CN113113923A - Two-stage energy storage system main circuit for hybrid energy storage and power module thereof - Google Patents

Two-stage energy storage system main circuit for hybrid energy storage and power module thereof Download PDF

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Publication number
CN113113923A
CN113113923A CN202011553232.1A CN202011553232A CN113113923A CN 113113923 A CN113113923 A CN 113113923A CN 202011553232 A CN202011553232 A CN 202011553232A CN 113113923 A CN113113923 A CN 113113923A
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China
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energy storage
storage system
circuit
main circuit
power module
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Inventor
张文波
陈亚琳
雷建明
郑睿
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Nanjing Vocational University of Industry Technology NUIT
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Nanjing Vocational University of Industry Technology NUIT
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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
    • 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
    • H02J7/34—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering
    • H02J7/345—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering using capacitors as storage or buffering devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from AC input or output
    • H02M1/126—Arrangements for reducing harmonics from AC input or output using passive filters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
    • H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
    • H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • H02M3/1582—Buck-boost converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
    • H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
    • H02M7/12—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/217—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M7/219—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/66—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output with possibility of reversal
    • H02M7/68—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output with possibility of reversal by static converters
    • H02M7/72—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/79—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/797—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • 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
    • H02J2207/50—Charging of capacitors, supercapacitors, ultra-capacitors or double layer capacitors

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Inverter Devices (AREA)
  • Dc-Dc Converters (AREA)

Abstract

本发明公开一种用于混合储能的双级储能系统主电路及其功率模块，包括储能系统主电路和功率模块，所述储能系统主电路采用双级拓扑结构，前一级AC/DC为三相PWM整流电路，后一级双向DC/DC为Buck/Boost电路，涉及储能技术领域，功率模块采用一体化设计，有效降低了模块设计的复杂度，散热性能好、可靠性高、安装方便、结构紧凑，可根据不同功率需求，通过相同封装不同功率等级的IGBT模块，可满足不同功率等级要求；储能系统采用铅碳电池和超级电容相结合的混合储能方式，利用铅碳电池具有能量大，超级电容充放电瞬时速度快，使用寿命长、功率密度高，可以实现在并/离网模式下恒流恒压充放电以及平滑切换功能。

Figure 202011553232

The invention discloses a main circuit of a two-stage energy storage system for hybrid energy storage and a power module thereof, comprising a main circuit of an energy storage system and a power module. /DC is a three-phase PWM rectifier circuit, and the latter two-way DC/DC is a Buck/Boost circuit, which involves the field of energy storage technology. The power module adopts an integrated design, which effectively reduces the complexity of module design, and has good heat dissipation performance and reliability. High, convenient installation, compact structure, according to different power requirements, through the same package of IGBT modules with different power levels, can meet the requirements of different power levels; the energy storage system adopts a hybrid energy storage method combining lead-carbon batteries and super capacitors Lead-carbon batteries have large energy, fast supercapacitor charging and discharging instantaneous speed, long service life, high power density, and can realize constant current and constant voltage charging and discharging and smooth switching functions in parallel/off-grid mode.

