• Title/Summary/Keyword: power quality

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Development of Power Quality Management System with Power Quality Diagnosis Functions

  • Chung Il-Yop;Won Dong-Jun;Ahn Seon-Ju;Kim Joong-Moon;Moon Seung-Il;Seo Jang-Cheol;Choe Jong-Woong;Jang Gil-Soo
    • Journal of Electrical Engineering and Technology
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    • v.1 no.1
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    • pp.28-34
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    • 2006
  • Recently, in accordance with the development of IT technology, it is prevalent for power quality monitors to be connected to each other via networks and share their data because such networks provide system-wide insights to customers concerning power quality. Those systems can alarm and display power quality events for the convenience of customers. However, if a power quality event occurs, it is difficult for customers to determine its cause and solution because the systems do not provide appropriate power quality diagnosis functions. The power quality management system presented in this paper has been developed to provide customers with various power quality diagnosis functions so that they can cope well with power quality problems with the right measure in the right place. This paper presents the structure and functions of the developed power quality management system and shows some results of the power diagnosis functions.

A Study on Power Quality Detection Method of Utility interconnected Distributed Generation (분산전원이 연계된 배전계통에서의 전압품질 검출에 관한 연구)

  • Lee, B.Y.;Kim, J.C.;Jung, S.B.
    • Proceedings of the KIEE Conference
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    • 2004.11b
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    • pp.252-254
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    • 2004
  • This paper studies power quality problem of utility interconnected distributed generation. Recently, electronic devices that are sensitive to power quality have been increasing. Both utility and customer are interested in power quality problem. Therefore, we studied an effect of utility power quality caused by distributed generation. We detect and analysis voltage sag which is one of power quality indicator. Also, we used Matlab to simulate power quality problem.

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Development of the Web based Power Quality Monitoring System (웹 기반의 전기품질 감시장치 개발)

  • Nam, Kee-Young;Kim, Ho-Yong
    • Proceedings of the KIEE Conference
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    • 2002.07a
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    • pp.28-30
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    • 2002
  • The increasing application of electronic equipment has heightened the interest in power quality in recent years because there are economic impacts on utilities, customers, and suppliers of load equipment. The power quality would impose result in severe damage on many industrial customers. As having been supplied many kinds of electronic devices such as computer and communication equipment, automation equipment and various kinds of control devices etc., it comes to be more and more difficult to maintain the clean power quality. According to the restructuring in electricity industry the power quality may be treated as goods as contract terms and regulation elements between power supplier and consumer in the near future. Under the above environment, the power quality should be monitored for all day long with appropriate devices which is possible to measure and record the associated power quality data to prove each responsibility for the impacts when disputes arise due to power quality problems power quality problems are occurred. In this paper the authors propose some functions to be considered and system configuration to monitor the associated power quality elements in developing the web based power quality monitoring system.

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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.

Improved Evaluation Method of Flicker considering Disturbances of Power System

  • Kim, Jae-Chul;Moon, Jong-Fil;Jung, Seung-Bock;Choe, Kyu-Ha
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.22 no.3
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    • pp.8-14
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    • 2008
  • This paper studies a more exact flicker evaluation method by detecting power quality disturbances and excluding the effects of power quality disturbances. Up to the present, power quality disturbances affect flicker evaluation index because power quality problems do not have been considered. However, flick index should represent only flicker without power quality disturbances. Thus, in this paper, we present the improved flicker evaluation method which removing the effects of power quality disturbances such as voltage sag and transient caused by fault and inverter/breaker switching. We detect voltage sag and transient using wavelet transform and remove the effects of power quality disturbances from flicker index.

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.

IEC61850 Process Bus Based Distributed Power Quality Monitoring (IEC61850 프로세서 버스 기반 분산형 전력품질감시)

  • Park, Jong-Chan;Kim, Byung-Jin
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.56 no.1
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    • pp.13-18
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    • 2007
  • In this paper, authors deal with an application of power quality monitoring using the Sampled Value which is described in the IEC61850 International Standard for substation communication. Firstly, while Merging Unit is designed as a process level device transmitting sensor data, the practical problems such as time delay compensation and optical fiber communication are issued. Secondly, the Sampled Value message which is proper to a power quality monitoring system is presented. Because the power quality monitoring system requests non time critical service comparing to protection and control applications, the Sampled Value service message structure is introduced to improve efficiency. At last, the power quality monitoring server having various power quality analysis functions is suggested to verify the performance of Merging Unit. With the diverse experiments, it is proved that the process bus distributed solution is flexible and economic for the power quality monitoring.

Using Protective Relaying for Power Quality Monitoring (보호계전기를 이용한 전기품질 감시 기법 연구)

  • Bea, Y.J.;Lim, S.I.;Choi, I.S.;Lee, S.J.;Kim, J.H.;Kim, B.J.
    • Proceedings of the KIEE Conference
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    • 2002.11b
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    • pp.62-64
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    • 2002
  • Power quality monitoring system is devoted to more concern than before, because the innovation of industrial technology needs more accurate instruments and more advanced power quality. Therefore, this paper is proposed to use digital protective relays for power quality monitoring. In addition, taking power quality events, Electrical magnetic phenomenon of IEEE std 1159, proposing that adaptive power quality event list consider limitation memory capacity and signal processing ability of protective relay. The prototype S/W of power quality analysis is also developed. Especially this prototype S/W analysis scheme is verified through many kinds of power quality events (gathering protective relay data) in EMTP simulation.

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Power Quality Measurement and Analysis of Extra-High Voltage Customer (특고압 수용가의 전력품질 측정 및 분석)

  • Cho, Jae-Hyeong;Lee, Jong-Pil;Ji, Pyeong-Shik
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.64 no.4
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    • pp.286-290
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    • 2015
  • Power system is composed of a number of power devices and equipment. This factor affects the power quality is also displayed very complicated and varied. The accurate measurement and analysis of the causes of power quality problems is difficult. In preparing for these issues, there are many difficulties. In this study, Power quality of A public establishment of Chungbuk province were measured and analyzed. Measurement results of the fifth harmonic current was very large. Accordingly, the harmonic reduction will be needed. This research will be utilized as fundamental data to improve power quality for power utility and customer.

The Study of Distributed Disturbance Recording System (분산형 사고파형저장 시스템에 대한 연구)

  • Park, Jong-Chan;Lee, Se-In
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.57 no.1
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    • pp.30-35
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    • 2008
  • In this paper, the application of power Quality monitoring based on Sampled Value(SV) which is introduced in the IEC61850 International Standard for substation communication are discussed. Firstly, while Merging Unit(MU) is designed as a process level device transmitting sensor data, the practical problems such as time delay compensation and optical fiber communication are encountered. Secondly, the Sampled Value message which is proper to a power quality monitoring system is presented. Because the power quality monitoring system requests less time-critical service compared to protection and control applications, the Sampled Value service message structure is introduced to improve efficiency. Lastly, the power quality monitoring server having various power quality analysis functions is suggested to verify the performance of Merging Unit With the diverse experiments, it is proved that the process bus distributed solution is flexible and economic for the power quality monitoring.