universal droop controller for inverters operated in parallel
TRANSCRIPT
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Universal Droop Controller for
Inverters Operated in Parallel
UKACC PhD Presentation Showcase
Yu Zeng
Supervisor: Prof. Qing-Chang Zhong
Control and Power Systems
Dept. of Automatic Control and Systems Engineering
The University of Sheffield
Control and Power Systems
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Univ logo UKACC PhD Presentation Showcase Slide 2/15
Outline
Background and motivation
The output impedance of the inverter
The universal droop controller
Simulation results
Conclusion and future work
Control and Power Systems
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What is an inverter?
Inverter
DC source AC output
www.xantrex.com www.theengineeringprojects.com www.victronenergy.com
Control and Power Systems
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Micro Grids
www.diytrade.com
www.marlec.co.uk
Wind Turbine
Solar Panel
Fuel Cell
Micro
Grids
AC
DC
Inverter
AC
DC
Inverter
AC
DC
Inverter
www.engadget.com
Utility Grid
AC Load
DC
AC
converter
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Parallel operation of inverters
Micro
Grids
AC
DC
Inverter 2
AC
DC
Inverter 3
AC
DC
Inverter 1
AC Load
10 kVA
S1*=4 kVA
S2*=6 kVA
S3*=10 kVA
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Parallel operation of inverters
Micro
Grids
AC
DC
Inverter 2
AC
DC
Inverter 3
AC
DC
Inverter 1
AC Load
10 kVA
S1*=4 kVA
S2*=6 kVA
S3*=10 kVA
S1=2 kVA
S1=3 kVA
S1=5 kVA
Power sharing
Without communication
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Univ logo Slide 5/15
Parallel operation of inverters
Micro
Grids
AC
DC
Inverter 2
AC
DC
Inverter 3
AC
DC
Inverter 1
AC Load
10 kVA
S1*=4 kVA
S2*=6 kVA
S3*=10 kVA
S1=2 kVA
S1=3 kVA
S1=5 kVA
Power sharing
Without communication
Droop Controller
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Control and Power Systems
Different types of output impedance
UKACC PhD Presentation Showcase Slide 6/15
Because of the filter inductor,
it is inductive
L-inverters
R-inverters C-inverters
PWM
i
L
IGBT
bridge
u C
+ - V DC
u f
AC bus
CB
vo
~ E
oZ 0oV
( rv ) ( ov )
oi
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Different droop controller forms
Inverters with inductive output impedance (L-inverters)
Inverters with capacitive output
impedance (C-inverters)
Inverters with resistive output
impedance (R-inverters)
i
Pi 0
*
Pi*
iii QnEE *
Ei
Qi 0
E*
Qi*
iii Pm *
Inductive Capacitive
Ei
Pi 0
E*
Pi*
iii PnEE *
i
Qi 0
*
Qi*
iii Qm *
Inductive Capacitive
i
Pi 0
*
Pi*
iii QnEE *
Ei
Qi 0
E*
Qi*
iii Pm *
Inductive Capacitive
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Parallel operation of L-, R-, C-inverters
Micro
Grids
AC
DC
R-Inverter
AC
DC
C-Inverter
AC
DC
L-Inverter
How to operate inverters with
different types of output
impedance in parallel?
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Parallel operation of L-, R-, C-inverters
Micro
Grids
AC
DC
R-Inverter
AC
DC
C-Inverter
AC
DC
L-Inverter
How to operate inverters with
different types of output
impedance in parallel?
Droop controller with the
same form
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Droop controller with the same form
UKACC PhD Presentation Showcase Slide 9/15
Control and Power Systems
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Droop controller with the same form
UKACC PhD Presentation Showcase Slide 9/15
Control and Power Systems
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Univ logo
Droop controller with the same form
UKACC PhD Presentation Showcase Slide 9/15
Control and Power Systems
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Univ logo
Droop controller with the same form
UKACC PhD Presentation Showcase Slide 9/15
Control and Power Systems
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Universal droop controller
UKACC PhD Presentation Showcase Slide 10/15
-
vri
s
1
*
vo
i
Ei
it+ i
Pi
Qi
ni
mi
eK -
E*
RMS
s
1
Control and Power Systems
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Simulation results (L&L, R&R)
UKACC PhD Presentation Showcase Slide 11/15
Reactive Power
Parallel operated L-inverters Parallel operated R-inverters
Active Power
Control and Power Systems
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Simulation results (C&C, L&R)
UKACC PhD Presentation Showcase Slide 12/15
Reactive Power
Parallel operated C-inverters Parallel operated L-and R-inverters
Active Power
Control and Power Systems
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Simulation results (L&C, R&C)
UKACC PhD Presentation Showcase Slide 13/15
Reactive Power
Active Power
Parallel operated L- and C-inverters Parallel operated R- and C-inverters
Control and Power Systems
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Conclusion and future work
Conclusion:
A universal droop controller that facilitates the parallel
operation of inverters with different types of output impedance
is presented.
It is with a E ∼ P and f ∼ Q droop.
Accurate load sharing can be achieved.
Future Work: Improvement on universal droop controller.
Control and Power Systems
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EPSRC Grant EP/J01558X/1 on Developing Fundamental
Theory and Enabling Technologies for Parallel Operation of
Inverters to Facilitate Large-scale Utilisation of Renewable
Energy.
EPSRC Grant EP/J001333/2 on International Collaboration
Sabbatical: To Foster Long term Collaboration with Leading
Control and Power Electronics Experts in the USA.
Industrial Advisory Board Members:
UKACC PhD Presentation Showcase Slide15/15
Acknowledgement
Control and Power Systems