一种基于动态带宽控制的构网型变流器低电压穿越方法
By dynamically adjusting the virtual impedance and active-frequency control loop proportional coefficient through dynamic bandwidth control and hierarchical timing strategy, the current saturation problem of traditional adaptive virtual impedance under deep voltage drop is solved, improving the stability of grid-type converters and the reliability of power systems, and realizing rapid voltage recovery and synchronization resynchronization.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- INNER MONGOLIA UNIV OF TECH
- Filing Date
- 2026-04-17
- Publication Date
- 2026-07-17
AI Technical Summary
When faced with deep voltage drops, traditional adaptive virtual impedance technology can cause the converter to easily enter current saturation, resulting in uncontrolled power output, distorted output voltage waveform, slow recovery speed after fault clearing, decreased synchronization stability, and a tendency to trigger inrush current, which affects system stability.
A dynamic bandwidth control method is adopted, which involves implementing adaptive virtual impedance and dynamically adjusting the adaptive proportional coefficient of the active power-frequency control loop through a hierarchical timing control strategy. This includes calculating virtual resistance and virtual inductance during low-voltage faults and increasing the proportional coefficient of the active power control loop during current saturation to improve control bandwidth. The collaborative mechanism enhances the stability and response speed of the converter.
Under extreme current saturation conditions, dynamic bandwidth regulation enhances the robustness and stability of the control system, ensures the stable operation of the converter in complex fault environments, improves the reliability and synchronization stability of the power system, prevents power oscillations and inrush currents, and solves the problem of system performance degradation caused by current saturation in traditional methods.
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Figure CN122051962B_ABST