CN114844174B - Interphase SOC balance control method and system for cascade H-bridge energy storage system - Google Patents
Interphase SOC balance control method and system for cascade H-bridge energy storage system Download PDFInfo
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- CN114844174B CN114844174B CN202210633715.5A CN202210633715A CN114844174B CN 114844174 B CN114844174 B CN 114844174B CN 202210633715 A CN202210633715 A CN 202210633715A CN 114844174 B CN114844174 B CN 114844174B
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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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
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Abstract
The invention discloses an inter-phase SOC balance control method and system for a cascade H-bridge energy storage system, which are characterized in that firstly, according to a power instruction value, respective voltages and currents of three phases and a power real-time value，The three-phase original modulation waves are obtained after the closed-loop control of the control system; generating a modulation wave adjustment quantity shared by the three phases according to the respective voltage, current and average SOC information of the three phases; and finally, adding the respective original modulation waves of the three phases with modulation wave adjustment amounts shared by the three phases respectively to obtain respective final modulation waves of the three phases, and balancing the SOC between the three phases through the final modulation waves. The invention takes the cascade H-bridge energy storage system as an object, and three-phase current and three-phase SOC information are collected, so that respective modulation waves of three phases are regulated, the purpose of inter-phase SOC balance is realized, and the comprehensive efficiency and the online time length of the whole energy storage system are improved.
Description
Technical Field
The invention relates to a battery energy storage system, in particular to an inter-phase SOC balance control method and system for a cascade H-bridge energy storage system.
Background
The battery energy storage system mainly realizes energy storage and release, can effectively improve the power generation utilization rate of new energy, smooth active power fluctuation and realize peak clipping and valley filling. The main components of the system comprise an energy storage battery and an energy storage power conversion system (Power Conversion System, PCS) which is composed of power electronic devices, and the PCS mainly realizes functions of charge and discharge control, power regulation and the like. The cascade H-bridge energy storage system has the advantages of modularized structure, high complete efficiency and the like, has wide application prospect in high-voltage high-capacity occasions, and the control strategy directly influences the performance and reliability of the energy storage system.
The balance control of the energy storage system is important to ensure the operation availability and service life of the energy storage system. In the cascade H-bridge type energy storage system, the states of charge SOC of the three-phase energy storage batteries are not the same due to differences in the three-phase energy storage batteries themselves and possible maintenance, update, and the like. In order to maximally utilize the battery capacity of the energy storage system and ensure the service life of the battery, the SOC of the energy storage battery among three phases needs to be balanced, otherwise, the whole energy storage system is stopped due to overcharge or overdischarge of a certain phase, and the zero sequence voltage injection strategy in the prior art has the problems of complex calculation and slower balancing speed.
Disclosure of Invention
The invention aims to provide an inter-phase SOC balance control method and system for a cascade H-bridge energy storage system, which are used for solving the problems that a zero sequence voltage calculation formula in the prior art is complex and the balance speed cannot be adjusted, so that the control strategy of the energy storage system is simplified.
In order to achieve the above purpose, the invention provides an inter-phase SOC balance control method for a cascade H-bridge energy storage system, which comprises the steps of collecting three-phase voltage and current of the energy storage system and SOC information of energy storage batteries of all three-phase H-bridge power units, and adjusting respective modulation waves of the three phases after calculation to balance SOCs among the three phases, wherein the method specifically comprises the following steps:
s1: receiving a power instruction value issued to an energy storage system, simultaneously acquiring respective voltages and respective currents of the three phases, acquiring the SOC information of the energy storage battery in each H-bridge power unit of each phase through a battery management system, and calculating to obtain respective average SOC information of the three phases;
s2: calculating the power real-time value of the energy storage system according to the acquired respective voltages and respective currents of the three phases;
s3: according to the obtained power command value, the respective voltages of the three phases, the respective currents of the three phases and the power real-time value obtained by calculation in the step S2, the respective original modulation waves of the three phases are obtained after closed-loop control of a control system;
s4: generating a modulation wave adjustment quantity shared by the three phases according to the respective voltages of the three phases, the respective currents of the three phases and the calculated average SOC information of the three phases;
s5: and adding the three-phase original modulation waves and the modulation wave adjustment quantity shared by the three phases respectively to obtain three-phase final modulation waves, and balancing the SOC among the three phases through the final modulation waves.
