• 한국태양에너지학회 논문집
• /
• 제36권5호
• /
• pp.19-30
• /
• 2016

In this study, realize voltage regulation $220Vac{\pm}10%$ or less, frequency fluctuation $60Hz{\pm}1%$ or less over the independent operation and grid-connected operation technologies for power stabilization relates to the ESS designed and manufactured in conjunction with solar installations and solar to compensate the output reduction due to the polarization of the solar module through the polarization prevention technology for preventing the optical module efficiency is lowered, in conjunction with the BMS inverter efficiency was more than 92%, more than 90% of the charging efficiency to the target. This study was designed in conjunction with the ESS solar power plants, grid-connected operation and independent operation, Peak-Cut, it can stabilize the grid via the Peak-Shifting operation

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2010년도 춘계학술대회 논문집
• /
• pp.151-156
• /
• 2010

모노레일은 전철의 최첨단 시스템을 적용하여 버스 규모의 크기로 운용할 수 있는 중소형 교통수단으로서 각 장치들에 대한 소형, 경량화가 무엇보다 중요하다. 세계 최초로 도입한 중앙 안내 방식의 도심관광형 월미모노레일 또한 소형, 경량화 된 장치들로 구성되어있으며, 특히 열이 많이 발생하는 추진 시스템(인버터, 모터)을 소형, 경량화 하기 위해 집중적인 연구와 시험이 이루어졌다. 본 연구에서는 고효율의 추진 시스템을 소형, 경량화 할 수 있는 수냉식 냉각 구조 및 방법에 관한 해법연구와 함께 에너지 절감에 효과적인 제어방식을 제시하였다.

• 한국시스템다이내믹스연구
• /
• 제5권1호
• /
• pp.49-71
• /
• 2004

Demand-side Management can be defined as'any utility activity aimed at modifying customers' use of energy to produce desired changes in the utility's load shape'. Customers benefit by being able to control energy costs and improve quality of life and become more productive. Utilities benefit from DSM's value as a resource that enhances asset utilization and reduces both fuel costs and environmental emissions. The scope of DSM includes load management through rate schedules and conservation by improving energy effciency and using electricity consumption effectively. This paper study the DSM resource evaluation and customer behavior analysis todesign the DSM Program plan in response to customer needs. We develop basic system dynamics model to analysis the customer behavior based on a survey research. The DSM Program participants in the Hi- efficiency Inverter, Electric motor and efficient lighting applicancies operating by Conservation program 2002 become the survey objects. DSM resource evaluation evaluate firstt the distribution potentialities of each machine and then forecast the degree of diffusion. We apply the system dynamic approach to simulate the dynamic DSM market situation at the domestic beginning. This model will give the energy Planner the opportunity to create different scenarios for DSM program planning. Also it will lead to increased understanding of the dynamic DSM market

• Journal of Welding and Joining
• /
• 제19권6호
• /
• pp.622-629
• /
• 2001

The aim of this experiment is to establish the method that obtains symmetrically two nuggets in microresistance series spot welding. The sheets of austenite stainless steel STS304 applied to various electronic parts were experimented by the inverter welding power source of polarity controllable type and by the twin head for left and right electrode force to be controlled separately. The experimental results were obtained as follows : 1) When series spot welding was carried out by DC 1 pulse as welding current with same electrode force at left and right, the asymmetry of nuggets was resulted from the larger nugget of the (-) pole because of the Peltier effect. The dynamic resistance of weld spot at left and right was appeared differently according to the growth of nuggets. 2) When AC 1 cycle by welding power source of polarity controllable type was applied, the nuggets were almost symmetrically formed. 3) In a twin head, if the electrode force of (-) pole was larger than that of (+) pole, the diameters of two nuggets became to same. It was confirmed that the dynamic resistance of (-) pole was decreased to the same level as it of (+) pole. 4) Although the forces of left and right electrode were same, and only DC 1 pulse was applied, symmetric nuggets were obtained if the conductivity of (+) pole was lower than it of (-) pole.

• 전기학회논문지
• /
• 제58권1호
• /
• pp.86-92
• /
• 2009

This paper presents development of 6kw ZVS(Zero Voltage Switching) boost converter by 4-parallel operation. To realize a high capacity converter with 6 kw, 4-parallel operation of 1.5kW unit module is proposed in this paper. To meet high ratio input to output voltage, isolated type booster converter is designed. To achieve ZVS operation of 4-switches of full bridge and protect a voltage overshoot caused by switch turn-off, simple active-clamp circuit is applied to the primary side. For parallel operation of 4-modules, master-slave control method is proposed to achieve input current sharing of 4-unit converter modules accurately. For performance tests, simulation is carried out. Also, load and experimental tests of the developed booster converter, 230Vdc/6kW, are carried out under various conditions. For field tests, the developed converter is applied for boosting a battery power to high DC_link voltage for a VSI inverter which starts a micro-turbine(MT) installed in vehicle and it's performance is verified through high speed motoring a MT up to tens of thousands of rpm.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2008년도 제39회 하계학술대회
• /
• pp.888-889
• /
• 2008

