基于虚拟同步发电机控制的并网变流器同步频率谐振机理研究  

Synchronous Frequency Resonance in Grid-connected VSCs with Virtual Synchronous Generator Technology

作　　者：王金华[1] 王宇翔[1] 顾云杰[1] 李武华[1] 何湘宁[1] 

机构地区：[1]浙江大学电气工程学院,杭州310027

出　　处：《电源学报》2016年第2期17-23,共7页Journal of Power Supply

基　　金：国家重点基础研究发展计划(973计划)资助项目(2012CB215106)~~

摘　　要：虚拟同步发电机控制策略是解决高渗透率新能源并网问题的有效方案之一。然而,不同于传统同步发电机,变流器模拟的虚拟同步发电机因其快速灵活的调节能力可能引发同步频率谐振现象。通过建立精确的虚拟同步发电机动态模型,分析得到同步频率谐振现象是由电磁磁链的动态过程引入;基于此谐振在控制参数设计不合理时会带来稳定性问题,提出2种阻尼控制的策略来抑制同步频率谐振现象。最后,通过搭建8 k W实验平台,验证了虚拟同步发电机中的同步频率谐振现象及所提阻尼控制策略的有效性。The virtual synchronous generator（VSG） technology is an effective solution for distributed generations interfacing into the power system. Although the VSG is controlled to operate as a synchronous generator, the fast and flexible control capability of power electronics converters may give rise to some undesirable characteristics. It is investigated that electro-magnetic dynamics may induce synchronous frequency resonance in VSGs, which possibly leads to power oscillations. A rigorous dynamic VSG model is established to explore the synchronous frequency resonance phenomena. Based on this model, two damping control methods are proposed, which suppress the resonance through increasing the virtual inertia or adding virtual resistance. The effectiveness of the theoretical analysis is verified by experimental results.

关 键 词：虚拟同步发电机 电磁暂态 同步频率谐振 阻尼控制 

分 类 号：TM4[电气工程—电器]