电力系统微分代数方程模型的暂态电压稳定性分析

Transient Voltage Stability Analysis of Differential-algebra Equation in Power System

电力系统中暂态电压失稳事故时有发生,从而引起电力界的广泛关注。目前的暂态电压稳定分析方法尚存在不足之处。基于时域仿真法、能量函数法和奇异诱导分岔理论研究电力系统暂态电压稳定问题,以期在电力系统发生大扰动后快速判断故障后系统的暂态电压稳定性,从而有利于及时采取控制措施避免系统电压崩溃。首先探讨电力系统微分代数方程(differential-algebra equation,DAE)模型及其奇异性,分析暂态电压稳定分析的保留结构模型的能量函数法,在此基础上采用奇异诱导分岔判断暂态电压失稳,以一个简单系统分析静态负荷模型及感应电动机模型对系统暂态电压稳定性的影响。

In power systems, transient voltage instability accident happened occasionally, to which engineers have already paid much attention. However, the existed methods for afialyzing transient voltage stability have some shortcomings. The problem of transient voltage stability was concerned by using the time domain simulation, energy function method and singularity induced bifurcation （SIB） theory, in order to estimate transient voltage stability of post-fanlt power systems rapidly, so that the novel control methods are adopted in time to prevent power systems from voltage collapse. Firstly, the differential-algebra equation （DAE） models and its impasse were discussed, the energy function method with network structure preserving model was analyzed. Secondly, based on the method, the transient voltage instability was estimated through the means of SIB. Finally, simulation results performed on a simple system showed that the effects of load model for transient voltage stability.