scholarly journals Optimal feedforward torque control for nonlinear induction machines considering stator & rotor copper losses and current & voltage limits

2021 ◽  
Author(s):  
Christoph Hackl ◽  
Andre Thommessen
Keyword(s):  
Induction Machine ◽  
Induction Machines ◽  
Optimal Operation ◽  
Torque Control ◽  
Lagrangian Formalism ◽  
Maximum Torque ◽  
Optimal Feed ◽  
Doubly Fed Induction Machine ◽  
Doubly Fed ◽  
Copper Losses

In order to analytically solve the optimal feed-<br>forward torque control (OFTC) problem of induction machines (IMs), the unified theory for synchronous machine introduced in [1] is extended by considering relevant IM nonlinearities and incorporating stator and rotor copper losses. Instead of the well known Maximum Torque per (stator) Current (MTPC) operation strategy, Maximum Torque per (copper) Losses (MTPL Cu ) is realized and extended by the Maximum (rotor) Current (MC r, ext ) strategy due to stator and rotor current limitations. Modeling magnetic saturation and cross-coupling effects leads to a con-<br>strained nonlinear optimization problem which is solved based on the idea of sequential quadratic programming (SQP). The second order Taylor approximations are formulated in implicit form as quadrics. Applying the Lagrangian formalism to the quadratic problem leads to analytical solution for the optimal rotor currents. For a doubly-fed induction machine (DFIM), a decision tree for optimal operation management is presented and the OFTC is validated in simulations for a real nonlinear IM.

scholarly journals Optimal feedforward torque control for nonlinear induction machines considering stator & rotor copper losses and current & voltage limits

2021 ◽  
Author(s):  
Christoph Hackl ◽  
Andre Thommessen
Keyword(s):  
Induction Machine ◽  
Induction Machines ◽  
Optimal Operation ◽  
Torque Control ◽  
Lagrangian Formalism ◽  
Maximum Torque ◽  
Optimal Feed ◽  
Doubly Fed Induction Machine ◽  
Doubly Fed ◽  
Copper Losses

In order to analytically solve the optimal feed-<br>forward torque control (OFTC) problem of induction machines (IMs), the unified theory for synchronous machine introduced in [1] is extended by considering relevant IM nonlinearities and incorporating stator and rotor copper losses. Instead of the well known Maximum Torque per (stator) Current (MTPC) operation strategy, Maximum Torque per (copper) Losses (MTPL Cu ) is realized and extended by the Maximum (rotor) Current (MC r, ext ) strategy due to stator and rotor current limitations. Modeling magnetic saturation and cross-coupling effects leads to a con-<br>strained nonlinear optimization problem which is solved based on the idea of sequential quadratic programming (SQP). The second order Taylor approximations are formulated in implicit form as quadrics. Applying the Lagrangian formalism to the quadratic problem leads to analytical solution for the optimal rotor currents. For a doubly-fed induction machine (DFIM), a decision tree for optimal operation management is presented and the OFTC is validated in simulations for a real nonlinear IM.

scholarly journals The cascade methods of doubly-fed induction machine for generator system

2021 ◽  
Vol 12 (1) ◽  
pp. 112
Author(s):  
Diep-Dung Nguyen ◽  
Ngoc-Hoan Than ◽  
Duc-Tuan Hoang
Keyword(s):  
Power Control ◽  
Output Voltage ◽  
Induction Machine ◽  
Induction Machines ◽  
Control Circuit ◽  
Generator System ◽  
Power Generator ◽  
Analysis And Evaluation ◽  
Doubly Fed Induction Machine ◽  
Doubly Fed

This paper presents two solutions to cascade the doubly-fed induction machines in the power generator systems. The first solution is a traditional one with the power control circuit located on the stator-side. The second solution is a new one with the power control circuit located on the rotor-side. After analysis and evaluation, it is shown that the solution with the power control circuit located on the rotor side has advantages over the solution with the power control circuit located on the stator-side. Therefore, the authors chose the solution which is a power control circuit located on the rotor side to study, analyze in-depth and run the simulation. The results show that the proposed solution has a very good quality, the output voltage of the generator always follows the grid-voltage even when changing the gird-voltage or changing the speed of the generator.

scholarly journals Fuzzy super twisting algorithm dual direct torque control of doubly fed induction machine

2021 ◽  
Vol 11 (5) ◽  
pp. 3782
Author(s):  
Boumaraf Farid ◽  
Boutabba Tarek ◽  
Belkacem Sebti
Keyword(s):  
Fuzzy Logic ◽  
Sliding Mode ◽  
Direct Torque Control ◽  
Induction Machine ◽  
Torque Control ◽  
Doubly Fed Induction Machine ◽  
Signum Function ◽  
Simulation Results ◽  
Doubly Fed ◽  
Twisting Algorithm

<span>This paper proposes the fundamental aspects of hybrid nonlinear control which is composed of the super twisting algorithm (STA) based second order sliding mode control applying fuzzy logic method (FSOSMC), with pertinent simulation results for a doubly fed induction machine (DFIM) drive. To minimize chattering effect phenomenon due to Signum function employed in sliding mode algorithm, a new method is proposed. This technique consists in replacing the signum function by fuzzy switching function in the SOSMC to minimize flux and torque ripples. This FSOSMC is associated to the double direct torque control DDTC of the doubly fed induction machine (DFIM) by combining the advantages of fuzzy logic (FL) and the advantages of super-twisting sliding mode. The FSOSMC-DDTC strategy is compared with a PI-DDTC and SOSMC-DDTC. Simulation results demonstrate good efficiency and excellent robustness of the hybrid nonlinear controller.</span>

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