Network reactive partitioning is an important measures to improve the robustness and flexibility of reactive power management in large-scale power grids.Although the method based on complex network community structure provides a convenient and efficient algorithm for solving the NP problem of network partitioning

yet this kind of method does not effectively deal with the capacity constraints of var sources.Therefore

the problem that the partitioning result is not in agreement with voltage control requirement exists.For solving this problem

in this paper

the control sensitivity matrix of var source to suppress the influence of reactive power change of load nodes is set up firstly.Then

the pre-partitioning method

considering the capacity constraints and coupling degree of var source

is given so to avoid too large initial partitions which exceed reactive control ability.After that

a revised modularity with reactive power transmission efficiency as weight is proposed to quantify the degree of reactive power balancing and to avoid the occurrence of longdistance reactive transmission within sub regions.Finally

the effectiveness of the proposed method is verified in the planning scheme.It is shown by the calculation example that the partitioning result proposed in this paper is more reasonableis helpful to guide planning and construction of var source of actual power grid in the future.