CN102820661B - Overall voltage quality coordinated control method for distribution network being oriented to multi-level objects - Google Patents
Overall voltage quality coordinated control method for distribution network being oriented to multi-level objects Download PDFInfo
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Abstract
The invention relates to an overall voltage quality coordinated control method for a distribution network being oriented to multi-level objects, which comprises the following steps that A, a network structure of a county regulation system is subjected to real-time topology analysis, and is divided into a plurality of gateway areas according to the practical conditions, and each gateway area comprises a plurality of regulation units of a subordinate power grid; B, the location for each regulation unit in each gateway area to operate in an automatic voltage quality control (AVQC) improved nine-zone graph is determined, a regulation unit capacitor and transformer gear regulation strategy is formed, and furthermore, the optimum and suboptimum regulation schemes of the regulation units are formed; and C, each gateway area forms a combination coordination control scheme according to the regulation unit capacitor and transformer gear regulation strategy. The method adopts a layering and zoning voltage quality control strategy which is oriented to the multi-level objects, satisfies the voltage quality control requirements of the controlled region, also coordinates and meets the voltage quality control requirements of a superior power grid, the voltage quality coordinated control over the superior power grid and the subordinate power grid is realized, and the voltage quality operation level of the whole power grid is optimized.
Description
Technical field
The present invention relates to electric power system voltage and reactive power optimization field, be specifically related to a kind of distribution towards multi-object overall situation voltage and reactive power coordinated control method.
Background technology
In electric power system, quality of voltage is a very important safety indexes, idle work optimization is then the importance of the economical operation realizing electric power system, the key factor of the idle voltage levvl of supporting network especially, therefore in order to run with ensureing power system security, stable and high-quality, VQC voltage power-less regulates to receive and payes attention to widely.Voltage & var control mode in electric power system has three classes, the first kind is that transforming plant voltage reactive controls, comprise reactive power/voltage control, the transformer station reactive power automatic compensation device two kind of dispatch automated system based on nine-zone graph, only with the reactive voltage level in transformer station for basis for estimation regulates; Equations of The Second Kind is the idle control of region voltage, with Nanjing He Hai electric power softcom limited Regional Network Voltage/Var optimizing operation closed-loop control system for representative, adopts distributed Two-stage control; 3rd class is the Dynamic reactive power optimization in bulk power grid, changes the generator that is incorporated into the power networks to the idle supply of bulk power grid mainly through regulator generator excitation unit etc., dynamic optimization bulk power grid idle.Applying at present wider in power distribution network is the first kind and Equations of The Second Kind voltage & var control mode.
Scheduling is divided into Pyatyi according to the scope of scheduling by China's electric power system: state's tunes, network regulation, province adjust, be in harmonious proportion county and adjust (adjusting integrated future development to county at present), this dispatching method can realize dispatching the layering of electrical network easily.But electrical network is an entirety, for realizing the optimal control of operation of power networks, need joint coordination between the superior and the subordinate's electrical network to control, especially in voltage & var control field, such requirement is more obvious.Along with the extensive use at the scene of China's voltage & var control software, the voltage power-less joint coordination of the superior and the subordinate's electrical network controls the new demand becoming voltage & var control.Jointly controlled by the voltage and reactive power optimization between the superior and the subordinate's electrical network, the voltage & var control level of higher level's electrical network can be optimized, for subordinate's electrical network provides better quality of voltage.Subordinate's electrical network, on the basis of better voltage levvl, can reduce the action frequency of voltage & var control equipment, optimize the voltage & var control of self.So the voltage & var control between the superior and the subordinate's electrical network is mutually promoted, influence each other, the common quality of voltage improving electrical network, improves reactive power distribution.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of distribution towards multi-object overall situation voltage and reactive power coordinated control method, the method adopts the layering and zoning voltage & var control strategy towards Multistage Control target, meeting in region within the jurisdiction while voltage & var control requirement, coordinate and meet the voltage & var control requirement of higher level's electrical network, thus realize higher level's electrical network and the idle cooperation control of subordinate's line voltage, optimize the voltage power-less operation level of whole electrical network.
