Improving the Efficiency of a Photovoltaic System Using a Hybrid Control Method Based on a DPP Structure
- PDF / 2,615,366 Bytes
- 8 Pages / 595.276 x 790.866 pts Page_size
- 44 Downloads / 177 Views
ORIGINAL ARTICLE
Improving the Efficiency of a Photovoltaic System Using a Hybrid Control Method Based on a DPP Structure Dong‑Eun Kim1 · Hyun‑Jae Lee1 · Hak‑Ryong Moon2 · Jin‑Geun Shon1 Received: 24 April 2020 / Revised: 29 July 2020 / Accepted: 4 October 2020 © The Korean Institute of Electrical Engineers 2020
Abstract In this paper, a hybrid control method is proposed, based on a differential powerprocessing (DPP) structure for a maximumefficiency photovoltaic (PV) system. The DPP structure has the least power-conversion loss among PV system structures. When applying some maximum power-point tracking (MPPT) control methods to the DPP structure, the structure needs to change. However, the hybrid control method proposed in this paper can be applied without changing the DPP structure. Moreover, it is possible to quickly reach the initial maximum power point (MPP) zone and to generate power at the correct MPP. Through simulations, the method’s operation and superiority were confirmed. In addition, this method was tested experimentally with hardware, based on a digital signal processor (DSP) (TMS320F28335). Hence, we can improve the reliability of this method. Keywords Differential power processing (DPP) structure · Digital signal processing · Hybrid control · Maximum power point (MPP) · Maximum power point tracking (MPPT) · Photovoltaic (PV)
1 Introduction The fossil fuels and nuclear energy that are currently the world’s main energy sources cause environmental pollution and risk issues. Because of this, interest is increasing in using renewable-energy methods that can recycle fossil fuels or regenerate energy. According to the International Renewable Energy Agency (IRENA), the photovoltaic (PV) power-generation capacity in 2017 was 386,107 [MW], and in 2018, it was 480,357 [MW]. It had the largest increase among all of the renewable-energy generation systems [1]. * Jin‑Geun Shon [email protected] Dong‑Eun Kim [email protected] Hyun‑Jae Lee [email protected] Hak‑Ryong Moon [email protected] 1
Department of Electrical Engineering, Gachon University, Seongnam, Korea
Department of Future Technology and Convergence Research, Korea Institute of Civil Engineering and Building Technology, Goyang, Korea
2
A photovoltaic power-generation system uses solar cells, which convert sunlight directly into electricity. The conversion efficiency of the solar cells currently being commercialized is low, less than about 20 [%]. A solar panel made of these solar cells has a non-linear power-voltage (P–V) curve. Unfortunately, it is sensitive to the surrounding environment, e.g., irradiance and temperature changes. Because of this characteristic, the solar panel must be controlled to maximize its power generation. This control is called maximum power-point tracking (MPPT). Many MPPT methods have been studied, thus far, and methods to quickly and accurately find the point that can generate the maximum power and obtain a stable waveform are currently being studied [2]. For MPPT, perturb and observe (P&O) and incre
Data Loading...
