级联型变流器直流母线空载振荡分析与环路优化设计  

Analysis of DC Bus Oscillation for Cascaded Converter with No Load and Its Control Loop Optimal Design

作　　者：陈轶涵[1] 陈杰[1] 韦徵[1] 龚春英[1] 

机构地区：[1]南京航空航天大学自动化学院,南京210016

出　　处：《电工技术学报》2015年第18期16-24,共9页Transactions of China Electrotechnical Society

摘　　要：针对两级式静止变流器空载时出现直流母线低频振荡的问题开展研究。基于前级直-直变换器在电流连续(CCM)和电流断续(DCM)状态的小信号模型,分析了CCM和DCM状态下开环系统参数与补偿网络对于系统稳定性的影响,利用Matlab仿真软件绘制系统幅相曲线,揭示了级联型变换器直流母线电压在空载状态下低频振荡产生的原因及其与环路参数的关系。针对后级逆变器空载以及轻载状态,兼顾CCM状态的稳定性和动态性研究分析了前级直-直变换器电路参数和补偿网络设计规则,通过Saber仿真验证了设计规则的有效性。最后在4k V·A航空静止变流器实验平台上进行了实验验证,给出了相应的动态和稳态实验波形,表明了分析结果正确性和所提方法有效性。Based on the continuous conduction mode（CCM） and discontinuous conduction mode（DCM） small signal modeling of preceding stage average current control phase shift full bridge converter, influences to stability of open loop parameters and compensating network are analysised.It also draw bode diagram by use of Matlab simulation, announce the cause of DC bus oscillation of cascade converter with no load, and relationship between oscillation and control loop parameters. Compensating network should be optimal designed in order to suppress DC bus oscillation. Considering stability and dynamics of converter works in CCM mode, this paper analysis design rule of compensating network for converter works in DCM mode. Conclusion is tested in a 4k V·A cascade converter, which is consisted of phase shift full bridge converter and three bridge four legs inverter. Simulation and experiment results prove theoretical analysis is correct.

关 键 词：移相全桥直-直变换器 级联式变换器 平均电流控制 低频脉动 空载 电压环增益 

分 类 号：TM461[电气工程—电器]