Figure 202011553232

Description

Two-stage energy storage system main circuit for hybrid energy storage and power module thereof
Technical Field
The invention relates to the technical field of energy storage, in particular to a double-stage energy storage system main circuit for hybrid energy storage and a power module thereof.
Background
At present, with the gradual development of new energy power generation and micro-grid technology and the continuous expansion of peak-to-valley price difference of users, new problems are brought to the stable and safe operation of a power grid. The technology of lead-acid batteries with large capacity, super capacitor energy storage and the like is adopted, so that the problem of shortage of power supply and demand can be effectively solved, the quality of electric energy is improved, and the operation safety of a power grid is improved. The converter for the energy storage system is used as an important component of the energy storage system, and not only has a charge and discharge function, but also can meet the requirement of fast seamless switching of a grid-connected and off-grid dual mode.
The power module is an important component of the converter of the energy storage system, and as components are more and more stray, the arrangement space is limited, the arrangement needs to be concentrated, the requirement on heat dissipation is high, how to realize the heat dissipation of the power module and the miniaturization and modularization of the module assembly in the limited space, and the power module is an important component of the converter of the energy storage system and is a technical problem which is always concerned about and expected to be solved in the industry.
Disclosure of Invention
The invention aims to provide a two-stage energy storage system main circuit for hybrid energy storage and a power module thereof, wherein the power module adopts an integrated design, the complexity of module design is effectively reduced, the heat dissipation performance is good, the reliability is high, the installation is convenient, the structure is compact, and different power grade requirements can be met by packaging IGBT modules with different power grades in the same way according to different power requirements; the energy storage system adopts a mixed energy storage mode combining a lead-carbon battery and a super capacitor, and the lead-carbon battery has the advantages of high energy, high charging and discharging instantaneous speed of the super capacitor, long service life and high power density, and can realize constant-current and constant-voltage charging and discharging and smooth switching functions in an on-grid/off-grid mode.
A two-stage energy storage system main circuit for hybrid energy storage and a power module thereof comprise an energy storage system main circuit and a power module, wherein the energy storage system main circuit adopts a two-stage topological structure, the front-stage AC/DC is a three-phase PWM (pulse-width modulation) rectifying circuit, the rear-stage bidirectional DC/DC is a Buck/Boost circuit, the three-phase PWM rectifying circuit comprises a power grid side switch, an alternating current EMC (electro magnetic compatibility) filter, a pre-charging loop, an alternating current fuse, an LCL (inductor-capacitor) filter and a three-phase PWM rectifying module which are sequentially coupled, the Buck/Boost circuit comprises a Buck/Boost chopping module, and the output side of the Buck/Boost chopping module is filtered to a direct current breaker switch Q02 and a direct current contactor;
the power module comprises a three-phase PWM rectifier bridge IGBT module and a chopping IGBT module which are fixed on a radiator, all IGBT module units are installed on the air-cooled radiator through heat conduction silicone grease, the IGBT module units are connected through positive and negative terminals of a laminated direct-current bus bar, the positive and negative terminals of the laminated direct-current bus bar are also respectively connected with the positive and negative terminals of eight direct-current supporting capacitors, the output side of the three-phase PWM rectifier bridge IGBT module is connected with an alternating-current input side wiring copper bar, the output side of the chopping IGBT module is connected with a direct-current output side wiring copper bar, an alternating-current Hall is installed on the alternating-current input side wiring copper bar, and a direct-current Hall is installed on the direct-current output;
the main circuit of the energy storage system comprises a grid-connected operation mode and an off-grid operation mode,
when the main circuit of the energy storage system is in grid-connected operation: the voltage outer ring and the current inner ring are combined with voltage feedforward, the outer ring is regulated by adopting direct current voltage PI, so that a bus capacitor and output voltage are kept constant, a voltage value allowed by an energy storage medium is used as a voltage given value, direct current bus voltage directly measured by a measuring element is used as a voltage actual value, and after the direct current voltage outer ring is regulated and limited, the output quantity of the direct current voltage outer ring is used as a given value of active current of the current inner ring;
