基于阻性下垂的逆变器无线并联均流控制  

Wireless Current Sharing Scheme for Parallel Operation of Inverters Using Resistive Output Impedance

作　　者：林燎源[1] 林钊[1] 刘伟[1] 马皓[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》2016年第8期43-50,共8页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(51177149);浙江省重点科技创新团队项目(2010R50021);高等学校博士学科点专项科研基金(20130101110108)资助项目

摘　　要：通过电压、电流双闭环控制参数的设计将逆变器输出阻抗调整为阻性,提出一种改进的基于阻性输出阻抗的功率下垂策略,加入自适应虚拟电阻以调节逆变器等效输出阻抗,改善有功功率调节,削弱有功功率均分同输出电压幅值的强耦合,在并联单元输出电压幅值由于不可控因素造成一定程度差异时也能实现较好的功率均分。引入电压参考前馈,用于补偿瞬时值电压环未引入积分环节造成的空载闭环增益损失。有效值环的加入在保证系统负载调整率的同时,也使得系统闭环不会出现过增益。实验结果表明所提控制方案应用于阻性逆变器无互联线并联均流控制的有效性。This paper proposes an improved load sharing controller for parallel connected inverters. The voltage and current dual-loop proportional control method is designed to implement resistive output impedance, and the Q-ω and P-V droop method is adopted. An adaptive virtual resistor is added to regulate the magnitude of the output impedance according to the requirements of active power sharing, which weakens the coupling between the current sharing control and output voltage amplitudes of paralleled inverters. The feedforward of the reference voltage is employed to increase the gain of the system, and the RMS（root-mean-square） loop is adopted to maintain small steady-state error of output voltage. Experimental results demonstrate the validity of the proposed scheme.

关 键 词：逆变器 并联 阻性输出阻抗 虚拟阻抗 前馈 

分 类 号：TM464[电气工程—电器]