CN114844174A - Interphase SOC (System on chip) balance control method and system for cascaded H-bridge energy storage system - Google Patents
Interphase SOC (System on chip) balance control method and system for cascaded H-bridge energy storage system Download PDFInfo
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- CN114844174A CN114844174A CN202210633715.5A CN202210633715A CN114844174A CN 114844174 A CN114844174 A CN 114844174A CN 202210633715 A CN202210633715 A CN 202210633715A CN 114844174 A CN114844174 A CN 114844174A
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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
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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Abstract
The invention discloses an interphase SOC balance control method and system for a cascade H-bridge energy storage system，Obtaining respective original modulation waves of three phases after closed-loop control of a control system; generating a modulation wave regulating quantity shared by the three phases according to the respective voltage, current and average SOC information of the three phases; and finally, adding the original modulation waves of the three phases with the modulation wave adjustment quantity shared by the three phases respectively to obtain final modulation waves of the three phases respectively, and balancing the SOC among the three phases through the final modulation waves. The invention takes the cascaded H-bridge energy storage system as an object, and adjusts respective modulation waves of three phases by acquiring three-phase current and three-phase SOC information, thereby realizing the aim of interphase SOC balance and improving the comprehensive efficiency and online time of the whole energy storage system.
Description
Technical Field
The invention relates to a battery energy storage system, in particular to an interphase SOC balance control method and system for a cascade H-bridge energy storage system.
Background
The battery energy storage system mainly realizes the storage and the release of energy, 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 (PCS) consisting of Power electronic devices, and the PCS mainly realizes the functions of charge and discharge control, Power regulation and the like. The cascaded H-bridge type energy storage system has the advantages of modular structure, high set 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 for ensuring the operation availability and the service life of the energy storage system. In the cascade H-bridge type energy storage system, due to the difference of the three-phase energy storage batteries themselves and the possible reasons of maintenance, update, etc., the states of charge SOC of the three-phase energy storage batteries are different. In order to utilize the battery capacity of the energy storage system to the maximum extent and guarantee the service life of the battery, the SOC of the energy storage battery among three phases needs to be balanced and controlled, otherwise, the whole energy storage system is shut down due to over-charging or over-discharging of a certain phase, and the zero sequence voltage injection strategy in the prior art has the problems of complex calculation and slow balancing speed.
Disclosure of Invention
The invention aims to provide an interphase SOC balance control method and system for a cascade H-bridge energy storage system, which are used for solving the problems that in the prior art, a zero sequence voltage calculation formula 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 purpose, the invention provides an interphase SOC balance control method for a cascade H-bridge energy storage system, which is characterized in that three-phase voltages and currents of the energy storage system and energy storage battery SOC information of all three-phase H-bridge power units are collected, and after calculation, respective modulation waves of the three phases are adjusted so as to balance SOC among the three phases, and the method specifically comprises the following steps:
s1: receiving a power instruction value issued to the energy storage system, simultaneously acquiring respective voltages of three phases and respective currents of the three phases, acquiring SOC information of an 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 a power real-time value of the energy storage system according to the acquired respective voltages and currents of the three phases;
s3: obtaining original modulation waves of the three phases through closed-loop control of a control system according to the obtained power command value, the voltage of each of the three phases, the current of each of the three phases and the real-time power value calculated in the step S2;
s4: generating a modulation wave regulating 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 original modulation waves of the three phases with the modulation wave adjustment quantity shared by the three phases to obtain final modulation waves of the three phases, and balancing the SOC among the three phases through the final modulation waves.
The invention also provides an interphase SOC balance control system for the cascade H-bridge energy storage system, which comprises an acquisition unit, a calculation unit and an interphase SOC balance control unit:
the acquisition unit is used for receiving a power instruction value issued to the energy storage system, acquiring respective voltages of three phases and respective currents of the three phases, and acquiring SOC information of the energy storage battery in each phase of each H-bridge power unit through the battery management system;
the calculating unit is used for calculating the real-time power value of the energy storage system according to the respective voltage and current of the three phases acquired by the acquiring unit, and calculating the respective average SOC information of the three phases according to the SOC information of the energy storage battery in each phase of H-bridge power unit acquired by the acquiring unit;
the interphase SOC balance control unit is used for generating original modulation waves of the three phases according to the power command value, the voltages and the currents of the three phases and the real-time power value obtained by the calculation unit, then generating modulation wave adjustment quantities shared by the three phases according to the voltages and the currents of the three phases obtained by the acquisition unit and the average SOC information of the three phases obtained by the calculation unit, finally adding the original modulation waves of the three phases and the modulation wave adjustment quantities shared by the three phases to obtain final modulation waves of the three phases, and balancing the SOC among the three phases through the final modulation waves.
