CN113541173B - Battery energy storage system cluster control device and control method under weak power grid condition - Google Patents
Battery energy storage system cluster control device and control method under weak power grid condition Download PDFInfo
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Abstract
The invention relates to the technical field of large-scale battery energy storage systems and smart grid application, and discloses a battery energy storage system cluster control device and a control method under weak grid conditions, wherein the control device comprises the following steps: the system comprises a multifunctional power meter module, a factory level control algorithm module, a converter PCS power distribution module, a PCS virtual synchronous control algorithm module and a Profinet communication module. The cluster control device and the cluster control method for the battery energy storage system under the condition of the weak power grid realize the power distribution function between the energy storage converters PCS based on the setting and control algorithm of the working mode, solve the problems of stable and reliable operation of a large-scale energy storage system under the condition of the weak power grid with low short-circuit capacity, realize that the energy storage system has the power control characteristic similar to that of a traditional synchronous generator power plant at a high-voltage bus connection point (PoC), realize the seamless switching between grid-connected operation and island operation, provide the virtual inertia stable frequency change rate for the power grid, and realize the active rapid supporting function of the transient frequency voltage of the photovoltaic/wind power plant.
Description
Technical Field
The invention relates to the technical field of large-scale battery energy storage systems and smart grid application, in particular to a battery energy storage system cluster control device and a control method under the condition of a weak grid.
Background
Photovoltaic and wind power generation are grid-connected by adopting a power electronic inverter technology, and the power output of the photovoltaic and wind power generation has the characteristic of intermittent fluctuation, so that a certain regional power grid or microgrid becomes a weak power grid system due to the access of high-proportion new energy.
The large-scale battery energy storage system formed based on the battery and power electronic grid-connected inverter (energy storage converter) technology is one of important technical means for promoting the spanning development of new energy, improving the new energy consumption capability and constructing a novel power system taking new energy as a main body by virtue of the technical advantages of flexible installation and arrangement, quick power response time, high control precision and the like.
The conventional battery energy storage system generally adopts an energy storage converter (PCS) to follow the control technology of the voltage and the phase of a power grid and is connected to the power grid in a current source power generation system working mode, the power grid in the conventional battery energy storage system needs to have enough capacity and system strength to ensure that the energy storage converter PCS can operate reliably and stably, and the farther the energy storage system is arranged away from a power plant of a conventional synchronous generator set, the higher the permeability is, the more likely the electric energy output voltage waveform is influenced by network interference and the working mode of the PCS.
Under the condition of a weak power grid, the frequency and voltage stability control technology of a power system is greatly different from that of the traditional large power grid, the control device and the control method of the conventional battery energy storage system are difficult to ensure that an energy storage converter works stably under the condition of interference and fault of the power grid, and the function and the characteristic that the energy storage battery system provides inhibition and regulation for the frequency change rate of the power grid by means of mechanical rotation inertia of the energy storage battery system like the traditional synchronous generator system are not realized.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a battery energy storage system cluster control device and a control method under the condition of a weak power grid, which have the advantages of providing virtual inertia stable frequency change rate for the power grid, realizing the active rapid supporting function of transient frequency voltage of a photovoltaic/wind power plant station, seamlessly switching between grid-connected operation and isolated island operation, and solving the problem of stable and reliable operation of a large-scale energy storage system under the condition of the weak power grid with low short-circuit capacity.
