【摘要】 当前风电场次同步谐振安全评估主要采用确定性方法,没有考虑风速等随机因素影响,获得的评估结果可能过于保守或者过于乐观,不能合适地反映风电场次同步谐振的安全态势。为考虑风速不确定性影响,定义了风险矩阵、风险指数,并结合概率配点法发展了一种次同步谐振风险评估方法。应用该方法评估了考虑风速不确定性的某风电场次同步谐振风险。结果表明:低串补度时,平均风速较高的地区次同步谐振安全风险较小,而平均风速较低的地区次同步谐振安全风险较高;高串补度时则相反,平均风速较高的地区次同步谐振安全风险较大,而平均风速较低的地区次同步谐振安全风险较小;对于同一风速分布,随着串补度的升高,次同步谐振安全风险先升高,然后降低。更多还原

【Abstract】 Security assessment of subsynchronous resonance(SSR) caused by wind power generation mainly adopts deterministic assessment methods without considering wind speed uncertainty. Results from deterministic security assessment may be too optimistic or too conservative to reflect security postures. In order to analyze impact of wind speed uncertainty on SSR in wind farms, this paper defines a risk matrix and a risk index, and develops a SSR-oriented security risk assessment method using probabilistic collocation method. The proposed method is used to assess SSR security risk of a wind farm with impact of wind speed uncertainty on SSR taken into consideration. Results show that SSR security risk of the system with lower level of series compensation decreases with increase of average wind speeds, while SSR security risk of the system with higher level of series compensation rises up with increase of average wind speeds. Under the same wind speed distribution, with increase of series compensation level, SSR security risk of the system increases at first and then decreases.更多还原