SVPWM (Space Vector Pulse Width Modulation)
Sinusoidal PWM has been a very popular technique used in AC motor control. This relatively unsophisticated method employs a triangular carrier wave modulated by a sine wave and the points of intersection determine the switching points of the power devices in the inverter.
However, this method is unable to make full use of the inverter’s supply voltage and the asymmetrical nature of the PWM switching characteristics produces relatively high harmonic distortion in the supply.
Space Vector PWM (SVPWM) is a more sophisticated technique for generating a fundamental sine wave that provides a higher voltage to the motor and lower total harmonic distortion (THD). It is also compatible for use in vector control (Field orientation) of AC motors.
This abstract describes the theory of SVPWM and the project shall be made using a programmed microcontroller of 8051 family duly interfaced to 3 phase six pulse inverter with 6 no’s MOSFET from DC derived from a single phase mains or 3 phase, 50 Hz supply. The load shall be a three phase 50 Hz 440volt 0.5 HP motor. Alternatively a star lamp load can be used in place of motor to view the waveform only.
Further this project can be enhanced by using IGBT instead of MOSFET for higher voltage power operations. Speed control of the motor can also be achieved by V/F method.
NOTE: A 3 phase induction motor of 0.5HP or 1HP is required to see the output. Motor is not supplied along with the kit. However, it can be purchased at extra cost.
- Easy to use, Self-explanatory kit.
- All-inclusive solution kit.
- Extensive audio-visuals available.
- Branding-free material.
- Pre-programmed Microcontroller.
- Single to Three Phase Converter.
- Call/mail for Tech Support from 10 am - 7 pm.
- Can be Customized for Arduino, Raspberry Pi, PIC
- 8051 series Microcontroller
- Gate Driver
- Crystal Oscillator
- Toggle Switches
- Keil compiler
- Languages: Embedded C or Assembly
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Order No: BQF3698
Q: Which microcontroller is used in this project?
A: A 40 pin microcontroller from 8051 family is used in this project.
Q: What is SVPWM?
A: SPWM or sine pulse width modulation is a type of pulse modulation wherein the triangular carrier signal is compared with the sinusoidal reference signal to generate the pulse modulated signals.
Q: What is the rating of motor to be used in this project?
A: 3 phase, ¼HP motor is used in this project.
Q: What is the switching frequency?
A: 3.5KHz is the switching frequency.
Q: What is the function of MOSFET in this project? Can we use BJT instead of MOSFET?
A: Here, MOSFET is used as a switch. BJT can be used, but that needs drive current and not voltage as required for MOSFET.
Q: What is the formula for calculating smoothing capacitor value?
A: There is some approximated formula .Peak to peak ripple voltage = Load current in amps / (2*line frequency in hertz *capacitance in farads). But as rule of thumb for 1 A current 1000uF is best. Thus it is load dependent.
Q: How frequency and phase shift is maintained in the program?
A: Switching at 3.5 KHz as frequency has been taken with 120 degree phase shift, all in the program for 6 stage switching as per SVPWM norms.