MATLAB/Simulink three-phase asynchronous motor directly starts the simulation.
Small trees can’t just go straight without repairing, and people can’t learn it! After a long period of time, the primary school students finally returned to normal learning and recording life. Some time ago, CADe_SIMu V1.0 was used to simulate some common and commonly used motor control circuits, but CADe_SIMu V1.0 software can only simulate the control effect of the circuit, but cannot reflect the relevant parameters of the components, the voltage and current in the circuit. The process of change and so on. Therefore, this elementary school student took advantage of this week and didn’t babble, but learned how to use the very useful electrical simulation tool Simulink in MATLAB to simulate the most basic motor start-up link. This article is hereby summarized as a commemorative and hoped for guidance !
Direct start of a
three-phase motor Direct start of a three-phase motor, also called full voltage start, is the easiest way to start a three-phase motor. When starting, the motor is directly connected to the power grid through the contactor, the equipment is simple, the starting speed is fast and the starting torque is large. Direct starting is suitable for small-capacity motors with light loads. For large-capacity motors, this starting method has very significant shortcomings, and the starting current is large, up to 4-7 times the rated current. The power grid causes adverse effects. Therefore, when the rated power P is less than 7.5kW, direct start can be used. The motor control circuit simulated by the previous CADe_SIMu V1.0 software is basically a direct start method.
Simulink three-phase asynchronous motor directly starts the simulation program.
The pupil’s computer is a windows7 32-bit system, and the installed MATLAB version is 2014a version. This version of simulink is very different from many old versions of simulink. Many useful simulation modules are not available. It is here, and the usage of some modules is different. The students of our school will take the Simulink three-phase asynchronous motor directly to start the simulation program as an example, and summarize the operation methods of creating a simulation model and modifying data parameters as follows for your reference.
(1) Create a Simulink simulation file, click "SIMULINK" in the "New" drop-down menu, and then click the first option "Simulink Model" under it. The operation is shown in Figure 1, and the new program interface is shown in Figure 2.
Fig. 1 Simulink program creation operation
Fig. 1 Simulink program creation operation
Fig. 2 Simulink program creation interface
Fig. 2 Simulink program creation interface
(2) Selection and placement of components: There are many models for selection of three-phase power components, online Many old versions of simulink simulations directly used 3 AC Voltage Source modules to construct a three-phase power supply. This elementary school student also tried this solution, but there are two results searched by the AC Voltage Source module. Choose as shown in Figure 3. The components marked in the red box on the right side of the display can be connected to the motor normally. This elementary school student also tried successfully in the process of writing this article. The next article will reflect the specific simulation design.
Figure 3 AC Voltage module selection
Figure 3 AC Voltage module selection In
this article, primary school students choose the Three-Phase Programmable Voltage Source module as the simulation signal source. First click on the icon in the toolbar as shown in Figure 3 to open Simulink Library Browser, and then Enter the keyword Three-Phase in the search bar, click the telescope icon on the right side of the search bar, the search result and the location of the Three-Phase Programmable Voltage Source module are shown in Figure 4.
Figure 4 Three-phase power module
Figure 4 Three-
phase power module The parameter configuration of the three-phase power module is shown in Figure 5, where Amplitude (Vrms Ph-Ph) represents the amplitude, while Vrms represents the meaning of the effective value, and Phase represents the phase angle. Freq represents frequency
Figure 5 Three-phase power supply parameter configuration
Figure 5 Three-phase power supply parameter configuration
(3) Three-phase motor selection: enter the keyword Machine in the search bar, click the telescope icon on the right side of the search bar, the search result is shown in Figure 6, and click to select Asynchronous Machine as shown in the red box in the
figure. Figure 6 Three-phase asynchronous Motor module
Figure 6 Three-phase asynchronous motor module
Double-click and drag the three-phase motor module on the panel, open to set the motor parameters, set Mechanical input to Torque TM (torque), Rotor Type to Squirrel-cage (squirrel cage) as shown in the figure 7 shown. The specific electrical parameter settings of the motor are shown in Figure 8. The Nominal power in the first row represents the rated power of the motor, the other two are the power supply amplitude and frequency, and the second row is the stator of the motor. The resistance and inductance believe many studies Friends who have knowledge of electronics can guess by the unit of the parameter, which is the parameter setting of resistance and inductance. Rotor on the third line is the parameter setting of the motor rotor. The motor parameters I set are shown in Figure 8.
