Feed-forward control method for enhancing system stability and filtering high-order background harmonics of power grid

The invention discloses a feedforward control method for enhancing system stability and filtering high-order background harmonics of a power grid, comprising an LCL topological structure and a control loop, and the control loop is connected with a decoupling item and a capacitive current feedback ac...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: JIN SICONG, LI YUZE, ZHANG XIN
Format: Patent
Sprache:chi ; eng
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Beschreibung
Zusammenfassung:The invention discloses a feedforward control method for enhancing system stability and filtering high-order background harmonics of a power grid, comprising an LCL topological structure and a control loop, and the control loop is connected with a decoupling item and a capacitive current feedback active damper; the feedforward control method comprises the following steps: collecting a grid-connected current, a common coupling point voltage and a capacitance current; obtaining a voltage phase angle of the common coupling point voltage through a phase-locked loop, and converting the grid-connected current, the common coupling point voltage and the capacitance current into a dq axis through the voltage phase angle; the angle difference exists between the dq axis of the system and the dq axis of the control loop; a full feed-forward strategy is adopted for power grid d-axis voltage feed-forward, a full feed-forward strategy is adopted for power grid q-axis voltage feed-forward, duty ratio signals of a control sys