Design of PV MVDC Converter with Wide Output Voltage Range for Series DC System

Huan Wang, Junlong Lu, Xinke Huang, Yibo Wang and Honghua Xu
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Huan Wang: Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China
Junlong Lu: Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China
Xinke Huang: Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China
Yibo Wang: Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China
Honghua Xu: Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, China

Energies, 2021, vol. 14, issue 6, 1-25

Abstract: This paper presents a topology of PV MVDC converter with wide output voltage range for a series DC system and its control strategy. In the series DC system, the PV MVDC converters are input-independent, and their outputs are series-connected. A high-level system voltage is achieved for power collection and transmission. This series boost system is flexible and very suitable for decentralized renewable energy application. A modular topology is present for the MVDC converter to improve its applicability. A reconfigurable topology and its modulation method are proposed for the module of the converter. By regulating of duty cycle of switches, the module can be reconfigured to step-up or step-down mode. The operating principles and theoretical derivations of the reconfigurable topology are discussed in detail in this paper. Multimode control strategy for the converter is designed to adapt to complex operation conditions in a series DC system. With the proposed topology and control strategy, the series-connected PV MVDC converter achieves wide input and output voltage range to adapt to the operating characteristics of the series DC system; 3 kV/80 kW DC–DC module and 20 kV/500 kW PV MVDC converter are developed and operating stably in practice. The operation results are presented in the paper.

Keywords: PV; series; MVDC; converter (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: 2021
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