25-06-2014, 03:36 PM
Power electronic interfaces
Power electronic interfaces.ppt (Size: 1.35 MB / Downloads: 131)
Power electronic converters provide the necessary adaptation functions to integrate all different microgrid components into a common system.
Integration needs:
Component with different characteristics:
dc or ac architecture.
Sources, loads, and energy storage devices output.
Control issues:
Stabilization
Operational issues:
Optimization based on some goal
Efficiency (e.g. MPPT)
Flexibility
Reliability
Safety
Other issues:
Interaction with other systems (e.g. the main grid)
Capacitors:
state variable: voltage
Fundamental circuit equation:
The capacitance gives an indication of electric inertia. Compare the above equation with Newton’s
Capacitors will tend to hold its voltage fixed.
For a finite current with an infinite capacitance, the voltage must be constant. Hence, capacitors tend to behave like voltage sources (the larger the capacitance, the closer they resemble a voltage source)
A capacitor’s energy is