1. A Hybrid AC/DC Microgrid
and Its Coordination Control
1/8/2020
DEPARTMENT OF ELECTRICAL & ELECTRONICS
ENGINEERING
BILLA.DIVYA PRAKASH

2. Abstract
The microgrid concept introduces the reduction of multiple conversions in an
individual AC or DC grid and also facilitates connections to variable renewable
AC and DC sources and loads to power system.
Here photovoltaic system, wind turbine generator and battery are used for the
development of microgrid. Also control mechanisms are implemented for the
converters to properly coordinate the AC grid to DC grid. We are implementing
this project by using Simulink(MATLAB) software.
1

3. Contents
 Aim of the project.
 Introduction to Microgrid.
 Conventional Grid versus Microgrid.
 Power plants interconnected to Microgrid.
 Block Diagrams.
 Simulation Diagram.
 Simulation results.
 Advantages of Micro Power generation.
 Conclusion.
 References. 1/8/2020
2

4. Aim of the Project
 To supply the reliable quality power with lowest unit price.
 Generation of noiseless &pollution free electrical power.
1/8/2020
3

5. Introduction
Microgrid
A microgrid is a localized grouping of electricity generation, energy storage, and
loads that normally operates connected to a traditional centralized grid (Conventional
grid).
 It is a small scale power supply network that is designed to provide power for a
small community.
 It enables local power generation for loads.
The Need Of Microgrid:
1.Transmission losses are highly reduced.
2. Provide high quality and reliable energy supply to critical loads.
4

6. Microgrid VS Conventional grid
6
•Efficiency:
High
•Power sources:
Are small and nearer to loads.
•Wastage:
Very few amount of energy can wasted.
•Cost:
Lower design cost
•Size:
Smaller in size
•Efficiency:
Low
•Power sources:
Are large and far to loads.
•Wastage:
Large amount of energy can wasted in
the form of heat.
•Cost:
Higher design cost
•Size:
Bigger in size
5

7. PV Panel Working of PV Panel6

8. Wind Turbine Generator7

9. AC/DC Microgrid And Its Coordination Control8

10. AC/DC Microgrid System9

11. Simulation Diagram of PV panel10

12. Simulation Diagram of wind turbine11

13. Simulation Diagram of Hybrid AC/DC Microgrid
and Its Coordination Control
12

14. Simulation results of Hybrid AC/DC Microgrid
System
13

15. Terminal voltage of solar panel
1. Grid-Connected Mode14
0 2 4 6 8 10 12
x10
4
250
260
270
280
290
300
310
time(s)
voltage

16. PV output power versus solar irradiation
15
0 2 4 6 8 10 12 14
x 10
4
0
0.5
1
1.5
2
2.5
3
3.5
4
x 10
4
time(S)
power(W),irradiation(W/m2)

17. AC side voltage and current of the main converter with
variable solar irradiation level and constant DC load
16
0 2 4 6 8 10 12
x 10
4
-80
-60
-40
-20
0
20
40
60
80
time(S)
voltage(V)
current(I)

18. DC bus voltage transient response
17
0 2 4 6 8 10 12
x 10
4
0
50
100
150
200
250
300
350
400
450
Time(S)
voltage(V)

19. AC side voltage and current of the main converter with constant
solar Irradiation level and variable dc load
18
0 2 4 6 8 10 12
x 10
4
-80
-60
-40
-20
0
20
40
60
80
Time(S)
voltage(V)
current(A)

20. Output power of the doubly fed induction generator
19
0 2 4 6 8 10 12
x 10
4
0
0.5
1
1.5
2
2.5
3
3.5
x 10
4
Time(s)
PowerofDFIG(KW)

21. AC side voltage versus current
20
0 2 4 6 8 10 12
x 10
4
-80
-60
-40
-20
0
20
40
60
80
Time(S)
PowerofDFIG(KW)

22. 2. Isolated Mode21
0 2 4 6 8 10 12
x 10
4
-60
-50
-40
-30
-20
-10
0
10
20
30
40
Time(S)
current(A)
0 2 4 6 8 10 12
x 10
4
79.999
79.9995
80
80.0005
80.001
80.0015
80.002
80.0025
80.003
80.0035
80.004
Time(S)
SOC

23. 22
0 2 4 6 8 10 12 14
x 10
4
0
50
100
150
200
250
300
350
400
450
Time(S)
voltage(V)

24. 23
DC Bus voltage
0 2 4 6 8 10 12 14
x 10
4
-0.5
0
0.5
1
1.5
2
2.5
3
3.5
4
x 10
4
Time(S)
power(KW)
PV output Power
0 2 4 6 8 10 12 14
x 10
4
0
10
20
30
40
50
60
70
Time(S)
current(A)
Battery current

25. Advantages Of Micro Power generation
 Low cost
 Simple expansion of the system
 Simplified supervisory control
 Increase reliability
 Increased quality of service
24

26. Conclusion
 A microgrid with the integration of PV and wind systems is developed using
MATLAB/Simulink and also discussed the results of individual and
interconnected operation. this work is to develop intelligent power management
system and also a coordination control between the converters is needed to reduce
the processes of multiple AC-DC or DC-AC conversions.
 The AC/DC microgrid can provide a reliable, high quality and more efficient
power to consumer. The microgrid maybe feasible for small isolated industrial
plants with both PV systems and wind turbine generator as the major power
supply.
25

27. References
 1. R. H. Lasseter, “Micro Grids,” in Proc. IEEE Power Eng. Soc. Winter Meet., Jan.
2002, vol. 1, pp. 305–308.
 2. Y. Zoka, H. Sasaki, N. Yorino, K. Kawahara, and C. C. Liu, “An interaction
problem of distributed generators installed in a Micro Grid,” in Proc. IEEE Elect.
Utility Deregulation, Restructuring. Power Technol., Apr. 2004, vol. 2, pp. 795–799.
 3. R. H. Lasseter and P. Paigi, “Micro grid: A conceptual solution,” in Proc. IEEE 35th
PESC, Jun. 2004, vol. 6, pp. 4285–4290.
 4. C. K. Sao and P. W. Lehn, “Control and power management of converter fed Micro
Grids,” IEEE Trans. Power Syst., vol. 23, no. 3, pp. 1088–1098, Aug. 2008.
 5. T. Logenthiran, D. Srinivasan, and D.Wong, “Multi-agent coordination for DER in
Micro Grid,” in Proc. IEEE Int. Conf. Sustainable Energy Technol., Nov. 2008, pp.
77–82.
26

28. 1/8/2020
27

29. 1/8/2020
28