交流功率测量相位偏移补偿的研究

Study of the Phase Deviation Compensation on AC Power Measurement

相位偏差是影响功率测量精度的重要因素。本文以三相交流在线测试仪为模型,分析了电压取样电路、电流取样电路、滤波电路和频率测量误差对相位偏差的影响,提出了选取电流与相位偏差曲线拐点作为相位偏差校准点的分段线性化校正方法。同时,本文还介绍了在系统存在相位偏差的条件下,利用同步交流采样原理计算有功功率和无功功率的方法和补偿步骤。实践表明,在本文算法基础上研制的功率测量系统的有功功率和无功功率测量误差均小于0.05%。

Phase deviation is an important factor for the accuracy of power measurement. In this paper, based on the model of three-phase AC online tester, the voltage sampling circuit, current sampling circuit, filter circuit and fre- quency measurement error to the influence of th~ phase deviation are analyzed and a segment linearization correction method for the calibration points phase deviation is presented by choosing the turning points of the curve of current and phase deviation. Under the conditions of the system exiting phase deviation, the compensation method and steps to calculate the active power and reactive power using synchronous AC sampling theory are also introduced. Experiments show that the measurement errors both active power and reactive power of the power measurement system based on the algorithm proposed in this paper are less than 0.05 %.