CN113258586A - Power distribution static synchronous compensator power distribution network active and reactive compensation method based on energy storage - Google Patents

Power distribution static synchronous compensator power distribution network active and reactive compensation method based on energy storage Download PDF

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CN113258586A
CN113258586A CN202011397949.1A CN202011397949A CN113258586A CN 113258586 A CN113258586 A CN 113258586A CN 202011397949 A CN202011397949 A CN 202011397949A CN 113258586 A CN113258586 A CN 113258586A
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statcom
current
power distribution
compensation
voltage
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CN113258586B (en
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张自伟
伏祥运
程振华
岳付昌
陆兵
王建新
朱立位
黄淮
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State Grid Jiangsu Electric Power Co Ltd
Lianyungang Power Supply Co of State Grid Jiangsu Electric Power Co Ltd
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State Grid Jiangsu Electric Power Co Ltd
Lianyungang Power Supply Co of State Grid Jiangsu Electric Power Co Ltd
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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
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
    • H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
    • H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
    • 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
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • 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
    • Y02E40/10—Flexible AC transmission systems [FACTS]

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Abstract

The invention discloses an energy storage-based active and reactive power compensation method for a power distribution network of a static synchronous compensator for power distribution, which is used for performing reactive power and real power compensation on the power distribution network by using a D-STATCOM (static synchronous compensator) containing energy storage based on an instantaneous symmetric component theory. Firstly, establishing a static synchronous compensator model containing energy storage, and describing the limitation of the traditional compensation device and the effectiveness of the static synchronous compensator device containing energy storage on improving the power quality of a distribution network; secondly, extracting fundamental wave positive sequence components of three-phase voltage and current by utilizing an instantaneous symmetrical component theory; finally, the static synchronous compensator with the stored energy is controlled according to the proposed control strategy, and reactive power compensation and active power compensation are provided. The invention realizes the compensation of the reactive power and the active power of the power distribution network, improves the electric energy quality of the power distribution network, reduces the frequency of the faults of the power distribution system and improves the stability and the robustness of the power distribution system.

Description

Power distribution static synchronous compensator power distribution network active and reactive compensation method based on energy storage
Technical Field
The invention relates to the field of power electronics, in particular to an active and reactive power compensation method for a power distribution network of a static synchronous power distribution compensator based on energy storage.
Background
A large number of inductive loads connected in the power distribution network bring great reactive power loss to the whole power distribution network. Reactive power loss has many adverse effects on the distribution network. Therefore, the distribution network needs to provide reactive compensation to mitigate or reduce these adverse effects. The resistance in the distribution network is relatively large and active compensation should be provided in order to reduce the voltage drop caused by the resistance of the distribution line. Therefore, the power distribution network should perform active compensation and reactive compensation simultaneously. The traditional compensation device and the traditional solution have many defects and cannot meet the problem of simultaneous active and reactive compensation under variable load conditions. The traditional reactive power compensation device can not provide real active power compensation in a power distribution network, and voltage drop is avoided.
Capacitors are typically used for reactive compensation, but their response is very slow, providing only fixed compensation. Therefore, the capacitor cannot be used for distribution line compensation in case of load changes. In addition, capacitors or other conventional compensation devices also do not provide any active compensation in the distribution line. For these reasons, conventional compensation devices are not suitable for providing reactive and active power compensation in dynamic load change situations.
Disclosure of Invention
The invention aims to: the distribution static synchronous compensator D-STATCOM based on the instantaneous symmetric component theory is used for carrying out reactive power compensation and active power compensation on the distribution network.
The solution of the invention is: an active and reactive compensation method for a power distribution network of a static synchronous power distribution compensator based on energy storage comprises the following steps:
step 1: constructing a static synchronous compensator D-STATCOM containing energy storage to obtain a nonlinear dynamic model of the STATCOM/BESS;
step 2: extracting fundamental wave positive sequence components of three-phase voltage and current by utilizing an instantaneous symmetrical component theory according to the static synchronous compensator model containing the stored energy constructed in the step 1;
and step 3: and calculating a reference current value according to required compensation based on a control strategy of an instantaneous symmetrical component theory, and generating gate pulse signals of all switching devices of a VSC unit of the converter in the D-STATCOM.
