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Smart Microgeneration Inverters
WISE/SISE - Wind/Solar Integration in Smart Environments
Carlos Moreira
INESC TEC – INESC Technology and Science (formerly INESC Porto)
The change of paradigm - challenges
2
Ch
argi
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C
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Power
Reduce load
Reduce load
Max
.
Min
.
Power
Increase load
Increase load
Microgeneration inverters with grid supporting functionalities
3
Voltage control in LV distribution grids
Microgeneration units locally controlled through active power – voltage droop:
Provide voltage support to the LV network due to low X/R ratio.
Avoids microgeneration overvoltage tripping.
Main implications:
Renewable energy spillage
Reduction in the remuneration
A new solution: Combining microgeneration units and energy storage
Pmax
Deadband
P
ΔV
Pref
ΔV maxΔV min
Main Architecture
4
5
DC/AC microgeneration prototypes: single phase units incorporating grid support functionalities,
bidirectional communication, remotely parameterized and monitored
Solar DC/AC inverter prototype
Wind DC/AC inverter prototype
Microgeneration inverters with grid supporting functionalities Actual Stage
Main Features
6
Full scale controllable power flow with low harmonic content Possibility of including a local battery for energy storage Autonomous management of battery charging and discharging Computer diagnosis and monitoring software Advanced interface for integration in smart grid environments
Fault ride through capability
