CN211089173U - Energy storage battery SOC equalizing system based on energy storage converter - Google Patents
Energy storage battery SOC equalizing system based on energy storage converter Download PDFInfo
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- CN211089173U CN211089173U CN201922146142.XU CN201922146142U CN211089173U CN 211089173 U CN211089173 U CN 211089173U CN 201922146142 U CN201922146142 U CN 201922146142U CN 211089173 U CN211089173 U CN 211089173U
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Abstract
Energy storage battery SOC balanced system based on energy storage converter belongs to the battery energy storage field for solve the long-time loss of system capacity that current balanced mode leads to, the system loss is big, control is complicated and constitutes complicated problem, the main points are three-phase AC power supply system's neutral point output electric wire netting neutral line, the midpoint output battery series connection midpoint line of two series batteries, electric wire netting neutral line and battery series connection midpoint line pass through balanced component and are connected, and the effect is that the topology is simple, reliable, and is with low costs, easily realizes.
Description
Technical Field
The utility model belongs to battery energy storage field relates to an energy storage battery SOC balanced system based on energy storage converter.
Background
The battery energy storage system SOC equilibrium problem, current solution mainly includes:
manual correction: the battery with the unbalanced SOC is cut off from the energy storage system, and the battery is independently charged or discharged by using special equipment to adjust the SOC value of the battery. However, manual calibration is time-consuming and labor-consuming, and cannot be adjusted online, resulting in long-term loss of energy storage system capacity.
Two-stage: the energy conversion system consists of a DC/DC converter and an energy storage converter. Each battery passes through a first-stage DC/DC conversion device, the output ends of the DC/DC conversion devices are connected in series or in parallel and then are converged into a direct current bus, and then the direct current bus is connected with an energy storage converter. The DC/DC conversion device adopts centralized control, when the SOC of a certain battery is unbalanced, the DC/DC conversion device adjusts the output power according to a control strategy, namely the SOC value can be adjusted, and the purpose of SOC balance is achieved. However, the two-stage power conversion system has two main defects, namely, the system loss is increased, and the system efficiency is reduced; and secondly, the system cost is increased because the power of the added primary DC/DC conversion device is the full power of the corresponding battery subsystem, the cost is high, and the loss is not negligible.
Multistage tandem applications: the system is mainly used for an H-bridge type high-voltage energy storage converter, each battery is connected with a primary H-bridge, the output power of each H-bridge is realized by adjusting the modulation wave of each H-bridge, and the purpose of adjusting the SOC of each battery is finally achieved. However, the H-bridge cascaded energy storage converter has a complex structure and high requirements on battery insulation performance, each stage needs a relatively independent controller, the control logic of the whole machine is complex, the H-bridge cascaded energy storage converter is mainly used for a high-voltage system, and the structure of the H-bridge cascaded energy storage converter determines that a battery subsystem corresponding to a part of H-bridges needs to bear high voltage to the ground, so that difficulty is brought to battery manufacturing.
Adopting an independent SOC balancing device: a device with an energy transfer function is arranged between two batteries connected in series and used for transferring energy between the two batteries, so that the SOC balance of the batteries is realized. However, the system-independent SOC balancing apparatus: the system nodes are increased, the structure is complex, and the cost is increased.
SUMMERY OF THE UTILITY MODEL
In order to solve the long-time loss of system capacity that current balanced mode leads to, system loss is big, control is complicated and constitute complicated problem, the utility model provides a following technical scheme: the energy storage battery SOC balance system based on the energy storage converter comprises energy storage batteries, the energy storage converter, a three-phase alternating current power supply system and balance elements, wherein the battery system is composed of the two energy storage batteries which are connected in series, the positive electrode of the battery system is connected with the positive electrode of the energy storage converter, the negative electrode of the battery system is connected with the negative electrode of the energy storage converter, the three-phase alternating current output of the energy storage converter is connected with the three-phase alternating current power supply system through a power grid phase line, a neutral point of the three-phase alternating current power supply system outputs a power grid neutral line, the middle points of the two batteries which are connected in series output a battery series middle point line, and.
Further, the equalization element comprises one or more devices including an inductive, resistive, protective or switching device.
Has the advantages that: the utility model discloses a SOC balanced mode, the topology is simple, reliable, and is with low costs, easily realizes, constitutes simply. The SOC balance control is simpler, the alternating current output voltage of the energy storage converter can be adjusted, and the long-time loss of system capacity and the control complexity can not be caused. The SOC balance function is integrated in the energy storage converter, so that a new energy storage converter can be formed. By utilizing the self devices of the converter, an additional electric energy conversion device is not needed, and the system balancing efficiency is high.
Drawings
Fig. 1 is a block diagram of the configuration of an equalization system.
