CN109524970B - Distributed optical storage system-based power distribution network voltage control system and method - Google Patents
Distributed optical storage system-based power distribution network voltage control system and method Download PDFInfo
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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 relates to a power distribution network voltage control system and method based on a distributed optical storage system, comprising a photovoltaic cell panel, a photovoltaic DC/DC converter, a direct current side capacitor, an energy storage battery pack, an energy storage DC/DC converter, an energy storage DC/DC conversion controller and an optical storage DC/AC converter, wherein the input end of the photovoltaic DC/DC converter is connected with the cell panel, the output end of the photovoltaic DC/DC converter is connected with the input end of the optical storage DC/AC converter through the direct current side capacitor, the output end of the optical storage DC/AC converter is connected with the power distribution network through a filter, the input end of the energy storage DC/DC converter is connected with the battery pack, and the output end of the energy storage DC/DC converter is connected with the input end of the optical storage DC/AC converter. The invention can effectively control the voltage of the power distribution network and solve the problem of voltage out-of-limit caused by the large-scale distributed optical storage system after the power distribution network is accessed.
Description
Technical Field
The invention relates to the field of power distribution networks, in particular to a power distribution network voltage control system and method based on a distributed optical storage system.
Background
The light storage system connected into the power distribution network mainly comprises a photovoltaic cell panel, a photovoltaic DC/DC converter, a direct-current side capacitor, an energy storage battery pack, an energy storage DC/DC converter and a light storage DC/AC converter. At present, the voltage control of the power distribution network based on the optical storage system is realized by controlling the reactive power of the optical storage DC/AC converter, and the method is widely applied. In the method, a reactive power reference value and a reactive power detection value are differenced, and a q-axis current reference value is generated after passing through a reactive power controller. And (3) making a difference between the q-axis current reference value and the q-axis current detection value, and generating a q-axis output voltage after the q-axis current reference value and the q-axis current detection value pass through a q-axis current controller. The optical storage DC/AC converter outputs corresponding reactive power according to the q-axis output voltage. When the voltage of the power distribution network changes, the errors of the reactive power reference value and the reactive power detection value also change, the q-axis output voltage changes according to the errors, and the optical storage DC/AC converter regulates reactive power output according to the q-axis output voltage, so that the voltage of the power distribution network is stabilized.
A control method of an optical storage micro-grid-connected power generation system is disclosed in chinese patent CN 104810858A. And according to the grid-connected point voltage drop condition of the DC-AC grid-connected inverter and the reactive power demand set value of the power grid, the grid-connected point voltage is stabilized through reactive power control of the DC-AC grid-connected inverter. In US patent US 20100156186 A1 a photovoltaic fuel cell integrated power generation system is disclosed, which uses reactive power control of a photovoltaic grid-connected inverter to stabilize grid-connected point voltage.
The method for stabilizing the grid-connected point voltage through the reactive power control of the DC-AC grid-connected inverter has limitations when a distributed optical storage system is widely connected into a power distribution network, the dynamic characteristics of the control system are poor, and the control effect is affected. On the one hand, the reactive power instruction value cannot be a constant value, and is changed along with the change of the voltage of the grid-connected point, so that the problem of accurately and timely obtaining the reactive power instruction value is solved; on the other hand, the voltage of the grid-connected point is not only related to reactive power, but also related to active power, and the change of the active power in the power distribution network can influence the voltage of the node. Accordingly, there is a need in the related art to seek more sophisticated control methods to solve this practical problem.
Disclosure of Invention
The invention aims to provide a power distribution network voltage control system and method based on a distributed optical storage system, which can effectively adjust the voltage and prevent the voltage from exceeding the limit so as to improve the stability of the power distribution network voltage and the running stability of the optical storage grid-connected system.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the power distribution network voltage control system based on the distributed optical storage system comprises a photovoltaic cell panel, a photovoltaic DC/DC converter, a direct current side capacitor, an energy storage battery pack, an energy storage DC/DC converter, an energy storage DC/DC conversion controller and an optical storage DC/AC converter, wherein the input end of the photovoltaic DC/DC converter is connected with the cell panel, the output end of the photovoltaic DC/DC converter is connected with the input end of the optical storage DC/AC converter through the direct current side capacitor, the output end of the optical storage DC/AC converter is connected with the power distribution network through a filter, the input end of the energy storage DC/DC converter is connected with the battery pack, and the output end of the energy storage DC/DC converter is connected with the input end of the optical storage DC/AC converter;
the input end of the energy storage DC/DC conversion controller is connected with the output end of the battery pack, the output end of the battery panel and the power distribution network, the output end of the energy storage DC/DC conversion controller is connected with the control end of the energy storage DC/DC converter and is used for detecting voltage and current signals output by the photovoltaic battery panel, voltage and current signals output by the energy storage battery pack and three-phase voltage signals of the power distribution network, and an energy storage driving signal is formed after signal processing so as to regulate the energy storage DC/DC converter;
the input end of the light storage DC/AC conversion controller is connected with the power distribution network and the direct current side capacitor, the output end of the light storage DC/AC conversion controller is connected with the control end of the light storage DC/AC converter and used for detecting direct current side capacitor voltage signals and three-phase voltage and current signals of the power distribution network, and the light storage inversion driving signals are formed after calculation and processing to regulate the light storage DC/AC converter.
