两相静止坐标系下并网逆变器的重复控制策略  

Repetitive Control Strategy for Grid-Connected Converters in Stationary Frame

作　　者：张学广[1] 马彦[1] 李瑞[1] 张文杰[1] 徐殿国[1] 

机构地区：[1]哈尔滨工业大学电气工程及自动化学院,哈尔滨150001

出　　处：《电工技术学报》2016年第9期85-91,共7页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(51107020;51577040;51237002);台达电力电子科教发展基金资助项目

摘　　要：采用LCL型滤波器的三相PWM并网逆变器在同步旋转坐标系下的数学模型存在耦合项,另外当并网电压不平衡或含低次谐波时,输出电流波形会产生畸变。针对以上问题,提出一种两相静止坐标系下的电流重复控制方法。该方法不需要进行Park变换和解耦计算,可有效降低逆变器并网电流的总谐波畸变。详细给出了重复控制器的参数设计方法,同时考虑了LCL滤波器硬件参数和系统延迟的影响。最后通过仿真和实验验证了理论分析的正确性和控制策略的有效性。In the synchronous rotating frame, coupling exists in the mathematical model of the gridconnected inverters adopting LCL filters. And serious distortion occurs in the inverter output current under unbalanced grid voltage or with low order harmonics in the grid voltage. Considering problems mentioned above,this paper presents a current repetitive control strategy in the stationary frame. The proposed method does not require the Park transformation or the decoupling process. It is able to effectively reduce the total harmonic distortion of the injected grid current. The specific design method of the repetitive controller is provided,considering the hardware parameters of the LCL filter and the influence of the system delay. Simulation and experimental results are presented in the end, which verifies the validity of the theoretical analysis and the effectiveness of the proposed method.

关 键 词：三相并网逆变器 两相静止坐标系 重复控制 谐波抑制 

分 类 号：TM464[电气工程—电器]