Direct-start of the Flexible Power Conditioner with Back-to-back Converters

The multi-functional flexible power conditioner (FPC), which can be considered as a doubly-fed induction machine (DFIM) with a flywheel, is a new kind of Flexible AC Transmission Systems (FACTS) equipment. It can regulate active power rapidly to enhance power system stability and forestall many power system faults. For the special needs of the start process of FPC, a novel direct-start control strategy, which includes some treatments to the speed control system of the rotor-side of back-to-back converters, is proposed in this paper. Detailed analysis of this strategy and experimental result show that it can effectively avoid the start impulsion to the equipment and power system and restraint the power flowed between them.