100%インバータベース電源・蓄電池システムに向けた電力系統の保護課題と解決策

Unofficial AI-generated summary based on the public title and abstract. Not an official translation.

🔬研究者:高インバータ比率系統における保護協調・故障電流特性の研究動向を体系的に把握できる。

🏢実務担当者:再エネ・蓄電池・HVDC導入時の保護リレー設定見直しや系統連系リスク評価の参考になる。

🏛政策担当者:再エネ大量導入政策の実現には系統保護・安定性への技術投資が不可欠である点を示唆する。

The decarbonization of the energy sector, driven by the Paris Agreement and the European Green Deal, is increasing the share of renewable energy sources (RES) in power systems. Unlike traditional systems, RES-based systems rely on power electronic converters, which creates unprecedented challenges for reliability and resilience. The future power system is expected to combine a low-level AC layer with an upper-level High Voltage Direct Current (HVDC) backbone, which requires new understanding of fault protection, stability, and interaction between AC and DC components, as well as new models and simulation tools. This is especially critical in systems moving towards 100 percent converter-based generation. Protection systems detect, locate, and isolate faults to protect assets while the rest of the system keeps operating. Traditionally, they rely on the large fault currents supplied by synchronous machines. In modern systems, converter controls limit the fault current contribution to about 120 percent of rated current, so relays that distinguish faults from normal overcurrents based on current level may operate incorrectly. In addition, inverter-based resources (IBR) may not inject enough negative and zero sequence current for directional relays to work properly, and converters hold the voltage at a fixed value only within their reach, beyond which it drops quickly. As a result, existing protection schemes may not provide the expected accuracy and reliability. This report reviews the protection challenges identified in recent academic literature for power systems with high shares of converter-based resources. It covers the specific characteristics of RES, the challenges for protection with intelligent electronic devices (IED), the challenges of converter control during faults, and the main solutions proposed in research over the last decade.

• arXiv https://arxiv.org/abs/2611.02696first seen 2026-11-04 04:11:14