CN106340893B - A kind of distributed photovoltaic power generation Poewr control method based on virtual power plant - Google Patents
A kind of distributed photovoltaic power generation Poewr control method based on virtual power plant Download PDFInfo
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Abstract
The present invention provides a kind of distributed photovoltaic power generation Poewr control method based on virtual power plant；Active power Optimization Scheduling is run on into virtual power plant control centre, by the virtual power plant active power dispatch command that power grid regulation center is assigned optimize distribution and under reach each distributed photovoltaic power generation unit in factory；The node voltage reference value that virtual power plant control centre assigns according to power grid regulation center, into factory, each distributed photovoltaic power generation unit assigns node voltage reference value, sagging slope is arranged automatically and carries out REACTIVE POWER/VOLTAGE CONTROL according to voltage reference value and own reactive power adjustable adjusting range for each distributed photovoltaic power generation unit.Method proposed by the present invention realizes the information management of distributed photovoltaic power generation；The abandoning light cost for reducing entire virtual power plant, improves on-road efficiency；Self adaptive control of the distributed photovoltaic power generation to grid entry point voltage is realized simultaneously, influence of the distributed photovoltaic power generation to network voltage is reduced, ensure that the normal operation of power grid.
Description
Technical field
The present invention relates to the operation control technology fields of distributed photovoltaic power generation, and in particular to one kind is based on virtual power plant
Distributed photovoltaic power generation Poewr control method.
Background technique
In recent years, with distributed photovoltaic power generation, energy-storage system, miniature gas turbine distributed power supply
(Distributed Generator, DG) permeability in power grid is continuously improved, to the monitoring of power grid, operation, control and
Management brings lot of challenges.The it is proposed of virtual power plant (Virtual Power Plant, VPP) based on distributed power generation
It is considered as the new thinking of the one kind solved these problems, and becomes the hot spot of research and engineering mimoir both at home and abroad.
With quickling increase for China's distributed photovoltaic power generation grid connection capacity, the hair of " exploitation, multi-point dispersion access in flakes "
Exhibition trend increasingly shows, and brings new challenge to the operation, control and management of power grid, becomes and restricts distributed photovoltaic into one
Walk the limiting factor of development.Firstly, photovoltaic power generation is intermittent, the fluctuation of the active power output of randomness, electric network swim can be caused to change
Increase, the problems such as voltage deviation is out-of-limit, voltage fluctuation increases occurs so as to cause power grid.Also, the voltage of grid-connected point is inclined
Difference and fluctuating range are all higher than distribution net side, only rely on power distribution network and adjust the routine such as load tap changer and switching shunt capacitor
Measure will be unable to meet reactive voltage regulatory demand of overall importance.Secondly, will be unable to meet not by existing power grid regulation mode
Carry out multi-point and wide-ranging distributed photovoltaic access.Distributed photovoltaic power control techniques based on virtual power plant, which will become, to be solved
State the powerful measure of problem.
Current existing virtual power plant power control techniques, which have the disadvantage that, only considers having inside virtual power plant
Function power dispatching does not form the integral traffic control of active power and Reactive Power Control；Virtual power plant is not accounted for respectively to be distributed
The voltage of formula generator unit access point controls and does not account for the safe transmission means of information in virtual power plant；Therefore, existing
Technology is unable to satisfy the requirement of reactive voltage regulatory demand and the following multi-point and wide-ranging distributed photovoltaic access of overall importance, is easy
Leading to problems such as power grid occur, voltage deviation is out-of-limit, voltage fluctuation increases.
Summary of the invention
In view of this, a kind of distributed photovoltaic power generation Poewr control method based on virtual power plant provided by the invention,
This method provides a kind of effective for monitoring and control problem caused by distributed photovoltaic power generation " point is more, wide " access power grid
Technological approaches；So that distributed photovoltaic power generation participates in the active power scheduling and REACTIVE POWER/VOLTAGE CONTROL of system, and realize distribution
The information management of formula photovoltaic power generation；The abandoning light cost for reducing entire virtual power plant, improves on-road efficiency；It realizes simultaneously
Self adaptive control of the distributed photovoltaic power generation to grid entry point voltage reduces influence of the distributed photovoltaic power generation to network voltage,
It ensure that the normal operation of power grid.
