Title: Hybrid Advanced Power SourcesHAPS Project Highlight VTB Annual Review 2002
1Hybrid Advanced Power Sources(HAPS) Project
HighlightVTB Annual Review 2002
- Lijun Gao
- Roger Dougal
- Shengyi Liu
2Topics
- Design and build VTB battery model
- - Sony US18650 Lithium ion battery
- Import SAFT battery model from Matlab/Simulink
into VTB - Active power sharing between battery and super
capacitor hybrids
3Design and build VTB battery model_1
- Battery model equivalent circuit
- Port 1-2 Nonlinear voltage source in series with
an internal resistor - Port 0-2 First order transient response network.
- Reference
- Dynamic lithium ion battery model for system
simulation, Lijun Gao, Shengyi Liu, Roger A.
Dougal, Accepted by IEEE Trans on Components and
Packaging, Jun. 2002.
4Design and build VTB battery model_2
Model steady state study (compare with
manufacture's data)
280mA 700mA 1000mA 1400mA 2800mA
45 oC 34 oC 23 oC 10 oC 0oC -10 oC -20oC
- Manufacturer
- - Simulation
Constant current discharge (23 oC)
- Discharge characteristics on temperature
Battery charge characteristics (CC-CV)
5Design and build VTB battery model_3
- Transient response study in CDMA2 test
CDMA2 test profile
One pulse comparison
- Transient response study in GSM test
Simulation
Experiment
GSM test profile
6Import SAFT battery model from Matlab/Simulink
into VTB_1
Battery model in Matlab/Simulink
- Model has five user parameters and two signal
ports. - Model expects input in form of Power Request
- Model has no voltage and current terminals, so it
can not be immediately connected to circuit.
7Import SAFT battery model from Matlab/Simulink
into VTB_2
- Erase the input of Power Request
- Add two natural terminals Battery Current and
Battery Voltage
8Import SAFT battery model from Matlab/Simulink
into VTB_3
- Matlab/Simulink model could be easily imported
into VTB environment with natural coupling even
without knowing model internal details.
9Compare results running model in VTB and in
Simulink
Import SAFT battery model from Matlab/Simulink
into VTB_4
Simulation result in Simulink
Constant current discharge at 16A
Simulation result in VTB
10Passive Battery/Capacitor Hybrid
Active Power Sharing Between Battery and
Capacitor_1
- Advantages over battery alone
- High peak power enhancement
- High efficiency
- However
- Battery current still has large ripple
- The battery voltage cannot be different from the
capacitor voltage
11Active Power Sharing Between Battery and
Capacitor_2
- Active Batt/Cap/Conv Hybrid
Conv output
Load
Cap
The control purpose of the control model is to
control converter output current to be constant
and equal to the load average current
- Control battery current to be constant to further
decrease battery stress
12Active Power Sharing Between Battery and
Capacitor_3
- Build experiment system according to VTB
simulation
- The same control algorithm used in the VTB
simulation is also used here.
DC/DC converter
- SonyUS18650
- Maxwell PC100
Construction of experimental test
13Active Power Sharing Between Battery and
Capacitor_4
- Experimental data under pulse current discharge
- Critical pulse
- current test at 40A
- Period 5 s
- Duty 10
Battery current
Converter output current
- Battery current ripple 2.35-2.17 0.18 A
- IBattAver 2.28A
- Battery current is almost constant
- PLoadON 3.340 132 w
- Capacitor voltage ripple 1.4V
Capacitor voltage
14Active Power Sharing Between Battery and
Capacitor_5
Comparison Among Three Types Power Sources
- Compare with battery alone and passive batt/cap
hybrid - Active batt/cap/conv hybrid could have very high
power enhancement - Power source weight and volume could be further
decreased