计及风险备用约束的含风电场电力系统动态经济调度

为解决风电的不确定性给电网调度带来的问题,必须开展含风电场的经济调度问题研究。通过引入风速和负荷预测误差的概率分布函数来描述系统中存在的不确定性因素,提出了一种基于风险备用约束的含风电场电力系统动态经济调度新模型。在目标函数中采用惩罚的方式对风电计划出力相对于实际出力的偏差所造成的备用成本加以考虑。该模型采用收敛特性稳定的非线性预估–校正原对偶内点法进行求解。通过含有一个风电场的10机组系统算例,验证了所提调度模型的可行性。分析表明,该模型可以在保证系统可靠性要求的基础上,实现经济性最优的目标。

Dynamic Economic Dispatch of Wind Integrated Power Systems Based on Risk Reserve Constraints

In order to solve the electric power dispatch problems caused by the uncertainty of wind power,economic dispatch of wind-integrated power systems should be investigated.The probabilistic distributions of wind speed and load forecast errors were introduced to describe the uncertainty in power systems,and a novel risk reserve constrained dynamic economic dispatch optimization model with wind power penetration was proposed.The required up and down spinning reserve costs were also included in the objective function,which stands for the costs caused by the risk of shedding load and penalty of wasting energy,respectively.The model was solved by predictor-corrector primal-dual interior point method.Simulation results of a system with ten conventional generators and one wind farm validated the feasibility of the proposed method.Analysis shows that the optimal-economy can be realized when reliability requirement is satisfied.