CN113507151B - SoC cooperative control method applied to multiple energy storage units - Google Patents
SoC cooperative control method applied to multiple energy storage units Download PDFInfo
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- 238000004146 energy storage Methods 0.000 title claims abstract description 85
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000007665 sagging Methods 0.000 claims abstract description 9
- 230000008569 process Effects 0.000 claims description 10
- 238000012937 correction Methods 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 210000000352 storage cell Anatomy 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 238000004891 communication Methods 0.000 abstract description 2
- 230000003993 interaction Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 238000010248 power generation Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000006399 behavior Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
-
- 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
-
- 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
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
-
- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The invention relates to the technical field of micro-grid energy storage units, in particular to a SoC cooperative control method applied to multiple energy storage units, which comprises the following steps: carrying out charge state equalization on multiple energy storage units with the same battery capacity; step two: for multiple energy storage units with different battery capacities, the corresponding sagging coefficient needs to be resetk pf Then carrying out charge state equalization on the multiple energy storage units according to the adjustment mode in the first step; step three: modifying state of charge equalization coefficientsk SoCp So as to adjust the rate of the output active power of the energy storage unit and further adjust the rate of the state of charge balance. After the method is adopted, the information interaction of the large-scale multi-energy storage unit is realized by utilizing a dynamic consistency algorithm of sparse communication, the sagging coefficient is subjected to per unit according to the battery capacity, and a state of charge equalization item, a frequency and voltage deviation compensation item are added in sagging control, so that the state of charge equalization problem of the multi-energy storage unit of the micro-grid is solved.
Description
Technical Field
The invention relates to the technical field of micro-grid energy storage units, in particular to a system on a chip (SoC) cooperative control method applied to multiple energy storage units.
Background
In recent years, with the increasing exhaustion of traditional fossil energy and the increasing environmental crisis, a micro-grid system composed of renewable clean energy and an energy storage system is receiving more and more attention. The micro-grid is used as a novel grid structure and is often composed of photovoltaic and other distributed power generation units, distributed energy storage units, direct current and alternating current loads and the like. The storage battery, the lithium battery, the super capacitor and the like can be used as energy storage media of the distributed energy storage units, the storage battery type distributed energy storage units are often matched with the distributed power generation units for use due to the advantages of high energy density and the like, the distributed energy storage units in the micro-grid are often controlled by sagging to realize independent capacity expansion of interconnection lines and plug and play, but when rated capacity and initial value of the state of charge of each distributed energy storage unit are inconsistent, the state of charge balance problem can occur, the problems of voltage and frequency deviation and the like can be caused, and the running stability of the micro-grid system can be seriously influenced.
In the capacity expansion process of the multi-energy storage units of the micro-grid, the initial value of the state of charge and the capacity of the battery can be different due to different aging degrees of each distributed energy storage unit, and the problem of state of charge balance exists when the traditional droop control is applied, so that a new control method is required to be provided.
The Chinese patent No. 107069812A discloses a distributed cooperative control method for multiple energy storage units in a grid-connected micro-grid, which is used for coordinating the charge and discharge behaviors of the multiple energy storage units and inhibiting active power fluctuation at a public coupling point between the micro-grid and a power distribution network. Firstly, abstracting each energy storage unit into a second-order multi-agent system model; and then, designing a control algorithm of each energy storage unit by using a distributed coordination control method.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a SoC cooperative control method applied to multiple energy storage units.
In order to solve the technical problems, the invention relates to a SoC cooperative control method applied to a plurality of energy storage units, which comprises the following steps,
step one: carrying out charge state equalization on multiple energy storage units with the same battery capacity;
step two: sag coefficient k for multiple energy storage cells of different battery capacities, P-f pf Inversely related to the battery capacity of the energy storage unit, a corresponding sag factor k needs to be reset pf Then carrying out charge state equalization on the multiple energy storage units according to the adjustment mode in the first step;
step three: modifying the equilibrium coefficient k of state of charge SoCp To adjust the rate of the output active power of the energy storage unit and further adjust the speed of state of charge equalizationThe rate.
Preferably, said step one specifically comprises the steps of,
step S1: the working points of the energy storage units with different working voltages automatically move to reach a common new voltage value;
step S2: after the adjustment in the step S1, the output power is adjusted by continuously correcting the system frequency in the adjustment process, so that the energy storage unit with higher state of charge value discharges at the energy storage unit with lower initial state of charge, and the difference of the state of charge values of the energy storage units is gradually reduced;
step Sn: after multiple corrections to the system frequency, the active power output by the system is continuously adjusted, the output of the energy storage unit is gradually adjusted, the difference of the charge state values is gradually reduced to 0, and the energy storage unit operates under the same active power, frequency and charge state.