The object of the invention is to adopt following technical proposals to realize:
Towards a distribution overall situation voltage and reactive power coordinated control method for multi-object, its improvements are, described method comprises the steps:
A, real-time topology analysis is carried out to the network configuration of county's adjusting system, be divided into several according to actual conditions and close port area, respectively close in port area several regulation and control unit comprising subordinate's electrical network;
B, to determine in the port area of each pass that each regulation and control unit operates in AVQC and improves nine-zone graph, form capacitor switching and the transformer gear regulation strategy of regulation and control unit, and then form optimum and the suboptimum regulation scheme of regulation and control unit;
C, described each pass port area need to form regulation and control unit combination Coordinated Control Scheme according to overall voltage & var control.
Wherein, the three class control target that described method reaches when reactive voltage cooperation control comprises: close port area transformer substation voltage control objectives, critical point power factor controlling target and close idle control objectives in port area transformer station.
Wherein, in described pass port area transformer station, busbar voltage controls at the early warning upper limit and early warning lower limit that (regional dispatch quarterly issues the qualified index of voltage to county-level scheduling, the upper and lower limit of county-level scheduling each substation bus bar voltage of setting in this is interval and desirable upper limit value and lower limit value, the early warning upper limit is between the upper limit and ideal bound, generally get its median, early warning lower limit is between lower limit and desirable lower limit, equally generally get its median) between, described pass port area transformer substation voltage control objectives is the one-level control objectives of AVQC.
Wherein, the upper limit of described critical point power factor
and lower limit
be the Two-stage control target of AVQC.
Wherein, in described AVQC computational process, power factor specification is converted into reactive power index; When critical point reactive power is sent, critical point power factor is negative value, critical point power factor
with critical point reactive power Q with 1. following and 2. formula represent:
When critical point reactive power is not sent, critical point power factor is on the occasion of, critical point power factor
with critical point reactive power Q with 3. following and 4. formula represent:
According to critical point power factor higher limit
lower limit
and critical point active-power P obtains the higher limit Q of critical point reactive power
maxwith lower limit Q
max, critical point reactive power mean value and median are Q
mid.
Wherein, in described pass port area transformer station, idle control objectives is the three class control target of AVQC.
Wherein, in described step B, described improvement nine-zone graph comprises main throwing region, cuts region, for cutting region, waiting and cut region and six kinds, region of transferring the files for throwing region, master.
Wherein, described main throwing region is for preferentially to drop into capacitor area; Described standby region of throwing is that suboptimum drops into capacitor area; Described master cuts region for preferentially to excise capacitor area; Described standby region of cutting is suboptimum excision capacitor area; It is suboptimum excision capacitor area that described time cuts region; Described region of transferring the files is for adjustment transformer gear region.
Wherein, in described step C, described formation combination Coordinated Control Scheme comprises the steps:
1) transformer station's regulation and control unit excises capacitor operation by force;
2) perform combined capacitor to throw, cut strategy;
3) transformer gear regulation strategy is performed.
Wherein, in described step 1), to single transformer station regulation and control unit, its reactive power releasing capacity must not exceed prescribed limits (prescribed limits normally controls within 50% of regulation and control unit low-pressure end condenser capacity); Transformer station's regulation and control unit reactive power releasing being exceeded to prescribed limits performs the operation of excising capacitor by force.
Wherein, described step 2) in, perform combined capacitor regulation strategy and comprise the steps:
A, the combination seeking optimal case meet critical point power factor within the scope of bound;
If b step a cannot meet critical point power factor command, then perform the combination of optimal case-suboptimal design;
If c step b cannot meet the requirement of critical point power factor, in the port area of pass, choose an execution in all regulation and control unit schemes, make to regulate rear critical point reactive power Q closest to Q
mid.
