분산전원의 Anti-islanding용 수정된 zero-crossing 방식 주파수 검출기법

배병열(Byung-Yeol Bae),백승택(Seung-Taek Baek),이진희(Jin-Hee Lee),서인영(In-Young Suh) 전력전자학회 2008 전력전자학술대회 논문집 Vol.- No.-

This paper proposes a frequency detection method based on an advanced zero-crossing technique. Zero-crossing method for detecting frequency is one of the most widely used methods today. Although it is simple to apply, it requires extra hardware in implementation due to its limitations in accuracy. The proposed method models the error generated during zero crossing linearization and compensated for it in real time which makes it simple and accurate. The validity of the method and its applicability in anti-islanding detection of distributed generators was confirmed through simulation.

고성능 단상 선로응동형 DVR(Dynamic Voltage Restorer)

裵炳烈(Byung-Yeol Bae),李東根(Dong-Geun Lee),韓炳文(Han-Byung Moon),廓魯洪(No-Hong Kwak),朴祥濠(Sang-Ho Park) 대한전기학회 2007 전기학회논문지 Vol.56 No.11

This paper describes the development of a high-performance single-phase line-interactive Dynamic voltage Restorer, which is composed of an H-bridge inverter and super-capacitors. The operational feasibility was verified through computer simulations with PSCAD/EMTDC software, and experimental works with 3㎸A prototype. The developed system can compensates the input voltage sag and interruption within 2㎳, in which the maximum allowable duration of voltage interruption is 1.5 seconds. It can be effectively used to compensate the voltage interruption in the sensitive load, such as computer, communication equipment, automation equipment, and medical equipment. The developed system has a simple structure to be easily implemented with commercially available components and to be highly reliable in operation.

능동전력필터의 기준신호발생을 위한개선된 적응예측필터의 성능 분석

배병열,백승택,한병문 전력전자학회 2004 전력전자학회 논문지 Vol.9 No.6

The performance of active power filter depends on the inverter characteristic, the control method, and the accuracy of reference signal generator. The accuracy of reference signal generator is the most critical item to determine the performance of active power filter. This paper introduces a novel reference signal generator composed of improved adaptive predictive filter. The performance of proposed reference signal generator was verified by means of simulation with MATLAB. The application feasibility was evaluated by building and experimenting a single-phase active power filter based on the proposed reference generator, which was implemented in the DSP(digital signal processor) TMS320C31. Both simulation and experimental results confirm that the proposed reference signal generator can be utilized for the active power filter. 능동전력필터의 성능은 인버터의 특성, 제어 방법, 그리고 기준신호발생기의 정확도에 좌우된다. 이중에서 기준신호발생기의 정확도는 능동전력필터의 성능을 결정짓는 가장 중요한 요소이다. 본 논문은 개선된 적응예측필터로 구성한 새로운 기준신호발생기에 대해 소개하고 그 성능을 MATLAB을 이용한 시뮬레이션으로 검증하였다. 그리고 실제 하드웨어의 적용타당성을 평가하기 위해 개선된 기준신호발생기로 구성한 알고리즘을 TMS320C31 DSP(digital signal processor)에 구현하고 이 기준신호발생기를 기반으로 하는 단상능동전력필터의 축소모형을 제작하여 실험을 실시하였다. 시뮬레이션과 실험결과로 제안하는 기준신호발생기가 위상지연이 없는 기준신호를 추출하여 능동전력필터에 활용가능하며 그 성능도 대단히 우수함을 알 수 있었다.

Islanding Detection Method for Inverter-based Distributed Generation Systems using a Signal Cross-correlation Scheme

배병열,정종규,이지헌,한병문 전력전자학회 2010 JOURNAL OF POWER ELECTRONICS Vol.10 No.6

This paper describes the development of a new islanding detection method for inverter-based distributed generation systems,which uses a signal cross-correlation scheme between the injected reactive current and the power frequency deviation. The proposed method injects 1% of the reactive current to the rated current which brings about a negligible degradation of the power quality. It discriminates the islanding state, when the calculated cross-correlation index is larger than 0.5. The operational feasibility was verified through computer simulations with PSCAD/EMTDC software and experimental research with a hardware prototype. The proposed method can detect the islanding state without degrading the power quality at the point of common connection. Further study is required to overcome the cancellation of the injected reactive current from multiple distributed generation units interconnected with the utility grid.

