低压无功补偿装置电容器额定电压选择和输出容量计算

Rated Voltage Selection and Output Power Capacity Calculation forLow Voltage Reactive Power Compensation Capacitor

针对低压无功补偿装置常采用并联电容器组串联电抗的技术方案,分析了串联电抗器和电压偏差对并联电容器运行电压的影响,以电容器额定电压应与运行电压一致最佳为原则来选择电容器的额定电压。分析了电抗率、电压偏差和电容器的额定电压对无功补偿装置输出无功容量的影响,计算了常见工况下无功补偿装置的运行输出容量与额定容量的比值,可应用于电容器额定容量的快速选择。

This paper focuses on the low voltage reactive power compensation devices which are normally consisted of series connected capacitors and reactors.The impact of reactors and voltage deviation on operating voltage of shunt capacitors is analyzed,and the rated voltage is selected to be consistent with the operating voltage.The effect of reactance rate,voltage deviation and capacitor’s rated voltage on output reactive capacity from reactive power compensation devices is analyzed,and the ratio between real output under normal working condition and rated value is computed.This can provide an efficient guidance for determining the rated power capacity of capacitors.