实时调度对机组运行基点调节范围有限,相对于运行经济性,其对电网运行安全性的意义更为突出。基于优先目标规划与静态安全域分析的方法,构建以自动发电控制机组运行基点与参与因子为决策变量的多目标实时调度模型。模型具有两层目标:第1层以系统平抑扰动能力最大化为目标,即要求系统运行中的静态安全域与节点扰动域重合范围(有效静态安全域)最大化;第2层则以系统发电成本与备用成本最小化为目标。模型两层目标具有明确等级顺序,实现有效静态安全域最大化条件下的经济最优性,体现实时调度保证电网运行安全的首要任务。通过对示例系统的测试计算与分析证明了所提方法的有效性。
As the regulation range of base-point is limited in real-time dispatch, security improvement is more prominent than economy improvement for real-time dispatch. Based on preemptive goal programming (PGP) and steady-state security region methods, this paper proposed a model of real-time dispatch, in which base-points and participation factors of automatic generation control (AGC) generators are chosen as decision variables. This model has two goals. One is to maximize the ability to depress load disturbances, which means maximizing the overlap region of the steady-state security region and the load variation region (the overlap region is named as effective steady-state security region). The other is to minimize the operation costs. By setting the first goal as the preemptive goal, economic dispatch results can be obtained without reducing effective steady-state security region to ensure the safety operation of power systems. Numerical tests demonstrate the effectiveness of the proposed approach.