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基于αβ坐标系,应用变步长自适应滤波算法对非线性负载的无功电流及谐波电流进行检测。通过将各低次谐波幅值也作为权值加入至自适应迭代算法中,有效地消除了低次谐波对步长收敛值及权值收敛值的影响,保证了检测算法的稳态精度。基于PI控制器设计了比例谐振控制器的参数,将谐波检测算法获得的各次谐波指令分别通过相应的比例谐振控制器进行控制,即可实现对基波无功及25次以下各次谐波的无静差跟踪。仿真及实验结果验证了该算法及设计的有效性。
Based on the αβ coordinate system, a variable step adaptive filtering algorithm is applied to detect reactive current and harmonic current of nonlinear load. By adding each low-order harmonic amplitude to the adaptive iterative algorithm, the effect of lower-order harmonics on the convergence value of the step size and the weight value is effectively eliminated, and the steady-state accuracy of the detection algorithm is guaranteed . Based on the PI controller, the parameters of the proportional-resonance controller are designed. The orders of harmonics obtained by the harmonic detection algorithm are respectively controlled by the corresponding proportional-resonance controller, so that the reactive power of the fundamental wave and the order of 25 times Harmonic no-static tracking. Simulation and experimental results verify the effectiveness of the proposed algorithm and design.