交直流混合电网并网PWM整流器控制策略  

Research on control strategy of PWM rectifier in AC/DC hybrid grid operation

作　　者：陈平飞 刘胜永 王曹阳 王琦 郑致飞 CHEN Pingfei;LIU Shengyong;WANG Caoyang;WANG Qi;ZHENG Zhifei(School of Electric and Information Engineering,Guangxi University of Science and Technology,Liuzhou 545006,China)

机构地区：[1]广西科技大学电气与信息工程学院,广西柳州545006

出　　处：《广西科技大学学报》2020年第1期25-31,共7页Journal of Guangxi University of Science and Technology

基　　金：国家自然科学基金项目(61563006);广西科技开发与计划课题(桂科攻1598008-2);广西研究生创新项目(GKYC201801)资助.

摘　　要：PWM整流器以其单位功率因数运行、网侧电流谐波少等优点被广泛运用于交直流混合电网中.针对PWM整流器强耦合,非线性的特点,提出了一种基于交流电网电流前馈解耦的双闭环控制策略,并对电压外环控制器与电流内环控制器进行详细的分析和设计.理论分析表明:该方法能够很好地进行dq坐标轴电流分量解耦;仿真验证了该方法在交直流混合电网并网时,根据直流电网状态实现并网整流/逆变运行:并网逆变时,PWM整流器单位功率因数运行;并网整流时,直流侧电压稳定输出,基本无超调,负载波动时,动态响应迅速.PWM rectifiers are widely used in AC/DC hybrid networks due to their unity power factor operation and low current harmonics on the grid side.Aiming at the strong coupling and nonlinearity of PWM rectifier,a double closed-loop control strategy based on AC feedforward decoupling is proposed in this paper.The voltage outer loop controller and current inner loop controller are analyzed and designed in detail.Theoretical analysis shows that the method can decouple the current component of dq coordinate axis well.The simulation proves that the method realizes grid-connected rectification/inverting operation according to the state of DC grid when AC/DC hybrid grid is connected to the grid:grid-connected inverter when the PWM rectifier is operated in unit power factor;when the grid is rec-tified,the DC side voltage is stably output,and there is basically no overshoot.When the load fluctu-ates,the dynamic response is rapid.

关 键 词：PWM整流器 电流前馈 交直流混合电网 解耦控制 并网运行 

分 类 号：TM762[电气工程—电力系统及自动化] TM461