Fault cooperative control and ride-through method and system of optical storage DC flexible system

By real-time monitoring and dynamic coordination of control strategies for photovoltaic, energy storage and grid-connected converters, the smooth transition and energy optimization problems of photovoltaic-storage-DC-flexible systems under grid faults are solved, achieving stable operation and rapid recovery under fault scenarios, and improving the power supply reliability and resilience of the system.

CN122118644APending Publication Date: 2026-05-29DONGYING POWER SUPPLY COMPANY STATE GRID SHANDONG ELECTRIC POWER +1
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Patent Information

Application Number
CN202610103379.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-01-26
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

When facing grid faults, existing technologies struggle to achieve smooth transitions and optimized energy management in photovoltaic-storage-DC-flexible systems, leading to DC bus voltage fluctuations, equipment overcurrent, and system instability, which threaten power supply security and equipment lifespan.

Method used

By monitoring the system's operating status in real time, identifying fault types, and dynamically coordinating the control strategies of photovoltaic, energy storage, and grid-connected converters, optimal power flow management and rapid system recovery under different fault scenarios can be achieved, including switching the photovoltaic port mode in grid-connected mode and suppressing fault current for physical isolation in off-grid mode.

Benefits of technology

It has enabled the photovoltaic-storage DC-flexible system to operate smoothly under fault conditions, ensuring stable DC bus voltage and equipment safety, achieving rapid system recovery and optimal power flow management, and improving power supply reliability and system resilience.

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Abstract

The invention discloses a fault cooperative control and ride-through method and system for an optical storage direct-flexible system. The method comprises the following steps: acquiring operation state data of the optical storage direct-flexible system; according to the obtained data, whether the system breaks down or not is judged, and the fault type is determined; when it is judged that the system has an alternating-current power grid fault in the grid-connected operation mode, switching the photovoltaic port from the maximum power point tracking mode to a constant-voltage mode, calculating a voltage deviation between a direct-current bus voltage rated value and the direct-current bus voltage according to the operation state data of the system, and performing mode switching on the energy storage port according to the voltage deviation, updating an active power reference value of the grid-connected converter according to the scheduling instruction; and when it is judged that the system has the direct current side short circuit fault in the off-grid mode, the fault current is suppressed, and the fault point is physically isolated. And optimal power flow management and rapid system recovery under different fault scenes are realized on the premise of ensuring the voltage stability of the direct current bus and the safety of equipment.
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