Study on Solid State Transformer with Virtual Synchronous Machine Control

2021 Fiscal Year Final Research Report

• Project/Area Number: 19H02131
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 21010:Power engineering-related
• Research Institution: Nagaoka University of Technology
• Principal Investigator: Yushi MIURA 長岡技術科学大学, 工学研究科, 教授 (90354646)
• Co-Investigator(Kenkyū-buntansha): 劉 佳 大阪大学, 工学研究科, 助教 (00791922)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: SST / 半導体変圧器 / 仮想同期機制御 / 疑似慣性動作 / 電力貯蔵装置

Outline of Final Research Achievements

For a solid-state transformer (SST) with an electric storage system (ESS) that applies virtual synchronous machine (VSM) control to support power system inertia (VSM-SST), The requirements for the VSM-SST to compensate the inertia is first clarified. Then, a control system was constructed in which the ESS does not always operate, but only when a power fluctuation occurs, the power fluctuation is detected using the change in damping power, which is an internal variable of the VSM control, and the ESS is operated. In the case that the ESS is disconnected from the VSM-SST due to overcharging or other reasons, it is able to continue to supply power to the load in the same way as a conventional SST by changing the VSM control variables. The effectiveness of the proposed control method was verified by experiments with a simplified VSM-SST of 1 kW class.

Free Research Field

パワーエレクトロニクス

Academic Significance and Societal Importance of the Research Achievements

提案する仮想同期機（VSM）制御を適用した半導体変圧器（SST）によって，電力系統の慣性不足の問題が解決され再エネ電源の大量導入が可能となる。またVSM制御導入時のパラメータ設定・コスト負担などの実用上の課題を解決できる。本研究では，VSM-SSTに必要な慣性補償動作を明らかにし，電力貯蔵装置がSSTと協調して動作する制御を提案し，その有効性を示すことによりVSM-SSTの開発に貢献している。