CN113178912A - Retired power battery charging and discharging system for energy storage power station and control method of retired power battery charging and discharging system - Google Patents
Retired power battery charging and discharging system for energy storage power station and control method of retired power battery charging and discharging system Download PDFInfo
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- CN113178912A CN113178912A CN202110466476.4A CN202110466476A CN113178912A CN 113178912 A CN113178912 A CN 113178912A CN 202110466476 A CN202110466476 A CN 202110466476A CN 113178912 A CN113178912 A CN 113178912A
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- 238000007599 discharging Methods 0.000 title claims abstract description 37
- 238000004146 energy storage Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 8
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 58
- 238000004804 winding Methods 0.000 claims abstract description 26
- 238000012545 processing Methods 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 238000002955 isolation Methods 0.000 abstract description 5
- 230000002238 attenuated effect Effects 0.000 description 2
- 238000011217 control strategy Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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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
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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
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
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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
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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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
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a retired power battery charging and discharging system for an energy storage power station and a control method of the retired power battery charging and discharging system. The primary side of the high-frequency transformer is provided with a plurality of windings, the secondary side of the high-frequency transformer is provided with a winding, one end of each of the plurality of bidirectional high-frequency DC/AC converters is connected with the retired power battery, and the other end of each of the plurality of bidirectional high-frequency DC/AC converters is connected with the primary side of the high-frequency transformer; one end of the bidirectional high-frequency AC/DC converter is connected with the secondary side of the high-frequency transformer, the other end of the bidirectional high-frequency AC/DC converter is connected with a direct-current bus of the energy storage power station, and the branch controller controls each bidirectional high-frequency DC/AC converter according to a charging and discharging instruction of the energy storage power station, so that a retired power battery charging and discharging system is formed. The invention can realize the electrical isolation among the retired power batteries and the electrical isolation between the retired power batteries and the direct current bus, thereby ensuring the reliability of the system.
Description
Technical Field
The invention relates to the technical field of energy storage power stations, in particular to a retired power battery charging and discharging system for an energy storage power station and a control method of the retired power battery charging and discharging system.
Background
In recent years, the conservation quantity of new energy automobiles in China is greatly increased year by year. Each new energy automobile is provided with a power battery to provide electric energy for the running of the automobile. However, the capacity of the power battery is attenuated continuously during repeated charging and discharging, and when the available capacity is attenuated to about 80%, the power battery needs to be retired from the new energy automobile. These retired power batteries simply do not meet the standards for electric vehicles, but are still very valuable energy storage resources. The retired power battery is used for an energy storage power station, can help a power grid to adjust power load, can reduce the construction cost of the energy storage power station, and has important significance for saving resources, protecting the environment, improving the utilization value of the full life cycle of the power battery and the like. However, the retired power batteries are generally sourced from electric vehicles of different models, so that the models of the retired power batteries are generally different, and even if the models are the same, parameters such as the working voltage, the internal resistance, the residual capacity and the residual service life of the batteries are different due to different service conditions before the batteries are retired. In an energy storage power station, the situation that different retired power batteries are charged and discharged simultaneously is easy to occur, however, the structure of the existing retired power battery charging and discharging system is unreasonable, different retired power batteries are easy to interfere with each other during working, loop current is formed, and due to the fact that the service lives and the performances of the retired power batteries are not uniform, the situation that one or more retired power batteries are damaged due to faults easily occurs, at the moment, the damaged batteries easily influence normal power batteries or other loads on a direct current bus, and the reliability of the system is low.
Disclosure of Invention
The first purpose of the present invention is to overcome the disadvantages and shortcomings of the prior art, and to provide a retired power battery charging and discharging system for an energy storage power station, wherein each retired power battery is configured with an independent controller and an independent converter, so that retired power batteries of different types can work in the system at the same time, and do not interfere with each other; by adopting the high-frequency transformer with a plurality of primary side coil windings, the electrical isolation between each retired power battery and a direct-current bus can be realized, and the reliability of the system is ensured.
The second purpose of the invention is to provide a control method for a retired power battery charging and discharging system of an energy storage power station.
