大规模火电灵活性改造背景下电—热能源集成系统优化调度

doi:10.12204/j.issn.1000-7229.2021.05.004

摘要/Abstract

摘要：

对于燃煤机组占比较高的国家而言,实施灵活性改造是增强电力系统灵活性的关键手段之一。然而,机组改造后系统角色及运行方式均发生了转变,原有的建模方法及调度策略已不适用。基于此,文章提出了一种考虑火电差异化灵活性改造的电-热集成系统优化调度方法。首先,对比分析了2种类型火电机组灵活性改造的相关技术及特点,采用顶点凸组合法对纯凝机组多阶段调峰、热电联产机组多模式运行过程进行统一建模。其次,以系统总运行成本最小为目标函数,以电热平衡、机组运行模式、机组爬坡和启停为约束,建立了电热集成系统优化调度混合整数规划模型。最后,通过算例对模型的有效性和适用性进行了验证。结果表明所提模型可大幅提升系统风电消纳能力,降低系统运行成本,可有效缓解“三北”地区电网调峰压力。

关键词: 灵活性改造, 电热集成系统, 优化调度, 混合整数规划

Abstract:

For countries with a relatively high proportion of coal-fired power units, the implementation of flexibility transformation is one of the key means to enhance the flexibility of the power system. However, the role and operation mode of the system have changed after the unit transformation, and the original modeling method and scheduling strategy are no longer applicable. This paper proposes an optimized dispatching method for the electro-thermal energy integrated system considering the flexibility and transformation of thermal power differentiation. Firstly, the related technologies and characteristics of the flexible transformation of the two types of thermal power units are compared and analyzed. The apex-convex combination method is used to uniformly model the multi-stage peak shaving of the pure condensing unit and the multi-mode operation process of the cogeneration unit. Secondly, with the minimum total operating cost of the system as the objective function, and the electricity and heat balance, unit operation mode, unit climbing and start-up and stop as constraints, a mixed integer programming model for optimal dispatching of electro-thermal energy integrated systems is established. Finally, an example is used to verify the validity and applicability of the model. The results show that the model proposed in this paper can greatly improve the wind power accommodation capacity of the system, reduce the operating cost of the system, and can effectively reduce the peak load of the power grid in the "Three North" area.

Key words: flexibility retrofit, electro-thermal energy integrated system, optimal scheduling, mixed-integer programming

中图分类号:

TM721

徐姗姗, 郭通, 王月, 李永刚. 大规模火电灵活性改造背景下电—热能源集成系统优化调度[J]. 电力建设, 2021, 42(5): 27-37.

XU Shanshan, GUO Tong, WANG Yue, LI Yonggang. Optimal Scheduling of Electro-Thermal Energy Integrated System Under the Background of Flexibility Retrofit of Thermal Power Unit[J]. ELECTRIC POWER CONSTRUCTION, 2021, 42(5): 27-37.

图/表 13

表1 CHP机组改造技术对比

Table 1 Comparison of retrofit techniques for CHP units

图1 CHP机组切缸改造示意图

Fig.1 Schematic diagram of CHP unit cutting off low pressure cylinder

图2 火电机组多阶段调峰

Fig.2 Multi-stage peak regulation of a thermal power unit

图3 CHP机组的多运行模式示意图

Fig.3 Diagram of multiple operation mode of a CHP unit

图4 供热期电、热负荷及风电预测数据

Fig.4 Forecast data of load and wind power during heating period

图5 非供热期电负荷及风电预测数据

Fig.5 Forecast data of load and wind power during non-heating period

表2 3种模式下各项年成本对比

Table 2 Comparison of annual costs under the three modes 万元

图6 全体热电机组热功率

Fig.6 Thermal power of thermal power unit

图7 3种模式下同一台机组电、热功率

Fig.7 Electric and thermal power of the same unit in three modes

图8 模式3中火电机组电功率、蓄热罐蓄热量以及电锅炉电功率功率曲线

Fig.3 Electric power of the thermal power unit and heat accumulator and electric power of electric boiler in mode 3

图9 非供热期VRE削减

Fig.9 VRE reduction during non-heating period

图10 热电机组运行曲线

Fig.10 Operation curve of thermal power unit

图11 5种模式下VRE削减

Fig.11 VRE reduction in five modes

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