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LCL有源电力滤波器系统稳态误差和稳定性受到电网参数(频率、阻抗)摄动的影响。该文提出一种新的控制方法。包括两个部分,使用传统广义积分器时,电网频率漂移会使其对各次谐波处的积分增益大幅减小,从而增大系统的稳态误差,对此提出一种基于参数在线调整的新型广义积分器;此外为了抑制系统中LCL滤波器谐振,需要加入无源或有源阻尼。电网阻抗在较大范围内变化,会使阻尼作用减弱甚至引起系统不稳定,为此提出基于滑模控制的新型有源阻尼方法。仿真和实验结果证明,新的控制方法使系统对电网参数具有良好的鲁棒性。
The steady state error and stability of the LCL active power filter system are affected by the perturbation of the grid parameters (frequency, impedance). This paper proposes a new control method. It includes two parts. When the traditional generalized integrator is used, the frequency drift of the power grid will greatly reduce the integral gain of every harmonic, so as to increase the steady-state error of the system. In this regard, a parameter-based online adjustment A new type of generalized integrator; In addition, in order to suppress LCL filter resonance in the system, you need to add passive or active damping. Grid impedance changes in a wide range, will reduce the damping effect or even cause system instability, this paper proposes a new active damping method based on sliding mode control. Simulation and experimental results show that the new control method makes the system robust to the grid parameters.