• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.1098-1099
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• 2015

${\bullet}$ 시험대상: 영월태양광 4,990kW(998kW ${\times}$ 5호) ${\bullet}$ 13.07.31 연계기술검토의뢰 ${\bullet}$ 13.08.28 한전검토결과: 인근변전소 영월S/S(40MW) 초과로 10.8km 지점의 평창 D/L 평창간 347호 주진S/S에 다음의 보완대책과 연계 권고 ${\cdot}$ 문제점: 적정전압이탈 및 순시전압변동률 유지불가 ${\cdot}$ 연계기준만족을 위해 한전에서 제시한 보완대책 : 계통용량증설(설비보강), 연계용량 감소 및 전용선로 연계 ${\bullet}$ 14.01.09 분산형설치자의 용역사(에이스기술단)에서 송배전용전기설비 이용규정과 연계기준 만족을 위한 보완대책 제안 ${\cdot}$ 태양광발전시스템 인버터 자동전압(역률/무효전력) 조정기능 및 감시설비 구비 ${\cdot}$ 최적 공통연결점 선정: 분산형전원으로 부터 전기적으로 가장 가까운 영월D/L 영월S/S측에 개폐장치설치 하고 주진S/S 측으로 연계 ${\bullet}$ 14.01.29~06.19 한전(전력연구원)의 유효성 검토 ${\cdot}$ 보완대책 기술적 유효(실증시험 시행 후 시행공문 발송 예정) ${\bullet}$ 14.08.08 송배전용전기설비 이용규정 개정에 따른 협의 ${\cdot}$ 변압기 대당 20MW에서 25MW ${\cdot}$ 변전소 전체 60MW에서 75MW까지 허용 ${\cdot}$ 영월 S/S 측 문곡/영월 D/L 연계 공사 협의 ${\bullet}$ 14.10.04 사용전검사, 한전계통연계운전 시작 ${\bullet}$ 인버터 고정역률(99.9~100%) 운전 시험 ${\cdot}$ 14.11.21 22.9kV 계전기(SEL-751) 5대, 15분 간격 자료저장 ${\cdot}$ SEL-751/USB to RS232C/노트북 15분간격 측정(첨부) ${\bullet}$ 14.03.07 인버터 역률 95.0% 조정 15분간격 측정(첨부) ${\bullet}$ 변압기탭 선정과 인버터전압조정협조시험 계획 ${\cdot}$ 변압기탭을 현장에서 상하 1탭씩 변경 ${\cdot}$ 인버터역률을 인버터공급사에서 원격조정 ${\cdot}$ 22.9kV 보호계전기 SEL-751, 15분 간격 측정 ${\cdot}$ 인버터 370V 계전기 K-PAM DG3000/현장감시설비 연계 ${\cdot}$ 15분 간격 측정 저장 ${\cdot}$ 현장감시설비/인터넷 연결 원격측정(첨부예정)

• KIPE Magazine
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• v.25 no.5
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• pp.38-44
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• 2020

• Proceedings of the KIEE Conference
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• 2003.07a
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• pp.491-493
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• 2003

전력계통의 유연하고 안정적인 운용을 위한 인버터형 FACTS 기기의 국내 적용에 대한 연구 결과를 토대로 국내 154kV 계통에 적용되는 80MVA급 UPFC pilot plant project가 수행되었다. Project의 결과물로써 80MVA급 UPFC가 강진-장흥 154kV 계통에 제작, 설치되었다. 강진 변전소 UPFC는 각종 성능 시험 및 시운전 절차를 성공적으로 완료하였으며 현재는 병렬 인버터에 의한 강진 모선의 전압 제어 및 직렬인버터에 의한 강진-장흥간의 조류 제어 기능을 수행하며 상용 운전되고 있다.

• Proceedings of the KIPE Conference
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• 2013.07a
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• pp.232-233
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• 2013

본 논문에서는 태양광 인버터에서 전력 품질 개선을 위해서 사용되는 LCL 필터의 설계 방법을 제시한다. 제안된 방법은 생산 품질의 질을 향상시키기 위해 산업체에서 사용되고 있는 다구치 방법론을 이용한다. 기존 설계에서 고려되던 출력 전력 품질(THD), 인덕터의 크기뿐만 아니라 태양광 인버터의 손실, 광량 변화로 인한 입력 조건의 변화, 출력 전압의 변화를 고려하여 설계한다. 설계 결과는 설계 목표 기능 변수를 향상시키고 동시에 그 변동량을 최소화할 수 있다.

