针对大型水力发电厂计算机监控系统采集有、无功功率存在的问题,以洪家渡发电厂为例,说明了电网对各厂机组有、无功功率实现冗余采集的重要性。叙述了直流采样和交流采样的原理、采样过程,重点突出了计算机监控系统LCU对交流采样装置电量参数采集的实现。从而实现计算机监控系统对机组有、无功功率的冗余采集。 Aiming at the problem of collecting and reactive power in computer supervisory system of large hydroelectric power plant, taking Hongjiadu power plant as an example, the importance of power grid for redundant acquisition of reactive power of each plant is illustrated. Describes the principles of DC sampling and AC sampling, sampling process, with emphasis on computer monitoring system LCU AC sampling device to achieve the acquisition of power parameters. In order to achieve computer monitoring system on the unit, reactive power redundant acquisition.