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Table 2 Low voltage ride through variables of voltage symmetric sag

From: A novel low voltage ride through strategy for cascaded power electronic transformer

 

Variable

Rectified state

Inverter state

Before voltage sag

\( {P}^{\ast}\left({i}_{d0}^{\ast}\right) \)

0.375

− 0.375

\( {Q}^{\ast}\left({i}_{q0}^{\ast}\right) \)

0

0

P 0

0.375

− 0.375

Q 0

0

0

After voltage sag α = 0.4

\( {i}_d^{\ast } \)

0.937

− 0.937

\( {i}_q^{\ast } \)

0.75

0.75

P

0.375

− 0.375

Q

−0.3

− 0.3