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通过增加杆上变压器数量来扩大电网容量,会大大增加电网线路的改造成本。为此,采用由国家电网公司提供的充、换电站电动汽车电池和自行研制的能量转换装置(power conversion system,PCS)组成的储能系统,通过实验室模拟对低电压线路进行调压试验。试验结果表明:随着放电功率增大,可利用的电池容量减少;在放电功率为3 kW时,1个电池箱工作电压为69~80 V,5个电池箱串联可满足PCS直流侧电压在324~438 V的要求;在低电压时段通过电池储能系统放电给供电线路,可以有效提升线路电压。与增加杆上变压器扩容方法相比,电池储能调压装置具有安装简便、占地少、投资小、移动灵活、可重复利用等特点。
Expanding the capacity of the grid by increasing the number of transformers on the poles will greatly increase the cost of retrofitting grid lines. To this end, the energy storage system consisting of the battery charge and substation electric vehicles provided by State Grid Corporation and the power conversion system (PCS) developed by the State Grid Corporation was used to conduct the voltage regulation test on the low-voltage line through laboratory simulation. The experimental results show that with the increase of discharge power, the available battery capacity decreases. When the discharge power is 3 kW, the operating voltage of one battery box is 69 ~ 80 V, and the five battery boxes can be connected in series to meet the requirements of PCS DC side voltage 324 ~ 438 V requirements; in the low voltage period discharge through the battery energy storage system to the power supply line, you can effectively increase the line voltage. Compared with the method of increasing the expansion of the transformer on the pole, the battery energy-saving and pressure-regulating device has the advantages of simple installation, small occupation, small investment, flexible movement and reusability.