The invention further provides an inter-phase SOC balance control system for the cascade H-bridge energy storage system, which comprises an acquisition unit, a calculation unit and an inter-phase SOC balance control unit:
the acquisition unit is used for receiving the power instruction value issued to the energy storage system, simultaneously acquiring respective voltages of three phases and respective currents of the three phases, and acquiring the SOC information of the energy storage battery in each H-bridge power unit of each phase through the battery management system;
the computing unit is used for computing power real-time values of the energy storage system according to the respective voltages of the three phases and the respective currents of the three phases, which are acquired by the acquisition unit, and computing respective average SOC information of the three phases according to the SOC information of the energy storage battery in each H-bridge power unit of each phase, which is acquired by the acquisition unit;
the interphase SOC balance control unit is used for generating three-phase original modulation waves according to the power command value obtained by the acquisition unit, the three-phase voltage, the three-phase current and the power real-time value obtained by the calculation unit, generating three-phase common modulation wave adjustment quantity according to the three-phase voltage obtained by the acquisition unit, the three-phase current and the three-phase average SOC information obtained by the calculation unit, and finally adding the three-phase original modulation waves and the three-phase common modulation wave adjustment quantity to obtain three-phase final modulation waves and balancing the SOCs among the three phases through the final modulation waves.
Average SOC information of each of the three phases
The method comprises the following steps:
wherein N is x The number of the energy storage batteries is equal to x, x is a, b or c phase, and the SOC xi For the SOC information of the energy storage battery in the ith H bridge power unit of the x phase, i is more than 0 and less than or equal to N x 。
The modulation wave adjustment quantity Deltau shared by the three phases mod The method comprises the following steps:
wherein k is an inter-phase equalization coefficient,
i is the average SOC information of each three phases a 、i b 、i c Three phases of respective currents.
The inter-phase equalization coefficient k is set according to the required inter-phase equalization speed and the current limit value of the energy storage system.
The invention has the beneficial effects that:
(1) According to the invention, the adverse effect caused by inconsistent three-phase SOC is eliminated by adjusting the three-phase modulation wave, so that the utilization rate of the whole energy storage system is improved;
(2) The three-phase modulation wave adjustment amount calculation formula is simpler and more convenient, the control system is simpler to realize, and the complexity of the control system can be effectively reduced;
(3) The inter-phase SOC balance speed can be set according to the required balance speed and the current limit value of the energy storage system, and can realize balance more quickly.
Drawings
FIG. 1 is a block diagram of a cascaded H-bridge energy storage system in an embodiment;
FIG. 2 is a flow chart of an inter-phase SOC balance control method suitable for a cascade H-bridge type energy storage system;
fig. 3 is a schematic diagram of an inter-phase SOC equalization control system suitable for use in a cascaded H-bridge energy storage system in accordance with the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The embodiment provides an inter-phase SOC balance control method suitable for a cascade H-bridge energy storage system, as shown in fig. 1, where each phase is composed of N power units, each power unit is provided with an independent energy storage battery unit, as shown in fig. 2 and 3, and specifically includes the following steps:
s1: receiving a power instruction value P issued by an automatic power generation control end AGC and an automatic voltage control end AVC to an energy storage system ref And Q ref ；
Simultaneously, the voltage acquisition unit acquires the respective voltages u of the three phases a 、u b And u c Acquiring respective three-phase currents i through a current acquisition unit a 、i b And i c ；
Acquiring each H-bridge power unit of each phase through battery management systemSOC information SOC of energy storage battery xi The SOC is xi SOC information of the ith H bridge power unit of x phases is that i is more than 0 and less than or equal to N x ，N x The number of the energy storage batteries which are put into operation before is equal to x, and x is a, b or c phase;
