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目前非线性负荷在煤矿企业供电系统中的大量应用,使得电网电能质量下降,将产生很大的安全隐患。有源电力滤波器是补偿电力系统谐波及无功功率的重要装置,其谐波检测方法与控制的实时性和准确性是实现有效补偿的一个关键。介绍了基于双DSP的有源电力滤波器的工作原理,提出了应用于谐波电流检测的基于NUTTALL窗的三峰插值FFT算法,最后对整个有源滤波器系统进行了仿真与实验验证。Matlab仿真与实验结果表明:提出的算法能成功地应用于APF并对谐波有较好的抑制。
At present, a large number of applications of non-linear load in the power supply system of coal mines make the power quality of the power grid declining, which will create a great potential safety hazard. The active power filter is an important device to compensate harmonic and reactive power in the power system. The real-time and accuracy of the harmonic detection method and control are the keys to achieve effective compensation. The working principle of active power filter based on dual DSP is introduced, and a tri-peak interpolation FFT algorithm based on NUTTALL window applied to harmonic current detection is proposed. Finally, the whole active filter system is simulated and verified. Matlab simulation and experimental results show that the proposed algorithm can be successfully applied to APF and has better suppression of harmonics.