Preferably, the control principle expression of the method is specifically as follows:
wherein k is pf Represents the sagging coefficient of P-f; soC (System on chip) ave Representing a state of charge average of the energy storage unit; k (k) SoCp 、k SoCi An equalization coefficient representing a state of charge; c (C) f Representing a frequency compensation factor; c (C) v Representing the voltage compensation factor.
After the method is adopted, the information interaction of the large-scale multi-energy storage units is realized by utilizing a dynamic consistency algorithm of sparse communication, the sagging coefficient is subjected to per unit according to the battery capacity, a state-of-charge equalization item, a frequency and voltage deviation compensation item are added in sagging control, the multi-distributed energy storage units with different battery capacities and initial states of charge can reach state-of-charge equalization in the charging and discharging processes, and the voltage and the frequency have no obvious deviation in the working process, so that the problem of state-of-charge equalization of the multi-energy storage units of the micro-grid is solved.
Drawings
The invention will be described in further detail with reference to the drawings and the detailed description.
Fig. 1 is a control block diagram of a state of charge cooperative control technique of a multi-energy storage unit according to the present invention.
Fig. 2 is a schematic diagram of a movement curve of an operating point in the adjustment process in step S1 of the present invention.
Fig. 3 is a schematic diagram of a movement curve of an operating point in the adjustment process in step S2 of the present invention.
Detailed Description
As shown in fig. 1, the invention includes a SoC cooperative control method applied to multiple energy storage units, and the control principle expression is as follows:
wherein k is pf Represents the sagging coefficient of P-f; soC (System on chip) ave Representing a state of charge average of the energy storage unit; k (k) SoCp 、k SoCi An equalization coefficient representing a state of charge; c (C) f Representing a frequency compensation factor; c (C) v Representing the voltage compensation factor.
In particular comprising the following steps of the method,
step one: carrying out charge state equalization on multiple energy storage units with the same battery capacity; for multiple energy storage units with the same battery capacity, the state of charge balancing process is illustrated with two distributed energy storage units. Assume that the two energy storage units are outputting active power P ref In a stable working state, the initial charge states of the energy storage unit 1 and the energy storage unit 2 are different, and the SoC 1(n) >SoC 2(n) . Schematic diagrams of the adjustment process are shown in fig. 2 and 3.
The method specifically comprises the following steps:
step S1: in stage 1, the working points of the energy storage units with different working voltages automatically move to reach a common new voltage value. Since the working voltages of the two energy storage units are different, the working points of the two energy storage units can automatically move to reach a common new voltage value, and fig. 2 shows a first-time change motion curve of the working points.
Step S2: and 2, after the adjustment in the step S1, adjusting the output power by continuously correcting the system frequency in the adjustment process, so that the energy storage unit with higher charge state value discharges the energy storage unit with lower initial charge state at a higher speed, and the difference of the charge state values of the energy storage units is gradually reduced. After the adjustment in phase 1, the energy storage unit 1 and the energy storage unit 2 work at the point A2 and the point B2 respectively. Initial value SoC 1(n) >SoC 2(n) ，P 1(n) >P 2(n) Delta is then SoC1(n) >δ SoC2(n) . Delta during adjustment SoC The output active power is effectively regulated by continuously correcting the system frequency, so that the discharge speed of the energy storage unit 1 is faster than that of the energy storage unit 2, and the system comprises SoC 1 SoC (System on a chip) 2 The difference in the operating point becomes smaller and the movement curve of the operating point is shown in fig. 3.
Step Sn: after multiple corrections to the system frequency, the active power output by the system is continuously adjusted, the output of the energy storage unit is gradually adjusted, the difference of the charge state values is gradually reduced to 0, and the energy storage unit operates under the same active power, frequency and charge state. Through delta SoC Multiple corrections to the system frequency are carried out, the active power output by the system is continuously adjusted along with the correction, the output force of the two energy storage units is gradually adjusted, and the system is SoC 1 SoC (System on a chip) 2 The difference between the two energy storage units is gradually reduced to 0, and the two energy storage units operate under the same active power, frequency and charge state.
Step two: sag coefficient k for multiple energy storage cells of different battery capacities, P-f pf Inversely related to the battery capacity of the energy storage unit, a corresponding sag factor k needs to be reset pf And then carrying out charge state equalization on the multiple energy storage units according to the adjustment mode in the step one.
Step three: modifying the equilibrium coefficient k of state of charge SoCp So as to adjust the rate of the output active power of the energy storage unit and further adjust the rate of the state of charge balance. Modifying the equilibrium coefficient k of state of charge SoCp The rate of the output active power of the energy storage unit can be adjusted to adjust the rate of state of charge equalization, but it is worth noting that the equalization coefficient k of the state of charge SoCp When the vibration is too large, the vibration problem is brought to the system, and the stability of the system is affected, so k is SoCp The value of (2) is within a reasonable range.
