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Your search keyword '"Woo-Kyu Chae"' showing total 3 results
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3 results on '"Woo-Kyu Chae"'

1. LSTM-Based Fault Direction Estimation and Protection Coordination for Networked Distribution System

Author

Woo-Hyun Kim, Ju-Yong Kim, Woo-Kyu Chae, Geonho Kim, and Chun-Kwon Lee

Subjects
Protection coordination, distribution system, closed-loop system, networked distribution system, fault direction, long short-term memory, Electrical engineering. Electronics. Nuclear engineering, TK1-9971
Abstract

While the world’s power distribution system resembles an intricate web-like structure, the most conventionally implemented distribution mechanism is the radial distribution system (RDS) where connection points for each distribution line are normally kept open. However, disadvantages regarding the traditional system have led to active research on establishing the networked distribution system (NDS), in which multiple circuits are interconnected with electricity as well as high-speed communication systems. The NDS offers multiple advantages including increased facility utilization, increased hosting capacity, and higher terminal voltage. Conversely, an unsolved issue prevails as the existing protection coordination method designed for the RDS is inadequate for fault occurrences in the NDS due to inaccurate fault direction identification. Hence, there is an urgent need for an alternative protection coordination method that allows high precision fault direction identification through communication. Moreover, the application of various existing technologies is hindered as the distance relay protection coordination algorithm malfunctions in situations where distribution lines are of short length, loads are dispersed onto multiple lines, and integration of distributed generation (DG) is frequent. Therefore, this paper presents a fault direction identification method that uses the waveform of the fault current based on long short-term memory (LSTM) neural network and a communication-based protection coordination scheme that can be applied in fault situations within an NDS.

Published
2022
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2. Optimal interconnection device for distributed energy resources of customer

Author

Jintae Cho, Juyong Kim, Woo-Kyu Chae, and Jungsung Park

Subjects
Interconnection, Engineering, Electric power system, Smart grid, business.industry, Distributed generation, Electrical engineering, Inverter, Electricity, Transfer switch, Intelligent electronic device, business
Abstract

This paper proposes a smart switch panel (SSP) that can link distributed generations more economically and actively to improve power quality for customers, prevent power failure through independent operation in case of power failure in electric power systems (EPS), and trade electricity with Smart Grid operation systems as they become more widespread. For the economical interconnection of distributed generations and to reduce installation spaces, a power converter was installed in the switch panel, and the power converter was proposed in a form wherein diverse distributed generations share the DC link and inverter. A static transfer switch (STS) was installed so that customers can prevent power failure through independent operation even in case of EPS failure. An intelligent electronic device (IED) was installed so that power can be exchanged with EPS or nearby customers and to enable protection control so that all current standards for the interconnection of distributed generations are met.

Published
2012

3. Cooperative operation method of two battery systems at Microgrid system

Author

Hakju Lee, Won-Wook Jung, Jungsung Park, and Woo-Kyu Chae

Subjects
Battery (electricity), Flow control (data), Engineering, business.industry, Automatic frequency control, law.invention, Energy management system, Capacitor, law, Control theory, Voltage droop, Microgrid, business, Power control
Abstract

The grid-interconnected Microgrid must be able to operate without the utility's grid to supply electricity in case of outage. To operate in standalone mode, the Microgrid must control electricity demand or supply to maintain the frequency. The Microgrid EMS (Energy Management System) could control supply and demand with the AGC (Auto Generation Control) function using a communication line. Note, however, that the period of AGC is too slow to maintain the frequency if there is rapid variation in loads or generation. Moreover, the transition of operation mode could fail if there is too much power flow at PCC (Point of Common Coupling). In this paper, we propose a method of improving the stability of the grid-interconnected Microgrid using BESS (Battery Energy Storage System) and super capacitor. The cooperative control method between BESS and super capacitor uses droop, which is used at the generator. BESS could operate as UPC (Unit Power Control) or FFC (Feeder Flow Control) depending on Microgrid's operation strategy. We simulate the cooperative control method using PSCAD/EMTDC to verify the validity of the method. As a result, Microgrid's stability is improved using the cooperative control method, and the life span of BESS could be prolonged.

Published
2012

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