考虑可中断负荷的风电接入系统旋转备用双层优化方法

风电接入规模的不断扩大加大了电力系统的波动,使得电网需要配置更多的旋转备用(spinning reserve,SR)抑制电力系统波动与电网等效负荷预测偏差,传统以固定比例配置常规机组旋转备用容量的方法经济性差且未考虑系统内其他资源。考虑辅助服务市场进一步开放以及可中断负荷特性,将可中断负荷与常规机组一同参与辅助服务市场,文章提出了一种考虑可中断负荷的旋转备用双层优化方法。该方法以时间为尺度,上层优化日前协议签订的容量成本,下层优化日内实时调用成本,构建优化总期望成本的双层优化目标函数,基于序列化建模思想将系统等效负荷预测偏差离散化得出相应决策期望值,通过商用软件CPLEX求解目标函数获得各时段可中断负荷与常规机组最优备用容量。最后以新疆某地区实际运行数据进行算例分析,验证所提方法的可行性。

Two-Level Optimization Method for Spinning Reserve in Wind Power System Considering Interruptible Load

With the continuous expansion of wind power access, the fluctuation of the power system is increasing. The grid needs to configure more spinning reserve to suppress fluctuations of the power system and the forecast deviation of equivalent load. Traditional method that configures conventional spinning reserve capacity at a fixed proportion without considering other resources in the system has poor economy. Considering the further opening up of the ancillary service market and the characteristics of interruptible load, the interruptible load and conventional units are combined to participate in the ancillary service market. The proposed method is based on time scale, where the upper optimization has agreement with the capacity of the cost, the lower optimization call cost in real-time within days. The method constucts an optimal bi-level optimization objective function aimed at total expected cost. On the basis of the idea of serialization modeling, the system equivalent load forecasting deviation is discretized to obtain the corresponding decision expectation. The Commercial Software CPLEX is used to solve the objective function to obtain the interruptible load and the optimal reserve capacity of the conventional units. Finally, an example is given to verify the feasibility of the proposed method.