考虑风电并网的发电充裕度评估方法的比较

Comparison of adequacy evaluation methods considering grid-connected wind power

介绍了解析法、状态抽样法、状态持续时间抽样法3种可靠性评估方法的原理;提出了解析法和状态抽样法中考虑风电机组随机停运时的风电场建模方法,并与状态持续时间抽样法中的相应建模方法进行了比较;分别采用3种方法对风电接入前后RBTS和IEEE RTS79系统的发电充裕度指标进行了计算。算例分析表明,在风电机组独立停运的假设下,风电机组的强迫停运率对系统发电充裕度的影响较小;3种发电评估方法评估结果接近,其中状态持续时间抽样法具有便于计入风电机组强迫停运率、风电接入后系统的评估时间不会显著增加等特点,更适合进行风电并网后的大规模电力系统的可靠性评估。

Three reliability evaluation methods are introduced in principle：analytical method,state sampling method and state duration sampling method. The modeling methods of wind farm with random outage are proposed for the analytical method and state sampling method,which are compared with that for the state duration sampling method. Three methods are respectively applied to calculate the generation adequacy indexes of RBTS and IEEE RTS79 systems with and without wind farm. Case analysis shows that,on the assumption of independent outage of wind turbine,the impact of its FOR（Forced Outage Rate） on the generation adequacy indexes is small;the results calculated by three methods are approximately equal;the state duration sampling method is more suitable for the reliability evaluation of large-scale power system with wind farms due to its easy integration of wind turbine FOR and insignificant increase of calculation load.