The first purpose of the invention is realized by the following technical scheme: the retired power battery charging and discharging system for the energy storage power station comprises a plurality of battery charging and discharging modules, a high-frequency transformer, a bidirectional high-frequency AC/DC converter with a controller and a master controller; the primary side of the high-frequency transformer is provided with a plurality of coil windings which are isolated from each other, the secondary side of the high-frequency transformer is provided with one coil winding, and a plurality of battery charging and discharging modules are respectively connected with the plurality of coil windings on the primary side of the high-frequency transformer, namely one battery charging and discharging module is connected with one coil winding; an alternating current port of the bidirectional high-frequency AC/DC converter is connected with a coil winding on the secondary side of the high-frequency transformer, and a direct current port of the bidirectional high-frequency AC/DC converter is connected with a direct current bus of the energy storage power station; the battery charging and discharging module comprises a decommissioned power battery, a bidirectional high-frequency DC/AC converter, a sub-controller, a voltage sampler and a current sampler, wherein a direct current port of the bidirectional high-frequency DC/AC converter is connected with the decommissioned power battery, an alternating current port of the bidirectional high-frequency DC/AC converter is connected with a corresponding coil winding on the primary side of the high-frequency transformer, one end of the voltage sampler is connected with the decommissioned power battery port, the other end of the voltage sampler is connected with the sub-controller, one end of the current sampler is connected with the decommissioned power battery port, and the other end of the current sampler; the master controller and each branch controller can be in signal communication, and each branch controller controls the respectively connected bidirectional high-frequency DC/AC converter.
Further, the bidirectional high-frequency AC/DC converter and the bidirectional high-frequency DC/AC converter are both composed of power electronic switching converters.
Further, the sub-controller comprises a signal processing circuit and a driving circuit, wherein the signal processing circuit is used for processing the sampling signal and outputting a control signal, and the driving circuit is used for amplifying the control signal so as to drive the bidirectional high-frequency DC/AC converter to work.
The second purpose of the invention is realized by the following technical scheme: the control method for the retired power battery charging and discharging system of the energy storage power station comprises the following specific steps:
firstly, each sub-controller controls the energy transmission direction of a bidirectional high-frequency DC/AC converter connected with each sub-controller according to the retired power battery voltage sampled by a voltage sampler and the charge-discharge requirement of an energy storage power station; when the retired power battery needs to be charged, the controller controls the bidirectional high-frequency AC/DC converter to work in an inversion mode to drive the secondary side of the high-frequency transformer so as to transmit electric energy to the primary side of the high-frequency transformer, and meanwhile, the sub-controller controls the bidirectional high-frequency DC/AC converter to work in a rectification mode to convert the electric energy received by the primary side of the high-frequency transformer into direct current to charge the retired power battery; when the retired power battery needs to discharge to the direct-current bus, the sub-controller controls the bidirectional high-frequency DC/AC converter to work in an inversion mode to drive the primary side of the high-frequency transformer, so that electric energy is transmitted to the secondary side of the high-frequency transformer, meanwhile, the controller controls the bidirectional high-frequency AC/DC converter to work in a rectification mode, the electric energy received by the secondary side of the high-frequency transformer is converted into direct current to be transmitted to the direct-current bus, and the sub-controller outputs signals to control the duty ratio of a power electronic switch in the bidirectional high-frequency DC/AC converter according to the voltage and the current of the battery sampled by the voltage sampler and the current sampler, the charge-discharge power required by the energy storage power station and the parameters of each retired power battery, so that the control of the power is realized.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the retired power batteries with different types and different parameters can work in the system at the same time and cannot interfere with each other.
2. The reliability of the system is ensured by realizing the electrical isolation among the retired power batteries and the electrical isolation between the retired power batteries and the direct-current bus.
Drawings
Fig. 1 is a schematic structural diagram of a retired power battery charging and discharging system according to an embodiment.
Fig. 2 is a schematic connection diagram of the retired power battery charging and discharging system and the power grid in the embodiment.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited thereto.
The invention provides a retired power battery charging and discharging system for an energy storage power station, which has the basic principle that a high-frequency transformer with a primary side provided with a plurality of coil windings isolated from each other and a secondary side provided with a coil winding and a plurality of bidirectional high-frequency AC/DC converters are appropriately combined and connected, so that retired power batteries of different types and different parameters can reliably work at the same time.
