提高西北新甘青750kV送端电网安全稳定水平的无功补偿措施研究

Research on Reactive Compensation Strategies for Improving Stability Level of Sending-end of 750 kV Grid in Northwest China

针对西北750 k V送端大环网输电距离长、稳定水平低、无法满足清洁能源快速发展和外送要求的问题,研究论证了联网通道上加装串联和并联无功补偿装置的优化措施。首先从提高西北750 k V送端电网输电能力和稳定水平的角度,提出在新疆与西北主网联网第二通道上加装串联无功补偿装置的优化方案,以满足2020年规划开发的光伏和风电外送需求。然后在此基础上,针对静止无功补偿器(static var compensator,SVC)、静止同步补偿器和调相机3类并联无功补偿装置,从装置特性及模型、提升系统电压稳定性和电网输电能力、技术经济性等不同角度进行选点和选型研究,提出在柴达木站加装SVC作为推荐的配置措施。所提出的串联和并联无功补偿措施已纳入电网建设前期工作,对于保障西北电网及青藏直流安全稳定运行具有工程意义。

For the shortages of 750 kV Northwest power grids, such as long distance transmission, low stability level and being unsuitable for clean energy development and transmission, an optimal strategy by installing series and shunt reactive power compensation devices was proposed in this paper. First, series compensation was proposed to be equipped on the second Xinjiang-Northwest network channel from the aspects of improving transmission capacity and stability of the northwest 750kV sending power grid, so as to satisfy the planned wind power and solar power transmission in 2020. Besides, type and installation location selectiofls of shunt reactive power compensation devices including static var compensator （SVC）, static synchronous compensators （STATCOM） and synchronous condenser were carried out from the aspects of operation characteristics and models, ascending system voltage stability and channel transmission capacity, and technology economy. Finally, SVC equipped on Chaidamu 750 kV station was put forward as the recommended measure. The proposed series and shunt reactive compensation measures have been included in the early-stage work of power grid construction, playing an important engineering significance in improving operation safety and stability of Northwest grids and Tibetan DC.