• 한국농촌건축학회논문집
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• 제23권1호
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• pp.9-18
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• 2021

In this study, surveys and data collection on new profit-sharing measures were carried out in order to improve the residential environment and residents' participation in 65 MW large-scale solar power complex located at Munhye 5-ri, Galmal-eup, Cheorwon-gun, Gangwon-do province. From May to September 2018, the presentation and meetings for residents were held and a survey for 67 households were carried out in order to collect profit-sharing data which is sharing profits from solar power project improving residential environment. The results of the survey shows that it needs to improve some obstacles of residential environment in rural areas, such as improvement of living infrastructure at village level, improvement of monotonous leisure activities from the residents' point of view, improvement of economic income sources depending on farm income and Basic Old-age Pensions, inconvenience factors in the unsuitable residential environment due to aging. Based on these findings, this paper suggests that Profit-Sharing solar power complex project has possibilities to improve living environment in rural areas by sharing profits from power generation and residents participating in the project with consensus for need of renewable energy.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2007년도 하계학술대회 논문집
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• pp.175-177
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• 2007

An analysis on a passive current sharing characteristics of a multi-phase synchronous buck converter is presented. The passive current sharing method is simple but its characteristics depend on the converter equivalent resistance and PWM uniformity. In this paper, the load sharing and power consumption of the passive current sharing system for the converter equivalent resistance and duty ratio inequalities are investigated through the simulation and experiment.

• Journal of Electrical Engineering and Technology
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• 제12권4호
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• pp.1575-1585
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• 2017

This paper presents a synchronous generator with a distributed system of multiple parallel three-phase power cells. This generator can immediately output high DC. Each power cell comprises three-phase windings and a three-phase synchronous rectification bridge with a deadbeat control of load power feedforward, which can improve the characteristics of dynamic response and reflect the load variance in real time. Furthermore, each power cell works well independently and modularly using the method of automatic maximum current sharing. The simulation and experimental results for the distributed controller of multiple power cells demonstrate that the deadbeat control method can respond quickly and optimize the quality of the energy. Meanwhile, automatic maximum current sharing can realize the validity of current sharing among power cells.

• 대한전자공학회논문지SD
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• 제40권7호
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• pp.532-541
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• 2003

메모리에서의 대부분의 전력은 프리디코더 라인, 워드 라인, 그리고 비트 라인 등과 같은 커패시턴스가 큰 라인들에서 소모된다. 이 라인들에서의 전력 소모를 줄이기 위하여 전하 재활용과 전하 공유를 사용한 세 가지 기법들이 제안되었다. 이 기법들은 전하 재활용 프리디코더(charge recycling predecoder, CRPD), 전하 재활용 워드 라인 디코더(charge recycling word line decoder, CRWD), 그리고 롬을 위한 전하 공유 비트 라인(charge sharing bit line, CSBL)이다. CRPD와 CRWD는 프리디코더 라인과 워드 라인의 전하를 재활용하여 소모 전력을 반으로 줄여주고, 전하 공유 기법을 사용하는 CSBL은 롬 비트라인의 스윙 전압을 낮춤으로써 소모 전력을 크게 줄여준다. CRPD, CRWD, 그리고 CSBL의 소모 전력은 기존의 82%, 72%, 그리고 64%이다. 제안된 세 가지 기법들을 사용하는 전하 재활용 전하 공유 롬(charge recycling and charge sharing ROM, CRCS-ROM)이 0.35㎛ CMOS공정으로 제작되었다. 제작된 8K×16비트 CRCS-ROM의 코어 크기는 0.51㎟이고 3.3V 전원과 100㎒ 동작 주파수에서 8.63㎽ 을 소모하였다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2019년도 전력전자학술대회
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• pp.115-117
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• 2019

In this paper, an intelligent control scheme based on Fuzzy PID controller is proposed for accurate power sharing in DC Microgrid. The proposed Fuzzy PID controller is designed with the aid of a closed loop control based on per unit power of each distributed generator (DG), and accurate power sharing is successfully realized in proportional to each DG's power rating regardless of the line resistance difference or the load change. Thanks to Fuzzy PID controller, the dynamic response becomes faster and the stability of the microgrid system are improved in comparison to conventional PID controller. The superiority of the proposed method is analyzed and verified by simulation in Matlab and Simulink.