The purpose of the present invention is what is be achieved through the following technical solutions:
A kind of distributed photovoltaic power generation Poewr control method based on virtual power plant, the method pass through distributed photovoltaic
Generated power control system realizes that the control system includes virtual power plant control centre and distributed photovoltaic power generation unit sheet
Ground control；The virtual power plant control centre and power grid regulation center interconnect, and with each distributed photovoltaic power generation unit
Carry out data transmission in wireless public network；
Described method includes following steps:
Step 1. is in a scheduling slot；The virtual power plant control centre receives each distributed photovoltaic power generation
The real-time traffic information that unit is sent, the real-time traffic information include active power output, reactive power output, active power
Adjustable extent, active power regulation range and node voltage；
Virtual power plant control centre described in step 2. receive that the power grid regulation center assigns to virtual power plant
The node voltage reference value of active power dispatch command and each distributed photovoltaic access point；
Virtual power plant control centre described in step 3. abandons light cost minimization as mesh according to using the entire virtual power plant
Target active power Optimal Operation Model obtains the active power dispatch command of each distributed photovoltaic power generation unit；
Virtual power plant control centre described in step 4. sends the wattful power to each distributed photovoltaic power generation unit
Rate dispatch command and the node voltage reference value；
Each distributed photovoltaic power generation unit of step 5. according to the active power dispatch command received to its from
Body carries out active power controller；
The section that step 6. calculates the reactive power adjustable extent of distributed photovoltaic power generation unit in real time and receives
Point voltage reference value, carries out adaptive reactive power/voltage control；
Each distributed photovoltaic power generation unit described in step 7. sends the reality after control to virtual power plant control centre
When operation information；
Virtual power plant control centre described in step 8., which assesses the described of virtual power plant described in next scheduling slot, to be had
Function power regulating range, and assessment result is sent to power grid regulation center, next scheduling is assigned for the power grid regulation center
The active power dispatch command of period.
Preferably, the step 3 includes:
3-1. establishes described using the abandoning light cost minimization of the virtual power plant as the active power Optimized Operation mould of target
Type；
The objective function of the scheduling model are as follows:
3-2. solves the scheduling model under the constraint condition of the scheduling model, obtains each distributed photovoltaic
The active power dispatch command of generator unit, i.e., the disaggregation of the described objective function；
Wherein, the constraint condition are as follows:
In formula,It indicates the active power dispatch command of distributed photovoltaic power generation unit i, becomes for the optimization of the model
Amount；PVPPFor the active power dispatch command for the entire virtual power plant that power grid regulation center is assigned；NPIt indicates in virtual power plant
Distributed photovoltaic power generation unit number；Indicate the abandoning light cost of distributed photovoltaic power generation unit i；For the distribution
The maximum power generation of formula photovoltaic generation unit i；For the minimum generated output of distributed photovoltaic power generation unit i, wherein0 < α < 1.
Preferably, the step 5 includes:
Each received active power dispatch command of distributed photovoltaic power generation unit of 5-1.；
The active power output valve P of each distributed photovoltaic power generation unit of 5-2. real-time measurementpv；
Each distributed photovoltaic power generation unit of 5-3. carries out active power controller, i.e., by the active power output valve Ppv
With active power dispatch command Ppv,EDDifference power is constituted, and the difference power is made to obtain gird-connected inverter by PI controller
The duty ratio D of Boost circuit, the PI controlling unit are equipped with output upper limit DmaxWith bottoming Dmin。
Preferably, the output upper limit D in the 5-3maxWith bottoming DminValue are as follows:
In formula, VOFor the voltage of gird-connected inverter DC bus；Vpv,maxFor the photovoltaic battery array DC voltage upper limit；
Vpv,minFor photovoltaic battery array DC voltage lower limit.
