关于某电厂AVC指标异常分析与无功分配策略的优化调整

Analysis of AVC Index Abnormity and Optimization of Reactive PowerDistribution Strategy in a Power Plant

针对#2机组AVC指标异常下降情况进行分析,仿真验证其为无功分配方式不合理引起,在#1机组低负荷运行工况AVC调节闭锁,AVC装置采用等功率因数无功分配策略,导致#2机组正常调节的分配无功偏少,出现指标不合格情况,需通过优化无功分配策略实现更好的适应性。当前火电机组承担电网负荷调谷角色已成常态,机组运行工况越来越复杂,通过AVC无功分配策略的及时调整,可以更好地应对电网对机组的运行调整要求,避免AVC指标考核。

The abnormal drop of AVC index of Unit#2 was analyzed,and the simulation verified that it was caused by unreasonable reactive power distribution mode.Under the low load operation condition of Unit#1,AVC regulation was blocked,and AVC device adopted the reactive power distribution strategy of equal power factor,which resulted in less distributed reactive power under normal regulation of Unit#2 and unqualified indicators.It was necessary to optimize the reactive power distribution strategy to achieve better adaptability.At present,it has become normal for thermal power units to assume the role of grid load regulation,and the operating conditions of units are becoming more and more complex.Through timely adjustment of AVC reactive power distribution strategy,it can better meet the operation adjustment requirements of power grid for units and avoid AVC index assessment.