1、英文原文 Simulink Demos Simulink is a tool for modeling, analyzing, and simulating physical and mathematical systems, including those with nonlinear elements and those that make use of continuous and discrete time. As an extension of MATLAB, Simulink adds many features specific to dynamic systems while
2、retaining all of general purpose functionality of MATLAB. Run demos in the following categories to see Simulink in action. Category Description Features Simulink provides many features for powerful and intuitive modeling. Some major features are illustrated in these demonstration models. General Sim
3、ulink has the ability to simulate a large range of systems, from very simple to extraordinarily complex. The models and demonstrations that you will see in this section include both simple and complex systems. Although the complex systems are nowhere near the limits of what can be done, they hint at
4、 the level of sophistication that you can expect. Automotive imulink, Stateflow and the Real-Time Workshop represent the industry standard toolset in the automotive field. The models that you will see in this area showcase the use of MathWorks tools in various automotive applications. Aerospace Simu
5、link, Stateflow and the Real-Time Workshop represent the industry standard toolset in the aerospace field. The models that you will see in this area showcase the use of MathWorks tools in various aerospace applications. Other Simulink Products Run demos for other Simulink products you have installed
6、. Try these demos to see which Simulink products might be appropriate for the work you do. Note that this is a comprehensive list of Simulink products. Your particular installation of MathWorks products will likely include only some of these products. Product Description Embedded Target for Motorola
7、 MPC555 Deploy production code onto the Motorola MPC555 Real-Time Windows Target Run Simulink and Stateflow models on a PC in real time Real-Time Workshop Generate C code from Simulink models SimMechanics Model and simulate mechanical systems SimPowerSystems Model and simulate electrical power syste
8、ms Simulink Report Generator Automatically generate documentation for Simulink and Stateflow models Stateflow Design and simulate event-driven system xPC Target Perform real-time rapid prototyping using PC hardware See Also In the Contents pane, for each Simulink product, see documentation Examples
9、to view more sample code you can run or copy. Three-phase Three-level PWM Converter (discrete) This demonstration illustrates simulation of a 3-phase, 3-level inverterand Discrete 3-phase PWM Generator. It also demonstrates harmonic analysis of PWM waveforms using the Powergui/FFT tool. Circuit Desc
10、ription The system consists of two three-phase three-level PWM voltage source converters connected in twin configuration。 The inverter feeds an AC load (1kW, 500 var 60Hz 208 Vrms) through a three-phase transformer. Harmonic filtering is performed by the transformer leakage inductance (8%) and load
11、capacitance (500 var).Each of the two inverters uses the Three-Level Bridge block where the specified power electronic devices are IGBT/Diode pairs.Each arm consists of 4 IGBTs, 4 antiparallel diodes, and 2 neutral clamping diodes.The inverter is controlled in open loop. Pulses are generated by the
12、Discrete 3-Phase Discrete PWM Generator block. This block is available in theExtras/Discrete Control Blocks library. This PWM generator or modulator can be used to generate pulses for 3-phase, 2-level, or 3-level converters usingone bridge or two bridges (twin configuration). In this demo, the PWM m
13、odulator generates two sets of 12 pulses (1 set per inverter) at P1 and P2 outputs. Open the Discrete 3-phase PWM Generator menu. Notice that the generator can operate either in synchronized or un-synchronized mode. When operating in synchronized mode, the carrier triangular signal is synchronized o
14、n a PLL reference angle connected to input wt.In synchronized mode, the carrier chopping frequency is specified by the switching ratio as a multiple of the output frequency.Three sinusoidal 0.85 pu modulating signals are provided by the Discrete 3-phase Programmable Source to obtain a modulation ind
15、ex of 0.85.The carrier signals are synchronized on the modulating signals. in the PWM Generator block, you can instead select Un-synchronized and Internal generation of modulating signals. In such a case the magnitude (modulation index), frequency and phase angle of the output signals are specified.
16、 directly inside the PWM Generator block menu.For this example the DC bus voltage is 400V (+/- 200 V) , chopping frequency is 1080 Hz (18*60 Hz), magnitude of the three modulating signals is 0.85(corresponding to a modulation index m = 0.85) and the frequency of the three generated signals is 60 Hz.
17、In order to allow further signal processing, signals displayed on the Scope block (sampled at simulation sampling rate of 3240 samples/ cycle)are stored in a variable named psb3phPWM3level_str (structures with time) . Demonstration Run the simulation and observe the following three waveforms on the
18、Scope block: Phase-neutral voltage Van_inv1 generated by inverter 1 (trace 1), phase A voltage Vaa_inverter generated by the twin inverter (trace 2) andphase-phase load voltage Vab_load (trace 3). The Van_inv1 waveform cleary demonstrates the three levels: +200 V, 0 V, and -200 V.Once the simulation
19、 is completed, open the Powergui and select FFT Analysis to display the 0 - 5000 Hz frequency spectrum of signals saved in the psb3phPWM3level_str structure. The FFT will be performed on a 2-cycle window starting at t = 0.1 - 2/60 (last 2 cycles of recording). Selelect the input labeled Vaa _inverte
20、r. Click on Display and observe the frequency spectrum of last 2 cycles.The fundamental component of Vaa_inverter and THD for the 0 - 5000 Hz frequency range are displayed above the spectrum window.Because of the forward voltage drops in the IGBTs (Vf=1 V) and diodes (Vfd=1V), the magnitude of the f
21、undamental voltage of the inverter (335 V)is slightly lower than the theoretical value (340 V for m=0.85). As expected for a twin inverter, first harmonics occur around multiples of doubleof carrier frequency (n*2*1080 Hz +- k*60Hz). The same circuit using two-level inverters in twin configuration i
22、s available in the psb3phPWM.mdl demonstration file.Run this demo and compare the harmonic contents in the 2-level and 3-level inverter voltage for the same modulation index (m = 0.85).Harmonics occur at the same frequencies but their magnitude is approximately two times lower for a 3-level inverter
23、. DC/DC and DC/AC PWM Converters (discrete) This demonstration illustrates use of the UniversalBridge andDiscrete PWM Pulse Generator blocks. It also demonstrates harmonic analysis of PWM waveforms using the Powergui/FFT tool. Circuit Description The system consists of three independant circuits illustrating various PWM DC/DC and DC/AC inverters.All converters are controlled in open loop with the Discrete PWM Generator block available in the Extras/Discrete Control Blocks library.
