CN109167393A - Power distribution network backbone point pressure regulation method and system based on distributed photovoltaic power generation system - Google Patents
Power distribution network backbone point pressure regulation method and system based on distributed photovoltaic power generation system Download PDFInfo
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- CN109167393A CN109167393A CN201811187510.9A CN201811187510A CN109167393A CN 109167393 A CN109167393 A CN 109167393A CN 201811187510 A CN201811187510 A CN 201811187510A CN 109167393 A CN109167393 A CN 109167393A
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- H02J3/383—
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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
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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 discloses a kind of power distribution network backbone point pressure regulation methods and system based on distributed photovoltaic power generation system.The pressure regulation method includes: the busbar voltage of the power distribution network 380V of real-time acquisition distributed photovoltaic power generation system；When the busbar voltage of 380V is greater than voltage threshold, start timing；When timing time is greater than time threshold, current season is obtained；The reactor within the scope of corresponding preset capacity is obtained according to current season；The shunt reactor on backbone point 10kV bus；It is out-of-limit whether the busbar voltage of the 380V after judging the reduction acquired in real time occurs；The busbar voltage generation of 380V after reduction is more prescribed a time limit, adjust the 380V of the parameter of reactor after reducing busbar voltage do not occur it is out-of-limit；Stop adjusting the busbar voltage of 380V.Pressure regulation method of the invention uses active distribution network tidal current computing method under the fluctuation of distributed photovoltaic power generation system photovoltaic power output, to analyze the bus over-voltage condition of power distribution network, finally realizes and carries out dynamic regulation to the busbar voltage of backbone point.
Description
Technical field
The present invention relates to technical field of photovoltaic power generation, in particular to the distribution under a kind of fluctuation based on photovoltaic power generation
Net backbone point pressure regulation method and system.
Background technique
The basic equipment of existing distributed photovoltaic power generation system is mainly set by photovoltaic cell component, gird-connected inverter etc.
Standby component units, wiring directly connect in user side, and above-mentioned distributed photovoltaic power generation system usually passes through photovoltaic power generation certainly with user
Income is obtained with the operational mode of, remaining electricity online.
However, the photovoltaic power generation of high permeability causes distribution network voltage to get over the rapid development of distributed photovoltaic power generation
The problem of limit, can not be ignored.Currently, scholars are generally from photovoltaic DC-to-AC converter control, increase energy storage device and change for this problem
Start in terms of depressor tap pressure regulation three, to improve above-mentioned distribution network voltage, there is a situation where out-of-limit.Wherein, photovoltaic DC-to-AC converter control
System is limited for the ability for adjusting voltage out-of-limit, and photovoltaic DC-to-AC converter is difficult to adopt unified producer, is difficult unified allocation of resources；Increase
Energy storage device can adjust voltage out-of-limit to a certain extent, but will definitely increase cost；And for setting in domestic power distribution network
Standby status is only equipped with a small amount of adjustable load tap changer, and adjustable range and flexibility are all very poor.
Summary of the invention
The present invention is directed to solve at least one of the technical problems existing in the prior art or related technologies.
For this purpose, the first object of the present invention is to propose a kind of power distribution network backbone point based on distributed photovoltaic power generation system
Pressure regulation method.
The second object of the present invention is to propose a kind of power distribution network backbone point pressure regulation based on distributed photovoltaic power generation system
System.
To achieve the goals above, the technical solution of first aspect present invention provides a kind of based on distributed photovoltaic hair
The power distribution network backbone point pressure regulation method of electric system, the pressure regulation method include: to acquire the distributed photovoltaic power generation system in real time
The busbar voltage of power distribution network 380V；When the busbar voltage of the 380V is greater than voltage threshold, start timing；When timing time is big
When time threshold, current season is obtained；According to the current season, the reactor within the scope of corresponding preset capacity is obtained；
The in parallel reactor on backbone point 10kV bus, for the reactor absorb in real time the reactive power of the power distribution network with
Reduce the busbar voltage of the 380V；It is out-of-limit whether the busbar voltage of the 380V after judging the reduction acquired in real time occurs；
The busbar voltage generation of 380V after reduction is more prescribed a time limit, and the parameter of the reactor is adjusted, and continues judgement in real time
It is out-of-limit whether the busbar voltage of the 380V after the reduction of acquisition occurs, and the busbar voltage of the 380V after reducing is not
Occur out-of-limit；The busbar voltage of the 380V is adjusted in stopping.
Preferably, the power distribution network backbone point pressure regulation method based on distributed photovoltaic power generation system further include: work as institute
When stating the busbar voltage of 380V less than or equal to the voltage threshold, the busbar voltage of the 380V is adjusted in stopping；Work as institute
When stating timing time less than or equal to the time threshold, the busbar voltage of the 380V is adjusted in stopping；After reduction
The busbar voltage of the 380V does not occur more to prescribe a time limit, and the busbar voltage of the 380V is adjusted in stopping.
