• Title/Summary/Keyword: Power Quality Index

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Power Quality Index and Cost based on Load-Voltage Characteristics (부하의 전압특성을 고려한 모선별 전력품질 지표 및 가격 산정기법)

  • 이근준
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.52 no.4
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    • pp.213-218
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    • 2003
  • In front of the opening of electric distribution market in 2004, it is indispensable to have a proper estimation of power quality index and rower quality cost calculation mechanism which are indispensable to stabilize highly industrialized society and to vitalize the Investment lot electric power system. However, there were not enough measures to reflect the voltage characteristics such as voltage sags and Interruptions which make electric load in unstable operation. This paper suggests power quality index and power quality cost which translate various kinds of voltage records into bus load drop index(BLDI) and bus power quality cost(BPQC) based on aggregated load CBEMA curve. A sample calculation result shows that this method can produces the acceptable power Quality index and costs for utilities and customers requirements.

Bus Power Quality Index and Cost based on Load-Voltage Characteristics (부하의 전압특성을 고려한 모선별 전력품질 지표 및 가격 산정기법)

  • Lee, Geun-Joon;Heydt, G.T.
    • Proceedings of the KIEE Conference
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    • 2002.11b
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    • pp.9-14
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    • 2002
  • In front of the opening of electric distribution market in 2004. it is indispensable to have a proper estimation of power quality index and power quality cost calculation mechanism are indispensable to stabilize highly industrialized society and to vitalize the investment for electric power system. However, there were not enough measures to reflect the voltage characteristics such as voltage sags and interruptions which make electric load in unstable operation. This paper suggests power quality index(LDI) and power quality cost(LDC) which translate various kinds of voltage records into load drop index and cost based on aggregated load CBEMA curve. A sample calculation result shows that this method can produces the acceptable power quality index and costs for utilities and customers requirements.

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The Development of Probabilistic Power Quality Evaluation Method for Electrical Distribution System (배전시스템 전기설비 구성에 따른 확률론적 전력품질의 정량적 평가기법 개발)

  • Kim, Yong-Ha;Lee, Sung-Jun;Woo, Sung-Min;Lim, Hyun-Sung;Son, Seung-Ki;Ku, Min-Seo
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.21 no.8
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    • pp.34-43
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    • 2007
  • This paper presents a methodology on the AHP(Analytic Hierarchy Process) to calculate unified power quality index which provide an overall assessment of the distribution system performance. To obtain the unified power quality index. we propose the use of the AHP model and consider contingency using Monte Carlo simulation. The proposed method is especially useful and effective for planning. We have applied the proposed method to an actual relatively large system.

Development of Intelligence Electric Power Quality Assessment Model (지능형 전기품질 평가모델 개발)

  • Lee, Buhm;Choi, Nam-Sup;Kim, Kyung-Min
    • Journal of Institute of Control, Robotics and Systems
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    • v.13 no.6
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    • pp.531-536
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    • 2007
  • This paper presents a power quality assessment model based on the Analytic hierarchy process. This model can assess unified power quality index which provide an overall performance of the distribution system. To obtain the unified power quality index, we propose the use of the AHP model which has three states: [Ideal]-[Actual]-[Worst]. The proposed method is especially useful and effective for planning. We have applied the proposed method to an actual relatively large system, and verified the usefulness.

A Model for Power Quality Control Mechanism for Electric Power Market (전력시장체제하에서의 전력품질제어 메커니즘에 대한 모델링)

  • 이근준
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.52 no.7
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    • pp.381-386
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    • 2003
  • To provide a specified power quality under electric market system is becoming an important issue for customers and utility company. However, there is no realistic infra-structure to design a power system for the specified power quality. Present electric market is operating under the economic point of view. The low power price could be attractive, but the effect of low price could result the lower power quality for the long time and threat power system security. This paper presents a model which conceptualize the dynamic power quality control mechanism to minimize total cost of a society which is affected electric power quality. This model aims to produce a basic infra-structure to balance cost and quality under the electric market system.

