• Journal of Satellite, Information and Communications
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• v.7 no.3
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• pp.135-139
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• 2012

A digital controller can simply realize a complex operation algorithm and power control process which can not be applied by an analog circuit for a solar array regulator(SAR). The digital resistive control(DRC) makes an equivalent input impedance of the SAR be resistive characteristic. The resistance of the solar array varies largely in a voltage source region and slightly in a current source region. Therefore when the solar array regulator is controlled by the DRC, the Advanced Incremental Conductance MPPT Algorithm with a Variable Step Size(AIC-MPPT-VSS) is suitable. The AIC-MPPT-VSS, however, using small signal resistance and large signal resistance of the solar array can not limit the absolute value of the solar array power. In this paper, the solar array power limiter is suggested and the BUCK-BOOST type SAR which is fully controlled by the digital controller is verified by simulation.

• Electric Engineers Magazine
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• v.261 no.5
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• pp.42-44
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• 2004

최근 북한의 에너지난으로 인한 대북전력지원 문제가 남북회담의 최대 안건 중 하나가 되었을 정도로 남북관계에 있어서 전력문제에 대한 중요성이 높아지고 있는 만큼, 북한의 전력수급 현황을 살펴볼 필요가 있다.<중략>

• The Transactions of the Korean Institute of Power Electronics
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• v.8 no.3
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• pp.221-229
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• 2003

Interior permanent magnet synchronous motor (IPMSM) has become a popular choice in electric vehicle applications, due to their excellent power to weight ratio. The paper is proposed maximum torque control of IPMSM for electric vehicle drive. The control method is applicable over the entire speed range and considered the limits of the inverter's current and voltage rated value. For each control mode, a condition that determines the optimal d-axis current ${^i}_d$ for maximum torque operation is derived. The proposed control algorithm is applied to IPMSM drive system for electric vehicle drive, the operating characteristics controlled by maximum torque control are examined in detail by simulation.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.29 no.8A
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• pp.868-878
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• 2004

In this paper, we analyse feasibility of Zone-based Power Control (ZPC) scheme introduced for CDMA forward link(1) in the reverse link. To operate ZPC scheme in the CDMA systems the maximum power level that can be allocated to each traffic channel should be determined. Because all the service channels share the whole power resource in the forward lint a specific mechanism that determines Maximum power resource to each traffic channel is required to operate ZPC scheme in the forward link. However, ZPC scheme can be easily adopted to the reverse link, because of the fact that the whole power resource of service terminal is only confined to its traffic channel. In other words, we need not to determine the maximum power resource to be allocated in the reverse traffic channel. Simulation results show that ZPC scheme adopted to the reverse link yields a significant performance improvement compared with the conventional TPC(IS-95 TPC) scheme in terms of the power consumption and the traffic capacity of Portables, especially with the increasing number of high-rate data traffics. With the proposed scheme, not only be extended the service coverage of high-rate data traffic to the entire cell service coverage, but also the QoS of low-rate traffic can keep going through the service time, especially, in the situation that the incoming interference is much larger.

• Journal of Satellite, Information and Communications
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• v.12 no.4
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• pp.67-71
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• 2017

A solar array is main electrical energy source for Low-Earth-Orbit(LEO) satellite. The solar array cannot generate electrical energy during eclipse period, a battery supply electrical energy to the satellite. The electrical power of the solar array is changed in accordance with operating voltage and the solar array has the maximum power point. The solar array regulator makes the solar array supply electrical energy to the satellite and charge the battery. The solar array is connected to the solar array regulator input and the battery is connected to the solar array regulator output. The solar array regulator consists 2 of 3 hot redundant. One solar array regulator contains 3 DC-DC converters, and the solar array regulator operates stably even if the failure occur in one DC-DC converter. In this paper, the solar array regulator, the battery and the solar array operation is analyzed when the failure occur in one DC-DC converter.

