• Proceedings of the KIPE Conference
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• 2011.07a
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• pp.302-303
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• 2011

일반적인 승압 컨버터와 H-bridge 인버터로 구성되는 비절연 계통연계형 태양광 인버터 시스템의 효율을 높이기 위해 H-bridge의 스위칭에 적합한 Unipolar 스위칭 방식을 선정하고, 또 SiC 다이오드를 사용함으로써 전체 효율을 향상시켰으며 이를 시뮬레이션과 실험으로 보여준다.

• Proceedings of the KIEE Conference
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• 2001.07b
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• pp.1281-1283
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• 2001

An investigation into power conditioners that interface with photovoltaic array and utilities has been completed. The rating for this investigation is residential system(3-5kW) that interface with a 220V single phase utility connection. As the result of this investigation, a 3kW high frequency PWM IGBT inverter feeding a high frequency isolation transformer with a sinusoidal current wave was selected. The output of the transformer rectified with a diode bridge rectifier four IGBT, used as 60Hz switched, reverse the polarity of the rectified current on every other half cycle of the utility voltage. Even though the high frequency link system used more power semiconductors a net size, weight, and parts cost saying result compared to the other systems due to elimination of 60Hz transformer.

• Proceedings of the KIPE Conference
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• 2014.11a
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• pp.101-102
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• 2014

본 논문에서는 10kW급 태양광발전용 계통연계형 무변압기 방식 인버터의 출력필터로 사용되는 인덕터의 코어별 3종에 대하여 스위칭 주파수 10kHz에 적합한 출력필터용 인덕터를 선정하고 온도특성 따른 영향을 비교하고자 실험을 통하여 정격시 출력전압 및 출력전류의 값, 왜형율, 역률, 인버터의 전력 변환 효율 및 코어의 철손온도와 권선의 동손온도를 측정하여 정량적으로 비교하였다. 또한, 실험 결과를 참고로 하여 인덕터의 코어뿐만 아니라 권선방식과 인덕턴스를 확보하기 위한 방안도 비교하였다.

• Proceedings of the KIPE Conference
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• 2014.11a
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• pp.77-78
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• 2014

태양광시장의 확대 및 발전효율 향상에 따른 요구에 따라 다양한 태양광광시스템이 제안되어 운영되고 있으며, 대용량의 경우에는 중앙집중식이 선호되고 있다. 하지만, 중소용량의 태양광발전 시스템에서는 스트링 방식 또는 멀티스트링 방식이 선호되고 있으며. 추가적으로 모듈단위의 태양광 시스템에 대해 여러 가지 형태의 구조가 제안되고 있다. 본 논문에서는 태양광 마이크로 인버터의 기술개발 동향을 소개하고, 당사에서 개발하고 있는 마이크로인버터의 특징을 소개한다.

• Journal of information and communication convergence engineering
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• v.7 no.2
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• pp.107-112
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• 2009

Renewable energy resources will be an increasingly important part of power generation in the new millennium. Besides assisting in the reduction of the emission of greenhouse gases, they add the much needed flexibility to the energy resource mix by decreasing the dependence on fossil fuels. Due to their modular characteristics, ease of installation and because they can be located closer to the user, PV system have great potential as distributed power source to the utilities. In this paper, a dc-de power converter scheme with the push-pull based technology is proposed to apply for solar power system which has many features such as high efficiency, stable output, and low acoustic noises, DC-DC converter is used in proposed topology has stable efficiency curve at all load range and very high efficiency characteristics. This paper presents the design of a single-phase photovoltaic inverter model and the simulation of its performance.

• Proceedings of the KIEE Conference
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• 2003.07e
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• pp.149-153
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• 2003

This paper presents a current-source-inverter based on a buck-boost configuration and its application for residential photovoltaic system. The proposed circuit has five switches. Among them, only one switch acts as chopping, and the other determine the polarity of output; therefore, it can reduce the switching loss. Because the input inductor current is operated on the discontinuous conduction mode, high power factor can be achieved without additional input current controller. So the overall system shows a simple structure. The operational modes are analysed in depth, and then it was verified through the experimental results using a 150 [W] prototype equipped with digital signal processor TMS320F241.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 1999.11a
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• pp.290-295
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• 1999

This paper describes Trans-less type utility interactive system that is combined with buck/boost chopper applying partial resonant method, which remove Trans, and high efficient PWM inverter. Therefore, it is possible to make it lightweight, to cut down the cost, and to improve its reliability. What the merits of this system are that we con transmit arbitrary power to load and utility regardless of generating voltage magnitude and we can always obtain high factor controlling by equal phase signal with utility.

• Proceedings of the KIEE Conference
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• 2001.04a
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• pp.467-469
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• 2001

An investigation into power conditioners that interface with photovoltaic array and utilities has been completed. The rating for this investigation is residential system(3-5kW) that interface with a 220V single phase utility connection. As the result of this investigation, a 3kW high frequency PWM IGBT inverter feeding a high frequency isolation transformer with a sinusoidal current wave was selected. The output of the transformer rectified with a diode bridge rectifier, four IGBT, used as 60Hz switched, reverse the polarity of the rectified current on every other half cycle of the utility voltage. Even though the high frequency link system used more power semiconductors, a net size, weight, and parts cost saving result compared to the other systems due to elimination of 60Hz transformer.

• Proceedings of the KIPE Conference
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• 2008.06a
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• pp.314-316
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• 2008

계통연계형 태양광 PCS는 주로 전압원 인버터와 전압의 승압을 위한 DC/DC컨버터, 즉 이단구조로 구성된다. Z-소스 인버터는 DC/DC컨버터 없이 전압을 승/감압할 수 있다. 3k급 계통연계형 태양광 PCS에 Z-소스 인버터를 적용하여 일단구조로 설계하였고 PSIM 시뮬레이션과 실험을 통하여 타당성을 검증하였다.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2008.10a
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• pp.307-310
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• 2008

This paper is proposed the vector control of 3-phase induction motor drive system by photovoltaic generation. For performance of vector control using a current control voltage source inverter(CC-VSI). CC-VSI is controlled by torque and flux producing component of motor current, relating with current and voltage value of photovoltaic arrays at maximum power point that varies follow different level of insolation. The MPPT using a DC-DC converter controlled the duty cycle to track maximum power from PV under different insolation conditions. The simulation results are shown that the characteristics and performance of drive system, which varies as each conditions of light by expresses in voltage($V_{dq}$), current($I_{dq}$), speed of motor and torque.