Optical storage direct current coupling power control method, system and device and storage medium

By directly connecting to the DC side of the optical storage converter and controlling the charging and discharging of the energy storage equipment with the power difference, the problem of control delay of the energy storage DC converter is solved, and efficient and fast-responsive optical storage DC coupled power control is achieved, which improves the overall performance of the system and the life of the equipment.

CN119726883APending Publication Date: 2025-03-28QINGHAI HUANGHE HYDROPOWER DEVELOPMENT CO LTD
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Patent Information

Application Number
CN202311280717.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-09-28
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

In the existing optical storage DC coupling scheme, the control delay of the energy storage DC converter cannot instantaneously control the energy storage battery, resulting in the optical storage converter being unable to respond instantly, affecting the active support and adjustment effect, and the energy storage needs to be connected through the DC converter, resulting in a reduction in the battery charging and discharging efficiency.

Method used

By directly connecting the photovoltaic string and energy storage equipment to the DC side of the optical storage converter, the energy storage DC converter is cancelled, and the difference between the total power generation on the photovoltaic DC side and the power on the network of the optical storage converter, or the difference between the photovoltaic tracker voltage and the DC bus voltage is calculated, the charging and discharging of the energy storage equipment is indirectly controlled.

Benefits of technology

The rapid response and high-precision power control of the optical storage DC-coupled power generation unit are realized. After the energy storage DC converter is cancelled, the system conversion efficiency is high, and it can respond to system disturbances at the ms level, achieving enhanced active support and overall station adjustment capabilities, while preventing power sudden changes and protecting equipment and devices.

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Abstract

The invention discloses an optical storage direct current coupling power control method, system and device and a storage medium. A plurality of photovoltaic group strings are connected to the direct current side of a light storage converter through corresponding photovoltaic trackers, energy storage equipment is connected to the direct current side of the light storage converter, the alternating current side of the light storage converter is connected to a boosting transformer, and the energy storage equipment and the light storage converter are connected without passing through the direct current converter; and controlling the charging / discharging of the energy storage equipment by calculating the difference value between the total power generation power of the photovoltaic direct current side and the grid-connected power of the optical storage converter. The light-storage direct-current coupling power generation unit has the advantages of high equipment integration level, common boosting transformer, high system conversion efficiency, quick light-storage cooperative control response, high power control precision and the like, can naturally respond to system change when the system is disturbed, can instantly respond to realize active support, and has high reliability. And meanwhile, response synchronization and balanced contribution of all the light storage direct current coupling power generation units in one photovoltaic power station can be realized, and the regulation capability of the whole station is enhanced.
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