多能源系统中长期协调运行模型与方法

Medium-and long-term coordinated operation model and method for multi-energy system

中长期运行是电力能源系统运行的重要内容,能有效应对能源供应的季节性矛盾。针对电力、天然气等多种形式能源间耦合性不断增强的趋势,提出一种面向多能源系统的中长期运行模型和方法。考虑可再生能源的季节特性、天然气价格的波动情况,计及系统运行约束以周为时间单位构建多能源系统运行模型,对年度的发电机组检修计划、水电电量分配和天然气的购买及贮存计划进行统一优化。以修改的IEEERTS79系统为算例,分析验证所提模型与方法的正确性、有效性。算例结果表明,统筹安排多能源系统的中长期运行能发挥不同能源形式的互补效益,提升系统的运行经济性;引入储气装置能缓解冬季供气紧张现象,降低系统的运行成本。

Medium-and long-term operation is an important part of power system operation,which can effectively deal with the seasonal contradiction of energy supply. In view of the increasing coupling among multiple energy forms,such as electric power,natural gas,and so on,a medium-and long-term operation model and method for multi-energy system are proposed. Considering the seasonal characteristics of renewable energy,the fluctuations of natural gas price and the system operation constraints,the weekly operation model of multi-energy system is established,and the annual unit maintenance plan,the power distribution of hydropower and the purchase and storage plan of natural gas are optimized uniformly. Taking the adapted IEEERTS79 system as an example,the correctness and validity of the proposed model and method are analyzed and verified. The results show that the coordinated arrangement of the medium-and long-term operation for multi-energy system can give play to the complementary benefits of different energy forms and improve the system’s operation economy. The introduction of gas storage device can relieve the air supply tension in winter and reduce the system’s operation cost.