Distributed new energy off-grid power supply system and starting method thereof

By sorting the new energy power generation modules of the distributed new energy off-grid power supply system and using the surge current suppression device for off-grid smooth start, the disturbance problem of the excitation surge current on the system during startup is solved, and the stable and safe operation of the system is achieved.

CN119726965APending Publication Date: 2025-03-28DAANJI ELECTRIC GREEN HYDROGEN ENERGY CO LTD +2
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Patent Information

Application Number
CN202411880173.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-19
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

The excitation surge current of the distributed new energy off-grid power supply system at startup causes disturbance to the weak grid, which may cause the system to collapse and fail to operate normally.

Method used

By sorting all new energy power generation modules, and using inrush current suppression device to magnetize the transformer's primary winding when each module starts power supply, the no-load voltage is monitored in real time, and when the preset conditions are met, the new energy power generation module is connected to the power supply busbar to achieve off-grid smooth start.

Benefits of technology

It effectively suppresses the excitation surge current when the distributed new energy off-grid power supply system is started, ensures the stability and safety of the system, and ensures normal operation.

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Abstract

The invention discloses a distributed new energy off-grid power supply system and a starting method thereof. The distributed new energy off-grid power supply system comprises a power supply bus, a plurality of power supply branches connected with the power supply bus in parallel and an inrush current suppression device, each power supply branch comprises a new energy power generation module, a first circuit breaker and a transformer which are connected in sequence, and the inrush current suppression device is connected with the first circuit breaker in each power supply branch in parallel. All new energy power generation modules are sequenced, all the new energy power generation modules are sequentially controlled to start power supply according to the sequence until all the new energy power generation modules complete power supply starting, and when each new energy power generation module starts power supply, a primary winding of a corresponding transformer is magnetized through an inrush current suppression device; and the no-load voltage of the transformer is monitored in real time, and when the no-load voltage meets a preset condition, the new energy power generation module is connected to the power supply bus, so that the power supply branch where the new energy power generation module is located completes off-grid smooth start power supply.
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