Static and dynamic mains voltage support by a static power factor correction device having a self-commutated converter
First Claim
1. A method for static and dynamic support of a mains voltage at a network node, which comprises:
- providing a static power factor correction device with a transformer and a self-commutated converter with at least one capacitive energy store;
continuously determining reference values as a function of deviations between a magnitude of a mains voltage space vector at the network node and a predetermined magnitude reference value of the mains voltage space vector;
producing a phase angle as a function of deviations between an actual value and the reference values, the phase angle indicating an instantaneous phase shift of a generated voltage-space vector of the self-commutated converter with respect to a measured mains voltage space vector;
determining from the phase angle an angular position of the mains voltage space vector of the self-commutated converter as a function of the angular position of the voltage space vector; and
selecting, based on the angular position of the mains voltage space vector of the self-commutated converter, associated switching state signals for the self-commutated converter through predetermined optimized pulse patterns.
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Abstract
A mains voltage at a network node is statically and dynamically supported with a static power factor correction device which has a transformer and a self-commutated converter with at least one capacitive energy store. Instantaneous reference setpoint values for an underlying, secondary instantaneous control method are continuously determined as a function of determined voltage magnitude deviation of the mains voltage at the network node. The secondary instantaneous control method determines a phase angle as a function of determined instantaneous actual values. The phase angle defines the angle of the converter voltage space vector of the self-commutated converter as a function of the angle of the mains voltage space vector. This results in dynamic regulation of the reactive powers required for mains voltage regulation.
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Citations
11 Claims
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1. A method for static and dynamic support of a mains voltage at a network node, which comprises:
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providing a static power factor correction device with a transformer and a self-commutated converter with at least one capacitive energy store; continuously determining reference values as a function of deviations between a magnitude of a mains voltage space vector at the network node and a predetermined magnitude reference value of the mains voltage space vector; producing a phase angle as a function of deviations between an actual value and the reference values, the phase angle indicating an instantaneous phase shift of a generated voltage-space vector of the self-commutated converter with respect to a measured mains voltage space vector; determining from the phase angle an angular position of the mains voltage space vector of the self-commutated converter as a function of the angular position of the voltage space vector; and selecting, based on the angular position of the mains voltage space vector of the self-commutated converter, associated switching state signals for the self-commutated converter through predetermined optimized pulse patterns. - View Dependent Claims (2, 3, 4, 5)
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6. An apparatus for static and dynamic support of a mains voltage at a network node, in combination with a static power factor correction device having a transformer and a self-commutated converter with at least one capacitive energy store, the apparatus comprising:
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a voltage control loop with an instantaneous control loop; a drive element for driving the self-commutated converter of the static power factor correction device; a subtractor having a first input receiving an angle value of a determined mains voltage space vector at the network node, a second input, and an output connected to said drive element; said instantaneous control loop having an output connected to said second input of said subtractor. - View Dependent Claims (7, 8, 9, 10, 11)
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Specification