• 전기학회논문지
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• 제59권9호
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• pp.1638-1643
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• 2010

HVDC is better economic method than HVAC in case of long distance transmission and it is possible to interconnect transmission lines regardless of difference of power frequency. The electrical environment problems of HVDC overhead transmission line are electric field, charged voltage, ion current and so on. For biopolar HVDC lines, most of the ions are directed toward the opposite polarity conductor, but a significant fraction is also directed toward the ground. These problems are major factor to design configuration of HVDC overhead transmission line. Therefore, It is necessary to test an environmental characteristics of HVDC overhead transmission line. In this paper, to assess the ion characteristic of HVDC transmission line, continuous measurements have been done on the biopolar single circuit line with ACSR 480mm2-6 bundle conductors of Gochang HVDC Test line. And then the ion characteristics were analyzed.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2015년도 제46회 하계학술대회
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• pp.153-154
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• 2015

Voltage Source Converter HVDC (VSC-HVDC) are a better alternative than conventional thyristor based HVDC systems. Unfortunately, VSC-HVDC's full potential cannot be utilized up till now due to absence of suitable HVDC protection. Recently, hybrid HVDC circuit breakers (HDCCB) have been developed and successfully lab tested. However, their application and feasibility in VSC-HVDC needs to be investigated. In this research paper we have modelled an existing HDCCB and evaluated its impact on fault reduction and interruption in VSC-HVDC systems. The HDCCB was applied in Korean Jeju-Haenam VSC-HVDC system model and its impact was analyzed for HVDC line-to-ground and line-to-line faults. HDCCB successfully interrupted the fault current and prevented the damages to costly IGBTs and converter transformers.

• KEPCO Journal on Electric Power and Energy
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• 제5권4호
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• pp.249-256
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• 2019

국내에 향후 건설 예정인 도체귀로형 HVDC ±500 kV Double Bipole 가공송전선로의 최적선로 형상을 설계하고 송전선로에서 발생되는 전기환경장해를 검증하기 위해 실증시험장을 구축하여 1년간 전기환경장해 평가시험을 수행하였다. 또한, HVDC Double Bipole 실선로에서 인체의 지표면 전계인지도 평가시험을 통해 HVDC 실규모 실증선로 직하에서 인체가 직류 전계를 감지하는 임계값을 조사하여 HVDC ±500 kV Double Bipole 가공송전선로의 직류전계 설계기준안의 타당성을 검증하였다. HVDC ±500 kV Double Bipole 시험선로의 극형상은 전기환경장해와 운영관점에서 동일한 극성을 대각으로 배치하였으며, 국내 가공송전선로의 전기환경장해의 사회적인 수용성을 고려하여 선로에서 코로나방전이 거의 발생되지 않도록 소도체 방식은 6 도체를 선정하였다. 도체귀로형 HVDC ±500 kV Double Bipole 가공송전선로 방식인 Cardinal×6B를 적용한 실증시험결과, 선로 도체에서 코로나 방전이 거의 발생되지 않았으며, 따라서 지표면 전계와 이온전류밀도는 모두 국내 가공송전선로 설계 기준값을 만족하였다. 또한 선로직하에서 피조사자들에 대한 전계 인지도 평가결과, 피조사자들의 70%는 23 kV/m에 노출되어도 직류전계를 인지하지 못하는 결과를 나타냈다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2015년도 제46회 하계학술대회
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• pp.1102-1103
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• 2015

The researchers worldwide have been trying to apply high temperature superconducting wire for power system devices. High voltage direct current (HVDC) transmission system has been used for bulk and long-distance power transmission. The authors designed a laboratory-scale superconducting DC transmission line to investigate its applicability to an HVDC system. The superconducting DC transmission line was simulated in connection to a laboratory-scale HVDC system using PSCAD/EMTDC. The operating characteristics of the superconducting DC transmission line connected to HVDC system and the effects of the superconducting DC transmission line on HVDC system were analyzed and compared with the results of a conventional DC transmission line. The results of operating characteristics for the superconducting DC transmission line were discussed in detail.

• 전기학회논문지
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• 제67권4호
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• pp.554-560
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• 2018

Since Korea has a small land area, it is expected to construct the conductor return type with neutral wire in the case of ${\pm}500kV$ HVDC double bipole transmission line. Therefore, in order to apply ${\pm}500kV$ HVDC double bipole transmission line with neutral wire in Korea, it is necessary to develop technology for insulation and environmental designs. In this study, radio interference, audible noise, electric field and ion current density according to the polarity arrangement were compared and assessed in the ${\pm}500kV$ HVDC double bipole transmission line with the conductor return method. And the optimum configuration of HVDC double bipole transmission line was determined from the viewpoint of electrical environment.

