摘要
关键线路辨识是电力系统运行风险控制的重要环节。为提高辨识准确性,提出了基于有功潮流介数指标进行关键线路辨识的方法。该方法在传统电气介数指标基础上,结合电网实际潮流分布与线路输电容量的影响,物理背景更加符合电力系统实际。同时,提出了系统输电效率指标,利用关键线路连锁故障下的系统输电效率变化进行有效性校验;并分析了分布式电源的接入对电网关键线路辨识的影响。IEEE 39节点系统算例表明:少数有功潮流介数较高的线路在电网的功率传输中起着至关重要的作用,针对这些线路的连续攻击可导致潮流传输水平急剧下降,从而证明了利用有功潮流介数进行电网关键线路辨识的有效性。分布式电源接入(distributed generation,DG)的算例表明:DG的接入改善了局部电能供求关系,与之相关的重要联络线路的关键作用会减弱,关键线路辨识的结果会受到系统运行方式变化的影响。
It is an important part for the power system operation risk control to identify the critical lines. To improve the recognition accuracy, the indicator of active power flow betweenness is proposed in the model. The actual distribution of the power flow and the capacity of each transmission line are involved in the model which is more comprehensible to the physical backgrounds of power system. At the same time, check the effectiveness of the identification result by the changes of system transmission efficiency proposed in the article with the cascading failure of the critical lines. The rapid development of DG changes the active power flow of the power grid. The impact of DG on the identification of the critical lines is also analyzed in the model. The experiment on IEEE-39 bus system shows that a few high active power flow betweenness lines play a vital role in the power transmission grid. Continuous attacks against these lines lead to a sharp decline in the level of the system transmission. Thus, it is effective to identify the critical lines in power grid by using the active power flow betweenness. The example of IEEE-39 system with the DG shows that the local energy supply-demand relationships can be improved, the importance of related link lines become weakened and the identification result of the critical lines changes in different system operation modes.
出处
《电网技术》
EI
CSCD
北大核心
2016年第1期193-198,共6页
Power System Technology
基金
国家自然科学基金项目(51307097)~~
关键词
关键线路辨识
有功潮流介数
连锁故障
系统输电效率
critical line identification
active power flow betweenness
cascading failures
system transmission efficiency