Preferably, described according to the current season, the step of obtaining the reactor within the scope of corresponding preset capacity, tool
Body includes: to obtain the reactor in 2000kvar to 3000kvar capacity when the current season is spring；When described current
When season is summer, the reactor in 3500kvar to 5000kvar capacity is obtained；When the current season is autumn, obtain
Reactor in 2000kvar to 3500kvar capacity；When the current season is winter, 1000kvar is obtained extremely
Reactor in 2500kvar capacity.
Preferably, whether the busbar voltage for judging the 380V after the reduction acquired in real time occurs out-of-limit step
Suddenly, it specifically includes: judging whether the busbar voltage of the 380V after reducing meets constraint condition Uimin≤Ui≤Uimax；Work as drop
The busbar voltage of the 380V after low meets constraint condition Uimin≤Ui≤UimaxWhen, then the bus of the 380V after reducing
Voltage does not occur out-of-limit；Otherwise, the busbar voltage of the 380V after reduction occurs out-of-limit；Wherein, UiFor the 380V after reduction
Busbar voltage, UiminAnd UimaxThe lower limit value and upper limit value of the busbar voltage limit value of 380V after respectively reducing.
Preferably, the voltage threshold is 1.07UN, the UNFor the 380V bus of the distributed photovoltaic power generation system
Voltage rating；The range of the time threshold is 60s to 70s；And the parameter of the reactor includes the equivalent resistance of reactor
It is anti-.
The technical solution of second aspect of the present invention provides a kind of power distribution network maincenter based on distributed photovoltaic power generation system
Point voltage-regulating system, which includes: acquisition unit, for acquiring the power distribution network of the distributed photovoltaic power generation system in real time
The busbar voltage of 380V；Timing unit, for starting timing when the busbar voltage of the 380V is greater than voltage threshold；It obtains
Unit, for obtaining current season when timing time is greater than time threshold；The acquiring unit is also used to work as according to
Preceding season obtains the reactor within the scope of corresponding preset capacity；Unit is adjusted, for institute in parallel on backbone point 10kV bus
Reactor is stated, so that the reactor absorbs the reactive power of the power distribution network in real time to reduce the busbar voltage of the 380V；
Judging unit, for judging it is out-of-limit whether the busbar voltage of the 380V after the reduction acquired in real time occurs；The adjusting is single
Member, the busbar voltage generation for being also used to 380V after reducing more are prescribed a time limit, and the parameter of the reactor and described is adjusted
Judging unit, it is out-of-limit whether the busbar voltage of the 380V after being also used to continue to judge the reduction acquired in real time occurs, until
The busbar voltage of the 380V after reduction does not occur out-of-limit；The adjusting unit, is also used to stop the bus to the 380V
Voltage is adjusted.
Preferably, the adjusting unit is also used to when the busbar voltage of the 380V is less than or equal to the voltage threshold,
The busbar voltage of the 380V is adjusted in stopping；The adjusting unit is also used to be less than or equal to institute when the timing time
When stating time threshold, the busbar voltage of the 380V is adjusted in stopping；And the adjusting unit, it is also used to after reducing
The busbar voltage of the 380V do not occur more to prescribe a time limit, the busbar voltage of the 380V is adjusted in stopping.
Preferably, the acquiring unit is specifically used for: when the current season is spring, obtaining 2000kvar extremely
Reactor in 3000kvar capacity；When the current season is summer, obtain in 3500kvar to 5000kvar capacity
Reactor；When the current season is autumn, the reactor in 2000kvar to 3500kvar capacity is obtained；When described current
When season is winter, the reactor in 1000kvar to 2500kvar capacity is obtained.
Preferably, the judging unit is specifically used for: judging whether the busbar voltage of the 380V after reducing meets about
Beam condition Uimin≤Ui≤Uimax；The busbar voltage of 380V after reduction meets constraint condition Uimin≤Ui≤UimaxWhen,
The busbar voltage of the 380V after then reducing does not occur out-of-limit；Otherwise, the busbar voltage of the 380V after reduction is got over
Limit；Wherein, UiFor the busbar voltage of the 380V after reduction, UiminAnd UimaxThe busbar voltage of 380V after respectively reducing limits
The lower limit value and upper limit value of value.
Preferably, the voltage threshold is 1.07UN, the UNFor the 380V bus of the distributed photovoltaic power generation system
Voltage rating；The range of the time threshold is 60s to 70s；And the parameter of the reactor includes the equivalent resistance of reactor
It is anti-.
