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提出并实现了一种能在电网电压存在畸变和不对称条件下准确提取电网中谐波和无功电流的检测方法。从矢量分析角度出发,通过对三相电网电压和电流矢量在dq坐标系下进行投影变换,实现谐波和无功电流的提取。补偿电流采用预测电流控制,获得了较好的补偿特性和控制精度。对5 kVA有源滤波器和150 kVA混合滤波器的实验结果验证了所提出方法的可行性和正确性。
A new detection method that can accurately extract the harmonic and reactive current from the grid under the conditions of distortion and asymmetry of the grid voltage is proposed and implemented. From the point of view of vector analysis, harmonic and reactive current extraction is realized through the projection transformation of voltage and current vector of three-phase power grid in dq coordinate system. The compensation current is controlled by the predictive current, obtaining better compensation characteristics and control precision. Experimental results on a 5 kVA active filter and a 150 kVA hybrid filter validate the feasibility and correctness of the proposed method.