• 전력전자학회논문지
• /
• 제17권1호
• /
• pp.67-76
• /
• 2012

This paper proposes the aggregated modeling and control of integated boost-flyback converter (IBFC) for understanding of dynamics characteristic and designing of relevant controller. The basic concept of the aggregated modeling is to substitute the boost or the flyback converter with an equivalent current source. Since each converter with equivalent current source corresponds to the basic boost and flyback converters, the overall mathematical process is significantly simplified for the modeling. Afterwards each result is combined to construct the complete model of the IBFC, and the relevant controller is designed through the achieved small-signal model. Simulation and experimental results show excellent agreement with the theoretical expectations.

• 전력전자학회논문지
• /
• 제10권2호
• /
• pp.169-176
• /
• 2005

본 논문에서는 능동 클램프 풀브릿지 Boost 컨버터에 관한 DC 모델링과 AC 모델링 과정에 대하여 기술한다. 동작 원리로부터 이 컨버터의 교류 부분을 등가의 직류 부분으로 바꾸고 반도체 스위치를 재배치하여 개념적인 등가 회로가 유도된다. 유도된 등가회로는 CCM(Continuous conduction mode) Boost 컨버터와 DCM(Discontinuous conduction mode) Buck 컨버터로 표현된다. 유도된 등가회로의 각 스위치 부분을 PWM 스위치 모델로 대체하여 DC 모델 및 AC 모델이 완성된다. 이론적인 DC 및 AC 모델링 결과는 실험이나 SIMPLIS 시뮬레이션을 통해 검증된다.

• 유공압시스템학회논문집
• /
• 제8권4호
• /
• pp.24-31
• /
• 2011

Double-color Injection molding machine is the assembly of many kinds of mechanical, fluid power part and electric electronic control system. From in these, fluid power is a part where becomes the first core of this machine. Fluid power systems of double-color injection molding machine are modelled and analyzed using a commercial program AMESim. Partial system models which is divided according to functional operation are made and its analysis results shows how design parameters work on operational characteristics like pressure, flow rates, displacement at each node and so on. Analysis modeling and compared the data which gets from experiment and the analysis result which has a reliability got data. The results made by analysis will be used design of fluid power circuit for developing a double-color injection molding machine.

• 한국수소및신에너지학회논문집
• /
• 제24권5호
• /
• pp.373-385
• /
• 2013

To obtain higher power efficiency of Residential Power Generation system(RPG), it is needed to operate system on optimized stoichiometric ratios of fuel and air. Stoichiometric ratios of fuel/air are closely related to efficiency of stack, reformer and power consumption of Balance Of Plant(BOP). In this paper, optimizing stoichiometric ratios of fuel/air are conducted through systematic experiments and modeling. Based on fundamental principles and experimental data, constraints are chosen. By implementing these optimum values of stoichiometric ratios, power efficiency of the system could be maximized.

• JSTS:Journal of Semiconductor Technology and Science
• /
• 제10권1호
• /
• pp.11-19
• /
• 2010

Register transfer level power macromodeling is well known as a promising technique for accurate and efficient power estimation. This paper proposes effective approaches based on the tablebased method for the RTL power macro-modeling. The new parameter SD, which characterizes the distribution of switching activities for each gate in the circuit, is one of the contributions. The new parameter SD has strong correlation with power consumption. We also propose an accurate table reference method considering the circuit characteristics. The table reference method is applicable for every table-based method and outputs more accurate power value. The experimental results show that the combination of the proposed methods reduces max error 30.36% in the best case, comparing conventional methods. The RMS error is also improved 1.70% in the best case.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
• /
• 제55권6호
• /
• pp.325-336
• /
• 2006

This paper deals with the dynamic analysis of variable speed wind power systems with doubly-fed induction generators (DFIG). First, the mathematical modeling of wind farm which consists of turbine rotor, DFIG, rotor side and grid side converter and control systems is presented. In particular, the equation for dynamic modeling of the DFIG and the AC/DC/AC converter is expressed as dq reference frame. And then, on the basis of mathematical modeling for each component of wind farm, dynamic simulation algorithms for speed and pitch angle control of wind turbine and generated active and reactive power control of the DFIG and the AC/DC/AC converter are established. Finally, Using the MATLAB/SIMULINK, this paper presents dynamic simulation model for 6MW wind power generation systems with the DFIG considering distribution systems and performs the dynamic analysis of wind power systems in steady state. Moreover, this paper also presents the dynamic performance for the case when the voltage sag in grid source and phase fault in bus are occurred.