Preferably, the photovoltaic battery array DC voltage upper limit Vpv,maxAnd under the photovoltaic battery array DC voltage
Limit Vpv,minFinding process are as follows:
A. the intensity of illumination and temperature in real-time measurement environmental variance；
B. according to the intensity of illumination and temperature, the P-V curve of the distributed photovoltaic power generation unit is obtained；
C. on the P-V curve, the maximum power point P of the distributed photovoltaic power generation unit is obtainedpv,maxAnd and its
The corresponding photovoltaic battery array DC voltage upper limit Vpv,max；
D. basisAnd 0 < α < 1, obtain the minimum power point P of distributed photovoltaic power generation unitpv,min
And the corresponding photovoltaic battery array DC voltage lower limit Vpv,min。
Preferably, the step 6, comprising:
6-1. calculates distributed photovoltaic power generation unit reactive power adjustable extent in real time, that is, the distribution is calculated
The reactive power of photovoltaic generation unit i exports maximum valueAnd minimum value
6-2. is according to reactive power adjustable extent and the node voltage reference value received and described in receiving
Node voltage reference value Vpv,ref, calculate sagging slope k:
6-3. calculates the reactive power and instructs Qpv:
Work as Vpv≤min(Vpcc,max,βVpv,ref) and Vpv≥max(Vpcc,min,θVpv,ref) when,
Work as Vpv≥min(Vpcc,max,βVpv,ref) when,
Qpv=Qpv,min；
Work as Vpv≤max(Vpcc,min,θVpv,ref) when,
Qpv=Qpv,max；
In formula, Vpcc,maxFor the distributed photovoltaic power generation unit grid entry point upper voltage limit；Vpcc,minFor institute's distributed photovoltaic
Generator unit grid entry point lower voltage limit；β and θ is voltage regulation limits coefficient, generally takes 1 < β≤1.05,0.95≤θ < 1；Vpv
For the current distributed photovoltaic power generation unit grid entry point voltage value.
Preferably, the step 6-1 includes:
The reactive power for calculating distributed photovoltaic power generation unit i in real time exports maximum valueAnd minimum value
In formula,Maximum value is exported for the reactive power of distributed photovoltaic power generation unit i；For distributed light
The reactive power for lying prostrate generator unit i exports minimum value；For the gird-connected inverter rated capacity of distributed photovoltaic power generation unit i；It is exported for the real-time active power of distributed photovoltaic power generation unit i.
Preferably, the whole letters transmitted between the virtual power plant control centre and the distributed photovoltaic power generation unit
Breath passes through data information encryption.
Preferably, each scheduling slot when it is 5 to 15 minutes a length of.
It can be seen from the above technical scheme that the present invention provides a kind of, the distributed photovoltaic based on virtual power plant is sent out
Electric power control method；Active power Optimization Scheduling is run on into virtual power plant control centre, by power grid regulation center
The virtual power plant active power dispatch command assigned optimize distribution and under reach each distributed photovoltaic power generation system in factory；
The node voltage reference value that virtual power plant control centre is assigned according to power grid regulation center, each distributed photovoltaic power generation system
According to voltage reference value and own reactive power adjustable adjusting range, sagging slope is set automatically and carries out REACTIVE POWER/VOLTAGE CONTROL.This hair
The method of bright proposition realizes the information management of distributed photovoltaic power generation；The abandoning light cost for reducing entire virtual power plant, mentions
On-road efficiency is risen；Self adaptive control of the distributed photovoltaic power generation to grid entry point voltage is realized simultaneously, reduces distributed light
Influence of the volt power generation to network voltage, ensure that the normal operation of power grid.
Compared with the latest prior art, technical solution provided by the invention has following excellent effect:
1, technical solution provided by the present invention, by the active power Optimized Operation side of virtual power plant distributed photovoltaic
Method, the adaptive REACTIVE POWER/VOLTAGE CONTROL method of virtual power plant distributed photovoltaic and the letter of virtual power plant distributed photovoltaic
Cease transmission method composition；It is mentioned for monitoring and control problem caused by distributed photovoltaic power generation " point is more, wide " access power grid
For a kind of effective technological approaches；Realize the information management of distributed photovoltaic power generation；Reduce entire virtual power plant
Light cost is abandoned, on-road efficiency is improved；Self adaptive control of the distributed photovoltaic power generation to grid entry point voltage is realized simultaneously, is reduced
Influence of the distributed photovoltaic power generation to network voltage, ensure that the normal operation of power grid.
