三相不对称负荷功率测量误差校正方案

摘要

为提高功率测量的精度,针对三相负荷不对称时,三表法测量三相四线制电路有功功率存在测量误差的问题,提出从检测负荷虚拟中性点电压出发,将三相不对称负荷电路转化为三个单相电路,按照单相电路功率计量方法来计量各独立相负荷功率的方案。%In the case of the three-phase asymmetric load,the three-ammeter method in the measurement of the active power of the three-phase and four-wire circuit will cause the measurement error.In order to improve the accuracy of the power measurement,this essay suggests starting with the detection of the virtual neutral-point voltage,changing the three-asymmetric load circuit into three one-phase circuits,and measuring the load power of each phase by using the method used in power measurement of the single-phase circuit.