含风电并网的热电联合优化调度

发布时间：2018-03-11 12:31

本文选题：热电联产机组　切入点：风力发电　出处：《华北电力大学(北京)》2017年硕士论文　论文类型：学位论文

【摘要】：我国“三北”地区能源结构以煤电为主,包含了国家规划的多个大型风电基地,严重缺乏调节性能好的调峰电源,煤电机组中又存在大量热电联产(Combined Heat and Power,CHP)机组工作在“以热定电”的热电耦合运行模式,造成了电力系统调峰能力不足,难以应对大规模风力发电并网带来的随机性、波动性、间歇性问题,电力系统运行平稳性与安全性受到严重冲击,电网存在大量弃风情况及安全隐患。为了促进“三北”地区可再生能源的安全高效利用,本文从电力系统与热力系统联合协调调度的角度出发,开展了含风电并网的热电联合优化调度研究。首先,本文介绍了CHP机组的特性,以系统总煤耗最小为优化目标,构建了含风电并网的热电联合优化调度模型,综合考虑了热电联合系统的多种运行约束。提出了基于热电厂运行特性的网厂协调优化调度方案,并通过遗传算法进行求解。仿真结果表明,所提出的方案可以有效地解决多区域热电联合优化调度问题,充分发掘了CHP机组的调峰能力,为开展热电解耦的研究奠定了基础。其次,目前国家鼓励推行使用风电供热技术实现热电解耦来促进消纳弃风,本文以系统总煤耗最小为优化目标,构建了某地区包含风电供热的热电联合优化调度模型,通过网厂协调优化调度方案进行求解。基于调度结果计算了风电供热的综合效益及各利益体效益,实现了风电供热容量的优化配置。仿真结果表明,风电供热可以提高风电消纳率,降低电力系统运行成本与煤炭消耗,验证了风电供热最优容量选择方法的有效性与合理性。但是在当前集中调度、独立核算的电力体制下,风电供热的实施需要借助各项政策与补助的激励,难以得到大规模应用。最后,针对能有效消纳弃风的风电供热难以大规模推广应用的问题,本文引入了虚拟电厂(Virtual Power Plant,VPP)概念,提出了将一定供热区域内的大型热电厂、可再生能源聚合成VPP参与大电网运行,并加入风电供热作为热负荷侧可调度资源。以VPP日运行效益最大化为优化目标,构建了含风电供热的VPP热电负荷优化调度模型,通过自适应免疫遗传算法进行求解。仿真结果表明,使用风电供热实现VPP内的热电解耦,可以有效减少VPP的出力偏差和环保代价,提高经济效益,同时相对于单独核算各利益体效益来说,VPP作为一个利益整体具有经济性优势,有利于促进风电供热的实施及新能源的并网消纳。
[Abstract]:The energy structure of the "three north" regions of China is dominated by coal and electricity, which includes many large wind power bases planned by the state, and is seriously short of peak-shaving power sources with good regulating performance. There are also a large number of cogeneration Heat and power CHP units working in the thermoelectric coupling operation mode, which results in insufficient peak-shaving capacity of power system, which is difficult to cope with the randomness and volatility brought by large-scale wind power generation. Intermittently, the stability and safety of the power system are seriously affected, and there are a large number of abandoned wind conditions and safety risks in the power grid. In order to promote the safe and efficient utilization of renewable energy in the "three north" areas, In this paper, from the point of view of the joint coordinated dispatching of power system and thermal system, the research on the joint optimal dispatching of heat and power with wind power connected to the grid is carried out. Firstly, the characteristics of the CHP unit are introduced, with the minimum total coal consumption of the system as the optimization objective. In this paper, a combined optimal scheduling model of heat and power plants with wind power connected to power grid is constructed, and a coordinated optimal scheduling scheme based on the operation characteristics of thermal power plants is proposed, which considers a variety of operation constraints of the combined heat and power systems. The simulation results show that the proposed scheme can effectively solve the multi-area heat and power joint optimal scheduling problem and fully explore the peak-shaving ability of the CHP unit. It lays a foundation for the research of thermoelectric decoupling. Secondly, at present, the state encourages the use of wind power heating technology to realize thermoelectric decoupling to promote the absorption and abandonment of wind. The aim of this paper is to minimize the total coal consumption of the system. In this paper, a heat and power joint optimal dispatching model including wind power supply in a certain area is constructed and solved by coordinated optimal dispatching scheme of network factory. Based on the dispatching result, the comprehensive benefit and benefit of each benefit of wind power heating are calculated. The simulation results show that wind power heating can increase the wind power absorption rate, reduce the power system operation cost and coal consumption. The validity and rationality of the optimal capacity selection method for wind power supply are verified. However, under the current centralized dispatching and independent accounting electric power system, the implementation of wind power heating needs the encouragement of various policies and subsidies. It is difficult to get large-scale application. Finally, aiming at the problem that it is difficult to promote large-scale application of wind power supply which can effectively absorb and discard wind power, this paper introduces the concept of Virtual Power Plan VPPin virtual power plant, and puts forward the idea that large thermal power plants in a certain heating area should be used. Renewable energy is aggregated into VPP to participate in the operation of large power grid, and wind power supply is added as the dispatching resource of heat load side. Aiming at maximizing the daily operation benefit of VPP, the optimal dispatching model of VPP thermoelectric load with wind power supply is constructed. Through adaptive immune genetic algorithm, the simulation results show that using wind power supply to realize thermoelectric decoupling in VPP can effectively reduce the output deviation and environmental protection cost of VPP, and improve economic efficiency. At the same time, VPP, as a whole, has economic advantages compared with the benefits of individual accounting, which is helpful to promote the implementation of wind power heating and the new energy grid absorption.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM614

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