Abstract
In this paper, a robust nonlinear controller based on integral sliding mode control (ISMC) strategy was proposed to maximize the captured energy for a variable speed wind turbine (VSWT). In order to reduce the reaching phase, an integral action is introduced in the switching surface of the sliding mode control (SMC) for a minimum steady state error. The controlled system stability is demonstrated using the Lyapunov theory and the trajectory tracking error converges in finite time to zero without any chattering problems. Various simulations, carried out via Matlab software, are discussed to highlight the proposed method performance, using a nonlinear single mass model. Finally, the simulation results show that the proposed Integral SMC strategy ensures better response speed and smaller steady-state error compared to the standard SMC.
Highlights
Wind energy is an abundant renewable source of new electrical generation capacity in the world, and it is exploited by converting the kinetic energy of moving air mass into electricity; it is necessary to introduce tools to make the wind turbine (WT) more profitable [1]
This paper presents a robust rotor speed tracking controller allowing variable speed wind turbine (VSWT) to capture maximum wind energy
This paper addressed the robust optimal reference tracking problem for a variable speed wind turbine, in order to maximize the power extracted of the wind
Summary
Wind energy is an abundant renewable source of new electrical generation capacity in the world, and it is exploited by converting the kinetic energy of moving air mass into electricity; it is necessary to introduce tools to make the wind turbine (WT) more profitable [1]. The sliding mode control (SMC) [4-6], is widely used in many applications, especially, the control of a variable speed wind turbine (VSWT). This is due to its property of robustness with respect to uncertainties and disturbances [7,8]. The integral sliding mode control (ISMC) [9-11], is a robust control for improving the performance of standard sliding mode control It is to design a sliding surface such that it is zero when the initial time. Due to the integral action introduced into the sliding surface, the ISMC guarantees greater robustness by eliminating the static error and by improving the performances of the controlled system in term of reaching phase and tracking error level.
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