CN212659999U - Capacitor pre-charging circuit for submodule of cascaded multi-level battery energy storage system - Google Patents
Capacitor pre-charging circuit for submodule of cascaded multi-level battery energy storage system Download PDFInfo
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- CN212659999U CN212659999U CN202021342249.8U CN202021342249U CN212659999U CN 212659999 U CN212659999 U CN 212659999U CN 202021342249 U CN202021342249 U CN 202021342249U CN 212659999 U CN212659999 U CN 212659999U
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Abstract
The utility model provides a cascade multilevel battery energy storage system submodule capacitor pre-charging circuit, which comprises a power supply, a capacitor branch circuit, a power conversion module and a controller circuit module, wherein the positive pole of the power supply is connected with the positive pole ends of the capacitor branch circuit, the power conversion module and the controller circuit module, and the negative pole of the power supply is connected with the negative pole ends of the capacitor branch circuit, the power conversion module and the controller circuit module; the capacitor branch circuit comprises a capacitor C, a sampling module and a semiconductor device T, wherein the sampling module and the semiconductor device T are connected with the capacitor C in parallel, one end of the capacitor C is connected with the anode of a power supply, the other end of the capacitor C is connected with one end of the semiconductor device T, and the other end of the semiconductor device T is connected with the cathode of the power supply. The utility model discloses only charge to electric capacity with a semiconductor device, when realizing that electric capacity charges in advance and electric capacity discharge circuit excision function, simplified electric capacity and charged in advance and electric capacity excision circuit topological structure, reduced the system hardware cost, improved system work efficiency.
Description
Technical Field
The utility model relates to an electric field, concretely relates to cascade multilevel battery energy storage system submodule piece electric capacity is charging circuit in advance.
Background
In the cascade multilevel battery energy storage system, the submodule specifically comprises a submodule battery pack, a parallel capacitor and a power conversion unit, wherein the parallel capacitor mainly has the function of absorbing ripple current in the charging process and the discharging process of the battery, so that the current flowing into or out of the battery is direct current, and the damage of the ripple current to the battery is reduced. However, if the difference between the capacitor voltage and the battery voltage is large, when the switch is turned off, a large instantaneous impact current is generated, which is easy to cause irreversible damage to the capacitor, the switch and the battery. Meanwhile, when the system stops working, the capacitor and the battery form a discharge loop, the battery pack can continuously discharge through the capacitor, and the system efficiency is seriously influenced, so that a switch needs to be added between the battery pack and the capacitor, so that the capacitor discharge loop is cut off when the system stops working, and the system efficiency is improved.
In the prior art, the submodule capacitor pre-charging circuit has the problems of complex structure, high requirement on switch device type selection, isolation required for driving, more circuit devices and the like, and is high in cost, difficult to control and low in charging efficiency.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems that a submodule capacitor pre-charging circuit is complex in structure, high in requirements on switch device type selection, high in driving requirements, multiple in circuit devices and the like in the prior art, the capacitor pre-charging circuit suitable for the submodule of the cascaded multi-level battery energy storage system is required to be provided, the circuit structure and the control method are simplified, and the pre-charging efficiency is improved.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a cascaded multi-level battery energy storage system submodule capacitor pre-charging circuit comprises a power supply, a capacitor branch circuit, a power conversion module and a controller circuit module, wherein the positive electrode of the power supply is connected with the input ends of the capacitor branch circuit, the power conversion module and the controller circuit module, and the negative electrode of the power supply is connected with the output ends of the capacitor branch circuit, the power conversion module and the controller circuit module; the capacitor branch circuit comprises a capacitor C, a sampling module and a semiconductor device T, wherein the sampling module and the semiconductor device T are connected with the capacitor C in parallel, one end of the capacitor C is connected with the anode of a power supply, the other end of the capacitor C is connected with one end of the semiconductor device T, and the other end of the semiconductor device T is connected with the cathode of the power supply.
Further, the power conversion module includes a power conversion unit having one end connected to one end of the capacitor C and the other end connected to the other end of the semiconductor device T.
