Method for reducing dynamic overvoltages in an alternating-curre

Details Method for reducing dynamic overvoltages in an alternating-curre Method for reducing dynamic overvoltages in an alternating-curre

1986-06-25

1987-08-25

Wong, Peter S.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 35, H02H 700

Patent

active

046897330

ABSTRACT:
Where different 3-phase systems are connected to each other via two static converters having an intermediate direct-current circuit, the exchange of power via the intermediate direct-current circuit can be interrupted by a severe disturbance, for example by failure of a static-converter or by line or busbar faults causing a short-circuiting of one of the static converters. This interruption means a change in the balance of effective power and, associated with this, a shedding of reactive load for the other undisturbed 3-phase system. To reduce high dynamic overvoltages which can lead to plant components being endangered or to operational disturbances, the firing angle of the static converter remaining in operation is regulated with dependence on the alternating voltage of the alternating-current system connected to this static converter, in such a manner that the overvoltage is reduced. This is carried out by regulating the current. The firing angle can be adjusted simultaneously with the short circuiting of the intermediate direct-current circuit by means of a short circuit device.

REFERENCES:
patent: 3628124 (1971-12-01), Johansson
patent: 3662250 (1972-05-01), Piccone et al.
patent: 3968419 (1976-07-01), Ekstrom

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