Abstract
The subject of this paper pertains to sliding mode control and its application in nonlinear electrical power systems as seen in wind energy conversion systems. Due to the robustness in dealing with unmodeled system dynamics, sliding mode control has been widely used in electrical power system applications. This paper presents first and high order sliding mode control schemes for permanent magnet synchronous generator-based wind energy conversion systems. The application of these methods for control using dynamic models of the d-axis and q-axis currents, as well as those of the high speed shaft rotational speed show a high level of efficiency in power extraction from a varying wind resource. Computer simulation results have shown the efficacy of the proposed sliding mode control approaches.
Highlights
Concerns over the environmental impacts and scarcity of fossil fuels have led to increased usage and growing demand of alternative energy resources, such as wind and solar energy
As wind energy conversion systems (WECS) have moved away from the doubly-fed induction generators (DFIGs) and more towards permanent magnet synchronous generators (PMSGs), even further emphasis has been placed on efficient control strategies due to the high price and complexity of typical aerodynamic control systems [6]
The implementation of the wind turbine aerodynamics, PMSG dynamics and sliding mode control (SMC) control architecture in MATLAB SIMULINK is shown by Figure 5
Summary
Concerns over the environmental impacts and scarcity of fossil fuels have led to increased usage and growing demand of alternative energy resources, such as wind and solar energy. For WECS employing DFIGs, SMC applied to torque control demonstrates high MPPT with low variations in torque. The usefulness of this control method extends into synchronous machines, as well. Due to the non-idealities in switching devices, the response of the system under SMC oscillates about the desired reference, known as the sliding surface This leads to higher mechanical wear, lower accuracy and heat loss in power circuits. Advances in generalizing the sliding mode control to these higher orders have allowed the system to maintain high accuracy and robustness while still reducing the effect of chattering [25,26,27].
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