新型RISE-LADRC逆变器电压控制策略

A novel RISE-LADRC voltage control strategy of microgrid inverter

当微网逆变器中出现不平衡负载和非线性负载等强扰动时,传统线性自抗扰控制(LADRC)的抗扰能力不足,针对此问题提出一种误差符号鲁棒积分(RISE)与LADRC相结合的新型RISE-LADRC控制策略。通过采用RISE控制律来代替线性状态误差反馈律(LSEF),可减小控制器对线性扩张状态观测器(LESO)的依赖,当LESO的观测带宽一定时,RISE控制能有效地抑制系统中存在的扰动,并利用李雅普诺夫稳定性定理证明了所提控制策略的稳定性。仿真及实验结果表明,在微网逆变器中出现强扰动的情况下,相比传统LADRC控制策略,RISE-LADRC控制策略提高了控制器的跟踪精度,减小了稳态误差且表现出更好的抗扰能力。

Aiming to the problem that microgrid inverter system exists strong disturbances,such as unbalanced load and non-linear load,the anti-disturbance ability of the linear active disturbance rejection control(LADRC)is insufficient.Combining robust integral of the sign of the error(RISE)with LADRC,a novel RISE-LADRC control strategy is proposed.The RISE control law is adopted to replace the linear state error feedback law(LSEF)for reducing the dependence of the controller on the linear extended state observer(LESO).When the observation bandwidth of the LESO is limited,RISE control can effectively suppress the disturbance in the system,and it improves the tracking performance of the controller and reduces steady-state error.Based on Lyapunov stability theorem,the stability of the proposed control strategy is proved.Simulation and experimental results show that the proposed control strategy exhibits better robustness and anti-disturbance ability than the traditional LADRC control strategy in the case of strong disturbances in the microgrid inverter.