The invention has the advantages that: 1) the D-STATCOM is a static compensation device based on power electronic technology, and can provide reactive compensation, 2) the D-STATCOM equipment can not only provide reactive power compensation on the distribution line, but also provide active power support, and avoid voltage drop of the distribution system; 3) the invention realizes the compensation of the reactive power and the active power of the power distribution network, improves the electric energy quality of the power distribution network, reduces the frequency of the faults of the power distribution system and improves the stability and the robustness of the power distribution system.
The present invention will be described in further detail with reference to the accompanying drawings.
Drawings
Fig. 1 is a topological structure diagram of a static synchronous compensator for power distribution with energy storage according to the invention.
Fig. 2 is a simulation main circuit diagram of the static synchronous compensator for power distribution with energy storage according to the invention.
Fig. 3 is a simulation sub-circuit diagram of the static synchronous compensator for power distribution with stored energy according to the invention.
Fig. 4 is a graph showing the result of active and reactive compensation provided by the static synchronous compensator with stored energy for power distribution of the invention.
Fig. 5 shows the voltage variation of the grid-connected point of the static synchronous compensator for power distribution with stored energy according to the present invention.
Detailed Description
An active and reactive compensation method for a power distribution network of a static synchronous power distribution compensator based on energy storage comprises the following steps:
step 1: constructing a static synchronous compensator D-STATCOM containing energy storage to obtain a nonlinear dynamic model of the STATCOM/BESS, describing the dynamic process of the STATCOM/BESS and the voltage and current relation with a system interface, and specifically comprising the following steps:
the three-phase dynamic differential equation of the alternating current side of the STATCOM/BESS and the system interface is as follows:
Figure BDA0002815952060000021
wherein L and R are respectively inductance and resistance of the transformer, ua、ub、ucThree-phase voltage to earth for STATCOM/BESS access points, ea、eb、ecThree-phase voltage to ground, i, for inverter outputea、ieb、iecThree-phase current output by the inverter;
using the access point voltage as a reference point, u can be determineda、ub、ucAnd ea、eb、ecWrite as:
Figure BDA0002815952060000022
Figure BDA0002815952060000031
where ω is the angular frequency, meAnd deltaeRespectively the amplitude modulation ratio and the phase angle of the voltage source inverter; u shapemIs the voltage amplitude, U, of the access point busdcIs the capacitor voltage;
capacitor voltage UdcThe dynamic process of (2) is:
Figure BDA0002815952060000032
performing Park conversion on the formula, and neglecting the resistance and transient process of the transformer to obtain a nonlinear dynamic model of the STATCOM/BESS
Figure BDA0002815952060000033
Figure BDA0002815952060000034
In the formula C and UdcRespectively, DC capacitance and capacitance voltage, meAnd deltaeAmplitude modulation ratio and phase angle, i, of the voltage source inverter, respectivelyedAnd ieqAre respectively current ieProjection on d-and q-axes, UtdAnd UtqFor the projection of the access point voltage U on the d-axis and q-axis, xeIs the reactance of the transformer.
Step 2: according to the static synchronous compensator model containing the stored energy constructed in the step 1, the fundamental wave positive sequence component of the three-phase voltage and the current is extracted by utilizing the instantaneous symmetrical component theory, and the method specifically comprises the following steps:
using the transient symmetric component theory, the positive sequence components of the voltage and current are represented as:
Figure BDA0002815952060000035
Figure BDA0002815952060000036
in the formula: u. ofa、ub、ucA-phase, b-phase and c-phase voltages respectively representing three-phase voltage-to-ground of STATCOM/BESS access point；iea、ieb、iecThe phase a, phase b and phase c currents output by the inverter are respectively, and a is a constant.