While particular embodiments of the present invention have been described above, it will be appreciated by those skilled in the art that these are merely illustrative, and that many variations or modifications may be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined only by the appended claims.
Claims (2)
1. The SoC cooperative control method applied to the multiple energy storage units is characterized by comprising the following steps,
step one: carrying out charge state equalization on multiple energy storage units with the same battery capacity;
step two: sag coefficient k for multiple energy storage cells of different battery capacities, P-f pf Inversely related to the battery capacity of the energy storage unit, a corresponding sag factor k needs to be reset pf Then carrying out charge state equalization on the multiple energy storage units according to the adjustment mode in the first step;
step three: modifying the equilibrium coefficient k of state of charge SoCp The speed of the output active power of the energy storage unit is regulated, so that the speed of state of charge equalization is regulated;
the first step specifically comprises the following steps,
step S1: the working points of the energy storage units with different working voltages automatically move to reach a common new voltage value;
step S2: after the adjustment in the step S1, the output power is adjusted by continuously correcting the system frequency in the adjustment process, so that the discharging speed of the energy storage unit with higher state of charge value is higher than that of the energy storage unit with lower initial state of charge, and the difference of the state of charge values of the energy storage units is gradually reduced;
step Sn: after multiple corrections to the system frequency, the active power output by the system is continuously adjusted, the output of the energy storage unit is gradually adjusted, the difference of the charge state values is gradually reduced to 0, and the energy storage unit operates under the same active power, frequency and charge state.
2. The SoC cooperative control method applied to the multiple energy storage units according to claim 1, wherein the control principle expression of the method is as follows:
wherein k is pf Represents the sagging coefficient of P-f; soC (System on chip) ave Representing a state of charge average of the energy storage unit; k (k) SoCp 、k SoCi An equalization coefficient representing a state of charge; c (C) f Representing a frequency compensation factor; c (C) v Representing the voltage compensation factor.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102981123A (en) * | 2012-11-05 | 2013-03-20 | 浙江吉利汽车研究院有限公司杭州分公司 | Estimation system and estimation method of power battery surplus capacity |
| CN103560546A (en) * | 2013-11-11 | 2014-02-05 | 东南大学 | Method for improving droop control in energy storage charge state |
| CN107985302A (en) * | 2016-10-26 | 2018-05-04 | 丰田自动车株式会社 | Vehicle |
| CN110112723A (en) * | 2019-04-03 | 2019-08-09 | 上海电力学院 | A kind of droop control method under direct-current grid off-network state |
| CN110808599A (en) * | 2019-10-31 | 2020-02-18 | 上海电力大学 | Island direct-current micro-grid parallel multi-energy-storage charge state balance control method |
| CN112751332A (en) * | 2021-01-06 | 2021-05-04 | 曲阜师范大学 | Direct-current micro-grid energy storage system SOC balance control method based on droop control |
-
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- 2021-07-07 CN CN202110767600.0A patent/CN113507151B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102981123A (en) * | 2012-11-05 | 2013-03-20 | 浙江吉利汽车研究院有限公司杭州分公司 | Estimation system and estimation method of power battery surplus capacity |
| CN103560546A (en) * | 2013-11-11 | 2014-02-05 | 东南大学 | Method for improving droop control in energy storage charge state |
| CN107985302A (en) * | 2016-10-26 | 2018-05-04 | 丰田自动车株式会社 | Vehicle |
| CN110112723A (en) * | 2019-04-03 | 2019-08-09 | 上海电力学院 | A kind of droop control method under direct-current grid off-network state |
| CN110808599A (en) * | 2019-10-31 | 2020-02-18 | 上海电力大学 | Island direct-current micro-grid parallel multi-energy-storage charge state balance control method |
| CN112751332A (en) * | 2021-01-06 | 2021-05-04 | 曲阜师范大学 | Direct-current micro-grid energy storage system SOC balance control method based on droop control |
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Effective date of registration: 20240229 Address after: No. 299 Fuxing Road, Jintan District, Changzhou City, Jiangsu Province, 213200 Patentee after: CHANGZHOU RUIHUA POWER ELECTRONIC DEVICES CO.,LTD. Country or region after: China Address before: 213200 No. 8, industrial concentration zone, Shetou market town, Zhiqian Town, Jintan District, Changzhou City, Jiangsu Province Patentee before: CHANGZHOU RUIHUA POWER ELECTRONIC DEVICES Co.,Ltd. Country or region before: China |