Optimal Duty Cycle Model Predictive Current Control of High-Altitude Ventilator Induction Motor With Extended Minimum Stator Current Operation

A control strategy for a bearingless induction motor (BL-IM) based on the fuzzy dynamic objective function is proposed in this paper. Firstly, based on the discrete mathematical model of the BL-IM, the stator current and flux linkage are predicted according to the given stator current and flux linkage, the objective function of model predictive current control (MPCC) is designed. Secondly, the fuzzy control algorithm is introduced in the objective function of the MPCC to dynamically assign the weighting factors before the current component on the d- q axis and the influence of the objective function on the performance of the BL-IM is analyzed under different weighting factors. By discretizing the rotational speed deviation Δ ω and rotational speed deviation rate, fuzzy reasoning is performed to obtain the optimal fuzzy dynamic function. Finally, the optimal fuzzy dynamic function is selected as the objective function of the MPCC to perform the simulations and experiments. The results show that the performance of the BL-IM under the MPCC strategy based on the fuzzy dynamic objective function is improved compared with the traditional MPCC and the vector control based on the fuzzy PID, due to its better dynamic and suspension performance. Meanwhile, the stability of rotor current component is enhanced.

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Constant stator current control for three-phase induction motor drive with fixed exciting current

2014 9th IEEE Conference on Industrial Electronics and Applications ◽

10.1109/iciea.2014.6931171 ◽

2014 ◽

Author(s):

Tsung-Cheng Chen ◽

Gwo-Jen Chiou ◽

Jeng-Yue Chen ◽

Chien-Chung Su ◽

Ming-Jen Chen

Keyword(s):

Induction Motor ◽

Current Control ◽

Motor Drive ◽

Induction Motor Drive ◽

Stator Current ◽

Exciting Current ◽

Three Phase

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Improvement of Induction Motor Torque Characteristics by Model Predictive Current Controller

International Journal of Recent Technology and Engineering - 2 ◽

10.35940/ijrte.b3579.078219 ◽

2019 ◽

Vol 8 (2) ◽

pp. 5578-5583

Keyword(s):

Induction Motor ◽

Predictive Control ◽

Complex Space ◽

Control Variable ◽

Current Control ◽

Current Harmonics ◽

Stator Current ◽

Current Controller ◽

Vector Modulation ◽

Further Development

This paper describes the Model Predictive control (MPC) strategy to control the Torque of the Induction Motor (IM) according to the reference torque provided. IM fed with an Three Level Neutral Point Clamped (NPC) Inverter. MPC paves the way to replace complex Space Vector Modulation (SVM) into a simple understandable algorithm. It uses the discretized model of the IM. Stator current is used as a control variable hence called Model Predictive Current Control (MPCC). MPCC is derived from Field Oriented Control (FOC) Technique. MPCC achieves improved nominal torque compared to FOC, But current harmonics are high rather it’s simplicity encourages it’s usage and further development in MPC strategies for Embedded Drives. By the end of the paper, both FOC and MPCC controls of IM drive were discussed using MATLAB/SIMULINK.

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Design of DC-DC Boost Converter with Negative Feedback Control for Constant Current Operation

International Journal of Power Electronics and Drive Systems (IJPEDS) ◽

10.11591/ijpeds.v8.i4.pp1575-1584 ◽

2017 ◽

Vol 8 (4) ◽

pp. 1575

Author(s):

L Navinkumar Rao ◽

Sanjay Gairola ◽

Sandhya Lavety ◽

Nurul Islam

Keyword(s):

Feedback Control ◽

Negative Feedback ◽

Duty Cycle ◽

Boost Converter ◽

Current Control ◽

Constant Current ◽

Switching Frequency ◽

Charging Time ◽

Negative Feedback Control ◽

Current Operation

In this paper design of DC-DC boost converter with constant current control, charging is presented to charge the battery of electric vehicles. The different methods of battery charging are discussed. The charging profile of different types of batteries is investigated and compared with respect to charging time. The battery current is sensed and compared with a reference current and the generated actuating signal which is an error is feed to PI controller to compute a duty cycle of boost converter for constant current operation. A 6 V dc supply is obtained by using a step down transformer and diode rectifier. Boost converter parameters are designed for continuos conduction mode operation. The limiting values of duty cycle are fixed in the range of 0.5 to 0.6 for constant current operation. Simulation is carried out using MATLAB software for constant current operation connected to a 50 Ah, 12 V battery load. The constant current operation is achieved using negative feedback control. The switching frequency of boost converter is set to 20 kHz. The filter components are also designed to reduce ripple content within limited values. The simulation result shows the effectiveness of charging control for hardware implementation.

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