• 제목/요약/키워드: Economic load dispatch

검색결과 71건 처리시간 0.024초

구분적인 이차 비용함수를 가진 경제급전 문제에 적응진화연산 적용 (Adaptive Evolutionary Computation to Economic Load Dispatch Problem with Piecewise Quadratic Cost Funcion)

  • 문경준;황기현;김형수;박준호;정정원
    • 대한전기학회:학술대회논문집
    • /
    • 대한전기학회 1998년도 하계학술대회 논문집 C
    • /
    • pp.844-846
    • /
    • 1998
  • In this study, an adaptive evolutionary computation(AEC), which uses adaptively a genetic algorithm having global searching capability and an evolution strategy having local searching capability with different methodologies, is suggested. This paper develops AEC for solving ELD problem with piecewise quadratic cost function. Numerical results show that the proposed AEC can provide accurate dispatch solutions within reasonable time for the ELD problem with piecewise quadratic cost function.

  • PDF

이차 발전비용함수를 사용한 경제급전문제의 균형-교환 최적화 (Balance-Swap Optimization of Economic Load Dispatch Problem using Quadratic Fuel Cost Function)

  • 이상운
    • 한국인터넷방송통신학회논문지
    • /
    • 제14권4호
    • /
    • pp.243-250
    • /
    • 2014
  • 본 논문은 이차 발전비용 함수를 적용하는 경제급전의 최적화 문제에 대한 균형-교환 최적화 알고리즘을 제안하였다. 제안된 알고리즘은 초기치 $P_i{\leftarrow}P_i^{max}$, (${\Sigma}P_i^{max}$ > $P_d$)에 대해 ${\Sigma}P_i=P_d$일 때까지 $_{max}\{F(P_i)-F(P_i-{\alpha})\}$, ${\alpha}=_{min}(P_i-P_i^{min})$인 발전기 i의 출력량을 $P_i{\leftarrow}P_i-{\alpha}$로 균형과정을 수행하고, 교환과정은 $_{max}\{F(P_i)-F(P_i-{\beta})\}$ > $_{min}\{F(P_i+{{\beta})-F(P_j)\}$, $i{\neq}j$, ${\beta}$ = 1.0, 0.1, 0.1, 0.01, 0.001에 대해 $P_i{\leftarrow}P_i-{\beta}$, $P_j{\leftarrow}P_j+{\beta}$로 수행하였다. 제안된 방법을 15, 20과 38-발전기 사례에 적용한 결과 간단하면서도 항상 동일한 결과로 가장 좋은 결과를 나타내었다. 또한, 73-발전기를 통합하여 경제급전을 수행한 결과 독립적으로 운영하는 경우에 비해 발전비용을 현저히 절약할 수 있음을 보였다.

DP법에 의한 화력계통의 최적병렬치수 결정 및 부하배분 (Determination of optimal unit commitment and load dispatch for thermal power system by DP method)

  • 양흥석;이문호
    • 전기의세계
    • /
    • 제21권2호
    • /
    • pp.34-40
    • /
    • 1972
  • This paper describes the problem of the shortange-economic-scheduling for unit commitment and load dispatching in thermal power system. For economic operation of thermal system, the optimum time of startup and shoutdown of the generating unit must be determined so as to minimize the sum of generating and starting fuel cost over a given period. The above problems are analyzed for the purpose of the application of Dynamic Programing Method. Also the technique of Dynamic Programming is applied to the problems. For the illustative purpose, a case study was made on a model system composed of eight units and the computing time was about 190 seconds by IBM 360-40 system. Therefore, one can utilize this suggested method on any of the practical power systems.

  • PDF

열병합발전소의 최적운전 알고리즘 개발 (A Study on the Model Development of CHP optimal operation algorithm)

  • 김용하;백범민;우성민;이광성;신형철
    • 대한전기학회:학술대회논문집
    • /
    • 대한전기학회 2008년도 제39회 하계학술대회
    • /
    • pp.522-523
    • /
    • 2008
  • This paper develops optimal operation mechanism of CHP(Combine Heat and Power) for enhancement of energy efficiency. It verify optimal operation of Accumulator using Economic Heat Load Dispatch and Dynamic Programing through case study.

  • PDF

CES 발전소의 최적운용 알고리즘 개발 (Development of Optimal Operation Algorithm about CES Power Plant)

  • 김용하;박화용;김의경;우성민;이원구
    • 조명전기설비학회논문지
    • /
    • 제26권2호
    • /
    • pp.61-70
    • /
    • 2012
  • Recently due to the increasing of the importance on the green energy is getting higher by implementing EERS(Energy Efficiency Resource Standards) and NA(Negotiated Agreement) such as lacks of natural resources and The United Nations Framework Convention on Climate Change. And the most practical solution is CHP(Combined Heat and Power) which performs the best energy efficiency. This paper developed optimal operation mechanism of CES(Community Energy System) for enhancement of energy efficiency using CHP(Combined Heat and Power), PLB(Peak Load Boiler) and ACC(ACCumulator) capacities. This method optimally operated these capacities calculated the maximum profits by Dynamic Programing. Through the case studies, it is verified that the proposed algorithm of can evaluate availability.

Fuzzy Decision을 사용한 단기부하예측 전문가 시스템 (An Expert System for Short Term Load Forecasting by Fuzzy Decision)

  • 박영일;박종근
    • 대한전기학회:학술대회논문집
    • /
    • 대한전기학회 1988년도 추계학술대회 논문집 학회본부
    • /
    • pp.118-121
    • /
    • 1988
  • Load forecasting is an important issue as for the economic dispatch and there have been many researches which are classfied into two classes, time series method and factor analysis method. But the former is not adaptive for a sudden change of a correlated factor and the latter is not inefficient as the factor estimation is not easy. To make matters worse, both of them are not good for the estimation of special days. It is because the load forecasting is not a problem modeled precisely in mathematics, but a problem requires experience and knowledge those can solve it case by case. In this viewpoint, an expert system is proposed which can use complicated experience of an expert by use of fuzzy decision.

