Development of a partial switching three-phase rectifier circuit improving efficiency, power factor and harmonic current in a good balance

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K04348
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 21010:Power engineering-related
• Research Institution: University of Toyama
• Principal Investigator: AMEI Kenji 富山大学, 学術研究部工学系, 准教授 (50262499)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 部分スイッチング / 三相整流回路 / 高力率 / 高効率 / 2パルススイッチング / 高調波抑制

Outline of Final Research Achievements

The technique of the waveform improvement to be called "partial switching" equipped with by a single phase air-conditioner was introduced into a three-phase rectifier circuit. Authors have already proposed original single phase partial switching rectifier circuit. And it was confirmed that the circuit realized a characteristic of high power factor, high efficiency,and harmonic reduction in comparison with a conventional passive rectifier circuit. In this research, triphasic circuit configuration was proposed based on this single phase partial switching rectifier circuit. The reduction of the number of elements was investigated for further improving the efficiency afterwards. Because the connection of the switching element was moved from DC side to AC side, the diode was reduced and approximately 0.5% of efficiency was improved. Furthermore, up to 10% of input power factor in the low power output was improved because 2-pulse switching technique was introduced.

Free Research Field

パワーエレクトロニクス

Academic Significance and Societal Importance of the Research Achievements

部分スイッチング技術が導入された整流回路は、高力率・高効率・高調波低減を並立する回路方式であるが、単相回路にしか導入されていない。この技術は単相エアコンで実用化されているが、三相交流が利用される大容量のエアコンに対しては、部分スイッチングが導入された回路は未だに存在しない。そこで、本研究では部分スイッチング技術を三相整流回路に導入した。効率改善のための新たな回路構成と入力力率改善のための2パルススイッチング制御を導入し、その有効性を確認した。エアコンのみならず様々な三相整流回路に適用可能であると考えている。