Wherein, in described step 3), do not perform capacitor switching strategy and voltage performs the measure of corresponding ascending, descending shelves higher than early warning higher limit or lower than the regulation and control unit of early warning lower limit;
Follow the principle that the high higher level's transformer gear of electric pressure preferentially regulates when performing corresponding ascending, descending shelves measure: regulation and control unit performs the regulation strategy dropping into capacitor or transformer upshift when higher level transformer station, then the regulation and control unit that next stage transformer station is attached thereto does not produce transformer upshift strategy; When upper level transformer station regulation and control unit performs the regulation strategy of excision capacitor or transformer downshift, then the regulation and control unit that next stage transformer station is attached thereto does not produce transformer down-shift strategy.
Compared with the prior art, the beneficial effect that the present invention reaches is:
1, three hierarchical objectives that the present invention proposes, namely the qualified control of port area transformer substation voltage is closed, critical point power factor controlling, idle control in transformer station, every grade of control objectives is embodied as prerequisite all with control objectives before, more traditional VQC reactive voltage software, not only have of overall importance, meet the demand that the control of voltage power-less joint coordination is carried out in regional dispatch and county-level scheduling, meet the principle demand of the importance of the importance > local idle work optimization of the qualified importance > overall situation idle work optimization of line voltage simultaneously, every grade of control objectives is embodied as prerequisite all with control objectives before, ensure the grading control of control objectives.
2, the present invention has carried out secondary adjustment to the Region dividing improving nine-zone graph, improvement nine-zone graph is reclassified as six large class regions, namely main throwing region (preferentially dropping into capacitor area), standby throwing region (suboptimum input capacitor area), master cut region (preferentially excising capacitor area), for cutting region (suboptimum excision capacitor area), waiting and cut region (suboptimum excision capacitor area), region of transferring the files (only performing tactful region of transferring the files), define and newly improve nine-zone graph.This division principle not only considers the idle residing region of regulation and control cell voltage, more taken into consideration regulation and control cell capaciator switching and transformer gear regulate resource situation and to voltage, idle regulating effect, define the regulation scheme of Local Priority and local suboptimum, for voltage and reactive power optimization provides the foundation guarantee.
3, present invention employs for towards multiobject control method for coordinating, be embodied in the formation of combined strategy: first, transformer station promptly cuts by force capacitor and controls to be that the requirement of substation operation code preferentially performs; Secondly, in the formation of combined capacitor regulation strategy, the assembled scheme that substep real-time estimation is applicable to,, critical point power factor qualified by voltage meets for control objectives with the idle level in local simultaneously, cannot realize, the critical point power factor qualified with voltage of debasing the standard is control objectives, still cannot realize continuing to debase the standard only qualified in control objectives with voltage; Finally, perform combination to transfer the files strategy.This control method for coordinating can realize multiobject grading control, avoid the situation occurring providing combination coordination control strategy without meeting the existence of three class control target solution simultaneously, have and can be embodied as according to electrical network practical operation situation the advantage instructing and propose feasible program with the classification of target.
4, combined transformer gear regulation strategy of the present invention is the important component part of the qualified control of voltage, and adhere to that the layering of voltage regulates, higher level regulates preferentially, has and avoids the upper and lower two inter-stages advantage be added to that tells on of regulation measure in the same way.
5, to close in port area in all capacitor resource utilizations in raising, select in the process of combination cooperation control, by service time successively and amount of capacity two indexs, screening is in real time applicable to the capacitor resource of action, has the advantage that can make full use of all capacitor resources.
6, the difference setting of the reactive power releasing limit value (regulate and control unit reactive power releasing and exceed the operation that this limit value must enforce excision capacitor) of capacitor is excised by force by the reactive limit value (capacitor drops into rear regulation and control unit reactive power releasing capacity must not exceed this limit value) to regulation and control cell capaciator input and regulation and control unit, allow the fluctuation space that in transformer station, idle existence is certain, there is the advantage of the reforming phenomena of the continuous switching of capacitor avoided in station.
