RESEARCH ON ACTIVE FREQUENCY SUPPORT FOR GRID-FORMING FLEXIBLE DIRECT RECEIVING END CONVERTER STATION BASED ON MODEL PREDICTIVE CONTROL

Sun Chengzhang; Ren Yongfeng; Yun Pingping; Mi Yue; Fang Chenzhi; He Bin

doi:10.19912/j.0254-0096.tynxb.2024-0251

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (6) : 401-409. DOI: 10.19912/j.0254-0096.tynxb.2024-0251

RESEARCH ON ACTIVE FREQUENCY SUPPORT FOR GRID-FORMING FLEXIBLE DIRECT RECEIVING END CONVERTER STATION BASED ON MODEL PREDICTIVE CONTROL

Sun Chengzhang¹, Ren Yongfeng¹, Yun Pingping², Mi Yue², Fang Chenzhi¹, He Bin¹

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Abstract

This paper addresses the issue of insufficient active frequency support and regulation capabilities at the receiving converter stations of flexible direct current transmission systems. A control strategy based on model predictive control （MPC） for grid-forming modular multilevel converters （MMC） is proposed. Firstly, the paper introduces the principle of frequency support for grid-forming MMCs. Subsequently, the MPC algorithm is integrated into the traditional droop control to overcome the inherent limitations of secondary frequency regulation in conventional droop control. This control method generates real-time optimal control functions that indirectly enable the dynamic adjustment of the droop coefficient, thus allowing the system frequency to stably track the setpoint and achieve the effect of secondary frequency regulation. Finally, time-domain simulations conducted on the Matlab/Simulink software platform validate the feasibility and effectiveness of the proposed control strategy.

Key words

power electronics / model predictive control / HVDC power transmission / virtual synchronous generator VSG / secondary frequency modulation

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Sun Chengzhang, Ren Yongfeng, Yun Pingping, Mi Yue, Fang Chenzhi, He Bin. RESEARCH ON ACTIVE FREQUENCY SUPPORT FOR GRID-FORMING FLEXIBLE DIRECT RECEIVING END CONVERTER STATION BASED ON MODEL PREDICTIVE CONTROL[J]. Acta Energiae Solaris Sinica. 2025, 46(6): 401-409 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0251

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