SPWM电流跟踪并网逆变控制技术研究  

Research on Grid-connected Control Based on SPWM Current Track

作　　者：高嵩[1] 王辉[1] 何宁[1] 陈超波[1] 

机构地区：[1]西安工业大学电子信息工程学院,西安710032

出　　处：《西安工业大学学报》2011年第1期74-77,83,共5页Journal of Xi’an Technological University

基　　金：西安市科技创新支撑计划项目(CXY1009-4);西安工业大学校长基金(XAGDXJ0915)

摘　　要：针对传统的正弦脉冲宽度调制(Sinusoidal Pulse Width Modulation,SPWM)电流跟踪并网逆变控制方法的电流响应较慢,跟随误差较大,易受电网电压影响的问题,提出了一种改进的SPWM电流瞬时值跟踪控制方法.介绍了单相并网逆变主电路拓扑结构,对改进型SPWM电流控制方式进行了描述和分析,建立了并网电流闭环控制系统的数学模型.系统中运用了闭环控制模式,加入了电压前馈补偿环节,通过控制逆变系统的输出电流以跟踪市电的变化,与电网电压同频、同相.仿真结果表明,改进后的方法输出电流波形谐波畸变含量为0.26%,加入PI控制环节的调整时间为0.2 s.The traditional SPWM inverter control method of the current tracking interconnection has the disadvantages of lower current,bigger follow error and liability to being affected by network voltage.An improved SPWM current instantaneous tracking control method is proposed.The single-phase grid inverter circuit topology is introduced first.Then the modified SPWM current control modes are described and analyzed,and the mathematical model of the grid current closed-loop control system is established.Finally,the improved SPWM current control mode was simulated.Simulation results show that the content of harmonic distortion is significantly reduced while the real-time performance is greatly improved.

关 键 词：并网逆变器 电流跟踪控制 SPWM 谐波畸变 

分 类 号：TM464[电气工程—电器]