Furthermore, the controller circuit module comprises a Buck module and a control module connected with the Buck module, wherein the input end of the Buck module is connected with the positive electrode of the power supply, and the other end of the Buck module is connected with the negative electrode of the power supply and is used for sampling capacitor voltage and transmitting a driving signal to the semiconductor device T.
The utility model discloses only charge to electric capacity with a semiconductor device, when realizing that electric capacity charges in advance and electric capacity discharge circuit excision function, simplified electric capacity and charged in advance and electric capacity excision circuit topological structure, reduced the system hardware cost, improved system work efficiency.
Drawings
FIG. 1 is a schematic diagram of the circuit connection of the present invention;
FIG. 2 is a schematic flow chart illustrating the control of the precharge principle according to the present invention;
in the figure: 1. a capacitor branch circuit; 11. a voltage sampling module; 2. a power conversion module; 21. a power conversion unit; 3. a controller circuit module; 31. a Buck module; 32. and a control module.
Detailed Description
A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.
The capacitor pre-charging circuit of the submodule of the cascaded multilevel battery energy storage system shown in fig. 1 comprises a power supply, a capacitor branch 1, a power conversion module 2 and a controller circuit module 3, wherein the positive pole of the power supply is connected with the input ends of the capacitor branch, the power conversion module and the controller circuit module, and the negative pole of the power supply is connected with the output ends of the capacitor branch, the power conversion module and the controller circuit module; the capacitor branch circuit comprises a capacitor C, a sampling module 11 connected with the capacitor C in parallel and a semiconductor device T, one end of the capacitor C is connected with the anode of a power supply, the other end of the capacitor C is connected with one end of the semiconductor device T, and the other end of the semiconductor device T is connected with the cathode of the power supply.
In the preferred embodiment, only one power semiconductor device is connected in series to the capacitor charging circuit, such as a MOSFET, an IGBT and the like, and no additional device, peripheral circuit or isolation arrangement is needed, so that the circuit structure is simplified, the cost, the volume and the loss of the energy storage system are greatly reduced, and the working efficiency of the system is effectively improved.
After the system work, the current branch road mainly has threely, including mains power current i1, electric capacity branch road current i2 and power conversion module current i3, i3 is i1 and i2 current sum, and current i1, i3 are far greater than i2, so the utility model discloses will semiconductor device T sets up on electric capacity branch road, can avoid the system when normally working, and heavy current directly flows through semiconductor device T among the battery system charge-discharge engineering, and i2 is ripple current, and is relatively less, and the loss of production is less, and system efficiency is relatively higher, and semiconductor device T can reduce the requirement when the lectotype simultaneously, also is of benefit to reduce cost.
The power conversion module 2 according to the present preferred embodiment includes a power conversion unit 21 having one end connected to one end of the capacitor C and the other end connected to the other end of the semiconductor device T; the controller circuit module comprises a Buck module 31 and a control module 32 connected with the Buck module, the input end of the Buck module is connected with the positive electrode of the power supply, the other end of the Buck module is connected with the negative electrode of the power supply, the control module is used for sampling capacitor voltage and transmitting a driving signal to the semiconductor device T, power supply of the control module is obtained after the voltage of a battery pack of a submodule is reduced through the Buck circuit, the Buck circuit can be isolated, and the power ground of the control module and the negative electrode of the battery are equal in potential; in addition, in specific use, the output end of the semiconductor device T is connected with the cathode of the power supply, so that the driving level signal transmitted by the control module can be grounded with the power supply, and isolation processing is not needed, thereby effectively reducing the cost and the volume of system hardware.
The Buck module 31 according to the preferred embodiment is a non-isolated dc converter with an output voltage less than an input voltage, and has good reliability and high working efficiency.