The invention provides the following technical scheme: the utility model provides a battery energy storage system cluster controlling means under weak electric wire netting condition which characterized in that includes:
the multifunctional power meter module is used for outputting UAct, Fact, Pact and QACT signals;
the factory level control algorithm module is used for receiving the signal output by the multifunctional power meter module, calculating and outputting Pext and Qext signals according to the received signal, Pref, Qref and Fref;
the converter PCS power distribution module is used for receiving the Pext and Qext signals of the factory layer control algorithm module and distributing PCS _ Pset and PCS _ Qset signals according to the capacity residual value SoC of each independent battery energy storage system;
the PCS virtual synchronous control algorithm module is used for receiving PCS _ Pset and PCS _ Qset signals output by the converter PCS power distribution module and outputting PCS _ Vsup signals and PCS _ Fsup signals according to the received signals;
a Profinet communication module; the PCS _ Delta _ F, PCS _ Pact and PCS _ QACT signal feedback module is used for receiving the signal output by the PCS virtual synchronous control algorithm module and feeding back the PCS _ Delta _ F, PCS _ Pact and PCS _ QACT signals to the PCS virtual synchronous control algorithm module.
Preferably, the number of the PCS virtual synchronous control algorithm modules is 200, and the converter PCS power distribution module inputs the output PCS _ Pset and PCS _ Qset signals into the corresponding PCS virtual synchronous control algorithm modules.
Preferably, the factory level control algorithm module is composed of an active power algorithm submodule and a reactive power control algorithm submodule.
Preferably, an active power algorithm submodule in the factory level control algorithm module compares the obtained Fact signal with the Pref signal, and performs frequency droop characteristic control on the compared signals, the active power algorithm submodule filters the obtained Pact signal, compares the signal after the frequency droop characteristic control, the filtered signal and the Pref signal to obtain a new signal, and sequentially passes through a frequency deviation amplitude limit, an active power proportional-integral controller, an active power set value amplitude limit and an active power control first-order lag to obtain a Pext signal.
Preferably, the reactive power control algorithm submodule in the plant level control algorithm module filters the obtained QAct signal, compares the filtered signal with the Qref signal to obtain a new signal, and the obtained new signal is subjected to reactive power deviation dead zone characteristic control, a reactive power proportional-integral controller, reactive power set value amplitude limiting and reactive power control lead-lag to obtain a Qext signal to be output.
Preferably, the function implementation method of the converter PCS power distribution module is as follows:
preferably, the PCS virtual synchronous control algorithm module consists of an active power control algorithm submodule and a reactive power control algorithm submodule.
Preferably, an active power control algorithm submodule in the PCS virtual synchronous control algorithm module performs damping control on a received PCS _ Delta _ F signal through a PCS virtual speed regulator to obtain a first signal, the active power control algorithm submodule performs droop characteristic control on the received PCS _ Delta _ F signal through the PCS virtual speed regulator to obtain a second signal, the second signal is compared with a PCS _ Pset signal, the compared signal is subjected to deviation and amplitude limitation on active power of the PCS virtual speed regulator and the PCS to obtain a third signal, the active power control algorithm submodule performs filtering on a PCS _ Pact signal to obtain a fourth signal, the first signal, the third signal and the fourth signal are compared to obtain a fifth signal, and the fifth signal is subjected to PCS virtual synchronous active power proportional-integral control and PCS additional frequency set value amplitude limitation to obtain a PCS _ Fsup signal.
Preferably, a reactive power control algorithm submodule in the PCS virtual synchronous control algorithm module compares the received PCS _ Qset signal with the filtered PCS _ QAct signal, and the compared signal is subjected to PCS virtual synchronous reactive power proportional-integral control and PCS additional voltage set value amplitude limitation to obtain a PCS _ Vsup signal.
A control method of a battery energy storage system cluster control device under a weak grid condition is provided, the battery energy storage system cluster control device under the weak grid condition comprises the following steps:
the method comprises the following steps: the device is connected with a large-scale battery energy storage system power grid system structure, and a power storage system converter PCS works in an independent V/F control voltage source working mode;
step two: the multifunctional power meter module in the device measures and inputs measured UAct, Fact, Pact and QACT signals into a factory level control algorithm module;
step three: the factory layer control algorithm module distributes PCS _ Pset and PCS _ Qset signals to the virtual synchronous control algorithm module according to the received signals and the capacity residual value SoC of each independent battery energy storage system;
step four: the Profinet communication module receives PCS _ Pset and PCS _ Qset signals and feeds back PCS _ Delta _ F, PCS _ Pact and PCS _ Qact signals to the PCS virtual synchronous control algorithm module.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the battery energy storage system cluster control device and the control method under the condition of the weak power grid, the energy storage converter works in a voltage source working mode, the power control of the energy storage system under the working mode is realized through a control algorithm, and the energy storage system has the power control characteristic similar to that of a traditional synchronous generator power plant at a high-voltage bus connection point (PoC) through a related transfer function set in the algorithm.
