• 제목/요약/키워드: Generating power

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에너지회생스너버를 적용한 하이브리드 3레벨 DC/DC 컨버터 (Hybrid Three-Level DC/DC Converter using an Energy Recovery Snubber)

  • 허예창;주종성;말론;김은수;강철하;이승민
    • 전력전자학회논문지
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    • 제22권1호
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    • pp.36-43
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    • 2017
  • This paper describes a hybrid multi-output three-level DC/DC converter suitable for a wide, high-input voltage range of an auxiliary power supply for a high-power photovoltaic generating system. In a high-power photovoltaic generating system, the solar panel output voltage depends on solar radiation quantity and varies from 450Vdc to 1100Vdc. The proposed hybrid multi-output three-level DC/DC converter, which is an auxiliary power supply, would be used as power source for control printed circuit boards and relay and cooling fans in a high-power photovoltaic generating system. The proposed multi-output ($24V_{DC}/30A$, $230V_{DC}/5A$) hybrid three-level boost converter, which uses an energy recovery snubber, is controlled by variable-frequency and phase-shifted modulations and can achieve zero-voltage switching with all operating conditions of input voltage and load range. Experimental results of a 2kW prototype are evaluated and implemented to verify the performance of the proposed converter.

태양광 모듈의 미스매치를 고려한 새로운 최대전력 추종제어 알고리즘 연구 (A Novel Maximum Power Point Tracking Algorithm Considering the partially shaded in PV generating system)

  • 심재휘;최주엽;최익;이상철;이동하
    • 한국태양에너지학회 논문집
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    • 제32권spc3호
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    • pp.220-227
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    • 2012
  • The maximum power point tracking(MPPT) is important part pf PV generating system, because of nonlinear characteristic of PV array. Many MPPT algorithms have been developed and proposed, but partially shaded in PV generating system, these algorithms can not track maximum power point. This paper explains the partially shaded conditions in the PV generating system and describes a novel new MPPT algorithm. To verify the proposed novel algorithm, PSIM simulation tool is used in this paper, and proper 3kW PV module modeling is made. As a result, the right maximum power point(11PP) of PV PCS can be tracked directly under shading effect for any mismatched condition in solar array.

전력계통에 있어서 분산형 연료전지 발전시스템의 최적 도입계획에 관한 연구 (A Study on the Optimal Planning for Dispersed Fuel Cell Generation Systems in Power Systems)

  • 노대석;심헌;오용택;최재석;차준민
    • 대한전기학회논문지:전력기술부문A
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    • 제50권6호
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    • pp.265-274
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    • 2001
  • Recently, the operation of power systems has become more difficult because the peak demand load is increasing continuously and the daily load factor is getting worse and worse. Also, the consideration of deregulation and global environment in electric power industry is required. In order to overcome those problems, a study on the planning and operation in power systems of dispersed generating sources such as fuel cell systems, photovoltaic systems and wind power systems, has been performed energetically. This paper presents a method for determining an optimal operation strategy of dispersed co-generating sources, especially fuel cell generation systems, considering thermal supply as well as electric power supply. In other words, the optimal operation of those sources can be determined easily by the principle of equal incremental fuel cost and the thermal merit of those sources can be also evaluated quantitatively through Kuhn-Tucker's optimal conditions. In additions, an priority method using the comparison of total cost at the peak load time interval is presented in order ot select the optimal locations of those sources. The validity of the proposed algorithms is demonstrated using a model system.

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시화조력발전소 방류 수문을 활용한 조류발전이 조력발전에 미치는 영향 (Effect of tidal current turbine using the discharge gate of Siwha tidal power plant on the tidal power generating)

  • 김영준;김용열;조용;고재명
    • 한국신재생에너지학회:학술대회논문집
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    • 한국신재생에너지학회 2010년도 춘계학술대회 초록집
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    • pp.236.2-236.2
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    • 2010
  • The tidal current power is the power plant by installing the turbine or rotor where the tidal speed is fast. This system converting the horizontal movement to rotating energy. Tidal power turbine is needed for the dam to utilize the pressure difference. However, tidal current power using the only flow. The tidal current power was evaluated as the impact on the marine environment surrounding was less and the development of eco-friendly way. In this article, we calculated the effect of tidal current turbine on the tidal power generating by mean of CFD. With these calculated results, we checked the possibility of tidal current power using tidal power plant the discharge gate.

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수력발전소 IED의 디지털 보호 알고리즘에 관한 연구 (A Study on Digital Protection Algorithm of IED for Hydroelectric Generating Unit)

  • 박철원
    • 전기학회논문지P
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    • 제63권3호
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    • pp.149-156
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    • 2014
  • Generator of hydroelectric generating unit is to be protected by the digital protection IED. Now, any IED of large capacity for hydro power plant was not developed by domestic technology. This is because it is required for the generator of the high reliability technology and considered as due to the sale of the market of IED device is small. However, the protection IED must be develop by domestic technology to meet the advanced needs of the construction and replacement of electrical equipment in accordance with the new power plant development. In this paper, a digital algorithms for protection IED of large size of hydroelectric generating unit were designed. The algorithms consist of the stator protection, anti-motoring, overexcitation and loss of excitation. The performance of the algorithms were evaluated by using the simulation data collected from the PSCAD/EMTDC software. From test results, it can be seen that the developed algorithms were not maloperation.

