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This paper proposes a real time scalar control of induction motor by using RT-LAB software. This method of control leads to be able to adjust the speed of the motor by control the frequency and stator voltage magnitude, the ratio of stator voltage magnitude to frequency should be kept constant, which is called as scalar control of induction motor. The real-time scalar control algorithm is designed...
A teaching example is built in Simulink, and then, based on the communication between Matlab and LabVIEW, a teaching virtual platform in LabVIEW is realized. This platform is about a wind power generation system and used mainly for the Renewable Energy Sources course of the undergraduate students of electrical engineering major. Compared with Simulink simulation teaching, the virtual platform adopts...
In order to improve the starting torque of the soft start of the asynchronous motor and reduce the starting current, a soft starting method from the second frequency to the power frequency starting is proposed. On the basis of this theory, the simulation model of soft start system of asynchronous motor graded frequency conversion control is built by Simulink simulation function of MATLAB. The simulation...
Energy efficiency of the process equipment is achieved by the use of modern energy-saving electric drives. One of the ways of development such systems is the use of induction motor electric drive with power factor correction (PFC). The article provides analysis of PFC, built on the boost voltage converter, develop of its control system and also functional model, made in Matlab Simulink.
Against soft starting of 3-phase induction motors with heavy loads which is achieved by means of Discrete Variable Frequency(DVF) and electricity-economizing control system in light load situation, some technical problems are analyzed and studied. Analysizes the optimal combination of phase sequence of DVF bands based on the theory of DVF soft starting. The given voltage of the initial frequency is...
This paper deals with investigation on the performance of voltage and frequency controller (VFC) of a wind power generation using a capacitor excited isolated asynchronous generator (IAG) feeding dynamic loads. The amplitude of load currents is estimated using the low pass filter to control the voltage and frequency of IAG system. Three-leg voltage source converter (VSC) with a battery energy storage...
This paper presents the transient performance of a series-compensated three-phase self-excited induction generator (SEIG) feeding a dynamic load such as a three-phase squirrel-cage induction motor (IM). Mathematical modeling and simulation study of SEIG and an induction motor (SEIG-IM) combination is carried out using MATLAB/Simulink. An exhaustive experimental study is conducted using a Mawdsley's...
For conventional motor soft starter, the starting torque would be seriously decreased when reduce the starting voltage, so it is limited to light load, However, many overloading start-up is required in practical applications. According to the relationship between three-phase asynchronous motor electromagnetic torque and power frequency, when keeping the size of voltage unchanged, the torque can be...
The power quality behaviour of a Remote Area Power System (RAPS) consisting of a Doubly Fed Induction Generator (DFIG), its main loads and a dummy load is presented in this paper. The dummy load is used to maintain the power balance of the system under changing wind and loading conditions. The performance of the remote area power system subject to various loading conditions has been evaluated in terms...
It is not quite uncommon, in general, to use DC motors in industrial applications, but after the introduction of power electronics, AC motors grabbed much importance. Of these, induction motors are widely used in industrial and domestic applications due to the advantages like simple construction, ruggedness, flexible control, good efficiency and low cost. In order to control the stator voltage and...
The main issue of this work is to analyze and to test how the characteristic curve of the induction machine can be adjusted by the power electronic devices, when these are integrated into rotor circuits. In order to technically analyze the characteristic performances of the induction machine by switching between cages, the simulator software's MATLAB and NETASIM have been used. The simulated current-...
This paper deals with a solid state voltage and frequency controller for an isolated wind energy conversion system (WECS) based on capacitor excited asynchronous generator (CEAG) and feeding an induction motor load. The proposed voltage and frequency controller consists of an IGBT (insulated gate bipolar junction transistor) based voltage source converter along-with battery energy storage system (BESS)...
Based on fuzzy control strategy, direct torque control (DTC) system of induction motor is designed by making use of a fuzzy controller to choose voltage-space-vectors. Simulation model of this system is realized via Matlab software. Finally, simulation results show that this system has improved dynamic and static performance that the response of torque gets quicker, and the fluctuation of torque turns...
In this paper, we will introduce a new strategy of modeling and control of photovoltaic pumping systems under MATLAB/SIMULINK environment. This approach is based on the dynamic model of the "PV-MPPT adapter-inverter-asynchronous motor-pump". The MPPT control allows the extraction of the maximum output power delivered by the PV generator. However the inverter insures a PWM control of the...
The modern technique of direct torque control induction motor is modified in this paper. Machine analysis is emphasized directly on the 3-phase variables for motoring mode, so Park's transformation to generalized d-q axis theory is not used. Only stator current signal is functioning to evaluate fluxes and speed, so that no need to use any sensor. The 3-phase PPU inverter gate is excited by the control...
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