2, technical solution provided by the present invention, by active power and Reactive Power Control, so that distributed photovoltaic is sent out
The active power of electric participation system is dispatched and REACTIVE POWER/VOLTAGE CONTROL.
3, technical solution provided by the present invention is transmitted by security information in virtual power plant, realizes distributed light
Lie prostrate the information management of power generation.
4, technical solution provided by the present invention reduces entire void in virtual power plant active power economic load dispatching
The abandoning light cost for sending out power plant, improves on-road efficiency.
5, technical solution provided by the present invention realizes distributed photovoltaic power generation in REACTIVE POWER/VOLTAGE self adaptive control
Self adaptive control to grid entry point voltage reduces influence of the distributed photovoltaic power generation to network voltage.
6, technical solution provided by the invention, is widely used, and has significant Social benefit and economic benefit.
Detailed description of the invention
Fig. 1 is a kind of flow chart of distributed photovoltaic power generation Poewr control method based on virtual power plant of the invention；
Fig. 2 is the flow diagram of the step 3 of control method of the invention；
Fig. 3 is the flow diagram of the step 5 of control method of the invention；
Fig. 4 is the flow diagram of the step 6 of control method of the invention；
Fig. 5 is the signal of the application examples of the distributed photovoltaic power generation Poewr control method of the invention based on virtual power plant
Figure；
Fig. 6 is the distributed photovoltaic power generation unit active power controller signal in the application examples of control method of the invention
Figure；
Fig. 7 is distributed photovoltaic power generation P-V curve and V in the application examples of control method of the inventionpv,max, Vpv,min
Schematic diagram；
Fig. 8 is the REACTIVE POWER/VOLTAGE CONTROL side of the distributed photovoltaic power generation unit in the application examples of control method of the invention
The schematic diagram of method.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
The embodiment of the present invention, every other reality obtained by those of ordinary skill in the art without making creative efforts
Example is applied, shall fall within the protection scope of the present invention.
As shown in Figure 1, the present invention provides a kind of distributed photovoltaic power generation Poewr control method based on virtual power plant, side
Method realizes that control system includes virtual power plant control centre and distributed light by distributed photovoltaic power generation power control system
Generator unit is lied prostrate locally to control；Virtual power plant control centre and power grid regulation center interconnect, and with each distributed photovoltaic
Generator unit carries out data transmission in wireless public network；
Method includes the following steps:
Step 1. is in a scheduling slot；Virtual power plant control centre receives each distributed photovoltaic power generation unit and sends
Real-time traffic information, real-time traffic information include active power output, reactive power output, active power adjustable extent,
Active power regulation range and node voltage；
Step 2. virtual power plant control centre receives the active power to virtual power plant that power grid regulation center is assigned
The node voltage reference value of dispatch command and each distributed photovoltaic access point；
Step 3. virtual power plant control centre abandons light cost minimization as the active of target according to using entire virtual power plant
Power optimization scheduling model obtains the active power dispatch command of each distributed photovoltaic power generation unit；
Step 4. virtual power plant control centre to each distributed photovoltaic power generation unit send active power dispatch command and
Node voltage reference value；
Each distributed photovoltaic power generation unit of step 5. has its own according to the active power dispatch command received
Function power control；
Step 6. calculates the reactive power adjustable extent of distributed photovoltaic power generation unit and the node received electricity in real time
Reference value is pressed, adaptive reactive power/voltage control is carried out；
Each distributed photovoltaic power generation unit of step 7. sends the real time execution letter after control to virtual power plant control centre
Breath；
Step 8. virtual power plant control centre assesses the active power regulation model of next scheduling slot virtual power plant
It encloses, and assessment result is sent to power grid regulation center, the active power tune of next scheduling slot is assigned at power supply network regulation center
Degree instruction.