Beneficial effects of the present invention:
Power distribution network backbone point pressure regulation method provided by the invention based on distributed photovoltaic power generation system, in distributed photovoltaic
Under the fluctuation of the photovoltaic power output of electricity generation system, suitable active distribution network tidal current computing method is used, to analyze power distribution network
Bus over-voltage condition finally realizes and carries out dynamic regulation to the busbar voltage of backbone point.Specifically, by acquiring in real time point
The busbar voltage of the 380V of cloth photovoltaic generating system, and be continued above the case where the busbar voltage of 380V is greater than voltage threshold
When time threshold, obtain current season, obtain the reactor within the scope of corresponding preset capacity further according to current season, so as to
The reactor in parallel is based on active distribution so that reactor absorbs the reactive power of power distribution network in real time on backbone point 10kV bus
Net tidal current computing method can reduce the busbar voltage of 380V, and the busbar voltage generation of the 380V after reduction is more prescribed a time limit, and adjust
The parameter of the whole reactor, and continue to judge whether the busbar voltage of the 380V after the reduction occurs it is out-of-limit, until the reduction
The busbar voltage of 380V afterwards do not occur it is out-of-limit, just stop the busbar voltage of 380V is adjusted, reached the mother of 380V
Line drop controls all node voltages of power distribution network in corresponding default model down to the purpose in corresponding preset range
In enclosing, the distribution network voltage generated when solving the distributed photovoltaic power generation system access power distribution network of high permeability is out-of-limit to be asked
Topic；Further, with previous using photovoltaic DC-to-AC converter control, the technology hand of increase energy storage device and load tap changer pressure regulation
Section is compared to solve the problems, such as that above-mentioned distribution network voltage is out-of-limit, and pressure regulation method provided by the invention can substantially reduce cost, together
When backbone point voltage regulation limits it is wider, and then increase backbone point voltage adjust flexibility.
Additional aspect and advantage of the invention will become obviously in the following description, or practice understanding through the invention
It arrives.
Detailed description of the invention
Fig. 1 shows the power distribution network backbone point pressure regulation based on distributed photovoltaic power generation system of one embodiment of the present of invention
The schematic flow diagram of method；
Fig. 2 a shows the distributed photovoltaic that the installed capacity of areas of Shenyang one of one embodiment of the present of invention is 200kW
24 hour periods of electricity generation system under the conditions of summer typical fine day, cloudy, rainy day and shower turn cloudy 4 kinds of different weathers
Day photovoltaic power curve；
Fig. 2 b showed the rural area, market, enterprise and institution and industry of one embodiment of the present of invention at 24 hours
Between load characteristic curve in section；
Fig. 3 shows Shenyang some region of the matching based on distributed photovoltaic power generation system of one embodiment of the present of invention
The schematic diagram of power grid；
Fig. 4 a shows 380V busbar voltage deviation before the addition reactor of one embodiment of the present of invention and reactance is added
The curve graph of 380V busbar voltage deviation after device；
Fig. 4 b shows 10kV busbar voltage deviation before the addition reactor of one embodiment of the present of invention and reactance is added
The curve graph of 10kV busbar voltage deviation after device；
Fig. 5 shows the power distribution network backbone point pressure regulation based on distributed photovoltaic power generation system of one embodiment of the present of invention
The schematic block diagram of system.
Specific embodiment
To better understand the objects, features and advantages of the present invention, with reference to the accompanying drawing and specific real
Applying mode, the present invention is further described in detail.It should be noted that in the absence of conflict, the implementation of the application
Feature in example and embodiment can be combined with each other.
In the following description, numerous specific details are set forth in order to facilitate a full understanding of the present invention, still, the present invention may be used also
To be implemented using other than the one described here other modes, therefore, protection scope of the present invention is not limited to following public affairs
The limitation for the specific embodiment opened.
Fig. 1 shows the power distribution network backbone point pressure regulation based on distributed photovoltaic power generation system of one embodiment of the present of invention
The schematic flow diagram of method.Wherein, UNFor the voltage rating 380V of the 380V bus of distributed photovoltaic power generation system, such as Fig. 1 institute
Show, a kind of power distribution network backbone point pressure regulation method based on distributed photovoltaic power generation system, comprising:
Step 102, the busbar voltage of the power distribution network 380V of distributed photovoltaic power generation system is acquired in real time；
Step 104, judge whether the busbar voltage is greater than 1.07UN；When the busbar voltage is greater than 1.07UNWhen, carry out step
106；When the busbar voltage is less than or equal to 1.07UNWhen, carry out step 120；
Step 106, start timing；
Step 108, judge whether timing time is greater than time threshold；When timing time is greater than time threshold, walked
Rapid 110；When timing time is less than or equal to time threshold, step 120 is carried out；
Step 110, current season is obtained；
Step 112, according to current season, the reactor within the scope of corresponding preset capacity is obtained；
Step 114, reactor in parallel on backbone point 10kV bus, so that the reactor absorbs the nothing of power distribution network in real time
Function power is to reduce the busbar voltage of 380V；
Step 116, it is out-of-limit whether the busbar voltage of the 380V after the reduction that judgement acquires in real time occurs；After the reduction
The busbar voltage generation of 380V is more prescribed a time limit, and step 118 and return step 116, the bus of the 380V after the reduction are carried out
Out-of-limit, progress step 120 does not occur for voltage；
Step 118, the parameter of the reactor is adjusted；
Step 120, stop that the busbar voltage of 380V is adjusted.
