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A New Pulse Width Modulation Technique for Inverters

  • Research Article - Electrical Engineering
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Abstract

The pulse width modulation (PWM) technique is a method to control the modern power electronics circuits. The basic idea is to control the duty cycles of the switches in such a way that a load sees a controllable average voltage. In this paper, for single-phase and three-phase inverters, a new modulation method based on PWM technique is proposed. The proposed method can generate the desired output voltages from regulated and unregulated input voltage. In three-phase inverters, using the proposed control method, it is possible to produce the desired balanced and unbalanced output voltages. Low value of total harmonics distortion and elimination of low-order harmonics are other advantages of the proposed control method. The simulation and experimental results of single-phase and three-phase inverters are used to prove the correctness operation of proposed control method in generation of desired output voltages.

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Abbreviations

E off,k :

The turn-off loss of the switch k

E off,ki :

The energy loss of the switch k during the ith turning-off

E on,k :

The turn-on loss of the switch k

E on,ki :

The energy loss of the switch k during the ith turning-on

f i :

Input frequency

f s :

Switching frequency

f o :

Output frequency

i i :

Input current

I :

The current through the switch before turning off

I dc :

Average of the input current

I′:

The current through the switch after turning on

i a , i b and i c :

Output currents

i o :

Instantaneous output current

I m :

Peak value of the fundamental component of the output current

L :

Inductance of the load

m :

Switching pattern

max [−v dc (t)]:

Input voltage lower band

min [v dc (t)]:

Input voltage upper band

N on,k :

The number of turning on and off the switch k during a fundamental cycle

N off,k :

The number of turning on and off the switch k during a fundamental cycle

P c :

Conduction Loss of the inverter

P in :

The input power of the inverter

P loss :

The total loss of the inverter

P out :

The output power of the inverter

P sw :

The switching power loss

R :

Resistance of the load

R D :

The equivalent resistance of the diode

R T :

The equivalent resistance of the transistor

S k :

kth switch

\({t_k^i }\) :

kth time interval in ith sequence

t off :

The turn-off time of the switch

t on :

The turn-on time of the switch

T s :

Sampling time

v a , v b and v c :

Output phases voltages

v ab , v bc and v ca :

Output lines voltages

v dc :

Instantaneous input voltage

v o (t):

Instantaneous output voltage

V am :

Peak value of the output phase voltage v a

V bm :

Peak value of the output phase voltage v b

V cm :

Peak value of the output phase voltage v c

V dc :

Value of regulated dc voltage

V D :

The forward voltage drop on the diode

V m :

Peak value of output voltage

V r :

Peak value of the input voltage ripple

V sw,k :

The off-state voltage on the switch k

V T :

The forward voltage drop on the transistor

x(t):

Number of conducting transistors at instant t

y(t):

Number of conducting diodes at instant t

t :

Time

β :

A constant related to the specification of the transistor

ϕ o :

Phase difference between the output voltage and current

η :

The efficiency of the inverter

λ b :

Unbalanced coefficient of the phase b

λ c :

Unbalanced coefficient of the phase c

ω o :

Angular frequency of output voltage

ω r :

Angular frequency of ripple of input voltage

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Correspondence to Ebrahim Babaei.

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Babaei, E. A New Pulse Width Modulation Technique for Inverters. Arab J Sci Eng 39, 6235–6247 (2014). https://doi.org/10.1007/s13369-014-1215-3

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  • DOI: https://doi.org/10.1007/s13369-014-1215-3

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