基于萤火虫优化算法的不平衡网压下VSR自抗扰控制

传统控制方式下,三相VSR在电网电压不平衡时的网侧电流谐波较大,且其动态性能容易受到负载扰动的影响.针对这一问题,文中提出了一种基于萤火虫优化算法的自抗扰控制策略.在系统的电流内环加入一种与对象模型无关的自抗扰控制器对其进行闭环控制,及时对系统内外扰动进行主动补偿和抑制.同时,利用萤火虫优化算法对自抗扰控制器的关键参数...

Active Disturbance Rejection Control of VSR under Unbalanced Grid Voltage Based on Firefly Optimization Algorithm

Under the traditional control mode, the grid-side current harmonics of three-phase VSR are large when the grid voltage is unbalanced, and its dynamic performance is easily affected by load disturbance. In view of this problem, an active disturbance rejection control strategy based on firefly optimization algorithm is proposed. The active disturbance rejection controller which is not related to the object model is added to the inner current loop of the system to perform closed-loop control to initiatively compensate and restrain the internal and external isturbances of the system in time. At the same time, the firefly optimization algorithm is adopted to optimize the key parameters of the ADRC. The algorithm has a faster convergence speed while searching for the optimal value of the objective function globally, which improves the control performance of the system. The simulation results show that compared with the traditional control method, the total harmonic distortion rate of the grid-side current is reduced by 3.67% and the anti-load disturbance ability of the rectifier is effectively improved, which verifies the correctness and effectiveness of the control strategy.