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Abstract
Connecting renewable energy-based distributed generations (DGs) through a DC-Link can create autonomous power supply units (APSUs). Three phase four-leg inverter is a beneficial solution to supply unbalanced loads which is inevitable in a typical APSU. The four-leg inverter can provide sinusoidal-shaped voltages but a high performance control method should be used. Sliding mode control (SMC) is a well-known non-linear control method with high robustness, high stability in a wide range of operation and fast dynamic response. However, it mainly suffers from high chattering problem, variable switching frequency and steady-state error which deteriorate all the previous advantages. In this paper, first, detailed model of the four-leg inverter in the abc reference frame considering the inductor series resistance is derived. Second, a high performance SMC method with zero steady-state error, fixed switching frequency and considerably reduced chattering voltage is proposed to control the output voltage of the four-leg inverter. The proposed method guarantees fast dynamic response and high robustness against model parameter mismatches and load variations. Finally, an improved SMC is also proposed to attenuate the chattering problem more effectively. Several experimental results on a 3-kW test bench are presented to verify the superior performance of the proposed methods.
Additional information
Notes on contributors
Mohammad Pichan
Mohammad Pichan received his BS in electronic engineering from University of Isfahan, Isfahan, Iran, in 2010. He finished his MS in electrical engineering at Amirkabir University of Technology, Tehran, Iran, in 2012. He received his PhD degree in electrical engineering at Amirkabir University of Technology, Tehran, Iran, in 2017. He is currently research assistant at the Iranian Research Institute of Electrical Engineering working on medium and high power converter design. His research interests include rectifiers, inverters, power electronics and its applications in renewable energies. Corresponding author. Email: [email protected]
Hasan Rastegar
Hasan Rastegar received the BSc, MSc and PhD degrees in electrical engineering from the Amirkabir University of Technology, Tehran, Iran, in 1987, 1989 and 1998, respectively. Currently, he is a full professor in the Department of Electrical Engineering, Amirkabir University of Technology. He has published more than 90 papers in journals and conferences. His research interests include power system control, application of computational intelligence in power systems, simulation and analysis of power systems and renewable energy.Email: [email protected]