• Title/Summary/Keyword: Power system load modeling

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Photovoltaic System Operation Optimal Technique Considering Climate Condition and Residential Loads Pattern (기후조건 및 실부하패턴을 고려한 태양광 시스템 최적 운전기법)

  • Moon, Hee-Sung;Choe, Gyu-Yeong;Kim, Jong-Soo;Lee, Yeong-Guk;Lee, Byoung-Kuk
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.58 no.12
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    • pp.2385-2390
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    • 2009
  • Based on the detailed analysis of output characteristics of PV array and residential load usage pattern, a design method to calculate optimal battery capacity for stand-alone PV generation systems is proposed. And also, according to power flow Actual irradiation and temperature data are analyzed to compose a PV array simulator and also six representative home appliances are electrically modeled for load simulator, along with 24hours usage pattern. The surplus and insufficient power can be calculated from the proposed simulation platform, so that selection of an optimal battery capacity can be possible. The theoretical analysis and design process will be explained, along with informative simulation results.

Study on a Probabilistic Load Forecasting Formula and Its Algorithm (전력부하의 확률가정적 최적예상식의 유도 및 전산프로그래밍에 관한 연구)

  • Myoung Sam Ko
    • 전기의세계
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    • v.22 no.2
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    • pp.28-32
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    • 1973
  • System modeling is applied in developing a probabilistic linear estimator for the load of an electric power system for the purpose of short term load forecasting. The model assumer that the load in given by the suns of a periodic discrete time serier with a period of 24 hour and a residual term such that the output of a discrete time dynamical linear system driven by a white random process and a deterministic input. And also we have established the main forecasting algorithms, which are essemtally the Kalman filter-predictor equations.

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A study on development dispatcher's training simulator in the operation of power system (훈련용시뮤레이터 현황과 향후계획)

  • Kim, Mun-Gi;Jeong, Chang-Deok
    • Proceedings of the KIEE Conference
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    • 1993.07a
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    • pp.515-517
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    • 1993
  • Dispatcher's Training simulation function are network analysis, power system modeling, supervisory control, and system security assessment. This function provides hand-on training for power dispatchers for operation of the nation control center in the future, it needs interface between simulator and expert system. This paper introduces DTS function which is adopted in the Central Load Dispatching Office.

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ULTC and Voltage Stability Analysis with use of IPLAN (IPLAN을 이용한 ULTC와 전압안정도 해석)

  • Hong, Young-Hwan;Baek, Young-Sik
    • Proceedings of the KIEE Conference
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    • 2004.11b
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    • pp.223-226
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    • 2004
  • This paper describers the power demand and the voltage stability in power system. Especially the power demand on summer is more and more increase in korea. According to load quantity is increasing voltage is getting down. And power system becomes unstable. So this paper is prevent voltage down using to ULTC modeling which is a part in a transformer. Therefore our purpose is power system stability increasing as variable state like a load increasing or a fault. Then this paper is using IPLAN and PSS/E as analysis tool. PSS/E is very powerful engine on load flow analysis. And IPLAN is capable of using on variable program compiling with user.

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Impact Analysis of Wind Power on Power System Reliability with Electric Vehicles (풍력발전과 전기자동차가 전력계통의 신뢰도에 미치는 영향 평가)

  • Kim, Dam;Park, Hyeongon;Kwon, Hungyu;Park, Jong-Keun
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.64 no.11
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    • pp.1535-1542
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    • 2015
  • An increasing number of electric vehicles (EVs) in power system affects its reliability in various aspects. Especially under high EV penetration level, new generating units are required to satisfy system's adequacy criterion. Wind power generation is expected to take the major portion of the new units due to environmental and economic issues. In this paper, the system reliability is analyzed using Loss of Load Expectation (LOLE) and Expected Energy Not Served (EENS) under each and both cases of increasing wind power generation and EVs. A probabilistic multi-state modeling method of wind turbine generator under various power output for adequate reliability evaluation is presented as well. EVs are modeled as loads under charging algorithm with Time-Of-Use (TOU) rates in order to incorporate EVs into hour-to-hour yearly load curve. With the expected load curve, the impact of EVs on the system adequacy is analyzed. Simulations show the reliability evaluation of increasing wind power capacity and number of EVs. With this method, system operator becomes capable of measuring appropriate wind power capacity to meet system reliability standard.

