Back-up energy storage with in-rush current limiting for wind turbine pitch drive
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United States of America Patent
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Oct 17, 2017
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N/A
app pub date -
Jul 1, 2014
filing date -
Jul 5, 2013
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Abstract
A wind turbine pitch drive system comprises an electric grid for supplying electrical power, a motor for driving a pitch actuator, an electronic converter for controlling the motor and a back-up energy storage unit for supplying electrical power. The electronic converter comprises a DC-link capacitor bank. The system furthermore comprises a switching device for selectively connecting the DC-capacitor bank link to the back-up energy storage unit, and a frequency generator for controlling the switching device. Also disclosed is a method for protecting a component of the electronic converter.
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