Coordinated Control Strategies for Enhancing Frequency Stability of Photovoltaic and Storage Networking Systems

• Published in: Dianli jianshe Vol. 46; no. 8; pp. 138 - 149
• Main Author: JIANG Shouqi, ZHANG Haifeng, FU Gui, XIN Yechun, WANG Lixin
• Format: Journal Article
• Language: Chinese
• Published: Editorial Department of Electric Power Construction 01.08.2025
• Subjects: photovoltaic and energy storage grid-connected system|self-synchronization|inertia support|primary frequency regulation|frequency stability
• ISSN: 1000-7229
• DOI: 10.12204/j.issn.1000-7229.2025.08.013

[Objective] To cope with the frequency stability problems caused by the low inertia and weak damping of new power systems with an increasing proportion of new energy installations and to ensure the stable operation of the power system，a coordinated control strategy for the active frequency support of a photovoltaic storage grid-connected system with the participation of multiple subjects is proposed to meet the frequency regulation requirements under different operating conditions of the photovoltaic systems configured with energy storage. [Methods] The proposed method analyzes the frequency regulation demand of the system under different operating conditions according to the power regulation margin and unbalanced power of the synchronous machine and designs a self-synchronous control strategy for the grid-connected inverter that transmits the frequency change information while proactively supporting inertia. It proposes a multi-timescale frequency regulation control strategy for a photovoltaic storage system