And step 3: based on the control strategy of the instantaneous symmetrical component theory, calculating a reference current value according to required compensation, and generating gate pulse signals of all switching devices of a VSC unit of a converter in the D-STATCOM, specifically:
the basic goal of the control strategy is to balance the supply current as shown in the following equation:
iea+ieb+iec＝0
at this time, the load reactive demand is provided by the D-STATCOM, and then:
uaiea+ubieb+uciec＝PL
wherein, PLActive power required for the load ua、ub、ucThree-phase voltage-to-ground for STATCOM/BESS access points, iea、ieb、iecThree-phase current output by the inverter;
in addition to the active power required by the load, the D-STATCOM with stored energy should also provide additional active power to meet the loss P of the switching device of the VSClossObtaining:
uaiea+ubieb+uciec＝PL+Ploss
Figure BDA0002815952060000041
Figure BDA0002815952060000042
Figure BDA0002815952060000043
in order to provide fully reactive compensation, the D-STATCOM needs to provide the required compensation current to the distribution line, and the equation of the reference compensation current provided by the D-STATCOM on the distribution line is as follows:
Figure BDA0002815952060000044
Figure BDA0002815952060000045
Figure BDA0002815952060000046
wherein ila、ilb、ilcRespectively, three phase load currents; i.e. icar、icbr、iccrRespectively three-phase reference compensation current;
compensating the three phases with reference current icar、icbr、iccrRespectively with the actual current iea、ieb、iecAnd comparing the difference values, sending the difference value signals into a PWM pulse generator, generating control signals in the pulse generator, sending the control signals into a VSC unit in a D-STATCOM, and controlling the on-off of 6 VSC converter switching devices to realize active and reactive compensation of the system.
A distribution network active and reactive compensation method system of a static synchronous compensator based on energy storage comprises the following modules:
constructing a nonlinear dynamic model module: the method is used for constructing the static synchronous compensator D-STATCOM containing the energy storage to obtain a nonlinear dynamic model of the STATCOM/BESS;
the voltage and current fundamental wave positive sequence component extraction module: extracting fundamental wave positive sequence components of three-phase voltage and current by utilizing an instantaneous symmetric component theory according to a nonlinear dynamic model of the STATCOM/BESS;
the current compensation module: and calculating a reference current value according to required compensation based on a control strategy of an instantaneous symmetrical component theory, and generating gate pulse signals of all switching devices of a VSC unit of the converter in the D-STATCOM.
A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the following steps when executing the computer program:
step 1: constructing a static synchronous compensator D-STATCOM containing energy storage to obtain a nonlinear dynamic model of the STATCOM/BESS, describing the dynamic process of the STATCOM/BESS and the voltage and current relation with a system interface, and specifically comprising the following steps:
Figure BDA0002815952060000051
Figure BDA0002815952060000052
in the formula C and UdcRespectively, DC capacitance and capacitance voltage, meAnd deltaeAmplitude modulation ratio and phase angle, i, of the voltage source inverter, respectivelyedAnd ieqAre respectively current ieProjection on d-and q-axes, UtdAnd UtqFor the projection of the access point voltage U on the d-axis and q-axis, xeIs the reactance of the transformer.
Step 2: according to the static synchronous compensator model containing the stored energy constructed in the step 1, the fundamental wave positive sequence component of the three-phase voltage and the current is extracted by utilizing the instantaneous symmetrical component theory, and the method specifically comprises the following steps:
using the transient symmetric component theory, the positive sequence components of the voltage and current are represented as:
Figure BDA0002815952060000053
Figure BDA0002815952060000061
in the formula: u. ofa、ub、ucThe a-phase voltage, the b-phase voltage and the c-phase voltage respectively represent three-phase voltage to earth of the STATCOM/BESS access point; i.e. iea、ieb、iecThe phase a, phase b and phase c currents output by the inverter are respectively, and a is a constant.
