风力发电系统可靠性评估体系

Ｒeliability Evaluation System of Wind Power Generation System

摘要:

由于风电具有随机性、间歇性和波动性等特点,风力发电系统的可靠性对大规模并网电力系统安全性造成较大影响,如何准确评估风力发电系统可靠性,这提出了全新的挑战。首先分析了风力发电系统的结构特点,提出了一种基于期望故障受阻电能相等的方法,用相同容量的发电机等效替代风电机"组串",并根据元件状态特性对系统可靠性状态进行划分,最后建立时间、出力、系统等指标体系。通过实际系统进行仿真分析,结果表明该指标体系能够准确地对风力发电系统的可靠性进行评估。

Abstract:

Because of the randomness，intermittence and fluctuation of wind resource，its reliability has great influence on the security of large － scale integrated power system． How to accurately evaluate the reliability of wind power generation system poses a new challenge． Firstly，the structure and output of wind power generation system are analyzed． A method based on equal expected energy not supplied ( EENS) is proposed to substitute a generator with the same capacity for wind turbine " string" equivalently． In addition，the reliability state is divided by the component state characteristics． At last，the system reliability is comprehensively evaluated by the time，the output and the system． According to the simulation on an actual wind power system，the result shows that the index system can accurately evaluates the reliability of wind power generation system．