Overlap Time Compensation and Characteristic Analysis for Current Source Photovoltaic Grid-Connected Inverter

Cheng Xu, Ping Liu () and Yiru Miao
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Cheng Xu: Jihua Laboratory, Foshan 528251, China
Ping Liu: Innovation Institute of Industrial Design and Machine Intelligence, Hunan University, Quanzhou 362006, China
Yiru Miao: Innovation Institute of Industrial Design and Machine Intelligence, Hunan University, Quanzhou 362006, China

Energies, 2024, vol. 17, issue 7, 1-18

Abstract: In the current source photovoltaic grid-connected system, to prevent the DC-link inductor from incurring an opening circuit fault, it is necessary to include the overlap time in the switching signals. However, current error and serious harmonic distortion in the inverter-side and grid-side currents are generated, which will cause additional losses and reduce the power quality of the grid, so it is important to compensate for the current error caused by the overlap time. In this paper, the relationship between the nonlinear current errors caused by the overlap time and the AC-side voltage is analyzed. Then, the mathematical expression of the low-order harmonics with losses caused by the overlap time is derived. On this basis, a current error compensation method with a discrete filter of AC-side voltage is proposed. Finally, a simulation and experiment are carried out to verify the correctness and effectiveness of the theoretical analysis and compensation scheme presented in this paper. With an overlap time of 3 μs, the THD of the grid-side current decreases from 5.93% to 1.59% after compensation.

Keywords: current source inverter; overlap time; harmonic distortion; compensation scheme (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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