As shown in Fig. 2, step 3 includes:
3-1. is established using the abandoning light cost minimization of virtual power plant as the active power Optimal Operation Model of target；
The objective function of scheduling model are as follows:
3-2. solves scheduling model, obtains having for each distributed photovoltaic power generation unit under the constraint condition of scheduling model
The instruction of function power dispatching, the i.e. disaggregation of objective function；
Wherein, constraint condition are as follows:
In formula,It indicates the active power dispatch command of distributed photovoltaic power generation unit i, becomes for the optimization of the model
Amount；PVPPFor the active power dispatch command for the entire virtual power plant that power grid regulation center is assigned；NPIt indicates in virtual power plant
Distributed photovoltaic power generation unit number；Indicate the abandoning light cost of distributed photovoltaic power generation unit i；For distributed light
Lie prostrate the maximum power generation of generator unit i；For the minimum generated output of distributed photovoltaic power generation unit i, wherein0 < α < 1.
As shown in figure 3, step 5 includes:
The received active power dispatch command of each distributed photovoltaic power generation unit of 5-1.；
The active power output valve P of each distributed photovoltaic power generation unit of 5-2. real-time measurementpv；
Each distributed photovoltaic power generation unit of 5-3. carries out active power controller, i.e., by active power output valve PpvWith wattful power
Rate dispatch command Ppv,EDDifference power is constituted, and difference power is made to obtain accounting for for gird-connected inverter Boost circuit by PI controller
Sky ratio D, PI controlling unit is equipped with output upper limit DmaxWith bottoming Dmin。
Wherein, the output upper limit D in 5-3maxWith bottoming DminValue are as follows:
In formula, VOFor the voltage of gird-connected inverter DC bus；Vpv,maxFor the photovoltaic battery array DC voltage upper limit；
Vpv,minFor photovoltaic battery array DC voltage lower limit.
Wherein, photovoltaic battery array DC voltage upper limit Vpv,maxAnd photovoltaic battery array DC voltage lower limit Vpv,minAsk
Take process are as follows:
A. the intensity of illumination and temperature in real-time measurement environmental variance；
B. according to intensity of illumination and temperature, the P-V curve of distributed photovoltaic power generation unit is obtained；
C. on P-V curve, the maximum power point P of distributed photovoltaic power generation unit is obtainedpv,maxAnd corresponding light
Lie prostrate cell array DC voltage upper limit Vpv,max；
D. basisAnd 0 < α < 1, obtain the minimum power point P of distributed photovoltaic power generation unitpv,min
And corresponding photovoltaic battery array DC voltage lower limit Vpv,min。
As shown in figure 4, step 6, comprising:
6-1. calculates distributed photovoltaic power generation unit reactive power adjustable extent in real time, that is, distributed photovoltaic is calculated
The reactive power of generator unit i exports maximum valueAnd minimum value
6-2. is according to reactive power adjustable extent and the node voltage reference value received and the node voltage received
Reference value Vpv,ref, calculate sagging slope k:
6-3. calculates reactive power and instructs Qpv:
Work as Vpv≤min(Vpcc,max,βVpv,ref) and Vpv≥max(Vpcc,min,θVpv,ref) when,
Work as Vpv≥min(Vpcc,max,βVpv,ref) when,
Qpv=Qpv,min；
Work as Vpv≤max(Vpcc,min,θVpv,ref) when,
Qpv=Qpv,max；
In formula, Vpcc,maxFor the distributed photovoltaic power generation unit grid entry point upper voltage limit；Vpcc,minFor institute's distributed photovoltaic
Generator unit grid entry point lower voltage limit；β and θ is voltage regulation limits coefficient, generally takes 1 < β≤1.05,0.95≤θ < 1；Vpv
For the current distributed photovoltaic power generation unit grid entry point voltage value.
Wherein, step 6-1, comprising:
The reactive power for calculating distributed photovoltaic power generation unit i in real time exports maximum valueAnd minimum value
In formula,Maximum value is exported for the reactive power of distributed photovoltaic power generation unit i；For distributed light
The reactive power for lying prostrate generator unit i exports minimum value；For the gird-connected inverter rated capacity of distributed photovoltaic power generation unit i；It is exported for the real-time active power of distributed photovoltaic power generation unit i.
The all information transmitted between virtual power plant control centre and distributed photovoltaic power generation unit passes through data letter
Encryption for information processing.
