DEPARTMENT OF ELECTRICAL POWER ENGINEERING

COLLEGE OF ENGINEERING

POWER ELECTRONICS

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Harmonic Control of Full Bridge Inverter Example:

The full bridge inverter shown has a switching frequency sequence that produces a square wave voltage across a series RL load. Assuming that = 30 degrees.

Determine:

  • a.Amplitude of the fundamental frequency voltage
  • b.DC input voltage
  • c.Amplitudes of the Fourier series terms for load voltage
  • d.Amplitudes of the Fourier series terms for load current
  • e.Total harmonic distortion (THD) of the load voltage and the load current

Please enter the input value:

Fundamental frequency current amplitude: A

Resistance:

ohm
Inductor: mH
Switching Frequency: Hz

The amplitude of load voltage is determined from

Vn = (4 Vdc* cos(n)) / n

The amplitude of each current is determined from

In = Vn /Zn

 

a)

Amplitude of the fundamental frequency voltage = V1 = V

b)

DC input voltage = Vdc = V

See Fourier Series Analysis

c)and d)

n
fn(Hz)
Vn(V)
Zn()
In(A)
1
3
5
7
9
11

e)

THDv = = %

THDI = = %

Click for explanation.

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