RESEARCH ON FAULT RIDE-THROUGH CONTROL STRATEGY OF GRID-FORMING TYPE CONVERTER FOR OFFSHORE WIND FARMS BASED ON DRU

Cheng Zhijiang; Li Shuai; Yang Tianxiang; Aisikaer; Fang Zhong; Gao Yucheng

doi:10.19912/j.0254-0096.tynxb.2023-1414

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (1) : 140-150. DOI: 10.19912/j.0254-0096.tynxb.2023-1414

RESEARCH ON FAULT RIDE-THROUGH CONTROL STRATEGY OF GRID-FORMING TYPE CONVERTER FOR OFFSHORE WIND FARMS BASED ON DRU

Cheng Zhijiang¹, Li Shuai¹, Yang Tianxiang¹, Aisikaer², Fang Zhong², Gao Yucheng²

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Abstract

Based on grid-forming wind farm and Diode Rectifier Units （DRU） is currently a hot topic in the development of offshore wind power.During faults on the offshore AC collection side, the rapid response of the offshore wind power system and the quick absorption of redundance power are key technologies to ensure the reliable operation of the system. In response to the issues of immature fault identification and incomplete fault coverage in existing fault ride-through control strategies, this paper proposes an adaptive control strategy that determines faults through voltage error, analyzing faults at multiple locations in the offshore AC collection area （including individual machine faults and common cable faults）. In response to the issues of immature fault identification and incomplete fault coverage in existing fault ride-through control strategies, this paper proposes an adaptive control strategy that determines faults through voltage error, analyzing faults at multiple locations in the offshore AC collection side （including individual machine faults and common cable faults）. By utilizing a combination of energy-dissipating resistors on the DC side and adaptive control, the fault ride-through scheme allows non-faulted wind turbines to operate without disconnecting from the grid during faults and to quickly recover power transmission.The simulation experiments were built on the RT-LAB hardware-in-the-loop simulation platform. The simulation results show that this scheme can achieve fault ride-through under both symmetrical and asymmetrical faults, improving the reliability of the wind power generation system.

Key words

offshore wind farms / phase control / adaptive modulation / low-frequency alternating current transmission / diode rectifier unit / fault ride-through

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Cheng Zhijiang, Li Shuai, Yang Tianxiang, Aisikaer, Fang Zhong, Gao Yucheng. RESEARCH ON FAULT RIDE-THROUGH CONTROL STRATEGY OF GRID-FORMING TYPE CONVERTER FOR OFFSHORE WIND FARMS BASED ON DRU[J]. Acta Energiae Solaris Sinica. 2025, 46(1): 140-150 https://doi.org/10.19912/j.0254-0096.tynxb.2023-1414

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