一种并网逆变器故障穿越控制方法及系统
By introducing integrated correction of active power and coordinated control of transient virtual impedance in the VSG system, the transient stability and inrush current problems of VSG under grid faults are solved, and the safe and stable operation of the equipment and grid support are achieved.
CN122051959BActive Publication Date: 2026-07-17SHANDONG UNIV
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SHANDONG UNIV
- Filing Date
- 2026-03-02
- Publication Date
- 2026-07-17
AI Technical Summary
Technical Problem
VSG systems are susceptible to transient stability issues and transient inrush current risks during grid faults, which can lead to equipment damage and grid instability.
Method used
A phase diagram analysis-based optimization strategy is adopted, combining control parameters with a transient virtual impedance. By integrating and correcting the active power reference value and applying the transient virtual impedance, the system's stable operation during faults is ensured.
Benefits of technology
It effectively suppressed power angle oscillations and transient inrush currents, ensuring the safe and stable operation of the equipment and providing grid support during faults.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure CN122051959B_ABST
Abstract
本发明涉及新能源并网发电领域，具体公开了一种并网逆变器故障穿越控制方法及系统，方法包括获取公共耦合点电压幅值，输入故障检测单元，当其小于等于设定值时，启动低电压穿越控制；启动低电压穿越控制后，在有功环中投入无功环前级信号的积分对参考有功进行修正，虚拟阻抗部分投入暂态虚拟阻抗；电网电压恢复正常后，参考有功修正部分退出，暂态虚拟阻抗按照时间平滑退出，系统恢复正常工作模式；系统包括故障检测模块、参考有功修正模块和暂态虚拟阻抗模块。本发明引入了参考有功修正及暂态虚拟阻抗，实现了系统在不同的故障条件下的稳定运行，同时抑制了瞬态冲击电流以及暂态期间的电流，保证设备的安全运行。
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Citation Information
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