2. The device and the method for controlling the battery energy storage system cluster under the condition of the weak power grid realize the power distribution function between the energy storage converters PCS based on the setting and the control algorithm of the working mode, solve the problem of stable and reliable operation of a large-scale energy storage system under the condition of the weak power grid with low short-circuit capacity, realize seamless switching between grid-connected operation and island operation, provide a virtual inertia stable frequency change rate for the power grid, and realize the active rapid supporting function of transient frequency voltage of a photovoltaic/wind power plant.
Drawings
Fig. 1 is a structure diagram of a power grid system of a large-scale battery energy storage system and an interface schematic diagram of a control device provided by the invention and connected with the control device;
FIG. 2 is a factory level control algorithm module: a functional diagram and a transfer function schematic diagram of sub-modules of an active power control algorithm;
FIG. 3 is a factory level control algorithm module: a reactive power control algorithm submodule functional diagram and a transfer function schematic diagram;
FIG. 4 is a virtual synchronization control algorithm module: a functional diagram and a transfer function schematic diagram of sub-modules of an active power control algorithm;
FIG. 5 is a virtual synchronization control algorithm module: and a reactive power control algorithm submodule functional diagram and a transfer function schematic diagram.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-5, a battery energy storage system cluster control device under weak grid conditions includes:
the multifunctional electric power meter module is used for outputting UAct, Fact, Pact and QACT signals, wherein the UAct signals represent voltage measured in real time at the high-voltage grid-connected point PoC, the unit is V, the Fact signals represent frequency measured in real time at the high-voltage grid-connected point PoC, the unit is HZ, the Pact signals represent active power measured in real time at the high-voltage grid-connected point PoC, the unit is KW, the QACT signals represent reactive power measured in real time at the high-voltage grid-connected point PoC, and the unit is kVar;
and the factory level control algorithm module is used for receiving the signal output by the multifunctional power meter module, calculating and outputting a Pext signal and a Qext signal according to the received signal and Pref, Qref and Fref, wherein the Pref signal represents a set value of active power control at the PoC (Point of connection) point, the unit is kW, the Qref signal represents a set value of reactive power control at the PoC point of connection, the unit is kVar, and the Fref signal represents a frequency reference set value, the unit is: hz, the default value is 50Hz, the Pext signal is the system active power control set value which is output after being calculated by the factory layer control algorithm module, and the Qext signal is the system reactive power control set value which is output after being calculated by the factory layer control algorithm module;
the converter PCS power distribution module is used for receiving Pext and Qext signals of the factory layer control algorithm module and distributing PCS _ Pset and PCS _ Qset signals according to the capacity residual value SoC of each independent battery energy storage system, wherein the PCS _ Pset represents an active power set value of the energy storage converter PCS, and the PCS _ Qset represents a reactive power set value of the energy storage converter PCS;
the PCS virtual synchronous control algorithm module is used for receiving PCS _ Pset and PCS _ Qset signals output by the converter PCS power distribution module and outputting a PCS _ Vsup signal and a PCS _ Fsup signal according to the received signals, wherein the PCS _ Vsup signal represents an additional voltage set value of the energy storage converter PCS, and the PCS _ Fsup signal represents an additional frequency set value of the energy storage converter PCS;
a Profinet communication module; the system is used for receiving a signal output by the PCS virtual synchronous control algorithm module and feeding back PCS _ Delta _ F, PCS _ Pact and PCS _ QACT signals to the PCS virtual synchronous control algorithm module, wherein the PCS _ Delta _ F signal represents the variation of an output frequency actual value and a set frequency value of the energy storage converter PCS, the PCS _ Pact signal represents an output active power actual value of the energy storage converter PCS, the PCS _ QACT signal represents an output reactive power actual value of the energy storage converter PCS, the Profinet communication module supports an industrial Ethernet Profinet IRT isochronous communication protocol, and IRT updating time: 125 us.