and calculate and obtain the respective average SOC information of three phases
S2: based on the acquired voltages u of the three phases a 、u b 、u c Three-phase current i a 、i b 、i c Calculating power real-time values P and Q of the energy storage system;
s3: according to the obtained power command value P ref And Q ref Three-phase respective voltages u a 、u b 、u c Three-phase respective current i a 、i b 、i c And step S2, calculating power real-time values P and Q, and obtaining three-phase original modulation waves u after closed-loop control of a control system moda 、u modb And u modc ；
S4: according to the respective voltages u of the three phases a 、u b 、u c Three-phase respective current i a 、i b 、i c And the calculated average SOC information of each of the three phases
Generating a modulation wave adjustment quantity Deltau shared by three phases mod The modulation wave adjustment quantity Deltau shared by the three phases mod The method comprises the following steps:
k is an inter-phase equalization coefficient which can be set according to the required inter-phase equalization speed and the current limit value of the energy storage system;
s5: the three phases of the original modulated wave u moda 、u modb And u modc Modulation wave adjustment amounts Deltau respectively shared with mod Adding, calculating to obtain three-phase final modulation wave u' moda 、u' modb And u' modc And equalizing the SOCs between the three phases by the final modulation wave;
the final modulated wave u' moda 、u' modb And u' modc The method comprises the following steps:
as shown in fig. 3, the interphase SOC balance control system suitable for the cascade H-bridge energy storage system of the present invention specifically includes an acquisition unit, a calculation unit and an interphase SOC balance control unit:
the acquisition unit is used for receiving a power instruction value P issued by the automatic power generation control end AGC and the automatic voltage control end AVC to the energy storage system ref And Q ref Simultaneously, the voltage acquisition unit acquires the respective voltages u of the three phases a 、u b And u c Acquiring respective three-phase currents i through a current acquisition unit a 、i b And i c Acquiring SOC information SOC of energy storage batteries in each H-bridge power unit of each phase through a battery management system xi The SOC is xi SOC information of the ith H bridge power unit of x phases is that i is more than 0 and less than or equal to N x ，N x The number of the energy storage batteries which are put into operation before is equal to x, and x is a, b or c;
the calculating unit is used for obtaining the respective voltages u of the three phases according to the acquisition unit a 、u b 、u c Three-phase current i a 、i b 、i c Calculating power real-time values P and Q of the energy storage system, and obtaining SOC information SOC of the energy storage battery in each H-bridge power unit of each phase according to the acquisition unit xi Calculating average SOC information of each of three phases
The interphase SOC balance control unit is used for controlling the power command value P according to the power command value P obtained by the acquisition unit ref And Q ref Three-phase respective voltages u a 、u b 、u c Three-phase respective current i a 、i b 、i c And the power real-time values P and Q obtained by the calculation unit generate three-phase original modulation waves u moda 、u modb And u modc Then according to the respective voltages u of the three phases obtained by the acquisition unit a 、u b 、u c Three-phase respective current i a 、i b 、i c And the average SOC information of each of the three phases obtained by the calculation unit
Generating a modulation wave adjustment quantity Deltau shared by three phases mod Finally, the three phases of original modulation waves u moda 、u modb And u modc Modulation wave adjustment amounts Deltau respectively shared with three phases mod After addition, three-phase final modulation waves u 'are obtained' moda 、u' modb And u' modc And equalizes the SOCs between the three phases by the final modulated wave.
The present embodiment is only for explanation of the present invention and is not to be construed as limiting the present invention, and modifications to the present embodiment, which may not creatively contribute to the present invention as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present invention.
