A Comprehensive VSM Control Strategy Designed for Unbalanced Grids

Huiyu Miao, Fei Mei, Yun Yang, Hongfei Chen and Jianyong Zheng
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Huiyu Miao: School of Electrical Engineering, Southeast University, Nanjing 210096, China
Fei Mei: College of Energy and Electrical Engineering, Hohai University, Nanjing 210098, China
Yun Yang: School of Electrical Engineering, Southeast University, Nanjing 210096, China
Hongfei Chen: School of Electrical Engineering, Southeast University, Nanjing 210096, China
Jianyong Zheng: School of Electrical Engineering, Southeast University, Nanjing 210096, China

Energies, 2019, vol. 12, issue 6, 1-17

Abstract: A virtual synchronous machine (VSM) is a converter which, compared to other types of converters, has more friendly interactions with the power grid because it is able to simulate the external characteristics of a synchronous machine, which can provide virtual inertia and damping. When the grid voltage is unbalanced, there will be negative sequence current and power oscillations. There will also be double-frequency ripples on the DC bus, which affect the normal operation of the DC power source or load. In order to solve these problems, a comprehensive control strategy is proposed in this paper. The principle of a VSM operated as a current source converter, also called VISMA, is used in the design. A complex coefficient filter is applied to separate the positive and negative sequence components of the grid voltage. By analyzing the reasons of power oscillations under unbalanced voltage, the electrical simulation part of the VSM is improved to achieve several objectives: to suppress negative sequence current and DC voltage ripples. Additionally, the rated voltage in the reactive control part is adaptively adjusted to stabilize the system. The validity of the proposed control strategy is verified by simulation and experiment.

Keywords: VSM; three-phase unbalanced; negative sequence; voltage ripple (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: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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