As a further improvement of the above technical scheme:
the energy storage DC/DC conversion controller comprises a power distribution network voltage amplitude calculator, a photovoltaic cell panel output active power calculator, an energy storage battery pack output active power calculator, a V/P sagging controller, a first subtracter, a second subtracter and a proportional integrator;
the input end of the power distribution network voltage amplitude calculator is connected with the power distribution network, the input end of the photovoltaic cell panel output active power calculator is connected with the output end of the battery panel, the input end of the energy storage battery pack output active power calculator is connected with the output end of the battery pack, the output end of the power distribution network voltage amplitude calculator is connected with the input end of the V/P droop controller, the output ends of the V/P droop controller and the photovoltaic cell panel output active power calculator are connected with the input end of the first subtracter, the output ends of the first subtracter and the energy storage battery pack output active power calculator are connected with the input end of the second subtracter, the output end of the second subtracter is connected with the input end of the proportional integrator, and the output end of the proportional integrator is connected with the control end of the energy storage DC/DC converter.
The power grid voltage amplitude calculator is used for collecting three-phase voltage signals of the power distribution network in real time and calculating to obtain voltage amplitude signals of the power distribution network; the V/P droop controller is used for receiving the voltage amplitude signal of the power distribution network and obtaining an active power reference signal of the optical storage system through droop calculation and signal processing; the photovoltaic cell panel output active power calculator is used for collecting photovoltaic cell panel output voltage and current signals in real time and obtaining photovoltaic cell panel output active power signals through calculation; the energy storage battery pack output active power calculator is used for collecting output voltage and current signals of the energy storage battery pack in real time and obtaining the output active power signals of the energy storage battery pack through calculation; the first subtracter is used for receiving the active power reference signal of the optical storage system and the active power signal output by the photovoltaic cell panel, and obtaining an active power reference signal of the energy storage battery pack through operation; the second subtracter is used for receiving the active power reference signal of the energy storage battery pack and the active power signal output by the energy storage battery pack, and obtaining an active power error signal of the energy storage battery pack through operation; the proportional integrator is used for receiving the active power error signal of the energy storage battery pack and obtaining a DC/DC converter driving signal through operation.
Further, the V/P droop controller comprises an active power upper limit controller, an active power upper segment droop controller, an active clamp controller, an active power lower segment droop controller, an active power lower limit controller and a first adder; the input ends of the active power upper limit controller, the active power upper section droop controller, the active clamp controller, the active power lower section droop controller and the active power lower limit controller are connected with the output end of the power distribution network voltage amplitude calculator, the output ends of the active power upper limit controller, the active power upper section droop controller, the active clamp controller and the active power lower section droop controller are connected with the input end of a first adder, and the output end of the first adder is connected with the input end of a first subtracter;
the active power upper limit controller is used for collecting a voltage amplitude signal of the power distribution network, and if the voltage amplitude signal is smaller than or equal to V min Then output the active power reference signal P max If the signal is greater than V max The output is 0; the active power upper section sagging controller is used for collecting a voltage amplitude signal of the power distribution network, and if the signal is larger than V min And is less than or equal to V 1 According to the V/P sag characteristic curveOutputting an active power reference signal P 1 Otherwise, the output is 0; the active clamp controller is used for collecting voltage amplitude signals of the power distribution network in real time, and if the voltage amplitude signals are larger than V 1 And is less than or equal to V 2 Then a constant active power reference signal P is output o Otherwise, the output is 0; the active power lower section droop controller is used for collecting a voltage amplitude signal of the power distribution network, if the signal is greater than V 2 And is less than or equal to V max Outputting an active power reference signal P according to the V/P droop characteristic 2 Otherwise, the output is 0; the active power lower limit controller is used for collecting a voltage amplitude signal of the power distribution network, and if the signal is greater than V max Then output the active power reference signal P min Otherwise, the output is 0; the first adder is configured to receive output signals of the active power upper limit controller, the active power upper segment droop controller, the active clamp controller, the active power lower segment droop controller, and the active power lower limit controller, and perform addition calculation to obtain an active power reference signal of the optical storage system.
