Hardware Implementation Of Impedance Inverter And Controlling Speed Of Three Phase Induction Motor

A phase-locked loop (PLL) generates a signal that has a fixed relation to the phase of a reference signal and is given in Fig. 4. A phase locked loop responds to both the frequency and the phase of the input signals, automatically raising or lowering the frequency of the controlled oscillator until it is matched to the reference in both frequency and phase. Here three phase PLL was implemented with three basic functional blocks: the phase detector, a PI controller and a voltage controlled oscillator. The phase detector is a circuit capable of delivering an output signal that is proportional to the phase difference between its two input signals. The PI controller is a low pass filter and used to suppress high frequency component and provide dc controlled signal to voltage controlled oscillator which acts as an integrator. The output of the PI controller is the inverter output frequency that is integrated to obtain inverter phase angle θ. When the difference between grid phase angle and inverter phase angle is equal, Vq =

The impact of the proposed sequences has been simulated for 0.4 modulation index with a 0.5 lagging power factor load (power factor angle 60°). The simulation setup consists of the following software: 1) MATLAB/Simulink – used to implement the modulation strategies and switching sequences, and 2) PSIM – used to simulate the T-NPC inverter running with an R-L load and to provide conduction and switching losses of each switch. The inverter switching pulses were generated within Simulink and were fed to PSIM through sim-coupler module which provides a link between PSIM and simulink for the purpose of co-simulation [29].

The innovative inverter technology produces safe, smooth power, protecting your sensitive electronics (computers, smartphones, etc.) from damage.

Vector transformation is not applied because stator quantities are enough to calculate the torque and stator flux linkage as feedback quantities to be compared with the reference values.

Abstract: The area of the multiphase motor has experienced a significant growth in last decade numerous interesting development have been reported in the literature in this chain this paper is an attempt to mathematically model both three phase and six-phase induction motor for comparison of their characteristics. Using this mathematical modeling a Simulink model is created whose results shows that the six-phase induction motor can sustain more than four times the torque that can be sustained by three phase induction motor of same design parameters. The six-phase motor is better not just in torque handling capacity but it also has inherent advantages of the multiphase induction motor.

1) are derived first by algebraically solving the equivalent circuit shown in Fig. 2. These extreme values include maximum torque, maximum mechanical power, maximum power factor, maximum efficiency, and maximum electric power. It will be shown that the torque and mechanical power extrema can be expressed in analytical forms while the power factor, efficiency and electric power extrema need to be solved numerically. It will then be shown that these extrema can also be determined graphically using the circle diagram method. The circle diagram method is an old method but can still be found in some textbooks (e.g., [3]-[4]). The research into graphical methods for induction motor analysis is still active (e.g., [5][11]). One may consider that the circle diagram method is limited to qualitative evaluation because it cannot give accurate results. In fact, if the circle diagram method is carried out by a modern computer drawing tool that allows the user to draw geometric diagrams with parameters (i.e., coordinates, lengths, angles, etc.) to the accuracy of four decimal places, then the circle diagram method is able to give all the aforementioned performance extrema with required accuracy. Unlike the circle diagram method used in [10] and [11] that is based on the approximate equivalent circuit of induction machine and is limited to motoring mode of operation, the circle diagram method used in this paper is based on

For this lab the model of the synchronous machine was already considered. The synchronous machine being used had a rating of 208-V (line-to-line rms), 60-Hz, and 200-W. It is a 4-pole machine with a synchronous speed of 1800 RPM. The open-circuit and short-circuit tests performed in this lab can

The objective of the proposed internship can be divided into the following sub-objectives – 1) develop a control strategy with variable operating switching frequency to dynamically control current ripple and reduce system losses, and 2) develop a current control strategy to improve dynamic response for the two level inverter fed PMSM drive; while taking into account the effect of different operating regions and drive design parameters. More specifically the following tasks will be accomplished for each sub-objective:

Induction motor is widely used in many different industries, it is a kind of machine use AC electric power to generate magnetic force and field from the stator winding. The different of induction motor from other kinds of motors is that induction motor need no automatic commutation, separate-excitation or self-excitation from stator to rotor to changing the power. Rotor voltage is induced in the rotor rather than being

There are numerous methods which are as follows like (SPWM) First Sinusoidal Pulse Width Modulation, (MCPWM)Second, Multi-Carrier Pulse Width Modulation and (SHE-PWM) and Selective Harmonic Elimination Pulse Width Modulation which are implemented for harmonic elimination specially in multilevel inverter. (MCPWM)Multi-Carrier Pulse Width Modulation strategies are widely used, because they can be easily implemented to low voltage modules. Normally MCPWM can be classified and categorized as Level Shifted PWM (LS-PWM) and Phase Shifted PWM (PS-PWM) methods. (LS-PWM) Level Shifted PWM are characterized into three which are Firstly ,Phase Disposition Technique (PD), secondly ,Phase Opposition Disposition Technique (POD) thirdly Alternative Phase Opposition Disposition Technique (APOD) [45] [46] [47].

It is appropriate for speed control applications. FLC is very suitable for the controlled object with characteristics of large delay, large inertia, non-linear and time-variant [28].

Feed forward control is a reliable for rejecting fast and dynamic voltage disturbances in the phase grid. Mainly in this scheme implemented in phase voltages of the Wyes connected configuration. Under this unbalanced and distorted grid conditions, the online conversion of line - to - line values into the phase value is unworkable. In order to an exploit full advantages of feed forward controller is a most appropriate modulator is needed. In this article the feed forward of grid line-to-line voltages is used in phase voltages. The introduced feed forward method is implemented in Implicit Zero Sequence Discontinuous Pulse Width Modulation (IZDPWM) technique that is compatible for grid connected inverters. Regarding in the IZDPWM grid topologies distorted the harmonics of the grid voltages. Hence, a sinusoidal current is injected to the grid. Moreover, the measuring grid line-to-line voltages two sensors are required; hence an overall system costs is reduced and control system reliability is increased. The time-domain simulations in MATLAB/Simulink and experimental results from a Hardware based laboratory prototypes are in good agreements,

The project is for limiting the speed of the vehicles running on the road. In day to day life people ride their vehicles at very high speed without caring for the speed limit fixed by the government for the particular road on which they are travelling. This gives rise to huge number of accidents. The whole control system consists of frequency receiver, speed sensing element, microcontroller and some modification in wiring with relay which is described above. On every road, some speed limit is already decided by the government which should be strictly followed by the vehicle’s driver. The limited speeds may be 20 kilometer per hour, 40 kilometer per hour, 60 kilometer per hour, 80 kilometer per hour or any other speed limit. The number of speeds to be limited may be any as per government decision. For every speed limit an unique frequency will be allotted. The frequency transmitters will be placed at certain interval of distance so that the whole road is covered with the frequency being transmitted and the circuit can receive the frequency.

Direct torque control of induction motor simulation using conventional method and space vector pulse width modulation

I hereby declare that this summer training report submitted to the Department of Electrical Engineering, IIT Roorkee is a record of an original work done by me under the guidance of Mr. Chetan Bansiwal And this report is submitted in the light of partial fulfillment of the requirements for the award of the degree of Bachelor of Technology in Electrical Engineering.The results mentioned in this report have not been submitted to any other university or Institute for the award of any degree.