• The Transactions of the Korean Institute of Power Electronics
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• v.9 no.6
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• pp.544-552
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• 2004

This paper deals with the hybrid active filter which can reduce the 11th/13th harmonics in AC network by using the single tuned filter. Since the proposed algorithm uses the detuning compensation capability of the filter, the output voltage of the proposed active power filter is changed according to the capacitance of capacitors, magnitude of harmonic current, resonance frequency and control mode. In this paper, the control characteristics and the design of hybrid active filter is investigated. A new hybrid active filter with new algorithm, which is an active filter with single tuned filter instead of double tuned filter, is proposed.

• The Transactions of the Korean Institute of Power Electronics
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• v.5 no.2
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• pp.200-207
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• 2000

Recently, it is increased to apply the inverter system to household electrical appliances, especially in the air c conditioners, refrigerators and washing machines, to reduce the power consumption and the acoustic noise by t the low speed operation, and to make their functions more comfortable for human beings. For the inverter s systems, however, it is highly required to reduce the undesirable electromagnetic noise and psychoacoustic n noise generated by PWM for variable speed operation. In this paper, the electromagnetic noise for the d detenninistic PWM and random PWM for the reciprocating compressors driven by the brusWess dc motor was a analyzed. It was also verified through the experiment that the elt'Ct$\tau$omagnetic noise was reduced and the s sound quality was improved by applying the random PWM.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.14 no.1
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• pp.109-117
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• 2000

A full bridge type double resonant high frequency resonant inverter to give VVVF function in the inverter used as power source of induction heating at high frequency is presented in this paper. This proposed inverter can reduce distribution of the switching current because of using the current of serial resonant circuit to the input current of the parallel one and this paper also realize the output control of independence irrespective of the switching frequency using Phase-shift. The analysis of the proposed circuit is generally described by using the normalized parameters. Also, the principle of basic operating and the its characteristics are estimated by the parameters, such as switching frequency, the variation of phase angle ($\phi$) of Phase-shift.

• The Transactions of the Korean Institute of Power Electronics
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• v.16 no.6
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• pp.587-593
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• 2011

A new high power density and low cost Photovoltaic Power Conditioning System (PV PCS) with energy storage system is proposed. Its high power density and cost effectiveness can be achieved through the unification of the maximum power point tracker and battery charger/discharger. Despite of the reduced power stage, the proposed system can achieve the same performances of maximum power point tracking and battery charging/discharging as the conventional system. Moreover, the high voltage stress across the link-capacitor can be relieved through the series-connected link-capacitor with the battery. Therefore, a large number of series/parallel-connected link-capacitors can be reduced by 4-times. Especially, when the utility power failure happens, both photovoltaic and battery energies can be supplied to the load with only one power stage. Therefore, it features a simpler structure, less mass, lower cost, and fewer devices. Finally, to confirm the operation, validity, and features of the proposed system, theoretical analysis and experimental results from a single phase AC 220Vrms/1.5kW prototype are presented.

• The Transactions of the Korean Institute of Power Electronics
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• v.6 no.5
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• pp.432-437
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• 2001

This paper describes a new developed 3.3KV/4MW class three-level Voltage Source Inverter(VSI), which is equipped with IIMS(Inverter Information Management System) based on the world wide web and with the Virtual operation simulator. The algorithm for motor control is the stator oriented Direct Torque Control(DTC), which works without speed sensor and gives the physically fastest dynamic response. The IIMS have the functions of operation monitoring and data managements. Virtual operation simulator can analyze and tune the system characteristics without main power. Now, this system is under the field test to verify the confidence.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.37 no.1
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• pp.19-28
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• 2000

The parallel inverter is widely utilized because of its fault-tolerance capability, high-current output at constant voltages and system modularity. The conventional paralled inverter usually employes an active and reactive power control or a frequency and voltage droop control. However, these approaches have the disadvantages that the response time of parallel inverter control is slow against load and system parameter variation to calculate active, reactive power, frequency and voltage. This paper describes novel control scheme for equalization of output power between the parallel connected inverters. The proposed scheme has a fast power balance control response, a simplicity of implementation, and inherent peak current limiting capability since it employes a instantaneous current/voltage control with output voltage and current balance and output voltage regulation. A design procedure for the proposed parallel inverter controller is presented. Futhermore, the proposed constrol scheme is verified through the simulation in various cases such as the system parameter variation, the control parameter variation and the nonlinear load condition.