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A Study on Voltage Sag Assessment for Multiple Sensitive Loads Based on Probabilistic Prediction
Chae Hakyung,Park Chang-Hyun 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.3
This paper presents a voltage sag assessment method that considers the voltage tolerance characteristic of multiple loads in a power system. In general, load sensitivity to a voltage sag is characterized by a voltage magnitude and duration expressed as a voltage tolerance curve (VTC). In order to assess the impact of voltage sags on a load, it is essential to estimate the expected voltage sag frequency that reflects the load’s VTC. However, most of the previous assessment methods have focused on rectangular shape VTCs; hence, there is a limitation in that these methods cannot reflect various load sensitivities. This paper proposes an effective method of voltage sag assessment based on vulnerable areas and numerical interpolation by considering diagonal shape as well as rectangular shape VTCs. And the voltage sag duration is estimated using a probability model based on the historical data of protection systems. In addition, the proposed method significantly reduces computational burden for voltage sag assessment while showing similar results to the existing methods. In the case study, the performance of the proposed method was verified using the IEEE-30 bus system with various multiple sensitive loads.
부하의 전압 내성 특성을 고려한 순간전압강하 평가 연구
채하경(Hakyung Chae),박창현(Chang-Hyun Park) 대한전기학회 2021 전기학회논문지 Vol.70 No.2
This paper presents a novel method to assess voltage sags by taking into account the voltage tolerance characteristic of loads. In general, the tolerance characteristic is expressed in the form of a two-dimensional curve of voltage magnitude and duration. Also, the shape of characteristic curves depend on the type of loads. In order to estimate the expected sag frequency affecting sensitive loads, it is necessary to perform a voltage sag assessment considering the voltage tolerance curves of loads. However, because most existing methods of voltage sag assessment only focus on voltage sag magnitudes, these methods have limitations in reflecting various types of tolerance curves. In this paper, an effective method for reflecting various thresholds of sag magnitude and duration is proposed. The proposed method performs voltage sag assessment based on the area of vulnerability for given voltage thresholds and sag durations are estimated using a probability model on the historical operation data of protection system. In addition, we propose an effective assessment scheme based on the concept of measuration by division for a slope-shape tolerance curve.