DQ Synchronous Reference Frame Model of a Series-Parallel Tuned Inductive Power Transfer System (직렬-병렬 공진 무선전력전송 시스템의 동기 좌표계 모델)

  • Noh, Eun-Chong;Lee, Sang-Min;Lee, Seung-Hwan
    • The Transactions of the Korean Institute of Power Electronics
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    • v.25 no.6
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    • pp.477-483
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    • 2020
  • This study proposes a DQ synchronous reference frame model of a series-parallel tuned inductive power transfer (SP-IPT) system. The wireless power transmission system experiences control difficulty because the transmitter-side controller cannot directly measure the receiver-side load voltages and currents. Therefore, a control-oriented circuit model that shows the dynamics of the IPT system is required to achieve a well-behaved controller. In this study, an equivalent circuit model of the SP-IPT system in a synchronously rotating reference frame is proposed using the single-phase DQ transformation technique. The proposed circuit model is helpful in modeling the dynamics of the voltages and currents of the transmitter- and receiver-side resonant tanks and loads. The proposed circuit model is evaluated using frequency- and time-domain simulation results.

Development of Data Aquisition System for Electrical Power Analysis of Electrical Load equipments (전기부하설비의 전력분석을 위한 데이터 획득 시스템의 개발)

  • 이상익;전정채;유대근
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.18 no.1
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    • pp.60-66
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    • 2004
  • In order to analyze voltage, current electrical power, harmonic and so on of electrical load equipments, electrical power analysis by real measurement rather than mathematical modeling is necessary, and plan of countermeasure for efficient management, energy frugality and accident prevention of electrical equipments using it is possible Especially, electrical power analysis by real measurement is indispensable in order to consider countermove of harmonic occurred by nonlinear load So, in this paper, we developed DSP(Digital Signal Processor) based low price date aquisition system, and verified it's ability by performing measurement and analysis of electrical power and harmonic in the real power system.

A Study on the Modeling and Operation Algorithm of Independent Power System for Carbon Free (Carbon Free를 위한 도서지역용 독립전원계통의 모델링 및 운용알고리즘에 관한 연구)

  • Wang, Jong-Yong;Kim, Byung-Ki;Park, Jea-Bum;Kim, Byung-Mok;Kim, Eung-Sang;Rho, Dae-Seok
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.65 no.5
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    • pp.760-768
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    • 2016
  • Recently, as one of the policies for carbon free operation method of independent power system replacing diesel generator with renewable energy such as wind power and photovoltaic(PV) system has been presented. Therefore, this paper proposes an operation algorithm and modeling of independent power system by considering CVCF(constant voltage constant frequency) ESS(energy storage system) for constant frequency and voltage, LC(load control) ESS for demand and supply balancing and SVC(static var compensator) for reactive power compensation. From the simulation results based on the various operation scenario, it is confirmed that proposed operation algorithm and modeling may contribute stable operation and carbon free in independent power system.

A Study for the Voltage Analysis Method of Distribution Systems with Distributed Generation (분산전원이 도입된 배전계통의 전압해석 방법에 관한 연구)

  • 김태응;김재언
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.52 no.2
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    • pp.69-78
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    • 2003
  • This paper presents a voltage analysis method of distribution systems interconnected with DG(Distributed Generation). Nowadays, small scale DG becomes to be introduced into power distribution systems. But in that case, it is difficult to properly maintain the terminal voltage of low voltage customers by using only ULTC(Under Load Tap Changer). This paper presents a voltage analysis method of distribution systems with DC for proper voltage regulation of power distribution systems with ULTC. In order to develop the voltage analysis method, distribution system modeling method and advanced loadflow method are proposed. Proposed method has been applied to a 22.9 kV practical power distribution systems.

Compensate Voltage Drop for Autotransformer-Fed AC Electric Railroad System with Single-Phase STATCOM (STATCOM을 이용한 교류 전기철도 급전시스템의 전압강하 보상)

  • 정현수;이승혁;김진오
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.16 no.5
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    • pp.53-60
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    • 2002
  • This paper presents exact autotransformer-fed AC electric railroad system modeling using constant current mode, and single-phase STATCOM(Static Synchronous Compensator) which has an effect on electric railroad system. An AC electric railroad is rapidly changing single-phase feeding electric power. To avoid voltage fluctuation under single phase loads, electric power should be received from a large source. The system modeling theory is based on the solution of algebraic. The AC electric railroad load model is nonlinear. Therefore this paper is considered nonlinear load using PSCAD/EMTDC. And the proposed modeling method is considered the line self-impedances and mutual-impedances that techniques for the AC electric railroad system modeling analysis, and that single-phase STATCOM can reliably compensate the voltage drop. In the case study, the allowance range of feeding voltage is 22.5∼27.5 kV, AT-fed AC electric railroad system circuit is analyzed by loop equation both normal and extension modes. The simulation objectives are to calculate the catenary and rail voltages with respect to ground, as the train moves along a section of line between two adjacent ATs. The results show that single-phase STATCOM can reduce the voltage drop in the feeding circuit and improve the power quality at AC electric railroad system by compensating the reactive power.