder line
Inject idle to the sensitivity coefficient of voltage: S at actual measurement distribution transforming at compensation equipment positionQU=Δ Uti/ΔQt；
Wherein, SQUFor imax×tmaxScale (i=1,2 ..., 54；T=1,2 ..., 23) injection idle to pressure sensitive
Degree matrix, Δ Qt(t=1,2 ..., 23) it is single pool-size of distribution low-voltage side reactive power compensator, Δ Uti(i=1,2 ...,
54) for putting into Δ QtVoltage change at rear actual measurement distribution transforming.
Voltage U by actual measurement distribution transformingzi(i=1,2 ..., 54), find out-of-limit UziMiddle minima (or maximum) is corresponding
Distribution transforming, according to reactive power demand Q in each regionaj-Need(j=1,2,3), according to injecting nothing at low-pressure reactive compensation equipment
Merit is to the sensitivity coefficient S of voltage at this distribution transformingQUDescending order puts into reactive-load compensation equipment in (or excision) distribution, with
Farthest meet the voltage check requirements of distribution low-voltage side.In ensureing transformer station, voltage power-less meets its examination all the time simultaneously
Requirement.
In input distribution after reactive-load compensation equipment, result of calculation is: Ul=10.39kV,Uzi(i=1,
2 ..., 54) meet Up1～Up2Rate of qualified voltage be 79.63%.
After distribution network var compensation equipment carries out switching, if the low-pressure side voltage of a large amount of distribution transforming still gets over lower limit, the most suitably
Raise main transformer tap gear and make main transformer low-pressure side voltage UlRaise；If the low-pressure side Over High-Limit Voltage of a large amount of distribution transformings, then fit
Main transformer low-pressure side voltage U is made when lowering main transformer tap gearlReduce.Main transformer voltage to be ensured during transformer station's regulation
Idle meet check requirements.
Owing to the low-pressure side voltage of distribution transformings a large amount of in now distribution gets over lower limit, after main transformer tap gear is raised 2 grades
Result of calculation is: Ul=10.67kV,Uzi(i=1,2 ..., 54) meet Up1～Up2Rate of qualified voltage be
94.44%.Now transformer station and its subordinate's power distribution network are satisfied by voltage power-less check requirements, and station is joined coordination and controlled to terminate.
Test effect
Embodiment is designed following simulation example, the effectiveness of checking the inventive method.
Typical load day in embodiment in 17 moment are carried out after station joins coordination control, its original running status and control
Rear running status comparing result is as shown in the table:
Table 1: China X area typical load day, coordination control effect was joined at 17 moment stations
Typical load day in embodiment is carried out station join coordination control after, its original running status with control after run shape
State comparing result is as shown in the table:
Table 2: typical load day station, China X area is joined coordination and controlled effect
Knowable to experimental result:
The present invention can improve transformer station's outgoing line side rate of qualified voltage and inlet wire side power factor qualification rate largely,
Enable transformer station to meet its voltage power-less check requirements as far as possible；Distribution low-voltage side in power distribution network can be improved largely
Rate of qualified voltage, and the line loss of power distribution network can be greatly lowered, bring huge economic benefit and social benefit；Consider change
In power station, action frequency every day of main transformer tap gear limits, it is possible to ensure to meet in every day, action frequency limits to become as far as possible
Power station and the voltage power-less check requirements of its subordinate's power distribution network；
The inventive method only gathers the voltage power-less status information of equipment component in power distribution network, by Calculation of Sensitivity with regard to energy
Enough judge transformer station and the running status of power distribution network exactly and control accordingly, Real-time Collection and the data volume of computing
Little, calculate speed fast, gather and to control the installation cost of equipment less with operation expense, practical, it is simple to promote and answer
With.
Above-described embodiment is intended merely to the present invention is described, and is not used as limitation of the invention.As long as according to this
Bright technical spirit, be changed above-described embodiment, modification etc. all will fall in the range of the claim of the present invention.
Claims (8)
1. the voltage power-less distributed control method of coordination is joined at a station, it is characterised in that first, by wide area measurement information system
The voltage power-less status information of reactive-load compensation equipment in system Real-time Collection transformer station and subordinate's power distribution network thereof, controls reactive-load compensation and sets
Standby switching status information；Then, transformer station and power distribution network are judged according to the voltage power-less status information of transformer station Yu power distribution network
Meet the check requirements preset the most respectively；Finally, the station preset is performed according to the examination assessment result of transformer station with power distribution network
Join coordination control strategy；
Transformer station includes with the examination assessment result of power distribution network:
Transformer station meets voltage power-less appraisal standards, and power distribution network meets voltage appraisal standards；
Transformer station meets voltage power-less appraisal standards, and power distribution network is unsatisfactory for voltage appraisal standards；
Transformer station is unsatisfactory for voltage power-less appraisal standards, and power distribution network meets voltage appraisal standards；
Transformer station is unsatisfactory for voltage power-less appraisal standards, and power distribution network is unsatisfactory for voltage appraisal standards；
When transformer station is unsatisfactory for voltage power-less appraisal standards, and power distribution network is unsatisfactory for voltage appraisal standards, the principle that regulation and control are followed
It is: in first passing through regulation transformer station, voltage power-less equipment meets transforming plant voltage reactive check requirements, is then joined by regulation
In electrical network, reactive-load compensation equipment meets distribution network voltage check requirements, if transformer station or power distribution network are still unsatisfactory for check requirements,
Then carry out mutually coordinated control.
