Method and system for grid-connected converter synchronization fault prevention with recovery
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United States of America Patent
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Jul 30, 2019
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N/A
app pub date -
Oct 16, 2018
filing date -
Oct 16, 2018
priority date (Note) -
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Abstract
A method and system of controlling a power converter coupled between one of a motor drive inverter and a grid-tie inverter within an electric grid. The method comprises operating the power converter in a first PLL control mode that establishes a state of synchronization with the electric grid, detecting a grid disturbance voltage dip event; keeping the power converter synchronized and preserving charge of a set of dc-link capacitors, switching from the first PLL control mode to a second PLL control mode of operation of the power converter to obtain fast re-synchronization after dip period ends, and reverting to operation in the first PLL control mode upon re-establishing of the state of synchronization.
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