基于时滞反馈控制系统抑制次同步谐振

Mitigating subsynchronous resonance (SSR) using delayed feedback control system

现今大容量远距离输电系统已成为必然的发展趋势,但其由于系统自身机构可能会引起次同步谐振从而破坏电力系统的稳定性。为了降低次同步谐振带来的影响,以IEEE Second Benchmark Model作为基础模型,介绍了基于时滞反馈理论所设计的新型控制器并运用其来抑制由于次同步谐振所引起的轴系扭曲。同时借助于特征根聚类法(CTCR)计算出时滞反馈控制器的稳定时间延迟区域。最后以非线性模型的时域仿真来校验时滞反馈控制器抑制次同步轴系谐振的效果,通过仿真可以得出时滞反馈控制系统能有效地抑制次同步谐振。

Nowadays, larger capacities of power transmission over longer distance are becoming the main feature of power systems, but it may cause subsynchronous resonance as a result of damaging power system stability. Based on the IEEE Second Benchmark Model as a basic model, this paper presents the design of the new controller based on ：the delay feedback theory, and applies it to damp unstable torsional oscillations caused by Subsynchronous Resonance （SSR）. The stable time delay parameter of the delayed feedback controller is managed by means of employing the Cluster Treatment of Characteristic Roots （CTCR）. The effectiveness of damping Subsynchronous Resonance is demonstrated via time-domain simulations on the nonlinear model and it shows that delayed feedback control system can effectively inhibit subsynchronous resonance through simulation.