Multi-Port High Voltage Gain Modular Power Converter for Offshore Wind Farms

Sen Song, Yihua Hu, Kai Ni, Joseph Yan, Guipeng Chen, Huiqing Wen and Xianming Ye
Additional contact information
Sen Song: Department of Electrical Engineering and Electronics, The University of Liverpool, Liverpool L69 3BX, UK
Yihua Hu: Department of Electrical Engineering and Electronics, The University of Liverpool, Liverpool L69 3BX, UK
Kai Ni: Department of Electrical Engineering and Electronics, The University of Liverpool, Liverpool L69 3BX, UK
Joseph Yan: Department of Electrical Engineering and Electronics, The University of Liverpool, Liverpool L69 3BX, UK
Guipeng Chen: College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
Huiqing Wen: Department of Electrical Engineering and Electronics, Xi’an Jiaotong-Liverpool University, Suzhou 215123, China
Xianming Ye: Department of Electrical, Electronic and Computer Engineering, University of Pretoria, Pretoria 0084, South Africa

Sustainability, 2018, vol. 10, issue 7, 1-15

Abstract: In high voltage direct current (HVDC) power transmission of offshore wind power systems, DC/DC converters are applied to transfer power from wind generators to HVDC terminals, and they play a crucial role in providing a high voltage gain, high efficiency, and high fault tolerance. This paper introduces an innovative multi-port DC/DC converter with multiple modules connected in a scalable matrix configuration, presenting an ultra-high voltage step-up ratio and low voltage/current rating of components simultaneously. Additionally, thanks to the adoption of active clamping current-fed push–pull (CFPP) converters as sub-modules (SMs), soft-switching is obtained for all power switches, and the currents of series-connected CFPP converters are auto-balanced, which significantly reduce switching losses and control complexity. Furthermore, owing to the expandable matrix structure, the output voltage and power of a modular converter can be controlled by those of a single SM, or by adjusting the column and row numbers of the matrix. High control flexibility improves fault tolerance. Moreover, due to the flexible control, the proposed converter can transfer power directly from multiple ports to HVDC terminals without bus cable. In this paper, the design of the proposed converter is introduced, and its functions are illustrated by simulation results.

Keywords: high voltage direct current (HVDC); power transmission; DC/DC converter; high voltage gain; modular; multi-port (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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