A Robust ANN For Rotor Speed Indirect Measurement Of The Induction Machine

2016 ◽  
Author(s):  
Lucilene F. Mouzinho ◽  
João Viana da Fonseca Neto ◽  
Benedito A. Luciano ◽  
Raimundo Carlos S. Freire
Keyword(s):  
Induction Machine ◽  
Indirect Measurement ◽  
Rotor Speed

Operation of an induction motor supplied by voltage containing subharmonics

2017 ◽  
Vol 1 (1) ◽  
pp. 27-34 ◽  
Author(s):  
Tomasz Drabek
Keyword(s):  
Induction Motor ◽  
Power Supply ◽  
Induction Machine ◽  
Induction Machines ◽  
Positive Sequence ◽  
Rotor Speed ◽  
Phase Voltage ◽  
Negative Sequence ◽  
Three Phase

The paper discusses the effects of the presence of subharmonics (i.e. frequencies lower than the basic 50 Hz) in the voltage supplying the induction machine. Subharmonics in a three-phase grid are the result of the oscillations of peak values of the voltages. In induction machines, this results in the subharmonic and interharmonic currents, the generation of alternating moments, the increase in the rms value of the current of the fundamental harmonic and the oscillations of the rotor speed. In the paper is derived expression on the thermally acceptable load of the motor (by torque and power), in the case of supplying it by three-phase voltage containing a positive sequence of subharmonics. It presented the obstacles to derive the analogical expression for power supply containing a negative sequence of subharmonics.

scholarly journals Rotor Speed and Flux Estimation of a Doubly-fed Induction Machine Using Extended Kalman Filter

2017 ◽  
Vol 2 (4) ◽  
pp. 266-273
Author(s):  
Ahmad Boussoufa ◽  
Madjid Kidouche ◽  
Aimad Ahriche
Keyword(s):  
Induction Machine ◽  
Doubly Fed Induction Generator ◽  
Power Network ◽  
Rotor Speed ◽  
Extended Kalman Filtering ◽  
Filtering Method ◽  
Ac Power ◽  
Doubly Fed Induction Machine ◽  
Flux Estimation ◽  
Doubly Fed

This paper uses Extended Kalman Filtering method (EKF) to estimate the rotor speed and flux of a Doubly-fed Induction Generator (DFIG) to be used in Wind Turbines (WTs). DFIGs are widely used in WTs because they can generate an electric power of constant voltage amplitude and frequency which allow a direct connection between the WTs and the ac power network. A DFIG modeling in the (dq) reference frame is presented and a brief description of EKF algorithm is described to estimate the rotor speed and flux. Simulations results are shown and discussed.

scholarly journals A Rotor-Sync Signal-Based Control System of a Doubly-Fed Induction Generator in the Shaft Generation of a Ship

Processes ◽  
2019 ◽  
Vol 7 (4) ◽  
pp. 188 ◽  
Author(s):  
Trong-Thang Nguyen
Keyword(s):  
Control System ◽  
Induction Machine ◽  
Induction Generator ◽  
Doubly Fed Induction Generator ◽  
Rotor Speed ◽  
Grid Voltage ◽  
Induction Generators ◽  
Generator Voltage ◽  
Doubly Fed Induction Machine ◽  
Doubly Fed

A doubly-fed induction machine in generator-mode is popularly used for energy generation, particularly in the case of a variable speed, such as in the wind generator, the shaft generator of a ship, because the doubly-fed induction generator is able to maintain a stable frequency when changing the rotor speed. This paper aims to propose a novel method for controlling the shaft generation system of a ship using a doubly-fed induction generator. This method uses the rotor signals of a small doubly-fed induction machine as base components to create the control signal for the doubly-fed induction generators. The proposed method will be proven by both theory and a simulation model. The advantage of the proposed method is that the control system of the generator can be simply built, but it functions effectively. The generator voltage always coincides with the grid voltage, even when the grid voltage and the rotor speed are changed, and the reactive and active power of the generator fed into the grid can be separately controlled.

Performance Analysis of 5-Phase Multi-level Inverter Using Carrier Based PWM Technique

2016 ◽  
Vol 5 (3) ◽  
pp. 151
Author(s):  
M. Lavanya ◽  
B. Jyothi
Keyword(s):  
Performance Analysis ◽  
Induction Machine ◽  
Drive System ◽  
Voltage Source ◽  
Electromagnetic Torque ◽  
Rotor Speed ◽  
Voltage Source Inverter ◽  
Machine Drive ◽  
Performance Effects ◽  
Multi Level

The major analysis has been based on the induction machine drive system that is for the analysis of the carrier based PWM two level source inverter. The unbalanced conditions are mainly to handle the results of simulation for the analysis that results in the two fault conditions. The system setup has been involving the voltage source inverter as well as the five phase multi-level inverter. The effects are through performing the scenarios which consider the performance effects with the load on induction machine. The simulation is based on the imbalance conditions which results on the oscillations depending on the electromagnetic torque through the attendant reduction of the torque rating. The larger slipping has been in the rotor speed.

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