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Open-end winding induction motor can be powered by double inverters at both ends. Comparing with conventional single-ended inverter induction motor drive, this new configuration produces some advantages, such as high error tolerance capability, high flexibility, and low DC voltage rating, and so on. Under single DC power supply however, the zero-sequence currents may be produced by the common mode...
The contribution deals with steady state estimation of an electromagnetic torque ripples and a current waveform of a two-phase induction motor (IM) supplied by an three-leg IGBT bridge connected voltage source inverter (VSI). The inverter's output voltage is controlled by a modified sinusoidal SPWM of the input DC voltage. The complex Fourier series analysis of the inverter's output voltage was made,...
In this paper, aimed at the neutral-point potential unbalance of the three-level neutral point clamped inverter, an improved new control scheme about neutral-point potential balance was proposed and a simplified direct torque prediction scheme was used for induction motor fed by three-level inverter. Firstly, stator voltage vectors to be applied at the next time was preselected by the torque prediction...
Dual three-phase (asymmetrical six-phase) induction motors have received significant attention in high power medium voltage drive applications. Typically, two three-phase voltage source converters are needed to feed such a drive system. In medium voltage applications, multilevel inverters are preferred as they provide a stepped output voltage waveform that reduces dv/dt stresses and provides a better...
A system is described whereby floating capacitor H-bridge converters are located in each phase between the utility grid and a squirrel cage induction motor. Injecting a series voltage in each phase, the power electronics can be used to control the motor voltage during starting and hence limit the motor starting current to the desired level. The motor voltage can also be used under steady-state operation...
This paper presents a control technique for smoothing voltage oscillations in the sub-modules of Modular Multilevel Converter during start-up operations of high-power medium-voltage induction motor drive. At steady-state, the power fluctuations in each sub-module at fundamental and 2nd harmonic frequencies generate capacitor voltage oscillations which are much higher as the current frequency decreases...
This paper presents a comparative study of the most significant control methods (scalar control (V/F), indirect field oriented control (IFOC) and direct torque control (DTC)) for an induction motor fed by a Z-source inverter (ZSI) for automotive applications. The three control techniques are implemented using PWM voltage modulation. The comparison is based on various criteria including: the motor...
This paper investigates the vector control of a two-phase induction motor drives with using matrix converter topologies. The aim is to reach a set of switches that can produce two phases voltage and current in order to be used in an induction motor. Since it is important to have a desired frequency for motor operation then this task can be achieved using matrix converter. Solution presents a switching...
The present work tries to investigate and exploit the maximum energy delivered by a solar photovoltaic, to power a double star induction motor (DSIM) through two voltages inverters of five levels NPC structure. The proposed cascade consists of two photovoltaic's sources-two inverters voltages of five-level NPC structure-DSIM. This study shows the volatility of the input voltages of the two inverters...
Matrix (MC) and indirect matrix (IMC) converters are direct three-phase to three-phase power converters providing variable frequency and amplitude control of their output voltage. These converters are compact solutions which can be used on industrial adjustable speed drive applications for induction motors. This paper deals with the comparison of the matrix and indirect matrix converter silicon losses...
Higher dv/dt and neutral point voltage floating often occur at the common three-level inverter, therefore, the modified modulate strategy is first studied for an induction motor system (IM) fed by a three-level inverter to implement direct torque control (DTC), and then the SIMULINK model is set up for the direct torque controlled induction motor system fed by the modified three-level inverter's modulate...
This article presents speed controlling for single phase induction motor. Principally, 9-level, diode-clamp inverter used to control voltages per frequency is widely used because of its high efficiency to control the motor. In this article, ARM7 model ADU7024 is used as microcontroller to generate eight pulse signals and send to the output voltage amplifier by co-connecting to the modulation module...
The linear induction motor (LIM) drives using conventional direct thrust control (DTC) schemes have drawbacks of large thrust ripples in low speed range and so on. In this paper, the thrust ripples of the DTC-based LEVI drives are theoretically analyzed. A novel switching scheme using synthesized voltage vector and magnitude modulation method is proposed to replace the conventional switching table...
Nowadays, with the demand of high speed traction applications, for example traditional locomotive or Electric Multiple Units, medium-voltage high power AC drives are required. In the high power AC drives, the switch frequency of the devices has to be limited in order to reduce the loss of the power semiconductor devices. The modulation strategy is made up of asynchronous modulation, synchronous modulation...
This paper deals with energy optimal control of induction motor dives. When motor operate at given steady-state operation point, the optimum control efficiency is acquired by seeking the different voltage-frequency ratio so that the active power absorbed by the motor is minimization, that is improve operational efficiency and achieve the purpose of energy saving. But the minimum active power also...
Matrix converter is a direct AC-AC converter, has received considerable interest as a viable alternative to the conventional back-to-back PWM converter. In this paper, the direct space vector modulation (DSVM) technique is applied to the matrix converter. This technique is considered the best as it achieves the highest voltage transfer ratio (0.866). The performance of 3Phi to 3Phi matrix converter...
This paper establishes the mathematical model of direct torque control (DTC) system of induction motor. Then a realization scheme of fully digitized direct torque control system is introduced with the DSP TMS320F2812 that works as the core control chip and IPM that works as main circuit. The control scheme obtains the switch control signal of inverter with the space voltage vector modulation technology...
Cascaded neutral point clamped (NPC) inverter is more suitable for high voltage, high power applications, but the power and voltage balances are crucial in practical uses. This paper proposes an effective SPWM control scheme for a cascaded NPC inverter in which a pulse rotation is fulfilled for all modulation indices. The module voltage and power, and series- capacitor voltage of each module are perfectly...
This paper presents results of application of a new method of synchronized pulsewidth modulation (PWM) for control of symmetrical six-phase traction drives with two DC sources. The six-phase (dual three-phase) drive system includes in this case a symmetrical induction motor which has two sets of windings spatially shifted by 60 electrical degrees. Analysis of operation of the symmetrical six-phase...
A new space vector modulation (SVM) technique having a full and independent control of the multiple voltage space vectors of a six-phase voltage source inverter is presented in this paper. The proposed space vector approach is based on three-phase decomposition, leading to the modulation of two three-phase VSIs. The six-phase load consists in a dual three-phase induction motor, with insulated neutral...
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