In the above scheme, the active power reference signal P max As the maximum active reference signal, the active power reference signal P min Is the minimum active reference signal; said voltage V min Set to 0.9 times of rated voltage value, voltage V max Setting the rated voltage value to be 1.1 times; the V/P sagging characteristic curve is an asymmetric sagging curve, and the active power difference value P max -P o Greater than the active power difference P o -P min 。
Further, the optical storage DC/AC conversion controller comprises a direct current voltage controller, a reactive power controller, a current controller, a phase-locked loop and a DC/AC conversion driving signal generator;
the input end of the direct current voltage controller is connected in parallel with the two ends of the direct current side capacitor, the input end of the reactive power controller is connected with the power distribution network, the output ends of the direct current voltage controller and the reactive power controller are connected with the input end of the current controller, the output end of the current controller is connected with the input end of the DC/AC conversion driving signal generator, the output end of the DC/AC conversion driving signal generator is connected with the control end of the light storage DC/AC converter, the input end of the phase-locked loop is connected with the input end of the reactive power controller, and the output end of the phase-locked loop is connected with the input end of the current controller.
The direct-current voltage controller is used for receiving a direct-current capacitor voltage signal and a direct-current voltage reference signal and outputting a d-axis current reference signal through calculation; the reactive power controller is used for receiving three-phase voltage and current signals of the power distribution network and obtaining a q-axis current reference signal through calculation; the phase-locked loop is used for receiving three-phase voltage signals of the power distribution network and calculating to obtain voltage phase signals; the current controller is used for receiving a d-axis current reference signal, a q-axis current reference signal, a three-phase current signal and a voltage phase signal of the power distribution network, and obtaining a modulation signal through calculation; the DC/AC conversion driving signal generator is used for obtaining a driving signal according to the received modulation signal and transmitting the driving signal to the optical storage DC/AC converter. The reactive power controller comprises a voltage amplitude calculator, a V/Q droop controller, a reactive power calculator, a third subtracter and a proportional integrator; the voltage amplitude calculator is used for receiving three-phase voltage signals of the power distribution network and obtaining voltage amplitude signals through calculation; the V/Q droop controller is used for receiving the voltage amplitude signal and calculating a reactive power reference signal through a V/Q droop characteristic curve; the reactive power calculator is used for receiving three-phase voltage and current signals of the power distribution network and obtaining reactive power signals through calculation; the third subtracter is used for receiving the reactive power reference signal and the reactive power signal, and subtracting the reactive power reference signal and the reactive power signal to obtain a reactive power error value; the proportional integrator is used for receiving the reactive power error value and obtaining a q-axis current reference signal through calculation and processing.
Further, the V/Q droop controller includes a reactive power upper limit controller, a reactive power upper segment droop controller, a reactive clamping controller, a reactive power lower segment droop controller, a reactive power lower limit controller, and a second adder, input ends of the reactive power upper limit controller, the reactive power upper segment droop controller, the reactive clamping controller, the reactive power lower segment droop controller, and the reactive power lower limit controller are all connected with an output end of the voltage amplitude calculator, an output end of the reactive power upper segment droop controller, the reactive power lower segment droop controller are all connected with an input end of the second adder, and an output end of the second adder is connected with an input end of the third subtractor.
A power distribution network voltage control method based on a distributed optical storage system comprises the following steps:
(1) Converting the direct-current voltage output by the battery plate into high direct-current voltage through a photovoltaic DC/DC converter, and storing the converted electric energy through a direct-current side capacitor;
(2) The energy storage DC/DC converter is used for absorbing the electric energy of the capacitor at the direct current side, the light storage DC/AC converter is used for converting the direct current voltage output by the photovoltaic DC/DC converter into alternating current voltage, and the alternating current voltage is input to the power distribution network after filtering;
(3) Output voltage U of photovoltaic cell panel is acquired in real time through energy storage DC/DC conversion controller cell And current signal I cell Output voltage U of energy storage battery pack pv And current signal I pv Three-phase voltage signal u of power distribution network 18 ta 、u tb 、u tc Forming an energy storage driving signal after signal processing, and executing control on the energy storage DC/DC converter;
(4) Collecting direct-current side capacitance voltage signals Udc and three-phase voltage u of power distribution network 18 in real time through optical storage DC/AC conversion controller ta 、u tb 、u tc And a current signal i a 、i b 、i c And performing a control process of the optical storage DC/AC converter by calculating and processing to form an optical storage inversion driving signal.
According to the technical scheme, the reactive power output by the light storage DC/AC converter is controlled through the V/Q sagging characteristic curve, the purpose of stabilizing the voltage of the power distribution network is achieved, and the energy storage DC/DC converter is controlled through the V/P sagging characteristic curve to send or absorb active power, so that the purpose of further stabilizing the voltage of the power distribution network is achieved. Therefore, the voltage can be controlled by fully utilizing the influence rule of the change of active power and reactive power on the voltage of the power distribution network, and the out-of-limit voltage of the power distribution network can be effectively restrained, and the voltage stability is improved.