And step 3: based on the control strategy of the instantaneous symmetrical component theory, calculating a reference current value according to required compensation, and generating gate pulse signals of all switching devices of a VSC unit of a converter in the D-STATCOM, specifically:
the basic goal of the control strategy is to balance the supply current as shown in the following equation:
iea+ieb+iec＝0
at this time, the load reactive demand is provided by the D-STATCOM, and then:
uaiea+ubieb+uciec＝PL
wherein, PLActive power required for the load ua、ub、ucThree-phase voltage-to-ground for STATCOM/BESS access points, iea、ieb、iecThree-phase current output by the inverter;
in addition to the reactive power of the load, the D-STATCOM with stored energy should provide additional active power to meet the loss P of the switching devices of the VSClossObtaining:
uaiea+ubieb+uciec＝PL+Ploss
the equation for the reference compensation current provided by the available D-STATCOM for the wiring is as follows:
Figure BDA0002815952060000062
Figure BDA0002815952060000063
Figure BDA0002815952060000064
wherein ila、ilb、ilcRespectively, three phase load currents; i.e. icar、icbr、iccrRespectively three-phase reference compensation current;
compensating the three phases with reference current icar、icbr、iccrRespectively with the actual current iea、ieb、iecAnd comparing the difference values, sending the difference value signals into a PWM pulse generator, generating control signals in the pulse generator, sending the control signals into a VSC unit in a D-STATCOM, and controlling the on-off of 6 VSC converter switching devices to realize active and reactive compensation of the system.
A computer-storable medium having stored thereon a computer program which, when executed by a processor, performs the steps of:
step 1: constructing a static synchronous compensator D-STATCOM containing energy storage to obtain a nonlinear dynamic model of the STATCOM/BESS, describing the dynamic process of the STATCOM/BESS and the voltage and current relation with a system interface, and specifically comprising the following steps:
Figure BDA0002815952060000071
Figure BDA0002815952060000072
in the formula C and UdcRespectively, DC capacitance and capacitance voltage, meAnd deltaeAmplitude modulation ratio and phase angle, i, of the voltage source inverter, respectivelyedAnd ieqAre respectively current ieProjection on d-and q-axes, UtdAnd UtqFor the projection of the access point voltage U on the d-axis and q-axis, xeIs the reactance of the transformer.
Step 2: according to the static synchronous compensator model containing the stored energy constructed in the step 1, the fundamental wave positive sequence component of the three-phase voltage and the current is extracted by utilizing the instantaneous symmetrical component theory, and the method specifically comprises the following steps:
using the transient symmetric component theory, the positive sequence components of the voltage and current are represented as:
Figure BDA0002815952060000073
Figure BDA0002815952060000074
in the formula: u. ofa、ub、ucThe a-phase voltage, the b-phase voltage and the c-phase voltage respectively represent three-phase voltage to earth of the STATCOM/BESS access point; i.e. iea、ieb、iecThe phase a, phase b and phase c currents output by the inverter are respectively, and a is a constant.
And step 3: according to the fundamental wave positive sequence component of the three-phase voltage and the current extracted in the step 2, a control strategy based on an instantaneous symmetric component theory is provided, a reference current value is calculated according to required compensation, and grid pulse signals of all switching devices of a VSC unit of the converter in the D-STATCOM are generated, and the method specifically comprises the following steps:
the basic goal of the control strategy is to balance the supply current as shown in the following equation:
iea+ieb+iec＝0
at this time, the load reactive demand is provided by the D-STATCOM, and then:
uaiea+ubieb+uciec＝PL
wherein, PLActive power required for the load ua、ub、ucThree-phase voltage-to-ground for STATCOM/BESS access points, iea、ieb、iecThree-phase current output by the inverter;
in addition to the reactive power of the load, the D-STATCOM with stored energy should provide additional active power to meet the loss P of the switching devices of the VSClossObtaining:
uaiea+ubieb+uciec＝PL+Ploss
the equation for the reference compensation current provided by the available D-STATCOM for the wiring is as follows:
Figure BDA0002815952060000081
Figure BDA0002815952060000082
Figure BDA0002815952060000083
wherein ila、ilb、ilcRespectively, three phase load currents; i.e. icar、icbr、iccrRespectively three-phase reference compensation current;
compensating the three phases with reference current icar、icbr、iccrRespectively with the actual current iea、ieb、iecAnd comparing the difference values, sending the difference value signals into a PWM pulse generator, generating control signals in the pulse generator, sending the control signals into a VSC unit in a D-STATCOM, and controlling the on-off of 6 VSC converter switching devices to realize active and reactive compensation of the system.
The invention is described in detail below with reference to the accompanying drawings and examples.
