Power supporting system with energy storage system

The power supporting system addresses the complexity and cost issues of integrating energy storage with STATCOMs by switching between modes using a voltage source converter and energy storage, enhancing reliability and reducing maintenance through improved switching logic and a protection circuit.

WO2026104397A1PCT designated stage Publication Date: 2026-05-21HITACHI ENERGY LTD
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
HITACHI ENERGY LTD
Filing Date
2025-11-11
Publication Date
2026-05-21

AI Technical Summary

Technical Problem

The integration of energy storage systems with STATCOMs increases costs and complexity, leading to reliability issues due to the need for sophisticated control systems and potential component failures, especially when managing both reactive and active power simultaneously.

Method used

A power supporting system that can switch between modes using a voltage source converter and an energy storage system, with enhanced switching logic to handle normal and emergent behavior, including the use of a protection circuit to discharge energy during emergent switching, thereby improving reliability and reducing maintenance time.

Benefits of technology

Enhances switching reliability, simplifies calibration, and reduces maintenance time by predicting and addressing unexpected switching behaviors, thus ensuring stable power support.

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    Figure EP2025082596_21052026_PF_FP_ABST
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Abstract

The present disclosure relates to a method of controlling a power supporting system (1) for a power transmission or distribution system, said power supporting system (1) being controllable to: a first power supporting mode (S8) in which said power supporting system (1) is capable of providing active power support and reactive power support, said active power support being provided by means of an energy storage system (20), ESS, having been charged to an energized state, and said reactive power support being provided by means of a voltage source converter (10), VSC, and a second power supporting mode (S5) in which said power supporting system (1) is capable of providing reactive power support by means of said VSC (10), and in which said ESS (10) is in a de-energized state, the method comprising: determining if said power supporting system (1) is operating with normal switching behavior or with emergent switching behavior; during normal switching behavior, controlling the power supporting system (1) so that, when switching mode from said first power supporting mode (S8) to said second power supporting mode (S5), said ESS (20) is discharged by means of operating at least one switch of the VSC (10), and in response to a detection of emergent switching behavior, controlling the power supporting system (1) so that, when switching mode from said first power supporting mode (S8) to said second power supporting mode (S5), said ESS (20) is discharged by means of a protection circuit (40) configured to consume energy of the ESS (20). A control device (30) and a power supporting system (1) is also disclosed.
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