Power distribution network backbone point pressure regulation method provided by the invention based on distributed photovoltaic power generation system, in distributed photovoltaic
Under the fluctuation of the photovoltaic power output of electricity generation system, suitable active distribution network tidal current computing method is used, to analyze power distribution network
Bus over-voltage condition finally realizes and carries out dynamic regulation to the busbar voltage of backbone point.Specifically, by acquiring in real time point
The busbar voltage of the 380V of cloth photovoltaic generating system, and be continued above the case where the busbar voltage of 380V is greater than voltage threshold
When time threshold, obtain current season, obtain the reactor within the scope of corresponding preset capacity further according to current season, so as to
The reactor in parallel is based on active distribution so that reactor absorbs the reactive power of power distribution network in real time on backbone point 10kV bus
Net tidal current computing method can reduce the busbar voltage of 380V, and the busbar voltage generation of the 380V after reduction is more prescribed a time limit, and adjust
The parameter of the whole reactor, and continue to judge whether the busbar voltage of the 380V after the reduction occurs it is out-of-limit, until the reduction
The busbar voltage of 380V afterwards do not occur it is out-of-limit, just stop the busbar voltage of 380V is adjusted, reached the mother of 380V
Line voltage and the busbar voltage of 10kV are reduced to the purpose in corresponding preset range, and then control all nodes of power distribution network
In corresponding preset range, what is generated when solving the distributed photovoltaic power generation system access power distribution network of high permeability matches voltage
The problem of power grid out-of-limit；Further, with previous using photovoltaic DC-to-AC converter control, increase energy storage device and transformer point
The technological means of connector pressure regulation is compared to solve the problems, such as that above-mentioned distribution network voltage is out-of-limit, and pressure regulation method provided by the invention can be with
The flexibility that the voltage for substantially reducing cost, while the voltage regulation limits of backbone point are wider, and then increasing backbone point is adjusted.
Further, when the busbar voltage of 380V be less than or equal to voltage threshold, timing time be less than or equal to time threshold or
Person's busbar voltage, which is newly worth, not to be occurred more to prescribe a time limit, and illustrates that voltage out-of-limit problem, or the busbar voltage of acquisition does not occur in power distribution network
It may be voltage out-of-limit problem of short duration caused by certain interference electric signals, or be newly worth in busbar voltage and do not occur more to prescribe a time limit,
Directly stop that the busbar voltage of 380V is adjusted, achieved the purpose that carry out intelligent adjusting to the busbar voltage of 380V,
It ensure that the functional reliability of the pressure regulation method.In the present embodiment, it can be provided with open in the control loop of reactor
It closes, by turning off switch, reactor can be ineffective, to achieve the purpose that stop that the busbar voltage of 380V is adjusted.
In the present embodiment, power distribution network is divided into three voltage class, is 66kV, 10kV and 380V respectively, and the present invention combines
The photovoltaic power producing characteristics and part throttle characteristics of representative region, and active distribution network tidal current computing method is used, to determine distribution
Net can that there is a situation where busbar voltages be out-of-limit under the fluctuation that the photovoltaic of distributed photovoltaic power generation system is contributed.
In active distribution network Load flow calculation, the electric system of any complexity can be summarized as following elements (parameter) group
At: generator (Injection Current or power), load (injection negative electric current or power), power transmission line branch (resistance, reactance), transformation
On device branch (resistance, reactance, no-load voltage ratio), bus on ground leg (impedance and admittance), route to ground leg (generally line
Road charge point holds admittance)；
Using admittance matrix YBWhen, node Injection CurrentAnd node voltageConstitute system of linear equations, i.e. electric power networks
Nodal voltage equation (1):
Wherein,
Formula (2) is unfolded to obtain:
Since the node injection rate measured in practical power distribution network is generally not electric current but power, it is therefore necessary to will be in formula
Node Injection Current is indicated with node injecting power.According to the relationship between node injecting power and node Injection Current and lead
The transformation of matrix received obtains the mathematical model of electric power system tide calculating, i.e. power flow equation (3):
Wherein,PiAnd QiThe respectively node voltage of node i, injection active power and injection reactive power.Based on tide
Flow equation (3) it can be concluded that, when some period photovoltaic in a certain region one day is contributed the (P i.e. in power flow equationi) excessively high,
Even if there is certain load consumption in the region, the busbar voltage of low pressure 380V also will appear out-of-limit problem, at this point, according to current season
Section obtains the reactor within the scope of corresponding preset capacity, reactor in parallel on the 10kV bus of backbone point 66kV/10kV,
The reactor can absorb the reactive power Q of the power distribution network in real timei, and then reduce the busbar voltage of 380V.
Further, since photovoltaic power output has the characteristics that randomness and intermittent, in order to effectively reduce its fluctuation
Property influence to power distribution network operation stability, the present embodiment analyzes the photovoltaic power output probability of areas of Shenyang summer several typical days
Distribution character.It is typical in summer that Fig. 2 a shows the distributed photovoltaic power generation system that the installed capacity of areas of Shenyang one is 200kW
Fine day, cloudy, rainy day and shower turn cloudy 4 kinds of different weathers under the conditions of 24 hour periods day photovoltaic power curve.
As shown in Figure 2 a, in fine day, 14 to 24 DEG C of temperature, day photovoltaic contributes average value as 64kW；At broken sky, temperature 17 to 24
DEG C, day photovoltaic contributes average value as 78kW；In the rainy day, 15 to 26 DEG C of temperature, day photovoltaic contributes average value as 48kW；In shower
When turning cloudy, 19 to 26 DEG C of temperature, day photovoltaic contributes average value as 60kW.
