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

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

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

Introduction and Motivation

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

Problem Statement

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

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

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

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

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

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

Preliminary Results

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

Progress Result vs Reference

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

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

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

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

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.

Q&A Thanks!