大容量跨区送电火电机组厂用电源切换方案  

Auxiliary power supply changeover scheme for the cross-regional power transmission of large capacity thermal power unit

作　　者：朱皓 

机构地区：[1]陕西能源赵石畔煤电有限公司,陕西榆林719000

出　　处：《华电技术》2016年第4期37-39,79,共3页HUADIAN TECHNOLOGY

摘　　要：我国现有六大区域电网交流未联网,各电网分别以各自的频率运行。火电厂若跨区域送电,会存在厂用工作电源和备用电源不同网无法并联切换的问题。分析了厂用电源切换困难的原因,提出了电厂设计时将启动备用变压器电源从升压站母线引接或发电机出口设置断路器等措施。对已建成电厂,两个厂用电源来自两个区域电网时,可将厂用工作、备用电源开关接入同期装置,启、停机时发电机带厂用电运行作为中间环节,完成厂用电源的并列切换。There are six independent regional power grids in China,which are running at their respective frequencies. In order to realize the cross-regional power transmission of thermal power plant,the parallel change over problem should be solved,which is because of the different grids between the auxiliary working power supply and stand by power supply. This paper analyzed the reasons that caused the difficulty of auxiliary power supply change over,and proposed some measures of leading the power supply of standby transformer from the busbar of booster station or adding generator circuit breaker at the power plant design process. For the built power plants,the two auxiliary power supplies are from two regional power grids,it could realize the parallel changeover of auxiliary power supply through adding synchronizing devices for the switches of auxiliary working power supply and stand by power supply,and taking the generator operation with auxiliary power supply as intermediate link when the unit is starting up or shutting down.

关 键 词：电网 差频电源 厂用电切换 启备变电源 发电机出口断路器 

分 类 号：TM621[电气工程—电力系统及自动化]