The number of the PCS virtual synchronous control algorithm modules is 200, and the converter PCS power distribution module inputs the output PCS _ Pset and PCS _ Qset signals into the corresponding PCS virtual synchronous control algorithm modules.
The factory layer control algorithm module consists of an active power algorithm submodule and a reactive power control algorithm submodule.
The function realization method of the converter PCS power distribution module comprises the following steps:
PCS1_ Pset is an active power set value of the energy storage converter PCS1, SoC1 is a capacity residual value of the battery energy storage system 1, PCSn _ Pset is an active power set value of the energy storage converter PCSn, SoCn is a capacity residual value of the battery energy storage system n, n represents the number of the battery energy storage systems, PCS1_ Qset is a reactive power set value of the energy storage converter PCS1, and PCSn _ Qset is a reactive power set value of the energy storage converter PCSn.
The PCS virtual synchronous control algorithm module consists of an active power control algorithm submodule and a reactive power control algorithm submodule.
A control method of a battery energy storage system cluster control device under the condition of weak power grid comprises the following steps:
the method comprises the following steps: the device is connected with a large-scale battery energy storage system power grid system structure, and a power storage system converter PCS works in an independent V/F control voltage source working mode;
step two: the multifunctional power meter module in the device measures and inputs measured UAct, Fact, Pact and QACT signals into a factory level control algorithm module;
step three: the factory layer control algorithm module distributes PCS _ Pset and PCS _ Qset signals to the virtual synchronous control algorithm module according to the received signals and the capacity residual value SoC of each independent battery energy storage system;
step four: the Profinet communication module receives PCS _ Pset and PCS _ Qset signals and feeds back PCS _ Delta _ F, PCS _ Pact and PCS _ Qact signals to the PCS virtual synchronous control algorithm module.
Fig. 1 shows a structure diagram of a large-scale battery energy storage system grid system and an interface to which a control device according to the present invention is connected, in the diagram, the device measures voltage and current at PoC connection points of 110kv bus bars in a weak grid, current and voltage in the 110kv bus bars flow into 35kv bus bars through a high voltage transformer, current and voltage in the 35kv bus bars flow into the battery energy storage systems, respectively, current and voltage in the battery energy storage systems sequentially pass through a step-up transformer, an energy storage converter, a battery and a BMS and enter an ESSProfinet communication module, signals in the ESSProfinet communication module are input into a Profinet communication module in the device through an optical fiber cable, a rated frequency of the weak grid is 50HZ, and the PLC control module selects siemens S7-1518PLCOpenODK controller and can execute C/C + + code and Matlab/Simulink model algorithm programs; bit operation time: 1 ns; loading a memory: 32 GB; a working memory storage area: 512 MB; profinet irt isochronous communication interface: 4, the number of the channels is 4; the controller executes a cycle: 1 ms; number of Profinet sub-device connections: 256 of the above-mentioned materials.
