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Two-Stage Control for Small-Signal Modeling and Power Conditioning of Grid-Connected Quasi-Z-Source Inverter with LCL Filter for Photovoltaic Generation | ||
| Journal of Operation and Automation in Power Engineering | ||
| دوره 9، شماره 3، اسفند 2021، صفحه 242-255 اصل مقاله (1.27 M) | ||
| نوع مقاله: Research paper | ||
| شناسه دیجیتال (DOI): 10.22098/joape.2021.7674.1546 | ||
| نویسندگان | ||
| F. Aalizadeh1؛ M. Hosseinpour* 1، 2؛ A. Dejamkhooy3؛ H. Shayeghi4، 2 | ||
| 1Department of Electrical and Computer Engineering, University of Mohaghegh Ardabili, Ardabil, Iran | ||
| 2Energy Management Research Center, University of Mohaghegh Ardabili, Ardabil, Iran. | ||
| 3Department of Electrical and Computer Engineering, University of Mohaghegh Ardabili, Ardabil, Iran. | ||
| 4Department of Electrical and Computer Engineering, University of Mohaghegh Ardabili, Ardabil, Iran. | ||
| چکیده | ||
| Grid-connected inverter-based photovoltaic (PV) systems play an important role in Distributed Power Generation (DPG). For this application, quasi impedance source inverter is very suitable due to its ability to increase or decrease the output voltage of the inverter in a single-stage and high reliable condition. Conventionally, to remove the harmonics, which are yielded by switching the grid-connected inverter, LCL filters are utilized at the inverter output. These filters can cause some problems at the Point of Common Coupling (PCC). The aim of this paper is to improve the quality of the injected power of the photovoltaic array, which is connected to the low voltage grid by quasi-Z-source inverter (QZSI). For this purpose, a two-stage control procedure containing DC and AC stages is performed. In the DC stage, the dynamic characteristics of the quasi-Z-source network are investigated by small-signal analysis. Using the transfer functions obtained from the dynamic model, the capacitor voltage of the quasi-Z-source network is suitably controlled to generate the appropriate voltage to the grid interface inverter. In the AC stage, in order to inject high-quality current into the grid as well as eliminating the resonance peak caused by the LCL filter, a systematic procedure is used to design the PR controller parameters and active damping coefficient. Simulation of the overall system includes solar panels, maximum power point tracking algorithm, quasi-Z-source inverter, and LCL filter to model the grid-tied PV system with the possible details. Simulations are carried out in MATLAB/Simulink environment, and results depict suitable performance of the studied power conditioning system with designed parameters. | ||
| کلیدواژه‌ها | ||
| Small-signal modeling؛ Quasi-Z-source inverter؛ PR controller؛ LCL filter؛ THD | ||
| مراجع | ||
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