Abstract
A digital H∞ controller for a permanent magnet synchronous generator (PMSG) based wind energy conversion system (WECS) is presented. Wind energy is an uncertain fluctuating resource which requires a tight control management. So, it is still an exigent task for the control design engineers. The conventional proportional-integral (PI) control is not ideal during high turbulence wind velocities, and the nonlinear behavior of the power converters. These are raising interest towards the robust control concepts. The robust design is to find a controller, for a given system, such that the closed-loop system becomes robust that assurance high-integrity and fault tolerant control system, robust H∞ control theory has befallen a standard design method of choice over the past two decades in industrial control applications. The robust H∞ control theory is also gaining eminence in the WECS. Due to the implementation complexity for the continuous H∞ controller, and availability of the high speedy micro-controllers, the design of a sample-data or a digital H∞ controller is very important for the realistic implementation. But there isn’t a single research to evaluate the performance of the digital H∞ controller for the WECS. In this paper, the proposed digital H∞ controller schemes comprise for the both generator and grid interactive power converters, and the control performances are compared with the conventional PI controller and the fuzzy controller. Simulation results confirm the efficacy of the proposed method Energies 2013, 6 2085 which are ensured the WECS stabilities, mitigate shaft stress, and improving the DC-link voltage and output power qualities.
Highlights
Over the period 1990–2010, fossil fuels contributed 83% of the growth in energy.Due to the crisis of exhausting fossil fuels and considering the green-house effect, it is predicted that over the twenty years, fossil fuels contribute 64% of the growth in energy
This paper presents a digital H∞ controller based grid connected wind energy conversion system (WECS)
The parameters of the wind turbine, permanent magnet synchronous generator (PMSG) and power converters are given in APPENDIX
Summary
Over the period 1990–2010, fossil fuels (e.g., oil, coal, gas) contributed 83% of the growth in energy. Closed-loop stabilities are guaranteed only for the small-range of parameters deviation Taking into account of the power producing capacity of the modern WECS (2–5 MW), the high turbulence wind velocities, and the parameter uncertainties, the researchers have prompted to interest in the robust control concepts (e.g., H2 or H∞ controllers). The robust H∞ controller formulation for the WECS is adopted in [3,14,15,16,17], to improve the performance at the high turbulence wind velocities, or parameter uncertainties. Described is a comprehensive and systematic way of implementing a new methodology of H∞ control design algorithm for a 2 MW PMSG based WECS in a power system.
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