The Control and Implementation of Three-Phase Four-Leg DC-to-AC Power Inverter

• Main Authors: Wei-You Sun, 孫瑋佑
• Other Authors: Yin-Chin Wu
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/38861606677135525723

碩士 === 清雲科技大學 === 電機工程研究所 === 96 === Generally,the traditional three-phase three-leg DC-to-AC power inverter are used widely with three phase balanced loads. But, when the three-phase loads are unbalanced, that three phase voltage outputs can not be symmetrical. In this paper presents a three-phase four-leg DC-to-AC power inverter can be supply a midpoint to three phase unbalanced loads.So the three-phase four-leg DC-to-AC power inverter outputs three phase symmetrical voltages. Using symmetrical model analysises three-phase four-leg DC-to-AC power inverter how it suppresses the unbalanced loads. The mathematic model of three-phase four-leg DC-to-AC power inverter is established in different coordinates. Paper accomplishes the decoupling of the three-phase four-leg DC-to-AC power inverter. PI double loop controller based on synchronous frame is applied. The control circuit cosists of digital processor(DSP TMS320F2808PZA),which programmed in C language. The performance of system is simulated MATLAB SIMULINK. Experiments the three-phase four-leg DC-to-AC power inverter can output three-phase balanced AC voltage under the unbalanced loads conditions.