【作者】 程淑；

【导师】 李承军；

【作者基本信息】 华中科技大学 ， 水利水电工程， 2004， 硕士

【摘要】 由于水电厂固有的运行灵活性和梯级水电厂群之间的补偿协调作用,使梯级水电厂在电力系统的运行中发挥着越来越重要的作用。梯级AGC即为梯级水电厂群的自动发电控制(Automatic Generation Control)。梯级AGC研究的目的主要是降低发电成本,提高发电效益。电力系统中,经济调度的效益相对值虽然不大,但绝对值很大,因此科学合理的进行梯级水电站优化调度具有十分重要的理论意义和广阔的应用前景。国内外学者对梯级AGC问题的研究已经进行了很长时间,也有很多目前仍然没有一套理论上严谨而又很实用的数学模型和算法,很多关于梯级优化的研究一直停留在理论研究阶段。论文的主要研究成果如下:回顾了近年来国内外学者在梯级AGC领域取得的新进展,阐述了梯级AGC的关键和存在的不足,指出了梯级AGC研究的发展趋势。从技术层面上来讲,梯级AGC问题可以分为厂内AGC和厂间AGC两个部分。针对水电厂发电量一定的前提,建立了厂内AGC的水电厂耗水量最小模型,并采用动态规划法来实现优化调度,对机组启停提出了自己的方法,即在一定的时间内水电厂负荷均满足要求方可停机,并对机组组合、机组负荷安排的优化都进行了考虑。用此方法对清江隔河岩水电厂的历史负荷做方案评价,即用电厂的历史负荷来对安排机组组合和出力,通过比较各台机组历史的和经过优化之后的状态和出力,可知该方法可以创造相当大的经济效益,具有很强的实用性。根据我国电力系统的实际情况,在各种厂间AGC准则中选择了总蓄能最大准则,并建立了相应的模型,在对准则和模型进行可行有效的简化以后,通过分析各约束条件和比较各种计算方法,选择了一种行之有效的算法——旋转方向法。该方法具有构造方向不需要占用内存的优点,计算简单快速。最后,对本文的成果进行总结,并提出了有待进一步解决的问题。更多还原

【Abstract】 Because of the flexibility of the hydraulic power plants, and the compensation and correspondence among cascade hydraulic power plants, the cascade hydraulic power plants are playing a more and more important role in the operation of the power system. The main aim of the research works on AGC (Automatic Generation Control) is to reduce the cost and improve the proficiency. In the power system, the benefit of economical dispatching is not so significant respectively, but would be a big figure absolutely. Thus, the optimized dispatching among cascade hydraulic power plants is very important theoretically and has promising application. Research works on AGC has been carried out for a long period of time, but till now, there is no mathematical model or algorithms that are both practical and precise. The research works remains on the theoretical stage.The main content of this thesis is as follows:Some new information on cascade AGC area is reviewed, some key elements and deficiency of AGC are pointed out, and the future trend of AGC is outlined.Technically, the AGC can be divided into two parts: AGC in and out of hydraulic power plants. A hydraulic power plant minimum water consumption model of plant AGC is set up, with the power generated by the plants remained constant. Dynamic programming is used in optimizing dispatching, and a new starting-stopping principle is introduced: In a certain period of time, the generator can not be stopped unless all plants have satisfactory loads. The combination of generators and loads dispatching between generators are considered and optimized. This method is used in scheme evaluation for the former loads of Qingjiang- Geheyan hydropower plants, i.e. the former loads of the plants is analyzed with this method to optimize dispatching generator combination and contribution, and then the optimized status and contribution are compared with those real value. The result of this contribution indicates that this method can lead to considerable benefit and has important value in practical operation.According to the situations in our native power system, the maximum storage rule is selected among various AGC rules. Models are set up accordingly and after simplification on rule and models, analysis on constraint conditions, and comparisons among various algorithms, an effective method-Rosenbrock method is chosen. This method has no memory requirements in calculation, and thus, is easier and faster comparatively.At last, a conclusion is drawn and some unsettled problems are mentioned.更多还原