Each scheduling slot when it is 5 to 15 minutes a length of.
As shown in figure 5, application examples of the invention provides a kind of distributed photovoltaic power generation power control based on virtual power plant
Method processed, method realize that control system includes virtual power plant control centre by distributed photovoltaic power generation power control system
With distributed photovoltaic power generation unit；Virtual power plant control centre and power grid regulation center interconnect, and with each distributed light
Volt generator unit carries out data transmission in wireless public network；
It wherein, is 5 minutes primary to adjust the period in the application examples；α=0.8；Illustrate for β=1.05 and θ=0.95
This method；
Include the following steps:
(1) in virtual power plant control centre, the real-time traffic information that each distributed photovoltaic power generation unit is sent is received, packet
It includes: active power output, reactive power output, active power adjustable extent, active power regulation range and node voltage.
(2) in virtual power plant control centre, the virtual power plant active power scheduling assigned at power grid regulation center is received
The node voltage reference value of instruction and each distributed photovoltaic access point, receiving the period is every 5 minutes 1 time.
(3) it in virtual power plant control centre, establishes and solves and light cost minimization is abandoned as target using entire virtual power plant
Active power Optimal Operation Model, obtain the active power dispatch command of each distributed photovoltaic power generation unit, meet power grid tune
The virtual power plant active power dispatch command and each distributed photovoltaic power generation unit active power regulation model that control center is assigned
Enclose constraint.Active power Optimal Operation Model are as follows:
Objective function:
Constraint condition:
Wherein:
The active power dispatch command of distributed photovoltaic power generation unit i is indicated, for the optimized variable of the model；PVPP
For the active power dispatch command for the entire virtual power plant that power grid regulation center is assigned；NPIndicate the distribution in virtual power plant
Formula photovoltaic generation unit number；Indicate the abandoning light cost of distributed photovoltaic power generation unit i；To predict obtained distribution
The maximum power generation of formula photovoltaic generation unit i；For the minimum generated output of distributed photovoltaic power generation unit i, generally set
It is fixed
(4) in virtual power plant control centre, to each distributed photovoltaic power generation unit send active power dispatch command and
Node voltage reference value.
(5) local in each distributed photovoltaic power generation unit, receive the active power tune that virtual power plant control centre assigns
Degree instruction and node voltage reference value.
(6) as shown in fig. 6, it is local in each distributed photovoltaic power generation unit, the active power dispatch command that foundation receives,
Carry out active power controller；The active power of real-time measurement distributed photovoltaic power generation unit exports Ppv, dispatched with active power
Instruct Ppv,EDDifference obtain the duty ratio D of gird-connected inverter Boost circuit by PI controlling unit.PI controlling unit is equipped with output
Bound Dmax, Dmin, value is,
Wherein, VOFor the voltage of gird-connected inverter DC bus；Vpv,max, Vpv,minFor on photovoltaic battery array DC voltage
Lower limit.
Vpv,max, Vpv,minCalculation method as shown in fig. 7, the environmental variances such as intensity of illumination, temperature according to real-time measurement,
The P-V curve of distributed photovoltaic power generation unit is obtained, to obtain the maximum power point P of distributed photovoltaic power generation unitpv,maxWith
And corresponding voltage Vpv,max, then according to the P of settingpv,min=0.8Ppv,max, obtain distributed photovoltaic power generation unit
Minimum power point Ppv,minAnd its corresponding voltage Vpv,min。
(7) local in each distributed photovoltaic power generation unit, it is adjustable that distributed photovoltaic power generation unit reactive power is calculated in real time
Adjusting range:
Wherein:
Maximum value is exported for the reactive power of distributed photovoltaic power generation unit i；For distributed photovoltaic power generation
The reactive power of unit i exports minimum value；For the gird-connected inverter rated capacity of distributed photovoltaic power generation unit i；For
The real-time active power of distributed photovoltaic power generation unit i exports；
As shown in figure 8, simultaneously carrying out REACTIVE POWER/VOLTAGE CONTROL according to the node voltage reference value received.According to real-time measurement
Node voltage value calculate distributed photovoltaic power generation unit reactive power instruction.In figure: Vpv,refFor the node voltage received
Reference value；Vpcc,maxFor grid entry point upper voltage limit；Vpcc,minFor grid entry point lower voltage limit；VpvFor the current distributed photovoltaic
Generator unit grid entry point voltage value.
