7/31/2019 A New Hybrid High Power Factor Three Phase

1/33

Presented by

Ansu James

Roll Number : 4S2 M.Tech

Power Electronics

1

7/31/2019 A New Hybrid High Power Factor Three Phase

2/33

INTRODUCTION OBJECTIVE

HYBRID RECTIFIER

CIRCUIT GENERATION

EQUIVALENT CIRCUIT

MATHEMATICAL ANALYSIS

CONTROL STRATEGY

APPLICATION

CONCLUSION

REFERENCES

2

7/31/2019 A New Hybrid High Power Factor Three Phase

3/33

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

3

7/31/2019 A New Hybrid High Power Factor Three Phase

4/33

4

7/31/2019 A New Hybrid High Power Factor Three Phase

5/33

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

5

7/31/2019 A New Hybrid High Power Factor Three Phase

6/33

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.

6

7/31/2019 A New Hybrid High Power Factor Three Phase

7/337

7/31/2019 A New Hybrid High Power Factor Three Phase

8/338

7/31/2019 A New Hybrid High Power Factor Three Phase

9/33

SIMULINK MODEL OF A THREE PHASE BOOST RECTIFIER

9

7/31/2019 A New Hybrid High Power Factor Three Phase

10/3310

7/31/2019 A New Hybrid High Power Factor Three Phase

11/3311

7/31/2019 A New Hybrid High Power Factor Three Phase

12/33

12

7/31/2019 A New Hybrid High Power Factor Three Phase

13/33

13

step 1:

7/31/2019 A New Hybrid High Power Factor Three Phase

14/33

14

step 2:

7/31/2019 A New Hybrid High Power Factor Three Phase

15/33

15

7/31/2019 A New Hybrid High Power Factor Three Phase

16/33

16

7/31/2019 A New Hybrid High Power Factor Three Phase

17/33

17

7/31/2019 A New Hybrid High Power Factor Three Phase

18/33

7/31/2019 A New Hybrid High Power Factor Three Phase

19/33

MATHEMATICAL ANALYSIS

19

7/31/2019 A New Hybrid High Power Factor Three Phase

20/33

20

7/31/2019 A New Hybrid High Power Factor Three Phase

21/33

21

7/31/2019 A New Hybrid High Power Factor Three Phase

22/33

22

7/31/2019 A New Hybrid High Power Factor Three Phase

23/33

23

7/31/2019 A New Hybrid High Power Factor Three Phase

24/33

24

7/31/2019 A New Hybrid High Power Factor Three Phase

25/33

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.

25

7/31/2019 A New Hybrid High Power Factor Three Phase

26/33

26

7/31/2019 A New Hybrid High Power Factor Three Phase

27/33

CONTROL STRATEGY

27

7/31/2019 A New Hybrid High Power Factor Three Phase

28/33

28

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

7/31/2019 A New Hybrid High Power Factor Three Phase

29/33

29

7/31/2019 A New Hybrid High Power Factor Three Phase

30/33

Suitable for medium and high power

applications.

Possible for Trolley bus system.

30

7/31/2019 A New Hybrid High Power Factor Three Phase

31/33

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%.

31

7/31/2019 A New Hybrid High Power Factor Three Phase

32/33

7/31/2019 A New Hybrid High Power Factor Three Phase

33/33