考虑线路阻抗情况下的三相四线制不平衡系统无源补偿方法  

Passive Compensation Method for Three-phase-four-wire Unbalanced System Considering Line Impedance

作　　者：沈俊言 陶顺[1] SHEN Junyan;TAO Shun(North China Electric Power University,Beijing 102206,China)

机构地区：[1]华北电力大学,北京102206

出　　处：《电力电容器与无功补偿》2023年第2期25-31,共7页Power Capacitor & Reactive Power Compensation

基　　金：国家自然科学基金面上项目(51777066)。

摘　　要：目前针对三相不平衡系统的无源补偿方法大多都是忽略了电源电压不平衡及线路阻抗的影响。为此,推导了考虑线路阻抗影响,在电源电压及负载不对称的情况下,由电源对地电压、公共连接点对地电压及电流确定的三相四线制不对称系统无源补偿网络参数的方法。由该方法计算所得的补偿网络参数理论上可使待补偿系统的电流不平衡度及非有功功率降低至0,且满足补偿网络容量最小的优化目标。由于中性线阻抗在实际系统中难以精确测量,分析了忽略中性线阻抗在该方法计算过程中的合理性。仿真结果表明,该方法所设计的补偿网络是有效的,并且在忽略中性线阻抗的情况下,该方法也有一定的工程实用性。The present passive compensation methods for three-phase unbalanced system mostly ignores the influence of power supply voltage imbalance and line impedance.Therefore,the method of passive compensation network parameter of three-phase four wire asymmetrical system,which is defined by the voltage of power supply to ground and the voltage and current of common connection point to ground with consideration of the influence of line impedance and also in the case of asymmetrical condition of power supply voltage and load,is derived.The parameters of the compensation network calculated by this method can theoretically make the current imbalance and non active power of the system to be compensated to be down to 0,and also meet the optimization objective of minimizing the capacity of the compensation network.Since it is difficult to accurately measure the neutral line impedance in the actual system,the rationality of ignoring the neutral line impedance in the calculation process is analyzed.The simulation results show that the compensation network designed by this method is effective and the method,in case of ignoring the neutral line impedance,also has certain engineering practicability.

关 键 词：三相四线制 不对称系统 无源补偿 

分 类 号：TM714.3[电气工程—电力系统及自动化]