考虑风电场的电网连锁故障预测与安全防御

Cascading failure forecasting and security defense to power grid based on the running state and structure

伴随着我国新能源发电特别是风力发电的大规模并网,风力发电的随机性、实时性、波动性的特点已经成为了影响电网安全、稳定的一个重要因素,可能诱发电网连锁故障.本文首先通过静态能量函数模型和电气介数,提出了引发电网连锁故障的关键线路辨识指标和计算方法.再次,搭建了含双馈风电场的电网模型,得到随风电场出力变化造成的电网稳定变化曲线,在系统发生初始故障后,通过保护措施使具有较高加权电气介数的支路能够安全运行,提高系统的稳定能力,防御连锁故障发生.验证了该方法的合理性及有效性.

With the development of wind power,the characteristics such as stochastic volatility and ab-sorbing reactive power of wind power make it become a disturbance source of power grid,and fur-ther impact the vulnerability of the system.A weighted electric betweenness is constructed which takes the topological structure of the grid into consideration and reflects the actual operation state of the grid by introducing a complex network theory.And accordingly,the grid key line identifica-tion index and calculation method are put forward,which causes cascading failure of the grid.Sim-ulating by building grid model with double-fed wind farm,we got a continuous curve that compre-hensive assessment indicators changes with integrated wind.Finally.Proving that the occurrence and development of cascading failure can be effectively delayed or even be prevented by protecting the branch circuits with higher weighted electric betweenness,and then the effectiveness and ra-tionality of this method is verified.