전력품질 보상기와 부하모의장치의 연계시험 분석

배병열,조윤호,박용희,한병문 전력전자학회 2007 전력전자학회 논문지 Vol.12 No.1

This paper describes a load simulator with power recovery capability, which is based on the voltage source converter-inverter set. The load simulator can save the electric energy that should be consumed to test the operation and performance of the power quality compensator and the power equipment. The load simulator consists of a converter-inverter set with a DSP controller for system control and PWM pulse generation. The converter operates as a universal load to model the linear load and the non-linear load, while the inverter feed the energy back to the power source with harmonic compensation. the performance of proposed load simulator was analyzed with scaled-model experiment, interconnected with the active power filter. The experimental results confirms that the proposed load simulator can be utilized to test the performance of active power filter. 본 논문에서는 새로 개발된 전력품질 보상장치의 성능을 실험실에서 효과적으로 분석하기 위해 필요한 새로운 부하모의장치를 제안하였다. 제안하는 부하모의장치는 2대의 PWM 인버터가 직류 단을 공유한 구조로 선형과 비선형부하를 단일기기로 시험 가능하도록 설계되어 있다. 그리고 전력품질보상기의 하나인 능동전력필터와 연계시험을 수행하였다.본 논문에서는 제안하는 부하모의장치와 능동전력필터의 연계 특성을 분석할 목적으로 PSCAD/EMTDC 소프트웨어를 이용하여 시뮬레이션 실시하였고 또한 실적용시 타당성을 검증할 목적으로 20kVA 용량의 부하모의장치와 10kVA용량의 능동전력필터를 제작하여 실험을 실시하였다. 시뮬레이션과 하드웨어 실험결과 제안하는 부하모의장치는 능동전력필터의 다양한 보상 능력 검증에 충분히 활용가능함을 알 수 있었다.

계통연계 분산전원의 새로운 단독운전 판별기법

裵炳烈(Byung-Yeol Bae),李斗榮(Doo-Young Lee),韓炳文(Byung-Moon Han),高宗宣(Jong-Sun Ko),崔南燮(Nam-Sub Choi) 대한전기학회 2008 전기학회논문지 Vol.57 No.1

This paper describes the development of a novel islanding detection method, which uses the signal cross-corelation scheme between the injected reactive current and the power frequency deviation. The existing method, which injects the reactive current of 2.5-5% to the rated current and detects the frequency deviation directly, brings about lowing the power quality due to the harmonic pollution. The proposed method eliminates the weak point of the existing method, because it injects the reactive current less than 1% to the rated current. The operational feasibility was verified through computer simulations with PSCAD/EMTDC software, and experimental works with a 10㎸A hardware prototype. The proposed method can detect the islanding status effectively without lowing the power quality of interconnected distributed generation system.

다계 H-브리지로 구성된 UPQC의 실험적 분석

배병열(Byung-Yeol Bae),이동근(Dong-Geun Lee),이두영(Doo-Young Lee),한병문(Byung-Moon Han) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.4

본 논문은 다계 H-브리지와 다권선 변압기를 이용하여 22.9㎸ 배전계통에 직접결합하여 전력품질을 보상하는 UPQC(Unified Power Quality Conditioner)를 제안하고 그 동작을 분석한 내용을 기술하고 있다. 제안하는 UPQC는 스위칭소자를 직결한 방식대신 H-브리지로 구성된 인버터모듈을 직결하는 방식으로 동작전압을 증가시켜 배전전압 22.9㎸에서 동작할 수 있도록 고안되어 있다. 제안하는 시스템의 기술적 타당성을 입증하기 위해 EMTDC 소프트웨어에 의한 시뮬레이션을 통한 분석을 실시하였으며 또한 하드웨어 축소모형을 제작하여 실험을 통한 분석을 실시하였다. 이러한 검증을 통하여 제안하는 UPQC는 실제규모로 용량을 확대하여 배전계통에 결합할 경우 동작이 가능할 것으로 보인다. 제안하는 UPQC는 배전전압에 따라 H-브리지 모듈의 수를 가감하여 설계의 유연성을 확보할 수 있고 직렬주입변압기가 없이 동작이 가능하여 기존 UPQC의 직렬주입변압기에 의한 제반 취약점을 제거할 수 있다.

