基于预估/校正技术的改进奇异值指标

潮流雅可比矩阵最小奇异值可用来评估系统电压稳定裕度。但这种方法受到发电机无功出力越限的影响,给出的结果不够精确。该文致力于改进这一裕度指标,为此提出了利用预估/校正技术的算法来快速找到系统中电压崩溃点之前发电机无功越限信息,并利用这些信息修正潮流雅可比矩阵,使得其阶数不再受到发电机无功越限的影响,从而改进了最小奇异值裕度指标的线性性。给出了一个IEEE-14节点网络算例并得到预期结果。最后给出了结论,即利用预估/校正技术有效地克服了最小奇异值指标的阶跃性,提高了潮流雅可比矩阵最小奇异值作为裕度指标的可靠性。

Improved singular value index based on predictor/corrector technique

The minimum singular value of the power flow Jacobin matrix can be used to evaluate the voltage stability margin.But it is affected by the generator encountering reactive limits,so the results are not very exactly.To improve this margin index,this paper proposes a predictor/corrector technique which can quickly find the limit points before the voltage collapse of the system and then the Jacobin matrix of power system can be modified to keep its dimension unchanged at the limit points.So the minimum singular index with discontinuity due to the attainment of generator capability limit can be greatly improved with good linearity.This method is applied to IEEE-14 bus system with promising results.Finally,the conclusion of the paper is given.Using predictor/corrector technique can overcome the break of the minimum singular value index effectively,and improve the reliability of the minimum singular value as an margin index of voltage stability.