Coordinate Control and Fautl Ride Through Strategies for Multi-Terminal Dc Grid With Offshore Wind Farm Integration Based on Diode Rectifier

Xie, Lei; Liangzhong, Yao; He, Guodong; Li, Y.; Fan, Yuchen

doi:10.1049/icp.2021.2371

IET Conf. Proc.

2021

DOI: 10.1049/icp.2021.2371

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Coordinate Control and Fautl Ride Through Strategies for Multi-Terminal Dc Grid With Offshore Wind Farm Integration Based on Diode Rectifier

Lei Xie¹,

Yao Liangzhong²,

Guodong He³

et al.

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DRU‐HVDC for offshore wind power transmission: A review

Yu,

Fu,

et al. 2024

IET Renewable Power Gen

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The rapid development of offshore wind farms (OWFs) calls for economical and reliable power transmission technology. This review paper focuses on the diode‐rectifier‐unit based high voltage direct current (DRU‐HVDC) transmission systems. The main technical features of DRU‐HVDC are highlighted and the comparisons with MMC‐HVDC and LCC‐HVDC are conducted. Considering the uncontrollability of DRU and the necessity of offshore wind turbines (WTs) to establish offshore network, the existing decentralized and centralized control strategies are reviewed in detail. For the fully‐grid‐forming converter, the operation principle of the P–V and Q–f power control is explained from the OWF‐DRU level and the WT level, respectively. For the partial‐grid‐forming converter, why the voltage control loop can be eliminated is analysed. Focusing on the start‐up issue caused by the unidirectional‐power‐flow characteristic of DRU, several start‐up solutions are reviewed, including medium voltage alternative current (MVAC) umbilical cable, auxiliary MMC, energy storage for WTs, auxiliary low voltage DC cable. Then considering different fault locations, the fault characteristic and protection of the DRU‐HVDC system is presented, including the offshore AC faults, DRU faults, HVDC faults and onshore AC faults. Finally, the future research topics worth exploring for DRU‐HVDC system are identified.

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DRU‐HVDC for offshore wind power transmission: A review

Yu,

Fu,

et al. 2024

IET Renewable Power Gen

View full text Add to dashboard Cite

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Advanced Local Grid Control System for Offshore Wind Turbines with the Diode-Based Rectifier HVDC Link Implemented in a True Scalable Test Bench

et al. 2022

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Diode-based HVDC link technology is considered an alternative to reduce the cost and complexity of offshore HVDC platforms. When this technology is used, the AC grid of the wind farm must be created artificially. This paper proposes an advanced frequency control method that permits forming an AC grid voltage system to connect offshore wind turbines to a diode-based HVDC link rectifier. The proposed algorithm can be easily implemented in the wind farm’s overall Power Plant Controller (PPC) without any change in the commercial wind turbine firmware. All wind turbines receive reactive power targets from the PPC to maintain the frequency and amplitude of the offshore AC line, delivering the maximum active power generated by the wind. A novel black start method is proposed to establish the wind farm’s local AC grid voltage system. The control method has been implemented and proved in an experimental setting. The black start has been successfully verified, and the frequency control algorithm shows excellent experimental results.

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Coordinate Control and Fautl Ride Through Strategies for Multi-Terminal Dc Grid With Offshore Wind Farm Integration Based on Diode Rectifier

Cited by 2 publications

References 0 publications

DRU‐HVDC for offshore wind power transmission: A review

DRU‐HVDC for offshore wind power transmission: A review

Advanced Local Grid Control System for Offshore Wind Turbines with the Diode-Based Rectifier HVDC Link Implemented in a True Scalable Test Bench

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