一种基于虚拟电路闭环的单相PWM整流器控制新方法  

A Novel Closed-Loop Control Approach for Single-Phase PWM Rectifier Based on Virtual Circuit

作　　者：孙毅超[1] 赵剑锋[1] 季振东[1] 姚晓君[1] 

机构地区：[1]东南大学电气工程学院,南京210096

出　　处：《电工技术学报》2013年第12期222-230,共9页Transactions of China Electrotechnical Society

基　　金：江苏省产学研前瞻性联合研究项目(BY2011156);江苏省普通高校研究生科研创新计划(CXZZ13_0094)资助项目

摘　　要：基于dq旋转坐标系的前馈解耦控制策略广泛应用于三相PWM整流器场合。然而,在单相PWM整流器场合,由于主电路缺少一个自由度,为进行坐标变换需构造虚拟自由度。本文通过在控制系统构造离散的正交虚拟电路,实时计算得到与实际电压电流正交的虚拟分量,并对虚拟量进行反馈构成闭环控制。与传统通过实际物理量延时1/4个电网周期构造虚拟量的方法相比,该方法无需引入延迟环节,且对虚拟量进行了虚拟闭环控制,动态性能大大提高。另外,探讨了虚拟参数差异对控制性能的影响,仿真与实验对比验证了本文提出方法的正确性与有效性。Vector control method based on dq coordinates is considered as the most attractive way which enables controlling the active and reactive power separately without steady state error. However, a virtual component, which is orthogonal to the physical one, is required to establish when operating a single-phase system. Generally, the virtual component is obtained through delaying the real one sampled by the sensor, which introduces poor dynamic property and instability into the whole system. In order to solve the problem, a discrete and virtual circuit is set up in the control loop for receiving the responded virtual current along with the real one concurrently. Also, the impact of the differences of the virtual parameters and the real ones on the control performance is analyzed, which is validated by simulation and experiment.

关 键 词：单相PWM整流器 前馈解耦控制 虚拟电路 

分 类 号：TM461[电气工程—电器]