Grid Direct-current Flexible Loop Closing Control Device and Method
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United States of America Patent
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Issued Date -
Jan 23, 2025
app pub date -
Nov 8, 2022
filing date -
Nov 8, 2022
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Abstract
A grid direct-current flexible loop closing control device is a series-parallel device and includes a series coupling unit, a parallel coupling unit, a bypass switch circuit, and a loop closing main controller. The series-parallel devices is connected in series between each distribution line and a load, and after a loop closing instruction is received, the loop closing control devices are set to work in a voltage control mode; after direct-current bus voltages of two loop closing control devices are identical, a system enters a loop closing state. Before exiting loop closing, the loop closing control devices are set to be in a PQ control mode, access switches are sequentially turned off after P and Q are gradually decreased to zero, and a loop closing process is ended. The device is simple in structure, low in cost and high in efficiency, and has fewer loop-closing monitoring quantities.
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