Development of Electrolytic Capacitor-less Single-phase Grid-connected Inverter for High Power Density

2018 Fiscal Year Final Research Report

• Project/Area Number: 16K06213
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Power engineering/Power conversion/Electric machinery
• Research Institution: Nagaoka University of Technology
• Principal Investigator: Haga Hitoshi 長岡技術科学大学, 工学研究科, 准教授 (10469570)
• Project Period (FY): 2016-04-01 – 2019-03-31
• Keywords: パワーエレクトロニクス / 電解コンデンサレス

Outline of Final Research Achievements

This study developed and verified a control method to perform single-phase power pulsation compensation using the proposed T-type NPC inverter. As a result, it was confirmed from the experimental verification that the pulsation component of the DC link can be reduced when performing single-phase pulsation compensation with the same capacitor capacity as compared with the control method that does not perform single-phase pulsation compensation. It has been confirmed that the doubled component of the power supply frequency generated in the DC link can be reduced by 65% as compared with the conventional control method. The conversion efficiency by the experimental apparatus was 85% at about 400 W output. The results of this research have revealed that the proposed system and the proposed control method are effective in reducing the size and weight and prolonging the life of the grid-connected inverter device using photovoltaic power generation.

Free Research Field

パワーエレクトロニクス

Academic Significance and Societal Importance of the Research Achievements

省エネルギー、省資源の観点から、太陽光発電システムの普及は重要である。本研究では、太陽光発電に用いられるパワーコンディショナを想定したシステムの省エネルギー、省資源を実現する電力変換技術を開発した。本研究の遂行により、提案技術が装置の省資源化に有効であることを明らかにしているため、学術的意義および社会的意義は大いにある。