适用于多源系统次同步振荡分析的图形化建模方法

新能源电力系统的次同步振荡问题呈现出多源参与特性,风、光、火多电源并存场景下,采用传统方法建立多源系统的状态空间模型,实施难度较大。提出一种图形化建模方法,该方法基于由基本元件构成的图形化模型库(状态空间形式),可以直观地构建复杂系统状态空间模型,并可在源网接口处理上提供较大便利。所提方法在SSR第一标准模型上进行了准确性验证。此外,建立风火打捆经直流送出系统的状态空间模型,分析风电接入对火电机组轴系次同步扭振模式的影响。最后得出图形化建模方法相对于传统方法具有独立性强、灵活性高、可视性好和扩展性强的优点。

A Graphical Modeling Method Applied for Multi-Sources System Subsynchronous Oscillation Analysis

Multi-sources have participated in the subsynchronous oscillation of renewable energy power system. Conventional approach for state space modeling of multi-sources system is difficult to be employed in the situations where wind power, photovoltaic and thermal power operate parallelly. This paper presents a graphical modeling method, based on a graphical model library containing basic units in the form of state space model. The proposed method can establish the state space according to complex system visually. In addition, it is more convenient for the source-to-grid interface processing. The study case of IEEE first benchmark model for subsynchrnous oscillation verified the proposed method. What's more, a state space pertaining to the multi-sources system was modeled, where wind power bundled with thermal power transmitted through HVDC line. The influence of wind power on subsynchronous torsional modes belonging to thermal generator was studied. The advantages of graphical modeling method over conventional approach are strong independence, high flexibility, good visibility and strong extensibility.