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Appl. Sci. 2018, 8(7), 1115; https://doi.org/10.3390/app8071115

Multi-Phase under Voltage Load Shedding Scheme for Preventing Delayed Voltage Recovery by Induction Motor Power Consumption Characteristics

Department of Electrical and Information Engineering, Seoul National University of Science and Technology, Seoul 01811, Korea
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Received: 22 June 2018 / Revised: 4 July 2018 / Accepted: 5 July 2018 / Published: 10 July 2018
(This article belongs to the Special Issue Renewable Energy 2018)
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Abstract

This paper aims to develop a multi-phase under voltage load shedding (MUVLS) strategy that effectively sheds the load to mitigate delayed voltage recovery (DVR). The major cause of the DVR phenomenon is related to the dynamic characteristics of induction motor (IM) loads. The deaccelerating and stalling of the IM load during disturbances is the main driving force of short-term voltage instability, resulting in an amount of reactive power consumption and excessive current draw. With the economic efficiency of energy use, the proportion of IM loads is gradually increasing, and this trend might deteriorate system stability. This paper focuses on the impact of IM loads in the Korean power system and analyzes the parameter sensitivity of IM loads and the proportion of appropriate IM loads. The proposed procedure for under voltage load shedding (UVLS) applies voltage stability criteria to decide the most efficient load shedding scheme. The determined MUVLS scheme can offer new and more effective remedial actions to maintain voltage stability, considering the characteristics of IM loads. Case studies on the Korean power system have validated the performance of the proposed MUVLS scheme under severe contingency scenarios, showing that the proposed strategy effectively mitigates DVR. View Full-Text
Keywords: delayed voltage recovery; induction motor load; load configuration; inertia constant; voltage recovery criteria; under voltage load shedding; short term voltage stability delayed voltage recovery; induction motor load; load configuration; inertia constant; voltage recovery criteria; under voltage load shedding; short term voltage stability
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Lee, Y.; Song, H. Multi-Phase under Voltage Load Shedding Scheme for Preventing Delayed Voltage Recovery by Induction Motor Power Consumption Characteristics. Appl. Sci. 2018, 8, 1115.

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