混合型SVC在藏中电网中的应用

摘要

In view of lower transmission capacity of Qinghai-Tibet direct current (DC) initial stage of production and the current situation of unstable risk of voltage and frequency existing in central Tibet power grid, the static var compensator (SVC) was proposed to install in central Tibet power grid to improve the transmission capacity in Qinghai-Tibet HVDC project and to inhibit the fluctuation of voltage and frequency effectively in power system faults. The capacity configuration and voltage level of SVC were demonstrated and a configuration scheme suitable for the project with low cost was proposed. This paper analyzed the operation characteristics of SVC in the operation and outage of Lhasa oil-fired power plant by system simulation. The results indicate that the configuration scheme of SVC can enhance the stabil-ity of system in faults and improve the transmission capacity of Qinghai-Tibet HVDC project obviously.%针对青藏直流投产初期输电容量较低和藏中电网存在电压和频率失稳风险的现状，提出在藏中电网装设静止无功补偿器SVC来提高青藏直流输电能力和抑制系统故障时电压和频率的波动。对SVC的配置容量、电压等级进行了论证，提出适合工程且较省费用的SVC配置方案。通过系统仿真，对SVC在拉萨燃机电厂开机和停运时的运行特性进行了分析。结果表明，提出的SVC配置方案可增强系统故障时的稳定性，能明显提高青藏直流的输送容量。