As shown in fig. 1, the retired power battery charging and discharging system for an energy storage power station disclosed in this embodiment includes a plurality of battery charging and discharging modules, a high-frequency transformer, a bidirectional high-frequency AC/DC converter with a controller, and a master controller; the primary side of the high-frequency transformer is provided with a plurality of coil windings which are isolated from each other, the secondary side of the high-frequency transformer is provided with one coil winding, and a plurality of battery charging and discharging modules are respectively connected with the plurality of coil windings on the primary side of the high-frequency transformer, namely one battery charging and discharging module is connected with one coil winding; an alternating current port of the bidirectional high-frequency AC/DC converter is connected with a coil winding on the secondary side of the high-frequency transformer, and a direct current port of the bidirectional high-frequency AC/DC converter is connected with a direct current bus of the energy storage power station; the battery charging and discharging module comprises a decommissioned power battery, a bidirectional high-frequency DC/AC converter, a sub-controller, a voltage sampler and a current sampler, wherein a direct current port of the bidirectional high-frequency DC/AC converter is connected with the decommissioned power battery, an alternating current port of the bidirectional high-frequency DC/AC converter is connected with a corresponding coil winding on the primary side of the high-frequency transformer, one end of the voltage sampler is connected with the decommissioned power battery port, the other end of the voltage sampler is connected with the sub-controller, one end of the current sampler is connected with the decommissioned power battery port, and the other end of the current sampler is connected with the sub-controller; the master controller and each branch controller can be in signal communication, and each branch controller controls the respectively connected bidirectional high-frequency DC/AC converter.
The bidirectional high-frequency AC/DC converter and the bidirectional high-frequency DC/AC converter are both composed of power electronic switch converters. The sub-controller comprises a signal processing circuit and a driving circuit, wherein the signal processing circuit is used for processing a sampling signal and outputting a control signal, and the driving circuit is used for amplifying the control signal so as to drive the bidirectional high-frequency DC/AC converter to work.
The design steps of the retired power battery charging and discharging system for the energy storage power station are as follows:
firstly, designing a required high-frequency transformer according to the number of the retired power batteries required to be configured. When the number of the retired power batteries to be configured is N, a high-frequency transformer with N coil windings on the primary side and one coil winding on the secondary side is needed, and the turn ratio of the coil windings on the primary side and the secondary side is comprehensively determined by the working voltage range of the retired power batteries, the direct-current bus voltage of an energy storage power station and the voltage transformation ratio of a bidirectional high-frequency DC/AC converter;
secondly, selecting a topological structure of the high-frequency converter and parameters thereof, wherein the topological structure of the high-frequency converter needs to meet the condition of allowing bidirectional transmission of electric energy;
thirdly, designing a voltage sampler and a current sampler according to the working voltage and current ranges of the retired power battery; and meanwhile, the sub-controllers are designed to output corresponding signals to control respective bidirectional high-frequency DC/AC converters according to a system charge-discharge control strategy.
Finally, the retired power battery charging and discharging system for the energy storage power station is connected to a power grid through a direct current bus and a bidirectional converter, as shown in fig. 2.
The specific control strategy of the present embodiment is as follows: the charging voltage threshold value of each retired power battery is respectively set to be Uc1、Uc2、…UCn. When the energy storage power station needs to discharge to the power grid, the master controller sends out the discharge instruction of the retired power battery and the discharge power P allowed by each retired power battery to each slave controllero1、Po2、…PoNEach sub-controller judges whether the corresponding retired power battery can be discharged or not according to whether the sampled battery voltage is larger than a voltage threshold or not, if the battery voltage is larger than the voltage threshold, the bidirectional high-frequency AC/DC converter is controlled to work in a rectification mode, the corresponding bidirectional high-frequency DC/AC converter works in an inversion mode, the on-off duty ratio of the bidirectional high-frequency DC/AC converter is controlled according to the allowed discharge power, the battery voltage and the current, and each sub-controller samples the battery voltage value at any time in the discharging process, when the battery voltage is larger than the voltage threshold, the battery voltage value is sampledAnd if the voltage is lower than the voltage threshold value, closing the corresponding bidirectional high-frequency DC/AC converter.
