• Proceedings of the KIEE Conference
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• 2005.07a
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• pp.146-148
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• 2005

The number of wind generation installations are growing substantially in Jeju, Korea. Many of these installations are significant in size and directly connected to the distribution system. In these distributed applications, it is not uncommon for the turbines to be connected near the end of a long rural distribution feeder from which end-users are served. Therefore, utility grid interconnection standards for interconnecting non-utility distributed generation systems are essential to both power system company and generation company. In this paper, it is investigated the power quality of Sungsan substation bus connected to Hangwon wind power generation farm.

• Proceedings of the KIEE Conference
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• 2002.07a
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• pp.274-276
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• 2002

긴급보호제어시스템(SPS, Special Protection System)은 일반적인 보호동작 범위를 벗어난 외란에 대해서 계통 전지역의 보호를 목적으로 하는 광역시스템 보호기술이다. 따라서 SPS는 외란 시에 계통 장비의 보호보다는 계통을 보호함으로써 전력 공급능력 향상에 주안점을 두게 된다. SPS는 자주 동작하지 않고 평소에는 대기 상태로 있으며, 긴급한 동작이 요구되기 때문에 많은 경우에 그 동작이 미리 결정되어 있다. SPS는 입력변수나 전력계통에의 영향에 따라 분류할 수 있는데, 입력변수에 따라서는 계통 응답에 기초한 SPS와 사고에 기초한 SPS로 나눌 수 있다. 발전기 탈락, 부하 차단이 SPS의 주요 보호 동작이며 이 외에 가스터빈이나 양수발전기 기동, AGC 제어, HVDC 고속전력변환, 분로기기의 자동스위칭 등의 제어 동작이 있다. 우리나라의 경우에는 주로 동기탈조 방지를 위한 발전기 탈락의 동작을 하는 SPS가 설치, 운전되고 있다.

• Proceedings of the KIEE Conference
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• 2003.07a
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• pp.184-186
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• 2003

Power systems must be operated within limits that will ensure adequate generation and transmission capacity to avoid cascading. In developing a set of operations limits, it is important to do so within a general framework in order to ensure that the operating objectives are met. In the this regard, when the system experiences a generation-load imbalance, the principles of sound operation will be maintained by bringing under control an unscheduled power flow condition as quickly as possible. This paper presents load shedding application which responds both to frequency and to rate of change of frequency. Its application is in the operating situation of load suddenly in excess of generation, either because of generator or other equipment failure. A scheme which is able to utilize rate of change of frequency as well as frequency itself is an improvement over existing scheme.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.433-434
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• 2007

제주계통은 육지에 비해 상대적으로 작은 계통 규모(300$\sim$600MW)를 갖고 있지만, HVDC 연계선에 의한 의존도가 30$\sim$50%로 매우 높다. 또한, 계통에 비해 그 규모가 큰 100 MW 발전기 2대가 현재 새로 운영 중에 있는 등, 주파수 안정도 측면에서 많은 부분이 고려되어야한다. 2006년 4월 1일 제주도 정전 사고도 주파수 안정도 문제에 기인하고 있고, 이는 HVDC 연계선 탈락 시 독립된 계통으로서의 주파수 안정도 부분에 대한 연구가 필요함을 보여준다. 2006년 4월 1일 이후, 제주도의 전력 계통은 발전설비 증대와 예비력 확보, 부하차단 방식변화 등으로 안정적인 계통 운영을 위해 전반적인 변화를 주었다. 하지만, 지난 대규모 정전사고에서 알 수 있듯이, HVDC 연계선에 의한 의존도가 최대 50%로 높은 제주계통의 특성상, HVCD 연계선이 탈락된 이후, 독립계통으로서의 안정적인 운영을 위한 노력이 필요하다.

• New & Renewable Energy
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• v.18 no.3
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• pp.32-42
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• 2022

Rapid spread of intermittent renewable energy has amplified the instability and uncertainty of power systems. The Korea Power Exchange (KPX) promoted efficient management by opening the power brokerage market in 2019. By combining small-scale intermittent renewable energy with a flexible facility through the power brokerage market, the KPX aims to develop a virtual power plant system that will allow the conversion of existing intermittent renewable energy into collective power plants. However, the participation rate of renewable power owners in the power brokerage market is relatively low because other markets such as the small solar power contract market or the Korea Electric Power Corporation power purchase agreement are more profitable. In this study, we used a choice experiment to determine the attributes affecting the participation rate in the power brokerage market for 113 renewable power owners and estimate the value of the power brokerage market. According to the estimation results, a low smart meter installation cost, low profit variations, long contract periods, and few clearances increased the probability of participation. Moreover, the average value of the power brokerage market was estimated to be 2.63 million KRW per power owner.

• Journal of Korea Water Resources Association
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• v.53 no.spc1
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• pp.785-795
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• 2020

Recently, the integrated management of the quantity and quality of water was been derived by the Ministry of Environment in Korea. This reconstruction in the national government organization can be recognized as the major politic measure. For this IWRM (Integrated Water Resources Management), it is necessary to be able to fairly distribute, operate and manage water resources in a situation where related techniques are needed to fully support, such as measuring exactly the demand and supply of water resources. The reason why IWRM is difficult, despite the development of related technologies, is because the management entities are highly diverse and their interests are much complicated. Thus, this study is tried to suggest specific improvement for current policies by benchmarking the KPX (Korea Power Exchange). In the field of water management as similar to the electric industry, there is an essential need for a working-level organization that can manage, control, monitor, and regulate water resources with practical and plenipotentiary control like the non-profit organization, KPX. Such time has come for decisive policy changes through benchmarking the structure, system, productivity, and challenges of the electricity industry in the water policy.

• Review of KIISC
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• v.25 no.5
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• pp.67-73
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• 2015

한국형 계통운영시스템인 전력거래소(KPX)의 EMS(Energy Management System)와 한국전력공사(이하 한전)의 급전소 SCADA시스템은 서로 ICCP(Inter-Control Center Protocol)를 통한 데이터 교환을 하고 있다. 현재의 ICCP는 데이터 교환에 있어서 보안 기능이 고려되어 있지 않기 때문에 본 논문에서는 안전하고 신뢰성 있는 계통운영시스템 간 데이터 교환을 위한 ICCP/TASE.2의 보안 통신 기능 개발을 소개하고자 한다.

• Proceedings of the KIEE Conference
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• 2002.07a
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• pp.389-391
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• 2002

This paper presents the System Marginal Price(SMp) forecasting implementation using backpropagation Neural Networks in Competitive Electricity Market. SMP is very important term to seek the maximum profit to bidding participants. Demand and SMP that necessary data for training Neural Networks, supplied from Korea Power Exchange(KPX). Statistic analysis about predicted SMP presents a part of consideration in end of this paper.

• Proceedings of the KIEE Conference
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• 2001.11b
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• pp.272-274
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• 2001

This paper presents a model for short-term load forecasting using relationship of temperature and load. We made one-day ahead load forecasting model using hourly normalized load and 11 dummy variables that were classified by day characteristics such as day of the week, holiday, and special holiday.

• Proceedings of the KIEE Conference
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• 2003.07a
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• pp.596-598
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• 2003

본 논문에서는 CBP 가격을 기반으로, TWBP시장의 가격을 분석하였다. KPX가 발표한 SMP와 수요예측자료로 누적입찰자료를 추정하었으며, 이를 이용하여 계획예방정비에 따른 TWBP가격 변동을 시뮬레이션 하였다.