Analysis and indexing of transient stability contribution characteristics of the power system required for advanced grid-connected inverters

2020 Fiscal Year Final Research Report

• Project/Area Number: 19K23521
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Multi-year Fund
• Review Section: 0302:Electrical and electronic engineering and related fields
• Research Institution: Toyo University
• Principal Investigator: Hirase Yuko 東洋大学, 理工学部, 准教授 (50843778)
• Project Period (FY): 2019-08-30 – 2021-03-31
• Keywords: 慣性力 / 分散電源 / インバータ連系 / 指標

Outline of Final Research Achievements

A simulation model for MATLAB/Simulink of grid-connected inverter and battery were created. The inverter equipped a control method called "virtual synchronous generator (VSG) control", which is a control method that simulates the swing equation of a synchronous generator on a program. The storage battery was used to mimic the inertial energy of the inverter. The large-scaled system consists of the above model was created to investigated the system frequency behavior when load/generated power fluctuations occur. In addition, for the purpose of indexing the parameters that determine the characteristics of the distributed power sources required for system stabilization, detailed analysis of various torques of each power supply, and the correlation between time, center of inertial frequency, and control parameters was visualized. IEEE 9 bus model was used.

Free Research Field

パワーエレクトロニックシステム

Academic Significance and Societal Importance of the Research Achievements

電力系統にインバータ連系される静止形の分散電源が大量導入されると、慣性力をもつ回転形の同期発電機の比率が相対的に減り、系統全体の安定度が低下する。この事実は、分散電源に利用される再生可能エネルギーの利用を妨げるため、再エネ電源の普及と電力の安定かつ安全な供給を両立しなくてはいけない。
さらに、インバータ電源の制御変数や機器定数はメーカ開示されないことや、天候や時間に左右される再エネ電源が接続と解列を任意に行うことで系統の状態が常に変化することなども、再エネ電源の普及を妨げている。
本研究成果のインバータ挙動の指標を基に、系統事業者が連系インバータに必要十分な要求を制定することが可能になる。