This document presents information on forced commutated cycloconverters. Cycloconverters directly convert AC power of one frequency to a different frequency. The document discusses types of cycloconverters including single phase to single phase and three phase configurations. It provides circuit diagrams and Simulink models of midpoint and bridge types. Applications include rolling mill drives, ship propulsion, and cement mill drives. Advantages are direct frequency conversion and regeneration capabilities. Disadvantages include complex control and large number of required thyristors. A research paper on cycloconverter-based double-ended microinverters for solar power is also summarized.

1. FORCED COMUTATED
CYCLOCONVERTER
Presented by:
Rohit kumar
(M.E student)
Submitted to:
Er.Shimi S.L
(Assistant Professor)

2. INTRODUCTION
Cycloconverters directly convert ac power
of one frequency to ac power of different
frequency.

3. CYCLOCONVERTERAC (ONE FREQ.) AC(DIFFERENT FREQ.)

4. BLOCK DIAGRAM
OF
CYCLOCONVERTER

5. Power
supply
Negative
converter
Load
Positive
converter

6. CLASSIFICATIONS
CYCLOCONVERTER
1-ф to1-ф 3-ф to 1-ф 3-ф to3-ф
Midpoint Bridge 1-ф ,3-pulse 1-ф ,6-pulse 3-ф ,3-pulse 3-ф ,6-pulse
Output Output Output Output

7. SINGLE PHASE TO
SINGLE PHASE
CYCLOCONVERTER
F O/PF I/P

8. CIRCUIT DIAGRAM

9. BRIDGE TYPE
AC SUPLY
P1 P3 N1 N3
LOAD
P4 P2 N4 N2

10. MIDPOINT TYPE
P1
N1
P2
N2
LOAD

11. WORKING OF STEP DOWN
CYCLOCONVERTER WITH
SIMULINK MODEL

12. MID-POINT TYPE

13. OUTPUT OF SIMULINK MODEL
OTPUT FREQ.=(INPUT FREQ)/2

14. SIMULINK OUTPUT

15. WORK SPACE WAVE FORM

16. BRIDGE TYPE

17. SIMULINK OUTPUT

18. WORK SPACE WAVE FORM

19. WORKING OF STEP -UP
CYCLOCONVERTER

20. OUTPUT OF SIMULINK MODEL
OTPUT FREQ.=2*(INPUT FREQ.)

21. MID-POINT TYPE

22. SIMULINK OUTPUT

23. WORK SPACE WAVE FORM

24. BRIDGE TYPE

25. SIMULINK OUTPUT

26. WORK SPACE WAVE FORM

27. 3-PHASE
CYCLOCONVERTER

28. THREE PHASE TO
SINGLE PHASE
CYCLOCONVERTER
F O/PF I/P

29. SCHEMATIC DIAGRAM
Positive group Negative group
Load
Neutral

30. CIRCUIT CONFIGRATION
+GROUP - GROUP
LOAD
NEUTRAL

31. An output phase wave is achieved by
sinusoidal modulation of the thyristor
firing angles

33. Advantages of cycloconverters:
 Direct frequency conversion without any intermediate stage.
 Power transfer in either directions.
 Operates in any power factor
 Capable of regeneration over the complete speed range, down to
standstill.
 Commutation failure leads only to blown-off of individual fuses
only.
 Delivers a high quality sinusoidal waveform at low output
frequencies since it is fabricated from a large number of segments
of the supply waveform.
 This is often preferable for very low speed applications.

34. Applications
 Rolling mill main drives
 Mine hoist drives
 Ship propulsion
 Cement mill drives
 Scherbius drives
 Ore grinding mills
 Mine winders

35. Disadvantages of cycloconverters
 Complex control circuitry.
 Large number of thyristors are required in a Cyclo
converter.
 The power factor is low, particularly at reduced output
voltages.

36. RESEARCH PAPER
Cycloconverter-Based Double-Ended Microinverter
Topologies for Solar Photovoltaic AC Module
Ravi Kiran Surapaneni, Student Member, IEEE, Dorai
Babu Yelaverthi , and Akshay Kumar Rathore, Senior
Member, IEEE
IEEE JOURNAL OF EMERGING AND SELECTED
TOPICS IN POWER ELECTRONICS, VOL. 4, NO. 4,
DECEMBER 2016

37.  Abstract—This paper investigates a novel half-bridge
cycloconverter configuration on load side with devices operating
at line frequency, thus providing direct high-frequency ac to line
frequency ac conversion with transformer isolation. This paper
also presents a detailed comparative study and evaluation of
double-ended converters, viz., full-bridge, half-bridge, and push–
pull-based microinverter topologies for solar photovoltaic ac
module. Double-ended converters offer merits of no transformer
saturation, reduced transformer, and filter size. Simple sinusoidal
pulse width modulation for standalone mode and current control
for grid-tied mode are implemented for front-end devices.
Comparative study reveals that half-bridge topology is cheaper
than the other two topologies and has comparable efficiency with
full bridge. A 250-W laboratory prototype of half bridge
microinverter is developed, and experimental results are
demonstrated to show its performance under various conditions,
i.e., standalone, grid-tied, and change of current references.

38. REFERENCES
1. Mohammed Abdul Khader Aziz Biabani, Md Akheel Pasha
“Performance Analysis of Step up and Step down Cyclo
converter” , (ICEEOT) - 2016
2. Dogga Raveendhra , “Simulation based Study of FPGA
Controlled Single-Phase Matrix Converter with Different Types
of Loads”,ACEEE
3. Burak Ozpineci, Leon M. Tolbert ,“CYCLOCONVERTERS”,
University of Tennessee-Knoxville
4. Power Electronics , Dr.P.S.Bimbhra, Khanna Publishers

39. CONTINUE….
5. Cycloconverter-Based Double-Ended Microinverter Topologies
for Solar Photovoltaic AC Module, Ravi Kiran Surapaneni, Student
Member, IEEE, Dorai Babu Yelaverthi , and Akshay Kumar
Rathore, Senior Member, IEEE, IEEE JOURNAL OF EMERGING
AND SELECTED TOPICS IN POWER ELECTRONICS, VOL. 4,
NO. 4, DECEMBER 2016