SOC equilibrium control method for H-bridge cascaded grid-connected energy storage system

• Main Authors: YU JINGRONG, CHEN BIN, ZHONG XIN, ZHENG WEIJIANG, WANG XIHENG, ZHOU RENYOU
• Format: Patent
• Language: Chinese; English
• Published: 23.10.2020
• Subjects: BASIC ELECTRIC ELEMENTS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; SYSTEMS FOR STORING ELECTRIC ENERGY

The invention discloses an SOC equilibrium control method for an H-bridge cascaded grid-connected energy storage system. The SOC equilibrium control method comprises the steps of: enabling N battery energy storage units to be correspondingly connected to N H-bridge inverters in the H-bridge cascaded grid-connected energy storage system, and enabling the N H-bridge inverters to be connected to an AC power grid after being cascaded; and realizing SOC equilibrium control for each H-bridge inverter based on a formula shown in description, wherein the (1+k*delta SOCi) is an allocation correction item, and k is an allocation correction coefficient. By adopting the SOC equilibrium control method for the H-bridge cascaded grid-connected energy storage system, a good SOC equilibrium effect is achieved, and a SOC equilibrium speed can be improved. 本发明公开了一种H桥级联型并网储能系统SOC均衡控制方法，H桥级联型并网储能系统中，N个电池储能单元对应连接至N个H桥逆变器，N个H桥逆变器级联后连接至交流电网；对每一个H桥逆变器均基于以下公式实现SOC均衡控制：其中(1+k·△SOCi)为分配修正项，k为分配修正系数。采用这种H桥级联型并网储能系统SOC均衡控制方法，具有良好的SOC均衡效果，