Design and Control of an Integrated BMS/DC-DC System for ... and...INTRODUCTION. Design and Control...
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INTRODUCTION Design and Control of an Integrated BMS/DC-DC System for Electric Vehicles Fan Zhang 2 , M. Muneeb Ur Rehman 1 , Regan Zane 1 and Dragan Maksimovic 2 1 Utah State University, 2 University of Colorado Boulder SELECT Annual Meeting and Technology Showcase – Logan, Utah – September 27-28, 2016 S YSTEM CONTROL APPROACH Each DC-DC module, shown by the dotted blue boxes, has a local current feedback loop. The central BMS controller, shown by the dotted orange box, incorporates the voltage compensator and delta SOC compensator that perform LV bus voltage regulation and cell balancing, respectively. CONVERTER CURRENT REGULATION In existing EVs, the battery balancing system and HV-to-LV DC-DC converter operate independently. The proposed integrated BMS/DC-DC system can provide enhanced power capability and improved system efficiency by using the LV DC bus load to actively balance battery cells. The proposed control strategy uses a combination of central and local controllers to reliably balance the combined requirements for cell state regulation, cell current protection, and bus voltage regulation. LV bus HV bus Auxiliary loads Battery monitoring IC Battery monitoring IC EV/HEV powertrain HV-to-LV step-down converter BMS controller Traction battery BMS Automotive battery LV bus HV bus Auxiliary loads Isolated DC-DC converter Battery monitoring IC Battery monitoring IC EV/HEV powertrain Isolated DC-DC converter BMS controller Traction battery BMS Automotive battery Conventional BMS with passive balancing Proposed integrated BMS/DC-DC system SOC REGULATION DESIGN Bode plot of the inner current loop Proposed control approach for the integrated BMS-DC/DC architecture for electric vehicle applications TEAM Lead Institution Utah State University, PI: Dr. Regan Zane Team Institutions University of Colorado Boulder, PI: Dr. Dragan Maksimovic University of Colorado Colorado Springs, PI: Dr. Scott Trimboli National Renewable Energy Laboratory, PI: Dr. Kandler Smith Ford Motor Company, PI: Dyche Anderson REFERENCES 1. M. Evzelman, M. M. U. Rehman, K. Hathaway, R. Zane, D. Costinett, and D. Maksimović, “Active balancing system for electric vehicles with incorporated low voltage bus,” IEEE Trans. on Power Electronics, vol. 99, pp. 1-1, 2016. 2. M. M. U. Rehman, F. Zhang, R. Zane, and D. Maksimović, “Design and Control of an Integrated BMS/DC-DC System for Electric Vehicles,” COMPEL, 2016. BUS V OLTAGE REGULATION Bode plot of the outer voltage loop : PI compensator for voltage loop : to transfer function : close loop transfer function : current sensor gain : voltage sensor gain : PI compensator for SOC loop , : to transfer function for cell i In this work, the isolated DAB converter with phase-shift modulation control is used. The current regulation is designed at high speed ( = 10 kHz). SOC regulation for each cell is running in parallel with bus voltage regulation. The SOC regulation for each cell is designed at relatively low speed ( = 1 Hz) . Diagram of the outer voltage loop Bode plot of the outer SOC loop Diagram of the outer SOC loop The DC-DC modules are seen as a virtual DC-DC module in the design. The bus voltage regulation is designed at relatively high speed ( = 1 kHz) . Isolated dual-active-bridge (DAB) converter Project sponsored by ARPA-E AMPED program
Transcript of Design and Control of an Integrated BMS/DC-DC System for ... and...INTRODUCTION. Design and Control...
INTRODUCTION
Design and Control of an Integrated BMS/DC-DC System for Electric Vehicles
Fan Zhang2, M. Muneeb Ur Rehman1, Regan Zane1 and Dragan Maksimovic2
1Utah State University, 2University of Colorado Boulder
SELECT Annual Meeting and Technology Showcase – Logan, Utah – September 27-28, 2016
SYSTEM CONTROL APPROACH
Each DC-DC module, shown by the dotted blue boxes, has a local current feedback loop.