Detailed Description
Example 1: as shown in fig. 1, an energy storage battery SOC equalization system based on an energy storage converter includes an energy storage battery, an energy storage converter, a three-phase ac power supply system and an equalization element, and a battery system composed of two energy storage batteries connected in series, where the positive electrode of the battery system is connected with the positive electrode of the energy storage converter, the negative electrode of the battery system is connected with the negative electrode of the energy storage converter, the three-phase ac output of the energy storage converter is connected with the three-phase ac power supply system through a grid phase line, a neutral point of the three-phase ac power supply system outputs a grid neutral line, the midpoint of the two batteries connected in series outputs a battery series midpoint line, and the grid neutral line is connected with the battery. Further, the equalization element comprises one or more devices including an inductive, resistive, protective or switching device.
The SOC balance control method of the balance system comprises the following steps: an equalization path is established between the alternating current output of the energy storage converter and the batteries, and the alternating current output voltage of the energy storage converter is adjusted to generate pulsating direct current in the equalization path consisting of a neutral point of a three-phase alternating current power supply system, the middle point of two energy storage batteries connected in series and an equalization element, wherein the pulsating direct current is used as the equalization current, so that an extra power difference value is generated between the two batteries connected in series, and the SOC equalization between the two batteries is realized. The magnitude of the equalizing current is adjusted to control the magnitude of the difference value of the extra power between the two batteries connected in series, the direction of the equalizing current is changed to change the positive and negative of the difference value of the extra power, the difference value of the power forms the difference value of the SOC of the batteries through time accumulation, and the energy storage converter adjusts the magnitude and the direction of the equalizing current according to the magnitude of the SOC values of the two batteries connected in series to realize the SOC equalization between the two batteries connected in series.
Example 2: an energy storage battery SOC balancing method based on an energy storage converter is characterized in that the positive pole and the negative pole of two batteries connected in series are respectively connected with the positive pole and the negative pole of the energy storage converter, the three-phase alternating current output of the energy storage converter is connected with a three-phase power supply system, and the middle point of the battery is connected with the neutral point of the power supply system through a balancing element (balancing path), as shown in figure 1. The equalization elements comprise one or more devices such as inductive, resistive, protective or switching devices, etc.
SOC balance control strategy of the energy storage converter: the control strategy aims to generate pulsating direct current, namely balance current in a balance path by adjusting alternating current output voltage of a converter, and the current enables extra power difference (different from the power difference generated by the two batteries due to different voltages) to be generated between the two batteries connected in series, so that SOC balance between the two batteries can be realized.
The utility model discloses the rationale of realization lies in: an equalizing path is established between the alternating current output of the energy storage converter and the battery by utilizing a neutral point of the power supply system, and the energy storage converter can change the magnitude and the direction of equalizing current in the equalizing path through a control strategy algorithm. The magnitude of the extra power difference between the two batteries can be controlled by adjusting the magnitude of the balance current, the positive and negative of the extra power difference can be changed by changing the direction of the balance current, and the power difference is an energy difference through time accumulation, namely the difference of the SOC of the batteries. Therefore, the energy storage converter can realize the SOC balance between the two batteries by adjusting the magnitude and the direction of the balance current according to the magnitude of the SOC values of the two batteries.
The above description is only for the purpose of creating a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution and the inventive concept of the present invention within the technical scope of the present invention.
Claims (2)
1. The energy storage battery SOC balance system based on the energy storage converter is characterized by comprising energy storage batteries, the energy storage converter, a three-phase alternating current power supply system and balance elements, wherein the battery system is composed of the two energy storage batteries which are connected in series, the positive pole of the battery system is connected with the positive pole of the energy storage converter, the negative pole of the battery system is connected with the negative pole of the energy storage converter, the three-phase alternating current output of the energy storage converter is connected with the three-phase alternating current power supply system through a power grid phase line, a neutral point of the three-phase alternating current power supply system outputs a power grid neutral line, the middle point of the two batteries which are connected in series outputs a battery series middle point line, and the.
2. The energy storage converter-based energy storage battery SOC equalization system of claim 1, wherein the equalization component comprises one or more devices, said devices comprising inductive, resistive, protective or switching devices.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922146142.XU CN211089173U (en) | 2019-12-04 | 2019-12-04 | Energy storage battery SOC equalizing system based on energy storage converter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117791825A (en) * | 2024-02-26 | 2024-03-29 | 合肥安赛思半导体有限公司 | UPS lithium battery charging loop and control method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117791825A (en) * | 2024-02-26 | 2024-03-29 | 合肥安赛思半导体有限公司 | UPS lithium battery charging loop and control method thereof |
| CN117791825B (en) * | 2024-02-26 | 2024-05-17 | 合肥安赛思半导体有限公司 | UPS lithium battery charging loop and control method thereof |
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