電力系統安定化と非常時のマイクログリッド運用を目的とした特性非干渉型単相同期化力インバータの提案と実験的検証

抄録

A novel design of a single-phase synchronous inverter (SSI) having non-interference core dynamic performance is proposed, referred to as non-interference core SSI (NIC-SSI) in this paper. The proposed inverter consists of “core” and “shell. ” This novel design is advantageous for a flexible setting of the core controller to enhance power system stability, which is supported by the shell function for keeping robust synchronizing operation of inverters including microgrid operation. The novel points in this paper are summarized as: (1) the proposed controller enables SSIs to implement directly a desired dynamic characteristic such as a synchronous machine; (2) it can connect any single-phase systems as well as three-phase systems; (3) an islanded single-phase microgrid without rotating machines can be stabilized by multiple SSIs. The proposed controller make it possible to enhance system stability against increasing uncontrollable renewable energy sources and static power conversion devices. The developed SSI realizes flexible use in the demand side operations under normal/faulted grid conditions. Hardware-in-the-loop (HIL) testbed including the proposed digital controller and the real-time simulator validates the effectiveness of the proposed controller in the experimental conditions.