• 전력전자학회:학술대회논문집
• /
• 전력전자학회 2003년도 춘계전력전자학술대회 논문집(2)
• /
• pp.524-527
• /
• 2003

This paper describes control of the grid connected transformer-less type photovoltaic(PV) power conditioning system. which is simpler and more efficient than conventional transformer type systems. With modeling and analysis of PV system, the validity of the control strategy was verified by simulations and experimental results.

• 조명전기설비학회논문지
• /
• 제29권1호
• /
• pp.70-79
• /
• 2015

In this paper, enhanced stand-alone operation and development of Matlab/Simulink model of emergency diesel based hybrid energy system is presented. Simulations based on the remote community or islands were performed for PV-diesel-battery hybrid system. Modeling of PV-diesel-battery integrated system is done to perform under the solar radiation and load conditions on Matlab/Simulink platform. The models of diesel generator unit, battery energy storage system, PV and frequency-power control are developed and simulation studies have been carried out under various conditions using Matlab/Simulink and SimPowerSystem. It is demonstrated that the proposed system can provide reliable and good quality power to the customers in diesel synchronous generator-based hybrid energy systems.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2006년도 제37회 하계학술대회 논문집 A
• /
• pp.519-520
• /
• 2006

In this paper, to evaluate the grid-connected 120kW class Photovoltaic(PV) system performance, as a consisted of solar cells, PCS, 150kVA transformer station. The paper address modeling and analysis of a grid-connected 120kW class photovoltaic generation system(PV system) PSCAD/EMTD and Psim. A PWM voltage source inverter(VIS) and its current control scheme have been implemented. A P&O(Perturbation and Observation) MPPT algorithms technique modeling has been simulated and analysed.

• 전기학회논문지
• /
• 제67권8호
• /
• pp.1031-1039
• /
• 2018

If large-scale PV systems are continuously interconnected to distribution system, customer voltages could violate the allowable voltage limit($220{\pm}13V$) according to reverse power flow of PV system. In order to solve these problems, this paper proposes flexible adoption evaluation algorithm of PV system in distribution system which estimates proper introduction capacity and location of ESS(energy storage system) for keeping customer voltages within allowable voltage limit based on various operating scenarios related with connecting point and capacity of PV system. And also this paper proposes modeling of ESS, SVR(step voltage regulator) and PV system using PSCAD/EMTDC S/W and analyzes characteristics of customer voltages and the adoption ability of PV system in distribution system. From the simulation results, it is confirmed that proposed algorithm is useful for large-scale adoption of PV system in distribution system to maintain customer voltages within allowable voltage limit.

• 전력전자학회:학술대회논문집
• /
• 전력전자학회 2002년도 전력전자학술대회 논문집
• /
• pp.551-554
• /
• 2002

This paper describes a new interactive inverter between a photovoltaic(PV) array and single-phase utility that avoid the bulky input (60Hz) transformer on the AC side. The interface employs a pwm boost converter on the DC side followed by a pwm current-forced single-phase rectifier for injecting the power from the PV array into the mains. The current waveform at the AC side remains sinusoidal and exactly in phase at all time. The circuit also has the advantage of requiring fewer switching device than high-frequency link system. This paper describes modeling of PV array and new system topology. Simulation results on the performance of the connection are also presented.

• 전력전자학회:학술대회논문집
• /
• 전력전자학회 2010년도 하계학술대회 논문집
• /
• pp.77-78
• /
• 2010

As the maximum power operating point(MPOP) of photovoltaic(PV) power systems alters with changing atmospheric conditions, the efficiency of maximum power point tracking(MPPT) is important in PV power systems. Moreover, grid-connected PV system occurs some problems such as voltage inequality and harmonics. Therefore, this paper presents the results of a grid-connected PV system modeling by PSIM simulator and investigates the influence on the grid-connected PV system from aspect of power quality, i.e. voltage drop. This paper includes four MPPT algorithms; Perturbation & Observation(P&O), Improved P&O, Increment Conductance(Incond), Hysterisis simulated with irradiation changing.

• 조명전기설비학회논문지
• /
• 제23권1호
• /
• pp.41-48
• /
• 2009

본 논문은 DC 전동기에 공급되는 PV 시스템의 최대전력점추적에 대한 신경회로망 제어기를 제시한다. 다양한 일사량은 PV 시스템의 MPPT에 대하여 가장 중요한 요소이다. 일사량은 비선형적, 비주기적이고 복잡하다. 신경회로망은 복잡한 수학적 문제를 해결하는데 광범위하게 사용되고 있다. 제안한 태양광 발전시스템은 신경회로망 제어기, DC-DC 컨버터, DC전동기, 부하로 구성되어 있다. 신경회로망 알고리즘은 컨버터의 쵸핑비를 계산하고 DC-DC 컨버터에 적용된다. 신경회로망의 출력은 수학적 모델링에 의해 계산된 값과 비교하고 알고리즘의 타당성을 제시한다.

• 한국화재소방학회논문지
• /
• 제24권2호
• /
• pp.52-57
• /
• 2010

비상발전용 전원으로 많이 사용되고 있는 전동기시스템은 비상 발전 시 외에는 거의 사용하지 않고 있어 비효율적이다. 반면에, 태양광 발전시스템을 이용하면 평상시 전력을 저장하여 계통 연계형 시스템으로 사용할 수 있어 많은 활용도가 있다. 본 논문에서는 범용 시뮬레이터인 PSPICE를 이용하여 시뮬레이션을 수행 할 수 있도록 PV시스템에 사용되는 각종 모델들을 라이브러리화 하였다. 또한 비상발전용 전원으로 사용하기 위한 태양광 시스템의 특성을 모델링하고 설계 해석하여 실제 사용하는데 효과적인 장치를 만들수 있음을 확인하였다.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2002년도 하계학술대회 논문집 B
• /
• pp.1345-1347
• /
• 2002

This paper describes the computer simulation results of the photovoltaic(PV) power system for the grid-connection. The major contents of this paper consist of the modeling of the PV power system for grid-connection, the analysis of the steady-state characteristics of the system, and the analysis of the transient-state characteristics of the system, respectively.

• Journal of Power Electronics
• /
• 제19권5호
• /
• pp.1259-1269
• /
• 2019

PV system performance is dependent on different irradiations and temperature values in addition to the capability of the employed PV inverter / maximum power point tracker (MPPT) circuit or algorithm. Therefore, it would be appropriate to use a PV simulator capable of producing identical repeatable conditions regardless of the weather to evaluate the performance of inverter / MPPT circuits and algorithms. In accordance with this purpose, a photovoltaic (PV) array simulator is presented in this paper. The simulator is designed to generate current-voltage (I-V) and power-voltage (P-V) curves of a PV panel. Series connected cascaded modules constitute the basic part of the simulator. This feature also allows for the modeling of PV arrays since the number of modules can be increased and high voltage values can be reached with the simulator. In addition, the curves obtained at the simulator output become similar to the actual curves of sample PV panels with an increase in the number of modules. In order to show the validity of the proposed simulator, it was simulated for various situations such as panels under full irradiance and partial shading conditions. After completing simulations, experiments were realized to support the simulation study. Both simulation and experimental results show that the proposed simulator will be very useful for researchers to carry out PV studies under laboratory conditions.