含分布式发电的配电网安全风险评估的研究

Security risk assessment of distribution network considering distribution generation

随着分布式发电技术快速发展,分布式电源在配电系统中的渗透率越来越高,与此带来的安全影响不可忽视,需要进行有效的安全评估。提出了基于层次分析法的综合评估算法(CEA-AHP),该算法通过建立分布式电源接入电网的节点模型,结合配电网灵活的结构特性,利用效用理论,从低电压风险、负荷过载风险和失负荷风险三个方面对该类配电网进行安全风险综合评估。采用IEEE33节点配电系统,通过对原配电系统、加入DG后配电系统及切除部分联络线后系统进行分析验证,表明该算法能够准确反映同一假想故障不同重构方案下和不同假想故障下电网安全性的相对高低,为含分布式的配电网安全风险评估、检修和规划提供可靠参考。

With the rapid development of DG technology, penetration rate of DG from distribution network is increasing, meanwhile the security influence cannot be ignored which need effective security evaluation. The comprehensive evaluation algorithm based on analytic hierarchy process ( CEA-AHP) is presented DG node model to power grid is established, combining flexible structure quality of distribution network, the security risk of this kind of power grid is comprehensively evaluated by using utility theory, through low voltage risk, overload risk and loss of load risk three aspects. Adopting IEEE 33 nodes distribution network system, by analyzing the original system, considering DG system and system of cutting a tie-line, the example has shown this kind of evaluation can reflect relative level of power grid security under different hypothetical accidents and the various reconfiguration method in a certain accident, providing reliable reference for assessment, overhaul and planning about distribution network considering DG.