Examples
An active and reactive compensation method for a power distribution network of a static synchronous power distribution compensator based on energy storage comprises the following steps:
step 1: constructing a static synchronous compensator D-STATCOM containing energy storage, as shown in FIG. 1, obtaining a nonlinear dynamic model of the STATCOM/BESS, describing the dynamic process of the STATCOM/BESS and the voltage and current relationship with a system interface, specifically:
the three-phase dynamic differential equation of the alternating current side of the STATCOM/BESS and the system interface is as follows:
Figure BDA0002815952060000091
wherein L and R are respectively inductance and resistance of the transformer, ua、ub、ucThree-phase voltage to earth for STATCOM/BESS access points, ea、eb、ecThree-phase voltage to ground, i, for inverter outputea、ieb、iecThree-phase current output by the inverter;
using the access point voltage as a reference point, u can be determineda、ub、ucAnd ea、eb、ecWrite as:
Figure BDA0002815952060000092
Figure BDA0002815952060000093
where ω is the angular frequency, meAnd deltaeRespectively the amplitude modulation ratio and the phase angle of the voltage source inverter; u shapemThe voltage amplitude of the access point bus;
the dynamic process of the capacitor voltage is as follows:
Figure BDA0002815952060000094
performing Park conversion on the formula, and neglecting the resistance and transient process of the transformer to obtain a nonlinear dynamic model of the STATCOM/BESS
Figure BDA0002815952060000095
Figure BDA0002815952060000096
In the formula C and UdcRespectively, DC capacitance and capacitance voltage, meAnd deltaeAmplitude modulation ratio and phase angle, i, of the voltage source inverter, respectivelyedAnd ieqAre respectively current ieProjection on d-and q-axes, UtdAnd UtqFor the projection of the access point voltage U on the d-axis and q-axis, xeIs the reactance of the transformer.
Step 2: according to the static synchronous compensator model containing the stored energy constructed in the step 1, the fundamental wave positive sequence component of the three-phase voltage and the current is extracted by utilizing the instantaneous symmetrical component theory, and the method specifically comprises the following steps:
using the transient symmetric component theory, the positive sequence components of the voltage and current are represented as:
Figure BDA0002815952060000101
Figure BDA0002815952060000102
in the formula: u. ofa、ub、ucThe a-phase voltage, the b-phase voltage and the c-phase voltage respectively represent three-phase voltage to earth of the STATCOM/BESS access point; i.e. iea、ieb、iecThe phase a, phase b and phase c currents output by the inverter are respectively, and a is a constant.
And step 3: based on the control strategy of the instantaneous symmetrical component theory, calculating a reference current value according to required compensation, and generating gate pulse signals of all switching devices of a VSC unit of a converter in the D-STATCOM, specifically:
the basic goal of the control strategy is to balance the supply current as shown in the following equation:
iea+ieb+iec＝0
at this time, the load reactive demand is provided by the D-STATCOM, and then:
uaiea+ubieb+uciec＝PL
wherein, PLActive power required for the load ua、ub、ucThree-phase voltage-to-ground for STATCOM/BESS access points, iea、ieb、iecThree-phase current output by the inverter;
in addition to the reactive power of the load, the D-STATCOM with stored energy should provide additional active power to meet the loss P of the switching devices of the VSClossObtaining:
uaiea+ubieb+uciec＝PL+Ploss
Figure BDA0002815952060000103
Figure BDA0002815952060000104
Figure BDA0002815952060000111
in order to provide fully reactive compensation, the D-STATCOM needs to provide the required compensation current to the distribution line, and the equation of the reference compensation current provided by the D-STATCOM on the distribution line is as follows:
Figure BDA0002815952060000112
Figure BDA0002815952060000113
Figure BDA0002815952060000114
wherein ila、ilb、ilcRespectively, three phase load currents; i.e. icar、icbr、iccrRespectively three-phase reference compensation current;
compensating the three phases with reference current icar、icbr、iccrRespectively with the actual current iea、ieb、iecAnd comparing the difference values, sending the difference value signals into a PWM pulse generator, generating control signals in the pulse generator, sending the control signals into a VSC unit in a D-STATCOM, and controlling the on-off of 6 VSC converter switching devices to realize active and reactive compensation of the system.
