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우리나라 계통의 주파수응답특성에 의한 발전기정수 산정에 관한 연구
정봉상(Bong-Sang Jeong),전영환(Yeong-Han Chun),김일동(Il-Dong Kim),양정재(Jeong-Jae Yang) 대한전기학회 2009 전기학회논문지 Vol.58 No.4
The response characteristics of power system frequency are determined by generator droop characteristics and load damping properties. The characteristics of governor droops are termed by generators constant, while those of load damping by load constant. In this paper, the generator constant and the load constant are assessed by measured data at the event of generator trips.
전력계통 신뢰도 강화를 위한 저주파계전기의 적정 부하차단 방안
김규호(Kyu-Ho Kim),송경빈(Kyung-Bin Song),김일동(Il-Dong Kim),양정재(Jeong-Jae Yang),조범섭(Beom-Seob Cho) 대한전기학회 2010 전기학회논문지 Vol.59 No.7
This paper proposes an efficient under frequency relay load shedding scheme for the korea power system which is more than two times than the system size and its capacity of the power system 10 years ago. The proposed method is keeping the power system stability and supports for the operating system during critical situations such as big disturbances and unstable in supply and demand. In order to determine the number of load shedding steps, the load to be shed per step, and frequency level, it is necessary to investigate and analyze maximum losses of generation due to the biggest contingency, maximum system overload, maximum keeping frequency, maximum load to be shed, and recovery frequency. The proposed method is applied to Off-peak load(25,400㎿) and Peak load(62,290㎿) of Korea Electric Power Corporation to demonstrate its effectiveness.
제주도 풍력발전기 출력변동성을 고려한 적정 UFR 차단방식 연구
박민수(Min-Su Park),전영환(Yeong-Han Chun),변성현(Sung-Hyun Byun),양정재(Jeong-Jae Yang) 대한전기학회 2014 전기학회논문지 Vol.63 No.4
Jeju power system is connected to the mainland power system through HVDC, and receives about half of required electricity through the HVDC lines. Jeju power system already experienced black out when a generator tripped at the moment of the HVDC line faults. But, UFR operated as was expected when HVDC line fault occurred at that time. As the penetration level of wind turbines increases, it is required to set UFR again considering intermittent wind turbin outputs. In this paper, we address a new way of UFR setting through computer simulation.
송전선로 고장제거 지연에 따른 동기 탈조 계전기 동작 검토
박지경(Ji-Kyung Park),김광현(Kwang-Hyun Kim),김철환(Chul-Hwan Kim),유영식(Young-Sik Lyu),양정재(Jeong-Jae Yang) 대한전기학회 2017 전기학회논문지 Vol.66 No.10
Generally, electrical torque in synchronous generator is balanced with the rotor mechanical torque under steady-state condition. Thus, the synchronous generator rotor rotates at constant speed. However, under fault condition, the electrical torque output is suddenly decreased and the sum of both torques does not remain constant. If the mechanical torque is not decreased at the same time, the generator rotor would accelerate. Therefore, this accelerating generator rotates at different speeds with respect to other generators in the power system. This phenomena is called as Out-of-Step (OOS). In this paper, we presented a certain two-step type quadrilateral OOS relay setting, which is applicable in actual field, and examined the validity of its setting value with OOS simulation conditions due to delayed fault clearing in transmission line. In order to conduct the study of OOS relay characteristics, we checked the impedance locus and generator output characteristics under the various delayed fault clearing conditions. Moreover, we proposed a countermeasure for avoiding the misoperation of OOS relay during the stable swing by modifying the setting values.
박지경(Ji-Kyung Park),김광현(Kwnag-Hyun Kim),김철환(Chul-Hwan Kim),유영식(Young-Sik Lyu),양정재(Jeong-Jae Yang) 대한전기학회 2017 전기학회논문지 Vol.66 No.8
After North American wide area black out on August 14, 2003, various studies have been conducted to find out the reason of the disaster. One of main reasons was misoperation of generator protection system. Since then, protective coordination between generator protection system and excitation system controls has been hot issue among electrical engineers. Among various generator protection relays, in this paper, we focused on generator overvoltage and overexcitation relay, which protect the over-flux condition of the generator. Thus, at first, we modeled the generator overvoltage, overexcitation relay and detailed power system including excitation system, governor and etc., based on actual field data. And then, we reviewed the protective coordination of generator overvoltage and overexcitation relay using electromagnetic transient program. In addition, we discussed the protective coordination method for redundant protection relays in both automatic voltage regulator and generator side.