DRU‐HVDC for offshore wind power transmission: A review

Author:

Yu Lujie12ORCID,Fu Ziyu1ORCID,Li Rui3ORCID,Zhu Jiebei1ORCID

Affiliation:

1. School of Electrical and Information Engineering Tianjin University Tianjin China

2. Georgia Tech Shenzhen Institute Tianjin University Shenzhen China

3. School of Electrical Engineering and Automation Harbin Institute of Technology Harbin China

Abstract

AbstractThe 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 PV and Qf 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.

Funder

National Natural Science Foundation of China

Publisher

Institution of Engineering and Technology (IET)

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