考虑不对称故障影响的感应电动机负荷动态特性快速解析算法

doi:10.19595/j.cnki.1000-6753.tces.191207

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Abstract The dynamic performance of induction motor loads has an important influence on power system voltage stability. To assess their post-asymmetrical fault transient response quickly and avoid tedious time-domain simulation, fast analytical method to calculate the dynamic performance of induction motors following power system voltage sag after asymmetrical and symmetrical fault is proposed based on circuit and machine analysis theory. Firstly, the first-order mechanical transient equation of the rotor is solved and the rotor’s speed and slip variations after disturbance are obtained. Based on this, the rotor’s phasor-form transient electric potential differential- equation is solved, and the change of the transient potential is attained. In the end, the current and the power response of the perturbed motor are acquired. This analytical method can easily be used in the Third-order electromechanical transient model of induction motor loads. Compared with PSCAD/EMTDC electromagnetic transient simulation results, the effectiveness of the algorithm is proved. Application of the proposed method to calculate the dynamic response of power system composite load demonstrates its utilization potential in power system stability studies.

Key words： Induction motor dynamic performance asymmetrical fault voltage sag analytical method

Received: 24 September 2019

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TM744

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	Liao Weiping
	Zhang Yan
	Feng Jiawei
	Fang Tao
	Su Jue

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Liao Weiping,Zhang Yan,Feng Jiawei等. Fast Analytical Method for Calculating the Dynamic Performance of Induction-Motor Loads Considering the Effect of Asymmetrical Fault[J]. Transactions of China Electrotechnical Society, 2020, 35(19): 4183-4193.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.191207 OR https://dgjsxb.ces-transaction.com/EN/Y2020/V35/I19/4183

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