• 한국전자통신학회논문지
• /
• 제10권8호
• /
• pp.935-944
• /
• 2015

본 논문에서는 가변속 풍력발전시스템의 동적 모델링과 운전제어 시뮬레이션을 수행하였다. 풍속모델, 풍력터빈과 PMSG 모델, MPPT 및 피치 운전제어 모델 등을 구현하였다. 그리고 상용화된 5MW급 풍력터빈 데이터들을 참고하여 실제적인 시스템과 유사한 출력계수 및 가상 운전 조건으로 시뮬레이션 하였다. 시뮬레이션 결과 정격속도 12[m/s]까지 최대출력계수를 유지하면서 최대전력추종을 확인하였다. 또한 12[m/s]이상의 고속 풍속에서는 동적으로 피치 각도를 제어하면서, 정격상태의 안정적인 출력을 유지하였다.

• 정보학연구
• /
• 제6권3호
• /
• pp.1-10
• /
• 2003

본 논문은 전력선 통신 실험을 보다 빠르고 효율적으로 수행할 수 있는 전력선 채널 모델링에 관한 것이다. 용량성 부하 채널 시뮬레이터는 댁내망 전력선 모뎀 개발에 있어서 필수적인 실험 장비이다. 실제 전력선 채널 환경을 모델링한 이 실험 장비를 이용한 총 245 개의 용량성 부하 채널에 대하여 주파수 응답법에 의한 채널 모델링을 행하였다. 용량성 부하 채널 시뮬레이터를 사용한 실험 데이터 결과와 모델링된 채널 필터를 통과한 결과를 비교하였을 때 큰 오차 없이 실제 전력선 통신상의 용량성 부하 실험을 대체할 수 있음을 확인하였다.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2009년도 제40회 하계학술대회
• /
• pp.95_96
• /
• 2009

In this paper, a new algorithm of Integrated Volt/Var Control (IVVC) is proposed using Volt/Var control for the Distribution Automation System (DAS) based on the modeling of the distributed load and the distributed current. In the proposed, the load flow based on the modeling of the distributed load with Distributed Generation and the distributed current are estimated from constants of four terminals using the measurement of the current and power factor from a Feeder Remote Terminal Unit (FRTU). For Integrated Volt/Var Control (IVVC), the gradient method is applied to find optimal solution for tap and capacity control of OLTC (On-Load Tap Changers), SVR (Step Voltage Regulator), and SC (Shunt Condenser). What is more Volt/Var control method is proposed using moving the tie switch as well as IVVC algorithm using power utility control. In the case studies, the estimation and simulation network have been testified in Matlab Simulink.

• 환경영향평가
• /
• 제9권1호
• /
• pp.61-74
• /
• 2000

This study compares the results of environmental impact assessment with the results of post-environmental investigation, using the case of Taean thermal power plant construction. The atmospheric and water qualities were not greatly changed before and after the construction of the power plant. However, the site of the highest concentration predicted by the atmospheric quality modeling in environmental impact assessment was different from that after operation of 4 power plants. There was also a difference in the diffusion range of thermal discharge water between the measured result(1km) and the predicted value(1.5km) with the model. Thus, environmental impact evaluation should be based on long-term (more than a year) environmental monitoring data. For the modeling of atmospheric quality and numerical thermal discharge water diffusion, appropriate models for each plant should be selected and the numerical modeling should be accompanied by computer simulation, wind tunnel test, etc. Moreover, environmental evaluation should focus more on the degree of impact on surroundings than the prediction of changes in surroundings caused by operation of plants.