Space Vector Modulated PWM Generation for Motor Control Systems

Microcontroller based sample Space Vector Modulation for two-level three-phase voltage source inverter is discussed here. The system is designed in ATmega64, which is an 8-bit low cost microcontroller. A fixed number of sample is used to produce a full wave. Here, Timer overflow interrupt is used to generate every new sample. All the calculation is done in interrupt subroutine. With simple modification, the system can be integrated to a variable frequency drive (VFD) of induction motor. Simulations are performed in Matlab/Simulink and Proteus Design Suite. Similar results are found in both simulation tools. The simulation results show that the proposed modified method results in reduction of calculation cycle numbers in interrupt routine.