Active and Reactive Power Joint Balancing for Analyzing Short-Term Voltage Instability Caused by Induction Motor

Ding Wang, Yangwu Shen, Zhen Hu, Ting Cui and Xiaoming Yuan
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Ding Wang: State Grid Hunan Electric Power Company Limited Research Institute, Changsha 410007, China
Yangwu Shen: State Grid Hunan Electric Power Company Limited Research Institute, Changsha 410007, China
Zhen Hu: State Grid Hunan Electric Power Company Limited Research Institute, Changsha 410007, China
Ting Cui: State Grid Hunan Electric Power Company Limited Research Institute, Changsha 410007, China
Xiaoming Yuan: State Key Laboratory of Advanced Electromagnetic Engineering Technology, Huazhong University of Science and Technology, Wuhan 430074, China

Energies, 2019, vol. 12, issue 19, 1-16

Abstract: Short-term voltage instability has a sensational effect once it occurs with massive loss of load, possibly area instability, and voltage collapse. This paper analyzes the short-term voltage instability caused by induction motor from the viewpoint of active and reactive power joint balancing. The analysis method is based on (1) the reactive power balancing between system supply and induction motor demand, and (2) the active power balancing between air-gap power and mechanical power, which is expressed by the region of rotor acceleration and deceleration in the Q - V plane. With the region of rotor acceleration and deceleration in the Q - V plane and the reactive power balancing, the movement direction of the operating point can be visually observed in the Q - V plane, thereby achieving a clear comprehension of physical properties behind the short-term voltage instability phenomenon. Furthermore, the instability mechanisms of two kinds of grid-connected induction motor operation conditions after a large disturbance are discussed to explain the basic theory of the analysis method and to provide examples of its application. Time-domain simulations are presented for a single-load infinite-bus system to validate the analyses.

Keywords: induction machine; short-term voltage stability; stalling; abnormally low voltage (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
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