低压减载在电力系统电压稳定性中的应用研究

发布时间：2018-11-22 11:34

【摘要】：如何抑制电力系统电压崩溃对整个电网都有着至关重要的作用。而低压减载是维持电压稳定的有效手段,合理有效的选择切负荷节点,可以使整个网络在较短时间内回到稳定运行的状态,进而保护整个电网的稳定运行。本文首先从电力系统电压稳定特性出发,介绍了相应的特性原理,进而结合常用的分析指标,比较不同指标的试用范围和优缺点。以此为依据,进一步探讨低压减载的设计方案,从作用机理入手,通过数学方法对低压减载的原理进行描述,同时结合一般准则,按照不同的故障类型进行考虑,进行配置设计。最后通过天津电网进行实例分析,从指标分析电压稳定性,当仿真模拟算例验证,证明了该方法保证了系统电压快速恢复和较高的稳定裕度,同时验证了该方法的合理性和有效性。本文在国外研究的基础上,分析国外的优秀经验,同时对国内的现状进行初步探讨,指出了低压减载的重要性以及我国现阶段的不足。无论是离线还是整定上,都和优秀先进的技术存在差距,因此需要进一步提升。在此基础上,提出了本文的研究内容和相应的研究方法;通过稳定性原理分析,结合相应的数学理论,对电压稳定性进行了一个较为全面的介绍,也对低压减载的进一步分析打下基础;在电压稳定性原理明确的基础上,对低压减载进行细致全面的讨论,研究了相应的判定依据和选定方法,提出了相应的配置思想,给出简单的设计方案;最后结合天津地区实际电网进行分析,给出常见的指标体系,同时结合实际仿真对叙述的方法进行实例计算。
[Abstract]:How to suppress the voltage collapse of power system plays an important role in the whole power system. Low voltage load reduction is an effective means to maintain voltage stability. Reasonable and effective selection of load shedding nodes can make the whole network return to stable operation state in a short time and then protect the stable operation of the whole power network. Based on the voltage stability characteristics of power system, this paper first introduces the principle of the characteristics, and then compares the trial range, advantages and disadvantages of the different indexes with the commonly used analysis indexes. Based on this, the design scheme of low voltage load reduction is further discussed. The principle of low voltage load reduction is described by mathematical method. At the same time, combined with general criteria, different fault types are considered. Carry out configuration design. Finally, through the example analysis of Tianjin power network, the voltage stability is analyzed from the index. The simulation example proves that this method ensures the rapid recovery of the system voltage and the high stability margin. At the same time, the rationality and validity of the method are verified. On the basis of foreign research, this paper analyzes the excellent experience of foreign countries, discusses the present situation in China, and points out the importance of low pressure load reduction and the deficiency of our country at present. Both offline and tuning, there is a gap with excellent advanced technology, and therefore need to be further improved. On this basis, the research content and corresponding research methods are put forward. Through the stability principle analysis and the corresponding mathematical theory, the voltage stability is introduced comprehensively, and the foundation for the further analysis of the low voltage load reduction is also laid. On the basis of the clear principle of voltage stability, the paper discusses the low voltage load reduction carefully and comprehensively, studies the corresponding decision basis and selection method, puts forward the corresponding configuration idea, and gives a simple design scheme. Finally, based on the analysis of the actual power grid in Tianjin area, the common index system is given. At the same time, the example calculation of the described method is carried out in combination with the actual simulation.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM712

【参考文献】