Grid-connected inverter and control method and controller thereof

By detecting the voltage change characteristics at the output port of the grid-connected inverter, it is determined whether the inverter is in a weak grid environment. When the environment is determined to be weak, its output capacitive reactive power is controlled, which solves the problems of insufficient stability and active power output capability of the grid-connected inverter under weak grid conditions, and improves both stability and active power output capability.

CN122178737APending Publication Date: 2026-06-09SUNGROW POWER SUPPLY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SUNGROW POWER SUPPLY CO LTD
Filing Date
2026-01-27
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

Grid-connected inverters have poor stability under weak grid conditions and low active power output capability.

Method used

By detecting the voltage change characteristics at the output port of the grid-connected inverter, it can be determined whether the grid environment is weak. If the grid environment is weak, the output of capacitive reactive power of the grid-connected inverter can be controlled to improve the active power output capability.

Benefits of technology

It improves the active power output capability of grid-connected inverters under weak grid conditions, enhances their stability, and avoids downtime due to loss of static operating point.

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Abstract

The application provides a grid-connected inverter and a control method and controller thereof, and relates to the technical field of inverter control. The method comprises the following steps: detecting the variation characteristics of the output port voltage of the grid-connected inverter; judging whether the grid-connected inverter is in a weak power grid environment based on the variation characteristics; and controlling the grid-connected inverter to output capacitive reactive power to improve the active power output capability of the grid-connected inverter in the case that the grid-connected inverter is in the weak power grid environment. The application can solve the problem of poor stability of the grid-connected inverter in a weak power grid.
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