摘要
空间矢量脉宽调制和双向开关多步换流方式是矩阵式变换器的基本控制策略。针对多步换流过程在空间矢量脉宽调制中所引起的最小脉宽限制和输出波形畸变,提出一种优化调节方法。通过调整各个开关状态的脉宽,使整个采样周期内仍保持9段开关状态,并且每段开关状态的持续时间均大于双向开关多步换流过程。在一台2·7kVA的矩阵式变换器样机上进行实验验证。实验结果表明,采用提出的空间矢量脉宽调制优化调节策略,不仅消除了输出电压中的错误脉冲,而且降低了输出电压的总谐波畸变率(THD),在输出频率为15Hz时,THD降低约15%,有效地提高了矩阵式变换器的输出波形质量,保证了系统的安全可靠运行。
Space vector pulse width modulation （SVPWM） and multi-step commutation method of bi-di- rectional switches are the basic control strategies of the matrix converter. In order to reduce the output distortion caused by the multi-step commutation process under SVPWM and multi-step commutation, an optimization method for the adjustment of switching state distribution was proposed. By using this method, 9 switching states were ensured during a sampling period of the matrix converter, and the duration of each switching state was longer than muhi-step commutation process. The experimental verification has been conducted on a 2.7kVA matrix converter prototype. The results demonstrate that, the output voltage errors are avoided and the total harmonic distortion （THD） of the output voltage is reduced, and THD can be reduced 15% while output frequency is 15Hz. The output waveform quality and reliability of the matrix converter are enhanced by the proposed optimization method.
出处
《电机与控制学报》
EI
CSCD
北大核心
2009年第6期886-890,共5页
Electric Machines and Control
基金
国家自然科学基金(50607012)
关键词
矩阵式变换器
空间矢量脉宽调制
双向开关
多步换流方式
总谐波畸变率
matrix converters
space vector purse width modulation
hi-directional switch
multi-stepcommutation method
total harmonic distortion
