A backstepping high-order sliding mode voltage control strategy for an islanded microgrid with harmonic/interharmonic loads |
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| Affiliation: | 1. School of Information and Software Engineering, University of Electronic Science and Technology of China, Chengdu 611731, PR China;2. Department of Applied Mathematics, University of Waterloo, Waterloo, N2L 3G1, Canada;3. School of Automation Science and Engineering, South China University of Technology, Guangzhou 510640, PR China;4. Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, PR China;5. School of Mathematics Sciences, University of Electronic Science and Technology of China, Chengdu 611731, PR China;6. School of Information Science and Engineering, Chengdu University, Chengdu 610106, PR China |
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| Abstract: | This paper presents a new nonlinear voltage control strategy based on backstepping control and a high-order sliding mode differentiator for an islanded microgrid. The microgrid consists of multiple distributed generation (DG) units with an arbitrary configuration that can be parametrically uncertain or topologically unknown. The proposed controller robustly regulates the microgrid voltages in the presence of parametric uncertainties, unmodeled dynamics, load imbalances, and nonlinear loads with harmonic/interharmonic currents. In contrast to existing methods, the controller does not need to know the frequency of harmonic and interharmonic current of microgrid loads that lead to the reduction of the steady-state error of the voltage controller in the frequency of unknown harmonics and interharmonics. The MATLAB/SimPowerSystems toolbox has verified the proposed control strategy's performance. |
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| Keywords: | Backstepping control High-order sliding mode differentiator Interharmonic current Microgrid Unbalanced and nonlinear loads |
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