Exercise 1

Question 1

Can CPLs be dangerous for the grid? Why?

Answer 1

Change in damping characteristics of grid

Oscillations can lead to instability

Question 2

How does the use of instantaneous power quantities in the Park domain simplify the analysis of 3-phase power systems?

Answer 2

Solution: it simplifies the representation of the steady-state behavior by mapping 3 vectors which rotate in the phase space at the nominal network frequency to 2 vectors OR (effectively it maps AC to DC, enabling simplified analysis).

Question 3

. Under what conditions do the instantaneous power quantities (Active power and reactive power in the Park domain) equal the steady-state active or reactive
power in a 3-phase system?

Answer 3

Solution: If the system is symmetric AND balanced AND there are no harmonics (0.5 x 3 point).

Question 4

Park transformation matrix