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Article

High Efficiency Solar Power Generation with Improved Discontinuous Pulse Width Modulation (DPWM) Overmodulation Algorithms

1
College of Electrical and Power Engineering, Taiyuan University of Technology, Shanxi 030024, China
2
Electrical Engineering School, Guizhou University, Guiyang 550025, China
3
Faculty of Engineering, Cardiff University, Cardiff CF24 3AA, UK
4
School of Engineering and Applied Science, Aston University, Birmingham B4 7ET, UK
*
Authors to whom correspondence should be addressed.
Energies 2019, 12(9), 1765; https://doi.org/10.3390/en12091765
Received: 26 February 2019 / Revised: 24 April 2019 / Accepted: 7 May 2019 / Published: 9 May 2019
(This article belongs to the Special Issue Design and Control of Power Converters 2019)
The efficiency of a photovoltaic (PV) system strongly depends on the transformation process from solar energy to electricity, where maximum power point tracking (MPPT) is widely regarded as a promising technology to harvest solar energy in the first step. Furthermore, inverters are an essential part of solar power generation systems. Their performance dictates the power yield, system costs and reliable operation. This paper proposes a novel control technology combining discontinuous pulse width modulation (DPWM) and overmodulation technology to better utilize direct current (DC) electrical power and to reduce the switching losses in the electronic power devices in conversion. In order to optimize the performance of the PV inverter, the overmodulation region is refined from conventional two-level space vector pulse width modulation (SVPWM) control technology. Then, the turn-on and turn-off times of the switching devices in different modulation areas are deduced analytically. A new DPWM algorithm is proposed to achieve the full region control. An experimental platform based on a digital signal processing (DSP) controller is developed for validation purposes, after maximum power is achieved via a DC/DC converter under MPPT operation. Experimental results on a PV system show that the DPWM control algorithm lowers the harmonic distortion of the output voltage and current, as well as the switching losses. Moreover, better utilization of the DC-link voltage also improves the PV inverter performance. The developed algorithm may also be applied to other applications utilizing grid-tie power inverters. View Full-Text
Keywords: DPWM; MPPT; photovoltaic power system DPWM; MPPT; photovoltaic power system
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MDPI and ACS Style

Li, L.; Wang, H.; Chen, X.; Bukhari, A.A.S.; Cao, W.; Chai, L.; Li, B. High Efficiency Solar Power Generation with Improved Discontinuous Pulse Width Modulation (DPWM) Overmodulation Algorithms. Energies 2019, 12, 1765. https://doi.org/10.3390/en12091765

AMA Style

Li L, Wang H, Chen X, Bukhari AAS, Cao W, Chai L, Li B. High Efficiency Solar Power Generation with Improved Discontinuous Pulse Width Modulation (DPWM) Overmodulation Algorithms. Energies. 2019; 12(9):1765. https://doi.org/10.3390/en12091765

Chicago/Turabian Style

Li, Lan, Hao Wang, Xiangping Chen, Abid A.S. Bukhari, Wenping Cao, Lun Chai, and Bing Li. 2019. "High Efficiency Solar Power Generation with Improved Discontinuous Pulse Width Modulation (DPWM) Overmodulation Algorithms" Energies 12, no. 9: 1765. https://doi.org/10.3390/en12091765

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