Abstract
A permanent magnet synchronous generator (PMSG) in s grid-connected tidal energy conversion system presents numerous advantages such as high-power density and ease of maintenance. However, the nonlinear properties of the generator and parametric uncertainties make the controller design more than a simple challenge. Within this paper we present a new combined passivity-based voltage control (PBVC) with a nonlinear observer. The PBVC is used to design the desired dynamics of the system, while the nonlinear observer serves to reconstruct the measured signals. A high order sliding-mode based fuzzy supervisory approach is selected to design the desired dynamics. This paper addresses the following two main parts: controlling the PMSG to guarantee the maximum tidal power extraction and integrate into to the grid-side converter (GSC), for this the new controller is proposed. The second task is to regulate the generated reactive power and the DC-link voltage to their references under any disturbances related to the machine-side converter (MSC). Furthermore, the robustness of the controller against parameter changes was taken into consideration. The developed controller is tested under parameter variations and compared to benchmark nonlinear control methods. Numerical simulations are performed in MATLAB/Simulink which clearly demonstrates the robustness of the proposed technique over the compared control methods. Moreover, the proposed controller is also validated using a processor in the loop (PIL) experiment using Texas Instruments (TI) Launchpad.
Highlights
Β denotes the pitch angle, vt is the tidal speed, ρ represents water density, λ denotes the tip-speed ratio, Cp represents the power coefficient, A denotes the swept area of the blades, R denotes the radius of the blades, and ωm represents the speed of the rotor
In the closed loop system, the positive definite matrix Bi increases the convergence of the tracking error and it overcomes the imprecise knowledge of system parameters
DCthe and the presented it is that, obvious linkDC-link voltage voltage trackingtracking responseresponse and from thefrom presented results itresults is obvious withthat, the with the proposed few oscillations transient oscillations are observed as compared toand the proposed controller,controller, few transient are observed as compared to the sliding-mode control (SMC)
Summary
Due to low maintenance costs the permanent magnet sonorous generator (PMSG)-based tidal conversion system is integrated into the grid using back to back converters. In [8], a jaya-based sliding mode approach is proposed to enhance the performance of a tidal conversion system. The present paper investigates a new passivity-based voltage controller and nonlinear observer via a combined fuzzy gain supervisory-high order sliding mode approach. A passivity-based voltage control is developed in [5]; as mentioned by the authors, the new controller shows a small sensitivity to the variation of the mechanical parameters. A new adaptive fuzzy supervisory-high order sliding mode passivity-based combined voltage control and nonlinear observer for optimal performance of a PMSG is developed.
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