• Proceedings of the KIEE Conference
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• 1999.07a
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• pp.412-414
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• 1999

통신용전원으로서의 전력저장시스팀(BESS)은 전기요금이 싼 심야시간(또는 필요시간)에 2차전지(축전지)를 이용하여 전력을 저장하고 최대 부하시나 필요한 시기에 전력을 방출하는 시스팀을 말한다. 이 시스팀은 축전지의 충분한 사용과 최대전력제어에 의한 전기요금 절감측면 등에서 상당히 효율적이라 할 수 있다. 본 논문에서는 이러한 전력저장시스팀을 통신용전원으로 활용하기 위한 방법과 실지 적용시 고려사항, 기대효과 및 개략적인 경제성 비교 둥을 통하여 전력저장시스팀의 통신용전원 적용방안을 검토하고자 한다.

• Proceedings of the KIPE Conference
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• 2014.07a
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• pp.365-366
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• 2014

본 논문에서는 플라이백 마이크로 인버터를 통해 전류센서 없이 최대전력 추종(Maximum Power Point)방법을 제안한다. 이 인버터는 태양광 전력을 역률1인 정현파, 낮은 왜곡율(THDs)로 계통연계 할 수 있는 태양광 인버터 이다. MPPT방식은 전류 센서리스로서 PV모듈의 전압과 MPPT제어 출력 값을 곱하여 PV전력의 정보를 비례적인 값으로 간접적으로 얻는 방식으로 태양광 최대 전력점을 찾을 수 있다. 또한, 계통의 전압으로 위상정보를 얻어 이를 정류시켜 MPPT제어와 곱하여 PWM파형을 발생한다. 제안한 태양광 인버터 전력단 회로는 플라이백으로 불연속 모드(DCM)로 동작하였으며, MPPT제어는 디지털(DSP)로 구현하였다. 100W급 하드웨어로 설계하여 실험을 진행 분석하였다.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.19 no.8
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• pp.832-836
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• 2008

In this study, the electromagnetic coupling problem through narrow slit in an infinite conducting screen is considered for the case that the TM polarized plane wave is incident upon the slit. This study aims at explaining the mechanism of the maximum power transmission via the resonated slit using the equivalent circuit. It is shown that the transmitted power through the slit for the case of resonance corresponds to the power normally incident upon the conducting plane of the effective width 1/pi wavelengths, irrespective of the slit width. Some similarities between the maximum power transmissions observed in both the proposed structure and narrow slit in thick conducting screen are described from the viewpoint of equivalent circuit. In addition, it is found that, when the slit is resonated, the transmitted power equal to the scattered power.

• Journal of Navigation and Port Research
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• v.31 no.3 s.119
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• pp.229-233
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• 2007

This paper presents the performance of PV(Photovoltaic) system, the design of MPPT(Maximum Power Point Tracker). Output of PV power system is DC, and PV power system is linked to the DC bus. The current(I)-voltage(V) output characteristic of PV cells changes with solar irradiance and cell temperature as parameters. As various PV modules respond differently to each of the parameters cited above. Maximum output of PV modules am be achieved by MPPT(Maximum Power Point Tracker) algorithm This paper includes a discussion on the performance of PV module, MPPT algorithm and the influence of PV module angle.

• The Transactions of the Korean Institute of Power Electronics
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• v.8 no.2
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• pp.143-150
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• 2003

An improved MPPT converter with current compensation method for small-scaled PV-applications is presented in this paper. The proposed method implements maximum power point tracking (MPPT) by variable reference current which is continuously changed during one sampling period. Therefore, the Power transferred to the load is increased above 9% by the proposed MPPT converter with current compensation method. As a result, the utilization efficiency of Photovoltaic (PV)-panel can be increased. In addition, as it doesn't use digital signal processor (DSP), this MPPT method has the merits of both a cost efficiency and a simple control circuit design. Therefore, it is considered that the proposed MPPT method is proper to low power, low cost PV-applications. The concept and control principles of the proposed Un moth()d are explained in detail and its validity of the proposed method is verified through several simulated results.