中文摘要：

光伏并网系统中,为了抑制逆变器参数不确定和外界干扰对输出电能的影响,提出了鲁棒双闭环控制策略。首先设计电压环线性化自抗扰鲁棒控制器,以稳定直流侧母线电压;其次建立系统电流环的广义参数不确定模型,并利用LMI设计了电流环鲁棒H∞控制器,实现对逆变器有功电流和无功电流的精确控制。通过仿真与传统PI控制方法进行比较,验证了该控制策略可以有效地消除模型不确定因素和外界扰动对系统输出性能的影响,增强光伏并网系统的鲁棒稳定性。

英文摘要：

In order to suppress the influences of inverter parameter uncertainties and grid disturbances to the output power quality,the robust dual-loop control strategy of photovoltaic grid inverter is proposed. Firstly,design linearauto disturbances rejection robust controller in the voltage loop to stabilize the DC bus voltage. Secondly, generalized parameter uncertainty model of current loop is built, and the robust H∞ controller is designed by using LMI in the current loop, to achieve precise control of active current and reactive current. Compared with the traditional PI controller, the simulations verify that the controller has strong robustness about parameters variations and grid disturbances.