A Virtual-Filter-Based Stability Enhancement Control for Grid-Connected Converter in DC Microgrids under Unbalanced Grid Conditions
发布时间：2025-11-05
点击次数：
- 发布时间：
- 2025-11-05
- 影响因子：
- 5.0
- DOI码：
- 10.1016/j.ijepes.2024.110224
- 论文名称：
- A Virtual-Filter-Based Stability Enhancement Control for Grid-Connected Converter in DC Microgrids under Unbalanced Grid Conditions
- 发表刊物：
- International Journal of Electrical Power & Energy Systems
- 关键字：
- DC microgrid; Grid-connected converter (GCC); Reference Current Generation (RCG); Small-signal stability; Virtual Impedance (VI); Unbalanced grids
- 摘要：
- DC microgrids, considered building blocks of smart grid technologies, are subjected to small-signal instability due to the extensive introduction of power electronics devices. Therefore, in this paper, a sequence Virtual Filter (VF) controller, which considers not only the longitudinal virtual parameters but also the lateral capacitance and resistance, is first developed to increase the flexibility of system stability adjustment compared to the Virtual Impedance (VI) controller. Then, as distribution feeders are normally unbalanced and the application of the proposed sequence VF controller may amplify the distortion of imbalances on DC voltage, a novel Reference Current Generation (RCG) strategy considering the VF controller is proposed for Grid-Connected Converter (GCC) to improve DC microgrid power quality. The double-frequency fluctuation of the DC-link voltage is eliminated by regulating the oscillation of the active power flowing into the converter instead of the Point of Common Coupling (PCC) to 0. The PSCAD simulation results illustrate that the sequence VF controller can enhance the stability adjustment since, in some cases, the system can only be stabilized by adjusting lateral parameters. On the other hand, the proposed RCG strategy can significantly reduce DC voltage fluctuations compared to the traditional approach. Furthermore, incorporating the proposed strategy with the sequence VF controller offers greater flexibility in reducing the negative-sequence current while maintaining a power transfer capacity for GCCs in a master–slave-based DC microgrid, comparable to that of the traditional strategy.
- 合写作者：
- Xintong Liu,Hao Qi,Yueming Ji,Yinan Xiang
- 第一作者：
- Hanwen Gu
- 论文类型：
- 期刊论文
- 通讯作者：
- Zaibin Jiao
- 卷号：
- 121
- 期号：
- 110224
- 页面范围：
- 1 - 13, International Journal of Electrical Power & Energy Systems
- 是否译文：
- 否
- 发表时间：
- 2024-10-15
- 收录刊物：
- SCI