Simulation technology is based on similarity principle, system technology and information technology.

And related technologies in the field of simulation application, based on computer system.

Or the application of related physical effect equipment and simulators, using

Model is a multi-disciplinary comprehensive technology to study the system.

Surgery [1]. At present, with the rapid development of simulation technology, its application has been

Infiltrate into all fields of engineering technology. Electrical engineering and automation

Professional teaching involves electrical engineering, automatic control theory and electric traction.

Power, microcomputer technology and power electronics technology have a wide range of subjects.

Content, not only requires students to master the basic theory of electrical engineering, but also

To master the methods of studying problems in electrical engineering specialty, we should

Strong hands-on ability. Therefore, in the limited classroom at present.

During the teaching and experiment time, some simulation software and computers are used.

Technology, so that students can master the basic theory and control of the specialty more systematically.

The ideas and methods of system design are specialized in cultivating students' scientific research ability.

A subject worthy of study and discussion in vocational education.

This paper introduces the foundation of MA TLAB simulation software.

In fact, this paper takes the teaching link of graduation design major as an example and makes a detailed discussion.

MA TLAB？ The Application of Similin K Software in the Teaching of Electrical Specialty

The application of this simulation tool shows that students can be improved by using this simulation tool.

Understanding ability, practical ability and scientific research ability of professional basic theory.

Introduction of 1 MATLAB simulation software

MA TLAB simulation software has been continuously improved since the launch of 1984.

In recent years, it has attracted more and more attention. 1993, horses were introduced one after another.

LAB4 1X and mattlab51x are based on W INDOW S system.

MA TLAB6 12 version has been reached.

MA TLAB software not only has powerful numerical calculation function, but also has

Have powerful simulation and analysis functions, such as in K and

Simulation. S IMUL in k is an addition under MA TLAB software.

Components are used to provide system-level modeling and dynamic simulation.

Tool platform, providing a wealth of simulation modules, such as electrical.

Power system modules are widely used in engineering majors, including

Simulation models of various motors, power electronic device models and various

Model of measuring device, etc. Generally speaking, the role of S IMUL in K is as follows

System modeling and system simulation can be easily used.

The mouse establishes the required control system model in the model window, and then

Using the function it provides, the system is simulated and analyzed, which makes a

The input, output and control of complex systems become very simple.

And intuitive. Use MA TLAB? K simulation and simulation in analytical control

The main steps of the control system are: (1) Establish the block diagram model of the control system.

And determine analog input and output; (2) setting simulation parameters; (3) Continue

Dynamically simulate and watch the output results; (4) Display the output result.

Analysis and comparison.

2 MATLAB？ UL ink software in business intelligence.

Application of Industrial Design Specialty in Teaching Links

Using MA TLAB's powerful numerical simulation and data processing capabilities

Force, but for electrical engineering and automation professional "automatic control of the original

Science, power electronics technology, motor and drive foundation, power system

"Unified Steady State Analysis", "Digital Signal Processing" and other course content imitation.

Admittedly, research, however, there are many teaching application documents in this regard [2, 3], and

And most of them stay in how to treat MA TLAB. Simulation in k software

The problem of operation and use is actually for most software operations themselves.

And use can refer to its detailed help description. This paper mainly focuses on two aspects.

Students' graduation design content and simulation results, for example, from professional teaching.

This paper discusses the application of simulation software in electrotechnics teaching from the perspective of link.

Use, so as to cultivate undergraduates to apply their learned expertise to improve engineering problems.

Ability to model and analyze topics.

Simulation of SPWM AC speed regulation system based on MATLAB.

Real research

Combining "power electronics technology", "motor and drag foundation" and "near"

On behalf of courses such as AC speed regulation, students take "Basic"

Simulation study on SPWM AC speed regulation system of MIT

The graduation project is studied. Ask students to be familiar with communication-be straightforward

-Based on the AC voltage SPWM, use MA TLAB?

Modeling with S IMUL in K simulation software; Familiar with induced electricity

Based on the principle of motor variable frequency speed regulation, a speed closed-loop controller is designed.

Design, so as to study and analyze the speed closed-loop constant voltage frequency ratio.

Frequency conversion speed regulation process of SPWM control: deepening the control of SPWM

Finally, the harmonic content of stator current is divided.

Spectral analysis. Limited to space, the following mainly lists its simulation model and results.

Analysis.

Frequency conversion speed regulation system of induction motor with SPWM control mode

The overall block diagram of is shown in figure 1, including three-phase sine wave module,

Isosceles triangular wave generation module, speed frequency converter module and isosceles triangular wave generation module.

P I controller and other self-assembly modules. Figures 2 and 3 are respectively

Indicates the motor speed response under the constant load of motor speed step input.

