中文摘要：

基于直流潮流的有功调整模型广泛应用在发输电系统可靠性评估中,但其忽略了系统网损,当系统出现发电容量不足时,网损的存在会使系统切除更多的负荷,从而影响系统的可靠性;同时,该模型没有考虑系统电压/无功因素的影响,无法发现系统存在的电压问题。因此,将网损引入到可靠性评估的有功调整模型中,使系统状态调整后的交流潮流计算结果变得合理,避免出现平衡机出力越限问题;然后在潮流PQ分解法的基础上提出了电压/无功调整的线性化模型,以研究电压因素对系统可靠性指标的影响。最后,对IEEE-RTS系统进行了发输电系统可靠性评估,研究了网损及不同调压手段对系统可靠性指标的影响。

英文摘要：

The active power correction model based on the DC load flow has been widely used in the reliability assessment of bulk power systems.However,because the network loss is ignored in the DC load flow model,the reliability indices obtained may be over-optimistic,especially when there exists generation deficiency.On the other hand,this model doesn＇t consider the influence of voltage and reactive power adjustments,consequently the voltage problem of the power system can not be identified with this approach.To deal with this deficiency,the network loss is introduced in the traditional active power adjustment model,which will avoid violation of outputs of the generating units at the slack bus.A comprehensive incremental linear model for the voltage and reactive power adjustment is proposed using PQ decomposition algorithm.The voltage and reactive power adjustment model can be used to analyze the impacts of different voltage adjustment strategies on the system reliability indices.Finally,the IEEE-RTS system is utilized to illustrate the effects of net loss and different voltage adjustment strategies on the system reliability indices.