The central BMS controller, shown by the dotted orange box, incorporates the voltage compensator and delta SOC compensator that perform LV bus voltage 𝑣𝑣𝑏𝑏𝑏𝑏𝑏𝑏 regulation and cell balancing, respectively.
CONVERTER CURRENT REGULATION
In existing EVs, the battery balancing system and HV-to-LV DC-DC converter operate independently.
The proposed integrated BMS/DC-DC system can provide enhanced power capability and improved system efficiency by using the LV DC bus load to actively balance battery cells.
The proposed control strategy uses a combination of central and local controllers to reliably balance the combined requirements for cell state regulation, cell current protection, and bus voltage regulation.
LV bus
HV bus
Aux
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Bat
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ICB
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HV-to-LV step-down converter
BMS controller
Traction battery
BMS
Automotive battery
LV bus
HV bus
Aux
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IsolatedDC-DC
converter
Bat
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m
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ICB
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/HEV
po
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train
IsolatedDC-DC
converter
BMS controller
Traction battery
BMS
Automotive battery
Conventional BMS with passive balancing Proposed integrated BMS/DC-DC system
SOC REGULATION DESIGN
Bode plot of the inner current loop
Proposed control approach for the integrated BMS-DC/DC architecture for electric vehicle applications
TEAMLead InstitutionUtah State University, PI: Dr. Regan Zane
Team InstitutionsUniversity of Colorado Boulder, PI: Dr. Dragan MaksimovicUniversity of Colorado Colorado Springs, PI: Dr. Scott TrimboliNational Renewable Energy Laboratory, PI: Dr. Kandler SmithFord Motor Company, PI: Dyche Anderson
REFERENCES1. M. Evzelman, M. M. U. Rehman, K. Hathaway, R. Zane, D.
Costinett, and D. Maksimović, “Active balancing system for electric vehicles with incorporated low voltage bus,” IEEE Trans. on Power Electronics, vol. 99, pp. 1-1, 2016.
2. M. M. U. Rehman, F. Zhang, R. Zane, and D. Maksimović, “Design and Control of an Integrated BMS/DC-DC System for Electric Vehicles,” COMPEL, 2016.
BUS VOLTAGE REGULATION
Bode plot of the outer voltage loop
𝐺𝐺𝑐𝑐𝑐𝑐: PI compensator for voltage loop𝐺𝐺𝑐𝑐𝑣𝑣: 𝑖𝑖𝑣𝑣𝑖𝑖 to 𝑣𝑣𝑏𝑏𝑏𝑏𝑏𝑏 transfer function𝐺𝐺𝑣𝑣: 𝑖𝑖𝑣𝑣𝑖𝑖 close loop transfer function𝐻𝐻𝑣𝑣: current sensor gain𝐻𝐻𝑐𝑐: voltage sensor gain
𝐺𝐺𝑐𝑐𝑏𝑏𝑐𝑐𝑐𝑐: PI compensator for SOC loop𝐺𝐺𝑏𝑏𝑐𝑐𝑐𝑐,𝑣𝑣: 𝑖𝑖𝑣𝑣𝑖𝑖 to 𝑆𝑆𝑂𝑂𝑂𝑂 transfer function for cell i
In this work, the isolated DAB converter with phase-shift modulation control is used.
The current regulation is designed at high speed (𝑓𝑓𝑏𝑏𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠 = 10 kHz) .
SOC regulation for each cell is running in parallel with bus voltage regulation. The SOC regulation for each cell is designed at relatively low speed
(𝑓𝑓𝑏𝑏𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠 = 1 Hz) .
Diagram of the outer voltage loop
Bode plot of the outer SOC loopDiagram of the outer SOC loop
The DC-DC modules are seen as a virtual DC-DC module in the design. The bus voltage regulation is designed at relatively high speed (𝑓𝑓𝑏𝑏𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠 = 1 kHz)
.
Isolated dual-active-bridge (DAB) converter
Project sponsored by ARPA-E AMPED program
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