基于动态虚拟电流前馈的预同步VSG功率二阶解耦策略Second-order Power Decoupling Control in Pre-synchronized VSG Based on Dynamic Virtual Current Feedforward Control
戚军;李袁超;童辉;周丹;张有兵;
摘要(Abstract):
随着分布式电源渗透率的逐步提高,虚拟同步发电机技术(virtual synchronous generator,VSG)得到了广泛的研究和应用,但传统VSG存在并网速度慢、有功/无功功率耦合影响调控效果的问题。首先在传统自同步VSG模型基础上,提出加入并网电压相角预同步单元以加快VSG并网速度。随后分析了中低压电网的功率耦合机理,结合虚拟阻抗技术,提出基于动态虚拟电流前馈的预同步VSG功率二阶解耦策略。最后,Matlab/Simulink仿真结果表明:该新型预同步VSG不仅可以实现快速平滑的并网控制,而且调控过程中有功功率和无功功率得到较好的解耦,尤其在下垂控制中还可以提高功率稳态调控精度。
关键词(KeyWords): 虚拟同步机;预同步;功率解耦;动态虚拟电流
基金项目(Foundation): 国家自然科学基金项目(51777193);; 浙江省重点研发计划项目(2019C01149)~~
作者(Author): 戚军;李袁超;童辉;周丹;张有兵;
Email:
DOI: 10.13335/j.1000-3673.pst.2019.2685
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