Accompanying drawing explanation
Fig. 1 is that AVQC(reactive Voltage Optimum provided by the invention controls automatically) critical point regional structure figure;
Fig. 2 is that AVQC provided by the invention newly improves nine-zone graph and territorial classification schematic diagram thereof;
Fig. 3 is AVQC control method for coordinating flow chart provided by the invention;
Fig. 4 is that AVQC provided by the invention combines the detailed diagram of Coordinated Control Scheme forming process.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
The present invention is the AVQC of overall voltage & var control, in line with the principle of layering and zoning, local compensation, dispatch with higher level and carry out voltage, idle cooperation control, under the prerequisite ensureing voltage levvl at different levels, the in-situ balancing that feasible region is idle, thus reduce network active loss, improve power consumption efficiency.As shown in Figure 3, the method comprises the steps: AVQC control method for coordinating flow process provided by the invention
A, real-time topology analysis is carried out to the network configuration of county's adjusting system, be divided into several close port area according to actual conditions, respectively close in port area several regulation and control unit comprising subordinate's electrical network;
The three class control target of AVQC:
Require that regional dispatch Department of Automation unifies county-level scheduling automated system realization to upper at present, the reactive voltage of subordinate's electrical network jointly controls, actual conditions are: in reactive power, higher level dispatches the related data of the Reactive-power control ability of exchange power and subordinate's electrical network that can only obtain between the electrical network of the two poles of the earth, in voltage levvl, higher level's scheduling cannot observe the voltage condition of subordinate's electrical network, cause, subordinate's dispatching patcher is in the process of cooperation control, on ground is adjusted and is only considered, subordinate's electrical network exchanges the restriction of power and forms reactive voltage real-time optimization guidance program, the voltage condition of subordinate's electrical network cannot be taken into account, and voltage levvl is the important indicator of electricity net safety stable, therefore subordinate's dispatch automated system must while cooperation higher level electrical network carries out power adjustments voltage levvl in active accommodation region, then just can be thought of as and reduce via net loss in region further and optimize local reactive power level in subordinate's Grid.
The regulating index for exchange power that higher level's electrical network issues provides with the form of power factor upper and lower limit, its reason is: concerning higher level's electrical network, when subordinate's power distribution network absorption active power is certain, reactive power consumption more at least power factor is higher, this not only achieves the support to higher level's voltage level of power grid, the difference of power factor between higher level's electrical network adjacent node can be reduced simultaneously, reduce the loss of higher level's grid power, thus contribute to the economical operation of higher level's electrical network.Required electric energy is directly supplied by higher level's electrical network completely; County adjusts subordinate's electrical network structure radially, critical point is set up at 35KV, 110KV outgoing line side of higher level's electrical network 220KV grade transformer substation, down topological respectively, separate some regions can be obtained, pass by name port area, circulate in the exchange power at critical point and the gross power of critical point region absorption, critical point regional structure figure as shown in Figure 1.
The invention provides the three class control target of subordinate's electrical network when realizing reactive voltage cooperation control with higher level's electrical network: region voltage level is as one-level control objectives, critical point, region power factor is as Two-stage control target, in the transformer station of region, reactive power is as three class control target, according to the principle of the importance of the importance > local idle work optimization of the overall idle work optimization of the importance > that line voltage is qualified, every grade of control objectives is embodied as prerequisite all with control objectives before, ensures the grading control of control objectives.