Drawings
FIG. 1 is a schematic diagram of the principle and structure of a distributed optical storage system of the power distribution network of the present invention;
FIG. 2 is a schematic diagram of the principle and structure of the energy storage DC/DC conversion controller of the present invention;
FIG. 3 is a schematic diagram of the principle structure of the V/P droop controller according to the present invention;
FIG. 4 is a schematic diagram of the principle and structure of the optical storage DC/AC conversion controller of the present invention;
fig. 5 is a schematic diagram of the principle structure of the reactive power controller of the present invention;
fig. 6 is a schematic diagram of the principle structure of the V/Q droop controller according to the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
as shown in fig. 1, the voltage control system for a power distribution network based on a distributed optical storage system of this embodiment includes a photovoltaic panel 11 for converting solar energy into electric energy, a photovoltaic DC/DC converter 12 for converting direct-current voltage into higher direct-current voltage, a capacitor 13 for storing electric energy on a direct-current side, an energy storage battery pack 15 for storing or releasing electric energy, an energy storage DC/DC converter 16 for absorbing electric energy of the capacitor on the direct-current side or discharging electric energy externally, an optical storage DC/AC converter 14 for converting direct-current voltage into alternating-current voltage, a filter 17 for filtering the output alternating-current voltage, and a power distribution network 18. The input end of the photovoltaic DC/DC converter 12 is connected with the photovoltaic cell panel 11, the output end of the photovoltaic DC/DC converter 12 is connected with the input end of the light storage DC/AC converter 14 through the direct current side capacitor 13, the output end of the light storage DC/AC converter 14 is connected with the power distribution network 18 through the filter 17, the input end of the energy storage DC/DC converter 12 is connected with the battery pack 15, and the output end of the energy storage DC/DC converter 12 is connected with the input end of the light storage DC/AC converter 14.
The energy storage DC/DC conversion controller 3 is used for collecting the output voltage U of the photovoltaic cell panel 11 in real time cell And current signal I cell Output voltage U of energy storage battery pack 15 pv And current signal I pv Three-phase voltage signal u of power distribution network 18 ta 、u tb 、u tc The stored energy driving signal 30 is formed after the signal processing, and then a control process of the stored energy DC/DC converter 16 is performed.
The optical storage DC/AC conversion controller 2 is used for collecting the direct-current side capacitance voltage signal U in real time dc Three-phase voltage u of power distribution network 18 ta 、u tb 、u tc And a current signal i a 、i b 、i c The optical storage inversion driving signal 20 is formed by calculation and processing, and then a control process of the optical storage DC/AC converter 14 is performed.
As shown in fig. 2, the energy storage DC/DC conversion controller 3 includes a distribution network voltage amplitude calculator 31, a photovoltaic panel output active power calculator 36, an energy storage battery pack output active power calculator 37, a V/P droop controller 32, a subtractor 33, a subtractor 34, and a proportional integrator 35.
The input end of the distribution network voltage amplitude calculator 31 is connected with the distribution network 18, the input end of the photovoltaic cell panel output active power calculator 36 is connected with the output end of the battery panel 11, the input end of the energy storage battery pack output active power calculator 36 is connected with the output end of the battery pack 15, the output end of the distribution network voltage amplitude calculator 31 is connected with the input end of the V/P droop controller 32, the output end of the V/P droop controller 32 and the photovoltaic cell panel output active power calculator 36 are connected with the input end of the subtracter 33, the output ends of the subtracter 33 and the energy storage battery pack output active power calculator 37 are connected with the input end of the subtracter 34, the output end of the subtracter 34 is connected with the input end of the proportional integrator 35, and the output end of the proportional integrator 35 is connected with the control end of the energy storage DC/DC converter 16.
Wherein, the power grid voltage amplitude calculator 31 is used for collecting three-phase voltage signals u of the power distribution network in real time ta 、u tb 、u tc And calculating a power distribution network voltage amplitude signal 310 based on the acquired value; the V/P droop controller 32 receives the power distribution network voltage amplitude signal 310, performs droop calculation and signal processing to obtain an active power reference signal 320 of the optical storage system; the photovoltaic cell panel output active power calculator 36 is used for collecting photovoltaic cell panel output voltage U in real time pv And current I pv Signals are obtained by calculation based on the acquired valuesThe photovoltaic panel outputs an active power signal 360; the energy storage battery pack output active power calculator 37 is used for collecting the energy storage battery pack output voltage U in real time cell And current I cell The signal, and get the energy storage battery pack output active power signal 370 through calculating based on the collection value; the first subtracter 33 receives the active power reference signal 320 of the optical storage system and the active power signal 360 output by the photovoltaic cell panel, and obtains an active power reference signal 330 of the energy storage battery pack through subtraction operation; the second subtractor 34 receives the energy storage battery active power reference signal 330 and the energy storage battery output active power signal 370, and obtains an energy storage battery active power error signal 340 through subtraction; the proportional integrator 35 receives the energy storage battery active power error signal 340 and obtains the drive signal 30 through a proportional integration operation to drive the energy storage DC/DC converter 16.