  • PDF

정적 전압의존형 부하모델을 적용한 B계수 산정법 (A Computation Method of B-coefficient With Static Voltage Dependent Load Model)

  • 이명환;채명석;신중린
    • 대한전기학회:학술대회논문집
    • /
    • 대한전기학회 1997년도 추계학술대회 논문집 학회본부
    • /
    • pp.218-220
    • /
    • 1997
  • In power system, economic dispatch problem is to minimize fuel cost with inequality constraints of generator output. To solve this problem it is very important to express power loss equation that have Quadratic function of generator power included B-coefficient. This paper presents a method in determining B-coefficient by use A-matrix that is calculated by power flow considering voltage dependent static load model. The proposed algorithm is tested with IEEE 6 bus sample system, which shows the result in each cases by the change of load component factor.

  • PDF

발전기 기동정지 계획에 적용되는 불확실한 부하곡선에 대한 통계적 분석 (Stochastic Analysis of the Uncertain Hourly Load Demand Applying to Unit Commitment Problem)

  • 정춘식;박정도;국현종;문영현
    • 대한전기학회:학술대회논문집
    • /
    • 대한전기학회 2000년도 하계학술대회 논문집 A
    • /
    • pp.337-340
    • /
    • 2000
  • In this paper, the effects of the uncertain hourly load demand are stochastically analyzed especially by the consideration of the average over generation of the Unit Commitment(UC) results. In order to minimize the effects of the actual load profile change, a new UC algorithm is proposed. The proposed algorithm calculates the UC results with the lower load level than the one generated by the conventional load forecast. In case of the worse load forecast, the deviation of the conventional UC solution can be overcome with the lower load level and the more hourly reserve requirements. The proposed method is tested with sample systems, which shows that the proposed method can be used as the basic guideline for selecting the potimal load forecast applying to UC problem.

  • PDF

밸브지점 균형과 교환 최적화 방법을 적용한 동적경제급전문제 (Dynamic Economic Load Dispatch Problem Applying Valve-Point Balance and Swap Optimization Method)

  • 이상운
    • 한국인터넷방송통신학회논문지
    • /
    • 제16권1호
    • /
    • pp.253-262
    • /
    • 2016
  • 본 논문은 경제급전 최적화 문제에 균형-교환 방법을 제안하였다. 제안된 알고리즘은 모든 발전기를 가능한한 밸브지점으로 운영한다고 가정한다. 초기치로 최대 발전량 $P_i{\leftarrow}P_i^{max}$로 설정하고, 각 발전기의 밸브지점 $v_k$까지 발전량을 감소시켰을 때의 평균 발전단가 $c_i=\frac{F(P_i)-F(P_{iv_k})}{(P_i-P_{iv_k})}$가 최대가 되는 $_{max}c_i$ 발전기 i의 발전량을 밸브지점 발전단가 $P_{iv_k}$로 감소시켰으며, ${\Sigma}P_i-P_d$ > 0이면 $c_i=F(P_i)-F(p_i-1)$$_{max}c_i$ 발전기 발전량을 $P_i{\leftarrow}P_i-1$로 감소시켜 ${\Sigma}P_i=P_d$의 균형을 맞추었다. 다음으로, $_{min}\{_{max}(P_i-P_i^{min}),\;_{max}(P_i^{max}-P_i)\}$>${\alpha}{\geq}10$의 범위에 대해 "-10" 간격으로 감소시키는 성인걸음법으로, 10>${\alpha}{\geq}1$ 범위에 대해서는 "-1"의 아기걸음법으로, $P_i=P_i{\pm}{\alpha}$에 대한 $_{max}[F(P_i)-F(P_i-{\alpha})]$>$_{min}[F(P_j+{\alpha})-F(P_j)]$, $i{\neq}j$이면 $P_i=P_i-{\alpha}$, $P_j=P_j+{\alpha}$로 발전량을 교환하는 방법으로 최적화를 수행하였다. 다음으로 ${\alpha}=\text{0.1, 0.01, 0.001, 0.0001$에 대해 미세한 교환을 수행하였다. 동적 경제급전 문제의 시험 사례에 제안된 알고리즘을 적용한 결과 기존의 휴리스틱 알고리즘 최적화 발전비용을 크게 감소시켜 경제적인 이익을 극대화 시켰다.

Multi-Area Unit Commitment with Bilateral Contract Approach in Deregulated Electricity Market

  • Selvi, S.Chitra;Devi, R.P.Kumudini;Rajan, C.Christober Asir
    • Journal of Electrical Engineering and Technology
    • /
    • 제4권3호
    • /
    • pp.346-352
    • /
    • 2009
  • The eventual goal of this paper is to help the generating companies and load-serving entities to choose appropriate relative levels of interconnected system versus bilateral trades while considering risk, and economic performance. In competitive power markets, electricity prices are determined by balance between demand and supply in electric power exchanges or bilateral contracts. The problem formulation is bilateral contract incorporated into Multi-area unit commitment with import/export and tie-line constraints. This proposed method considers maximizing own profit or minimize the operating cost among the generating companies in multi-area system. The feasibility of the proposed algorithm has been demonstrated using IEEE system with four areas and experimental results shows that proposed method is reliable, fast and computationally efficient