Intermediate frequency（400 Hz）harmonic detection and reactive compensation device

ZHENG Xu， ZHANG You-bing， ZHOU Wen-wei， YANG Guang-hao，FENG Liang， WANG Xin-cheng
（College of Information Engineering， Zhejiang University of Technology， Hangzhou 310023， China）

Abstract： It is very difficult to achieve synchronous sampling and integrated-cycle truncation when intermediate frequency power system harmonics were analyzed. Therefore there inevitably exists the spectral leakage and fence effect. In addition，intermediate frequency power system has higher requirements on the accuracy and sensitivity of reactive power compensation control. Aiming at the problems of harmonic pollution and the lack of active power output in intermediate frequency power system，fast Fourier transform（FFT）algorithm and dynamic reactive power compensation technology were applied to harmonic detection and reactive compensation device of intermediate frequency power system. The Hanning window interpolation FFT and nine-region dynamic reactive power compensation control strategy was put forward. Finally，the whole operation debugging platform was set up to test the reactive power compensation and harmonic detection modules of intermediate frequency power system. The simulation results on Matlab indicate that Hanning window interpolation FFT can greatly reduce the error of asynchronous sampling. The research results indicate that the measurement accuracy of the harmonic content of the equipment meets the requirements and reactive power compensation control strategy is feasible and effective.
Key words： intermediate power system； harmonic pollution； harmonic detection； Hanning window； double-spectrum-line interpolation；reactive power compensation