Further, the load of different exemplary functions areas (rural area, market, enterprise and institution and industry) has different
Wave characteristic.It is bent that Fig. 2 b shows the part throttle characteristics of rural area, market, enterprise and institution and industry in 24 hour periods
Line.As shown in Figure 2 b, 6 points to 8 points or so fluctuations are the most obvious at night for rural area load；6 points or so in the morning of market load
Start to fluctuate, and in trend is continued to increase, until at night, 10 points on a declining curve；Enterprises and institutions' load is in 10 AM under
Noon two o'clock or so fluctuation is maximum；Industrial load whole day is in stable variation tendency substantially.
Further, using ETAP (ETAP be electric power electric analysis, electric energy management Comprehensive Analysis Software system letter
Claim) some region of power distribution network based on distributed photovoltaic power generation system in software emulation Shenyang shown in Fig. 3, in conjunction with Fig. 2 a and figure
Shown in 2b, analyze: in a market of areas of Shenyang, 11 o'clock of summer between 14 o'clock, exists for photovoltaic power output
It is maximum in one day, it is about 200kW, the part throttle characteristics in market size within the period at 11 o'clock to 14 o'clock is about
20kW is based on the model of power flow equation (3), since photovoltaic power output is excessively high, necessarily causes the busbar voltage of low pressure 380V beyond electricity
The limit value of pressure.The mother of the power distribution network 380V based on distributed photovoltaic power generation system can be collected by the power distribution network in Fig. 3
Line voltage is 1.3UN, therefore the reactor of a 3750kvar capacity has been selected, and the parallel connection size is on 10kV bus
The reactor of 3750kvar capacity carries out Reactive-power control, to absorb reactive power extra in power distribution network, to make 380V bus
On voltage drop down to 1.05UN, busbar voltage 1.05U after confirming the reductionNDo not occur out-of-limit, just stops to the mother of the 380V
Line voltage is adjusted, and meets the voltage indexes of power distribution network 380V low-voltage bus bar, so that improving this is based on distributed photovoltaic
The operation stability of electricity generation system power distribution network.
Fig. 4 a shows 380V busbar voltage deviation before the addition reactor of one embodiment of the present of invention and reactance is added
The curve graph of 380V busbar voltage deviation after device.10kV is female before Fig. 4 b shows the addition reactor of one embodiment of the present of invention
Line voltage deviation and the curve graph that 10kV busbar voltage deviation after reactor is added.As shown in figures 4 a and 4b, be added reactance
The busbar voltage deviation of each node before device is compared, and pressure regulation method of the invention makes each node being added after reactor
380V busbar voltage deviation and the 10kV busbar voltage deviation of each node reduce, and further illustrate pressure regulation method of the invention
Solve the problems, such as that the distribution network voltage generated when the distributed photovoltaic power generation system access power distribution network of high permeability is out-of-limit.
In one embodiment of the invention, described according to the current season, it obtains within the scope of corresponding preset capacity
Reactor the step of, specifically include: when the current season be spring when, obtain 2000kvar to 3000kvar capacity in
Reactor；When the current season is summer, the reactor in 3500kvar to 5000kvar capacity is obtained；When described current
When season is autumn, the reactor in 2000kvar to 3500kvar capacity is obtained；When the current season is winter, obtain
Reactor in 1000kvar to 2500kvar capacity.
In the present embodiment, the reactor within the scope of corresponding preset capacity is obtained by current season, to reach in
The reactor of different capabilities is put on centring point, so that the reactor of different capabilities meets the photovoltaic power producing characteristics of current season, into
And when adjusting the parameter of the reactor, the busbar voltage of 380V can be rapidly and accurately reduced, so that after the reduction
380V busbar voltage meets constraint condition as early as possible, to determine that it is out-of-limit that the 380V busbar voltage after reducing does not occur, increases 380V
The adjusting sensitivity of busbar voltage.
In one embodiment of the invention, the busbar voltage for judging the 380V after the reduction acquired in real time is
It is no that out-of-limit step occurs, it specifically includes: judging whether the busbar voltage of the 380V after reducing meets constraint condition Uimin
≤Ui≤Uimax；The busbar voltage of 380V after reduction meets constraint condition Uimin≤Ui≤UimaxWhen, then after reducing
The busbar voltage of the 380V does not occur out-of-limit；Otherwise, the busbar voltage of the 380V after reduction occurs out-of-limit；Wherein, Ui
For the busbar voltage of the 380V after reduction, UiminAnd UimaxThe lower limit value of the busbar voltage limit value of 380V after respectively reducing
And upper limit value.
In the present embodiment, to guarantee power system stability operation, the busbar voltage of the 380V after reduction needs to meet about
Beam condition Uimin≤Ui≤Uimax.In specific embodiment, UiminAnd UimaxUsually it is arranged in advance, UiminFor 0.93UN, UimaxFor
1.07UN, the UNFor the voltage rating of the 380V bus of the distributed photovoltaic power generation system, i.e. 380V.
