单相电力电子变压器整流级新型直接功率控制策略

Single-phase power electronic transformer rectifier stage new direct power control strategy

中文关键词  电力电子变压器  单相级联H桥整流器  直接功率控制  级联延时信号消除  电容电压平衡

英文关键词  power electronic transformer  single phase cascaded H-bridge rectifier  direct power control  cascaded delayed signal cancellation  capacitor voltage balance

中文摘要

      针对传统dq电流解耦双闭环控制的单相级联H桥整流器受系统电感参数变化的影响, 同时为避免系统频率 偏移的干扰, 提出了一种无需电感参数和系统角频率的新型直接功率解耦控制器, 实现了有功、无功功率的独立控 制. 并利用级联延时信号消除算法提取基波正序分量, 消除谐波信号带来的影响. 在MATLAB/Simulink中搭建了三 级联H桥整流器进行仿真分析, 仿真结果验证了所提控制方法下直流侧电压波动小, 系统响应速度快, 谐波抑制能 力强的特点.

英文摘要

      For the traditional dq current decoupling dual closed-loop control of single-phase cascaded H-bridge rectifier is affected by the change of system inductance parameter, and to avoid the interference of system frequency offset, a new direct power decoupling controller without inductance parameter and system angular frequency is proposed to realize the independent control of active and reactive power. At the same time, it utilizes a cascaded delayed signal cancellation algorithm to extract the fundamental positive sequence components and eliminate the effects caused by harmonic signals. The proposed control method is validated by simulating a three-stage H-bridge rectifier in MATLAB/Simulink with low DC-side voltage fluctuation, fast system response, and high harmonic suppression.