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通过对中性点引出式有源电力滤波器在三相四线制电路中的应用分析,结合其有效的数学模型,研究了一种新型的非正交坐标系的空间矢量脉宽调制方法,解决了传统的空间矢量脉宽调制需要耗费大量计算去判断扇区的问题,同时采用了预测补偿型电流检测方法进行谐波电流的获取,并在Matlab/Simulink环境下建立了以上调制方法和控制策略的中性点引出式三相四线制有源电力滤波器的仿真模型。经过仿真分析,结果验证了以上方案的有效性。
By analyzing the application of neutral point drawn active power filter in three-phase four-wire system and combining with its effective mathematical model, a new type of space vector pulse width modulation method for non-orthogonal coordinate system is studied. It solves the problem that the traditional space vector pulse width modulation needs a large amount of calculation to judge the sector, at the same time, the predictive compensation current detection method is adopted to acquire the harmonic current, and the above modulation method and control are established under the Matlab / Simulink environment Strategy of the neutral point of the three-phase four-wire active power filter simulation model. After simulation analysis, the results verify the effectiveness of the above scheme.