基于王氏定理的台区三相不平衡补偿与应用

Three-phase Unbalanced Compensation in Transformation Region and Its Application Based on Wang's Theorem

现有无源元件负荷补偿方法能够从理论层面上有效解决三相不平衡问题,但由于采用瞬时值作为计算参数,难以适应实际配电网负荷波动大、变化迅速的特点,平衡效果不佳。因此,采用有功功率这一本身具有平均值意义的物理量作为计算参数,对王氏定理的有功功率转移规律进行定量分析,从而推导出以有功功率平衡为目标的相间补偿电纳计算公式,再进一步考虑实际线路阻抗、电源不对称等工程因素,对基础公式进行修正,并最终总结出较为完善的针对工程应用的台区三相不平衡补偿配置方法,仿真结果表明按该方法配置能够有效提高无源元件补偿在配电网中的适应性。

Current passive component load compensation method can effectively solve the problem of three-phase unbalance in theoretical level, but it is hard to adapt to characteristics of large load fluctuation and rapid variation of the actual power distribution network by using instantaneous values as calculating parameters, which means poor balance effect. Therefore, this paper takes the physical quantity of active power which has the meaning of average value as calculating parameter and makes quantitative analysis on the law of active power transfer of Wang＇s theorem so as to derive a computational formula for phase-to-phase compensated susceptance aiming at active power balance. Furthermore, it considers engineering factors such as actual line impedance, asymmetric power supply, and so on, makes correction for the basic formula and finally summarizes a relatively complete configuration method for three-phase unbalanced compensation in transformer region aiming at engineering application. The simulation result indicates the configuration of this method can effectively improve adaptability of passive component compensation in the power distribution network.