Weak power grid full load test method and system of double sampling closed loop frequency converter based on SVG reactive compensation and orthogonal decomposition
By adopting a dual-sampling closed-loop control method based on SVG reactive power compensation and orthogonal decomposition, the problem of inductive reactive current that cannot be eliminated in the full-load test of high-voltage high-power frequency converters is solved, and stable testing and dynamic compensation are realized in weak grid environment, thereby improving the anti-disturbance capability and operational stability of the test system.
Patent Information
- Application Number
- CN202610864663.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-06-16
- Publication Date
- 2026-07-17
AI Technical Summary
Existing technologies cannot effectively eliminate inductive reactive current during full-load testing of high-voltage, high-power frequency converters. This leads to the test system being prone to coupled oscillations and grid voltage fluctuations in weak grid environments. Furthermore, dynamic reactive power compensation cannot be achieved, making it difficult to meet the stability testing requirements of ultra-high-power frequency converters.
A dual-sampling closed-loop control method based on SVG reactive power compensation and orthogonal decomposition is adopted. By setting sampling points at the output end of the frequency converter and the input end of the grid, an equivalent control model is established. The frequency converter is decomposed into a static var generator and a grid-connected inverter, realizing the orthogonal decomposition and dual closed-loop control of active and reactive currents, and dynamically compensating for inductive reactive power.
Stable full-load testing of the frequency converter was achieved in a weak power grid environment, eliminating reactive power disturbances, improving anti-disturbance capability and long-term operational stability, and ensuring the safety performance verification of the frequency converter under harsh power grid conditions.
Smart Images
Figure CN122410187A_ABST