摘要
研究优化供电系统质量,为保证电网电压非正常工况下矩阵变换器(MC)的安全稳定运行,为了补偿输入不平衡和抑制谐波,提出一种带前馈补偿的双空间矢量闭环控制策略。通过检测虚拟直流电压值的变化实时调节空间矢量调制系数实现前馈补偿;将实际输出电压和期望输出电压的偏差作为负反馈加到下一个采样周期的开关调整函数矩阵中,实现输出电压负反馈闭环控制。仿真结果表明:具有前馈补偿方案的闭环控制策略,可以有效抑制矩阵变换器在电网电压非正常工况下输出电压及输入、输出电流波形的畸变,谐波含量明显减少。从而验证了控制方案的正确性。
A closed-loop control strategy with feed-forward compensation was proposed to ensure matrix converter operating in safe and stable mode under abnormal grid voltage conditions.The space vector modulation factor was adjusted in real-time according to the variation of the virtual dc link voltage to realize feed-forward compensation.In order to achieve negative feedback closed-loop control of the output voltage,the discrepancy between the actual and expected output voltage was added into the switch modulation matrix as a negative feedback during the next sampling period.Simulation results indicated that the distortions of waveforms of the output voltages and input（output） current can be effectively suppressed and the harmonic components can be obviously reduced when the proposed closed-loop control strategy with feed-forward compensation was adopted.The correctness of the control scheme was verified.
出处
《计算机仿真》
CSCD
北大核心
2011年第10期292-296,共5页
Computer Simulation
基金
国家自然科学基金重点项目(60534040)
广东省教育厅专项重点实验室项目(IDSYS200701)
广东省科技计划项目(2009B101900052)
关键词
矩阵变换器
双空间矢量
闭环控制
前馈补偿
不平衡
Matrix converter
Double space vector modulation
Closed-loop control
Feed-forward compensation
Unbalance