when a main circuit of the energy system runs off the grid: the amplitude and the frequency of output voltage are controlled by adopting constant voltage and constant frequency control, a set value of an energy storage system is used as a control set value, the magnitude of output current is changed according to the magnitude of a load, three-phase independent phase voltage is used as system outer ring control, then the three-phase independent phase voltage is adjusted by a PI adjuster to be changed into alternating current three-phase voltage, and then the alternating current three-phase voltage is compared with an instantaneous value of the alternating current three-phase voltage to generate a three-phase modulation.
Preferably, the pre-charging circuit comprises a pre-charging fuse, a pre-charging contactor and a pre-charging resistor, and the circuit is mainly used for pre-storing electric energy for the direct-current bus-bar capacitor.
Preferably, the output load of the energy storage system main circuit is an energy storage medium and is connected with the lead-carbon battery and the super capacitor.
Preferably, the LCL filter includes a three-phase ac reactor, a three-phase filter capacitor in a delta connection mode, and a three-phase ac reactor, and plays a role in filtering harmonic waves of the rectifier circuit.
Preferably, the copper heat pipe is embedded in the panel of the air-cooled radiator, an axial fan is installed at an air inlet at one end of the radiator, and the air-cooled radiator and the direct-current support capacitor are both installed on the installation plate.
Preferably, when the main circuit of the energy storage system operates in a grid-connected mode, the bidirectional DC/DC works in a Buck voltage reduction working condition, the control mode of the device is a constant-current voltage limiting mode, and when the energy storage converter operates in an off-grid discharge mode, the bidirectional DC/DC works in a Boost voltage state, and the device is controlled in a constant-voltage current limiting mode;
the constant-current voltage-limiting mode is characterized in that a direct current PI regulation mode is utilized, the charge-discharge current allowed by the energy storage medium is used as a current given value, and the charge-discharge current directly obtained through a measuring element is used as a current feedback value;
the constant voltage current-limiting mode is characterized in that a voltage PI regulation mode is utilized, the voltage value allowed by the energy storage medium is used as a voltage given value, and the voltage of the energy storage medium is directly measured through a measuring element and used as a voltage feedback value.
The invention has the advantages that: the power module adopts an integrated design, the complexity of the module design is effectively reduced, the heat dissipation performance is good, the reliability is high, the installation is convenient, the structure is compact, and the requirements of different power grades can be met by packaging IGBT modules with different power grades in the same way according to different power requirements; the energy storage system adopts a mixed energy storage mode combining a lead-carbon battery and a super capacitor, and the lead-carbon battery has the advantages of high energy, high charging and discharging instantaneous speed of the super capacitor, long service life and high power density, and can realize constant-current and constant-voltage charging and discharging and smooth switching functions in an on-grid/off-grid mode.
Drawings
FIG. 1 is a main circuit diagram of the energy storage system of the present invention;
FIG. 2 is a block diagram of an AC/DC grid-connected control strategy of the present invention;
FIG. 3 is a block diagram of the AC/DC off-grid control strategy of the present invention;
FIG. 4 is a block diagram of a bi-directional DC/DC control strategy of the present invention;
FIG. 5 is an overall block diagram of the power module of the present invention;
the three-phase PWM rectifier bridge IGBT module comprises a 1, a three-phase PWM rectifier bridge IGBT module and a 2, a chopper IGBT module; 3. the direct current bus-bar type heat sink comprises an alternating current input side wiring copper bar, 4, an air-cooled radiator, 5, a fixed mounting plate, 6, alternating current Hall, 7, a direct current Hall, 8, a direct current output side wiring copper bar, 9 and a laminated direct current bus-bar; 10. supporting the capacitor.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
