Matlab Simulink modeling and design of single-phase AC-AC frequency converter, with MATLAB simulation, PPT and papers

Design Overview
In this paper, the three-phase input and single-phase output of AC motor are introduced - Take AC frequency conversion circuit as an example , Introduction to cross - Basic working principle of AC frequency conversion circuit , The cosine intersection method is used as the trigger control algorithm of AC-AC frequency conversion circuit , Logic circulation free controller is adopted DLC Technical support for the alternating operation of positive thyristor and reverse thyristor , The use of MATLAB R2012a The simulation software builds a single intersection - Simulation model of cycloconverter , And debugged , The circuit model can output adjustable amplitude 、 Frequency adjustable sinusoidal waveform .

introduction
hand over - The cycloconverter is controlled by the switch of power electronic circuit , Without passing through the intermediate DC link , After only one change, the power frequency AC can be transformed into AC of different frequencies , The main circuit is composed of two groups of anti parallel thyristor three-phase rectifier bridge circuits , When the positive thyristor works , Get a forward current on the load , When the reverse thyristor works , Get reverse current on the load , By controlling the switching speed of positive and negative thyristors, alternating current with different frequencies can be obtained .

The cycloconverter works stably , reliable . Its highest output frequency is... Of the grid frequency 1/3-1/2, It has great advantages in high-power low-frequency range . AC-AC frequency conversion has no DC link , High frequency conversion efficiency , The main circuit is simple , Excluding DC circuit and filter part , Reactive power processing and active power feedback between and power supply are easy . But because of its low power factor , There are many higher harmonics , Low output frequency , The range of variation is narrow , The large number of components used limits its application , Therefore, it is widely used in high-power AC motor speed regulation drive system .

Single intersection - Cycloconverter frame

Simulation analysis
（1） When the output frequency of a given signal is f=10Hz when , The trigger angle is 30 degree when , The voltage and current waveforms are as follows .

（2） When the output frequency of a given signal is f=25Hz when , The trigger angle is 30 degree when , The voltage and current waveforms are as follows .

The design content is detailed , cover Modulation method of output sine wave voltage 、 Principle description of level detection circuit 、 Principle description of logic judgment circuit 、 Principle description of interlocking protection circuit 、 Principle description of phase shift angle control circuit The content such as .

The content of resource sharing includes
（1）Matlab Simulation file ;
（2） be based on Matlab Simulink Design document of single-phase AC-AC converter 【 Full version 】;
（3）20 page PPT Demo document ;

The screenshot of resources is as follows




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