A Single-Phase PWM Current Source Type Converter Coupling with AC Chopper
A Single-Phase PWM Current Source Type Converter Coupling with AC Chopper
复制标题
与交流斩波器耦合的单相PWM电流源型变换器
DOI：
10.1541/ieejias.117.673
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
Y. Neba
中科院分区：
文献类型：
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作者：
Y. Neba
电流源型变换器通过采用PWM策略可以容易地在交流侧产生正弦电流。然而，在用于单相电源的转换器系统中，直流电流是脉动的，因为转换器的直流输出电压包含具有两倍于交流电源频率的交流分量。直流电流脉动导致交流电流波形失真。虽然使用具有大电感的直流电抗器允许直流电流脉动减小，但是包括直流电抗器的转换器设备的尺寸和重量变得更大。为了消除直流脉动，提出了采用两个全桥变换器的两相整流和交流斩波电路的变换器系统。针对这类变换器中构成电路的开关器件数目不可避免地增加的问题，提出了一种新型的单相电流源型变换器，该变换器采用交流斩波电路和PWM方法相耦合。在该电路中，主电桥中的两个开关器件与两个附加器件和一个电容一起构成交流斩波电桥。文中给出了实验波形、理论波形和稳态特性。结果表明，该变换器可以获得平滑的直流电流和正弦的交流电流，并且可以实现直流电感的大幅度降低。
A current source type converter can easily generate a sinusoidal current in the ac side by employing a PWM strategy. In the converter system for a single-phase supply, however, the dc current is pulsated because the dc output voltage of the converter contains the ac component with twice the ac supply frequency. The dc current pulsation causes the ac current waveform to be distorted. Although the use of the dc reactor with large inductance allows the dc current pulsation to decrease, the size and the weight of the converter equipment including the dc reactor become larger. A two-phase rectification by using two full-bridge converters and a converter system with ac chopper circuit have been proposed for the purpose of elimination of the dc pulsation. In these converters, the number of the switching devices which consist of the circuit can not avoid increasing.To solve such a problem, this paper proposes a novel single-phase current source type converter coupling with ac chopper circuit and the PWM method. In this circuit, two switching devices in the main bridge are used to form the ac chopper bridge with two added devices and a capacitor. This paper gives the experimental and the theoretical waveforms and the steady-state characteristics. The results prove that the smoothing dc current and the sinusoidal ac current are obtained, and the great reduction of the dc inductance can be achieved in the proposed converter.