As shown in fig. 1 to 5, a two-stage energy storage system main circuit for hybrid energy storage and a power module thereof comprise an energy storage system main circuit and a power module, wherein the energy storage system main circuit adopts a two-stage topological structure, a former-stage AC/DC is a three-phase PWM rectifier circuit, a latter-stage bidirectional DC/DC is a Buck/Boost circuit, the three-phase PWM rectifier circuit comprises a grid side switch, an alternating current EMC filter, a pre-charging loop, an alternating current fuse, an LCL filter and a three-phase PWM rectifier module which are coupled in sequence, the Buck/Boost circuit comprises a Buck/Boost chopper module, and an output side of the Buck/Boost chopper module is filtered to a direct current breaker switch Q02 and a direct current contactor KM3 through a direct current LC; the hybrid energy storage device is suitable for hybrid energy storage, and can realize constant-current and constant-voltage charge and discharge and smooth switching functions in an on-grid/off-grid mode; the back stage is a Buck/Boost loop, voltage fluctuation is small after direct current LC filtering, and stable direct current voltage can be output.
The power module comprises a three-phase PWM rectifier bridge IGBT module 1 and a chopping IGBT module 2 which are fixed on a radiator, all IGBT module units are installed on an air-cooled radiator 4 through heat conduction silicone grease, the IGBT module units are connected through positive and negative terminals of a laminated direct-current bus bar 9, the positive and negative terminals of the laminated direct-current bus bar 9 are also respectively connected with the positive and negative terminals of eight direct-current supporting capacitors 10, the output side of the three-phase PWM rectifier bridge IGBT module 1 is connected with an alternating-current input side wiring copper bar 3, the output side of the chopping IGBT module 2 is connected with a direct-current output side wiring copper bar 8, an alternating-current Hall 6 is installed on the alternating-current input side wiring copper bar 3, and a direct-current Hall 7 is installed on the direct-current; the heat dissipation mode has the advantages of high heat dissipation efficiency, good performance and high reliability
The main circuit of the energy storage system comprises a grid-connected operation mode and an off-grid operation mode and is characterized in that,
when the main circuit of the energy storage system is in grid-connected operation: the voltage outer ring and the current inner ring are combined with voltage feedforward, the outer ring is regulated by adopting direct current voltage PI, so that a bus capacitor and output voltage are kept constant, a voltage value allowed by an energy storage medium is used as a voltage given value, direct current bus voltage directly measured by a measuring element is used as a voltage actual value, and after the direct current voltage outer ring is regulated and limited, the output quantity of the direct current voltage outer ring is used as a given value of active current of the current inner ring;
when a main circuit of the energy system runs off the grid: the amplitude and the frequency of output voltage are controlled by adopting constant voltage and constant frequency control, a set value of an energy storage system is used as a control set value, the magnitude of output current is changed according to the magnitude of a load, three-phase independent phase voltage is used as system outer ring control, then the three-phase independent phase voltage is adjusted by a PI adjuster to be changed into alternating current three-phase voltage, and then the alternating current three-phase voltage is compared with an instantaneous value of the alternating current three-phase voltage to generate a three-phase modulation.
The pre-charging loop comprises a pre-charging fuse, a pre-charging contactor and a pre-charging resistor, and the pre-charging circuit is mainly used for pre-storing electric energy for the direct-current bus capacitor.
And the output load of the main circuit of the energy storage system is an energy storage medium and is connected with the lead-carbon battery and the super capacitor.
The LCL filter comprises a three-phase alternating current reactor, a triangular connection type three-phase filter capacitor and a three-phase alternating current reactor, and plays a role in filtering harmonic waves of the rectifying circuit.
The copper heat pipe is embedded in the panel of the air-cooled radiator 4, an axial fan is installed at an air inlet at one end of the radiator, and the air-cooled radiator 4 and the direct-current supporting capacitor 10 are both installed on the installation plate 5.
When the main circuit of the energy storage system operates in a grid-connected mode, the bidirectional DC/DC works in a Buck voltage reduction working condition, the control mode of the device is a constant-current voltage limiting mode, and when the energy storage converter operates in an off-grid discharge mode, the bidirectional DC/DC works in a Boost state, and the device is controlled in a constant-voltage current limiting mode;
the constant-current voltage-limiting mode is characterized in that a direct current PI regulation mode is utilized, the charge-discharge current allowed by the energy storage medium is used as a current given value, and the charge-discharge current directly obtained through a measuring element is used as a current feedback value;