When the energy storage power station does not need to discharge to a power grid, each sub-controller samples a battery voltage value, when the battery voltage is lower than a voltage threshold value, the corresponding sub-controller sends a charging request to the main controller, if the energy storage power station allows the direct current bus to charge the battery at the moment, the main controller sends a charging instruction to the requested sub-controller, the sub-controllers control the high-frequency AC/DC converter to work in an inversion mode, and the corresponding bidirectional high-frequency DC/AC converter to work in a rectification mode to charge the required battery, and control the on-off duty ratio of the bidirectional high-frequency DC/AC converter according to the allowed charging power, the battery voltage and the current.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (4)
1. A retired power battery charge-discharge system for energy storage power station, its characterized in that: the system comprises a plurality of battery charge-discharge modules, a high-frequency transformer, a bidirectional high-frequency AC/DC converter with a controller and a master controller; the primary side of the high-frequency transformer is provided with a plurality of coil windings which are isolated from each other, the secondary side of the high-frequency transformer is provided with one coil winding, and a plurality of battery charging and discharging modules are respectively connected with the plurality of coil windings on the primary side of the high-frequency transformer, namely one battery charging and discharging module is connected with one coil winding; an alternating current port of the bidirectional high-frequency AC/DC converter is connected with a coil winding on the secondary side of the high-frequency transformer, and a direct current port of the bidirectional high-frequency AC/DC converter is connected with a direct current bus of the energy storage power station; the battery charging and discharging module comprises a decommissioned power battery, a bidirectional high-frequency DC/AC converter, a sub-controller, a voltage sampler and a current sampler, wherein a direct current port of the bidirectional high-frequency DC/AC converter is connected with the decommissioned power battery, an alternating current port of the bidirectional high-frequency DC/AC converter is connected with a corresponding coil winding on the primary side of the high-frequency transformer, one end of the voltage sampler is connected with the decommissioned power battery port, the other end of the voltage sampler is connected with the sub-controller, one end of the current sampler is connected with the decommissioned power battery port, and the other end of the current sampler is connected with the sub-controller; the master controller and each branch controller can be in signal communication, and each branch controller controls the respectively connected bidirectional high-frequency DC/AC converter.
2. The ex-service power battery charging and discharging system for energy storage power stations according to claim 1, characterized in that: the bidirectional high-frequency AC/DC converter and the bidirectional high-frequency DC/AC converter are both composed of power electronic switch converters.
3. The ex-service power battery charging and discharging system for energy storage power stations according to claim 1, characterized in that: the sub-controller comprises a signal processing circuit and a driving circuit, wherein the signal processing circuit is used for processing a sampling signal and outputting a control signal, and the driving circuit is used for amplifying the control signal so as to drive the bidirectional high-frequency DC/AC converter to work.
4. A control method for a retired power battery charging and discharging system of an energy storage plant according to any of claims 1-3, characterized in that: firstly, each sub-controller controls the energy transmission direction of a bidirectional high-frequency DC/AC converter connected with each sub-controller according to the retired power battery voltage sampled by a voltage sampler and the charge-discharge requirement of an energy storage power station; when the retired power battery needs to be charged, the controller controls the bidirectional high-frequency AC/DC converter to work in an inversion mode to drive the secondary side of the high-frequency transformer so as to transmit electric energy to the primary side of the high-frequency transformer, and meanwhile, the sub-controller controls the bidirectional high-frequency DC/AC converter to work in a rectification mode to convert the electric energy received by the primary side of the high-frequency transformer into direct current to charge the retired power battery; when the retired power battery needs to discharge to the direct-current bus, the sub-controller controls the bidirectional high-frequency DC/AC converter to work in an inversion mode to drive the primary side of the high-frequency transformer, so that electric energy is transmitted to the secondary side of the high-frequency transformer, meanwhile, the controller controls the bidirectional high-frequency AC/DC converter to work in a rectification mode, the electric energy received by the secondary side of the high-frequency transformer is converted into direct current to be transmitted to the direct-current bus, and the sub-controller outputs signals to control the duty ratio of a power electronic switch in the bidirectional high-frequency DC/AC converter according to the voltage and the current of the battery sampled by the voltage sampler and the current sampler, the charge-discharge power required by the energy storage power station and the parameters of each retired power battery, so that the control of the power is realized.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110466476.4A CN113178912A (en) | 2021-04-28 | 2021-04-28 | Retired power battery charging and discharging system for energy storage power station and control method of retired power battery charging and discharging system |
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| CN202110466476.4A CN113178912A (en) | 2021-04-28 | 2021-04-28 | Retired power battery charging and discharging system for energy storage power station and control method of retired power battery charging and discharging system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113794218A (en) * | 2021-10-13 | 2021-12-14 | 王勇 | Electric motor car decommissioning battery reutilization system based on buck-boost circuit |
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2021
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| CN108199603A (en) * | 2018-01-09 | 2018-06-22 | 青岛大学 | Flyback DC chopped-wave type single-stage multi input inverter is isolated in Multiple coil time sharing power supply |
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