The voltage power-less distributed control method of coordination is joined at station the most according to claim 1, it is characterised in that first, logical
In overregulating transformer station, voltage power-less equipment meets transforming plant voltage reactive check requirements；Then, perform transformer station and meet voltage
Idle appraisal standards, power distribution network is unsatisfactory for control strategy during voltage appraisal standards；If voltage power-less equipment is again in transformer station
The secondary transforming plant voltage reactive check requirements that is unsatisfactory for, then the reactive power demand in each region in calculating feeder line, if nothing in feeder line
Merit compensates equipment regulation nargin, then according to reactive power demand, inject according at reactive power compensator position in feeder line
The idle order descending to the sensitivity coefficient of voltage at minimum or the highest distribution transforming voltage puts into or excises, and meets and joins
The voltage check requirements of low pressure side；If after above-mentioned regulation, power distribution network meets voltage appraisal standards, and transformer station is discontented with
Appraisal standards that afc voltage is idle, then perform power distribution network and meet voltage appraisal standards, and transformer station is unsatisfactory for voltage power-less appraisal standards
Control strategy, otherwise, terminate regulation process.
The voltage power-less distributed control method of coordination is joined at station the most according to claim 2, it is characterised in that work as transformer station
Meet voltage power-less appraisal standards, when power distribution network is unsatisfactory for voltage appraisal standards, the first real-time nothing in each region in calculating feeder line
Merit demand；
If reactive-load compensation equipment has regulation nargin in feeder line, then according to historical trend information, in calculating feeder line, low-voltage reactive power is mended
Repaying injection at equipment position idle to the sensitivity coefficient of voltage at actual measurement distribution transforming, the detection all 10kV of power distribution network prop up in real time
Line head end and the distribution transforming of end place and be provided with the low-pressure side voltage of low-voltage reactive compensator place distribution transforming, find out-of-limit joining
Minima or distribution transforming corresponding to maximum in the low-pressure side voltage become, according to the reactive power demand in region each in feeder line, according to
Injecting idle to the sensitivity coefficient of voltage at this distribution transforming at low-pressure reactive compensation equipment, descending order puts into,
Or ascending order excises；In distribution, reactive-load compensation equipment meets the voltage check requirements of distribution low-voltage side, simultaneously
In transformer station, voltage power-less meets check requirements all the time.
The voltage power-less distributed control method of coordination is joined at station the most according to claim 2, it is characterised in that work as transformer station
Being unsatisfactory for voltage power-less appraisal standards, when power distribution network meets voltage appraisal standards, the main transformer outgoing line side voltage of transformer station is interior with station
Situation and control strategy that inlet wire side is idle are as follows:
When main transformer outgoing line side Over High-Limit Voltage or more lower limit, and in standing, the idle nothing in inlet wire side the most in limited time, first adjusts main transformer outlet
Side voltage is to normal range, otherwise, excises or put into reactive-load compensation equipment in station；In if stood, voltage power-less regulating measure is used
The main transformer outgoing line side voltage the most more upper limit or more lower limit to the greatest extent, then reactive power compensator in regulation power distribution network, excises or puts into distribution
The reactive power compensator that interior injection is idle to the bigger position of sensitivity of main transformer low-pressure side voltage, ensures that power distribution network meets simultaneously
Voltage check requirements；
When main transformer outgoing line side voltage is without out-of-limit, and when the interior idle more upper limit in inlet wire side in station or more lower limit, first put into or excise station
The reactive power compensation of interior reactive-load compensation equipment, regulation main transformer high-pressure side is idle to normal range, if voltage power-less is adjusted in station
Joint means have been used up and the idle upper limit of still getting in main transformer high-pressure side, then reactive power compensator in regulation power distribution network, puts into or excise and join
Inject the reactive power compensator of the idle bigger position of the sensitivity idle to feeder line critical point in net, ensure that power distribution network meets simultaneously
Voltage check requirements；
When the idle the most more upper limit in inlet wire side or more lower limit in main transformer outgoing line side voltage with station, first adjustment main transformer outgoing line side voltage arrives
In normal range, then regulation station, inlet wire side is idle, if the idle the most more upper limit in main transformer high-pressure side or more lower limit, puts into or cuts
Except reactive-load compensation equipment in station, if voltage power-less regulating measure has been used up and the idle the most more upper limit in main transformer high-pressure side or more in station
Lower limit, then reactive power compensator in regulation power distribution network, put into or excise inject in distribution idle to idle sensitive in feeder line critical point
Spend the reactive power compensator of bigger position, ensure that power distribution network meets voltage check requirements simultaneously；
When main transformer outgoing line side voltage gets over lower limit, the idle more upper limit in inlet wire side in standing, or main transformer outgoing line side Over High-Limit Voltage, in standing
Inlet wire side is idle more lower limit time, first put into or excise the reactive power compensation of reactive-load compensation equipment in station, regulate main transformer high pressure
Side is idle to normal range, and detection main transformer low-pressure side voltage is the most normal, if main transformer outgoing line side voltage the most more lower limit or more go up
Limit, then adjust main transformer outgoing line side voltage to normal range；If put into or in excision station after reactive-load compensation equipment, main transformer high-pressure side
The idle the most more upper limit or more lower limit, in standing, voltage power-less regulation equipment cannot be adjusted again, then adjust distribution network var compensation
Device, injects the reactive-load compensation dress of the idle bigger position of the sensitivity idle to feeder line critical point in putting into or excise power distribution network
Put, ensure that power distribution network meets voltage check requirements simultaneously.
