基于潮流模型的在线静态安全评估方法准确性探究

Study on the Accuracy of Online Static Security Assessment Method Based on Power Flow Model

现有在线静态安全评估方法基于传统潮流模型在轻载条件下效果较好。随着社会的不断发展,电力系统负荷增加,基于潮流模型的在线静态安全评估方法的准确性受到考验。本文研究在不同负荷条件下,故障后潮流解与时域仿真模型稳态解之间的差距。实验结果表明,潮流解与时域仿真稳态解之间的差距普遍存在,且此差距随负荷加重而增大,使得重载条件下基于潮流模型的在线静态安全评估方法的准确性受到很大影响。本文提出在静态安全评估中应用混合模型,在兼顾快速性的前提下,提高了方法的准确性,有利于现代电力系统的安全稳定运行。

Based on the traditional power flow model,the existing online static security assessment(OSSA)method has better performance. With the development of society,the load of power system increases,and the power flow model may not be accurate enough for the online OSSA method. In this paper,the gap between the power flow solution and the steady-state solution of a time-domain simulation model under fault is studied. Experimental results show that this gap exist generally,and it increases with the growing load. As a result,the accuracy of the SSA method based on the power flow model will be seriously affected in a heavy loading condition. A hybrid model is suggested to be applied in OSSA;under the premise of taking into account rapidity,the accuracy of the method is improved,which is helpful for the safe and stable operation of modern power system.