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北京通州配电网合环操作研究

发布时间:2018-07-11 16:21  文章来源:笔耕文化传播

  本文选题:合环电流 + 电压差 ; 参考:《华北电力大学》2014年硕士论文


【摘要】:随着首都电力系统电网结构的不断完善,电力运行方式的日趋灵活,电力用户服务水平稳步提升。为了进一步提高首都配电网的可靠性,降低网损,提高网络的负载能力和利用效率,使互供能力更强,建立环网供电为主的网络结构是必然趋势,使配网网络能满足各种运行方式的需要。 配电网进行合环操作时两侧电源一般处于分裂运行状态,常常因合环点开关两侧母线或线路电压差的存在,使合环操作中产生的环流过大引起过流保护误动。为了保证重要用户的不间断供电,了解配网潮流的变化情况,避免不必要的过负荷或者意外事故,需要对合环电流进行详细的分析和计算,有助于运行人员对地区电力网络的运行方式进行适当的调整,从而保证用户利益,减少停电损失。 本文结合配电网的基本结构和配电网的运行方式的特点,一一列举了合环操作的种类,合环操作的优势和潜在的风险问题。以电网潮流计算方法、合环稳态电流计算方法、暂态电流计算方法、短路电流计算方法为理论依据,选取北京通州典型配网案例进行分析。 伴随北京通州区作为“首都副中心”的高速建设,提高电网供电能力和电力保障水平都尤为重要,结合工作实际,从地区现状和电力用户需求着手,依托通州电网“网格化”配网规划,通过10kV配网合环,网架结构趋于合理,供电半径大大缩短,将有效降低线路损耗,对地区节能减排将产生较大的正面推进作用,进而提高供电可靠率,改善通州地区人居环境。 通州龙湖开闭站由于两个上级电源接地方式不同,10kV侧合环操作将造成较大合环电流,因此,选取龙湖开闭站作为典型案例。通过对合环稳态电流、合环暂态电流的计算分析以及合环运行下该开闭站母线、馈线发生接地故障时的电网潮流以及负荷分配的逐一梳理分析,从而判断合环电流对调度运行、继电保护的影响并采取相应措施。
[Abstract]:With the continuous improvement of the power network structure of the capital electric power system and the increasingly flexible operation mode of the power system, the service level of the electric power users is steadily improved. In order to further improve the reliability of the capital distribution network, reduce the network loss, improve the load capacity and utilization efficiency of the network, and make the mutual power supply ability stronger, it is an inevitable trend to establish a network structure dominated by power supply in the ring network. The distribution network can meet the needs of various operation modes. The power supply on both sides of the distribution network is generally in a split state when it is operated by a closed loop, and the overcurrent protection is often misoperated due to the existence of the busbar or line voltage difference between the two sides of the closing point switch, and the circulation generated in the closed loop operation is too large. In order to ensure uninterrupted power supply for important users, to understand the change of distribution network power flow and to avoid unnecessary overload or accidents, it is necessary to analyze and calculate the involutive loop current in detail. It is helpful for operators to adjust the operation mode of local electric power network properly, so as to ensure the interests of users and reduce the loss of power cut. Combined with the basic structure of distribution network and the characteristics of distribution network operation mode, this paper enumerates the types of closed loop operation, the advantages and potential risks of closed ring operation. Based on the theoretical basis of power flow calculation method, closed loop steady state current calculation method, transient current calculation method and short-circuit current calculation method, a typical case of Tongzhou distribution network in Beijing is selected for analysis. With the high speed construction of Tongzhou District as the "capital sub-center", it is particularly important to improve the power supply capacity and the power security level of the power network. In combination with the actual work, starting from the current situation of the region and the demand of electric power users, Relying on the "grid" distribution planning of Tongzhou Power Grid, the grid structure tends to be reasonable and the power supply radius is greatly shortened through the 10 kV distribution ring, which will effectively reduce the line loss and will have a greater positive role in promoting energy saving and emission reduction in the region. And then improve the reliability of power supply, improve the living environment in Tongzhou area. In Tongzhou Longhu open and close station, because of the different earthing modes of two higher power sources, 10kV side closing current will be caused. Therefore, the Longhu open and close station is selected as a typical case. Through the calculation and analysis of the involutive loop steady current, the transient current of the closed loop and the busbar of the open and close station under the closed loop operation, the grid power flow and load distribution in the case of grounding fault of the feeder line are analyzed one by one, so as to judge the operation of the closed loop current to the dispatching. The influence of relay protection and corresponding measures are taken.
【学位授予单位】:华北电力大学
【学位级别】:硕士
【学位授予年份】:2014
【分类号】:TM732

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