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A circuit structure and control method for vanadium battery charging and discharging

A vanadium battery, charge and discharge technology, which is applied in the direction of battery circuit devices, circuit devices, fuel cell additives, etc., can solve the problems of large volume and weight of power frequency transformers, large losses, and difficult charge and discharge efficiency of vanadium battery systems, etc., to achieve Improve work efficiency, optimize voltage, reduce power volume and weight

Active Publication Date: 2016-11-09
浙江清岭科技有限公司
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  • Description
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  • Application Information

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Problems solved by technology

However, the volume and weight per unit power of power frequency transformers are large, and the loss is also large, so it is not easy to improve the charge and discharge efficiency of the vanadium battery system

Method used

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  • A circuit structure and control method for vanadium battery charging and discharging
  • A circuit structure and control method for vanadium battery charging and discharging

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specific Embodiment approach

[0021]The specific implementation is as follows: For high-power and low-voltage DC systems, the interleaved parallel BuckBoost circuit not only reduces the requirements for the rated current value of each switch tube, but also increases the degree of control freedom, providing a topology basis for realizing steady-state and dynamic optimal control. In order to ensure that faults on the AC high-voltage side are not directly transmitted to the low-voltage DC vanadium battery side through the electrical connection line, the vanadium battery system needs to be isolated and connected to the grid. This function is realized by a high-frequency isolated full-bridge DC / DC circuit; Crystal material, and the working frequency is much higher than the power frequency transformer, so that the volume and weight of the system unit power can be reduced, and the working efficiency of the system can be improved. The three-phase full-bridge DC / AC circuit is a commonly used AC-DC conversion circuit...

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Abstract

The invention discloses a charge and discharge circuit structure for a vanadium battery and a control method thereof, which belong to the field of energy storage system control. The vanadium battery stack charging and discharging main circuit is connected in series by the power grid, the charger and the vanadium battery main stack, in which the charger is connected in series by the interleaved parallel BuckBoost circuit, high-frequency isolated full-bridge DC / DC, three-phase full-bridge DC / AC and the grid The electrolyte circulation control circuit is connected by the controller to the pump at the positive and negative ends of the vanadium battery, the pump is controlled to drive the electrolyte circulation, and the charge and discharge instructions are issued by the upper control software of the charger, and each component circuit of the charger works at the corresponding Under working conditions, the charging and discharging function of the vanadium battery stack is realized through voltage and current closed-loop control; the invention not only realizes the requirement of electrical isolation between the vanadium battery and the power grid, but also improves the working efficiency of the system, and realizes smooth charging and discharging under various charging and discharging states. switch to ensure the safety of vanadium batteries.

Description

technical field [0001] The invention belongs to the field of energy storage system control, in particular to a charging and discharging circuit structure for a vanadium battery and a control method thereof. Background technique [0002] Liquid flow battery is also called redox flow battery. The positive and negative active material electrolytes are stored independently. When charging and discharging, the electrolyte flows into the battery through a pump to carry out electrochemical reactions. Vanadium redox flow battery, referred to as vanadium battery, has the advantages of independent design of power and capacity, fast response, long life, and low maintenance cost, making it have extremely broad application prospects in wind power, photovoltaic power generation, power grid peak regulation and other fields. Since the vanadium battery energy storage system not only needs to control the charge and discharge of the battery stack, but also needs to supply power to the controlle...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/00H01M8/04
CPCH02J7/02H02J2207/20H02J7/04
Inventor 赵杨阳毕大强柴建云孙旭东
Owner 浙江清岭科技有限公司
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