Analysis of Frequency Regulation Capability of Doubly Fed Induction Generator and Supercapacitor Energy Storage Based on Dynamic Power Flow

Tingting Sun, Hongru Shi, Lei Ren and Jiejie Huang ()
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Tingting Sun: School of Electrical and Energy Engineering, Nantong Institute of Technology, Nantong 226002, China
Hongru Shi: School of Electrical and Energy Engineering, Nantong Institute of Technology, Nantong 226002, China
Lei Ren: School of Electrical Engineering, Nantong University, Nantong 226019, China
Jiejie Huang: School of Electrical Engineering, Nantong University, Nantong 226019, China

Energies, 2023, vol. 16, issue 20, 1-17

Abstract: The grid-integrated doubly fed induction generator (DFIG) is required to participate in the frequency regulation of the power system. The supercapacitor energy storage (SES) is capable of enhancing the frequency regulation capability of the DFIG in a coupled manner. The SES is connected to the DC capacitor of the DFIG and provides active power response through the droop control. The dynamic power flow (DPF) model is established to quantify the frequency response of the power system when the DFIG-SES system participates in the frequency regulation. The integration of the SES affects the internal power flow distribution of the DFIG; thus, the detailed model of the DFIG is incorporated into the DPF analysis. Considering the different response speeds of the synchronous generator (SG), the SES, and the DFIG to the frequency regulation, the first-order inertia delay in the governor control of the SG is included in the DPF model. The impact of the delay time constant on the continued operation time of the SES is analyzed. With the same deloading percentage, the output power of the DFIG is adjusted based on a variable droop coefficient scheme to fully utilize its active power reserve. The feasibility and effectiveness of the DFIG-SES scheme to participate in the frequency regulation are analyzed based on the DPF and verified through numerical analysis.

Keywords: dynamic power flow analysis; doubly fed induction generator; supercapacitor energy storage; frequency regulation (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
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