An Electromagnetic Var Compensator Suitable for Wind Power Access and Its Control Strategy

Xiangwu Yan, Yan Guo, Jiaoxin Jia, Waseem Aslam, Bingbao Qi, Yang Wang and Xiaolin Xu
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Xiangwu Yan: Key Laboratory of Distributed Energy Storage, Micro-Grid of Hebei Province, North China Electric Power University, No. 619 Yonghua Road, Baoding 071003, China
Yan Guo: Key Laboratory of Distributed Energy Storage, Micro-Grid of Hebei Province, North China Electric Power University, No. 619 Yonghua Road, Baoding 071003, China
Jiaoxin Jia: Key Laboratory of Distributed Energy Storage, Micro-Grid of Hebei Province, North China Electric Power University, No. 619 Yonghua Road, Baoding 071003, China
Waseem Aslam: Department of Electrical Engineering, University of Sargodha, Sargodha 40100, Pakistan
Bingbao Qi: Key Laboratory of Distributed Energy Storage, Micro-Grid of Hebei Province, North China Electric Power University, No. 619 Yonghua Road, Baoding 071003, China
Yang Wang: Key Laboratory of Distributed Energy Storage, Micro-Grid of Hebei Province, North China Electric Power University, No. 619 Yonghua Road, Baoding 071003, China
Xiaolin Xu: Key Laboratory of Distributed Energy Storage, Micro-Grid of Hebei Province, North China Electric Power University, No. 619 Yonghua Road, Baoding 071003, China

Energies, 2022, vol. 15, issue 15, 1-15

Abstract: As the proportion of large-scale wind farms and distributed wind power connected to the power grid increases annually, the effects of their intermittent and random characteristics on the active and reactive power fluctuations of the power grid are becoming increasingly evident, causing frequent voltage fluctuations at the grid-connected point. To solve these problems, this study proposes a new topology of an electromagnetic var compensator (EVC) based on a rotary phase-shifting transformer (RPST). The EVC can work under capacitive and inductive conditions to compensate for inductive and capacitive power, respectively. In accordance with the parallel steady-state mathematical model of the EVC, a double closed-loop control strategy with high precision and considerable robustness is proposed for the EVC on the basis of instantaneous reactive power theory. Finally, simulations show that the topology of the proposed EVC exhibits bidirectional and continuous adjustment capability that can meet the reactive power compensation requirements of power systems with a high percentage of wind power. Compared with the existing reactive power compensation device, the EVC exhibits the advantages of high voltage, large capacity, low cost, strong impact resistance, and good tolerance, imbuing it with great prospects for development.

Keywords: grid-connected wind power; reactive power compensation; control strategy; rotary phase shift transformer (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: 2022
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