In this paper, a kind of on line monitoring method by the calculation of harmonic reactance to achieve the element parameters of single-tuning filter.Each harmonic impedance of the filter is obtained through Fourier decomposition of the filter voltage and current which is obtained by real time measurement, the real time parameters of each element of the filter is obtained with combination of structure calculation of the filter with purpose of on line monitoring of the element parameters of the filter.The method is simple to calculate and convenient to achieve without any modification of the existing filter.The function of voltage/current transformer at site is expanded and the detuning elements of the filter can be defined timely and accurately.The correctness and effectiveness of the proposed method is verified by the PSCAD simulation.%本文提出了一种通过计算谐波阻抗实现单调谐滤波器元件参数的在线监测方法,将实时测量得到的滤波器电压和电流通过傅里叶分解,进而求得滤波器的各次谐波阻抗,结合滤波器的结构计算得到该滤波器各元件的实时参数,实现滤波器元件参数在线监测的目的.该方法无需对现有滤波器进行任何改造、计算简单、实现方便.扩展了现场电压/电流互感器的功能,并可及时准确确定滤波器的失谐元件.通过PSCAD仿真验证了所提出方法的正确性和有效性.
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