본 논문은 직류단 전원(DC link)에 대용량의 전해 캐패시터(Electrolytic capacitor)를 사용하지 않는 전해 캐패시터리스 (Electrolytic-Capacitorless) 인버터의 입력 전류와 직류단 전원 공진(resonance) 억제에 대한 것이다. 직류단 전원의 순시적인 에너지원으로 사용되는 전해 캐패시터를 사용하지 않는 캐패시터리스 인버터는 기존의 인버터에 비해서 가격, 부피 면에서 장점을 가지지만, 직류단 전원의 캐패시터 용량이 작아서 부하 단 스위칭의 영향이 입력 전류에 직접적으로 나타나게 된다. 이에 따라서 캐패시터리스 인버터는 필연적으로 입력 단에 저역 통과 필터(Low Pass Filter : LPF)가 필요하다. 입력 단의 필터는 간단한 구조와 가격적 측면을 고려하여 LC 필터가 주로 사용되는데, LC필터는 직류단 전류에 의한 공진의 원인이 된다. 본 논문에서는 캐패시터리스 인버터의 입력 필터의 영향을 분석하여 입력 전류와 직류단 전압의 공진을 억제 할 수 있는 방법을 제시하고, 실험 결과를 통하여 제안된 방법의 유효성을 확인한다.

• 전력전자학회논문지
• /
• 제6권2호
• /
• pp.158-163
• /
• 2001

PWM 모드로 동작하는 전류형 인버터(CSI)는 구형파 제어형 CSI에 비해 구조가 복잡하여 가격이 비싸지고 공진발생 가능성이 크며 스위칭 손실, EMI등에 의해 동작 효율이 낮다. 그러나 구형파 제어모드의 CSI는 출력전류에 저차 고조파가 다량으로 함유되어 있기 때문에 모터의 토크 맥동이 발생된다. 따라서 본 연구에서는 CSI구동 유도 모터의 토크 맥동을 감소하기 위해, CSI와 유도모터 사이에 능동전력필터를 설피하여 유도모터의 입력전류에 함유되어 있는 고조파 성분을 보상하는 시스템을 제안하였다. 고조파를 보상하기 위한 알고지름으로는 연산과정에 전압이 필요치 않는 노치 필터법을 사용하였으며 PSIM 시뮬레이션에 의해 제안된 시스템의 타단성을 입증할 수 있었다.

• 전력전자학회:학술대회논문집
• /
• 전력전자학회 2003년도 춘계전력전자학술대회 논문집(2)
• /
• pp.872-875
• /
• 2003

This paper introduces the propulsion system for Korean High Speed Railway(HSR). The developed propulsion system consists of PWM AC/DC converter and inverter. Compared with TGV-K, converters can improve input harmonics characteristics by the interlaced PW switching methods. And several merits such as unity power factor and simple regenerative operations can be also made. As a main power component, IGCT stack with suitable structure for high speed train and environmentally friendly cooling heat pipe is designed. In this paper, overall configuration of controller and control scheme is briefly described. Finally running tests are made to verify the developed propulsion system. The presented test results shows fast torque response, balanced converter current sharing, and appropriate running sequence.

• 전력전자학회:학술대회논문집
• /
• 전력전자학회 2003년도 추계학술대회 논문집
• /
• pp.247-251
• /
• 2003

The developments of the hybrid energy are necessary since the future alternative energies that have no pollution and no limitation are restricted. Currently power generation system of MW scale has been developed. However, even photovoltaic system cannot always generate stable output with ever-changing weather condition. In this paper, sub power generator for hybrid system(photovoltaic 500[W], wind power generation 400[W]) was suggested. Sub power Generator that uses elastic energy of spiral spring to photovoltaic system was also added for the present system. In an experiment, when output of photovoltaic system gets lower than 24[V] (charging voltage), power was continuously supplied to load through the inverter by charging energy obtained from generating rotary energy of spiral spring operates In DC generator. Also, control algorithm of sub power generator is used genetic algorithm(GA).

• Journal of Power Electronics
• /
• 제2권3호
• /
• pp.220-229
• /
• 2002

In this paper, maximum efficiency operation of two types of permanent magnet synchronous motor drives, namely; surface type permanent magnet synchronous machine (SPMSM) and interior type permanent magnet synchronous motor(IPMSM), are investigated. The efficiency of both drives is maximized by minimizing copper and iron losses. Loss minimization is implemented using flux weakening. A neural network controller (NNC) is designed for each drive, to achieve loss minimization at difffrent speeds and load torque values. Data for training the NNC are obtained through off-line simulations of SPMSM and IPMSM at difffrent operating conditions. Accuracy and fast response of each NNC is proved by applying sudden changes in speed and load and tracking the UC output. The drives'efHciency obtained by flux weakening is compared with the efficiency obtained when setting the d-axis current component to zero, while varying the angle of advance "$\vartheta$" of the PWM inverter supplying the PMSM drive. Equal efficiencies are obtained at diffErent values of $\vartheta$, derived to be function of speed and load torque. A NN is also designed, and trained to vary $\vartheta$ following the derived control law. The accuracy and fast response of the NN controller is also proved.so proved.