• 제목/요약/키워드: Power quality

검색결과 959건 처리시간 0.279초

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

  • 이범;최남섭;김경민
    • 제어로봇시스템학회논문지
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    • 제13권6호
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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.

Complex Neural Classifiers for Power Quality Data Mining

  • Vidhya, S.;Kamaraj, V.
    • Journal of Electrical Engineering and Technology
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    • 제13권4호
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    • pp.1715-1723
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    • 2018
  • This work investigates the performance of fully complex- valued radial basis function network(FC-RBF) and complex extreme learning machine (CELM) based neural approaches for classification of power quality disturbances. This work engages the use of S-Transform to extract the features relating to single and combined power quality disturbances. The performance of the classifiers are compared with their real valued counterparts namely extreme learning machine(ELM) and support vector machine(SVM) in terms of convergence and classification ability. The results signify the suitability of complex valued classifiers for power quality disturbance classification.

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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    • 제5A권3호
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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.

전력품질 감시 시스템 개발(2): 객체지향 방법론을 적용한 전력품질 분석 소프트웨어 설계 (Development of Power Quality Monitoring System(PQMS) : Object-Oriented Design for Power Quality Analysis Software)

  • 김영일;방순정;한진희;윤태욱
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2003년도 추계학술대회 논문집 전력기술부문
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    • pp.131-133
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    • 2003
  • In this papers, it will be introduced that power quality analysis software design including investigation of mutual relation between power quality data and mechanism for getting data from power quality database according as based on object-oriented methodology. The UML which is only a language and so is just part of a software development, may be used to visualize, specify, construct, and document the artifacts of software-intensive system.

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전력품질 감시 시스템 개발(3) : 전력품질 감시 시스템 (Development of Power Quality Monitoring System)

  • 방순정;김영일;한진희;윤태욱
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2003년도 추계학술대회 논문집 전력기술부문
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    • pp.158-160
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    • 2003
  • Recently, with the increasing use of power semiconductors and microprocessors which are very sensitive to little change of power quality and for coping positively with anticipating power quality disputes between power providers and consumers which are possible to occur by of power market being formed, the power quality problem has gained preponderance among the contemporary research areas. To serve these purposes, this paper is described the integrated system for power quality monitoring, which provides speedy and powerful functions by analyzing the Event data and diverse graphic interfaces for user.

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전력계통의 전력품질 외란을 고려한 플리커 평가에 관한 연구 (A Study on Filcker Evaluation Considering Power Quality Disturbance of Power System)

  • 정승복;김재철
    • 한국조명전기설비학회:학술대회논문집
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    • 한국조명전기설비학회 2006년도 춘계학술대회 논문집
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    • pp.376-379
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    • 2006
  • This paper studies flicker evaluation considering power quality disturbance. A flicker problem with light device irritates human's eyes. Also, the flicker problem has an influence on adverse effect such as rolling device and rotating device. However, a study of flicker evaluation is not complete. A flicker is measured and evaluated at monitoring point. But we consider power qualify disturbances such as voltage sag and transient that cause fault and inverter/breaker switching. Power quality disturbances affects flicker evaluation. A flicker evaluation index increases. Therefore, we consider power quality disturbances. We detect voltage sag and transient using wavelet and evaluate flicker without flicker index including power quality disturbances.

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Power Quality Improvement in Autonomous Microgrids Using Multi-functional Voltage Source Inverters: A Comprehensive Review

  • Miveh, Mohammad Reza;Rahmat, Mohd Fadli;Ghadimi, Ali Asghar;Mustafa, Mohd Wazir
    • Journal of Power Electronics
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    • 제15권4호
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    • pp.1054-1065
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    • 2015
  • Multi-functional voltage source inverters (VSIs) have attracted increasing attention in recent years for their advantageous auxiliary services for power quality enhancement in autonomous microgrids. These types of VSIs can not only achieve a proper control scheme in autonomous mode but also cope with the prescribed power quality and stability requirements. These functionalities are integrated within the same device, thereby significantly improving the cost-effectiveness of microgrids while decreasing the investment and bulk compared with those of multiple devices with independent functionalities. Control strategies for power quality enhancement in autonomous microgrids using multi-functional VSIs are comprehensively reviewed in this paper. In addition, such VSIs are discussed in detail, and comparisons of which are also provided. Lastly, a number of future research directions for multi-functional VSIs are recommended.

필터뱅크와 적응필터를 이용한 전력품질 외란 검출기법 (Power Quality Disturbances Detection Technique using Filter Bank and Adaptive Filters)

  • 윤재준;이정규;손상욱;배현덕
    • 전기학회논문지
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    • 제61권1호
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    • pp.162-167
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    • 2012
  • In power quality monitoring, it is very important to detect disturbances (sag, swell, transient, and interruption) accurately. In this paper, a detection method for power quality disturbances by combining the filter bank system and adaptive filter is proposed. To decompose power signal, binary tree structured filter bank system is designed. In the filter bank system, the fundamental filter bank(QMF bank) is used as a module in each decomposing level. An adaptive filter is used to improve the detection accuracy of disturbances for each subband signal. In the adaptive filter, the measure of estimated error change is used to detect singular points of power quality disturbances. Computer simulations were performed on synthetic signals which have disturbances to assess the performance of the proposed method.

분산전원 연계형 UPQC(Unified Power Quality Conditioner)의 성능해석 (Performance Analysis for the UPQC(Unified Power Quality Conditioner) Interconnected to the Distributed Generation System)

  • 김희중;배병열;한병문
    • 대한전기학회논문지:전력기술부문A
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    • 제53권3호
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    • pp.152-160
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    • 2004
  • A novel UPQC(Unified Power Quality Conditioner), which consists of series inverter, shunt inverter, distributed generation system, is proposed. The proposing system can compensate reactive power, harmonics, voltage sag and swell, voltage interruption etc. through the change of paralleling operation mode and islanding operation mode. The control strategy for the proposing system was derived using the instantaneous power method. The performance of proposing system was analyzed by means of the PSCAD/EMTDC simulation and the experimental work with the hardware prototype. The proposing system has the ultimate capability of improving power quality at the point of installation on power distribution systems or Industrial power systems and can be utilized for the custom power device in th future distribution system.

Digital-Controlled Single-Phase Unified Power Quality Conditioner for Non-linear and Voltage Sensitive Loads

  • Ryoo Hong-Je;Kim Jong-Soo;Kisck Dragos Ovidiu
    • KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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    • 제5B권4호
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    • pp.374-381
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    • 2005
  • The ability to provide quality power has become a significant issue in power systems. The main causes of poor power quality are harmonic currents, poor power factor, supply-voltage variations, etc. A technique of achieving both active current distortion compensation, power factor correction and also mitigating the supply-voltage variation (sag or swell) at the load side is presented in this paper. The operation and rating issues of the proposed Single-phase Unified Power Quality Conditioner are also highlighted. To reduce the total cost while simultaneously increasing the performance, the system is fully digitally controlled using the fixed-point TMS320F240 digital signal processor. The performances of the UPQC, which is composed by shunt and series PWM controlled-converters, have been verified on a laboratory prototype.