A Study on Distortion Power Quality Index Based on 2-Level Analysis Applied to Electric Load Composition (배전시스템의 전기부하구성비 2단계 분석법을 통한 왜곡전력품질지수 연구)

  • Son, Seo-Eun;Jo, Si-Hun;Park, Jung-Wook
    • Proceedings of the KIEE Conference
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    • 2011.07a
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    • pp.133-134
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    • 2011
  • 본 논문은 배전시스템 내의 공통 접속점에 연결된 부하를 2단계로 분석하여 추정된 부하의 구성비를 왜곡전력 품질지수에 적용하는 방안에 관한 연구이다. 제안된 2단계 분석법은 기존의 배전시스템 내 전기부하의 구성비를 한꺼번에 추정하는 방법과 달리, 부하의 전류 파형을 고려해 전기부하를 분류하여 각 단계별로 부하구성비를 칼만 필터를 이용하여 추정한다. 제안된 부하구성비 추정법의 유효성은 분산전원이 포함된 모의배전시스템을 구성하여 검증한다. 또한, 모의 배전시스템 내에서 추정된 부하구성비를 왜곡전력 품질지수에 적용하여 부하들의 전력품질을 진단한다.

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Determining Optimal Custom Power Devices to Enhance Power Quality

  • Won Dong-Jun;Moon Seung-Il
    • KIEE International Transactions on Power Engineering
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    • v.5A no.3
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    • pp.280-285
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    • 2005
  • This paper proposes a novel method for determining the kind and rating of power quality solutions. To determine the kind of solution, event cause and direction are utilized. According to the event cause and direction, an adequate type of solution is determined for effective compensation. To rate the required capacity of solution, the concept of lost energy is adopted. Lost voltage, lost power and lost energy are calculated and the rating of the solution is determined to compensate a specific event. The rating method that utilizes the result of stochastic diagnosis is also proposed. A power quality index such as CP95 is adopted for solution suggestion. The method developed in this paper is applied to the test system and proved to be useful for enhancing the power quality of the customer system. It can provide customers with information pertaining to what is a proper and cost-effective solution among various compensating devices.

Reassessment of SMES Application Studies and Systematic approach Method under Deregulation (전력계통 제어용 초전도에너지 저장장치(SMES)의 검토사례 분석과 전력시장에서의 적용방안)

  • Lee, Geun-Joon;Yoon, Y.B.;Hwang, S.D.
    • Proceedings of the KIEE Conference
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    • 2003.11a
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    • pp.54-56
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    • 2003
  • With the advancement of superconductor materials, especially in HTC YBCO(Gen II), the feasibility of SMES in power systems become much higher than previous days application[1]. Also, with the de-regulation of electricity market, it is indispensable to have a proper estimation of power quality index and power quality cost calcluation mechanism to stabilize highly industrialized society and to vitalize the investment for electric power system. This paper suggests a comprehensive algorithm[2] to determine the policy of SMES investment with the PQ Indices[3] based on aggregated load CBEMA curve reflecting the voltage characteristics such as volatge sags and interruptions which make electric load in unstable operation.

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Study on the Measuring of Power Quality for the Residental PV System (가정용태양광 발전설비의 전력품질 측정에 관한 연구)

  • Ahn, Jae-Min;Han, Woon-Ki;Jung, Jin-Soo;Kim, Sun-Gu;Kim, Jae-Chul
    • Proceedings of the KIEE Conference
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    • 2009.07a
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    • pp.2176_2177
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    • 2009
  • This paper describe the power quality measuring result of the inter-connected residental PV system. The power quality measuring for inter-connected residental PV system are important to verify their performance and effect of power distribution system with inter-connected residental PV system. Also, these power quality measuring and analysis are essential to improve electrical safety. In order to evaluate influence of power distribution system with inter-connected residental PV system, we measure and analyze power quality index such as power, voltage, current, harmonic, THD, flicker index, power factor and frequency using DEWE5000.

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