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This paper presents a simple solution to the variable switching frequency and high torque ripple which encountered by hysteresis-based Direct Torque Control (DTC) drive. To solve this two major problems, a new carried-based torque controller is introduced to replace the previous hysteresis torque controller which operate by comparing torque error with the triangular waveform. Since the dual-inverter...
Due to automotive industrial constraints, the number of sensors on the electric powertrain has to be reduced. Thus, the stator phase currents of the wound rotor synchronous machine are not directly available and they have to be estimated. In this paper, different solutions of estimation are proposed. The first one is based on the extended Kalman filter, and the second one is a non-linear estimator...
This paper presents a symmetric winded PMSM which is connected by all in part coil to a supply system at low voltage of 48–100 V DC, developed by Research Center of Vehicle Industry in Szechenyi University. It has several benefits of this winding system its separate supply. The motor construction is slightly different from the general constructions; its running and control are different but on the...
The paper presents a novel robust field oriented vector control for induction generators. The proposed controller exploits the concept of indirect field orientation and guarantees asymptotic DC-link voltage regulations when DC-load is constant or slowly varying. An output-feedback linearizing Lyapunov's based technique is employed for the voltage controller design. Flux subsystem design provides robustness...
This paper presents the design approach of a power train used in an advanced high-lift system for future aircraft. Aircraft applications require an ultra-light and integrated design leading to an electrical machine with a high power to weight ratio of 2.82 kW/kg. To achieve additional high lift during take-off and landing, air is blown out at the back flaps of the aircraft wings using a turbo compressor...
Common mode voltage of the inverter output create a leakage current in the stator. It creates a net magnetic flux link with the shaft and induces an electromotive force (EMF) in between the two ends of the rotor. This EMF generates a current through two bearings and reduces its lifetime. In this study, we propose a frequency selective low impedance path to dissipate the EMF in the shaft. Finally,...
In this paper, a direct toque control (DTC) and space vector modulation (SVM) are combined to control a five-phase permanent magnet synchronous motor drive (PMSM). Based on the mathematical model of five-phase motor, DTC control strategy is developed, and the corresponding controllers are properly designed in order to provide independent torque control. Five-phase SVM is adopted, instead of look-up...
Dc-link voltage fluctuation, originated from the single-phase power supply, has a significant impact on the railway traction drive system. This impact is of importance for stable operation and better performance. Meanwhile, the high-power and limited space of traction inverter requires low-switching frequency modulation techniques. The influence on performance of the traction drive system under these...
This paper investigates two space vector pulse width modulation (SVM) techniques dedicated to the control of an open-loop induction motor (IM) drives fed by a three-switch three-phase inverter (TSTPI), also known as delta- or B3-voltage source inverter (B3-VSI). The B3-VSI performs a DC to three-phase AC conversion by employing only three power switch devices rather than six ones as in the classical...
The direct torque control (DTC) is the preferred control technique of the induction motor in electric traction applications. It has advantages, as it is a sensorless control technique, but also disadvantages. The main disadvantage is related to the switching frequency which is the same with the sampling frequency of the entire control loop. This determines high requirements for the control system...
In this paper, We will be interested to the direct torque control (DTC) of an induction motor associated to the inverter (Inv-IM). This technique presents several advantages compared to other techniques such as vector control and field control. DTC permits to control directly the stator flux and the electromagnetic torque by selecting the appropriate vector voltage to be applied to the induction motor...
The induction machine is the work horse of the industry. It has rugged construction and is suitable for many high power applications. It has also been a key aspect in revolutionizing the locomotive and the automotive industries. For such automotive applications speed control becomes the driving factor. Hence in this we discuss controlling the speed of 3-phase induction motor using constant volt per...
This paper presents a real-time performance evaluation of direct torque control (DTC) and regenerative braking control of improved z-source inverter fed induction motor drives using field programmable gate arrays (FPGA) based real-time digital simulator (RTDS). RTDS was built using Very High Speed Integrated Circuit Hardware Description Language (VHDL), composing it versatile and compact. The proposed...
The uses of induction motor is ever-growing day by day because of its superiority and high efficiency over dc machine. So for wide range of use in the industry, this machine requires an efficient driver circuitry arrangement. Currently conventional Voltage Source Inverter (VSI) or Current Source Inverter (CSI) is dealing as key part in the field of induction motor driver circuit. These converters...
This paper investigates a method to increase the energy economy of motors for an electric vehicle (EV) traction system. The low torque region of an EV motor is frequently used in everyday urban driving. Pulse-width modulation (PWM) carrier harmonic loss accounts for a high percentage of total loss for EV motors in this region. This paper reveals the relationship between fundamental and harmonic iron...
Wind power conversion systems are a widespread renewable energy source and, as such, have been studied intensely over the past two decades. Wind energy conversion system is connected to the electrical grid through a power converter, an LC filter and a step-up transformer. It is necessary to know the efficiency of the whole energy transfer system and to know the efficiencies of each individual part...
The paper deals with a single-switch IGBT open-circuit faults diagnosis of a two-level voltage inverter supplying an induction motor controlled in a direct rotor field oriented system. The proposed transistor failures diagnostic algorithm is based on an analysis of an estimated rotor flux as well as a measured stator current space vector in a stationary reference frame. The analyzed solution ensures...
A new field oriented control structure is presented which makes it possible to use synchronous optimal PWM (SOPWM) for high-speed PMSM drives. Due to the simplicity of modulator and control, parametrization is straightforward. The algorithms are implemented on an industrial drive controller. Measurement results show the advantages compared to standard PWM schemes using asynchronous space vector modulation...
Inverter driven motor systems have seen wider use in industry as energy reduction methods. Studies have been undertaken previously to understand the effects of voltage imbalances on motor efficiency and deratings. However, this has not been covered in much detail on inverter-driven motor systems. This paper aims to study the effect that motor stator resistance imbalances have on motor efficiency when...
This paper describes the new energy saving method for AC motor drive control that is based on self-commutated current inverter with a relay regulator of stator current. Designed inverter is based on IGBT-transistors and contains additional cutting diodes and buffer capacitor blocks. The experimental model of control system and its power circuit are built. Simulation results and oscilloscope curves...
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