초록 ▼

A synchronous condenser is provided on an AC bus line which is connected to an AC power system via a circuit breaker. The AC bus line and a DC bus line are connected via a power converter system. In such a system, if three conditions: the breaker is opened; the synchronous condenser is under operati

A synchronous condenser is provided on an AC bus line which is connected to an AC power system via a circuit breaker. The AC bus line and a DC bus line are connected via a power converter system. In such a system, if three conditions: the breaker is opened; the synchronous condenser is under operation; and the power converter operates as an inverter, are met, the power converter is driven into a zero power factor operation, i.e., an operation to cancel a capacitive reactive power on the AC bus line including AC filters in order to prevent the synchronous condenser self-excitation.

대표청구항 ▼

A method for operating a power converter connected between a DC bus line and an AC bus line, said AC bus line provided with a synchronous condenser and connected to an AC power system through a breaker, comprising the steps of: detecting whether or not said breaker is opened; detecting whether or no

A method for operating a power converter connected between a DC bus line and an AC bus line, said AC bus line provided with a synchronous condenser and connected to an AC power system through a breaker, comprising the steps of: detecting whether or not said breaker is opened; detecting whether or not said synchronous condenser is under operation; detecting whether or not said power converter works as inverter; and driving said power converter at a firing angle cancelling a capacitive reactive power of said AC bus line when said breaker is opened, said synchronous condenser is under operation, and said power converter works as inverter. A system for operating a power converter connected between a DC bus line and an AC bus line, said AC bus line provided with a synchronous condenser and connected to an AC power system through a breaker, comprising: first means for generating a second signal while said breaker is opened; second means for generating a second signal while said synchronous condenser is under operation; third means for generating a third signal while said power converter works as inverter; and control means for driving said power converter at a predetermined firing angle upon reception of said first, second and third signals thereby consuming on said AC bus line a reactive power sufficient for cancelling a capacitive reactive power of said AC bus line.