A grid-connected inverter fault ride-through composite compensation control method and system

CN117713224BActive Publication Date: 2026-06-26SHANDONG UNIV
View PDF 2 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHANDONG UNIV
Filing Date
2023-12-13
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

When the grid voltage drops, the grid-connected inverter controlled by the virtual synchronous generator cannot respond quickly to active and reactive power, and there is a transient overcurrent problem, which affects the stability of the system.

Method used

A composite compensation control method combining power angle feedforward, voltage feedforward, and transient virtual resistance is adopted. By activating power angle feedforward and voltage feedforward during low voltage ride-through, combined with transient virtual resistance, the response speed is improved and transient inrush current is suppressed.

Benefits of technology

During grid voltage dips, the response speed of the grid-connected inverter to active and reactive power is significantly improved, transient inrush current is reduced, and the safe and stable operation of the system is ensured.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN117713224B_ABST
    Figure CN117713224B_ABST
Patent Text Reader

Abstract

The application provides a grid-connected inverter fault ride-through composite compensation control method and system, acquires a grid-connected point voltage amplitude, when the grid-connected point voltage amplitude is less than or equal to a set value, starts low voltage ride-through control; after starting the low voltage ride-through control, feeds forward an active power angle in an active ring, feeds forward a voltage in a reactive ring, and feeds forward a transient virtual resistance in a virtual impedance part; after the grid voltage returns to a normal range, the voltage feed forward is exited, a timer is started, whether the system enters a steady state is judged after the timer ends, whether the compensation value of the power angle feed forward is greater than a set value is judged after the system enters the steady state, if the compensation value is greater than the set value, power angle smoothing is exited, otherwise, the power angle feed forward part is exited, the system exits the low voltage ride-through mode, and returns to a normal working mode. The application introduces the power angle feed forward, the voltage feed forward and the transient virtual resistance, accelerates the response speed of the output power during the low voltage ride-through, simultaneously suppresses the transient impact current, and guarantees the safe operation of equipment.
Need to check novelty before this filing date? Find Prior Art