Power Electronics in New and Renewable Energy Systems Mohammad A. Abusara Lecturer in control and...
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Power Electronics in New and Renewable Energy Systems Mohammad A. Abusara Lecturer in control and Power Electronics Renewable Energy Research Group College
Power Electronics in New and Renewable Energy Systems Mohammad
A. Abusara Lecturer in control and Power Electronics Renewable
Energy Research Group College of Engineering, Mathematics, and
Physical Sciences
Slide 2
Outline Microgrid Grid Connected Interleaved Inverter Exhaust
Heat Energy Recovery Systems Marine Renewable Energy
Slide 3
Microgrid System
Slide 4
35kWHr lithium-ion batteries (60kVA Inverter) 100kW micro Gas
Turbine
Slide 5
MicroGrid: Controller Structure
Slide 6
Microgrid Challenges and Features Challenges Maintain stability
during connection, disconnection, load application/shedding Good
Load sharing in island mode Good current quality in grid-connected
mode Features Seamless transfer from grid-connected mode to island
mode and vice versa Improved current quality Improved transient
response
Slide 7
Microgrid-Practical Test
Slide 8
Microgrid-Practical Results
Slide 9
The effect of virtual impedance on improving current THD
Slide 10
Grid Connected Interleaved Inverter
Slide 11
Interleaved Concept One channel is replaced by a number of
channels connected in parallel Switching instants are phase shifted
equally over a switching period Introduced for telecommunication
power supplies (low voltage high current)
Slide 12
Interleaved Inverter- Advantages Smaller Power Switches Smaller
capacitors Smaller Inductor
Slide 13
Novel DC/AC Grid Connected Interleaved Inverter Advantages over
2-level topology Smaller C and hence so high output impedance to
voltage harmonics (better current THD) No need for a second L
Smaller in size
Slide 14
Controller Structure
Slide 15
System Modelling
Slide 16
Passive Damping For active damping Sampling frequency (35kHz)
is only 1.47 to 3.2 times the natural resonance frequency Passive
damping is possible (small capacitor current thanks to interleaved
topology)
Slide 17
Passive Damping R Root locus, R = 0 ohmRoot locus, R = 0.5 ohm
The varying parameter in the Root Locus is the grid impedance
Slide 18
Controller Design Phase Lag Controller Proportional Controller
K(z) =10
Slide 19
Robust Digital Controller Immunity to Grid Impedance Variations
Excellent Current Quality (THD=2.3%)
Slide 20
Interleaved Grid Connected Inverter
Slide 21
Exhaust Heat Energy Recovery Systems
Slide 22
Energy Recovery System Although it is a dominant prime mover
and one of the most efficient power sources, a typical modern
turbocharged Diesel engine still wastes significant amounts of fuel
energy. The exhaust waste heat energy can be recovered and
converted into useful electrical power
Slide 23
Components of Exhaust Recovery System Fuel Saving 5-7% Power
Boost 10-15% Turbine + High speed alternatorPower Electronics
Slide 24
Exhaust Energy Recovery
Slide 25
Organic Rankin Cycle (ORC) System
Slide 26
ORC System Diagram
Slide 27
ORC Optimisation
Slide 28
Customers On road trucks Off road vehicleStationary power
plants