计及多时间尺度灵活性的电-气互联系统优化调度方法

Optimal scheduling method for electricity-gas interconnected system considering multi-time-scale flexibility

电-气互联系统包含电力与天然气子系统,存在多种能源耦合与存储设备,运行差异明显,并且随着新能源发电的接入,系统灵活协调运行能力受到挑战。对此,提出采用多时间尺度调用多种类资源的电气综合能源系统优化调度方法。首先,建立系统内能源设备准稳态出力模型,以系统日运行成本最优为优化目标,考虑不同能源与设备运行特性,采用不同时间尺度和步长优化电力储能与其他设备运行出力,有序调度系统内不同种类设备,更快追踪负荷与新能源波动。然后,引入随机机会约束描述剩余灵活资源供给能力,以提高系统灵活性与鲁棒性。最后,使用配电网与天然气耦合系统进行算例分析,验证了所提方法的有效性。

The electricity-gas interconnected system includes the electricity and gas subsystems.It has a variety of energy coupling and storage devices with obvious differences in operation.And with the access of new energy power generation,the flexible and coordinated operation of the system is challenged.In this regard,an optimal scheduling method for integrated electricity-gas energy system using multiple time scales to call multiple types of resources is proposed.Firstly,a quasi-steady-state output model of energy equipment in the system is established.The proposed model takes the optimal daily operation cost of the system as the optimization goal,considers the different operation characteristics of energy sources and equipment,uses different time scales and step sizes to optimize the operation output of the power storage and other equipment,and dispatches different resources in the system in an orderly man-ner to fast track the fluctuations of the load and the new energy.Secondly,the random chance constraints are intro-duced to describe the remaining flexible resource supply capacity to improve the flexibility and robustness of the sys-tem.Finally,the distribution network and gas coupling system are used to conduct a case study to verify the effectiveness of the proposed method.