Systematic analysis and design of a sliding mode controller for Z_Source inverters used in renewable energy systems

Subject Areas : Electrical engineering (electronics, telecommunications, power, control)

مجید رضا ناصح ¹ (عضو هیات علمی دانشگاه ازاد اسلامی بیرجند)
Shahabadi Gholamreza ² (Department of Electrical Engineering, University of Applied Science and Technology, South Khorasan Branch, Iran)
Fatemeh Bidar ³ (Department of Computer Engineering, University of Applied Science and Technology, South Khorasan Branch, Iran)

Received: 2024-03-04 Accepted : 2024-06-17 Published : 2024-09-21

Keywords: Z-Source inverters, Renewable energy sources, Sliding mode control, Robust control ,

Abstract :

Z-source inverters have become more popular because of their desirable features, such as the capability to boost voltage over a wide range, high resistance to EMI noise, and protection from short circuit. These features make this inverter suitable for renewable energy systems such as wind power plants, fuel cells, and solar systems. A control method that is robust to the common changes in renewable energy systems, such as production voltage, output load, and output reference voltage, is required. Using a small signal approximation around a specific point, a linear controller cannot ensure the stability of a nonlinear system over a large range. This article proposes a sliding mode controller to regulate the DC voltage of a Z-Source inverter that connects to a single-phase grid. The article presents a systematic approach for selecting the parameters of the proposed sliding mode controller. The capacitor voltage is indirectly regulated by the DC-side inductor current for the non-minimum phase of the inverter transfer function. The objective of this article is to introduce a systematic approach for selecting controller parameters in a non-linear sliding mode controller. The proposed controller can track the reference voltage despite the changes in input voltage, output load, and reference voltage, and is robust to the changes mentioned earlier. The simulations were performed using MATLAB/Simulink and the results confirmed the capabilities of the proposed controller.

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