针对传统九区图自动电压控制策略中关口无功控制范围的整定无法适应运行方式变化的问题，分析了 110 kV 电网的有功损耗与关口无功的关联特性，提出了“定 ΔP法”的关口无功趋优控制策略以及“趋优网损增量 ΔP”的整定依据，通过参数边界条件化的方法，对 110kV 变电站关口无功优化区间进行分析，得到了适应不同运行方式的关口无功差异化控制范围，并通过评价模型对相关控制区间进行了定量评价． 算例证明，所提方法能够提高电力系统运行的经济性和安全性，而且易于实现．

As the reactive power control range of gateway in the traditional nine-zone automatic voltage control (AVC) strategy cannot adapt to the changes of operation modes,the correlation characteristic between the active loss and the reactive power of gateway in a 110 kV power grid is analyzed,and an optimization-oriented control strategy of the reactive power of gateway and a setting basis of the optimization-oriented network loss increment ΔP are proposed.Then,the reactive optimization interval of a 110 kV power grid gateway is discussed by using the boundary conditioned parameter,and a differential reactive power control range of gateway,which can adapt to dif- ferent operation modes,is obtained.Moreover,the relevant control range is quantitatively assessed by using an e- valuation model.Case analysis shows that the proposed method can improve the economy and safety of power sys- tems and is easy to implement.