基于负载电流前馈的虚拟同步整流器控制策略  

A Load Current Feedforward Control Strategy for Virtual Synchronous Rectifier

作　　者：王仕欣 曹鑫[1] 钱胜南 李家伟 WANG Shi-xin;CAO Xin;QIAN Sheng-nan;LI Jia-wei(School of Automation,Nanjing University of Aeronautics&Astronautics,Nanjing 211106,China)

机构地区：[1]南京航空航天大学,自动化学院,江苏南京211106

出　　处：《电力电子技术》2025年第3期1-5,10,共6页Power Electronics

基　　金：国家自然科学基金(52377056)。

摘　　要：虚拟同步整流器通过在整流器控制中嵌入同步电机模型,实现负荷侧与电网的友好交互。直流侧电压受负载扰动影响会上下波动,不利于系统的可靠运行。通过建立同步整流器系统的小信号模型,阐述了直流电压在负载电流扰动下的波动机理,通过波特图分析了主要参数变化对直流电压动态响应的影响规律;从降低直流侧输出阻抗的研究角度出发,提出了负载电流常系数前馈和动态补偿前馈的控制策略,并基于小信号模型给出了前馈控制器设计方法。通过仿真和实验验证了前馈控制策略可有效降低负载突变时的直流电压波动,减小过渡时间,且动态补偿前馈相较于常系数前馈具有更优的抗负载扰动性能。Virtual synchronous rectifier can realize friendly interaction between load-side and power grid by embedding synchronous motor model in rectifier control.The load disturbance will make the DC side voltage fluctuate greatly,which is not conducive to the reliable operation of the system.By establishing a small-signal model of synchronous rectifier system,the fluctuation mechanism of DC voltage under load current disturbance is described,and the influ-ence of main parameters on DC voltage dynamic response is analyzed by using Bode diagrams.From the point of view of reducing the output impedance of DC side,the control strategies of constant coefficient feedforward and dynamic compensation feedforward for load current are proposed,and the design method of feedforward controller based on small signal model is given.Simulation and experiment verify that the feedforward control strategy can effectively re-duce the DC voltage fluctuation under load mutation,reduce the transition time,and the dynamic compensation feed-forward has better anti-load disturbance performance compared with constant coefficient feedforward.

关 键 词：虚拟同步整流器 负载扰动 前馈控制 

分 类 号：TM461[电气工程—电器]