Netzgekoppelter Wechselrichter und Überspannungsunterdrückungsverfahren dafür

Details

Veröffentlichungs-Nr.

EP4712287

Anmeldetag

18. Mai 2023

Veröffentlichung

14. November 2024

Rechtsraum

EP

IPC

H02J3/16, H02J3/00

Abstract

Provided in the present application are a grid-connected inverter and an overvoltage suppression method therefor. In the overvoltage suppression method, when an alternating-current port voltage of a grid-connected inverter does not exceed a preset threshold value, the grid-connected inverter is controlled to perform grid-connected operation in a current source mode; when the alternating-current port voltage exceeds the preset threshold value, the grid-connected inverter is controlled to perform grid-connected operation in a voltage source mode, such that a response to a reactive current or reactive power, which is outputted by an alternating-current port of the grid-connected inverter, is realized within a preset duration; and the grid-connected inverter is controlled to resume the current source mode until the reactive current or the reactive power is greater than or equal to a corresponding preset reactive instruction value. Therefore, when a temporary overvoltage occurs in an electric power system, transient voltage source characteristics are constructed, and a power supply characteristic of a grid-connected inverter is used to enable the grid-connected inverter to perform spontaneous reactive injection, so as to greatly reduce a reactive response time so that same is synchronous with a rising speed of an alternating-current port voltage, that is, an instantaneous reactive power support can be achieved, and rapid suppression of an instantaneous overvoltage can thus be achieved.

Anmelder

Firma

Sungrow Power Supply Co., Ltd.

Land

🇨🇳 China

Fachgebiete