전력품질보상기와 부하모의장치의 연계시험 분석

배병열(B.Y. Bae),한병문(B.M. Han),소용철(Y.C SO),김현우(H.W. Kim),백승택(S.T. Baek) 전력전자학회 2006 전력전자학술대회 논문집 Vol.- No.-

본 논문에서는 새로 개발된 전력품질 보상장치의 성능을 실험실에서 효과적으로 분석하기 위해 필요한 새로운 부하모의장치를 제안하였다. 제안하는 부하모의장치는 2대의 PWM 인버터가 직류 단을 공유한 구조로 선형과 비선형부하를 단일기기로 시험 가능하도록 설계되어 있다. 그리고 전력품질보상기의 하나인 능동전력필터와 연계시험을 수행하였다. 본 논문에서는 제안하는 부하모의장치와 능동전력필터의 연계 특성을 분석할 목적으로 PSCAD/ EMTDC 소프트웨어를 이용하여 시뮬레이션 실시하였고 또한 실적용시 타당성을 검증 할 목적으로 20kVA 용량의 부하모의장치와 10kVA용량의 능동전력펼터를 제작하여 실험을 실시하였다. 시뮬레이션과 하드웨어 실험결과 제안하는 부하모의장치는 능동전력필터의 다양한 보상 능력 검증에 충분히 활용가능함을 알 수 있었다.

고객의 접촉 및 개별화 수준이 서비스 품질 평가에 미치는 영향에 관한 연구

裵秉烈 全北大學校 1997 論文集 Vol.43 No.-

Service quality is essential to success in today's business environment. This research involves an experiment which was designed to measure perceived service quality based upon the manipulation of the service contact and customization levels. This research addresses each of the following research objectives. ① To test the effect of the customer's contact level on perceived service quality ② To test the effect of the customer's customization level on perceived service quality ③ To explore the interaction effect of contact and customization level on perceived service quality. The level of relationship tested are effect associated with the contact and customization variables and the service quality dimensions. Rating of the five SERVPERF dimensions are hypothesized to change dependent upon the levels of the contact and customization. The results of the MANOVA analysis are as follows. In general, the results indicate no strong main effect or interactions. However, the contact construct produced a marginally significant main effect on the reliability dimension. The different levels of customization within a service offering do not affect perceptions of the dimensional service quality attributes. The contact and customization variables produced a marginally significant interactive effect on the empathy dimension.

디지털제어기를 기반으로 하는 단상 능동전력필터

裵炳烈(Byung-Yeol Bae),李知憲(Ji-Heon Lee),李慧姸(Hye-Yeon Lee),朱永雅(Young-Ah Ju),韓炳文(Byung-Moon Han),朴炳柱(Byung-Ju Park),尹同哲(Dong-Chul Yoon) 대한전기학회 2008 전기학회논문지 Vol.57 No.5

This paper describes a single-phase active power filter based on a newly developed digital controller. The developed controller utilizes FFT(Fast Fourier Transform) algorithm to extract the reference signal from the load current, considering the phase-angle delay of each order of harmonics. Optimized technique was applied for whole control algorithm to implement the real-time operation of developed controller. The performance of developed controller for a single-phase active power filter was verified through computer simulations with PSCAD/EMTDC. The feasibility of hardware implementation was confirmed by building and testing a prototype. The developed digital controller for a single-phase active power filter can compensate the harmonic current generated by the power supply for digital equipment.