• JSTS:Journal of Semiconductor Technology and Science
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• 제14권5호
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• pp.549-556
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• 2014

This paper proposes a highly power-efficient single-inductor multiple-outputs (SIMO) DC-DC converter with a gate charge sharing method in which gate charges of output switches are shared to improve the power efficiency and to reduce the switching power loss. The proposed converter was fabricated by using a $0.18{\mu}m$ CMOS process technology with high voltage devices of 5 V. The input voltage range of the converter is from 2.8 V to 4.2 V, which is based on a single cell lithium-ion battery, and the output voltages are 1.0 V, 1.2 V, 1.8 V, 2.5 V, and 3.3 V. Using the proposed gate charge sharing method, the maximum power efficiency is measured to be 87.2% at the total output current of 450 mA. The measured power efficiency improved by 2.1% compared with that of the SIMO DC-DC converter without the proposed gate charge sharing method.

• Journal of Power Electronics
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• 제19권1호
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• pp.234-243
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• 2019

Studying the control strategy of a microgrid under the load unbalanced state helps to improve the stability of the system. The magnitude of the power fluctuation, which occurs between the power supply and the load, is generated in a microgrid under the load unbalanced state is called negative sequence reactive power $Q^-$. Traditional power distribution methods such as P-f, Q-E droop control can only distribute power with positive sequence current information. However, they have no effect on $Q^-$ with negative sequence current information. In this paper, a stationary-frame control method for power sharing and voltage unbalance compensation in islanded microgrids is proposed. This method is based on the proper output impedance control of distributed generation unit (DG unit) interface converters. The control system of a DG unit mainly consists of an active-power-frequency and reactive-power-voltage droop controller, an output impedance controller, and voltage and current controllers. The proposed method allows for the sharing of imbalance current among the DG unit and it can compensate voltage unbalance at the same time. The design approach of the control system is discussed in detail. Simulation and experimental results are presented. These results demonstrate that the proposed method is effective in the compensation of voltage unbalance and the power distribution.

• 대한전자공학회논문지SD
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• 제41권5호
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• pp.99-105
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• 2004

더미 비트라인을 이용한 공유 커패시터 전하공유 롬(shared-capacitor charge-sharing ROM SCCS-ROM)이 제안되었다. SCCS-ROM은 기존의 전하공유 롬(charge-sharing ROM, CS-ROM)의 전하공유 기법으로 비트라인의 스윙전압을 줄였다. CS-ROM에서는 출력 비트 마다 3개의 작은 커패시턴스들이 필요하지만, 제안된 SCCS-ROM은 그 커패시터들을 공유함으로써 필요한 커패시터의 수를 단지 3개로 줄였다. 또한, 더미 비트라인들(dummy bit lines)로 커패시터들을 구현함으로써, 잡음내성을 증가시켰을 뿐만 아니라 소모전력 또한 줄였다. 8K×15bi1s의 SCCS-ROM이 0.35㎛ CMOS 공정으로 구현되었다. SCCS-ROM은 3.3V의 100㎒ 동작에서 8.63㎽의 전력을 소모하였다. 시뮬레이션에서 SCCS-ROM은 CS-ROM보다 8.4% 적은 전력을 소모하였다.

• Journal of Power Electronics
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• 제16권6호
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• pp.2315-2326
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• 2016

This paper discusses the elimination of DC voltage deviation and the enhancement of load current sharing accuracy in multi-terminal high voltage direct current (MT-HVDC) systems. In order to minimize the power line losses in different parallel network topologies and to insure the stable operation of systems, a decentralized control method based on a modified droop control is presented in this paper. Averaging the DC output voltage and averaging the output current of two neighboring converters are employed to reduce the congestion of the communication network in a control system, and the decentralized control method is implemented. By minimizing the power loss of the cable, the optimal load current sharing proportion is derived in order to achieve rational current sharing among different converters. The validity of the proposed method using a low bandwidth communication (LBC) network for different topologies is verified. The influence of the parameters of the power cable on the control system stability is analyzed in detail. Finally, transient response simulations and experiments are performed to demonstrate the feasibility of the proposed control strategy for a MT-HVDC system.

• Journal of Power Electronics
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• 제15권2호
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• pp.399-410
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• 2015

A 6.5 V/50 kA high-frequency switching power supply (HSPS) system composed of 10 power modules is developed to meet the requirements of copper-foil electrolysis. The power module is composed of a two-leg pulse width modulation (PWM) rectifier and a DC/DC converter. The DC/DC converter adopts two full-wave rectifiers in parallel to enhance the output. For the two-leg PWM rectifier, the ripple of the DC-link voltage is derived. A composite control method with a ripple filter is then proposed to effectively improve the performance of the rectifier. To meet the process demand of copper-foil electrolysis, the virtual impedance-based current-sharing control method with load current full feedforward is proposed for n-parallel DC/DC converters. The roles of load current feedforward and virtual impedance are analyzed, and the current-sharing control model of the HSPS system is derived. Virtual impedance is used to adjust the current-sharing impedance without changing the equivalent output impedance, which can effectively reduce current-sharing errors. Finally, simulation and experimental results verify the structure and control method.