摘要
高效、可靠的双向开关换流技术是矩阵变换器控制的一个重要问题。文中在分析了矩阵变换器的空间矢量调制控制策略和应用较为广泛的四步换流的基础上,定量分析了换流步长引起的输出电压损失。在四步换流中,换流步长由器件特性和负载最大电流决定,在负载电流变化情况下,换流步长仍保持不变。文中提出了用可编程逻辑器件(PLD)实现的自适应换流,在自适应换流中,换流的步长根据负载电流绝对值大小实时变化,从而能够减小输出电压的损失和畸变。实验证明用PLD实现的矩阵变换器自适应换流简单、可行,换流步长能够跟随负载电流实时变化,减小了换流的死区效应和输出电压的畸变和损失、谐波成分,进而可以减小输出电流的谐波成分。
A matrix converter, which offers many advantages over conventional AC-AC converters, is becoming more and more attractive, but it faces a great challenge that is how to achieve safe and effective phase circuit commutation. The relationship between the commutation step time and the output voltage distortion is analyzed, and based on the four-step commutation, an adaptive commutation method by using programmable logical device (PLD) is developed to improve the safety and efficiency of the power circuit commutation. In the adaptive commutation, the step time is changing according to the amplitude of the load current, so the output voltage distortion is reduced. Furthermore, the experimental results verify the method.
出处
《电力系统自动化》
EI
CSCD
北大核心
2004年第17期60-63,共4页
Automation of Electric Power Systems
基金
国家自然科学基金资助项目(50237030ZD)
浙江省院士基金资助项目
关键词
矩阵变换器
四步换流
自适应换流
可编程逻辑器件
matrix converter
four-step commutation
adaptive commutation
programmable logical device (PLD)