The voltage power-less distributed control method of coordination is joined at station the most according to claim 2, it is characterised in that work as transformer station
Meet voltage power-less appraisal standards, when power distribution network meets voltage appraisal standards, the first reactive power in each region in calculating feeder line
Demand, then according to inject the idle sensitivity coefficient to network loss in feeder line at reactive power compensator position, descending
Order put into, or ascending order is excised；Examine at the voltage power-less meeting transformer station and power distribution network and want
On the premise of asking, the reactive power demand in each region in simultaneously meeting feeder line, reduce distribution network loss.
The voltage power-less distributed control method of coordination is joined at station the most according to claim 1, it is characterised in that gather power transformation
Stand and in subordinate's power distribution network before the voltage power-less status information of reactive-load compensation equipment, determine that association is joined at station according to daily load curve
Regulate and control the moment processed, particularly as follows:
Initially with load curve fusion method, transformer station's outgoing line side reactive power daily load curve is carried out segmentation, according to power transformation
Station owner's variation joint gear action frequency every day is limited to x time, and daily load curve is divided into x section；The then equivalence of m period system
Reactive power is Qm, then adjacent time interval m and m+1 load variations amount absolute value are:
ΔQm=| Qm-Qm+1|；
Wherein, Δ QmFor adjacent time interval m and m+1 load or burden without work variable quantity absolute value, QmIt it is the idle merit of equivalence of m period system
Rate, Qm+1It it is the equivalent reactive power of m+1 period system；
By Δ QmQ time minimummCorresponding period m and m+1 merges into a new period m, bearing with former period m initial time
Lotus level characterizes the load level of new period m after merging；
Repeat merging process, until remaining fixed number reaches expected numbers x, after having merged, with each new period
Initial time is joined coordination as station and is controlled the moment.
The voltage power-less distributed control method of coordination is joined at station the most according to claim 6, it is characterised in that join according to station
The coordination control moment carries out station to transformer station and subordinate's power distribution network thereof and joins coordination control；By wide area measurement information system, in real time
The voltage power-less status information of equipment component in collection transformer station and subordinate's power distribution network thereof, including:
Power distribution network all 10kV branch line head end and the distribution transforming of end place and the low of low-voltage reactive compensator place distribution transforming is installed
Pressure side information of voltage Uzi；
The meritorious P at feeder line critical pointg, idle QgInformation；
Main transformer low-pressure side and on high-tension side voltage UlAnd Uh, active-power PlAnd Ph, reactive power QlAnd Qh；
The switching status information of control equipment, including the input capacity Qc of distribution low-voltage side reactive power compensatorpt, benefit that circuit is idle
Repay the input capacity Qc of devicelr, main transformer tap gear D, the input capacity Qc of Reactive Power Compensation Eqyuipment in SubstationT。
The voltage power-less distributed control method of coordination is joined at station the most according to claim 7, it is characterised in that judge power transformation
Stand and whether subordinate's power distribution network meets respective voltage power-less appraisal standards, specifically comprise the following steps that
1) input transformer station and the voltage power-less appraisal standards of power distribution network:
Input transformer station outgoing line side voltage appraisal standards UT1～UT2；Input transforming plant lead-in side power factor standardIncluding
Peak hours power factor appraisal standardsPower factor appraisal standards during low ebb loadInput distribution low-voltage
Side 220V single phase power supply voltage appraisal standards Up1～Up2；
2) judge whether transformer station and power distribution network meet voltage power-less appraisal standards:
Whether transformer station meets voltage power-less appraisal standards, particularly as follows: main transformer low-pressure side voltage UlWhether meet transformer station's outgoing line side
Voltage appraisal standards UT1～UT2, and main transformer high-pressure side power factorWhether meet transforming plant lead-in side merit
Rate factor standard
Whether power distribution network meets voltage appraisal standards, particularly as follows: power distribution network all 10kV branch line head end and the distribution transforming of end place and
The low-pressure side voltage U of low-voltage reactive compensator place distribution transforming is installedziWhether meet distribution low-voltage side 220V single phase power supply electricity
Pressure appraisal standards Up1～Up2Qualification rate reach more than 90%.
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| CN110783929B (en) * | 2019-11-20 | 2021-03-12 | 国网浙江省电力有限公司电力科学研究院 | Method for participating in power grid voltage control of reactive power compensation device of converter station after direct-current blocking |
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