| 摘要 |
The invention relates to a power conversion device, comprising a phase terminal (8), at least one bus terminal (10), at least one branch module (11) arranged in between the phase terminal (8) and the bus terminal (10), and a control module (15), whereby each branch module (11) comprises at least a voltage-source converter valve (1, 2), the branch module (11) further comprises a branch reactor (12) connected in series with the voltage-source converter valve (1, 2) and/or the power conversion device comprises a phase reactor (14) connected in series between the phase terminal (8) and the branch module (11), and the control module (15) is adapted for measuring a branch di/dt (16) over the branch reactor (12) and/or a phase di/dt (17) over the phase reactor (14), generating a turn-off signal if the measured branch di/dt (16) and/or the measured phase di/dt (17) has exceeded a pre-defined threshold value, and, in response to the turn-off signal, turning-off at least one voltage-source converter valve (1, 2). |