Figure 2 shows a functional diagram of sub-modules of the active power control algorithm in the plant level control algorithm module together with the transfer function, in this figure, the active power algorithm sub-module in the factory level control algorithm module compares the resulting Fact and Pref signals, and the compared signal is subjected to frequency droop characteristic control, the active power algorithm submodule filters the obtained Pact signal, the signal subjected to frequency droop characteristic control, the filtered signal and the Pref signal are compared to obtain a new signal, the obtained signal is subjected to frequency deviation amplitude limiting, an active power proportional-integral controller, active power set value amplitude limiting and active power control first-order lag in sequence to obtain a Pext signal, s0 in the figure is a plant-level active power-frequency droop characteristic control function including a dead zone characteristic, frequency dead zone values of fdb1 and fdb2, and fdb1 is set to fdb2 to 0.01; dup and Ddn are adjustable droop characteristic slopes, Dup Ddn is set to 0.02; DMax and DMin are output amplitude limiting values, wherein DMax is 10 percent, and DMin is-10 percent; s1 is an active power measurement filtering function, and T4 is a filtering time constant, wherein T4 is set to 0.25S; s2 is a frequency deviation amplitude limiting function, and the Femax frequency deviation upper limit limiting value is set to 10%; setting Femin as-10% for the lower limit of Femin frequency deviation; s3 is an active power proportional-integral controller function, Kpg proportional gain, set Kpg to 0.1; kig integral gain, set Kig-0.05; s4 is an active power set value limiting function, Pmax active power upper limit limiting value is set, and Pmax is set to be 200%; setting Pmin as-200% as the lower limit of active power; s5 is an active power control first-order lag function, and T5 is a lag time constant, where T5 is set to 0.15S.
FIG. 3 shows the plant level control algorithm module: in the figure, a reactive power control algorithm submodule in a factory level control algorithm module filters an obtained QACT signal, compares the filtered signal with a Qref signal to obtain a new signal, and the obtained new signal is subjected to reactive power deviation dead zone characteristic control, a reactive power proportional-integral controller, reactive power set value amplitude limiting and reactive power control lead-lag to obtain a Qext signal needing to be output, S6 is a reactive power measurement filtering function, T1 filtering time constant is set, and T1 is 0.02S; s7 is a reactive power deviation dead zone characteristic control function, and db1 and db2 are dead zone values, and db1 is set to db2 is set to 0.01; s8 is a reactive power proportional-integral controller function, and the Kp proportional gain is set to be 5; ki integral gain, setting Ki to 10; s9 is a reactive power set value amplitude limiting function, and a Qmax reactive power upper limit limiting value is set to be 43.6%; setting a Qmin-43.6% lower limit value of reactive power of Qmin; s10 is a reactive power control lead-lag function, T2 leads a filtering time constant, and T2 is set to be 0.02S; t3 lags the filter time constant, setting T3 to 0.15 s.
FIG. 4 shows a virtual synchronization control algorithm module: in the figure, an active power control algorithm submodule in a PCS virtual synchronous control algorithm module obtains a first signal by damping control of a PCS virtual speed regulator of a received PCS _ Delta _ F signal, the active power control algorithm submodule obtains a second signal by droop characteristic control of the PCS _ Delta _ F signal through the PCS virtual speed regulator, the second signal is compared with a PCS _ Pset signal, the compared signal is subjected to deviation limit radiation of PCS virtual speed regulator and PCS active power to obtain a third signal, the active power control algorithm submodule obtains a fourth signal by filtering a PCS _ Pact signal, the first signal, the third signal and the fourth signal are compared to obtain a fifth signal, the fifth signal is subjected to proportional-integral control of PCS virtual synchronous active power and amplitude limit radiation of a PCS additional frequency set value to obtain a PCS _ Fsup signal, S11 in the figure is the droop characteristic control function of the PCS virtual speed regulator, r is a droop characteristic system, and is set to be 5%; s12 is a PCS virtual speed regulator function, and the Tg speed regulator time constant is set to be 0.25S; s13 is a damping control function of the PCS virtual speed regulator, KD is a damping system, and KD is set to be 0.75; s14 is a PCS active power deviation limit function, Pmax deviation upper limit is limited, and Pmax is set to 120%; limiting the lower limit of the Pmin deviation, and setting the Pmin to-120%; s15 is a PCS virtual synchronous active power proportional-integral control function, PKp proportional gain, set Kpg to 0.04; PKi integral gain, setting PKi 0.04; s16 is a PCS additional frequency set value limiting function, SFmax additional frequency upper limit limiting value is set, and SFmax is set to be 20%; adding an SFmin lower limit value, and setting the SFmin to be-20%; s17 is a low-pass filtering function of the actual value of the PCS active power, z is a damping ratio, and z is set to be 0.707; w is the characteristic frequency, and w is set to 5.
