• 디지털콘텐츠학회 논문지
• /
• 제10권4호
• /
• pp.633-637
• /
• 2009

본 논문은 소모 전력 계산을 위해 회로를 구현하고자 FPGA 기술 매핑을 위한 소모 전력을 고려한 재사용 모듈 생성 알고리즘과 FPGA 기술 매핑을 위해 사용되는 재사용 모듈에 대해 소모 전력을 고려하여 RT 라이브러리를 생성하는 알고리즘을 제안한다. 소모 전력 계산을 위해 회로를 구현하고자 하는 FPGA를 선정한다. 선정된 FPGA를 구성하고 있는 LUT의 조건을 고려하여 전체 소모 전력이 최소가 되도록 기술 매핑을 수행한다. 이러한 정보를 이용하여 할당된 결과의 모듈들 중에서 주어진 소모 전력에 맞는 모듈을 선정하여 회로를 구현한다.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 1997년도 하계학술대회 논문집 A
• /
• pp.322-325
• /
• 1997

Concerns for wind energy as alternative energy have been highly increased. In this paper, the mechanism between mechanical wind turbine and power generating system is presented to specify the relationship of the energy transfer. Grid-connected DFIG could achieve unity leading power factor, in addition to variable speed operation at the wide sub-synchronous and super-synchronous shaft speed range and also its independent control of torque and reactive power is possible.

• Journal of Power Electronics
• /
• 제13권5호
• /
• pp.798-805
• /
• 2013

This paper presents the control and implementation of the dual-stator-winding induction generator for variable frequency AC (VFAC) generating system. This generator has two sets of stator windings embedded into the stator slots. The power winding produces the VFAC power to feed the loads, and the control winding is connected to the static excitation controller to control the generator for output voltage regulation with speed and load variations. On the basis of the idea of power balance, an instantaneous slip frequency control (ISFC) strategy using the information of both the output voltage and the output power is used in this system. A series of experiments is carried out on a 15 kW prototype for verification. Results show that the system has good static and dynamic performance in a wide speed range, which demonstrates that the ISFC strategy is suitable for this system.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2006년도 추계학술대회 논문집 전력기술부문
• /
• pp.222-224
• /
• 2006

This paper addresses a particle swarm optimization-based approach for solving a generating unit maintenance scheduling problem(GMS) with some constraints. We focus on the power system reliability such as reserve ratio better than cost function as the objective function of GMS problem. It is shown that particle swarm optimization-based method is effective in obtaining feasible schedules such as GMS problem related to power system planning and operation. In this paper, we find the optimal solution of the GMS problem within a specific time horizon using particle swarm optimization algorithm. Simple case study with 16-generators system is applicable to the GMS problem. From the result, we can conclude that PSO is enough to look for the optimal solution properly in the generating unit maintenance scheduling problem.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2000년도 추계학술대회 논문집 학회본부 A
• /
• pp.67-69
• /
• 2000

This paper deals with a method for determining an optimal operation strategy of dispersed generating sources. For effective utilization of dispersed generating sources, it is indispensable to consider their thermal merits in addition to electric power. And then the optimal operation of these sources can be determined easily by the principle of equal incremental fuel cost. This paper presents an priority method to decide the optimal location of those sources in power systems about the whole year. The validity of the proposed algorithms are demonstrated using a model system.

• Journal of Advanced Marine Engineering and Technology
• /
• 제28권2호
• /
• pp.309-314
• /
• 2004

The exhaust gas emission from marine diesel engines is one of the major environmental issues. The authors focus the use of photovoltaic energy for the electric power system on marine ships. This paper proposes an operation method of a photovoltaic/diesel hybrid generating system for a small ship in consideration of the fluctuating photovoltaic power due to solar radiation. The aim of the proposed operation method is to minimize the fuel consumption and storage capacity of the battery. The validity of the proposed control method is shown by the numerical simulation based on the experimental data of the photovoltaic system.

• 전기학회논문지
• /
• 제56권11호
• /
• pp.1892-1902
• /
• 2007

This paper presents a new generating unit maintenance scheduling algorithm considering regional reserve margin and transfer capability. Existing researches focused on reliability of the overall power systems have some problems that adequate reliability criteria cannot be guaranteed in supply shortage regions. Therefore specific constraints which can treat regional reserve ratio have to be added to conventional approaches. The objective function considered in this paper is the variance (second-order momentum) of operating reserve margin to levelize reliability during a planning horizon. This paper focuses on significances of considering regional reliability criteria and an advanced hybrid optimization method based on PSO algorithm. The proposed method has been applied to IEEE reliability test system(1996) with 32-generators and a real-world large scale power system with 291 generators. The results are compared with those of the classical central maintenance scheduling approaches and conventional PSO algorithm to verify the effectiveness of the algorithm proposed in this paper.

• 전기학회논문지
• /
• 제60권3호
• /
• pp.560-565
• /
• 2011

This paper proposes the design of micro energy harvesting system by using thermoplastic polyurethane(TPU), which harvests electric energy from the kinetic energy of pedestrian and drives the desired load, and applied it to the self-generating shoes. Also, we designed the buck-boost converter in discontinuous conduction mode(DCM) which functions as a resistor emulator(RE) such that converter's average input current is proportional to input voltage, and it results in transfer of maximum power to buck-boost converter according to control behavior that converter's input resistance is matched with TPU's internal resistance. Therefore, this paper confirms the validity of proposed control scheme and possibility of application for self-generating shoes, from the obtained characteristic of designed micro energy harvesting system by using a TPU and buck-boost converter in DCM.

• 한국지능시스템학회논문지
• /
• 제21권1호
• /
• pp.55-61
• /
• 2011

10KW 이하의 소형 풍력 발전 시스템은 언덕이나, 공원, 도시와 같은 협소한 지역에 유연하게 설치될 수 있다는 장점으로 인해 신재생에너지 분야에서 지속적인 연구/개발이 이루어지고 있다. 소형 풍력 발전기는 낮은가격, 고신뢰도 및 고성능이 중요시되기 때문에 최대 전력을 추종하기 위한 다양한 기법이 요구된다. 일반적으로 제어기의 출력은 DC 부하에 전원을 공급하기 때문에 48V 배터리에 연결되어 동작된다. 본 논문에서는 소형 풍력 발전 시스템을 위한 FPGA 기반 MPPT 제어기를 제안하고자하며, 제안된 시스템에서의 다양한 MPPT 알고리즘의 성능을 검증하기 위해 NI 사에서 제작된 Compact-RIO 컨트롤러를 사용하였다.

• 전기학회논문지
• /
• 제67권5호
• /
• pp.680-687
• /
• 2018

Because of its predictability of the energy cycle and huge scale power output, the ocean energy from tidal power utilization has always received attention as a great energy source, even though its development cost, including the embankment construction, is so much higher than that of any other energy source. Nevertheless, nowadays many projects are being planned on account of institutional support from the government and the recent advance of construction technology. In Korea, the new industry field operating and managing the tidal power plant has already opened. But we are facing a number of problems for optimal operation of tidal power plant that are a lack of operation experience and a skill of professional management and others. This paper suggests a novel way to determine the starting head of power generation by generating power comparison method For this new method, the paper discusses many factors including changing the volume of the basin, the number of operating turbines and gates and forecasting the tidal amplitude and the characteristic curve of turbine and gate. Finally we verified that it can increase about 2% an annual power generation compared with the conventional method using the original operational function made in the plant design process.