Sagging slope is calculated by following formula,
The calculation method of reactive power instruction is as follows,
Work as Vpv≤min(Vpcc,max,1.05Vpv,ref) and Vpv≥max(Vpcc,min,0.95Vpv,ref) when,
Work as Vpv≥min(Vpcc,max,0.95Vpv,ref) when,
Qpv=Qpv,min；
Work as Vpv≤max(Vpcc,min,0.95Vpv,ref) when,
Qpv=Qpv,max；
(8) local in each distributed photovoltaic power generation unit, next scheduling slot is sent to virtual power plant control centre
Active power regulation range.
(9) in virtual power plant control centre, the active power regulation of the entire virtual power plant of next scheduling slot is assessed
Range, and it is sent to power grid regulation center, so that dispatch command is assigned at power grid regulation center.
The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, although referring to above-described embodiment pair
The present invention is described in detail, those of ordinary skill in the art still can to a specific embodiment of the invention into
Row modifies perhaps equivalent replacement and these exist without departing from any modification of spirit and scope of the invention or equivalent replacement
Apply within pending claims of the invention.
Claims (9)
1. a kind of distributed photovoltaic power generation Poewr control method based on virtual power plant, which is characterized in that the method passes through
Distributed photovoltaic power generation power control system realizes that the control system includes virtual power plant control centre and distributed photovoltaic
Generator unit locally controls；The virtual power plant control centre and power grid regulation center interconnect, and with each distributed light
Volt generator unit carries out data transmission in wireless public network；
Described method includes following steps:
Step 1. is in a scheduling slot；The virtual power plant control centre receives each distributed photovoltaic power generation unit
The real-time traffic information of transmission, the real-time traffic information includes active power output, reactive power output, reactive power is adjustable
Adjusting range, active power regulation range and node voltage；
Virtual power plant control centre described in step 2. receive that the power grid regulation center assigns to the active of virtual power plant
The node voltage reference value of power dispatching instruction and each distributed photovoltaic access point；
Virtual power plant control centre described in step 3. abandons light cost minimization as target according to using the entire virtual power plant
Active power Optimal Operation Model obtains the active power dispatch command of each distributed photovoltaic power generation unit；
Virtual power plant control centre described in step 4. sends the active power tune to each distributed photovoltaic power generation unit
Degree instruction and the node voltage reference value；
Each distributed photovoltaic power generation unit of step 5. according to the active power dispatch command received to its own into
Row active power controller；
Step 6. calculates the reactive power adjustable extent of distributed photovoltaic power generation unit and the node received electricity in real time
Reference value is pressed, adaptive reactive power/voltage control is carried out；
Each distributed photovoltaic power generation unit described in step 7. sends the real-time fortune after control to virtual power plant control centre
Row information；
Virtual power plant control centre described in step 8. assesses the wattful power of virtual power plant described in next scheduling slot
Rate adjustable range, and assessment result is sent to power grid regulation center, next scheduling slot is assigned for the power grid regulation center
The active power dispatch command.
