基于相电流误差补偿的光伏并网逆变器控制  

Control Based on the Phase Current Error Compensation for PV Grid-connected Inverter

作　　者：赵德勇[1] 吴志清[1] 胡杨[1] 

机构地区：[1]合肥工业大学,电气与自动化工程学院,安徽合肥230009

出　　处：《电力电子技术》2015年第1期82-84,共3页Power Electronics

摘　　要：传统电压源型并网逆变器为提高动态响应性能和并网电流品质,采用基于电网电压定向及前馈的双闭环控制策略。但当电网出现严重不平衡状况,会影响并网逆变器正常运行。这里提出一种混合控制并网策略,在传统双闭环控制环路上增加一条比例调节控制回路,比例调节器发出的补偿电压,抵消由电网不平衡导致的电流畸变。最后实验结果表明补偿后并网电流波形基本对称,改善了逆变器并网品质。In order to improve the performance of dynamic response and grid current quality, double closed loop control which based on grid voltage orientation and feed forward strategies is adopted in traditional voltage source gridconnected inverter.However, when the grid severe imbalances, it will affect the normal operation of grid-connected inverter.A hybrid control grid-connected strategy that adding a proportional control to the double-loop vector control is proposed.The proportional regulator output compensation voltage to offset the negative sequence current caused by the grid imbalance.Finally,experimental results show that the compensation and the net current waveform is symmetric, and the quality of the inverter is improved.

关 键 词：逆变器 混合控制 电网不对称 

分 类 号：TM464[电气工程—电器]