Abstract
The grid interconnected Wind Energy Conversion System (WECS) remains a major challenge. To deal with the effect of the intermittent nature of wind speed. This paper presents the design of a combined nonlinear controller based on a sliding mode controller (MSMC) for a wind system. This control technique includes a smooth switching sliding mode observer (SS-SMO) and a non-singular terminal sliding mode controller (NT-SMC). The SS-SMO is used to observe the torque/speed disturbances, while the NT-SMC is used as a regulator. A voltage control technique is adopted to maintain the voltage at the common DC-link. To control the electrical power injected into the grid a Backstepping controller is proposed. The WECS is built around a wind turbine coupled to a Permanent Magnet Synchronous Generator (PMSG). The proposed technique is robust against model uncertainties and external disturbances. In addition, the complexity of the system is reduced by replacing the mechanical speed and position sensors with the estimated parameter. The simulations results show the performances in terms of monitoring of set point, stability, and robustness with respect to the variation of wind speed.
Highlights
The wind generator proposed in this study is a permanent magnet synchronous generator due to its advantages in terms of variable speed and low-frequency converter back-to-back converter
Permanent Magnet Synchronous Generator (PMSG) have proven to be an appropriate option among the generators available for Wind Turbine Conversion System (WTCS) because they eliminate the need for an additional gearbox and slip ration [3, 4]
The GSC is operated using a power control technique because when the WEC system is integrated into the electrical network, the reactive power flow sent to the network must be managed, for this, we propose a new nonlinear algorithm based on the adaptative Backstepping controller
Summary
The wind generator proposed in this study is a permanent magnet synchronous generator due to its advantages in terms of variable speed and low-frequency converter back-to-back converter. WECS works effectively when used with a fully controlled source side converter (SSC), embedded with appropriate control logic This configuration facilitates the extraction of optimum wind energy within a certain wind speed range by regulating the speed of the shaft. The main objective of the designed control is to treat these unknown disturbances These are introduced because of the unpredictable wind speed and reduce the problem of interference in the system, which is the major drawback of conventional SMC systems. The SMC is used to track the maximum power of the wind turbine by regulating the PMSG speed with the possibility of disturbance compensation. It includes SS-SMO with fast and finite convergence. The GSC is operated using a power control technique because when the WEC system is integrated into the electrical network, the reactive power flow sent to the network must be managed, for this, we propose a new nonlinear algorithm based on the adaptative Backstepping controller
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