I, pass port area transformer substation voltage control objectives:
The voltage request closed in port area transformer station controls between the early warning upper limit and early warning lower limit, and this is also the one-level control objectives of AVQC.The early warning upper limit and early warning lower limit refer to regional dispatch and quarterly issue the qualified index of voltage to county-level scheduling, the upper and lower limit of county-level scheduling each substation bus bar voltage of setting in this is interval and desirable upper limit value and lower limit value, the early warning upper limit is between the upper limit and ideal bound, generally get its median, early warning lower limit, between lower limit and desirable lower limit, equally generally gets its median
II, critical point power factor controlling target:
The critical point power factor regulation upper limit that ground adjusts real time down to adjust to county
and lower limit
be the Two-stage control target of AVQC.In order to more directly utilize regulatable capacitor resource in region, power factor specification, in computational process, is converted into reactive power index by AVQC, and concrete mode is as follows:
Active power flows to subordinate's electrical network from higher level's electrical network, and reactive power is quite different, and power load characteristic is larger on its impact.Such as in actual distribution network, critical point reactive power was adjusted by ground and was flowed to county's tune peak period on daytime, may occur that critical point power factor is less than normal, the phenomenon that in electric power networks, voltage levvl is on the low side, need county's adjusting system to carry out reactive power compensation on the spot in time; And to evening, the reactive power at critical point flows to contrary, occur situation about sending, cause voltage levvl in electric power networks too high, need county's adjusting system to excise capacitor in time, assistance system is dissolved superfluous idle in time.Critical point power factor
the conversion mode of critical point reactive power Q and critical point active-power P, according to the difference of the idle flow direction in critical point, has certain difference.When critical point reactive power is sent, critical point power factor is negative value, critical point power factor
with critical point reactive power Q with 1. following and 2. formula represent:
When critical point reactive power is not sent, critical point power factor is on the occasion of, critical point power factor
with critical point reactive power Q with 3. following and 4. formula represent:
According to critical point power factor higher limit
lower limit
and critical point active-power P obtains the higher limit Q of critical point reactive power
maxwith lower limit Q
max, critical point reactive power mean value and median are Q
mid.
Idle control objectives in III, transformer station:
The optimum position that regulation and control unit [1] in the port area transformer station of pass is idle is in the centre position of improving nine-zone graph [1], because reactive power is in this region is, local loss minimization, this is also the third level control objectives of AVQC.
B, determine that each regulation and control unit in the port area of each pass operates in AVQC and improves position in nine-zone graph, form capacitor and the transformer gear regulation strategy of regulation and control unit, and then form optimum and the suboptimum regulation scheme of regulation and control unit;
(1) Region dividing of unit is regulated and controled in AVQC system:
The reactive voltage of AVQC regulates resource namely to close the capacitor throwing of all regulation and control unit in port area, cut the gear adjustment resource of resource and on-load tap-changing transformer.The present invention is on the Region dividing basis of improving nine-zone graph, take situation and the regulating effect thereof of regulation and control unit regulating resource into consideration, improved nine-zone graph and be reclassified as six large class regions, put forward newly to improve nine-zone graph, as shown in Figure 2, six large class regions comprise main throwing region, cut region, for cutting region, waiting and cut region and region of transferring the files for throwing region, master.Wherein, judge regulation and control unit whether have can drop into capacitor resource time, increase the setting of the reactive limit value (capacitor drops into rear regulation and control unit reactive power releasing capacity must not exceed this limit value) to regulation and control cell capaciator input, and and regulate and control reactive power releasing limit value (regulation and control unit reactive power releasing exceedes this limit value and must enforce the operation of the excising capacitor) difference to some extent that unit excises capacitor by force.The reactive limit value dropped into as regulated and controled cell capaciator is set to 40%, reactive power releasing is cut by force the upper limit and is set to 50%, so estimation drop into after using cause regulating and controlling unit reactive power releasing surpass 40% capacitor will not as dropping into capacitor resource, and the capacitor resource that be in input state will be excised by force when regulation and control unit reactive power releasing is more than 50%.The fluctuation space that in permission transformer station like this, idle existence is certain, can avoid the reforming phenomena occurring the continuous switching of station inner capacitor.
