考虑实时备用率的中长时间尺度新能源发电备用的方法

Study on integration of medium and long time scale new energy power supply into reserve

在新型电力系统中,考虑到中长期时间尺度下新能源出力具有较强规律性,提出了中长时间尺度新能源纳入备用的实时备用率的确定方法。根据实时备用率将新能源可信出力纳入备用,建立多电源电力生产模型。所建模型以生产成本最小为目标函数,考虑电源运行成本、新能源弃电成本、切负荷惩罚成本及机组出力、功率平衡、逻辑变量等约束条件。采用时间迭代将中长时间生产模拟化简为短期优化问题,利用CPLEX求解。以改进IEEE-24节点系统作为算例,优化结果表明新能源电源采用实时备用率的方法纳入备用时,电力系统生产运行总成本更低;新能源渗透率越高,纳入新能源为备用的经济效益越明显;风电和光伏独立确定备用率时,备用成本和污染排放更低。

In the new power system with new energy as the main body,considering the strong regularity of new energy output in medium and long-term time scales,a method for determining the real-time reserve rate of new energy in medium and long-term time scales is proposed.According to the real-time reserve ratio,the credible output of new energy power is included in the reserve,and the multi-power power production model is established.The model establishes the objective function with the minimum production cost,and considers the constraints such as power operation cost,new energy abandonment cost,load shedding penalty cost,unit output,power balance and logical variables.The time iteration is used to simplify the medium-and long-term production simulation into a short-term optimization problem,which is solved by CPLEX.Taking the improved IEEE-24 node system as an example,the optimization results show that the total cost of power system production and operation is lower when the new energy is included in the reserve by using the real-time reserve rate method.The higher the permeability of new energy is,the more obvious the economic benefits of reserve is.When the spare wind power and the photovoltaics are inde-pendently induce in the reserve rate,the production and operation costs will be lower.