考虑事故后频率约束的两阶段经济调度

刘亚娟，童小娇，2,尹　昆

(1. 长沙理工大学 智能电网运行与控制湖南省重点实验室，湖南长沙410114；2. 湖南第一师范学院，湖南长沙410205)

考虑事故后频率约束的两阶段经济调度

刘亚娟1，童小娇1，2,尹昆1

(1. 长沙理工大学 智能电网运行与控制湖南省重点实验室，湖南长沙410114；2. 湖南第一师范学院，湖南长沙410205)

摘要：为了保证事故后电力系统仍能正常运行，基于多阶段决策的思想提出了考虑事故后频率约束的两阶段随机经济调度模型。该模型中同时考虑事故前(第一阶段)和事故后(第二阶段)系统的运行成本，分别称为“当前成本”和“未来成本”。第一阶段的优化目标函数考虑在满足供电可靠性的条件下使常规机组和风电机组的发电成本最小；为了保证系统频率在事故后较短时间内恢复正常，第二阶段考虑了对低频减载的约束，目标函数为常规机组和风电机组的发电成本，风能高估低估的惩罚成本以及减负荷的惩罚成本最小。针对模型的非光滑性，采用光滑化方法对其进行处理，并以IEEE30节点系统进行仿真，仿真结果验证了新模型和算法的有效性。

关键词：频率约束；两阶段；经济调度；低频减载；光滑化方法；惩罚成本

中图分类号：TM711

文献标识码:A

DOI:10.3969/j.issn.1672-0792.2015.04.004

收稿日期：2015-02-05。

基金项目：国家自然科学基金(11171095)。

作者简介：刘亚娟(1989-)，女，硕士研究生，从事电力系统运行与控制方面的研究，E-mail: 827216369@qq.com。

Abstract：In order to ensure the normal operation of power system after accidents, on the basis of multi-stage decisions, a two-stage stochastic economic dispatch model with frequency constraining post-contingency is proposed. In this new model, pre-contingency (the first stage) and post-contingency (the second stage) system operating costs are taken into account, called the “current cost” and “future cost”. The objective of the first stage is to minimize the generation cost of conventional units and wind turbines. In order to ensure the system frequency can return to normal in a short time after contingency, we constrain the amount of under-frequency load shedding (UFLS) in the second stage, the objective of the second stage is to minimize the generation cost, penalty cost of wind overestimation and underestimation and the penalty cost of load shedding. Due to the non-smooth characteristic of model, the smoothing function method is used. Finally, the IEEE30 node illustrative system is tested and the results verify the efficiency of the new model and algorithm.

Keywords：frequency-constrained; two-stage; economic dispatch; under-frequency load shedding; smoothing function; penalty cost electric vehicles

0引言

电力系统经济调度考虑在满足能量平衡和运行约束下的最优化问题[1,2]。现有的电力系统经济调度……