Main throwing region (preferentially dropping into capacitor area): 1st district in corresponding improvement nine-zone graph 2 and 2nd district.Wherein be in the regulation and control unit in 1st district, voltage is lower than early warning lower limit and absorb more idle, therefore dropping into capacitor is the optimum cell regulation scheme taking into account voltage order one control objectives and three grades of idle control objectives in local, and raising transformer gear is the suboptimum unit regulation scheme only meeting voltage order one control objectives; Be in the regulation and control unit in 2nd district, voltage is normal but absorb more idle, transformer can downshift, therefore downshifting after first dropping into capacitor is the optimum cell regulation scheme taking into account voltage order one control objectives and three grades of idle control objectives in local, does not regulate the normal level of ME for maintenance to be then the suboptimum unit regulation scheme only meeting voltage order one control objectives.
Standby throwing region (suboptimum input capacitor area): corresponding 3rd district improved in nine-zone graph 2.Be in the regulation and control unit in 3rd district, voltage power-less level is all in best region, there is the capacitor resource that can drop into, transformer can downshift, do not regulate ME for maintenance and idle normal level to be the optimum cell regulation schemes taking into account voltage order one control objectives and three grades of idle control objectives in local, downshifting after first dropping into capacitor, is the suboptimum unit regulation scheme only meeting voltage order one control objectives.
Master cuts region (preferentially excising capacitor area): corresponding 4th district improved in nine-zone graph 2.Be in the regulation and control unit in 4th district, voltage is higher than early warning higher limit and absorb less idle, therefore excising capacitor is the optimum cell regulation scheme taking into account voltage order one control objectives and three grades of idle control objectives in local, and reducing transformer gear is the suboptimum unit regulation scheme only meeting voltage order one control objectives.
For cutting region (suboptimum excision capacitor area): 5th district in corresponding improvement nine-zone graph 2 and 6th district.Be in the regulation and control unit in 5th district, voltage is normal, what absorb is idlely in normally in the scope not exceeding the reactive power releasing upper limit on the low side, have and can excise capacitor resource and transformer upshift resource, not regulating is the optimum cell regulation scheme taking into account voltage order one control objectives and three grades of idle control objectives in local, and after first cutting capacitor, upshift is the suboptimum unit regulation scheme only meeting voltage order one control objectives.Be in the regulation and control unit in 6th district, voltage is higher than early warning higher limit, the idle of absorption is in normal range (NR), have and can excise capacitor resource and transformer downshift resource, reducing gear is the optimum cell regulation scheme taking into account voltage order one control objectives and three grades of idle control objectives in local, and excision capacitor is the suboptimum unit regulation scheme only meeting voltage order one control objectives.
Time cuts region (suboptimum excision capacitor area): corresponding 3rd district improved in nine-zone graph 2.Be in the regulation and control unit in 3rd district, voltage is normal, the idle of absorption is also in normal range (NR), but there is resectable capacitor resource, transformer can upshift, therefore do not regulate ME for maintenance and idle normal level to be the optimum cell regulation schemes taking into account voltage order one control objectives and three grades of idle control objectives in local, upshifing after first excising capacitor, is the suboptimum unit regulation scheme only meeting voltage order one control objectives.
To transfer the files region (only perform transfer the files tactful region): corresponding 7,8,9 districts improved in nine-zone graph.The regulation and control cell voltage being in 7th district is higher, is idlely in normal range (NR), only carries out the operation of transformer downshift; The regulation and control cell voltage being in 8,9 districts is on the low side, idle higher, only carries out transformer upshift operation.
C, each port area of closing form combination Coordinated Control Scheme according to capacitor and transformer gear regulation strategy.
Combination Coordinated Control Scheme comprises 3 steps altogether, and the basis of guarantee safe operation of power system realizes three grades of goals of regulation and control.
