The Journal of the Korea institute of electronic communication sciences (한국전자통신학회논문지)

Korea Institute of Electronic Communication Science (한국전자통신학회)
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A Study on the Step-up DC-DC Converter for PV System Application Under Variable Input Voltage Condition

가변 입력 전압 조건하에서 태양광 시스템 적용을 위한 승압형 DC-DC 컨버터 연구

  • 이주엽 (남서울대학교 전자공학과) ;
  • 오세천 (남서울대학교 전자공학과) ;
  • 조일형 (남서울대학교 전자공학과) ;
  • 김예진 (남서울대학교 전자공학과) ;
  • 고윤석 (남서울대학교 전자공학과)
  • Received : 2024.06.18
  • Accepted : 2024.08.12
  • Published : 2024.08.31
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Abstract

In this paper, the design method of a step-up DC-DC converter based on PWM control was studied for solar power system application. The operating principle of the switching mode step-up type DC-DC converter was analyzed and the basic design method was studied. For photovoltaic system application, an output voltage feedback control algorithm based on PWM control was developed to enable the converter's output voltage to follow the target voltage under variable input conditions. As a procedure to verify the effectiveness of the proposed algorithm, a prototype of a step-up DC-DC converter with a single feedback output voltage was designed and made by boosting the input voltage DC 10V to DC 30V. In experiments with prototypes, it was confirmed that the output voltage of the oscilloscope and LCD accurately followed the target output voltage. In the performance evaluation test, it was confirmed that the output voltage of the oscilloscope and LCD accurately followed the target output voltage by showing an error rate within 1 [%] of the reference voltage.

본 논문에서는 태양광 시스템 적용을 위한 PWM 제어 기반의 승압형 DC-DC 컨버터 설계 방법을 연구하였다. 스위칭 모드 방식의 승압형 DC-DC 컨버터의 동작원리를 분석하였으며 기본적인 설계 방법을 연구하였다. 태양광 시스템 적용을 위해 가변 입력 조건 하에서 컨버터의 출력 전압이 목표 전압을 추종할 수 있도록 PWM 제어를 기반으로 하는 출력 전압 궤환 제어 알고리즘을 개발하였다. 제안된 알고리즘의 유효성을 검증하기 위한 절차로서 입력 전압 DC 10V를 DC 30V로 승압하여 출력하는 하나의 궤환 출력 전압을 가지는 승압형 DC-DC 컨버터의 시작품을 설계, 제작하였다. 성능 평가 시험에서 오실로스코프와 LCD의 출력전압이 기준 전압에 대한 1[%] 이내의 오차율을 보임으로써 목표 출력전압을 정확하게 추종함을 확인하였다.

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