동적계획법을 이용한 선내 발전시스템의 최적부하분담 방법에 관한 연구 (A Study on Optimal Electric Load distribution of Generators on board using a Dynamic Programming)

  • 유희한
    • Journal of Advanced Marine Engineering and Technology
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    • 제24권3호
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    • pp.106-112
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    • 2000
  • Since the oil crisis, we have been concerned about the energy saving techniques of electric generating systems. As a part of the effort to save energy, automatic electric load sharing device was developed. Usually, ship's electric generating system consists of two or three sets of generator. And, electric generating system is operated as single or parallel operation mode according to the demanded electric power. Therefore, it is important to investigate generators operating mode for the supply of required electric power in the ship in order to decrease the operating cost. So, this paper suggests the method to solve the optimal electric load distribution problem by dynamic programming. And, this thesis indicates that the proposed method is superior to the lagrange multiplier's method in obtaining optimal load distribution solution in the ship's electric generating system.

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선로용량한계를 고려한 단기 발전계획 (Short-Term Generation Scheduling Considering Transmission Line Capacity Limits)

  • 김준현;송현선;유인근
    • 대한전기학회논문지
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    • 제35권12호
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    • pp.594-602
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    • 1986
  • This paper proposes an effective algorithm for short-term generation scheduling for the purpose of economic and secure operation of thermal power systems. Especially, in the procedure of solution by Dynamic Programming, Linear Programming is introduced to promote the possibility of optimal solution and the security of power systems, and evaluation of security function is improved by the application of seven step approximation of normal distribution. Several necessary considerations, that is, time dependent start-up and constant down cost of generating units, demand and spinning reserve constraints, minimum up and sown time constraints, the number of possible start-up of a generating unit in a d and the number of generating units which can be started up at the same time at the same bus, are also incoporated to elevate the usability and flexibility of the algorithm. Finally, the effectiveness of the proposed algorithm has been demonstrated by applying to the 6-gen. 21-bus model power system.

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복합화력발전기의 신뢰도 기반 유지보수를 위한 확률론적 FMECA 평가 (Stochastic FMECA Assessment for Optimal RCM of Combustion-Turbine Generating Unit)

  • 주재명;이승혁;신준석;김진오
    • 전기학회논문지
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    • 제56권2호
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    • pp.254-259
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    • 2007
  • PM(Preventive Maintenance) can avail the generating unit to reduce cost and gain more profit in a competitive supply-side power market. So, it is necessary to perform reliability analysis on the power systems in which reliability is essential. Thus, to schedule optimal PM planning based on reliability that is defined RCM(Reliability-Centered Maintenance), FMECA(Failure Mode Effects and Criticality Analysis) assessment is very important. Therefore, in this paper, the procedure of FMECA assessment for optimal RCM is proposed by probabilistic approach using real historical failure data of combustion-turbine generators in Korean power systems. The stochastic FMECA is performed based on the effects of probable failure modes of combustion-turbine generating unit.

풍력발전을 위한 이중여자 유도기의 센서리스 제어

  • 김용현;김일환
    • 전력전자학회논문지
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    • 제5권5호
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    • pp.451-458
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    • 2000
  • 이중여자 유도기를 계통선 연계형 풍력발전 시스템에 적용할 때, 고정자는 계통선에 그리고 회전자는 제어 시스템에 연결된다. 이때 고정자에는 일정전압과 주파수가 걸리기 때문에, 고정자측에 는 거의 일정한 고정자 자속값을 갖는다. 또한 고정자 자속을 기준으로 고정자 전류와 회전자 전류를 이용하여 슬립각을 추정하고, 이를 이용하여 고정자측에 출력되는 전력을 제어한다. 제안한 알고리즘의 타당성을 검증하기 위해 컴퓨터 시뮬레이션과 실험을 통하여 이를 입증한다.

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윈도우환경을 기반으로 한 최적전력조류 프로그램 팩키지 개발 (Windows Based Programming for Optimal Power Flow Analysis)

  • 김규호;이상봉;이재규;유석구
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2001년도 추계학술대회 논문집 전력기술부문
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    • pp.239-242
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    • 2001
  • This paper presents a windows program package for solving security constrained OPF in interconnected power systems, which is based on the combined application of evolutionary programming(EP) and sequential quadratic programming(SQP). The objective functions are the minimization of generation fuel costs and system power losses. The control variables are the active power of the generating units, the voltage magnitude of the generator, transformer tap settings and SVC setting. The state variables are the bus voltage magnitude, the reactive power of the generating unit, line flows and the tie line flow. In OPF considering security, the outages are selected by contingency ranking method. The resulting optimal operating point has to be feasible after outages such as any single line outage(respect of voltage magnitude, reactive power generation and power flow limits). The OPF package proposed is applied to 10 machines 39 buses model system.

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