AVQC combines the detailed diagram of Coordinated Control Scheme forming process as shown in Figure 4, in figure, Q is critical point reactive power estimated value, and Qmax, Qmin are respectively critical point reactive power and regulate the upper limit, lower limit, Qmid is the median of Qmax and Qmin, and q is the nominal reactive that can drop into, can excise capacitor; " main cut array " is to voltage, being idlely positioned at the regulation and control unit newly improving nine-zone graph " main cut region " in the port area of same pass, first by the successively sequence last operate time can excising capacitor, operate time last time, much the same size by measure sorted, all the other " standby cut array ", " time cuts array ", " main throwing array ", " standby throw array " sort method are identical, its regulation and control unit lays respectively at " standby cut region ", " time cuts region ", " main throwing region ", " standby throw region ".
1) capacitor control is promptly cut by force by transformer station: for single transformer station, its reactive power releasing capacity must not exceed prescribed limits, otherwise the safe and stable operation affecting transformer station does not meet substation operation code yet.Therefore, the transformer station's regulation and control unit exceeding regulation restriction for reactive power releasing performs and excises the operation of capacitor by force.
2) combined capacitor is thrown, is cut strategy: for satisfied three grades of goals of regulation and control, first forms combined capacitor regulation scheme.
A, seek the combination (consider voltage-region idle) of optimal case to meet critical point power factor within the scope of bound;
If b step a cannot meet critical point power factor command, then perform the combination that second step seeks optimal case (considering that voltage-region is idle)-suboptimal design (consideration voltage);
If c step b still cannot meet the requirement of critical point power factor, in all schemes, choose an execution, make to regulate rear critical point reactive power Q closest to Q
mid.
3) combined transformer gear regulation strategy: for meeting three class control target, continues to perform combined transformer gear regulation scheme.For meeting three class control target, continue to perform combined transformer gear regulation scheme.To the 2nd) after step, do not perform capacitor switching measure and voltage performs corresponding liter, by shelves measure higher than early warning higher limit or lower than the regulation and control unit of early warning lower limit.Period follows the principle that the high higher level's transformer gear of electric pressure preferentially regulates: when higher level transformer station, regulation and control unit performs the regulation measure dropping into capacitor or transformer upshift, then the regulation and control unit that next stage transformer station is attached thereto does not produce transformer upshift strategy; When upper level transformer station regulation and control unit performs the regulation measure of excision capacitor or transformer downshift, the regulation and control unit that then next stage transformer station is attached thereto does not produce transformer down-shift strategy, avoids the superposition that tells on of regulation measure in the same way of upper and lower two inter-stages with this.
The present invention is towards the distribution overall situation voltage and reactive power coordinated control method of multi-object, not only have of overall importance, the demand of voltage power-less joint coordination control is carried out in order to meet regional dispatch and county-level scheduling, meet the principle demand of the importance of the importance > local idle work optimization of the qualified importance > overall situation idle work optimization of line voltage simultaneously, three hierarchical objectives proposed, namely the qualified control of port area transformer substation voltage is closed, critical point power factor controlling, idle control in transformer station, every grade of control objectives is embodied as prerequisite all with control objectives before, ensure the grading control of control objectives.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although with reference to above-described embodiment to invention has been detailed description, those of ordinary skill in the field are to be understood that: still can modify to the specific embodiment of the present invention or equivalent replacement, and not departing from any amendment of spirit and scope of the invention or equivalent replacement, it all should be encompassed in the middle of right of the present invention.
