电力电容器串联电抗器及其补偿容量的算法

由于电力电子元件、变频设备、非线性负荷的存在,变压器结构不对称或工艺等问题,导致出现谐波电压或者谐波电流,在无功功率补偿装置中,谐波对电力电容器的影响主要表现在增加电容器损耗、放大谐波电流、引起电容器过热和降低电容器寿命等方面。为减少或避免高次谐波对电容器的危害,应从电能质量和抑制谐波装置上采取措施。本文就低压并联电容器装置串联电抗器及补偿容量进行分析,结合额定参数及现场数据,推导出具体公式,通过公式可计算补偿单元的额定无功输出和实际无功输出容量,可作为补偿装置设计、实际工程应用的参考。

An algorithm of reactors connected in series by power capacitorsandcompensation capacity

Power electronic components, frequency converters and nonlinear loads as well as asym-metric transformer structure and technology result in harmonic voltage or harmonic current. In reactivepower compensation devices , harmonic affects power capacitors by increasing capacitor loss , harmoniccurrent and leading to capacitor overheat and reducing service life of capacitors. In order to reduce oravoid the harm of high-order harmonics to capacitors , measures should be taken on power quality andharmonic suppression devices. In this paper , series reactors of installation of low-voltage shunt capaci-tors and compensation capacity were analyzed, and a formula was derived on the basis of rated pa-rameters and field data. The rated reactive output capacity and actual reactive output capacity of the compensation unit were figured out as a reference for compensation device design and engineeringapplication.