FIG. 5 shows a virtual synchronization control algorithm module: in the figure, a reactive power control algorithm submodule in a PCS virtual synchronous control algorithm module compares a received PCS _ Qset signal with a filtered PCS _ Qact signal, the compared signal is subjected to PCS virtual synchronous reactive power proportional-integral control and PCS additional voltage set value amplitude limitation to obtain a PCS _ Vsup signal, S18 in the figure is a PCS reactive power actual value low-pass filtering function, z is a damping ratio, and z is set to be 0.707; w is a characteristic frequency, and w is set to be 5; s19 is a PCS virtual synchronous reactive power proportional-integral control function, QKp proportional gain, setting QKp to 0.1; QKi integral gain, set QKi-0.5; s20 is a PCS additional voltage set value amplitude limiting function, SVmax additional frequency upper limit limiting value is added, and SVmax is set to be 50%; SVmin is added with a lower limit value of frequency, and is set to be-50%.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. The utility model provides a battery energy storage system cluster controlling means under weak electric wire netting condition which characterized in that includes:
the multifunctional power meter module is used for outputting UAct, Fact, Pact and QACT signals, wherein UAct represents the voltage measured in real time at the PoC of the high-voltage grid-connected point, Fact represents the frequency measured in real time at the PoC of the high-voltage grid-connected point, Pact represents the active power measured in real time at the PoC of the high-voltage grid-connected point, and QACT signals represent the reactive power measured in real time at the PoC of the high-voltage grid-connected point;
a factory layer control algorithm module for receiving the signal output by the multifunctional power meter module, calculating and outputting a Pext signal and a Qext signal according to the received signal and Pref, Qref and Fref, wherein the Pext signal is a system active power control set value output after calculation by the factory layer control algorithm module, the Qext signal is a system reactive power control set value output after calculation by the factory layer control algorithm module, Pref represents a set value for active power control at a high-voltage grid-connected point PoC, Qref represents a set value for reactive power control at the high-voltage grid-connected point PoC, and Fref represents a frequency reference set value;
the plant layer control algorithm module consists of an active power algorithm submodule and a reactive power control algorithm submodule, the active power algorithm submodule in the plant layer control algorithm module carries out subtraction on obtained Fref and Fact signals and carries out frequency droop characteristic control on the signals subjected to subtraction, the active power algorithm submodule adds the signals subjected to frequency droop characteristic control to the Pref signals to subtract the filtered Pact signals to obtain a new signal, and the obtained new signal sequentially passes through a frequency deviation amplitude limiting block, an active power proportional-integral controller, an active power set value amplitude limiting block and active power control first-order lag to obtain a Pext signal; filtering the obtained QACT signal by a reactive power control algorithm submodule in the factory layer control algorithm module, and subtracting the Qref signal from the filtered signal to obtain a new signal, wherein the obtained new signal is subjected to reactive power deviation dead zone characteristic control, a reactive power proportional-integral controller, reactive power set value amplitude limiting and reactive power control lead-lag to obtain a Qext signal needing to be output;
the converter PCS power distribution module is used for receiving the Pext and Qext signals of the factory layer control algorithm module and distributing PCS _ Pset and PCS _ Qset signals according to the capacity residual value SoC of each independent battery energy storage system, wherein the PCS _ Pset represents an active power set value of the energy storage converter PCS, and the PCS _ Qset represents a reactive power set value of the energy storage converter PCS;
the PCS virtual synchronous control algorithm module is used for receiving PCS _ Pset and PCS _ Qset signals output by the converter PCS power distribution module and outputting a PCS _ Vsup signal and a PCS _ Fsup signal according to the received signals, wherein the PCS _ Vsup signal represents an additional voltage set value of the energy storage converter PCS, and the PCS _ Fsup signal represents an additional frequency set value of the energy storage converter PCS;
