考虑潮流水平变化的电网二级连锁过载中的涨落现象研究

针对电网的二级连锁过载模式,从网络保持结构完整性的角度,研究了潮流水平的变化所引起的涨落现象。首先依据支路因连锁过载开断而削弱电网的基本思路,定义了一种反映网络保持结构完整性的统计涨落模型,然后以IEEE 39节点系统为例,通过连续增加电网节点注入功率的方式,研究了电网在初始故障作用下发生连锁过载的涨落变化规律。分析表明,在电网二级连锁过载事件中,随着系统总的有功负荷的提高,相关物理量的涨落变化总体呈上升趋势,而且存在着比较明显的涨落放大的临界点。最后通过IEEE 14节点系统上的算例对此规律做进一步的验证。

Research into fluctuation phenomenon of cascading overload with two stages in power network considering power flow level

Aiming at cascading overload phenomenon in power network and considering structural integrity, the fluctuation phenomenon is researched into. Firstly, according to the thoughts that a power network is often weakened by cascading failure of branches, a statistical fluctuation model which can represent the structural integrity of a power network is proposed. Then an example in IEEE 39- bus system with continuously increasing of the injection power of nodes is given. The analysis results show that the fluctuation value of the relative parameter increases with the increase of the total load of the power system, and a critical point exists in that course. At last, in order to further prove that regulation, another example with IEEE 14-bus is analyzed.