基于储热的热电厂消纳风电方案研究

发布时间：2018-02-09 06:44

本文关键词： 储热风电消纳调峰电热综合调度运行策略　出处：《大连理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：当前,在我国“三北”地区冬季供暖期,因“风热冲突”所导致的弃风现象越来越严重,已经成为全社会关注的问题。冲突的原因在于热电联产机组为保证供热而不得不大幅提高其最小出力,进而导致风电的上网空间不足。为此,本文提出了在我国热电厂中通过配置储热装置来降低弃风时段最小出力,进而消纳风电的方案。论文的主要工作内容及成果如下：首先,为验证方案的技术可行性,分析了我国抽汽式机组配置储热后的调峰能力。首先,对配置储热后热电机组的电热运行外特性进行了建模；进而,讨论了其运行策略；在此基础上,建立了计算配置储热后热电机组调峰容量的数学模型；最后,利用该模型对我国北方地区典型的300MW和200MW供热机组配置储热提高调峰能力的效果进行分析,结果表明：在给定的供热中期热负荷水平下,配置储热可使得2台机组的调峰容量分别提高额定容量的21%和13%,从而为弃风电力提供大量的上网空间。然后,为适应我国集中调度的电力运营环境,建立了含储热的电力系统电热综合调度模型。与传统模型相比,新模型增加了系统热平衡约束、热电机组的热电耦合约束、储热装置运行约束等；目标函数扩展为供电和供热总煤耗最低。算例对模型的有效性进行了验证,并表明,在热电厂中配置储热可有效提高电网的风电消纳水平,且消纳单位电量风电的节煤量要高于电锅炉消纳方案。最后,为制定考虑风电不确定性的蓄热罐运行策略,建立了基于场景分析的含储热优化调度模型,利用场景分析方法描述风电的不确定性,以各场景下系统煤耗量的期望值作为目标函数；鉴于模型的复杂性,为简化计算,提出一种实用化方法,该方法对不同场景分别进行电热综合调度确定备选的运行策略,然后建立“节煤量”指标对各策略进行评价,最后选择“节煤量”最大的策略作为蓄热罐的次日运行策略；算例对以上两种方法的有效性进行验证,并表明,实用化方法与基于场景的优化调度所得到的结果基本相同。上述研究表明,在我国热电厂中配置储热是促进风电、热电友好协调发展的有效手段,可有效缓解当前“风热冲突”问题,为我国解决弃风问题提供了一种可行方案。
[Abstract]:At present, during the winter heating period in the "three north" areas of China, the phenomenon of abandoning the wind caused by the "wind-heat conflict" is becoming more and more serious. It has become a problem of concern to the whole society. The reason for the conflict lies in the fact that cogeneration units have to greatly improve their minimum capacity to ensure heat supply, which in turn leads to a lack of space for wind power to connect to the Internet. In this paper, a scheme is proposed to reduce the minimum output force of abandoned air period and then absorb wind power by installing heat storage device in the thermal power plant of our country. The main contents and results of this paper are as follows:. First of all, in order to verify the technical feasibility of the scheme, the peak shaving capacity of the steam extraction unit after heat storage is analyzed. Firstly, the external characteristics of the thermal power unit with heat storage are modeled, and the operation strategy is discussed. On this basis, a mathematical model for calculating the peak capacity of thermal power units with heat storage is established, and finally, the effect of heat storage on the peak shaving capacity of typical 300MW and 200MW heating units in northern China is analyzed. The results show that under a given heat load level in the medium term, the peak load of two units can be increased by 21% and 13, respectively, which provides a large amount of network space for the abandoned wind power. Then, in order to adapt to the electric power operation environment of centralized dispatching in our country, the electric heat comprehensive dispatching model of power system with heat storage is established. Compared with the traditional model, the new model adds the system heat balance constraint and the thermoelectric coupling constraint of the thermoelectric unit. The objective function is extended to the lowest total coal consumption of power supply and heating. The validity of the model is verified by an example, and it is shown that the allocation of heat storage in the thermal power plant can effectively improve the wind power consumption level of the power network. The coal consumption per unit charge of wind power is higher than that of electric boiler. Finally, in order to make the operation strategy of storage tank considering the uncertainty of wind power, the optimal scheduling model with heat storage based on scenario analysis is established, and the uncertainty of wind power is described by scenario analysis method. In view of the complexity of the model and the complexity of the model, a practical method is proposed, which determines the alternative operation strategy for the different scenarios, which is based on the expected value of the coal consumption of the system under different scenarios, and in view of the complexity of the model, in order to simplify the calculation, a practical method is proposed. Then the index of "saving coal" is established to evaluate the strategies, and the strategy of "saving coal" is chosen as the next day operation strategy of the storage tank. The effectiveness of the above two methods is verified by an example, and the results show that, The practical method is basically the same as the optimal scheduling based on scenario. The above research shows that the allocation of heat storage in the thermal power plants in China is an effective means to promote the friendly and coordinated development of wind power and thermal power, which can effectively alleviate the current "wind and heat conflicts" and provide a feasible scheme for solving the problem of abandonment of wind in our country.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM621

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