In one embodiment of the invention, the voltage threshold is 1.07UN, the UNFor the distributed photovoltaic power generation
The voltage rating of the 380V bus of system；The range of the time threshold is 60s to 70s；And the parameter packet of the reactor
Include the equivalent impedance of reactor.
In the present embodiment, the parameter of reactor includes the equivalent impedance of reactor, therefore adjusts the parameter master of reactor
If changing the equivalent impedance of reactor.In specific embodiment, reactor is to drive electricity by the transmission mechanism of REgulatable reactor
Winding inside anti-device generates relative angular displacement, to reach the synthesis effective turn for changing winding in reactor, and makes reactor
Equivalent impedance change, adjust distribution network reactive power in a certain range while adjusting reactance value to reach
Purpose.In specific embodiment, UNFor 380V, time threshold 60s, 65S or 70s.
Fig. 5 shows the power distribution network backbone point pressure regulation based on distributed photovoltaic power generation system of one embodiment of the present of invention
The schematic block diagram of system.As shown in figure 5, should be wrapped based on the power distribution network backbone point voltage-regulating system 500 of distributed photovoltaic power generation system
It includes:
Acquisition unit 502, the busbar voltage of the power distribution network 380V for acquiring distributed photovoltaic power generation system in real time；
Timing unit 504, for starting timing when the busbar voltage of the 380V is greater than voltage threshold；
Acquiring unit 506, for obtaining current season when timing time is greater than time threshold；
The acquiring unit 506 is also used to obtain the reactance within the scope of corresponding preset capacity according to the current season
Device；
Unit 508 is adjusted, for the reactor in parallel on backbone point 10kV bus, so that the reactor is inhaled in real time
The reactive power of the power distribution network is received to reduce the busbar voltage of the 380V；
Judging unit 510, for judging it is out-of-limit whether the busbar voltage of the 380V after the reduction acquired in real time occurs；
The adjusting unit 508, the busbar voltage generation for being also used to 380V after reducing more is prescribed a time limit, described in adjustment
The parameter of reactor, and
The busbar voltage of the judging unit 510, the 380V after being also used to continue to judge the reduction acquired in real time is
No generation is out-of-limit, and the busbar voltage of the 380V after reducing does not occur out-of-limit；
The adjusting unit 508 is also used to stop that the busbar voltage of the 380V is adjusted.
Power distribution network backbone point voltage-regulating system 500 provided by the invention based on distributed photovoltaic power generation system, in distribution
Under the fluctuation of the photovoltaic power output of photovoltaic generating system, suitable active distribution network tidal current computing method is used, to analyze distribution
The bus over-voltage condition of net finally realizes and carries out dynamic regulation to the busbar voltage of backbone point；Specifically, single by acquisition
Member 502 acquires the busbar voltage of the 380V of distributed photovoltaic power generation system, and the busbar voltage recorded in timing unit 504 in real time
When duration the case where greater than voltage threshold is more than time threshold, current season is obtained by acquiring unit 506, then by obtaining
It takes unit 506 to obtain the reactor within the scope of corresponding preset capacity according to current season, adjusts unit 508 in will pass through
The reactor in parallel is based on active distribution network so that reactor absorbs the reactive power of power distribution network in real time on centring point 10kV bus
Tidal current computing method, and then the busbar voltage of 380V can be reduced, bus electricity after determining the reduction by judging unit 510
Pressure life is more prescribed a time limit, and adjusts the parameter of the reactor by adjusting unit 508, and continuing through the judgement of judging unit 510 should
It is out-of-limit whether the busbar voltage after reduction occurs, the busbar voltage after the reduction do not occur it is out-of-limit, just stop to 380V's
Busbar voltage is adjusted, reached the busbar voltage of 380V and the busbar voltage of 10kV are reduced to it is corresponding pre-
If the purpose in range, and then all node voltages for controlling power distribution network solve high permeability in corresponding preset range
Distributed photovoltaic power generation system access power distribution network when the out-of-limit problem of the distribution network voltage that generates；Further, with it is previous
Above-mentioned power distribution network electricity is solved using the technological means of photovoltaic DC-to-AC converter control, increase energy storage device and load tap changer pressure regulation
Out-of-limit problem is pressed to compare, pressure regulation method provided by the invention can substantially reduce cost, while the voltage of backbone point adjusts model
Enclose flexibility that is wider, and then increasing the voltage adjusting of backbone point.
In one embodiment of the invention, the adjusting unit 508 is also used to be less than when the busbar voltage of the 380V
When equal to the voltage threshold, the busbar voltage of the 380V is adjusted in stopping；The adjusting unit 508, is also used to work as
When the timing time is less than or equal to the time threshold, the busbar voltage of the 380V is adjusted in stopping；And it is described
Unit 508 is adjusted, the busbar voltage for being also used to 380V after reducing does not occur more to prescribe a time limit, and stops the mother to the 380V
Line voltage is adjusted.
