电力系统配电网中一般有较多的波动性或冲击性电动机负载，造成电压偏低、波动严重，严重影响电能质量和电机的运行性能。针对这一问题，提出采用串联电容就近对电动机进行补偿的方法，计及电机的负载特性，通过对比计算确定了在配电变压器高压侧进行串补对机端电压调节的效果最好。仿真计算了波动性负荷情况下串补装置不同补偿方式对电机机端电压调节性能的影响。结果表明：采用低度过补偿方式，可以在避免自激的情况下，在较大的范围内提升线路末端电机的电压性能，消除由于波动性负荷引起的电压波动，为配电网中改善电动机的运行性能和机端电压质量提供了一条新的思路。%Voltage becomes a little lower and fluctuates seriously caused by fluctuating or impact motor loads in distribution network of power system, which influences the quality of electric energy and the operation performance of motors. A method of using series capacitors to compensate motors nearby is proposed to solve that problem. Considering the load characteristics of the motors, it concludes that regulating performance of voltage at the motor terminals is most effective when series capacitors are on the high voltage side of distribution transformer by comparing and calculating. It simulates and calculates the effects of voltage regulating performance at the motor terminals caused by series compensation device in different compensation modes. The results show that it can improve the voltage performance of motors at the ends of the line with a wide range and eliminate the voltage fluctuation caused by fluctuating loads on the condition that self-excitation is avoided when the capacitors are light over-compensated mode. It provides a new idea to improve the operation performance of motors and the quality of voltage at the motor terminals in distribution network.
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