不平衡电流无功补偿方法研究

Reactive power compensation for unbalanced current

在对三相四线制系统几种特殊情况分析的基础上,应用叠加原理,采用星形和三角形两种接线方式组合,得出一般三相不平衡负载平衡化无功补偿公式,可消除不对称负荷产生的负序和零序电流分量,保持系统对称。该公式既适合于三相三线制系统,也适合于三相四线制系统。仿真结果表明,该补偿方法对于不同接线方式的不平衡负荷都具有较好的补偿效果,证明了理论推导的正确性。

Several special conditions of three-phase four-wire system are analyzed. According to the superposition theorem and applying both star- connection and delta- connection,a set of reactive power compensation formula for general three- phase unbalanced load is brought forward to eliminate the negative and zero sequence current components caused by unbalanced load for system balance. It is suitable for both three-phase three-wire system and three-phase four-wire system. The simulative results show the compensation effectiveness on the unbalanced load with different connection,which verifies the correctness of theoretical deduction.