2. the method as described in claim 1, which is characterized in that the step 3 includes:
3-1. is established using the abandoning light cost minimization of the virtual power plant as the active power Optimal Operation Model of target；
The objective function of the scheduling model are as follows:
3-2. solves the scheduling model under the constraint condition of the scheduling model, obtains each distributed photovoltaic power generation
The active power dispatch command of unit, i.e., the disaggregation of the described objective function；
Wherein, the constraint condition are as follows:
In formula,The active power dispatch command of distributed photovoltaic power generation unit i is indicated, for the optimized variable of the model；PVPP
For the active power dispatch command for the entire virtual power plant that power grid regulation center is assigned；NPIndicate the distribution in virtual power plant
Formula photovoltaic generation unit number；Indicate the abandoning light cost of distributed photovoltaic power generation unit i；For the distributed photovoltaic
The maximum power generation of generator unit i；For the minimum generated output of distributed photovoltaic power generation unit i, wherein
3. method according to claim 2, which is characterized in that the step 5 includes:
Each received active power dispatch command of distributed photovoltaic power generation unit of 5-1.；
The active power output valve P of each distributed photovoltaic power generation unit of 5-2. real-time measurementpv；
Each distributed photovoltaic power generation unit of 5-3. carries out active power controller, i.e., by the active power output valve PpvAnd have
Function power dispatching instructs Ppv,EDDifference power is constituted, and the difference power is made to obtain gird-connected inverter Boost by PI controller
The duty ratio D of circuit, the PI controlling unit are equipped with output upper limit DmaxWith bottoming Dmin。
4. method as claimed in claim 3, which is characterized in that the output upper limit D in the 5-3maxAnd bottoming
DminValue are as follows:
In formula, VOFor the voltage of gird-connected inverter DC bus；Vpv,maxFor the photovoltaic battery array DC voltage upper limit；Vpv,minFor
Photovoltaic battery array DC voltage lower limit.
5. method as claimed in claim 4, which is characterized in that the photovoltaic battery array DC voltage upper limit Vpv,maxAnd institute
State photovoltaic battery array DC voltage lower limit Vpv,minFinding process are as follows:
A. the intensity of illumination and temperature in real-time measurement environmental variance；
B. according to the intensity of illumination and temperature, the P-V curve of the distributed photovoltaic power generation unit is obtained；
C. on the P-V curve, the maximum power point P of the distributed photovoltaic power generation unit is obtainedpv,maxAnd it is corresponding
The photovoltaic battery array DC voltage upper limit Vpv,max；
D. basisAnd 0 < α < 1, obtain the minimum power point P of distributed photovoltaic power generation unitpv,minAnd
The corresponding photovoltaic battery array DC voltage lower limit Vpv,min。
6. method as claimed in claim 5, which is characterized in that the step 6, comprising:
6-1. calculates distributed photovoltaic power generation unit reactive power adjustable extent in real time, that is, the distributed photovoltaic is calculated
The reactive power of generator unit i exports maximum valueAnd minimum value
6-2. is according to reactive power adjustable extent and the node voltage reference value received and the node received
Voltage reference value Vpv,ref, calculate sagging slope k:
6-3. calculates the reactive power and instructs Qpv:
Work as Vpv≤min(Vpcc,max,βVpv,ref) and Vpv≥max(Vpcc,min,θVpv,ref) when,
Work as Vpv≥min(Vpcc,max,βVpv,ref) when,
Qpv=Qpv,min；
Work as Vpv≤max(Vpcc,min,θVpv,ref) when,
Qpv=Qpv,max；
In formula, Vpcc,maxFor the distributed photovoltaic power generation unit grid entry point upper voltage limit；Vpcc,minFor distributed photovoltaic hair
Electric unit grid entry point lower voltage limit；β and θ is voltage regulation limits coefficient, generally takes 1 < β≤1.05,0.95≤θ < 1；VpvFor
The current distributed photovoltaic power generation unit grid entry point voltage value.
7. method as claimed in claim 6, which is characterized in that the step 6-1 includes:
The reactive power for calculating distributed photovoltaic power generation unit i in real time exports maximum valueAnd minimum value
In formula,Maximum value is exported for the reactive power of distributed photovoltaic power generation unit i；For distributed photovoltaic power generation
The reactive power of unit i exports minimum value；For the gird-connected inverter rated capacity of distributed photovoltaic power generation unit i；For
The real-time active power of distributed photovoltaic power generation unit i exports.
8. the method as described in claim 1, which is characterized in that the virtual power plant control centre and the distributed photovoltaic
The all information transmitted between generator unit passes through data information encryption.
9. the method as described in claim 1, which is characterized in that each scheduling slot when it is 5 to 15 minutes a length of.
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| CN114928101B (en) * | 2022-05-05 | 2024-04-19 | 国网江苏省电力有限公司镇江供电分公司 | Active power control method for synchronous support of optical storage virtual power plant |
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