Electrical converter equipment having reduced harmonic circuits
AssigneeASEA Aktiebolag
InventorLennart Sandberg
Life of this patent
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Abstract
A static electrical converter equipment has a plurality of controllable converter bridges connected to a common a.c. supply source. Control pulse devices supply control pulses to the controllable valves of the bridges. The converter equipment comprises members arranged to prevent a control pulse from being supplied to a valve in one of the bridges, for initiating a commutation in this bridge, until a corresponding commutation in another bridge is completed.
Claims5
An electrical converter equipment comprising at least two converter bridges with controllable valves connected to the same a.c. network, and control means which delivers control pulses to the controllable valves of the bridges, said control means including means for preventing a control pulse from being delivered to a controllable valve in a first of said bridges until a commutation in a second of said bridges, occurring during the same half-period of the alternating voltage of said network, is completed.
A converter equipment according to any of the preceding claims, comprising two converter bridges connected in series on their d.c. sides, in which, upon an increase of the direct voltage of the converter from its lowest value, the direct voltage of said second bridge is first increased to its maximum value and thereafter the direct voltage of said first bridge is increased from its lowermost value to its maximum value.
Dependencies are inferred from the claim text.