Abstract
To enhance the robustness and dynamic performance of a self-excited induction generator (SEIG) used in a stand-alone wind energy system (WES), a virtual flux oriented control (VFOC) based on nonlinear super-twisting sliding mode control (STSMC) is adopted. STSMC is used to replace the conventional proportional-integral-Fuzzy Logic Controller (PI-FLC) of the inner current control loops. The combination of the proposed control strategy with space vector modulation (SVM) applied to a PWM rectifier brings many advantages such as reduction in harmonics, and precise and rapid tracking of the references. The performance of the proposed control technique (STSMC-VFOC-SVM) is verified through simulations and compared with the traditional technique (PI-FLC-VFOC-SVM). It shows that the proposed method improves the dynamics of the system with reduced current harmonics. In addition, the use of a virtual flux estimator instead of a phase-locked loop (PLL) eliminates the line voltage sensors and thus increases the reliability of the system.
Highlights
A quarter of world’s population live in rural villages and isolated sites where most are not connected to electrical networks
In [5,6,7,8,9], a vector controlled back-to-back converter is used between the self-excited induction generator (SEIG) and the load, while a simplified system with Pulse-Width modulation (PWM) rectifier and the load connected to its output in parallel with the Direct current (DC) bus voltage has been proposed
The absence of the current control loop and park transformation makes the implementation of the Direct torque control (DTC) control simpler than the Voltage oriented control (VOC), while it manifests itself by the rapid dynamic response
Summary
A quarter of world’s population live in rural villages and isolated sites where most are not connected to electrical networks. Another control technique proposed and implemented in [14] is composed of a diode bridge rectifier and a filter, and a PWM inverter The purpose of this technique is to stabilize the amplitude and frequency output of the inverter for an autonomous energy generation system. The absence of the current control loop and park transformation makes the implementation of the DTC control simpler than the VOC, while it manifests itself by the rapid dynamic response It has major drawbacks, such as the determination of switching states has to be based on information on the trends in flux and torque evolution from non-linear elements of the hysteresis type, and the variable switching duration, which leads to torque oscillations. VFOC provides better control of the rectifier under poor line voltage conditions (operation without an AC voltage sensor presents less noise because of the low pass filter behavior of the integrator used in the flux estimator)
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