Improvement of Frequency Support for a DFIG Using a Virtual Synchronous Generator Strategy at Large Power Angles

Zhishuai Hu, Yongfeng Ren (), Qingtian Meng, Pingping Yun, Chenzhi Fang and Yu Pan
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Zhishuai Hu: College of Energy and Power Engineering, Inner Mongolia University of Technology, Hohhot 010051, China
Yongfeng Ren: College of Energy and Power Engineering, Inner Mongolia University of Technology, Hohhot 010051, China
Qingtian Meng: College of Energy and Power Engineering, Inner Mongolia University of Technology, Hohhot 010051, China
Pingping Yun: Inner Mongolia Guotian New Energy Technology Co., Ltd., Hohhot 010051, China
Chenzhi Fang: College of Energy and Power Engineering, Inner Mongolia University of Technology, Hohhot 010051, China
Yu Pan: College of Energy and Power Engineering, Inner Mongolia University of Technology, Hohhot 010051, China

Energies, 2023, vol. 16, issue 2, 1-20

Abstract: The frequency regulation rate and operation stability of a doubly fed induction generator (DFIG) based on a virtual synchronous generator (VSG) strategy decreases under large-power-angle conditions, which reduces the grid frequency support capacity. This paper proposes the compound adaptive parameter (CAP) and coordinated primary frequency regulation (CPFR) strategies to improve the grid frequency support capacity in terms of multiple dimensions of the transient properties, operation condition range, and regulation duration. Mathematical and small signal models of the DFIG-VSG system are constructed. The effect of large-power-angle conditions on the transient properties under grid frequency perturbations is analyzed based on these models, and the CAP strategy for excitation control and virtual damping is formulated. The constraints of the rotor kinetic energy and the load increase capacity of the grid-side converter are analyzed, and the CPFR strategy is formulated based on this. Finally, the effectiveness of the proposed strategies is verified via simulations of single-machine and wind farm scenarios under grid frequency perturbation.

Keywords: primary frequency regulation (PFR); doubly fed induction generator (DFIG); virtual synchronous generator (VSG); large power angle; adaptive parameter strategy; energy storage system (ESS) (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: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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