A SYSTEM FOR TRANSMITTING ELECTRIC POWER

摘要

A system for transmitting power over a direct voltage network. A first power station connects one alternating voltage network to the direct voltage network. The first power station includes a converter for bidirectionally transferring power between the direct voltage network and the alternating voltage network. The converter maintains constant value of voltage on the network, or operates in a second alternative mode of controlling constant current between the alternating voltage network and the direct volt age network. When the voltage on the direct voltage network drops below a reference value , a second power station connected to the direct voltage network and to a remaining alt ernating voltage network takes over the voltage regulation function. The second power station prior to taking over the voltage regulating function was in a current regula ting function. In this way, when the first station reaches its limits of voltage regulation , the second station is enabled to take over the voltage regulating function switching ou t of a current regulating function.