1. Microgrid Converter Modeling and Control
Chris Leonard and Baylor Howard
Advisors: Dr. Jing Wang & Dr. In Soo Ahn
Department of Electrical and Computer Engineering
Bradley University
Nov 29, 2018

2. Project Outline Introduction and Motivation Problem Statement
Subsystem Modules
Research Tasks
Preliminary Results
Timeline and Work Division
Budgets
Conclusions

3. Introduction and Motivation
Fossil fuels more damaging than helpful
Renewables have room for growth
Energy Gen. v Damage Done, 2015.

4. Introduction and Motivation

5. Introduction and Objective
Solar powered microgrid
To improve efficiency of Solar powered microgrid, in this project, we propose to study the control and modeling problem of converters in Microgrids

6. Problem Statement

7. System Flow Chart
Two stages:
--DC/DC
--DC/AC

8. General System G(s) = Vs/(L*C(s^2+s/R*C+1/L*C)) Filter
D(s) = (Td*s+1)/(𝞪*Td*s+1) Lead Compensator
D = Vref/Vs Duty Ratio Nominal Value
Vref= Reference Voltage
1/Vp= PWM

9. Buck Converter
Step down
Vo = D*Vs
D: duty cycle

10. Boost Converter
Step up (boost)
Vo=Vs/(1-D)

11. DC/AC Inverter Inverts from flat DC signal, to an AC sinusoidal wave
Future component

12. Research Tasks Control Algorithms Design -- DC/DC Converter Control
-- DC/AC Inverter Control (Matlab)
Software simulation (Matlab and Pspice)
Hardware Implementation
Validation / Load Specifications

13. Preliminary Results

14. Output from Pspice
Vref = 3.3v
Vs = 6v
Load change at 1.5ms

15. Progress
Result vs Reference

16. System Integration C2000 Microgrid Board from TI
Use DC source to begin

17. Timeline November & December (FA18) January (SP19) February (SP19)
PSpice model fully functioning for buck converter with controller.
Set up website
January (SP19)
Model Boost Converter in PSpice
February (SP19)
Model Inverter in PSpice and implement buck, boost and inverter on breadboard.
March (SP19)
Refine physical design and explore possibility of implementing 3 phase as an output of our system.
April (SP19)
Finalize physical design

18. Budget Buck converter- $200 C2000 inverter- $800
Matlab standard perpetual license- $2150 (lifetime purchase)
Pspice designer package- $1980

19. Conclusions Fossil fuel is finite, solar essentially not
Attempt to move towards more reliable renewable sources
Develop more efficient methods

20. References
Y. Lu, “Advanced grid-tied photovoltaic micro-inverter”, University of Canterbury, Christchurch, New Zealand, 2015.
Texas Instruments, “Digitally controlled solar micro inverter design using C2000 Piccolo microcontroller,” TIDU405B datasheet, Oct.2014 [Revised June 2017].
D. Hart, “Power Electronics.” New York: McGraw-Hill, 2011, p. 199.
D. Hart, “Power Electronics.” New York: McGraw-Hill, 2011, p. 212.
D. Hart, “Power Electronics.” New York: McGraw-Hill, 2011, p. 337.
D. Hart, “Power Electronics.” New York: McGraw-Hill, 2011, p. 316.

21. Q&A
Thanks!