As shown in fig. 3, the V/P droop controller 32 includes an active power upper limit controller 321, an active power upper droop controller 322, an active clamp controller 323, an active power lower droop controller 324, an active power lower limit controller 325, and an adder 3251. The upper active power limit controller 321, the upper active power droop controller 322, the active clamp controller 323, the lower active power droop controller 324 and the lower active power limit controller 325 are all connected with the input end of an adder 3251, and the output end of the adder 3251 is connected with the input end of a subtracter 33;
wherein, the active power upper limit controller 321 collects the voltage amplitude signal 310 of the distribution network in real time, if the signal is less than or equal to V min The active power upper limit controller 321 outputs an active power reference signal P max If the signal is greater than V max The active power upper limit controller 321 outputs 0; the active power upper sag controller 322 collects the distribution network voltage amplitude signal 310 in real time if the signal is greater than V min And is less than or equal to V 1 The active power upper droop controller 322 outputs the active power reference signal P according to the V/P droop characteristic 1 Otherwise, the output is 0; the active clamp controller 323 collects the distribution network voltage amplitude signal 310 in real time if the signal 310 is greater than V 1 And is smaller thanOr equal to V 2 The active clamp controller 323 outputs a constant active power reference signal P o Otherwise, the output is 0; the active power sag controller 324 collects the distribution network voltage amplitude signal 310 in real time if the signal 310 is greater than V 2 And is less than or equal to V max The active power droop controller 324 outputs the active power reference signal P according to the V/P droop characteristic 2 Otherwise, the output is 0; the active power lower limit controller 325 collects the distribution network voltage amplitude signal 310 in real time if the signal 310 is greater than V max The active power lower limit controller 325 outputs the active power reference signal P min . Adder 3251 is configured to receive output signals 326, 327, 328, 329 and 3250 from upper active power limit controller 321, upper active power droop controller 322, active clamp controller 323, lower active power droop controller 324 and lower active power limit controller 325, and perform addition calculation to obtain active power reference signal 320 of the optical storage system.
Voltage V of the present embodiment min Set to 0.9 times of rated voltage value, voltage V max Is set to a rated voltage value of 1.1 times. And the V/P sagging characteristic curve is an asymmetric sagging curve, the active power difference value P max -P o Greater than the active power difference P o -P min 。
As shown in fig. 4, the optical storage DC/AC conversion controller 2 includes a direct current voltage controller 21, a reactive power controller 26, a current controller 23, a phase locked loop 29, and a DC/AC conversion drive signal generator 25.
The input end of the direct current voltage controller 21 is connected in parallel with the two ends of the direct current side capacitor 13, the input end of the reactive power controller 26 is connected with the power distribution network 18, the output ends of the direct current voltage controller 21 and the reactive power controller 26 are connected with the input end of the current controller 23, the output end of the current controller 23 is connected with the input end of the DC/AC conversion driving signal generator 25, the output end of the DC/AC conversion driving signal generator 25 is connected with the control end of the optical storage DC/AC converter 14, the input end of the phase-locked loop 29 is connected with the input end of the reactive power controller 26, and the output end of the phase-locked loop 29 is connected with the input end of the current controller 23.
Wherein the DC voltage controller 21 receives the DC capacitor voltage signal U dc And a DC voltage reference signal U dcref Outputting a d-axis current reference signal 22 by calculation and processing, and outputting the d-axis current reference signal 22 to a current controller 23; the reactive power controller 26 receives a distribution network three-phase voltage u ta 、u tb 、u tc And a current signal i a 、i b 、i c A q-axis current reference signal 27 is obtained by calculation and processing, and the q-axis current reference signal 27 is output to the current controller 23; phase-locked loop 29 receives a three-phase voltage signal u of the distribution network ta 、u tb 、u tc A voltage phase signal 28 is obtained through phase-locked control and is transmitted to the current controller 23; the current controller 23 receives a d-axis current reference signal 22, a q-axis current reference signal 27 and a three-phase current signal i of the power distribution network a 、i b 、i c And a voltage phase signal 28, which is calculated and processed to obtain a modulated signal 24, and which is supplied to the DC/AC conversion driving signal generator 25 from the modulated signal 24; the DC/AC conversion drive signal generator 25 derives the drive signal 20 from the received modulated signal 24 and delivers the drive signal 20 to the DC/AC converter 14.