• 대한전기학회논문지:전기물성ㆍ응용부문C
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• 제55권11호
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• pp.520-526
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• 2006

Corona interferences, such as radio noise, audible noise and television noise, need to be taken into account in the design of HVDC transmission line conductor configuration. Therefore the line designer requires data from which to estimate the corona performance of any set of conductors. To get a sufficiently complete set of design data, it is necessary to examine the corona test of a large number of conductor geometries. This paper presents the results of corona cage test among three types of candidate conductors. It is quite clear from test results that the conductor geometries play an important role in establishing the magnitude of corona noise. Corona noise data from corona cage test are expressed as a statistical distribution of results obtained over long periods of time and various weather conditions. Therefore we can determine an environmentally-friendly conductor bundle for HVDC overhead transmission line. Based on this finding results, various simulations about HVDC line configurations, such as pole space and pole height, will be conducted. And then finally an optimal configuration for HVDC transmission line will be decided.

• 전기학회논문지
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• 제66권10호
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• pp.1454-1459
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• 2017

In spite of continuous increase of electric power demand and new generation plants, it is very difficult to install new transmission line. Therefore, it comes to be difficult to operate the power system stable, so it is required to find another way to get new transmission capacity. Because HVDC transmission system installation is the one of the best option for us, we have undertake the HVDC project in mainland. Buckdangjin-Goduck HVDC project(500kV, 3GW) is currently under construction and Eastern Power HVDC project(500kV, 8GW) is under the study for technical specification. Both of them have the Run-up SPS function for taking action of 765kV Transmission line fault. The Run-up SPS function increases the active power output of the HVDC rapidly when the transmission line between the power plant and network is tripped, thereby preventing the generator from overspeed and improving the power system stability. In this paper, we propose MEAC(Modified Equal Area Criteria) method based on traditional EAC method to quantitatively evaluate the effect of the HVDC run-up SPS function on the power system stability improvement.

• 전기학회논문지
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• 제67권8호
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• pp.1113-1118
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• 2018

Protection in HVDC(High Voltage Direct Current) have the very fast velocity of fault detection. Because Fault in HVDC has the fast propagation, large currents, high interruption cost. The focus to velocity caused possibility of errors like a detection error like a high impedance fault. In this paper, Proposed complex composition for get the reliability and velocity. That used SFCL(Super Conducting Fault Current Limiter), Protection Zone and DTS(Distributed Temperature Sensing). The SFCL was detect the fault by quench and DTS&Protection Zone were perceive the detect by variation too. To examine the proposed method, PSCAD/EMTDC simulated. The results of simulation, proposed methods could the detect of fault to whole HVDC line. And that improved the reliability of fault clearing.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2015년도 제46회 하계학술대회
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• pp.429-430
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• 2015

HVDC 송전망의 형태는 가공선로(Overhead Transmission Line)와 지중선로(Underground Transmission line)가 있다. 가공선로는 비교적 건설비가 저렴하고 쉽게 설치 할 수 있다는 장점이 있지만 설치할 부지를 확보하기 어렵다는 단점이 있다. 또한 지중선로는 설치되는 지역의 외관을 해치지 않고 주변 환경에 크게 영향을 주지 않는다는 장점이 있지만 케이블을 매설하기 위해서 깊은 관로를 파야하며 이때 많은 비용이 발생하게 된다는 단점이 있다. 새롭게 제시하는 HVDC Pipeline은 두 가지 송전망과 다른 새로운 방식으로서 도로에 Pipeline형태로 HVDC케이블을 얕게 매설하거나 지표면에 도출시키는 방식이다. 도로를 이용함으로서 가공선로의 새로운 부지를 확보해야한다는 단점을 개선하고 깊은 관로로 인해 발생하는 지중선로의 높은 공사비용을 감소시킬 수 있는 방안이라고 생각한다.

• 전기학회논문지
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• 제57권11호
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• pp.2035-2040
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• 2008

The electrical discharge of high voltage direct current(HVDC) overhead transmission line generate audible noise, radio noise, electric field, ion current and induced voltage on the ground. These items are major factors to design environmentally friendly configuration of DC transmission line. Therefore, HVDC transmission lines must be designed to keep all these corona effects within acceptable levels. Several techniques have been used to assess interference caused by ions on HVDC overhead transmission line. In this study, to assess the ion characteristic of DC line, the ion current density and induced voltage caused by ion flow were measured by plate electrodes manufactured from a metal flat board and charged bodies, respectively. The charged body has two types of cylinder and cylindrical plate. From the results of calibration experiments, the sensitivity of flat electrode and charged body can be obtained. At present, the developed system is used to investigate the ion generation characteristics of Kochang DC ${\pm}500kV$ test line.