耦合电抗器在并联型三相并网逆变器中的应用  

Application of interphase inductor for parallel three-phase grid-connected inverters

作　　者：李瑞[1] 徐殿国[1] 徐壮[1] 苏勋文[1] 

机构地区：[1]哈尔滨工业大学电气工程及自动化学院,黑龙江哈尔滨150001

出　　处：《电机与控制学报》2012年第12期7-12,共6页Electric Machines and Control

基　　金：国家自然科学基金(51107015);黑龙江省科技厅计划项目(GC10A202)

摘　　要：为提高三相并网逆变器的功率等级,提出一种由耦合电抗器组成的新型并联型三相并网逆变器,通过对耦合电抗器去耦得出并联型逆变器的等效电路,并分别在三相静止坐标系和同步旋转坐标系下建立平均模型,阐明耦合电抗器抑制零序环流的根本机理,即耦合电抗器可以增大零序环流阻抗。根据所得平均模型设计电流解耦控制策略,抑制了零序环流,解决了零序环流引起的不均流、波形畸变问题,提高了系统的可靠性和效率。最后,对一组1.5 MW并联型三相并网逆变器进行了仿真验证,结果证明了上述分析及控制策略的正确性。To increase the power rating of three-phase grid-connected inverters, a topology of parallel three-phase grid-connected inverters composed of interphase inductors is proposed. The equivalent circuit was derived by decoupling the interphase inductors. Besides, the average-value models were obtained in the three-phase stationary coordinates and the synchronous rotating coordinates respectively. The funda- mental mechanism of zero-sequence circulating current suppression with interphase inductors is that the interphase inductors can increase the impedance of zero-sequence circulating current. Then the control strategy of the system was designed according to the average-value model in the synchronous rotating coor- dinates. The zero-sequence circulating currents were suppressed well and the discrepancy and distortion of currents were overcome. Therefore, the reliability and efficiency of the system were improved. Finally, the parallel three-phase grid-connected inverters with the power rating of 1.5 MW were simulated, which verified the validity of the above analysis and control strategy.

关 键 词：并网逆变器 耦合电抗器 并联运行 零序环流 平均模型 

分 类 号：TM464[电气工程—电器]