A Steady-State Analysis Method for Modular Multilevel Converters Connected to Permanent Magnet Synchronous Generator-Based Wind Energy Conversion Systems

Zhijie Liu, Kejun Li, Yuanyuan Sun, Jinyu Wang, Zhuodi Wang, Kaiqi Sun and Meiyan Wang
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Zhijie Liu: School of Electrical Engineering, Shandong University, Shandong 250061, China
Kejun Li: School of Electrical Engineering, Shandong University, Shandong 250061, China
Yuanyuan Sun: School of Electrical Engineering, Shandong University, Shandong 250061, China
Jinyu Wang: School of Electrical and Electronics Engineering, Nanyang Technological University, Singapore 639798, Singapore
Zhuodi Wang: School of Electrical Engineering, Shandong University, Shandong 250061, China
Kaiqi Sun: School of Electrical Engineering, Shandong University, Shandong 250061, China
Meiyan Wang: School of Electrical Engineering, Shandong University, Shandong 250061, China

Energies, 2018, vol. 11, issue 2, 1-31

Abstract: Modular multilevel converters (MMCs) have shown great potential in the area of multi-megawatt wind energy conversion system (WECS) based on permanent magnet synchronous generators (PMSGs). However, the studies in this area are few, and most of them refer to the MMC used in high-voltage direct current (HVDC) systems, and hence the characteristics of the PMSG are not considered. This paper proposes a steady-state analysis method for MMCs connected to a PMSG-based WECS. In the proposed method, only the wind speed (operating condition) is required as input, and all the electrical quantities in the MMC, including the amplitudes, phase angles and their harmonics, can be calculated step by step. The analysis method is built on the proposed d-q frame mathematical model. Interactions of electrical quantities between the MMC and PMSG are comprehensively considered. Moreover, a new way to calculate the average switching functions are adopted in order to improve the accuracy of the analysis method. Applications of the proposed method are also presented, which includes the characteristic analysis of capacitor voltage ripples and the capacitor sizing. Finally, the accuracy of the method and the correctness of the analysis are verified by simulations and experiments.

Keywords: steady-state analysis; modular multilevel converter; permanent magnet synchronous generator; wind energy conversion system; mathematical model (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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