不对称电网电压条件下三相并网型逆变器的控制  

Investigation on Control of Three-Phase Grid-Connected Inverters Under Unbalanced Grid Voltage Conditions

作　　者：章玮[1] 王宏胜[1] 任远[1] 胡家兵[1] 贺益康[1] 

机构地区：[1]浙江大学电气工程学院,杭州310027

出　　处：《电工技术学报》2010年第12期103-110,共8页Transactions of China Electrotechnical Society

基　　金：国家863计划(2007AA05Z419);浙江省自然科学基金(Y1080287)资助项目

摘　　要：介绍了一种用于三相并网型逆变器的新型电流控制器,即比例谐振电流调节器(PR)。不平衡电网电压条件下,该电流调节器可直接在两相静止坐标中对输出电流进行调节,无需进行正、负序分解便可直接对输出电流的正、负序分量控制。在一台容量为1.5kVA的并网逆变器实验样机上,分别对传统单个PI调节器、双dq、PI调节器和PR调节器进行了对比验证,实验结果证明了所提PR电流控制方案可改善三相并网逆变器系统的动态性能,提高系统的不对称故障穿越能力。This paper proposes a novel control scheme of three-phase grid-connected inverters（GCIs）,in which a proportional plus resonant（PR） regulator is adopted.The PR regulator,which is tuned at the synchronous angular frequency,can be applied in the stationary reference frame directly.Furthermore,the PR regulator does not require any decomposition of positive-and negative-sequence currents.It will improve the performance of the grid-connected inverters during the transient process of the unbalanced grid voltage fault condition,and its fault ride through capability will be enhanced as well.Compared with the conventional PI control scheme and dual-PI control scheme,the correctness of the theoretical analysis and the feasibility of the unbalanced control scheme with the PR current regulator are validated by detailed experimental tests.

关 键 词：电网不平衡故障 并网型逆变器(GCIs) 比例谐振调节器(PR) 双dq PI调节器 故障穿越能力 

分 类 号：TM464[电气工程—电器]