LCL型光伏并网逆变器全局鲁棒滑模变结构双闭环控制  

Global robust sliding mode variable structure dual closed-loop control for grid-connected PV inverters with LCL filters

作　　者：刘吉宏 刘鹏飞[1] 张树新[1] 王刘菲[1] Liu Jihong;Liu Pengfei;Zhang Shuxin;Wang Liufei(College of Mechanical and Electrical Engineering,Beijing Polytechnic,Beijing 100176,China)

机构地区：[1]北京电子科技职业学院机电工程学院,北京100176

出　　处：《可再生能源》2020年第11期1495-1499,共5页Renewable Energy Resources

基　　金：国家自然科学基金资助项目(51677067);北京市属高等学校提高科技创新能力建设项目科技类博士重点课题(2017Z004-010-KXZ)。

摘　　要：为有效抑制谐振峰值,精确跟踪并网电流,文章采用双闭环的控制结构对LCL型光伏并网逆变器进行控制,其中:内环引入滤波电容电流的比例-惯性反馈环节,能够抑制有源阻尼谐振;外环采用全局鲁棒滑模结构控制,跟踪给定的正弦参考电流,同时对外界干扰和参数不确定性具有全局鲁棒性。仿真结果表明,该方法在稳态、动态性能方面能够满足控制要求,对参数摄动具有全局鲁棒性,能够抑制电网电压的谐振信号,在跟踪效果和抗干扰方面优于常规的PI控制算法。In order to effectively suppress the resonance peak and accurately track the grid-connected current,a double closed-loop control structure is adopted to control the grid-connected PV inverters with LCL filters.In the inner loop,the proportional-inertial feedback of filter capacitor current is introduced to suppress the resonance with the method of active damping.The outer loop adopts global robust sliding mode variable structure control to track the given sinusoidal reference current,and to obtain the global robustness to external disturbances and parameter uncertainties.The simulation results show that the proposed method can meet the control requirements in steady-state and dynamic performance,and has global robustness to parameter perturbation,furthermore,it can suppress the resonance signal of grid voltage.The method is superior to the conventional PI control algorithm on the aspects of tracking effect and anti-interference.

关 键 词：LCL型光伏并网逆变器 有源阻尼 电容电流反馈 全局鲁棒滑模控制 

分 类 号：TK81[动力工程及工程热物理—流体机械及工程]