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电力系统自动化中RTU得到了广泛的应用。在设计中,由于采用技术的差异,RTU的性能指标有较大差异。本文首先介绍RTU交流采样单元的基本要求,在此基础上分析了常规的几种交流采样算法的特点,并详细推导了该文提出的实现离散傅立叶变换DFT的一种快速算法——FFT算法实现过程;同时分析了在电路的有功功率和无功测量测量方法中,采用两表法测量三相电路的局限性。现场测试结果表明,该算法具有运算速度快,精度高等特点。
RTU in power system automation has been widely used. In the design, due to the use of technical differences, RTU performance indicators are quite different. This paper first introduces the basic requirements of AC sampling unit RTU, based on this analysis of the characteristics of several conventional AC sampling algorithm, and detailed derivation of the proposed discrete Fourier transform DFT to achieve a fast algorithm - FFT algorithm to achieve At the same time, the limitations of three-phase circuit using two-meter method are analyzed in the measurement of active power and reactive power in the circuit. The field test results show that the algorithm has the advantages of fast computing speed and high accuracy.