As shown in fig. 5, the reactive power controller 26 includes a voltage magnitude calculator 261, a v/Q droop controller 263, a reactive power calculator 268, a subtractor 265, a proportional integrator 267; the input end of the voltage amplitude calculator 261 is connected with the power distribution network 18, the output end of the voltage amplitude calculator 261 is connected with the input end of the V/Q droop controller 263, the output end of the V/Q droop controller 263 and the output end of the reactive power calculator 268 are connected with the input end of the subtracter 265, the output end of the subtracter 265 is connected with the input end of the proportional integrator 267, and the output end of the proportional integrator 267 is connected with the input end of the current controller 23.
The voltage amplitude calculator 261 is configured to receive a three-phase voltage signal u of the power distribution network ta 、u tb 、u tc The calculated voltage amplitude signal 262 is sent to the V/Q droop controller 263; a V/Q droop controller 263 for receiving the voltage amplitude signal 262, calculated from the V/Q droop characteristicsThe reactive power reference signal 264 and is fed to the subtractor 265; a reactive power calculator 268 for receiving the three-phase voltage u ta 、u tb 、u tc And a current signal i a 、i b 、i c The calculated reactive power signal 269 is sent to subtractor 265; the subtracter 265 receives the reactive power reference signal 264 and the reactive power signal 269, performs subtraction operation on the reactive power reference signal 264 and the reactive power signal 269 to obtain a reactive power error value 266, and transmits the calculation result to the proportional integrator 267; a proportional integrator 267 for receiving the reactive power error value 266, and calculating and processing the q-axis current reference signal 27.
As shown in fig. 6, the V/Q droop controller 263 includes a reactive power upper limit controller 201, a reactive power upper droop controller 202, a reactive clamp controller 203, a reactive power lower droop controller 204, a reactive power lower limit controller 205, and an adder 2092.
Wherein, the reactive power upper limit controller 201 is used for collecting the distribution network voltage amplitude signal 262 in real time, if the signal 262 is smaller than or equal to V min The reactive power upper limit controller 201 outputs the reactive power reference signal Q max If the signal 262 is greater than V max The reactive power upper limit controller 201 outputs 0; reactive power upper sag controller 202 for real-time acquisition of a distribution network voltage amplitude signal 262, if the signal 262 is greater than V min And is less than or equal to V Q1 The reactive power upper droop controller 202 outputs a reactive power reference signal Q according to the V/Q droop characteristic 1 Otherwise, the output is 0; the reactive clamp controller 203 is configured to collect the power distribution network voltage amplitude signal 262 in real time, if the signal 262 is greater than V Q1 And is less than or equal to V Q2 The reactive clamp controller 203 outputs 0; reactive power sag controller 204 for real-time acquisition of a distribution network voltage amplitude signal 262 if the signal 262 is greater than V Q2 And is less than or equal to V max The reactive power sag controller 204 outputs a reactive power reference signal Q according to the V/Q sag characteristic curve 2 Otherwise, the output is 0; reactive power lower limit controller 205 for collecting power of distribution network in real timeAmplitude signal 262 if signal 262 is greater than V max The reactive power lower limit controller 205 outputs the reactive power reference signal Q min . And the adder 2092 is configured to receive the output signals 206, 207, 208, 209, 2091 of the reactive power upper limit controller 201, the reactive power upper segment droop controller 202, the reactive clamp controller 203, the reactive power lower segment droop controller 204, and the reactive power lower limit controller 205, and perform addition calculation to obtain the reactive power reference signal 264 of the optical storage system.
The reactive power reference signal Q of the present embodiment max For maximum active reference signal, reactive power reference signal Q min Is the minimum reactive reference signal, and Q max Absolute value of (2) is greater than Q min Is the absolute value of (c).
