中文摘要：

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。

英文摘要：

Based on αβ coordinate system, the variable-step adaptive algorithm is applied to detect the reactive current and harmonic current of non-linear loads. Using the amplitude of each harmonic current as weight of the adaptive iterative algorithm, the low-order harmonic currents’ impact on convergence value of step and weight factor can be basically eliminated, so as to guarantee the detection accuracy. The parameters of proportional resonance（PR） controller are designed based on the PI controller’s parameters. The reactive fundamental current and the low-order harmonics can be controlled to be zero-steady-error by the relevant PR controller respectively. The effectiveness of the proposed algorithm and design is validated by the simulation and experimental results.