power_pwm matlab simulink 电子电器仿真模型 源文件.zip

%% Three-Phase Asynchronous Machine % % This example shows the asynchronous machine % in an open-loop speed control on a 3 HP 220 V industrial motor. % % Louis-A. Dessaint and R. Champagne (Ecole de Technologie Superieure, % Montreal) % Copyright 1997-2013 Hydro-Quebec, and The MathWorks, Inc. %% open_system('power_pwm') %% Description % % A three-phase motor rated 3 HP, 220 V, 1725 rpm is fed by a sinusoidal PWM inverter. The base frequency % of the sinusoidal reference wave is 60 Hz while the triangular carrier wave's frequency is set to 1980 Hz. % The PWM inverter is built entirely with standard Simulink(R) blocks. Its output goes through Controlled Voltage % Source blocks before being applied to the Asynchronous Machine block's stator windings. The machine's % rotor is short-circuited. Its stator leakage inductance Lls is set to twice its actual value to simulate the % effect of a smoothing reactor placed between the inverter and the machine. The load torque applied to the % machine's shaft is constant and set to its nominal value of 11.9 N.m. % % The motor is started from stall. The speed setpoint is set to 1.0 pu, or 1725 rpm. This speed is reached % after 0.9 s. % %% Simulation % % Take a look at the simulation parameters. The Maximum time step has been limited to 10 microseconds. % This is required due to the relatively high switching frequency (1980 Hz) of the inverter. % % Observe that the rotor and stator currents are quite noisy despite the use of a smoothing reactor. The noise % introduced by the PWM inverter is also observed in the electromagnetic torque waveform Te. However, the % motor's inertia prevents this noise from appearing in the motor's speed waveform. % % The RMS value of the fundamental component of the line voltage at the machine's stator terminals is measured % with a Fourier block. % % Finally, observe the PWM inverter's output. Use the zoom on the vab oscilloscope to zoom in on the waveform. % %% clear all close all bdclose all