基于滑模变结构的三相并网逆变器重复比例控制策略

针对三相并网逆变器在暂态能量反馈中的快速性与抗扰动性的要求，提出了一种重复比例控制与滑模变结构控制的自适应加权控制策略。首先对滤波器构建数学模型并进行求解，通过对滤波器的状态方程进行求解，采用重复比例控制提高逆变器的稳定性，再利用高频控制器对滑模开关函数进行替代，在保证鲁棒性的同时减小控制的抖振，再通过加权控制器根据电流误差值实时调节两种控制的权重比以实现两种控制的稳定过渡与切换达成高质量并网，最后利用Simulink软件对三种控制在相同条件下分别进行仿真。通过对比验证，发现利用加权控制策略优化了等效控制的跟踪特性，不仅能加快了系统的响应速度，抑制了并网电流谐波，且还有效地提高了系统的鲁棒性，控制精度更高。

Repeated proportional control strategy of three-phase grid-connected inverter based on sliding mode variable structure

This work suggests an adaptive weighted control approach combining repeating proportional control and sliding mode variable structure control to address the needs of rapidity and anti-disturbance of three-phase grid-connected inverter in transient energy feedback. Both the state equation for the filter and the mathematical model have been solved. The inverter''s stability is increased by repetitive proportional control, and the role of the sliding mode switch is replaced by the high-frequency controller. Small control chattering, followed by real-time weighted controller adjustment of the weight ratio of the two controls in accordance with the current error value to produce stable transition and switching of the two controls to produce high-quality grid connection. Finally, using simulink software, the PI control, sliding mode variable structure control, and weighted control of the two are simulated under the identical conditions. The employment of the weighted control method enhances the tracking properties of the equivalent control, which not only speeds up the system but also improves its accuracy. The adaptive weighted control may significantly increase the system''s resilience and control accuracy, and the reaction speed can suppress the harmonics of the grid-connected current.