System for bridging brief network failures
AssigneeSiemens Aktiengesellschaft
InventorsDietrich Krampe, Hans-Peter Schneider, Hans-Hermann Zander
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Abstract
An arrangement for bridging brief network failures in intermediate-link converters converts the kinetic energy in load motors into electrical energy by reducing the frequency of the converter. Such a frequency reduction is performed in accordance with the value of a control deviation signal corresponding to the difference between desired and actual frequencies of operation of the converter. The control deviation signal is produced by the combination of a PI controller which is coupled at its output to an integrator circuit. The integrator circuit controls the frequency and voltage of the converter.
Claims4
An arrangement for bridging a network failure, the arrangement being of the type wherein kinetic energy in load motors is reconverted into electrical energy by lowering the frequency of operation of a converter, the arrangement comprising:
- controller means having an input for receiving a first voltage signal corresponding to the difference between desired and actual voltage values of the converter;
- and
- frequency converter means connected to said controller means for producing a frequency correction signal for lowering the frequency of operation and said associated desired voltage value of the converter whereby the load motors operate oversynchronously as generators to supply electrical energy to the converter during the network failure.
Dependencies are inferred from the claim text.