Claims (4)
1. The interphase SOC balance control method for the cascade H-bridge energy storage system comprises three-phase wiring, each phase consists of a plurality of power units, and each power unit is provided with an independent energy storage battery unit, and the interphase SOC balance control method is characterized by comprising the following steps:
s1: receiving a power instruction value issued to an energy storage system, simultaneously acquiring respective voltages and respective currents of the three phases, acquiring the SOC information of the energy storage battery in each H-bridge power unit of each phase through a battery management system, and calculating to obtain respective average SOC information of the three phases;
s2: calculating the power real-time value of the energy storage system according to the acquired respective voltages and respective currents of the three phases;
s3: according to the obtained power command value, the respective voltages of the three phases, the respective currents of the three phases and the power real-time value obtained by calculation in the step S2, the respective original modulation waves of the three phases are obtained after closed-loop control of a control system;
s4: generating a modulation wave adjustment quantity shared by the three phases according to the respective voltages of the three phases, the respective currents of the three phases and the calculated average SOC information of the three phases;
the modulation wave adjustment quantity Deltau shared by the three phases mod The method comprises the following steps:
k is an inter-phase equalization coefficient, and the inter-phase equalization coefficient k is set according to the required inter-phase equalization speed and the current limit value of the energy storage system;
i is the average SOC information of each three phases a 、i b 、i c Is three-phase current respectively;
s5: and adding the three-phase original modulation waves and the modulation wave adjustment quantity shared by the three phases respectively to obtain three-phase final modulation waves, and balancing the SOC among the three phases through the final modulation waves.
2. The method for phase-to-phase SOC balance control for a cascaded H-bridge energy storage system of claim 1, wherein the three phases are each provided with average SOC information
The method comprises the following steps:
wherein N is x The number of the energy storage batteries is equal to x, x is a, b or c phase, and the SOC xi For the SOC information of the energy storage battery in the ith H bridge power unit of the x phase, i is more than 0 and less than or equal to N x 。
3. An inter-phase SOC balance control system for a cascade H-bridge energy storage system is characterized by comprising an acquisition unit, a calculation unit and an inter-phase SOC balance control unit:
the acquisition unit is used for receiving the power instruction value issued to the energy storage system, simultaneously acquiring respective voltages of three phases and respective currents of the three phases, and acquiring the SOC information of the energy storage battery in each H-bridge power unit of each phase through the battery management system;
the computing unit is used for computing power real-time values of the energy storage system according to the respective voltages of the three phases and the respective currents of the three phases, which are acquired by the acquisition unit, and computing respective average SOC information of the three phases according to the SOC information of the energy storage battery in each H-bridge power unit of each phase, which is acquired by the acquisition unit;
the interphase SOC balance control unit is used for generating three-phase original modulation waves according to the power command value obtained by the acquisition unit, the three-phase respective voltage, the three-phase respective current and the power real-time value obtained by the calculation unit, and then generating three-phase common modulation wave adjustment quantity according to the three-phase respective voltage obtained by the acquisition unit, the three-phase respective current and the three-phase respective average SOC information obtained by the calculation unit;
the modulation wave adjustment quantity Deltau shared by the three phases mod The method comprises the following steps:
wherein,,k is an inter-phase equalization coefficient, the inter-phase equalization coefficient k is set according to the required inter-phase equalization speed and the current limit value of the energy storage system,
i is the average SOC information of each three phases a 、i b 、i c Is three-phase current respectively;
and finally, adding the respective original modulation waves of the three phases with modulation wave adjustment amounts shared by the three phases respectively to obtain respective final modulation waves of the three phases, and balancing the SOC between the three phases through the final modulation waves.
4. The phase-to-phase SOC equalization control system for a cascaded H-bridge energy storage system of claim 3, wherein said three phases each have average SOC information
The method comprises the following steps:
wherein N is x The number of the energy storage batteries is equal to x, x is a, b or c phase, and the SOC xi For the SOC information of the energy storage battery in the ith H bridge power unit of the x phase, i is more than 0 and less than or equal to N x 。
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| CN107154741B (en) * | 2017-05-18 | 2019-06-07 | 北京交通大学 | A kind of control system and method based on MMC topological structure |
| CN110797947A (en) * | 2019-11-15 | 2020-02-14 | 国网江苏省电力有限公司盐城供电分公司 | Energy storage battery equalization control system based on voltage injection |
| CN111211572A (en) * | 2020-02-20 | 2020-05-29 | 河南理工大学 | Energy balance control method for cascaded H-bridge type energy storage system |
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