Fig. 7 Motor parameter setting 1
Fig. 7 Motor parameter setting (1)
Fig. 8 Motor parameter setting 2
Fig. 8 Motor parameter setting (2)
Since I set the torque value when setting the motor mechanical input, it needs to be as shown in Fig. 9 For the Constant (continuous quantity) module shown, its parameter settings are shown in Figure 10. Note that the option checkmarked in the red box in Figure 10 must be removed, otherwise the output will be a vector, not a constant.
Figure 9 Continuous quantity module
Figure 9 Continuous quantity module
Figure 10 Continuous quantity parameter configuration
Figure 10 Continuous quantity parameter configuration
(4) The connection operation is basically similar to other simulation software such as CADeV1.0. After selecting the starting position of the connection, hold down the left button and drag it to the connection terminal and release the button. It should be noted that when the connection display is red, it means the connection has failed, and it must start from the beginning to the end. It cannot be connected step by step. As shown in Figure 11, it is a failure. Figure 12 shows the effect of a successful connection. .
Figure 11 Wiring failure situation
Figure 11 Wiring failure situation
Figure 12 Wiring success situation
Figure 12 Wiring success situation
(5) Detection module: There is no Machines Measurement Demux module in simulink of MATLAB2014 software version. Therefore, in order to detect some operating parameters of the motor, this elementary school student chooses the Bus Selector module to separate the parameters of the motor, and select the Bus Selector module as shown in Figure 13. Double-click the module and select the measured motor parameters as shown in Figure 14. Here, the four groups of detection values for the rotor, stator current, motor speed, and torque are shown in Figure 15.
Figure 13 Bus module selection
Figure 13 Bus module selection
Figure 14 Bus parameter selection
Figure 14 Bus parameter selection
Figure 15 Detected variable selection
Figure 15 Detected variable selection After
configuring the parameters, the Bus Selector will have 2 more branches as shown in Figure 16
Figure 16 The configured bus module
Figure 16 The configured bus module
(6) Finally, configure the oscilloscope module, search the keyword Scope, as shown in Figure 17 for the selection operation process. Double-click the Scope module to adjust some parameters of the oscilloscope. As shown in Figure 18, click the gear icon to enter the parameter configuration interface General, and configure the Number of axes to be the same as the number of measured parameters, set to 4. TIME range is the maximum value of the abscissa. I set it to 1 here. Tick labels represent the coordinate label. In fact, it is to choose whether each waveform graph displays the abscissa value. I choose all here, as shown in Figure 19. The second interface History can choose whether to store the measurement data, and the third interface Style can set the color of the waveform. Here, set the background to the white line to black, as shown in Figure 20.
Figure 17 Oscilloscope module
Figure 17 Oscilloscope module
Figure 18 Oscilloscope parameter setting 1
Figure 18 Oscilloscope parameter setting (1)
Figure 19 Oscilloscope parameter setting 2
Figure 19 Oscilloscope parameter setting (2)
The oscilloscope effect after debugging the parameters is shown in
Figure 20 Figure 20 Oscilloscope Debugging effect
Figure 20 oscilloscope debugging effect
(7) Configure POWERGUI module. POWERGUI is a power system simulation module. If you are studying electrical engineering and other electrical majors, you can use it. It can perform grid stability analysis, Fourier decomposition, and power flow. Calculation, impedance frequency response, etc. The selection operation is shown in Figure 21. Although it is not useful, the simulation will fail without this module. For unknown reasons, friends or great gods who understand the reasons can enlighten me in the comments, thank you!
Figure 21 POWERGUI module
Figure 21 POWERGUI module
(8) Finally connect each module as shown in
Figure 22 Figure 22 Complete simulation program
Figure 22 Complete simulation program
Save the simulation file and display the simulation results
(1) Save operation: it must be saved, otherwise it will be done in vain. First click on the File drop-down menu and select Save, or CTRL+S as shown in Figure 23. The save as interface pops up as shown in Figure 24 and select the save path. The save file name must be an English name, otherwise the save is not successful, as shown in Figure 25.
Figure 27 Save operation
Figure 27 Save operation
Figure 28 Save correct settings
Figure 28 Save correct settings
Figure 28 Save error reminder
Figure 28 Save error reminder
(2) The simulation operation is shown in Figure 29 and click the start button in the red box in the figure. Start the simulation, the simulation speed of this program is very fast. After the simulation is completed, double-click the Scope module to display the parameter waveform we expect. At the beginning, the current will change sharply for a short time, and it will almost remain unchanged after it is stable. The stable speed after it is stable is 1500r/min, as shown in Figure 30. The four sets of data corresponding to the simulated measurement waveforms.
Figure 29 Simulation operation
Figure 29 Simulation operation
Figure 30 Simulation data waveform
Figure 30 Simulation data waveform
Note: complete code or writing add QQ2449341593 past review
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