the constant voltage current-limiting mode is characterized in that a voltage PI regulation mode is utilized, the voltage value allowed by the energy storage medium is used as a voltage given value, and the voltage of the energy storage medium is directly measured through a measuring element and used as a voltage feedback value.
The specific implementation mode and principle are as follows:
as shown in the main circuit diagram of the energy storage system shown in fig. 1, the grid side switch comprises an alternating current circuit breaker Q01 and an alternating current contactor KM1, the grid side switch enters a three-phase PWM rectification module through an alternating current EMC filter, a pre-charging loop, an alternating current fuse (F04-F06) and an LCL filter, the grid side switch is converted through a Buck/Boost chopping module, the output side is filtered to a direct current circuit breaker switch Q02 and a direct current contactor KM3 through direct current LC, an output load is an energy storage medium and is connected with a lead-carbon battery and a super capacitor, the LCL filter comprises a three-phase alternating current reactor L1, a triangular connection type three-phase filter capacitor C1, a three-phase alternating current reactor L2, an LCL 1, a three-phase filter C1 and a three-phase filter.
Fig. 2 is a block diagram of an AC/DC grid-connected control strategy of the present invention, that is, when the energy storage system is in grid-connected operation, a voltage outer loop and a current inner loop are combined with a voltage feedforward. The outer ring mainly keeps the bus capacitance and the output voltage constant, and adopts direct-current voltage PI regulation. The allowed voltage value of the energy storage medium is used as a given voltage value, and the direct current bus voltage directly measured by the measuring element is used as an actual voltage value. And after the direct-current voltage outer ring is regulated and limited, the output quantity of the direct-current voltage outer ring is used as the given value of the active current of the current inner ring.
Fig. 3 is a block diagram of an AC/DC off-grid control strategy of the present invention, that is, when the energy storage system is in off-grid operation, the energy storage converter serves as a main power source, and the function of the energy storage converter is to keep the voltage and frequency of the power grid inside the system stable and unchanged. In this state, the grid-side converter can be regarded as a voltage source, and the control strategy is to adopt constant voltage and constant frequency, namely V/F control, so as to control the amplitude and frequency of the output voltage. The set value of the energy storage system is used as a control set value, and the magnitude of the output current is changed according to the magnitude of the load. The three-phase independent phase voltage is used as the system outer ring control, then is adjusted by the PI adjuster, is changed into alternating three-phase voltage, and is compared with the instantaneous value of the alternating three-phase voltage to generate a three-phase modulation wave.
Fig. 4 is a block diagram of a bidirectional DC/DC control strategy of the present invention, that is, the charging and discharging current allowed by the energy storage medium is used as a current set value, and the charging and discharging current directly obtained by the measuring element is used as a current feedback value; constant voltage charging and discharging utilizes a voltage PI regulation mode, and aims to keep the voltage of an energy storage medium stable. The allowed voltage value of the energy storage medium is used as a given voltage value, and the voltage of the energy storage medium is directly measured through a measuring element and used as a voltage feedback value.
Based on the above, the power module adopts an integrated design, so that the complexity of the module design is effectively reduced, the heat dissipation performance is good, the reliability is high, the installation is convenient, the structure is compact, and the requirements of different power grades can be met by packaging IGBT modules with different power grades in the same way according to different power requirements; the energy storage system adopts a mixed energy storage mode combining a lead-carbon battery and a super capacitor, and the lead-carbon battery has the advantages of high energy, high charging and discharging instantaneous speed of the super capacitor, long service life and high power density, and can realize constant-current and constant-voltage charging and discharging and smooth switching functions in an on-grid/off-grid mode.
It will be appreciated by those skilled in the art that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiments disclosed above are therefore to be considered in all respects as illustrative and not restrictive. All changes which come within the scope of or equivalence to the invention are intended to be embraced therein.

