Table 1 Converter parameters and operation conditions

Rated ac voltage

220 kV

Line-to-line

Equivalent impedance of ac source

0.116Ω + j0.0091H

Transformer ratio

220/167 kV

Transformer leakage reactance

0.15 p.u.

Power rating of MMC

500MVA

Rated dc voltage

320 kV

Number of SMs in one arm

200

Redundancy ignored

Arm inductance

0.6H

0.06H, When 500Hz

SM capacitance

10000 μF

1000 μF, when 500Hz

Rated voltage of SM

1.6 kV

Smoothing reactor

50 mH

Grounded resistance

0.29Ω

IGBT module

5SNA 1200E250100

\( \begin{array}{l}{U}_{ce}=2500V\\ {}{I}_c=1200A\end{array} \)