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The parallel three-phase voltage source inverters have been widely used to raise system power rating. However, the zero-sequence circulating current can be generated according to switching method in the direct connection scheme. Zero-sequence circulating current not only distorts current but also reduces system reliability and efficiency. In this paper, model predictive control scheme is proposed...
This study investigates the effect of different skewing methods and angles for switched reluctance machines (SRM) having high pole count using multiphysics simulations. A 24/16 SRM is modeled for each skewing method and different skewing angles using 3D electromagnetic finite element analysis (FEA). Mechanical and acoustical analyses are performed to evaluate the effectiveness of different skewing...
The cost function of finite control set model predictive torque and flux control uses a weighting factor to determine the trade-off between the torque and flux magnitude tracking errors. The choice of this weighting factor strongly influences the current distortions. It will be shown that the optimal weight, which minimizes the current distortions, can be computed algebraically. Furthermore, using...
A rotating electric machine built entirely of sustainable lightweight materials is presented for rotary actuator applications. The machine uses electrostatic forces instead of magnetic, enabling different materials. Here, aluminum, plastic, and printed circuit boards are used as they are low cost and easily recycled at end of life. The electrostatic machine developed is of the axial flux variety,...
The direct torque control (DTC) suffers from high torque and flux ripples due to the use of hysteresis comparators. In this paper, an alternative method is presented for induction motor drive known by the model Predictive Torque Control (PTC). This technique includes the inverter model in control design and does not use any modulation block. The optimal selection of inverter switching states minimizes...
High performance drives with induction machines require use of vector control. The direct torque control and field oriented control are nowadays two most applied vector control methods. The main advantage of the method for direct torque control of induction machines is its simplicity and therefore its robustness. Namely, control variables (the electromagnetic torque and stator flux vector) are estimated...
To improve the accuracy of stator flux estimator in Direct Torque Control (DTC) of Interior Permanent-Magnet Synchronous Machine (IPMSM), a pulse response based rotor position estimator is proposed. The current ripples caused by active voltage vectors in DTC are utilized by the rotor position estimator. Then, the estimated rotor position serves as an input for a model-based stator flux estimator in...
A novel extended state observer (ESO)-based vector control (VC) strategy is developed for permanent magnet synchronous motor (PMSM) drive systems with only one phase current sensor. Generally, to achieve high precision control, two phase current sensors are indispensable for successful operation of the feedback control. In response to a phase current sensor fault, by use of technique of ESO, a new...
In order to suppress unreasonable torque ripple of direct torque control (DTC) in surface permanent magnet synchronous motor (SPMSM), the SPMSM-DTC mode is established and the effect of voltage vectors selected by switching table on torque is analyzed. The conclusion of the change in torque is contrary to expectation when the changes of stator flux and torque angle (angle between stator and rotor...
The aim of this research work is to evaluate and compare the performances of the Direct Torque Control (DTC) and Predictive Torque Control (PTC) algorithms both applied to a three phase induction motor drive fed by three level reduced switch VSI. The comparison has been made based on the torque and current ripples, settling time, and response times during speed and load disturbances and Total Harmonic...
This paper proposes an algorithm for predictive torque control (PTC) of an induction motor drive that is simple to implement and also minimizes switching loss by efficient zero voltage vector placement. An algorithm for selecting the nearest zero vector is presented which can minimize switching losses. The proposed algorithm is analyzed in terms of torque ripple, current THD, dynamic performance for...
In this paper, we present a double direct control of the torque of the doubly fed induction motor (DFIM). First, the modeling of the motor is carried out in order to apply the technique of dual direct control of the torque (DTC). Thereafter, an explanation of the said control is spread out as well as the principle of adjusting the flux and the electromagnetic torque according to the desired speed...
The Series Dynamic Braking Resistor (SDBR) helps in the post fault recovery of the wind generator. This paper investigates the best location of the SDBR in the Doubly Fed Induction Generator (DFIG) architecture, considering the best switching signal of the SDBR. The SDBR was connected at the stator, rotor and grid side converter of the DFIG wind generator. The DC-link voltage, rotor current and grid...
Doubly fed induction generator (DFIG) is the most implemented electric machine in wind energy conversion systems (WECS) due to reduced size converter, active and reactive power control and economic factors. However, the power electronic stage needs an accurate controller that allows to follow the stator power regulation. As a result, Sliding-Mode Control (SMC) has been successfully implemented in...
The switched reluctance type integrated starter generator (SRISG) has the potential to be applied in hybrid electric vehicles for its robust structure, and it does not feature a magnet. In this paper, a new double-gap SRISG design that can provide higher power is presented. Characteristics, such as torque ripple, charging ability, and efficiency, are investigated by both 2D and 3D finite element analysis...
In spite of many exclusive advantages of the switched reluctance motor (SRM), acoustic noise of this motor is high and it is necessary to do more research on the noise reduction which is the main objective of the present paper. The noise reduction procedure proposed here is included three separate parts: (1) stator design parameters optimization, (2) rotor pole design shape optimization and (3) inserting...
This paper proposes a finite control set-model predictive control (FCS-MPC) system for low-voltage ride through (LVRT) capability enhancement of doubly-fed induction generators (DFIGs) in variable-speed wind turbine systems (WTSs). The proposed FCS-MPC system takes the discrete states of the converter into account and the future converter performance is predicted for each sampling period. Then the...
Conventional finite-set model-based predictive control (FS-MBPC) methods inherently present a variable switching frequency which causes harmonic distortion as well as excessive voltage and current ripple. An indirect power control strategy with fixed frequency capability is presented in this paper for a DFIG driven by an indirect matrix converter. The system initial conditions are maintained for the...
Model predictive torque control (PTC) is simple and effective control method for induction motor drives. The conventional PTC uses all seven vectors, six active and one zero vector, to calculate cost function and improve torque dynamics. But this increases the computational burden on the microprocessor. Also use of zero voltage vector (VV) causes increase in common mode voltage (CMV). In this paper...
This paper deals with the driver design for Brushless DC Motor (BLDCM) by quasi-sinusoidal voltage source inverter with voltage space vector pulse width modulation (VSVPWM) technology. Traditionally, BLDCM is driven by six-step inverter with digital Hall sensor feedback, and has the property of trapezoidal back EMF. However, this paper presents an approach to generate a quasi-sinusoidal voltage source...
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