고조파발생에 따른 영향과 대책 연구 = Effect of Harmonic Generation and Countermeasures

다국어 초록 (Multilingual Abstract)

Skyscrapers, large business buildings, and IT consumers use many appliances, and the electrical power stems can causefires by overheating. This can result in damaged capacitors, lost data, rising ground potential, and communication obstaclesfrom linear or nonlinear high frequency. To make sure of that we investigated 7 spots of a building, among which 6-spots were fair but the other one needed high frequency control. Spots 3, 6, and 7 needed diagnostic workup, and spots 2,3, and 5 considered 5 high frequency currents. A phase is all of good but the high frequency current is greater than thestandard level except for spot 1. As a result, a zigzag transformer or active filter needs to be installed, and the efficiencyneeds to be upgraded by investigating load unbalance factors and power factors.

국문 초록 (Abstract)

초고층건축물이나 대형 사업장과 IT를 추구하는 수용가는 많은 가전기기 사용하여 선형, 비선형부하시의 고조파로인한 Capacitor의 과열 및 소손, 자료 손상, 대지전위 상승, 통신유도장해등을 일으켜 전력설비의 오동작과 과열로 화재의원인이 될 수 있다. 이를 확인하기 위해 건축물의 7곳을 조사하여 비교한 결과 6곳에서는 적정하였으나 1곳은 고조파관리가 필요하였다. 전류 고조파는 No. 3, 6, 7은 매우 초과하여 정밀 진단이 필요하였으며 No. 2, 3, 5는 5고조파 전류를 고려하여야 한다. R상 전압고조파는 양호하였으나 전류고조파는 No. 1을 제외하고 No. 2, 3, 4, 5, 6, 7은 모두 기준을 초과하였다. 따라서 지그재그변압기나 엑티브필터를 설치하여 고조파 상승을 억제시킬 필요가 있고 설비불평형률,역률등을 종합 조사하여 효율도 향상시킬 필요가 있다.

참고문헌 (Reference)

• 1 IEEE Task Force on Harmonics Modeling and Simulation, "Test system for Harmonics Modeling and Simulation" 1999
• 2 IEEE std, "IEEE Standard for Interconnecting Distriduted Resources with Electric Power Systems"
• 3 "IEEE 519A, Guide for Appling Harmonic Limits on Power System"
• 4 Korea Electric Power Corporation, "Electricity supply General Terms and Conditions" 2014
• 5 Korea Electric Power Corporation, department of distribution, "Distributed Power Distribution Grid Connection Technology Standards" 2007
• 6 I. M. Lee, "Astudy on the Interpertion Model of Power Quality Using Waveform Synchronization and Automatic Analysis" Hongik University 2006
• 7 K. C. Kim, "A Study on the Power Factor Correction and Harmonics Reduction of Capacitor Banks installed at Customers" Korea Electrical Installation Institute 59-62, 2008