| 摘要 |
A method for controlling a static converter connected to a direct-current source. The converter has power conductor switches that can be deactivated and is configured to supply a distribution network with three-phase voltage. The currents flowing through the respective power semiconductor switches are measured, current values respectively assigned to the power semiconductor switches are obtained, the current values are sampled and digitized to obtain digital current values. The latter are checked by a logic in a control unit for the presence of an excess current condition. If no excess current condition is detected, the power semiconductor switches are activated and deactivated with the aid of a nominal operation controller and if an excess current condition is detected, at least the power semiconductor switches with assigned digital current values that fulfill the excess current condition are deactivated after a pulse block has expired. For the digital current values that fulfill the excess current condition, all power semiconductor switches, which are connected to the positive direct-current terminal, are activated and all power semiconductor switches, which are connected to the negative direct-current terminal are deactivated or vice versa. For the digital current values that do not fulfill the excess current condition, the power semiconductor switches are controlled once again by the nominal operation controller. |
