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摘要本次设计的任务是“德江火电厂及锦顺地区电网的规划设计”,设计的内容为：选定电厂的发电机型号、参数，确定电厂的电气主接线和升压变压器台数、型号、容量、参数。制定无功平衡方案，决定各节点补偿容量。初步拟定地区电网结线方案。经过潮流计算选出各输电线的截面，计算导线的网损和电压降落。综合潮流计算结果进行经济比较，选定最优方案。对优选的锦顺地区电网进行短路电流计算。参考短路计算结果选择电气主接线中的主要设备，并进行校验。配置电网的继电保护设备。其中地区电网的功率平衡方案，潮流计算，短路计算部分是本次设计的难点和重点。这些部分的计算关系到后期所有设备的选型，通过这些计算也能发现前期选型的失误。而设备的选型往往关系到电网的可靠性，灵活性与经济性。电力系统设计的前提就是可靠性，灵活性，经济性。本次设计也是以这三点为前提来进行。46217
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毕业论文关键词：功率平衡；潮流计算；短路计算；可靠性；灵活性；经济性
Abstract
The design task is "Dejiang power plant and Jin Shun regional power grid planning and design", design content for: power plant generator model and parameters are selected to determine the power plant of the main electrical wiring and the step-up transformer units, type, capacity and parameter. Reactive power balancing scheme is developed to determine the compensation capacity of each node. Preliminary plan of regional power grid. The cross section of each transmission line is calculated by power flow calculation, and the network loss and voltage drop of the wire are calculated. Integrated power flow calculation results for economic comparison, the selected optimal scheme. Calculation of short circuit current in the selected area of Jin and shun. The main equipment of the electric main wiring is selected by the result of the calculation of the short circuit. Configuration of power system relay protection equipment. The power balance scheme, power flow calculation and short circuit calculation of the regional power network are the difficult points and key points of the design. The calculation of these parts is related to the selection of all equipment in the late period, through these calculations can also find the early selection of errors. And equipment selection is often related to the reliability, flexibility and economy of the power system. The premise of power system design is reliability, flexibility and economy.This design is based on the premise of the three points to carry out.
Key words: power balance; power flow calculation; short circuit calculation; reliability; flexibility; economy
目 录
第一章 德江火电厂与平乡水电厂发电机型号、参数的选择 1
第二章 发电厂电气主接线的选择 2
2.1德江火电厂电气主接线的选择 2
2.2平乡水电厂电气主接线的选择 2
第三章 发电厂升压变压器台数、型号、容量、参数的确定 3
3.1德江火电厂升压变压器的选择 3
3.2平乡水电厂升压变压器的选择 3
第四章 拟定地区电网结线方案 5
第五章 制定无功平衡方案，决定各节点补偿容量 7
5.1电网结线方案一的无功平衡方案与相关计算 7
5.2电网结线方案二的无功平衡方案与相关计算 10
第六章 架空线路的选择，导线的网损 13
6、1方案一架空线路导线型号的选择 13
1) 德江火电厂至乐亭变电所段架空线路导线型号选择 13
2） 德江火电厂至锦顺枢纽变电所段架空线路导线型号选择 13