• Proceedings of the KIPE Conference
• /
• 2011.07a
• /
• pp.76-77
• /
• 2011

태양광 발전 시스템에서 태양광 모듈은 일사량과 온도에 따라 출력특성이 변하고 비선형적인 특성을 지니고 있다. 따라서 최대전력 출력을 얻기 위해서는 컨버터에 의한 최대 전력점 추종제어가 필요하다. 특히 발전시스템에서 요구하는 전기적 특성을 맞추기 위해 다수의 태양모듈을 직병렬로 연결하여 구성하는데 있어서 그림자 혹은 일부 모듈이 정상작동하지 않아 미스매치 손실이 발생하게 된다. 본 연구에서는 미스매치 손실을 극복하는 최대전력점을 추종하는 제어알고리즘을 설계하였고 이를 시뮬레이션을 통해 검증하였다.

• Proceedings of the KIPE Conference
• /
• 2013.07a
• /
• pp.256-257
• /
• 2013

이 논문에서는 셔플링 컨버터를 이용해 다중 태양광 모듈의 최대 전력점 추종시 각 태양광 모듈간의 전류 편차에 의해 셔플링 컨버터에 과전류가 흐르는 것을 방지하기 위해 태양광 모듈에서의 전류 편차를 이용해 셔플링 컨버터에서의 전류를 계산하는 법을 고안하고, 이를 이용해 전류를 제한하는 기법을 제안하였다. 제안하는 방식을 증명하기 위해 PSIM 소프트웨어를 이용하여 그 타당성을 입증하였다.

• Journal of the Korean Solar Energy Society
• /
• v.39 no.2
• /
• pp.1-9
• /
• 2019

In order to increase the power generation efficiency of the photovoltaic system, a new algorithm that can follow the maximum power point of the photovoltaic power generation system having nonlinear output characteristics is proposed. Conventional maximum power point tracking (MPPT) algorithms such as Perturbation and Observation (P&O) and InCond (Increment and Conductance) schemes can not find the global maximum power point at a plurality of pole points in the unmatched state of unbalanced PV modules. However, even if the global maximum power point is found at a plurality of pole points, the global maximum power that can not be the real maximum power by the photovoltaic generation system. In order to solve this problem, a few PV companies propose installing several small PV inverters instead of if big one. However, since this will require additional costs, we herein propose a Multi-MPPT system using individual 3-point MPPT to track true MPPT at a plurality of pole points in the unmatched state of unbalanced PV modules.

• Journal of the Korean Institute of Intelligent Systems
• /
• v.23 no.1
• /
• pp.72-79
• /
• 2013

In the paper, a pattern analysis to decide whether the 1st local peak power point near open circuit voltage is the global peak power point or not, in case that the voltage and current at the 1st local peak power point are in a specific range, for Maximum Power Point Tracking on the photo voltaic power conversion system. When a solar cell panel array is shaded partially, multi-local peak power points can occur. That makes it hard to search the global peak power point. Through Tableau analysis using by piecewise linear solar cell model, V-I characteristic of a solar cell panel array circuit when partial shading problem happens, is simulated. The global peak power and the local peak power points is confirmed by simulations. Voltage and current values and patterns of V-I characteristic are analyzed. The generating efficiency of the solar cell panel array is improved, when the solar cell panel array circuit is operated at the power point estimated by setting up specific range.