CONTROL METHOD AND SYSTEM FOR IMPROVING TRANSIENT STABILITY AREA OF GRID-CONNECTED INVERTER
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United States of America
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Issued Date -
Jan 30, 2025
app pub date -
Nov 6, 2023
filing date -
Nov 6, 2023
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status (Latency Note)
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Abstract
The invention discloses a control method and system for improving a transient stability area of a grid-connected inverter. It includes performing park coordinate transformation on a three-phase voltage and a three-phase output current of a connection point of a grid-connected inverter to obtain an actual voltage input value and an actual current input value required for current control; obtaining the grid-connected voltage phase through phase-locked loop processing; generating, by the power control module, the current command value required by the current control module; using the sliding mode current control method, by the current control module, to generate a dq voltage signal, and obtaining PWM modulated voltage control signals through inverse park transformation; using a LCL filter to filter out high-order harmonics to achieve grid-connected control. The present invention effectively improves the transient stability of the grid-connected inverter by using the sliding mode control method in the current controller.
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