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| Primary frequency regulation coordination control strategy of a wind power all-DC transmission system based on variable droop coefficient |
| DOI：10.19783/j.cnki.pspc.230948 |
| Key Words:all-DC transmission system primary frequency regulation variable droop control virtual synchronous generator de-loading control coordinated control |
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| Abstract:In the wind power all-DC transmission system of wind farm DC collection-DC transmission, the existence of the DC system will decouple the frequency connection between the wind farm and the power grid, and the frequency support ability is weak using the traditional control strategy. Therefore, a primary frequency regulation coordinated control strategy of a wind power all-DC transmission system based on variable droop is proposed. First, a voltage-frequency variable droop frequency transfer strategy based on the Logistic function is proposed, and the coupling relationship between the power grid frequency and the wind farm power is established with the DC system voltage as the medium. Based on this strategy, a primary frequency regulation coordinated control strategy of the wind power all-DC transmission system is contructed. It consists of variable droop virtual synchronous generator (VSG) control of the receiving converter station, the improved double closed-loop control of the DC booster station and the variable droop de-loading control of the wind turbine. This can realize system frequency transmission without communication and participate in power grid primary frequency regulation. Finally, Matlab/Simulink is used to build a simulation model of the system, and simulation verification is carried out in various working conditions. The simulation results show that the proposed control strategy enables the wind farm to achieve primary frequency regulation of the power grid without relying on remote communication, and effectively reduces the fluctuation amplitude of DC voltage in the process of frequency regulation. |
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