Control method for a system comprising a frequency converter connected to a power grid
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United States of America Patent
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Aug 18, 2020
Grant Date -
Dec 7, 2017
app pub date -
Feb 2, 2015
filing date -
Feb 2, 2015
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Abstract
A method which is suitable for a system having a frequency converter and a generator, both of which are connected to a power grid, includes obtaining sub-synchronous components of the grid voltage and determining damping current set points according to the sub-synchronous components to compensate for sub-synchronous resonances of the grid. Damping current set points are determined by receiving the sub-synchronous components of the grid voltage and returning damping current set points as outputs. A variable damping gain is adjusted according to the sub-synchronous frequency of the grid, such that the required compensation level can be adapted to the frequency converter for damping sub-synchronous resonance of the grid.
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