电动汽车电池用于电网低电压线路的储能调压试验

Voltage Regulation Test of Energy Storage System for Low-Voltage Power Line with Using Electric Vehicle Battery

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。

The capacity of power grid can be enlarged by means of increasing pole transformers,which will greatly increase the improvement cost of the line in power network.With regards to this reason,the voltage regulation tests for lowvoltage power line were carried out in the laboratory by means of the battery energy storage system consisting of electric vehicle battery in charge and replacement station provided by State Grid Corporation and self-made power conversion system（PCS）.The results show that the available battery capacity decreases with the increase of discharge power.The operating voltage of one battery box is in the range of 69-80 V at the discharge power of about 3 kW,therefore,five battery boxes in series can meet the needs of voltage range of 324438 V on PCS DC side.The voltage of power line can be effectively improved when the battery energy storage system affords power supply during low-voltage hours.Compared with the method of increasing pole transformers,the voltage regulation equipment containing battery energy storage has advantages of simple installation,small space requirement,small investment,flexible mobility and reusable.