Switch-off method for a three-phase reactive power compensator with two thyristor switches
AssigneeSiemens Aktiengesellschaft
InventorsHeinz Tyll, Frank Schettler
Life of this patent
Estimating the term…
Abstract
A switch-off method for a three-phase solid state reactive power compensator for a rotary three phase power system has first and second thyristor valves receiving respective first and second firing signals, and three capacitors. The firing signals are suppressed to a point in time for first turning off the second firing thyristor valve in immediately successive phases in direction of rotation of the three-phase power system.
Claims7
A method for switching-off a three-phase reactive-power controller of a static reactive power compensator, which comprises:
- providing a reactive-power controller of a three-phase system with three capacitors and a first and second thyristor valve respectively associated with a leading and lagging one of two of three phases;
- suppressing firing signals of the first and second thyristor valves such that the second thyristor valve is always switched off before the first thyristor valve.
A method for switching-off a three-phase reactive-power controller of a static reactive power compensator, which comprises:
- providing a reactive-power controller having two thyristor valves switched with firing signals and three capacitors;
- and
- suppressing the firing signals of the two thyristor valves at a time instant in such a way that the thyristor valve which is second of the two thyristor valves in a sense of rotation of the three-phase system is turned off first.
A control device for controlling a three-phase reactive power controller of a static compensator, the reactive power controller having three capacitors and a first and second thyristor valve respectively associated with a leading and a lagging one of two of three phases of the three-phase system, the control device comprising a delay device connected to the first and second thyristor valves for switching off the second thyristor valve prior to the first thyristor valve.
Dependencies are inferred from the claim text.