The performance of the D-STATCOM control strategy containing the energy storage, which provides reactive power compensation and active power compensation for different R-L type load combinations, is verified through simulation by MATLAB/SIMULINK software. The D-STATCOM main simulation circuit and sub-circuit with energy storage written in MATLAB/SIMULINK software for simulation are shown in FIG. 2 and FIG. 3 respectively. The following table lists the parameter values of the energy-storing D-STATCOM used in the simulation.
Figure BDA0002815952060000115
(1) Reactive compensation
The D-STATCOM/BESS provides reactive demand for all loads to provide full reactive compensation. In this case, the power supply only provides the active power demand of the load, while the reactive demand of the load is almost entirely provided by the D-STATCOM. The full reactive compensation simulation result provided by the D-STATCOM is shown as the following mark
(2) Active power compensation
The D-STATCOM/BESS provides partial active power compensation of the distribution line in addition to full reactive power compensation. The simulation results for this mode of operation are shown in the following table:
Figure BDA0002815952060000121
the results of the reactive and active power compensation provided by the D-STATCOM are shown in fig. 4.
(3) Stabilization of voltage
The D-STATCOM with energy storage dynamically exchanges reactive power with the system in a two-way manner in real time, optimizes reactive power flow of the system, maintains voltage stability of a grid-connected point of the system, and the voltage change condition of the grid-connected point during frequency support is shown in fig. 5. The lowest point of the voltage drop is 0.8p.u., and the lowest point is recovered to a rated value after the voltage drop is temporarily dropped, so that the capacity of the system for coping with new energy power and load fluctuation is enhanced, and the full consumption of clean energy power and the reliable realization of effective frequency support are ensured.
By last knowing, contain energy memory's distribution static synchronous compensator equipment, not only can provide reactive power compensation on the distribution lines, can provide active power moreover and support, avoid distribution system's voltage to descend to can realize the compensation to distribution network reactive and active power, improve the electric energy quality of distribution network, reduce the number of times that distribution system broke down, improve distribution system's stability and robustness.

Claims (7)

1. A distribution network active and reactive compensation method of a distribution static synchronous compensator based on energy storage is characterized by comprising the following steps:
step 1: constructing a static synchronous compensator D-STATCOM containing energy storage to obtain a nonlinear dynamic model of the STATCOM/BESS;
step 2: extracting fundamental wave positive sequence components of three-phase voltage and current by utilizing an instantaneous symmetrical component theory according to the static synchronous compensator model containing the stored energy constructed in the step 1;
and step 3: and calculating a reference current value according to the required compensation based on a control strategy of an instantaneous symmetrical component theory, and generating gate pulse signals of all switching devices of a VSC unit of a converter in the D-STATCOM to finish active and reactive compensation.
2. The active and reactive compensation method for the power distribution network of the energy storage based power distribution static synchronous compensator according to claim 1, wherein the nonlinear dynamic model of the STATCOM/BESS in the step 1 describes a dynamic process of the STATCOM/BESS and a voltage and current relationship with a system interface, and specifically comprises:
Figure FDA0002815952050000011
Figure FDA0002815952050000012
in the formula C and UdcRespectively, DC capacitance and capacitance voltage, meAnd deltaeAmplitude modulation ratio and phase angle, i, of the voltage source inverter, respectivelyedAnd ieqAre respectively current ieProjection on d-and q-axes, UtdAnd UtqFor the projection of the access point voltage U on the d-axis and q-axis, xeIs the reactance of the transformer.
3. The active and reactive compensation method for the power distribution network of the energy storage based power distribution static synchronous compensator according to claim 1, wherein the extracting of the fundamental positive sequence component of the three-phase voltage and current in the step 2 is specifically as follows:
based on the transient symmetric component theory, the positive sequence components of the voltage and current are respectively expressed as:
Figure FDA0002815952050000013
Figure FDA0002815952050000014
in the formula: u. ofa、ub、ucRespectively representing a phase voltage a, a phase voltage b and a phase voltage c of the three phases of the STATCOM/BESS access point relative to the ground voltage; i.e. iea、ieb、iecRespectively an a phase, a b phase and a,The c-phase current, a, is constant.
