𝑉𝐴𝐵,𝑚𝑎𝑥 = 0.612 𝑚 − 1 𝑉𝑑𝑐
Objectives
Progress
Approach Challenges
Future Plans
SiC-Based Direct Power Electronics Interface for Battery Energy
Storage
System into Medium Voltage Distribution System (Project
GR-17-03)
Janviere Umuhoza, Haider Ghazi Mhiesan , Kenneth Mordi, Chris
Farnell, H. Alan MantoothNSF I/UCRC on GRid-connected Advanced
Power Electronic Systems (GRAPES), University of Arkansas
The team is grateful for the financial support from the National
Science
Foundation Industry/University Cooperative Research Center
on
GRid-connected Advanced Power Electronic Systems (GRAPES).
Contact: Janviere Umuhoza- [email protected] | H.Alan Mantooth -
[email protected]
Contact Information & Acknowledgments
• Using ≥ 10 kV SiC modules to build a power
electronics interface to integrate battery energy
storage into a medium voltage distribution system
• Transformerless interface, without the bulk step-up
60 Hz transformer
• Taking advantage of high break-down voltage of
SiC devices to minimize the number of modules
Medium Voltage
Distribution Line
DC/AC Three-Phase
Inverter
Step-up
60 Hz
Transformer
Medium Voltage
Distribution Line
DC/AC Three-Phase
MMC Inverter
Transformerless
MMC: Multililevel
Modular
Cascaded
• Multi-level Modular Cascaded H-bridge Inverter is used to
realize a
transformerless power electronics interface
• The topology with H-bridge cells has a reverse blocking
capability,
preventing AC-infeed into DC side short circuits
• Galvanic isolation and BIL requirement
• Active-power control of individual converter cells
• State of charge balancing
• Fault tolerance of the cascaded converter
• Control structure is highly centralized
• Complex system management
• Synchronization of PWM signals
Centralized Control Structure Decentralized Control
Structure
• Proof of the concept Open loop simulation results
and testing results of the
topology
• Multi-carrier PWM
generation Phase-shifted PWM
• Active-power control
simulation Discharging the batteries
Charging the batteries
• Low-voltage prototype
• Signal conditioning board for closed loop controls
• On-going simulations in MatLab Simulink
• Galvanic isolation and BIL requirement
• AC filter design
• Design a fault tolerance scheme
• Implement the controls using CPLD/FPGA
• Build a high voltage prototype
Low voltage prototype A high voltage prototype
Topology with H-bridge cells
Open-loop testing results
Active power control
simulation results
1.2 kV, 50 A SiC
MOSFET module
SiC
Device
DC Bus
Voltage
# of
cells
AC 3Փoutput
1.2 kV 720 V 4 3. 525 kV
3.3 kV 1.98 kV 4 9.694 kV
10 kV 2.82 kV 4 13.8 kV
Hard switching, 40% safety
margin, amplitude modulation
ma = 1.
𝑉𝐴𝐵,𝑚𝑎𝑥 = 0.612 (𝑚 − 1) 𝑉𝑑𝑐Wℎ𝑒𝑟𝑒 𝑚 = 2𝑁 + 1, 𝑎𝑛𝑑𝑁 = # 𝑜𝑓 𝑐𝑒𝑙𝑙𝑠
𝑝𝑒𝑟 𝑝ℎ𝑎𝑠𝑒
Time (Sec)
Wat
tsV
olt
sA
mp
sV
olt
s
Vo
lts
mailto:[email protected]:[email protected]