Average SOC information of each of the three phases
Comprises the following steps:
wherein N is x X is the number of the energy storage batteries which are put into operation before being equivalent, x is a phase a, b or c, and SOC xi The SOC information of an energy storage battery in the ith x-phase H-bridge power unit is that i is more than 0 and is less than or equal to N x 。
The modulation wave adjustment quantity Deltau shared by the three phases mod Comprises the following steps:
wherein k is an interphase balance coefficient,
is the respective average electrical quantities of the three phases, i a 、i b 、i c Are three phases of respective currents.
And the interphase balance coefficient k is set according to the required interphase balance 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 the inconsistency of the three-phase SOC is eliminated by adjusting the three-phase modulation wave, and the utilization rate of the whole energy storage system is improved;
(2) the calculation formula of the adjustment quantity of the three-phase modulation wave 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 interphase SOC balance speed can be set according to the required balance speed and the current limit value of the energy storage system, and balance can be realized 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 interphase SOC balance control method applicable to a cascaded H-bridge type energy storage system;
FIG. 3 is a schematic diagram of an interphase SOC balance control system suitable for a cascaded H-bridge type energy storage system.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The embodiment provides an interphase SOC equalization control method suitable for a cascaded H-bridge energy storage system, as shown in fig. 1, in an a, b, c three-phase star connection of the cascaded H-bridge energy storage system, 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, the method 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 respective voltages u of the three phases are obtained through a voltage acquisition unit a 、u b And u c Obtaining respective currents i of three phases through a current acquisition unit a 、i b And i c ；
Obtaining the SOC information SOC of the energy storage battery in each phase of H-bridge power unit through a battery management system xi The SOC of the chip xi Is SOC information of the ith x-phase H-bridge power unit, i is more than 0 and less than or equal to N x ，N x X is the number of energy storage batteries which are put into operation before being equivalent to x, and x is a phase a, a phase b or a phase c;
and calculating to obtain the respective average SOC information of three phases
S2: according to the obtained respective voltages u of the three phases a 、u b 、u c And the respective currents i of the three phases a 、i b 、i c Calculating power real-time values P and Q of the energy storage system;
s3: according to the obtained power instruction value P ref And Q ref Respective voltages u of three phases a 、u b 、u c Three phases of respective currents i a 、i b 、i c And step S2, obtaining respective original modulation wave u of three phases after closed-loop control of the control system by the power real-time values P and Q obtained by calculation moda 、u modb And u modc ；
S4: according to respective voltages u of three phases a 、u b 、u c Three phases of respective currents i a 、i b 、i c And the calculated average SOC information of each of the three phases
Generation of modulation wave adjustment quantity delta common to three phasesu mod The modulation wave adjustment quantity Deltau shared by the three phases mod Comprises the following steps:
k is an interphase balance coefficient, and the coefficient can be set according to the required interphase balance speed and the current limit value of the energy storage system;
s5: the original modulated waves u of three phases are respectively transmitted moda 、u modb And u modc Respectively with a common modulation wave adjustment quantity Deltau u mod Adding the three phases to obtain final modulated waves u' moda 、u' modb And u' modc And equalizing the SOC between the three phases through the final modulation wave;
wave u 'finally prepared' moda 、u' modb And u' modc Comprises the following steps:
as shown in fig. 3, the inter-phase SOC equalization control system applicable to the cascaded H-bridge energy storage system of the present invention specifically includes an acquisition unit, a calculation unit, and an inter-phase SOC equalization 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 u of each of the three phases is acquired by a voltage acquisition unit a 、u b And u c Obtaining respective currents i of three phases through a current acquisition unit a 、i b And i c Acquiring SOC information of the energy storage battery in each phase of H-bridge power unit through a battery management system xi The SOC of the chip xi Is SOC information of the ith x-phase H-bridge power unit, i is more than 0 and less than or equal to N x ，N x X is the number of energy storage batteries which are put into operation before being equivalent to x, and x is a, b or c;
the computing unit is used for obtaining according to the acquisition unitTaking respective voltages u of three phases a 、u b 、u c And the respective currents i of the three phases a 、i b 、i c Calculating power real-time values P and Q of the energy storage system, and acquiring SOC information SOC of the energy storage battery in each phase of H-bridge power unit according to the acquisition unit xi Respectively calculating the average SOC information of each of the three phases
The interphase SOC balance control unit is used for obtaining a power instruction value P according to the acquisition unit ref And Q ref Respective voltages u of three phases a 、u b 、u c Three phases of respective currents i a 、i b 、i c And generating original modulation waves u of three phases by the real-time power values P and Q obtained by the calculating unit moda 、u modb And u modc Then according to the respective voltage u of the three phases obtained by the acquisition unit a 、u b 、u c Three phases of respective currents i a 、i b 、i c And the average SOC information of each of the three phases obtained by the calculating unit
