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VSG(虚拟同步发电机)由于电流限幅、阻尼大等特性,接入电网后对系统稳定性会产生影响。搭建了一种较为准确的VSG模型,在计及VSG特性的情况下,采用Lyapunov直接法对接有VSG的单机无穷大系统进行暂态稳定性分析,并用时域仿真的结果来验证其准确性。结果表明:VSG接在四机两区域系统的受端相比送端,临界能量更小,系统更容易失稳;将VSG接在送端时,增加VSG的占比,临界能量呈减小的趋势,系统失稳的可能性增大。
Abstract：VSG(virtual synchronous generator) has its characteristics such as current limit and large damping,which affect the stability of the system after it is connected to the grid. A more accurate VSG model is built.Considering the characteristics of current limit and large damping of VSG, the Lyapunov direct method is used to analyze the transient stability of the single-machine infinity system with VSG and the results of the time-domain simulation are used to verify its accuracy. The results show that when VSG is connected to the receiving end of the four-machine two-zone system, the critical energy is smaller, and the system is more susceptible to instability; when the VSG is connected to the transmitting end, the proportion of VSG is increased, the critical energy is decreased, and the possibility of system instability is increased.
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基本信息:
DOI：10.19585/j.zjdl.201910009
中图分类号:TM712;TM341
引用信息:
[1]高振,雷为民,赵峰,等.基于Lyapunov直接法的虚拟同步发电机并网暂态稳定性分析[J],2019,38(10):52-60.DOI:10.19585/j.zjdl.201910009.