Sufficient reactive power compensation is the effective measure to assure both operation stability and safety of multi-DC receiving end. A kind of comprehensive evaluation index is proposed in this paper for optimization control sorting of the reactive output of generator near the DC drop point and

on this basis

the coordination control and optimization method of reactive power device in the DC receiving end grid is developed. Firstly

the influence of different ratio of multi-reactive power devices on transient voltage stability is analyzed when the receiving end grid is in steady operation. Then

the coordination control and optimization method of multiple reactive device is developed in accordance with the dynamic reactive power index of generator and the optimization selection index of the generator with purpose of reasonably using existing reactive power device to improve grid voltage stability of the receiving end. It is shown by the simulation result that

compared with the existing operation mode of central chian power grid

the method proposed in this paper not only strengthens the impact resistance ability of the receiving end grid

but also reduces the rotation reserve capacity near the drop point area as well as has perfect economic performance.