大规模新能源并网下可能连锁故障场景及防控措施研究

发布时间：2018-05-07 07:59

本文选题：大规模新能源 + 连锁故障场景　；参考：《华北电力大学》2017年硕士论文

【摘要】：当前我国千万千瓦级风电基地以及百万千瓦级光伏发电基地不断建设,新能源装机在电网中所占比重不断增大,同时近年来国内外发生了多起含大规模新能源系统连锁跳闸的运行事故。在此背景下,本文构建大规模新能源并网下可能连锁故障场景,提取出其连锁故障发展新特征并提出相应的防控措施具有重要且现实的意义。首先,深入探讨了包括双馈风电机组与光伏发电系统在内的新能源发电模型,在此基础上,基于PSD-BPA电力系统分析仿真程序搭建了含大规模新能源的IEEE39节点系统,通过不断改变IEEE39节点系统内新能源渗透率,分别探究了新能源渗透率与系统频率稳定性、电压稳定性以及功角稳定性的关系,仿真结果表明随着新能源渗透率不断增高,系统的稳定性变差,稳定裕度降低。其次,根据系统内新能源的消纳形式将含大规模新能源的电力系统分为新能源就地消纳型和外送型两类系统。通过对现有含大规模新能源系统内连锁故障发生原因的分析以及相关理论知识,对每类系统下连锁故障的可能发展过程进行了定性分析。受此启发,通过大量的仿真计算工作构建了每类系统下可能连锁故障场景。通过对连锁故障场景的梳理与分析,经与不含新能源电网对比,提出了大规模新能源并网下连锁故障可能具有的三个新特征。最后,综合考虑大规模新能源并网下连锁故障发展的新特征、新能源机组的故障穿越能力以及相关技术规定,提出可以通过采用改变风机电压及频率保护的整定值或者增加延时的方法,防止发生大面积新能源机组脱网,预防连锁故障的发生,并通过实际电网仿真验证了所提措施的有效性。
[Abstract]:At present, the construction of wind power bases of ten million kilowatts and photovoltaic power generation bases of one million kilowatts in our country is continuing, and the proportion of new energy installed in the power grid is increasing. At the same time, in recent years, there have been many operation accidents with large scale new energy system chain tripping at home and abroad. Under this background, it is very important and realistic to construct a large-scale new energy source and possible cascading fault scene under the net, extract the new characteristics of its cascading fault development and put forward the corresponding prevention and control measures. Firstly, the new energy generation model, including doubly-fed wind turbine and photovoltaic power generation system, is deeply discussed. Based on this, a IEEE39 node system with large-scale new energy is built based on PSD-BPA power system analysis simulation program. By continuously changing the new energy permeability in the IEEE39 node system, the relationship between the new energy permeability and the system frequency stability, voltage stability and power angle stability is explored, respectively. The simulation results show that the new energy permeability increases with the increase of the new energy permeability. The stability of the system becomes worse and the stability margin decreases. Secondly, according to the absorption form of new energy in the system, the power system with large-scale new energy can be divided into two types: new energy in-situ absorption type and outgoing type. Based on the analysis of the causes of cascading faults in existing large-scale new energy systems and related theoretical knowledge, the possible development process of cascading faults in each type of system is qualitatively analyzed. Inspired by this, the possible cascading fault scenarios under each kind of system are constructed through a lot of simulation work. By combing and analyzing the scenario of cascading faults, and comparing with the grid without new energy, three new characteristics of large-scale new energy and offline cascading faults are put forward. Finally, considering the new characteristics of large-scale new energy and offline cascading fault development, the fault traversing capacity of new energy units and related technical regulations, It is put forward that by changing the setting value of fan voltage and frequency protection or increasing delay time, it can prevent a large area of new energy generating units from getting off the grid and prevent the occurrence of cascading faults. The effectiveness of the proposed measures is verified by the actual power grid simulation.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM732

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