基于扰动观测器的不平衡电网下的电网形成控制
Disturbance-Observer-Based Grid-Forming Control for Unbalanced Grids
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中文总结 AI 辅助
该研究针对不平衡电网提出基于扰动观测器的电网形成控制方法，集成电流限制方案，经12.5kVA变流器实验验证可在严重故障下运行。
中文摘要 AI 辅助
本文提出一种适用于不平衡电网电压工况的电网形成控制方法。该方法调节输送到电网的正序有功功率，主动抑制负序变流器电压，在不平衡故障期间（不超出变流器物理极限时）将电压幅值控制为恒定。仅在交流侧测量变流器电流，采用扰动观测器实现同步并提供积分与谐振作用，该观测器可估计正序与负序电网电压。文中还集成了适用于平衡及不平衡故障的电流限制方案，提供了全面的稳定性分析与参数整定指南。采用12.5kVA变流器的实验结果表明，所提方法可在严重的平衡与不平衡故障期间正常运行。
英文摘要
This article proposes a grid-forming control method for operation under unbalanced grid-voltage conditions. The method regulates the positive-sequence active power delivered to the grid and actively suppresses the negative-sequence converter voltage, controlling the voltage magnitude to be constant also during unbalanced faults when within the physical limits of the converter. Only the converter current is measured on the AC side, and a disturbance observer is used for synchronization as well as providing integral and resonant action. Estimates for the positive- and negative-sequence grid voltage are obtained from the disturbance observer. A current-limitation scheme for both balanced and unbalanced faults is integrated. Comprehensive stability analysis and tuning guidelines are provided. Experimental results using a 12.5-kVA converter demonstrate that the proposed method can operate during severe balanced and unbalanced faults.