Claims (5)
1., towards a distribution overall situation voltage and reactive power coordinated control method for multi-object, it is characterized in that, described method comprises the steps:
A, real-time topology analysis is carried out to the network configuration of county's adjusting system, be divided into several according to actual conditions and close port area, respectively close in port area several regulation and control unit comprising subordinate's electrical network;
B, determine that each regulation and control unit in the port area of each pass operates in AVQC and improves position in nine-zone graph, form capacitor switching and the transformer gear regulation strategy of regulation and control unit, and then form optimum and the suboptimum regulation scheme of regulation and control unit;
C, described each pass port area need to form regulation and control unit combination Coordinated Control Scheme according to overall voltage & var control;
The three class control target that described method reaches when reactive voltage cooperation control comprises: close port area transformer substation voltage control objectives, critical point power factor controlling target and close idle control objectives in port area transformer station;
In described pass port area transformer station, busbar voltage controls between the early warning upper limit and early warning lower limit, and described pass port area transformer substation voltage control objectives is the one-level control objectives of AVQC;
The upper limit of described critical point power factor
and lower limit
be the Two-stage control target of AVQC;
In described AVQC computational process, power factor specification is converted into reactive power index; When critical point reactive power is sent, critical point power factor is negative value, critical point power factor
with critical point reactive power Q with 1. following and 2. formula represent:
When critical point reactive power is not sent, critical point power factor is on the occasion of, critical point power factor
with critical point reactive power Q with 3. following and 4. formula represent:
According to critical point power factor higher limit
lower limit
and critical point active-power P obtains the higher limit Q of critical point reactive power
maxwith lower limit Q
max, critical point reactive power mean value and median are Q
mid;
In described pass port area transformer station, idle control objectives is the three class control target of AVQC;
In described step B, described improvement nine-zone graph comprises main throwing region, cuts region, for cutting region, waiting and cut region and six kinds, region of transferring the files for throwing region, master;
Described main throwing region is for preferentially to drop into capacitor area; Described standby region of throwing is that suboptimum drops into capacitor area; Described master cuts region for preferentially to excise capacitor area; Described standby region of cutting is suboptimum excision capacitor area; It is suboptimum excision capacitor area that described time cuts region; Described region of transferring the files is for adjustment transformer gear region.
2. as claimed in claim 1 towards the distribution overall situation voltage and reactive power coordinated control method of multi-object, it is characterized in that, in described step C, described formation combination Coordinated Control Scheme comprises the steps:
1) transformer station's regulation and control unit excises capacitor operation by force;
2) perform combined capacitor to throw, cut strategy;
3) transformer gear regulation strategy is performed.
3., as claimed in claim 2 towards the distribution overall situation voltage and reactive power coordinated control method of multi-object, it is characterized in that, described step 1) in, to single transformer station regulation and control unit, its reactive power releasing capacity must not exceed prescribed limits; Transformer station's regulation and control unit reactive power releasing being exceeded to prescribed limits performs the operation of excising capacitor by force.
4., as claimed in claim 2 towards the distribution overall situation voltage and reactive power coordinated control method of multi-object, it is characterized in that, described step 2) in, perform combined capacitor regulation strategy and comprise the steps:
A, the combination seeking optimal case meet critical point power factor within the scope of bound;
If b step a cannot meet critical point power factor command, then perform the combination of optimal case-suboptimal design;
If c step b cannot meet the requirement of critical point power factor, in the port area of pass, choose an execution in all regulation and control unit schemes, make to regulate rear critical point reactive power Q closest to Q
mid.
5. as claimed in claim 2 towards the distribution overall situation voltage and reactive power coordinated control method of multi-object, it is characterized in that, described step 3) in, do not perform capacitor switching strategy and voltage performs the measure of corresponding ascending, descending shelves higher than early warning higher limit or lower than the regulation and control unit of early warning lower limit;
Follow the principle that the high higher level's transformer gear of electric pressure preferentially regulates when performing corresponding ascending, descending shelves measure: regulation and control unit performs the regulation strategy dropping into capacitor or transformer upshift when higher level transformer station, then the regulation and control unit that next stage transformer station is attached thereto does not produce transformer upshift strategy; When upper level transformer station regulation and control unit performs the regulation strategy of excision capacitor or transformer downshift, then the regulation and control unit that next stage transformer station is attached thereto does not produce transformer down-shift strategy.
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