the PCS virtual synchronous control algorithm module consists of an active power control algorithm submodule and a reactive power control algorithm submodule, wherein the active power control algorithm submodule in the PCS virtual synchronous control algorithm module controls a received PCS _ Delta _ F signal to obtain a first signal through a PCS virtual speed regulator to damp, the active power control algorithm submodule controls the received PCS _ Delta _ F signal to obtain a second signal through the droop characteristic of the PCS virtual speed regulator, a PCS _ Pset signal is differed with the second signal, the differenced signal passes through the PCS virtual speed regulator and a PCS active power deviation limit to obtain a third signal, the active power control algorithm submodule filters a PCS _ Pact signal to obtain a fourth signal, the third signal subtracts the first signal and the fourth signal to obtain a fifth signal, the fifth signal passes through PCS virtual synchronous active power proportional integral control and a PCS additional frequency set value limit to obtain a PCS _ Fsup signal, and a reactive power control algorithm submodule in the PCS virtual synchronous control algorithm module makes a difference between the received PCS _ Qset signal and the filtered PCS _ QACT signal, and performs PCS virtual synchronous reactive power proportional-integral control and PCS additional voltage set value amplitude limiting on the signal subjected to the difference to obtain a PCS _ Vsup signal.
A Profinet communication module; the PCS-QACT signal is used for receiving a signal output by the PCS virtual synchronous control algorithm module and feeding back a PCS _ Delta _ F, PCS _ Pact signal and a PCS _ QACT signal to the PCS virtual synchronous control algorithm module, the PCS _ Delta _ F signal represents the deviation of an actual output frequency value of the energy storage converter PCS and a set frequency value, the PCS _ Pact signal represents an actual output active power value of the energy storage converter PCS, and the PCS _ QACT signal represents an actual output reactive power value of the energy storage converter PCS.
2. The device for controlling the battery energy storage system cluster under the weak grid condition as claimed in claim 1, wherein: the number of the PCS virtual synchronous control algorithm modules is 200, and the converter PCS power distribution module inputs the output PCS _ Pset and PCS _ Qset signals into the corresponding PCS virtual synchronous control algorithm modules.
3. The device for controlling the battery energy storage system cluster under the weak grid condition as claimed in claim 1, wherein: the function realization method of the converter PCS power distribution module comprises the following steps:
PCS1_ Pset is an active power set value of the energy storage converter PCS1, SoC1 is a capacity residual value of the battery energy storage system 1, PCSn _ Pset is an active power set value of the energy storage converter PCSn, SoCn is a capacity residual value of the battery energy storage system n, n represents the number of the battery energy storage systems, PCS1_ Qset is a reactive power set value of the energy storage converter PCS1, and PCSn _ Qset is a reactive power set value of the energy storage converter PCSn.
4. A method for controlling a battery energy storage system cluster under the condition of a weak power grid is applied to the battery energy storage system cluster control device under the condition of the weak power grid of any one of claims 1 to 3, and comprises the following steps:
the method comprises the following steps: the device is connected with a large-scale battery energy storage system power grid system structure, and the energy storage converter PCS works in an independent V/F control voltage source working mode;
step two: the multifunctional power meter module in the device measures and inputs measured UAct, Fact, Pact and QACT signals into a factory level control algorithm module;
step three: the converter PCS power distribution module distributes PCS _ Pset and PCS _ Qset signals to the PCS virtual synchronous control algorithm module according to the received signals and the capacity residual value SoC of each independent battery energy storage system;
step four: the Profinet communication module receives PCS _ Vsup and PCS _ Fsup signals output by the PCS virtual synchronous control algorithm module and feeds back PCS _ Delta _ F, PCS _ Pact and PCS _ Qact signals to the PCS virtual synchronous control algorithm module.
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