In the present embodiment, when the busbar voltage of 380V is less than or equal to voltage threshold, timing time is less than or equal to time threshold
Value or busbar voltage, which are newly worth, not to be occurred more to prescribe a time limit, and illustrates that voltage out-of-limit problem, or the bus of acquisition does not occur in power distribution network
Voltage may be of short duration voltage out-of-limit problem caused by certain interference electric signals, or busbar voltage be newly worth do not occur it is out-of-limit
When, by adjusting unit 508 directly stop that the busbar voltage of 380V is adjusted, has reached the voltage-regulating system to 380V bus
The intelligent of voltage is adjusted, and ensure that the stability of voltage-regulating system work.
In one embodiment of the invention, the acquiring unit 506 is specifically used for: when the current season is spring
When, obtain the reactor in 2000kvar to 3000kvar capacity；When the current season is summer, 3500kvar is obtained extremely
Reactor in 5000kvar capacity；When the current season is autumn, obtain in 2000kvar to 3500kvar capacity
Reactor；When the current season is winter, the reactor in 1000kvar to 2500kvar capacity is obtained.
In the present embodiment, the reactor within the scope of the corresponding preset capacity of current season is obtained by acquiring unit 506,
To reach the reactor for putting into different capabilities on backbone point, so that the photovoltaic that the reactor of different capabilities meets current season goes out
Force characteristic, and then when adjusting the parameter of the reactor, the busbar voltage of 380V can be rapidly and accurately reduced, so that the drop
380V busbar voltage after low meets constraint condition as early as possible, to determine that it is out-of-limit that the 380V busbar voltage after reducing does not occur, increases
The adjusting sensitivity of 380V busbar voltage.
In one embodiment of the invention, judging unit 510 is specifically used for: the bus of the 380V after judgement reduction
Whether voltage meets constraint condition Uimin≤Ui≤Uimax；The busbar voltage of 380V after reduction meets constraint condition
Uimin≤Ui≤UimaxWhen, then the busbar voltage of the 380V after reducing does not occur out-of-limit；Otherwise, the 380V after reduction
Busbar voltage occur it is out-of-limit；Wherein, UiFor the busbar voltage of the 380V after reduction, UiminAnd UimaxAfter respectively reducing
The lower limit value and upper limit value of the busbar voltage limit value of 380V.
In the present embodiment, to guarantee power system stability operation, described in after the determining reduction of judging unit 510
The busbar voltage of 380V needs to meet constraint condition Uimin≤Ui≤Uimax.In specific embodiment, UiminAnd UimaxUsually set in advance
It sets, UiminFor 0.93UN, UimaxFor 1.07UN, the UNFor the specified electricity of the 380V bus of the distributed photovoltaic power generation system
Pressure, i.e. 380V.
In one embodiment of the invention, the voltage threshold is 1.07UN, the UNFor the distributed photovoltaic power generation
The voltage rating of the 380V bus of system；The range of the time threshold is 60s to 70s；And the parameter packet of the reactor
Include the equivalent impedance of reactor.
In the present embodiment, the parameter of reactor includes the equivalent impedance of reactor, therefore adjusts the parameter master of reactor
If changing the equivalent impedance of reactor.In specific embodiment, reactor is to drive electricity by the transmission mechanism of REgulatable reactor
Winding inside anti-device generates relative angular displacement, to reach the synthesis effective turn for changing winding in reactor, and makes reactor
Equivalent impedance change, adjust distribution network reactive power in a certain range while adjusting reactance value to reach
Purpose.In specific embodiment, UNFor 380V, time threshold 60s, 65S or 70s.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of power distribution network backbone point pressure regulation method based on distributed photovoltaic power generation system characterized by comprising
The busbar voltage of the power distribution network 380V of the distributed photovoltaic power generation system is acquired in real time；
When the busbar voltage of the 380V is greater than voltage threshold, start timing；
When timing time is greater than time threshold, current season is obtained；
According to the current season, the reactor within the scope of corresponding preset capacity is obtained；
The reactor in parallel on backbone point 10kV bus, so that the reactor absorbs the idle function of the power distribution network in real time
Rate is to reduce the busbar voltage of the 380V；
It is out-of-limit whether the busbar voltage of the 380V after judging the reduction acquired in real time occurs；
The busbar voltage generation of 380V after reduction is more prescribed a time limit, and the parameter of the reactor is adjusted, and
It is out-of-limit whether the busbar voltage of the 380V after continuing the reduction for judging to acquire in real time occurs, until reduce after described in
The busbar voltage of 380V does not occur out-of-limit；
The busbar voltage of the 380V is adjusted in stopping.
2. the power distribution network backbone point pressure regulation method according to claim 1 based on distributed photovoltaic power generation system, further includes:
When the busbar voltage of the 380V is less than or equal to the voltage threshold, the busbar voltage of the 380V is adjusted in stopping
Section；When the timing time is less than or equal to the time threshold, the busbar voltage of the 380V is adjusted in stopping；And
The busbar voltage of 380V after reduction does not occur more to prescribe a time limit, and the busbar voltage of the 380V is adjusted in stopping.
