【摘要】 弱电网下存在的电网阻抗会导致控制系统鲁棒性降低，丰富的电网背景谐波使得进网电流质量下降。为解决以上问题，提出一种改进型的重复控制与多谐振前馈控制相结合的控制策略，重复控制能够消除电网周期性的扰动，并联比例调节器可加快系统的动态响应能力，谐振前馈使前馈通道仅在电网背景谐波频率处具有反馈作用，可以消除大量的电网背景谐波对系统的影响，增强了并网逆变系统对弱电网环境的良好适应性。利用Matlab/Simulink仿真平台搭建模型，证明了所提控制策略的正确性与有效性。更多还原

【Abstract】 The robustness of the control system will be reduced due to the existence of grid impedance under the weak current grid, and the quality of incoming current decreases because of the rich background harmonic of the grid. In order to solve the above problems, an improved control strategy combining repetitive control and multi resonance feedforward control is proposed in this paper. Repetitive control can eliminate the periodic disturbance of power the grid, the parallel proportional regulator can speed up the dynamic response of the system, and resonance feedforward makes feedforward channel have feedback function only at the background harmonic frequency of the power grid, which can eliminate abundant background harmonics of the power grid. The impact on the system enhances the good adaptability of the grid-connected inverter system to the weak grid environment. The model is built on the MATLAB/Simulink simulation platform, which proves the correctness and effectiveness of the proposed control strategy.更多还原