| 摘要 |
Apparatus and method for limiting current in a direct voltage network of a HVDC power distribution system. A direct voltage network is connected to an alternating voltage network through a VSC-converter. At least one parallel connection including a semiconductor switching element is connected in series with the direct volta ge network. A surge diverter is connected in parallel with the semiconductor switching element. During a high current condition in the direct voltage network, the switching element is switched off interrupting the current flow which is then diverted through th e surge diverter which reduces the current flowing in the direct voltage network. By insertin g a plurality of parallel connections, and selectively turning off a number of said semiconductor switching elements, a number of different levels of over current conditions in said direct voltage network may be controlled.
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