The above examples are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solution of the present invention should fall within the scope of protection defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (9)
1. A power distribution network voltage control system based on a distributed optical storage system is characterized in that: the photovoltaic power generation system comprises a photovoltaic cell panel, a photovoltaic DC/DC converter, a direct-current side capacitor, an energy storage battery pack, an energy storage DC/DC converter, an energy storage DC/DC conversion controller and an optical storage DC/AC converter, wherein the input end of the photovoltaic DC/DC converter is connected with the cell panel, the output end of the photovoltaic DC/DC converter is connected with the input end of the optical storage DC/AC converter through the direct-current side capacitor, the output end of the optical storage DC/AC converter is connected with a power distribution network through a filter, the input end of the energy storage DC/DC converter is connected with the battery pack, and the output end of the optical storage DC/AC converter is connected with the input end of the optical storage DC/AC converter;
the input end of the energy storage DC/DC conversion controller is connected with the output end of the battery pack, the output end of the battery panel and the power distribution network, the output end of the energy storage DC/DC conversion controller is connected with the control end of the energy storage DC/DC converter and is used for detecting voltage and current signals output by the photovoltaic battery panel, voltage and current signals output by the energy storage battery pack and three-phase voltage signals of the power distribution network, and an energy storage driving signal is formed after signal processing so as to regulate the energy storage DC/DC converter;
the input end of the optical storage DC/AC conversion controller is connected with the power distribution network and the direct current side capacitor, the output end of the optical storage DC/AC conversion controller is connected with the control end of the optical storage DC/AC converter and is used for detecting direct current side capacitor voltage signals and three-phase voltage and current signals of the power distribution network, and an optical storage inversion driving signal is formed after calculation and processing so as to regulate the optical storage DC/AC converter;
the energy storage DC/DC conversion controller comprises a power distribution network voltage amplitude calculator, a photovoltaic cell panel output active power calculator, an energy storage battery pack output active power calculator, a V/P sagging controller, a first subtracter, a second subtracter and a proportional integrator;
the input end of the power distribution network voltage amplitude calculator is connected with the power distribution network, the input end of the photovoltaic cell panel output active power calculator is connected with the output end of the battery panel, the input end of the energy storage battery pack output active power calculator is connected with the output end of the battery pack, the output end of the power distribution network voltage amplitude calculator is connected with the input end of the V/P droop controller, the output ends of the V/P droop controller and the photovoltaic cell panel output active power calculator are connected with the input end of the first subtracter, the output ends of the first subtracter and the energy storage battery pack output active power calculator are connected with the input end of the second subtracter, the output end of the second subtracter is connected with the input end of the proportional integrator, and the output end of the proportional integrator is connected with the control end of the energy storage DC/DC converter;
the optical storage DC/AC conversion controller comprises a direct-current voltage controller, a reactive power controller, a current controller, a phase-locked loop and a DC/AC conversion driving signal generator.
2. The distributed optical storage system-based power distribution network voltage control system according to claim 1, wherein:
the power grid voltage amplitude calculator is used for collecting three-phase voltage signals of the power distribution network in real time and calculating to obtain voltage amplitude signals of the power distribution network;
the V/P droop controller is used for receiving the voltage amplitude signal of the power distribution network and obtaining an active power reference signal of the optical storage system through droop calculation and signal processing;
the photovoltaic cell panel output active power calculator is used for collecting photovoltaic cell panel output voltage and current signals in real time and obtaining photovoltaic cell panel output active power signals through calculation;
the energy storage battery pack output active power calculator is used for collecting output voltage and current signals of the energy storage battery pack in real time and obtaining the output active power signals of the energy storage battery pack through calculation;
the first subtracter is used for receiving the active power reference signal of the optical storage system and the active power signal output by the photovoltaic cell panel, and obtaining an active power reference signal of the energy storage battery pack through operation;
the second subtracter is used for receiving the active power reference signal of the energy storage battery pack and the active power signal output by the energy storage battery pack, and obtaining an active power error signal of the energy storage battery pack through operation;
the proportional integrator is used for receiving the active power error signal of the energy storage battery pack and obtaining a DC/DC converter driving signal through operation.
3. The distributed optical storage system-based power distribution network voltage control system according to claim 1, wherein: the V/P droop controller comprises an active power upper limit controller, an active power upper section droop controller, an active clamp controller, an active power lower section droop controller, an active power lower limit controller and a first adder; the input ends of the active power upper limit controller, the active power upper section droop controller, the active clamp controller, the active power lower section droop controller and the active power lower limit controller are connected with the output end of the power distribution network voltage amplitude calculator, the output ends of the active power upper limit controller, the active power upper section droop controller, the active clamp controller and the active power lower section droop controller are connected with the input end of a first adder, and the output end of the first adder is connected with the input end of a first subtracter;
the active power upper limit controller is used for collecting a voltage amplitude signal of the power distribution network if the signal is smallAt or equal to V min Then output the active power reference signal P max If the signal is greater than V max The output is 0;
the active power upper section sagging controller is used for collecting a voltage amplitude signal of the power distribution network, and if the signal is larger than V min And is less than or equal to V 1 Outputting an active power reference signal P according to the V/P droop characteristic 1 Otherwise, the output is 0;
the active clamp controller is used for collecting voltage amplitude signals of the power distribution network in real time, and if the voltage amplitude signals are larger than V 1 And is less than or equal to V 2 Then a constant active power reference signal P is output o Otherwise, the output is 0;
the active power lower section droop controller is used for collecting a voltage amplitude signal of the power distribution network, if the signal is greater than V 2 And is less than or equal to V max Outputting an active power reference signal P according to the V/P droop characteristic 2 Otherwise, the output is 0;
the active power lower limit controller is used for collecting a voltage amplitude signal of the power distribution network, and if the signal is greater than V max Then output the active power reference signal P min Otherwise, the output is 0;
the first adder is configured to receive output signals of the active power upper limit controller, the active power upper segment droop controller, the active clamp controller, the active power lower segment droop controller, and the active power lower limit controller, and perform addition calculation to obtain an active power reference signal of the optical storage system.
