A POWER APPARATUS FOR A HIGH VOLTAGE ELECTRICAL POWER SYSTEM

摘要

The invention relates to a power apparatus (1) for a high voltage electrical power system (19), the power apparatus comprising a voltage source converter (2) and a high voltage dc power source (3) comprising one or more strings (4a, 4b, 4c) including a plurality of dc power source members (20a-e) connected in series, and switches (9), (11, 13) configured to connect and disconnect said strings, where said switches are solid-state switches, each string is subdivided into a plurality of dc power source units (8, 10, 12), each dc power source unit including a plurality of dc power source members connected in series and each dc power source unit is provided with one of said solid-state switches configured to connect and disconnect the dc power source unit, and that all solid-state switches in the string are arranged so that they are turned on and off simultaneously.