A variable frequency transformer fault ride-through control method and related device for comprehensive regulation of grid voltage

By collecting and analyzing grid voltage, stator winding parameters, etc. to generate three-phase converter control signals, the problems of high material consumption and complex operation of multiple converters in the existing technology are solved, and simple and efficient fault ride-through control is achieved.

CN119742859BActive Publication Date: 2025-09-12FOSHAN POWER SUPPLY BUREAU GUANGDONG POWER GRID
2 Cites 0 Cited by

Patent Information

Application Number
CN202510246173.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-03-04
Publication Date
2025-09-12
Estimated Expiration
2045-03-04

AI Technical Summary

Technical Problem

The existing technology requires at least two three-phase converters to stabilize the DC capacitor voltage and solve the problems of unbalanced grid voltage and harmonic distortion on both sides of the variable frequency transformer, resulting in high consumables costs and complex operations.

Method used

A variable frequency transformer fault ride-through control method with comprehensive grid voltage regulation is adopted. By collecting grid voltage, stator winding parameters and three-phase converter parameters, analyzing and processing them, a control signal of the three-phase converter is generated to achieve fault ride-through control.

Benefits of technology

Only one three-phase converter is needed to solve the problems of grid voltage imbalance and harmonic distortion, reducing circuit complexity and consumables costs and improving control efficiency.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

This application relates to the field of power grid control and discloses a variable frequency transformer fault ride-through control method and related device for comprehensively regulating power grid voltage. The method is applied to a fault ride-through circuit, collects stator winding parameters, three-phase converter parameters, capacitor voltage, and rotor phase angle; calculates stator winding reactive power, three-phase converter positive-sequence current, and stator winding DC component based on the collected parameters; analyzes the data based on the voltage control equation to obtain the DC component of the three-phase converter's positive and negative sequence voltage reference values ​​and odd harmonic voltage reference values; analyzes the DC component of the three-phase converter's positive and negative sequence voltage reference values ​​and the three-phase converter's odd harmonic voltage reference values ​​based on the grid voltage phase angle and rotor phase angle to obtain the three-phase converter voltage vector reference value; and performs space vector modulation on the voltage vector reference value. This method addresses the current technical problem of requiring at least two three-phase converters to achieve voltage imbalance and harmonic distortion fault ride-through control, which results in high material consumption and complex operation.
Need to check novelty before this filing date? Find Prior Art