Journal of the Institute of Electronics and Information Engineers (전자공학회논문지)

The Institute of Electronics and Information Engineers (대한전자공학회)
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Development of advanced Power Factor Computation Algorithm in Harmonics distorted Distribution System

고조파 왜곡 환경에서 향상된 역률 계측 알고리즘 개발

  • Lee, Hyun-woo (Kyungpook National University Medical Device and Robot Institute of Park) ;
  • Park, Young-kyun (Kyungpook National University Medical Device and Robot Institute of Park) ;
  • Lee, Jinhan (Kyungpook National University Medical Device and Robot Institute of Park) ;
  • Joung, Sanghyun (Kyungpook National University Medical Device and Robot Institute of Park) ;
  • Park, Chul-woo (Kyungpook National University Medical Device and Robot Institute of Park)
  • 이현우 (경북대학교 의료로봇연구소) ;
  • 박영균 (경북대학교 의료로봇연구소) ;
  • 이진한 (경북대학교 의료로봇연구소) ;
  • 정상현 (경북대학교 의료로봇연구소) ;
  • 박철우 (경북대학교 의료로봇연구소)
  • Received : 2016.05.25
  • Accepted : 2016.06.30
  • Published : 2016.07.25
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Abstract

We propose a algorithm to calculate power factor of fundamental waveform in an environment where the voltage and current have been distorted by harmonics. In the proposed power factor computation algorithm, voltage and current are converted to rotating DQ reference frame, and power factor is calculated from active power and reactive power. We compare the proposed method with the conventional power factor measurement method as mathematically. In a condition that voltage and current are distorted by harmonics, the proposed method accurately measure the power factor of fundamental wave, and it is confirmed by simulation using MATLAB. If the proposed power factor measurement method is applied to an automatic power factor control system, a power factor compensation performance can be maximized in harmonic distortion environment. As a result, it is possible to reduce electricity prices, reduce line loss, increase load capacity, ensure the transmission margin capacity, and reduce the amount of power generation.

본 논문에서는 고조파로 전압과 전류가 왜곡된 상황에서 정확하게 기본파의 역률을 측정할 수 있는 방법을 제안한다. 제안한 역률 계측 방법에서는 전압과 전류를 DQ회전좌표계로 변환한 후 유효전력과 무효전력을 계산하여 역률값을 구하게 된다. 기존의 역률 계측방법과 제안한 방법을 수식적으로 비교하여 제시하고, 제안한 방법은 전압과 전류 모두 고조파 왜곡된 상황에서도 기본파의 역률을 정확하게 계측할 수 있는 것을 MATLAB을 이용한 모의실험에서 확인한다. 제안한 역률 계측방법을 자동역률제어장치에 적용할 경우 고조파 왜곡 환경에서 역률 보상 성능을 최대화 할 수 있다. 그 결과 수용가에서는 역률 개선을 통한 전기료 감소, 선로손실 감소, 부하 용량 증대 효과가 기대된다. 특히 발전 사업가 측에서는 역률 보상 성능의 향상으로 송전 여유 용량 확보와 발전량 절감이 가능하다.

Keywords

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