供电系统谐波对电能计量影响的研究

Harmonic Affection on Electrical Energy Measurement

本文从电能计量理论出发,推导在存在谐波的系统中,线性负荷和非线性负荷的电能计量计算公式,指出现存电能计量方式的不合理性。然后,利用Matlab的Sim Power Syetems模块对电子式电能表计量的准确性进行了验证;在此基础上,对系统中存在非线性负荷的情况进行了仿真,由仿真结果可知,当系统中存在谐波功率时,线性用户实际消耗电能低于电能表的计量电能,非线性用户实际耗电能高于电能表的计量电能。提出了基于偏最小二乘法回归模型的非线性水平评估方法来进行电能计量,提高了非线性负荷下电能的计量精度。

Based on the electric energy measurement theory, the formula deduction of the electrical energy measurement under linear and non-linear load in the system which exist harmonics, and pointed out the irrationality of the existing electric energy metering. Then, the Sim Power Syetems module of Matlab was used to verify the accuracy of electronic energy measurement; based on this simulation method, the system exist non-linear load was simulated, the simulation results shows that when the power system contains harmonic, actual consumption of electrical energy for linear user is lower than the measurement of energy measuring electricity, and the actual electricity power consumption of non-linear users is higher than the measurement of electrical energy measurement, so more reasonable method for electric energy metering is needed in further study. Based on the partial least squares regression model, a assessment method about non-linear level was propose, which increase the measuring accuracy of energy measurement under non-linear load.