受风电、光伏等新能源出力的不确定性因素影响,需重新对有接入新能源的新型电力系统进行概率潮流计算与静态安全稳定性分析,目前所采用的Monte-Carlo法存在计算耗时长的问题,难以运用于实际工程.为此,基于光照强度和风速概率分布特性,分别构建光伏阵列和风力发电机组的出力概率密度函数模型,采用基于Gram-Charlier 级数展开的半不变量法进行概率潮流计算,实现了对含风电、光伏接入的新型电力系统的潮流计算和静态稳定分析.以IEEE(Institute of Electrical and Electronics Engineers)30标准测试模型为算例对所提算法进行验证,结果表明,所提算法在保持Monte-Carlo法高精度优点的同时还具有较高的计算速度;研究了风电和光伏渗透率对电力系统潮流和静态安全稳定性的影响,结果表明,随着渗透率的增加,潮流分布值域扩大且部分支路可能出现负值,存在功率反向传输问题,导致系统运行风险增大;探索了线路增容对降低有功功率和节点电压越限风险以及提高静态安全稳定性的效果.
Research on static security and stability of power system with wind power and photovoltaic power integration based on probabilistic power flow
Due to the uncertainty factors in the output of new energy such as wind power and photovoltaics,it is necessary to recalculate the probability power flow and analyze the static safety stability of new power systems with access to new energy.The Monte-Carlo method currently used has the problem of long computation time,making it difficult to apply in practical engineering.Based on the probability distribution characteristics of light intensity and wind speed,the output probability density function models for photovoltaic arrays and wind turbines respectively is constructed,and the semi-invariant method based on Gram-Charlie series expansion for probabilistic power flow calculation is used to realize power flow calculation and static stability analysis for new power systems with wind power and photovoltaic.In this paper,the IEEE(Institute of Electrical and Electronics Engineers)30 standard testing model is taken as an example to verify the proposed algorithm.The results show that the proposed algorithm maintains the high accuracy advantage of Monte-Carlo method while having a high computational speed.Furthermore,the influence of wind power and photovoltaic permeability on power flow and static safety stability of power system is studied.The results show that as the permeability increases,the range of flow distribution values expands and some branches may have negative values,leading to power reverse transmission issues and the increase of operational risk of the system.Then,the effects of line capacity expansion on reducing the risks of active power and node voltage exceeding limits,as well as improving static safety and stability are explored.
probabilistic power flowsemi-invariant methodseries expansionnew energy accessstatic safety stability
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