Backstepping Control Based on a Third-order Sliding Mode Controller to Regulate the Torque and Flux of Asynchronous Motor Drive

This work represents a new nonlinear control for the asynchronous motor (AM) drive. The designed nonlinear control is based on the combination between the backstepping control (BC) scheme and third-order sliding mod control (TOSMC). In this proposed nonlinear control, the torque and flux are controlled. Also, the torque, current, and flux ripples are minimized by a proposed BC-TOSMC strategy. The proposed BC-TOSMC strategy is more robust compared to the field-oriented control (FOC). The proposed BC-TOSMC strategy of AM drive has been simulated in MATLAB/Simulink software. The comparisons were made between the proposed BC-TOSMC strategy and the FOC strategy under different operating conditions. The results show that the proposed BC-TOSMC strategy minimized the flux, current, and torque ripples of the AM drive compared to the FOC strategy, with a reduction torque ripples ratio of about 57.14%. Also, the total harmonic distortion (THD) values of stator current using the proposed BC-TOSMC strategy and FOC technique are respectively 1.09% and 3.42%. In this case, utilizing the proposed BC-TOSMC strategy, the performance of the AM has improved from the FOC strategy

Robust synergetic-sliding mode-based-backstepping control of induction motor with MRAS technique

This paper proposes a new speed control of an induction motor (IM) drive, which is based the combination between the backstepping control (BC) and synergetic-sliding mode controller (SSMC). In addition, it was proposed to use the Model Reference Adaptation System (MRAS) to estimate the IM speed with the aim of reducing speed error and increasing the performance and efficiency of the proposed system. IM has already been considered for many applications, especially traction systems that mainly use proportional-integral controllers. However, such types of controllers do not handle well in the event of a system malfunction. These may reduce the performance of the control system. Therefore, a robust nonlinear control, namely BC-SSMC with MRAS, is proposed. This control relies on combining the advantages of both BC and SSMC to control the IM speed. Also, the MRAS was used to replace the speed sensor with the aim of reducing the periodic maintenance of this sensor and thus reducing the size and cost of the system. The robustness of the BC-SSMC-MRAS was analyzed with respect to the occurrence of system malfunctions, as it is considered the most robust compared to BC. The simulation results performed on the 1.5 kW IM showed the effectiveness of the BC-SSMC-MRAS in enhancing the system durability, reducing the torque ripples and improving the current quality. In all tests performed, the speed overshoot value was improved by 100 % compared to the BC. Also, the torque and flux ripples in the event of a machine malfunction are improved by 50 % and 77.14 %, respectively, compared to the BC. In the speed change test, the response time and steady-state error of speed values were improved by 5.26 % and 67.56 %, respectively. So all these ratios prove the superiority of the BC-SSMC-MRAS over the BC in terms of improving system performance

A new PI(1 +PI) controller to mitigate power ripples of a variable-speed dual-rotor wind power system using direct power control

This work presents a new scheme of direct power command (DPC) of induction generator (IG)-based dual-rotor wind power (DRWP) systems. The suggested DPC employs a proportional-integral (1 + proportional-integral) controller (PI(1 +PI)) to regulate the IG power so as to improve the energy quality and reduces the current ripples. Ease of implementation, robustness, and simplicity are three of the biggest advantages of the proposed DPC-PI(1 +PI) technique due to the absence of additional current command loops. Also, the use of the designed PI(1 +PI) in this work leads to an improvement in both the transient performance and the overshoot of the generated energy. The IG inverter is controlled using pulse width modulation (PWM), which makes the IG-DRWP system simpler and more cost-effective to implement. Numerical results on a 1.5-MW IG-DRWP system are analyzed and compared with the DPC technique. The DPC-PI(1 +PI) improves the overshoot and steady-state error of active and reactive power compared to the DPC. As compared to the DPC, the proposed DPC-PI(1 +PI) strategy improves the current, torque, active and reactive power ripples by 54.54%, 53.43%, 63.33% and 52.98%, respectively. The designed DPC-PI(1 +PI) technique reduces the harmonic distortion of current by about 50% compared to the DPC strategy. Also, improves the steady-state error of the active and reactive power by 79.55% and 52.98%, respectively. The numerical results obtained from this work demonstrate the efficiency and effectiveness of the proposed strategy in all tests of a variable speed DRWP system based on IG compared to DPC control

Active and reactive power vector control using neural-synergetic-super twisting controllers of induction generators for variable-speed contra-rotating wind turbine systems

Reactive and active power vector control of induction generators (IG) are essential requirements for generating high-quality electricity from wind power. These control objectives are challenging and difficult to achieve when using traditional strategies based on estimating reactive/active power, hysteresis comparators, and proportional-integral (PI) regulators due to load variations, changes in the value of rotor resistance, etc. So, to achieve these control objectives, this paper proposes a novel technique for the rotor side converter of IG-based contra-rotating wind power (CRWP) systems. The control based on the neural synergetic-super-twisting controller (NSSTC) is designed to minimize IG power ripples and improve the quality of current. The characteristics of the NSSTC-based strategy are presented, evaluated, and compared to the traditional direct field-oriented command (DFOC) based on traditional PI controllers and other reference techniques from the literature, highlighting that the NSSTC-based strategy is simpler to apply and more robust and performant than others classical nonlinear strategies. Comparative simulations are carried out on both the designed DFOC-NSSTC strategy and the DFOC technique to demonstrate the performance (good quality output power, low total harmonic distortion (THD) value of rotor currents, short response time and high robustness) and advantages of the suggested nonlinear technique