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中频有源滤波器由于工作频率高,对注入电感的响应更加敏感,因此需要更准确的负载模型和注入电感的计算方法。通过将中频负载建模为典型整流式非线性负载,并且在考虑换向过程的情况下,对负载特性进行详细分析。在此基础上结合有源电力滤波器(active power filter,APF)模型,给出并联电压型中频有源滤波器注入电感值的准确计算公式。由分析结果可见,中频有源滤波器补偿性能与注入电感及其电阻、负载电流换相过程、非线性负载特性和系统频率等密切相关。最后通过Matlab建模仿真,验证该计算方法的正确性。
Due to the high operating frequency, the IF active filter is more sensitive to the injected inductor, so a more accurate model of the load and the method of calculating the injected inductor are needed. By modeling the IF load as a typical non-linear rectified load, the load characteristics are analyzed in detail, taking into account the commutation process. Based on this, an accurate calculation formula of the injected inductor value of the shunt voltage source IF filter is given by combining with the active power filter (APF) model. From the analysis results, it can be seen that the compensation performance of the IF active filter is closely related to the injected inductor and its resistance, the commutation process of the load current, the nonlinear load characteristic and the system frequency. Finally, Matlab simulation to verify the correctness of the calculation method.