| 摘要 |
The invention relates to a submodule (1) for a modular multipoint converter with an energy store (C0); a semiconductor series circuit (2) which is connected in parallel to the energy store (C0) and which consists of two power semiconductor switches (T1, T2) that can be switched on and off, a freewheeling diode (D1, D2) being connected in parallel to each power semiconductor switch in the opposite direction; a first connection terminal (X1) which is connected to the potential point between the power semiconductor switches (T1, T2); a second connection terminal (X2); and a snubber network that has a current limiting inductor (L1) and a demagnetizing branch (3) which bridges said inductor, in which two snubber diodes (Ds1, Ds2) are arranged in series in the same direction, and in which a snubber resistor (Rs2) is arranged. The semiconductor series circuit (2) is connected to the energy store (C0) via the current limiting inductor (L1), and the potential point between the snubber diodes (Ds1, Ds2) is connected to the potential point between the power semiconductor switches (T1, T2) via a snubber condenser (Cs). The aim of the invention is to provide such a submodule which leads to a reliable operation with as low a loss as possible and which is inexpensive. This is achieved in that the snubber network does not have any additional components, or each additional snubber component of the snubber network is arranged in a mesh which is partly formed from the demagnetizing branch (3) or portions thereof. |
