某地区电网规划及发电厂电气部分

某地区电网规划及发电厂电气部分摘要此次的是按照每日任务书本上提供的数据新创建一个火力发电发电站，首先明确火电厂电动机的参数和型号规格，及其电气设备主接线，选择满足条件的降压变压器以及各种技术参数。通过简单的潮流计算选择各电力线的横截面，根据无功功率计算每个节点的赔偿容积。制订2个电网接线方案，通过比较2个方案的技术可行性和经济合理性来决定方案。最终，对新创建火电厂开展短路电流计算及其选择一次设备然后进行校检。关键词：电气主接线：无功平衡：潮流计算：短路计算：电气设备的选择Power grid planning and electrical part of power plant in acertain areaMajor:Electrical Engineering and AutomationStudent:Xue Xinfa Supervisor:AbstractThis time,a new thermal power station is created according to the data provided in the dailytask book.First,the parameters and model specifications of the motor in the thermal power plant,as well as the main wiring of its electrical equipment,and the step-down transformer and varioustechnical parameters that meet the conditions are defined.Select the cross section of each powerline through simple power flow calculation,and calculate the compensation volume of each nodeaccording to reactive power.Formulate two power grid connection schemes,and determine thescheme by comparing the technical feasibility and economic rationality of the two schemes.Finally,carry out short-circuit current calculation and select primary equipment for the newlybuilt thermal power plant and then conduct calibration.Key words:main electrical wiring;Reactive power balance;Power flow calculation;Shortcircuit calculation;Selection of electrical equipment目录1.绪论1.1.电力系统概念.1.2.毕业设计思路2.火电厂发电机、电气主接线和升压变压器确定.…2.1.火电厂发电机的选择…2.2.电气主接线的确定.22.2.1.电气主接线的要求….22.2.2.主接线的设计….22.2.3.火电厂主接线的确定..32.2.4.确定方案….42.3.升压变压器的确定…...43.制定无功平衡方案并计算个节点补偿容量.43.1.变电站A无功平衡及补偿容量.….43.2.变电站B无功平衡及补偿容量.53.3.水电厂无功平衡及补偿容量.…..63.4.火电厂无功平衡及补偿容量.3.4.1.火电厂供石岗变总功率73.4.2.火电厂外送功率3.4.3.火电厂送供大系统总功率.73.5.大系统无功平衡及补偿容量84.拟定地区电网接线方案.。84.1.电网接线方案….84.2.各方案的潮流计算..84.2.1.方案1的潮流计算84.2.2.方案2的潮流计算….124.3.各方案输电线路截面计算及校验.134.3.1.方案1输电线路截面计算及校验。.144.3.2.方案2输电线路截面计算及校验…164.4.通过技术和经济的比较确定方案.…..164.4.1.技术比较.164.4.2.经济比较.。175.短路电流计算..175.1.概述.175.2.短路电流计算的方法.175.3.短路点的选择、短路电流以及冲击电流的计算..176.火电厂一次设备的选择.186.1.火电厂一次设备选择的一般条件…186.1.1.按正常工作条件选择186.1.2.按短路条件进行校验….196.2.电气设备的选择.…6.2.1.系统各个回路的最大工作电流6.2.2.高压断路器的选择6.2.3.高压隔离开关的选择…236.2.4.互感器的选择..256.2.5.母线的选择.….26参考文献.29致谢.30