Specifically, as shown in fig. 2, the control method of the capacitor pre-charging circuit for the submodule of the cascaded multilevel battery energy storage system is as follows:
presetting a difference value delta U between the capacitor voltage and the power supply voltage;
the control module collects capacitor voltage through the sampling module and compares the capacitor voltage with power supply voltage;
if the difference value between the capacitor voltage and the power supply voltage is larger than delta U, a high-frequency driving signal is sent to the semiconductor device T through the control module, and the capacitor is precharged;
if the difference value of the capacitor voltage and the power supply voltage is smaller than delta U or after the capacitor is precharged, the semiconductor device is kept closed, and the system can work normally;
and after the system stops working, a disconnection driving signal is sent to the semiconductor device T through the control module, the semiconductor device is disconnected, and a capacitance discharge loop is cut off.
The specific steps of the capacitor pre-charging in the preferred embodiment are as follows: firstly, setting the voltage of capacitor pre-charge, and sampling the capacitor voltage in real time; then, a pulse type high-frequency driving level signal is sent to the semiconductor device through the control module; the high-frequency driving frequency, the conduction duty ratio and the stray reactance of the semiconductor T are set to control the size of the charging current, the semiconductor device is chopped continuously for a plurality of switching periods, and when the voltage sampling value of the capacitor reaches the preset voltage value, the high-frequency driving level signal is stopped being sent.
The capacitor pre-charging according to the preferred embodiment can be realized by the following steps: firstly, setting the voltage of capacitor pre-charge, and sampling the capacitor voltage in real time; then sending a normally-closed signal to the semiconductor device through the control module; setting the driving voltage of the semiconductor device T to enable the semiconductor T to be in a non-complete conduction state, and limiting the current by utilizing the self impedance of the semiconductor T in the non-complete conduction state; when the voltage sampling value of the capacitor reaches a preset voltage value, a control module sends a normally-off signal to cut off a capacitor discharge loop to finish charging.
The above-mentioned embodiments are only to describe the preferred embodiments of the present invention, but not to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art without departing from the design spirit of the present invention should fall into the protection scope defined by the claims of the present invention.
Claims (3)
1. The capacitor pre-charging circuit for the submodule of the cascaded multilevel battery energy storage system is characterized by comprising a power supply, a capacitor branch (1), a power conversion module (2) and a controller circuit module (3), wherein the positive pole of the power supply is connected with the input ends of the capacitor branch, the power conversion module and the controller circuit module, and the negative pole of the power supply is connected with the output ends of the capacitor branch, the power conversion module and the controller circuit module; the capacitor branch circuit comprises a capacitor C, a sampling module (11) connected with the capacitor C in parallel and a semiconductor device T, one end of the capacitor C is connected with the anode of a power supply, the other end of the capacitor C is connected with one end of the semiconductor device T, and the other end of the semiconductor device T is connected with the cathode of the power supply.
2. A cascaded multilevel battery energy storage system submodule capacitor pre-charge circuit according to claim 1, characterized in that the power conversion module (2) comprises a power conversion unit (21) having one end connected to one end of the capacitor C and the other end connected to the other end of the semiconductor device T.
3. The cascaded multilevel battery energy storage system submodule capacitor pre-charging circuit according to claim 1, wherein the controller circuit module (3) comprises a Buck module (31) and a control module (32) connected with the Buck module, an input end of the Buck module is connected with a positive pole of the power supply, the other end of the Buck module is connected with a negative pole of the power supply, and the control module is used for sampling capacitor voltage and transmitting a driving signal to the semiconductor device T.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021342249.8U CN212659999U (en) | 2020-07-08 | 2020-07-08 | Capacitor pre-charging circuit for submodule of cascaded multi-level battery energy storage system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021342249.8U CN212659999U (en) | 2020-07-08 | 2020-07-08 | Capacitor pre-charging circuit for submodule of cascaded multi-level battery energy storage system |
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| Publication Number | Publication Date |
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| CN212659999U true CN212659999U (en) | 2021-03-05 |
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| CN202021342249.8U Active CN212659999U (en) | 2020-07-08 | 2020-07-08 | Capacitor pre-charging circuit for submodule of cascaded multi-level battery energy storage system |
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| CN (1) | CN212659999U (en) |
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