考虑风电并网的系统充裕度评估

Adequency Evaluation of Power System with Wind Energy Intergration

风电的随机性和波动性特性进一步加剧电网运行矛盾,立足于场景法,提出一种系统化的计及风电出力的电力系统充裕度评估方法。该方法为了最大程度地拟合风机出力的随机性特性,建立了基于拉丁超立方采样法(Latin hypercube sampling,LHS)和同步回带削减(Simultaneous backward reduction,SBR)技术的风电可靠性评估模型。该模型同时考虑了常规机组和风电机组的强迫停运率,涵盖了风机出力、常规机组出力和负荷三种典型场景,为含风电电力系统充裕度评估的所有阶段提供了模型化支持。在前期工作的基础上,给出了电力充裕度和调峰充裕度指标计算方法,具有一定的可行性;利用充裕度指标引入平衡点的概念,为确定合适的风电接入规模提供了指导。最后应用IEEE-RTS系统进行电力系统的综合充裕度评估,验证了该方法的可行性和有效性。

Uncertainty and fluctuation characteristics of wind power will intensify contradiction to power grid security operation.This paper proposes a systematic method to assess adequacy indexes of power system containing wind farms,which is based on scenario method.In order to have good approximation of wind power variation,a reliability assessment model is established based on the Latin hypercube sampling（LHS）and Simultaneous backward reduction（SBR）technique.The model take into account both the forced outage rate of traditional units and wind turbines and contains three typical scenarios for the output of the wind turbine,the conventional unit and the load,which provides support for adequacy evaluation for power system containing wind farm at all stages.On the basis of the preliminary work,the paper proposses a calculation method for adequacy indexes of electric power supply and peak-load regulation demand,which has certain rationality and feasibility.This paper introduces a concept of Equilibrium Point which will provide guidance to determine the appropriate capacity of the wind power.At last the results on IEEE-RTS system with wind farms demonstrate that the proposed method is feasible and effective.