TITLEINDUCTION MOTOR TESTS USING MATLAB/SIMULINK

Term Paper PresentationEE – 5133

Dynamics of Power System and Apparatus

Presented by:Girish Gupta

Roll no. 15082023Power System

M. Tech

Vivek KumarRoll no. 15082020Power System

M. Tech

Presented toDr. M K Verma,

Associate Professor,Department of Electrical

Engineering, IIT-BHU

CONTENTS

ObjectivesDC Test of Induction MachineNo Load Test of Induction MachineBlocked Rotor Test of Induction Machine

Conclusion

OBJECTIVEDevelopment of following simulation model of

induction motor test using Matlab/Simulink:- 1. DC Test 2. No Load Test 3. Blocked Rotor Test

To perform the above three tests using Simulink on a given induction motor model and compare the results with the parameters of the given induction motor.

EQUIVALENT CIRCUIT OF INDUCTION MOTOR

• R1 - Stator Resistance• R2 - Rotor Resistance• X1 - Stator leakage reactance• X2 - Rotor leakage reactance• XM - Magnetizing reactance• Rc - Core Loss Resistance• S= slip

1. DC TEST The dc test is performed to compute the stator winding

resistance R1.

A dc voltage is applied to the stator windings of an induction motor.

The resulting current flowing through the stator windings is a dc current; thus, no voltage is induced in the rotor circuit, and the motor reactance is zero.

The stator resistance is the only circuit parameter limiting current flow.

EXPERIMENTAL SET UP OF DC TEST

SIMULINK IMPLEMENTATION OF DC TEST

CALCULATIONS OF DC TEST PARAMETERS

• VDC = Voltmeter Reading• IDC = Ammeter Reading• R1 = Stator Resistance

ACTUAL PARAMETERS OF THE IM TAKEN IN SIMULATION

RESULTS OF THE DC TEST WITH ERRORS

The no-load test on an induction motor is conducted to measure the rotational losses of the motor and to determine some of its equivalent circuit parameters.

In this test, a rated, balanced ac voltage at a rated frequency is applied to the stator while it is running at no load.

During this input power, voltage, and phase currents are measured at the no-load condition.

For the simulation of no load, Mechanical Load torque is set to zero in the simulation

1. NO LOAD TEST

EXPERIMENTAL SET UP OF NO LOAD TEST

SIMULINK IMPLEMENTATION OF NO LOAD TEST

CALCULATIONS OF NO LOAD TEST PARAMETERS

• V = Voltmeter Reading per phase• Iφ = Ammeter Reading per phase• P = Real Power per phase• Qa= Reactive Power per phase• ZNL = No load Impedance

ACTUAL PARAMETERS OF THE IM TAKEN IN SIMULATION

RESULTS OF THE NO LOAD TEST WITH ERRORS

In this test, the rotor of the induction motor is blocked. A reduced voltage is applied to the stator terminals so

that the rated current flows through the stator windings. The input power, voltage and current are measured. The experimental setup of the blocked-rotor test is not

shown here since it is similar to that of the no-load test. In the Simulink model, to get the blocked rotor, the

inertia of the given induction machine is taken very high so as to keep the rotor speed to zero.

3. BLOCKED ROTOR TEST

SIMULINK IMPLEMENTATION OF BLOCKED ROTOR TEST

ACTUAL PARAMETERS OF THE IM TAKEN IN SIMULATION

CALCULATIONS OF BLOCKED ROTOR TEST PARAMETERS

• Va = Voltmeter Reading per phase• Iφ = Ammeter Reading per phase• P = Real Power per phase• Qa= Reactive Power per phase• Zbr = Blocked rotor Impedance = Rbr + Xbr• X1’ - Stator leakage reactance• X2’ - Rotor leakage reactance

RESULTS OF THE BLOCKED ROTOR TEST WITH ERRORS

CONCLUSION In this paper, MATLAB simulation models of induction motor

tests are performed to obtain parameters of the per-phase equivalent circuit of three-phase induction motors.

Each Simulink/PSB model is explained in detail and compared with the corresponding experimental setup.

Circuit parameters obtained from simulation results are compared with those obtained from hardware experiments.

The error studies show that MATLAB paired with Simulink/PSB is a good simulation tool to model induction motor tests and to evaluate steady-state characteristics of the induction motor.

Thank You.