改进型线性自抗扰控制的微网逆变器控制

Improved Linear Autodisturbance Rejection Control for Microgrid Inverter Control

针对传统微网运行中逆变器控制以传统PI控制为基础控制策略抗扰效果不足的问题,采用自抗扰控制策略优化控制系统内环部分的控制,由于新能源发电系统的大规模接入导致微网运行在弱电网条件下,为了提升控制系统的扰动估计以及电网系统中扰动对于微网控制性能的影响,对传统自抗扰控制改进,提出级联型自抗扰控制策略。从频域部分分析了级联型自抗扰控制动态响应以及扰动抑制的效果都优于线性自抗扰控制。仿真实验结果表明,优化的控制策略对电网电压跌落、高电网阻抗有更好的效果,可平滑过渡并/离网切换出现的电流跳变。所提策略有更好的稳定性及鲁棒性。

Aiming at the problem of insufficient anti-disturbance effect of traditional PI control strategy based inverter control in traditional microgrid operation,active disturbance rejection control strategy is used to optimize the control of the inner loop part of the control system.Due to the large-scale access of new energy generation systems,the microgrid operates under weak grid condi-tions.In order to improve the disturbance estimation of the control system and the impact of disturbances in the power grid system on the control performance of the microgrid,traditional control strategy is improved,a cascaded ADRC strategy is proposed.In the fre-quency domain,it is found that the better control strategy outperforms traditional ADRC in terms of re-disturbance estimation and disturbance suppression.The simulation experiment results show that the ADRC strategy has a better effect on dealing with voltage drops and high grid impedance in the power grid,and can smoothly transition to current jumps that occur during connected/off grid switching.The proposed strategy has better stability and robustness.