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朴哲圓(Chul-Won Park),申光哲(Kwang-Chul Shin),申明澈(Myong-Chul Shin) 대한전기학회 2008 전기학회논문지 P Vol.57 No.2
AC generator plays an important role of power system. The large AC generator fault may lead to large impacts or perturbations in power system. And then the protection of a generator has very important role in maintaining stability in a power system. In present, the DFT(discrete Fourier transform) based RDR(ratio differential relay) had been widely applied to a internal fault of a generator stator winding. But DFT has a serious drawback. In the course of transforming a target signal to frequency domain, time information is lost, DWT uses a time-scale region. This paper proposes an advanced fault detection algorithm using DWT(discrete Wavelet transform) to enhance the drawback of conventional DFT based relaying. To evaluate the performance of the proposed relaying, we used the test data which were sampled with 720 [㎐] per cycle and obtained from ATP(alternative transient program) simulation. And we made a comparative study of conventional DFT based RDR and the proposed relaying.
박철원(Chul-Won Park),박성완(Sung-Wan Park) 대한전기학회 2013 전기학회논문지 P Vol.62 No.3
A large generator is an important role in transferring an electric power to power system. The IEDs of large generator often use microprocessor technology to obtain a digital relay system with a wide range of measuring, protection, control, monitoring, and communication functions. However, all generator protection and control systems in Korea imported from abroad and are being operated. In order to reduce the large expense and improve the reliable operation, development of generator protection and control system by domestic technology is required. This paper deals with the design of the IED of generator protection panel for development of generator protection and control system. The major emphasis of the paper will be on the description of hardware and signal processing test results and measurement accuracy of the prototype IED. By developing of generator IED based on DSP and microprocessor, replacement of the generator protection panel imports are expected to be effective.
박철원(Chul-Won Park) 한국조명·전기설비학회 2015 조명·전기설비학회논문지 Vol.29 No.4
In this paper, the generator control system by using PSCAD/EMTDC was modeled and several faults simulation were performed. The generator control system is composed of generator, turbine, exciter and governor. The parameters of generator control system model were obtained from field power plant. And then, the various transient phenomena through obtained several signal of developed modeling were analyzed.
박철원(Chul-Won Park),안준영(Joon-Young Ahn),이상성(Sang-Seung Lee),신명철(Myong-Chul Shin) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
The generator system modeling for large generator protection is a significant portion for the analysis of installed apparatus and development of domestic production. In this paper, MATLAB EMTP/ATP, and PSCAD/EMTDC are used to simulate the transient phenomenon for the faults of generator.
고장전류의 웨이브릿 변환을 이용한 동기 발전기 보호 알고리즘
朴哲圓(Chul-Won Park),申明澈(Myong-Chul Shin) 대한전기학회 2007 전기학회논문지 Vol.56 No.5
A generator plays an important role in transferring an electric power to power system networks. The generator protection systems in Korea have been imported and operated through a tum-key from overseas entirely. Therefore, a study of the generator protection field has in urgent need for a stable operation of the imported goods, and for preparation of next generation protection system. The paper describes the fault detection algorithm using WT(Wavelet Transform) of currents for a generator protection. The fault current signals after executing a terminal fault modeling collect using a MATLAB package, and calculate the wavelet coefficients through the process of a multi-level decomposition (MLD). The proposed algorithm for a fault detection using the Daubechies WT (wavelet transform) was executed with a C language for the command line function and for the real time realization after analyzing MATLAB's graphical interface. The advanced technique had complemented the defects of a DFT by applying a Daubechies WT, and had improved faster a speed and more accurate of fault discriminant than a conventional DFR.
태양광 발전이 연계된 DC 마이크로 그리드의 시뮬레이션
박철원(Chul-Won Park) 대한전기학회 2017 전기학회논문지 P Vol.66 No.4
In recent years, there is an increasing demand for DC microgrid because the digital load due to DC increases and the efficiency of the distribution system increases due to loss of conversion losses and conversion stages due to reactive power compared to AC distribution. Currently, with the support of the KEPRI, the development of an electronic large-capacity circuit breaker for DC distribution protection, which has been underway since 2016, is proceeding. In this paper, as a part of this project, we modeled the DC microgrid connected with PV using PSCAD. The converter station, AC/DC converter control, PV and MPPT controller are designed. In order to evaluate the performance of the modeled DC microgrid, it is examined whether the voltage is adjusted according to the load variation.
박철원(Chul-Won Park) 대한전기학회 2013 전기학회논문지 P Vol.62 No.1
Fault currents are expressed as a combination of harmonic components and exponentially decaying DC offset components, during the occurrence of fault in power system. The DC offset components are included, when the voltage phase angle of fault inception is closer to 0° or 180°. The digital protection relay should be detected quickly and accurately during the faults, despite of the distortions of relaying signal by these components. It is very important to implement the robust protection algorithm, that is not affected by DC offset and harmonic components, because most relaying algorithms extract the fundamental frequency component from distorted relaying signal. So, In order to high performance in relaying, advanced DC offset removal filter is required. In this paper, a new DC offset removal filter, which is no need to preset a time constant of power system and accurately estimate the DC offset components with one cycle of data, is proposed, and compared with the other filter. In order to verify performance of the filter, we used collecting the current signals after synchronous machine modeling by ATPDraw5.7p4 software. The results of simulation, the proposed DC offset removal filter do not need any prior information, the phase delay and gain error were not occurred.