Claims (5)

1.一种用于混合储能的双级储能系统主电路及其功率模块，其特征在于，包括储能系统主电路和功率模块，所述储能系统主电路采用双级拓扑结构，前一级AC/DC为三相PWM整流电路，后一级双向DC/DC为Buck/Boost电路，所述三相PWM整流电路包括依次耦合的电网侧开关、交流EMC滤波器、预充电回路、交流熔断器、LCL滤波器和三相PWM整流模块，所述Buck/Boost电路包括Buck/Boost斩波模块，所述Buck/Boost斩波模块输出侧经直流LC滤波到直流断路器开关Q02和直流接触器KM3；1. a dual-stage energy storage system main circuit for hybrid energy storage and a power module thereof, is characterized in that, comprises an energy storage system main circuit and a power module, and the energy storage system main circuit adopts a dual-stage topology structure, and the front The first-stage AC/DC is a three-phase PWM rectifier circuit, and the second-stage bidirectional DC/DC is a Buck/Boost circuit. The three-phase PWM rectifier circuit includes a grid-side switch, an AC EMC filter, a precharge circuit, an AC A fuse, an LCL filter and a three-phase PWM rectifier module, the Buck/Boost circuit includes a Buck/Boost chopper module, and the output side of the Buck/Boost chopper module is filtered by the DC LC to the DC circuit breaker switch Q02 and the DC contact device KM3; 所述功率模块包括固定在散热器上的三相PWM整流桥IGBT模块（1）和斩波IGBT模块（2），所有的IGBT模块单元都通过导热硅脂安装在风冷散热器（4）上，且IGBT模块单元通过层叠直流母排（9）的正、负极接线端子相连，所述层叠直流母排（9）正负极还分别与八个直流支撑电容（10）正负极相连接，所述三相PWM整流桥IGBT模块（1）的输出侧连接交流输入侧接线铜排（3），所述斩波IGBT模块（2）的输出侧连接直流输出侧接线铜排（8），所述交流输入侧接线铜排（3）上安装有交流电流霍尔（6），所述直流输出侧接线铜排（8）上安装有直流电流霍尔（7）。The power module includes a three-phase PWM rectifier bridge IGBT module (1) and a chopper IGBT module (2) fixed on the radiator, and all IGBT module units are mounted on the air-cooled radiator (4) through thermal grease , and the IGBT module units are connected through the positive and negative terminals of the stacked DC busbar (9), the positive and negative electrodes of the stacked DC busbar (9) are also connected to the positive and negative electrodes of the eight DC support capacitors (10) respectively, The output side of the three-phase PWM rectifier bridge IGBT module (1) is connected to the AC input side wiring copper bar (3), and the output side of the chopper IGBT module (2) is connected to the DC output side wiring copper bar (8), so An AC current Hall (6) is installed on the wiring copper bar (3) on the AC input side, and a DC current Hall (7) is installed on the wiring copper bar (8) on the DC output side. 2.根据权利要求1所述的一种用于混合储能的双级储能系统主电路及其功率模块，其特征在于：所述预充电回路包括预充电熔断器、预充电接触器和预充电电阻，该电路主要作用为直流母排电容预储电能。2 . The main circuit of a dual-stage energy storage system for hybrid energy storage and its power module according to claim 1 , wherein the precharge circuit comprises a precharge fuse, a precharge contactor and a precharge fuse. 3 . Charging resistor, the main function of this circuit is to pre-storage electric energy for the DC bus capacitor. 3.据权利要求1所述的一种用于混合储能的双级储能系统主电路及其功率模块，其特征在于：所述储能系统主电路的输出负载为储能介质，连接铅碳电池和超级电容。3. A dual-stage energy storage system main circuit for hybrid energy storage and power module thereof according to claim 1, characterized in that: the output load of the energy storage system main circuit is an energy storage medium, which is connected to lead Carbon batteries and supercapacitors. 4.据权利要求1所述的一种用于混合储能的双级储能系统主电路及其功率模块，其特征在于：所述LCL滤波器包括三相交流电抗器、三角形连接方式三相滤波电容和三相交流电抗器，起到将整流电路滤除谐波作用。4. The main circuit of a dual-stage energy storage system for hybrid energy storage and its power module according to claim 1, wherein the LCL filter comprises a three-phase AC reactor, a three-phase delta connection mode Filter capacitors and three-phase AC reactors play the role of filtering out harmonics in the rectifier circuit. 5.据权利要求1所述的一种用于混合储能的双级储能系统主电路及其功率模块，其特征在于：所述风冷散热器（4）的面板内部嵌入铜制热管，散热器一端进风口处安装有轴流风扇，所述风冷散热器（4）和直流支撑电容（10）都安装在安装板（5）上。5 . The main circuit of a dual-stage energy storage system for hybrid energy storage and its power module according to claim 1 , wherein a copper heat pipe is embedded in the panel of the air-cooled radiator ( 4 ). 6 . An axial flow fan is installed at the air inlet at one end of the radiator, and the air-cooled radiator (4) and the DC support capacitor (10) are both installed on the mounting plate (5).
CN202011553232.1A 2020-12-24 2020-12-24 Two-stage energy storage system main circuit for hybrid energy storage and power module thereof Pending CN113113923A (en)

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