Design of Three Phase Sinusoidal Pulse Width Modulation Inverter
Keywords:
SPWM (Sinusoidal Pulse Width Modulation), PWM (Pulse Width Modulation), MATLAB, Inverter, Induction Motor, Frequency Modulation, Speed Regulation of AC Motor, MOSFET, Diode, DC Link, triggering signal, open loop controlAbstract
As the use of renewable energy sources are increased and will going to be increased to a large
extend in future. Specially, solar energy will going to play a huge role as a major energy source. The output of
the inverter is direct current, so an inverter becomes a critical component for the flow of electricity from solar
modules to storage battery, loads and grids.A three phase voltage source inverter Sinusoidal Pulse Width
Modulation based inverter is going to be utilized. High frequency triangular carrier wave is compared with
sinusoidal reference wave of desired frequency. The width of each pulse is varied in proportion to the amplitude
of a sine wave called SPWM. The advantage of SPWM technique is that it reduces the harmonic contents of the
output voltage compared to single pulse width modulation and multi-pulse modulation. The advantage of
inverter with two stage three phase bipolar SPWM is good performance and efficiency as it doubles the
switching frequency of inverter voltage and so the output filter becomes smaller, cheaper and easier to
implement. A three phase two level SPWM inverter based voltage source inverter is going to be simulated for
with and without filter across resistive load using MATLAB and the Total Harmonic Distortion of both is
compared. The application of SPWM inverter in speed control of three phase induction motor by volts/hertz
method is implemented. MATLAB simulation for speed control of induction motor is simulated and its THD
analysis along with current and voltage is carried out. A hardware implementation of speed control of
induction motor is made.
