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Presented by
Ansu James
Roll Number : 4S2 M.Tech
Power Electronics
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INTRODUCTION OBJECTIVE
HYBRID RECTIFIER
CIRCUIT GENERATION
EQUIVALENT CIRCUIT
MATHEMATICAL ANALYSIS
CONTROL STRATEGY
APPLICATION
CONCLUSION
REFERENCES
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The unidirectional hybrid three-phase rectifier is
composed of the parallel association of a single switch
three-phase boost rectifier with a PWM three phase
unidirectional rectifier.
The proposed structure allows to obtain a THD varying
between 0 and 32%, just depending on the power
processed by PWM three phase unidirectional rectifier
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The first objective is to obtain a structure capable of
providing sinusoidal input currents with low harmonic
distortion and dc output voltage regulation.
The main objective is to process the higher output
power rating with the single switch three phase boost
rectifier and the remaining with an active structure
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Hybrid Rectifier denotes the series and/or parallelconnection of a line commutated rectifier(passive rectifier)and a self commutated converter(active rectifier).
Passive rectifier operates with low frequency and it handlesthe higher output power rating.
Active rectifier operates with lower power ratings and withhigh switching frequency.
It combines the robustness and the efficiency of passiverectifier with the low harmonic production of the activerectifier.
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SIMULINK MODEL OF A THREE PHASE BOOST RECTIFIER
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step 1:
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step 2:
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MATHEMATICAL ANALYSIS
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The expressions (9) and (10) are very important to define theactive power sharing between the two converters. If this
relation is not satisfied, the input currents will be distorted.
However, it is possible to meet the standards requirementsconfiguring the hybrid rectifier to operate in a such way that
the active rectifier is responsible to handle only 33% of the
rated power.
In this case, the currents on the mains will present a small
distortion, as depicted in Fig where the shaded areas denote
the intervals were the relation is not satisfied.
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CONTROL STRATEGY
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Gains ratio should bequiet close to 0.552 for
perfect sinusoidal
currents.
If the ratio is greater than
0.552 the imposed line
currents will be distorted
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Suitable for medium and high power
applications.
Possible for Trolley bus system.
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A novel three-phase hybrid rectifier to high power applicationswas proposed.
The fact that each rectifier is responsible to process about 50%
of the output power allows improving the robustness andproviding a high efficiency of the power converter
The proposed structure allows to obtain a THD varying
between 0 and 32%.
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