H∞ loop-shaping controller design for a grid-connected single-phase photovoltaic system |
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| Authors: | Md Ayaz Chowdhury Saad Bin A Kashem |
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| Institution: | 1. School of Engineering and Information Technology, Murdoch University, Murdoch, Australia;2. School of Engineering, Swinburne University of Technology Sarawak Campus, Kuching, Malaysia |
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| Abstract: | This paper presents a H∞ loop-shaping controller for controlling dc-link voltage by regulating the switching signal of the inverter associated with a grid-connected single-phase photovoltaic system. To facilitate a robust control design, state-space realisation of the system model is made with uncertainties represented by linear fractional transformation. The controller is achieved through H∞ synthesis followed by obtaining desired loop shapes through the choice of the proper weighting functions. The controller order is reduced by Henkel-norm method for facilitating its practical implementation. Controller performance is evaluated through carrying out simulations on MATLAB/Simulink platform under standard and changing atmospheric conditions, and fault condition. |
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| Keywords: | H∞ loop-shaping control linear fractional transformation single-phase photovoltaic system state-space realisation |
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