基于复合电流控制策略下风电并网逆变器研究

Research on Composite Current Control Strategy for Grid Connected Inverter of Wind Energy Storage Device

针对并网逆变器控制中传统的双闭环控制策略在衡量逆变器动态性能方面表现不足,不能有效地抑制谐波、稳态精度不高、抗干扰能力较差的问题,提出了一种基于双闭环控制的改进复合电流控制算法。该算法通过在双闭环的电流环控制基础上,结合重复控制策略,在电流内环上加入重复控制器保证系统的稳定性和精确度。仿真和实验结果表明改进型复合控制算法稳态控制精确度高、动态性能良好,且具有较强的鲁棒性。

Aiming at the shortcomings of traditional double closed-loop control strategy in grid-connected inverter con trol ,such as inadequate performance in measuring the dynamic performance of inverter, ineffective suppression of har monics ,low steady?state accuracy and poor anti -interference ability , an improved compound current control algorithm based on double closed-loop control is proposed. Based on the double closed-loop current loop control and the repeti tive control strategy, the repetitive controller is added to the current loop to ensure the stability and accuracy of the system. Simulation and experimental results show that the improved algorithm has high steady-state control accuracy, good dynamic performance and strong robustness.