基于LCL型三相并网逆变器的改进PR控制策略研究  

Research on Improved PR Control Strategy for Three-Phase Grid-Connected Inverter Based on LCL Filter

作　　者：谢永流 李永东[1,2] 程志江[1] 华东[1] 赵方华[1] 高龙 

机构地区：[1]新疆大学电气工程学院,乌鲁木齐830008 [2]清华大学电机工程与应用电子技术系,北京100084 [3]国网宜宾供电公司,四川宜宾644000

出　　处：《电测与仪表》2014年第21期74-78,共5页Electrical Measurement & Instrumentation

基　　金：国家自然科学资助基金(61364010);科技支疆项目(2013911036);新疆研究生科研创新项目(XJGRI2014028)

摘　　要：虽然以d-q坐标系下矢量控制为代表的线性控制可以消除系统稳态误差问题,但是系统存在功率耦合问题,使系统难以在功率单位因数下稳定运行。文章在传统电流PI控制的基础上,提出一种基于静止α-β坐标系下的PR控制,并对该控制策略进行改进,减少了一些复杂的坐标变换。在动态对比仿真中表明,采用改进PR控制的并网逆变器具有较好的动态响应性能,能实现电流无稳态误差跟踪电流参考值,在入网电流发生突变后能快速跟踪电网电压,并实现了有功无功的解耦控制。经过谐波含量分析,改进的PR控制策略也具有一定谐波抑制能力。Although the linear control represented by d-q coordinates vector control can eliminate the system steady-state error, there are power coupling problems in the system,which makes the system be difficult to realize stable oper-ation with a unit power factor.A static alpha beta coordinates system based PR control strategy is proposed in this pa-per based on the traditional current PI control.The PR control has been improved which will reduce complex coordi-nate transformation.Dynamic contrast simulation show that the improved PR control grid inverter apparatus has good dynamic response performance and can realize no steady-state error tracking current reference value.Moreover, it will quickly track the power grid voltage after the net current mutation so as to realize the decoupling control of active and reactive power.Analysis on harmonic content show that the improved PR control strategy has certain harmonic suppression.

关 键 词：功率单位因数 PR控制器 并网逆变器 电网电压 解耦控制 

分 类 号：TM614[电气工程—电力系统及自动化]