4. A distributed optical storage system-based power distribution network voltage control system as claimed in claim 3, wherein: the active power reference signal P max As the maximum active reference signal, the active power reference signal P min Is the minimum active reference signal; said voltage V min Set to 0.9 times of rated voltage value, voltage V max Setting the rated voltage value to be 1.1 times; the V/P sagging characteristic curve is an asymmetric sagging curve, and the active power difference value P max -P o Greater than the active power difference P o -P min 。
5. The distributed optical storage system-based power distribution network voltage control system according to claim 1, wherein:
the input end of the direct current voltage controller is connected in parallel with the two ends of the direct current side capacitor, the input end of the reactive power controller is connected with the power distribution network, the output ends of the direct current voltage controller and the reactive power controller are connected with the input end of the current controller, the output end of the current controller is connected with the input end of the DC/AC conversion driving signal generator, the output end of the DC/AC conversion driving signal generator is connected with the control end of the light storage DC/AC converter, the input end of the phase-locked loop is connected with the input end of the reactive power controller, and the output end of the phase-locked loop is connected with the input end of the current controller.
6. The distributed optical storage system-based power distribution network voltage control system according to claim 5, wherein:
the direct-current voltage controller is used for receiving a direct-current capacitor voltage signal and a direct-current voltage reference signal and outputting a d-axis current reference signal through calculation;
the reactive power controller is used for receiving three-phase voltage and current signals of the power distribution network and obtaining a q-axis current reference signal through calculation;
the phase-locked loop is used for receiving three-phase voltage signals of the power distribution network and calculating to obtain voltage phase signals;
the current controller is used for receiving a d-axis current reference signal, a q-axis current reference signal, a three-phase current signal and a voltage phase signal of the power distribution network, and obtaining a modulation signal through calculation;
the DC/AC conversion driving signal generator is used for obtaining a driving signal according to the received modulation signal and transmitting the driving signal to the optical storage DC/AC converter.
7. The distributed optical storage system-based power distribution network voltage control system according to claim 5, wherein: the reactive power controller comprises a voltage amplitude calculator, a V/Q droop controller, a reactive power calculator, a third subtracter and a proportional integrator;
the voltage amplitude calculator is used for receiving three-phase voltage signals of the power distribution network and obtaining voltage amplitude signals through calculation;
the V/Q droop controller is used for receiving the voltage amplitude signal and calculating a reactive power reference signal through a V/Q droop characteristic curve;
the reactive power calculator is used for receiving three-phase voltage and current signals of the power distribution network and obtaining reactive power signals through calculation;
the third subtracter is used for receiving the reactive power reference signal and the reactive power signal, and subtracting the reactive power reference signal and the reactive power signal to obtain a reactive power error value;
the proportional integrator is used for receiving the reactive power error value and obtaining a q-axis current reference signal through calculation and processing.
8. The distributed optical storage system-based power distribution network voltage control system as claimed in claim 7, wherein: the V/Q droop controller comprises a reactive power upper limit controller, a reactive power upper section droop controller, a reactive clamp controller, a reactive power lower section droop controller, a reactive power lower limit controller and a second adder, wherein the input ends of the reactive power upper limit controller, the reactive power upper section droop controller, the reactive clamp controller, the reactive power lower section droop controller and the reactive power lower limit controller are all connected with the output end of the voltage amplitude calculator, the output end of the reactive power upper section droop controller, the reactive clamp controller, the reactive power lower section droop controller and the output end of the reactive power lower limit controller are all connected with the input end of the second adder, and the output end of the second adder is connected with the input end of the third subtractor.
9. The method for controlling a voltage control system of a power distribution network based on a distributed optical storage system according to claim 1, comprising the steps of:
(1) Converting the direct-current voltage output by the battery plate into high direct-current voltage through a photovoltaic DC/DC converter, and storing the converted electric energy through a direct-current side capacitor;
(2) The energy storage DC/DC converter is used for absorbing the electric energy of the capacitor at the direct current side, the light storage DC/AC converter is used for converting the direct current voltage output by the photovoltaic DC/DC converter into alternating current voltage, and the alternating current voltage is input to the power distribution network after filtering;
(3) Output voltage U of photovoltaic cell panel is acquired in real time through energy storage DC/DC conversion controller cell And current signal I cell Output voltage U of energy storage battery pack pv And current signal I pv Three-phase voltage signal u of power distribution network 18 ta 、u tb 、u tc Forming an energy storage driving signal after signal processing, and executing control on the energy storage DC/DC converter;
(4) The DC side capacitance voltage signal U is acquired in real time through the optical storage DC/AC conversion controller dc Three-phase voltage u of distribution network 18 ta 、u tb 、u tc And a current signal i a 、i b 、i c And performing a control process of the optical storage DC/AC converter by calculating and processing to form an optical storage inversion driving signal.
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