Equivalent Inertia Estimation of Asynchronous Motor and Its Effect on Power System Frequency Response

Xingyong Zhao, Penghui Qin () and Zhen Tang
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Xingyong Zhao: School of Electric Power, Civil Engineering and Architecture, Shanxi University, Taiyuan 030006, China
Penghui Qin: School of Electric Power, Civil Engineering and Architecture, Shanxi University, Taiyuan 030006, China
Zhen Tang: State Grid Shanxi Electric Power Research Institute, Taiyuan 030001, China

Energies, 2022, vol. 15, issue 22, 1-16

Abstract: With the increase in renewable energy penetration, the traditional synchronous generator is gradually replaced, resulting in the decrease in system inertia level and the weakening of frequency modulation capability. In addition to synchronous inertia, load inertia of asynchronous motors also widely exists in power systems, but its effect on system frequency stability has not been fully studied. To this end, based on the detailed model of asynchronous motor, the amplitude–phase motion equation based on potential after transient reactance is proposed, and then the phase motion equation of potential after transient reactance is derived to evaluate the equivalent inertia of asynchronous motor under electromechanical time scale. The equivalent inertia of asynchronous motor is studied theoretically by building the system frequency response model. The results show that the equivalent inertia of asynchronous motor can essentially improve the system frequency stability, while showing time-varying characteristics due to the combined effect of slip frequency and rotor speed. The analyses are validated with time-domain simulation results. The proposed method lays a foundation for mechanistic understanding of the frequency characteristics of the equivalent inertia of asynchronous motors affected by active and reactive power and its influence on the system frequency characteristics.

Keywords: potential after transient reactance; asynchronous motor; electromechanical time scale; equivalent inertia (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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