3. the power distribution network backbone point pressure regulation method according to claim 1 based on distributed photovoltaic power generation system, feature
It is, described according to the current season, the step of obtaining the reactor within the scope of corresponding preset capacity, specifically includes:
When the current season is spring, the reactor in 2000kvar to 3000kvar capacity is obtained；
When the current season is summer, the reactor in 3500kvar to 5000kvar capacity is obtained；
When the current season is autumn, the reactor in 2000kvar to 3500kvar capacity is obtained；
When the current season is winter, the reactor in 1000kvar to 2500kvar capacity is obtained.
4. the power distribution network backbone point pressure regulation method according to claim 1 based on distributed photovoltaic power generation system, feature
It is, whether the busbar voltage for judging the 380V after the reduction acquired in real time occurs out-of-limit step, it specifically includes:
Judge whether the busbar voltage of the 380V after reducing meets constraint condition Uimin≤Ui≤Uimax；Institute after reduction
The busbar voltage for stating 380V meets constraint condition Uimin≤Ui≤UimaxWhen, then the busbar voltage of the 380V after reducing is not sent out
Life is out-of-limit；Otherwise, the busbar voltage of the 380V after reduction occurs out-of-limit；
Wherein, UiFor the busbar voltage of the 380V after reduction, UiminAnd UimaxThe busbar voltage of 380V after respectively reducing limits
The lower limit value and upper limit value of value.
5. the power distribution network backbone point pressure regulation according to any one of claim 1 to 4 based on distributed photovoltaic power generation system
Method, which is characterized in that
The voltage threshold is 1.07UN, the UNFor the voltage rating of the 380V bus of the distributed photovoltaic power generation system；
The range of the time threshold is 60s to 70s；And
The parameter of the reactor includes the equivalent impedance of reactor.
6. a kind of power distribution network backbone point voltage-regulating system based on distributed photovoltaic power generation system characterized by comprising
Acquisition unit, the busbar voltage of the power distribution network 380V for acquiring the distributed photovoltaic power generation system in real time；
Timing unit, for starting timing when the busbar voltage of the 380V is greater than voltage threshold；
Acquiring unit, for obtaining current season when timing time is greater than time threshold；
The acquiring unit is also used to obtain the reactor within the scope of corresponding preset capacity according to the current season；
Adjust unit, for the reactor in parallel on backbone point 10kV bus, absorbed in real time for the reactor described in
The reactive power of power distribution network is to reduce the busbar voltage of the 380V；
Judging unit, for judging it is out-of-limit whether the busbar voltage of the 380V after the reduction acquired in real time occurs；
The adjusting unit, the busbar voltage generation for being also used to 380V after reducing more are prescribed a time limit, and the reactor is adjusted
Parameter, and
Whether the busbar voltage of the judging unit, the 380V after being also used to continue to judge the reduction acquired in real time gets over
Limit, the busbar voltage of the 380V after reducing do not occur out-of-limit；
The adjusting unit is also used to stop that the busbar voltage of the 380V is adjusted.
7. the power distribution network backbone point voltage-regulating system according to claim 6 based on distributed photovoltaic power generation system, feature
It is,
The adjusting unit is also used to stop when the busbar voltage of the 380V is less than or equal to the voltage threshold to described
The busbar voltage of 380V is adjusted；
The adjusting unit is also used to stop when the timing time is less than or equal to the time threshold to the 380V's
Busbar voltage is adjusted；And
The adjusting unit, the busbar voltage for being also used to 380V after reducing do not occur more to prescribe a time limit, stop to described
The busbar voltage of 380V is adjusted.
8. the power distribution network backbone point voltage-regulating system according to claim 6 based on distributed photovoltaic power generation system, feature
It is, the acquiring unit is specifically used for:
When the current season is spring, the reactor in 2000kvar to 3000kvar capacity is obtained；
When the current season is summer, the reactor in 3500kvar to 5000kvar capacity is obtained；
When the current season is autumn, the reactor in 2000kvar to 3500kvar capacity is obtained；
When the current season is winter, the reactor in 1000kvar to 2500kvar capacity is obtained.
9. the power distribution network backbone point voltage-regulating system according to claim 6 based on distributed photovoltaic power generation system, feature
It is, the judging unit is specifically used for:
Judge whether the busbar voltage of the 380V after reducing meets constraint condition Uimin≤Ui≤Uimax；Institute after reduction
The busbar voltage for stating 380V meets constraint condition Uimin≤Ui≤UimaxWhen, then the busbar voltage of the 380V after reducing is not sent out
Life is out-of-limit；Otherwise, the busbar voltage of the 380V after reduction occurs out-of-limit；
Wherein, UiFor the busbar voltage of the 380V after reduction, UiminAnd UimaxThe busbar voltage of 380V after respectively reducing limits
The lower limit value and upper limit value of value.
10. the power distribution network backbone point pressure regulation according to any one of claims 6 to 9 based on distributed photovoltaic power generation system
System, which is characterized in that
The voltage threshold is 1.07UN, the UNFor the voltage rating of the 380V bus of the distributed photovoltaic power generation system；
The range of the time threshold is 60s to 70s；And
The parameter of the reactor includes the equivalent impedance of reactor.
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