4. The active and reactive compensation method for the power distribution network of the energy storage based power distribution static synchronous compensator according to claim 1, wherein the control strategy in the step 3 is specifically as follows:
the basic goal of the control strategy is to balance the supply current as shown in the following equation:
iea+ieb+iec＝0
the D-STATCOM with stored energy provides the load reactive demand and the additional active power, then:
uaiea+ubieb+uciec＝PL+Ploss
wherein, PLActive power required for the load, PlossLosses of switching devices, u, for VSCa、ub、ucThree-phase voltage-to-ground for STATCOM/BESS access points, iea、ieb、iecThree-phase current output by the inverter;
Figure FDA0002815952050000021
Figure FDA0002815952050000022
Figure FDA0002815952050000023
the equation for the reference compensation current provided by the D-STATCOM for the wiring is as follows:
Figure FDA0002815952050000024
Figure FDA0002815952050000025
Figure FDA0002815952050000026
wherein ila、ilb、ilcRespectively, three phase load currents; i.e. icar、icbr、iccrRespectively three-phase reference compensation current;
compensating the three phases with reference current icar、icbr、iccrRespectively with the actual current iea、ieb、iecAnd comparing the difference values, sending the difference value signals into a PWM pulse generator, generating control signals in the pulse generator, sending the control signals into a VSC unit in a D-STATCOM, and controlling the on-off of 6 VSC converter switching devices to realize active and reactive compensation of the system.
5. A distribution network active and reactive compensation method system of a static synchronous compensator based on energy storage is characterized by comprising the following modules:
constructing a nonlinear dynamic model module: the method is used for constructing the static synchronous compensator D-STATCOM containing the energy storage to obtain a nonlinear dynamic model of the STATCOM/BESS;
the voltage and current fundamental wave positive sequence component extraction module: extracting fundamental wave positive sequence components of three-phase voltage and current by utilizing an instantaneous symmetric component theory according to a nonlinear dynamic model of the STATCOM/BESS;
the current compensation module: and calculating a reference current value according to required compensation based on a control strategy of an instantaneous symmetrical component theory, and generating gate pulse signals of all switching devices of a VSC unit of the converter in the D-STATCOM.
6. A computer arrangement comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the steps of the method as claimed in any one of claims 1 to 4 are implemented by the processor when executing the computer program.
7. A computer-storable medium having a computer program stored thereon, wherein the computer program is adapted to carry out the steps of the method according to any one of claims 1-4 when executed by a processor.
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CN101232187A (en) * 2008-01-30 2008-07-30 湖南大学 Positive and negative order double ring stacking control method of electric power distribution static state synchronous compensator based on instantaneous power balance
CN103618316A (en) * 2013-03-01 2014-03-05 华北电力大学（保定） High compensation precision method for controlling static synchronization compensator for power distribution network in electric system
CN106549400A (en) * 2016-12-10 2017-03-29 三峡大学 A kind of control method of the distribution static synchronous compensator based on voltage prediction
US10003195B1 (en) * 2017-02-06 2018-06-19 University Of Macau Hybrid STATCOM with wide compensation range and low DC-link voltage
CN108306294A (en) * 2018-02-27 2018-07-20 浙江群力电气有限公司 A kind of alleviation method of current harmonics

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101232187A (en) * 2008-01-30 2008-07-30 湖南大学 Positive and negative order double ring stacking control method of electric power distribution static state synchronous compensator based on instantaneous power balance
CN103618316A (en) * 2013-03-01 2014-03-05 华北电力大学（保定） High compensation precision method for controlling static synchronization compensator for power distribution network in electric system
CN106549400A (en) * 2016-12-10 2017-03-29 三峡大学 A kind of control method of the distribution static synchronous compensator based on voltage prediction
US10003195B1 (en) * 2017-02-06 2018-06-19 University Of Macau Hybrid STATCOM with wide compensation range and low DC-link voltage
CN108306294A (en) * 2018-02-27 2018-07-20 浙江群力电气有限公司 A kind of alleviation method of current harmonics

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