Strain curve and electromagnetic torque curve.

Through the design of speed inverter, students can enter the first grade.

Understand the voltage-frequency ratio control principle of induction motor; By controlling P I

The design of controller and the adjustment of various control parameters consolidate the conventional control.

Influence of proportional adjustment coefficient and integral adjustment coefficient in controller on control system

Law of dynamic and static characteristics; By establishing SPWM model

And further familiar with its control.

Control principle and inverter output voltage

Voltage independent of modulation wave frequency

Amplitude is proportional to modulation.

Law; From the simulation of the whole control system

As a result, it can be seen that in signal generation

In this step, the whole control system changes.

Fluctuate, but then enter a new stability.

In the steady state, the speed fluctuation is shown in Figure 2.

The shape shows the change of speed with a given signal very intuitively.

The corresponding electromagnetic torque has also changed.

Fuzzy control simulation of 2 12 DC motor speed regulation system

MA TLAB？ Shamulin k contains a wealth of tools.

Frame, such as fuzzy controller, is a hot topic in automatic control theory at present.

Box, neural network control toolbox and wavelet analysis package. although

The teaching content of undergraduate intelligent control theory is not much involved, but

Students can also use MA TLAB software to enter the graduation project.

Conduct a preliminary study. Students take "Fuzzy DC Motor Speed Control System"

Control simulation ",introduces the principle and control effect of fuzzy control.

The main contents are as follows:

(1) On the basis of being familiar with the automatic control theory, according to the given pair

I like to establish its conventional P ID control system and use MA TLAB software.

The system is simulated by K language, and then the conventional P ID is analyzed.

The influence on the controlled object itself and the influence of various adjustment parameters on the control performance.

The influence law of indicators;

(2) Familiar with the theoretical basis of fuzzy mathematics and fuzzy control theory.

On this basis, a fuzzy control system is established according to the given object, including input and output.

Determination of input and output, calculation of proportional factor, establishment of control rules.

Stand up;

(3) Fuzzy controller is applied to nonlinear time-varying system.

Point-based DC motor double closed-loop speed regulation system, by changing motor parameters

Furthermore, the characteristics of adaptive quantity of fuzzy control are analyzed.

This graduation thesis is based on an actual separately excited DC motor.

As the controlled object, the main parameters of DC motor are: rated power

PN = 5hp, rated voltage UN = 240V, rated armature current IN =

16 12A, rated speed nr = 1220rpm, armature resistance R a =

0 168, inductance la = 01kloc-0/2h, excitation resistance R f= 2408, excitation.

Inductance L f= 120H, mutual inductance l f =118h. Its double closed-loop DC electricity

The fuzzy control model of motor speed regulation system is shown in Figure 4, which mainly includes

Comprises a current loop P I regulator model and a speed loop fuzzy controller. for

When the motor parameters change or the load changes suddenly, the control of the fuzzy controller is verified.

In this paper, the armature resistance is changed by adjusting the rotating speed in a steady state.

Response characteristics of simulated load mutation

The simulation results are compared with the situation that the speed loop adopts the conventional P ID controller.

All right, let's compare. Due to the limitation of space, only the changes of armature resistance are listed here.

When the load suddenly changes, the response characteristics are shown in Figure 5 and Figure 6.

The response characteristics of are shown in Figure 7 and Figure 8. In the figure, the curve "1" indicates that

The control effect when the conventional P ID control is adopted, and the curve "2" indicates the adoption.

Control effect of fuzzy control.

Figs. 5 and 6 show the rotational speed response when the armature resistance increases by 10%.

Stress curve and armature current response curve, as can be seen from the simulation curve,

When the armature resistance increases, fuzzy control has little effect on the control effect.

However, when the conventional P ID control is adopted, the dynamic control effect is poor and the transition time is short.

Interval length. Figs. 7 and 8 show a load torque step of 30 n m.

Speed response curve and armature current response curve, from the simulation curve can be

It can be seen that the fuzzy controller has good adaptability to the sudden change of load.

The transient process of force and armature current is very short, and finally reaches the given value.

Value; However, when the conventional P ID control is adopted, the armature is charged when the load suddenly changes.

The flow began to be out of balance, which made it difficult for the output speed to follow the given value.

3 Conclusion

The above two examples are just my evaluation of MA TLAB in teaching.

The application of S IMUL in K simulation software, while MA TLAB software.

Powerful, can be applied to many fields, but also can be studied.

Some hot topics today. In short, in electrical engineering,

It is very necessary to apply MA TLAB simulation software in teaching.

Through MA TLAB? S IMUL in K can make students more responsible.

Evolution of control system design thought and electrical engineering discipline.

Professional knowledge, thus improving students' ability to analyze and solve practical problems.

Further cultivate students' scientific research ability.