Generating three-phase common modulation wave adjustment quantity delta u mod Finally, the original modulated waves u of the three phases are respectively moda 、u modb And u modc Modulation wave adjustment quantity Deltau u shared with three phases respectively mod After addition, three phases of final modulated waves u 'are obtained' moda 、u' modb And u' modc And equalizes the SOC between the three phases by the final modulation wave.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (8)
1. An interphase SOC balance control method for a cascade H-bridge energy storage system comprises three-phase wiring, each phase is composed of a plurality of power units, and each power unit is provided with an independent energy storage battery unit, and is characterized by comprising the following steps:
s1: receiving a power instruction value issued to the energy storage system, simultaneously acquiring respective voltages of three phases and respective currents of the three phases, acquiring SOC information of an 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 a power real-time value of the energy storage system according to the acquired respective voltages and currents of the three phases;
s3: obtaining original modulation waves of the three phases through closed-loop control of a control system according to the obtained power command value, the voltage of each of the three phases, the current of each of the three phases and the real-time power value calculated in the step S2;
s4: generating a modulation wave regulating 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 original modulation waves of the three phases with the modulation wave adjustment quantity shared by the three phases to obtain final modulation waves of the three phases, and balancing the SOC among the three phases through the final modulation waves.
2. The method for controlling interphase SOC balance of the cascaded H-bridge energy storage system according to claim 1, wherein the average SOC information of each of the three phases
Comprises the following steps:
wherein N is x X is the number of the energy storage batteries which are put into operation before being equivalent to the number of the energy storage batteries, and x is a phase a, a phase b or a phase c，SOC xi The SOC information of an energy storage battery in the ith x-phase H-bridge power unit is that i is more than 0 and is less than or equal to N x 。
3. The method for controlling the interphase SOC balance of the cascaded H-bridge energy storage system according to claim 1, wherein the three-phase common modulation wave adjustment quantity Δ u mod Comprises the following steps:
wherein k is an interphase balance coefficient,
is the respective average electrical quantities of the three phases, i a 、i b 、i c Are three phases of respective currents.
4. The method for controlling the interphase SOC balance of the cascaded H-bridge energy storage system according to claim 3, wherein the interphase balance coefficient k is set according to a required interphase balance speed and a current limit value of the energy storage system.
5. The utility model provides an interphase SOC balanced control system for cascading H bridge energy storage system which characterized in that, control system includes acquisition element, computational element and interphase SOC balanced control unit:
the acquisition unit is used for receiving a power instruction value issued to the energy storage system, acquiring respective voltages of three phases and respective currents of the three phases, and acquiring SOC information of the energy storage battery in each phase of each H-bridge power unit through the battery management system;
the calculating unit is used for calculating the real-time power value of the energy storage system according to the respective voltage and current of the three phases acquired by the acquiring unit, and calculating the respective average SOC information of the three phases according to the SOC information of the energy storage battery in each phase of H-bridge power unit acquired by the acquiring unit;
the interphase SOC balance control unit is used for generating original modulation waves of the three phases according to the power instruction value, the voltages and the currents of the three phases and the real-time power value obtained by the calculation unit, generating modulation wave regulating quantities shared by the three phases according to the voltages and the currents of the three phases and average SOC information of the three phases, and finally adding the original modulation waves of the three phases and the modulation wave regulating quantities shared by the three phases to obtain final modulation waves of the three phases and balancing the SOC among the three phases through the final modulation waves.
6. The inter-phase SOC balance control system for a cascaded H-bridge energy storage system according to claim 5, wherein the respective average SOC information of the three phases
Comprises the following steps:
wherein N is x X is the number of the energy storage batteries which are put into operation before being equivalent, x is a phase a, b or c, and SOC xi The SOC information of an energy storage battery in the ith x-phase H-bridge power unit is that i is more than 0 and is less than or equal to N x 。
7. The system as claimed in claim 5, wherein the three-phase common modulation wave adjustment quantity Δ u is a phase-to-phase SOC balance control system for the cascaded H-bridge energy storage system mod Comprises the following steps:
wherein k is an interphase balance coefficient,
is the respective average electrical quantities of the three phases, i a 、i b 、i c Are three phases of respective currents.
8. The inter-phase SOC balance control system for the cascade H-bridge energy storage system as claimed in claim 7, wherein the inter-phase balance coefficient k is set according to the required inter-phase balance speed and the current limit value of the energy storage system.
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