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非线性负载的变化是影响有源电力滤波器(APF)稳定控制的主要因素之一,基于无源性的控制(PBC)方法为此提供了有效的解决方案。利用本质上是非线性反馈的PBC策略,从能量角度分析并联型APF控制系统,确定不必抵消的“无功力”,设计全局定义的控制律,实现APF系统的全局稳定和电流跟踪控制。首先建立了三相APF的Euler-Lagrange模型；在此基础上利用PBC方法构建电流动态跟踪控制器,在非线性负载时变未知情形下,实现了直流侧电容电压的补偿控制和谐波电流的期望轨迹渐近跟踪；最后,针对实际运行时APF系统参数具有不确定性的问题,将PBC方法与非线性观测算法相结合,实现电阻参数的自调整,有效抑制负载变化时产生的电流畸变。该方法具有形式简单、无奇异点、鲁棒性好的特点。基于dSPACE的实验结果证明了该控制策略的有效性。
The change of nonlinear load is one of the main factors that affect the stability control of Active Power Filter (APF). The Passive Control (PBC) method provides an effective solution to this problem. By using PBC strategy, which is essentially nonlinear feedback, the parallel APF control system is analyzed from the energy point of view to determine the “reactive power” that does not need to be offset. The globally defined control law is designed to achieve the global stability and current tracking control of the APF system. Firstly, the Euler-Lagrange model of three-phase APF was established. Based on this, the current dynamic tracking controller was constructed by PBC method. Under the condition of nonlinear load time-varying unknown, the compensation control of DC capacitor voltage and harmonic current The trajectory of asymptotic trajectory is expected to be asymptotically tracked. Finally, aiming at the uncertainties of APF system parameters in actual operation, the PBC method is combined with the nonlinear observation algorithm to realize the self-adjusting of the resistance parameters and effectively suppress the current distortion generated when the load changes. The method has the characteristics of simple form, no singularity and good robustness. The experimental results based on dSPACE prove the effectiveness of this control strategy.