参数不确定并网逆变器的H_∞控制算法  

H_∞ Control Algorithm for Grid-connected Inverter with Uncertainty Parameters

作　　者：贤燕华[1] 江明轩 王世强 XIAN Yan-hua;JIANG Ming-xuan;WANG Shi-qiang(College of Electronic Engineering,Guangxi Normal University,Guilin 541004,China)

机构地区：[1]广西师范大学电子工程学院

出　　处：《水电能源科学》2019年第11期185-188,206,共5页Water Resources and Power

基　　金：国家自然科学基金地区科学基金项目(11562003);广西高校中青年教师基础能力提升项目(KY2016YB070);广西师范大学博士科研基金项目(2015BS17A4)

摘　　要：针对并网逆变器中的电容和电感元件存在参数不确定性及直流输入电压变化且有噪声干扰的问题,研究了提高逆变器并网电流质量的H∞控制算法。首先通过一阶泰勒近似的方法建立LCL型并网逆变器的参数不确定模型;其次选取低通滤波器作为性能加权函数以减小输出误差,构建包含并网逆变器参数不确定模型和性能加权函数的增广控制系统;最后求解出最优H∞控制器。仿真试验表明,该控制输出的并网电流在扰动条件下仍能够稳定,且响应速度快、谐波少,与电网电压同频同相,符合并网的要求。This paper addresses the problem of H∞controller design for grid-connected inverter with capacitance and inductance parameter uncertainties,the DC input voltage variation and noise jamming.Firstly,the parameter uncertainty model of grid-connected inverter was established by the method of first-order Taylor approximation.To reduce output error,a low-pass filter was selected as a performance weighting function.An augmented control system was constructed which includes the parameter uncertainty model of grid-connected inverter and the performance weighting function.Finally,the optimal H∞controller was given.The simulation results show that the controlled grid current can be stable under the disturbance condition.Moreover,the grid current has the advantages of fast transient response,less harmonic and same frequency and phase with grid voltage,which meets the requirements of grid connection.

关 键 词：H∞控制 不确定模型 扰动抑制 并网逆变器 鲁棒性 

分 类 号：TM464[电气工程—电器]