Medium Frequency Diode Rectifier Unit Based HVDC Transmission for Offshore Wind Farm Integration

doi:10.11930/j.issn.1004-9649.202005085

Abstract

Abstract: The offshore wind farms are the main trend of the wind power development in the future. Till now, the commissioned far offshore wind farms are always connected to the onshore AC system by VSC-HVDC systems. The hybrid HVDC topology with uncontrolled diode rectifier unit (DRU) has drawn attentions from both the academia and the industry, due to its economic benefits. In order to further improve the economic efficiency of far offshore wind power transmission systems, this paper proposed the medium frequency uncontrolled rectifier offshore wind power transmission system based on the DRU at the rectifier side. The offshore ac system rated frequency of the proposed system is set as 100~400 Hz, which could significantly decrease the weight and the volume of the transformer and the AC filters at the offshore platform. The corresponding control scheme of the wind turbine are also proposed, where the machine side converter controls the DC voltage and the grid side converter controls the machine power and the AC side voltage together in the global unified reference coordinate system. Based on time domain simulations in PSCAD/EMTDC, the feasibility of the proposed schemes is verified.

Key words: offshore wind farm, medium frequency wind farm, grid forming converter, diode rectifier unit (DRU), global unified reference coordinate system

ZHANG Zheren, TANG Yingjie, XU Zheng. Medium Frequency Diode Rectifier Unit Based HVDC Transmission for Offshore Wind Farm Integration[J]. Electric Power, 2020, 53(7): 80-91.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202005085

https://www.electricpower.com.cn/EN/Y2020/V53/I7/80

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