The delivery grid of new energy often faces such problem as frequent power flow variation

large voltage fluctuation and insufficient dynamic reactive power. The traditional reactive power compensation device

in case of using in the new energy delivery

needs frequent switching

which seriously shortens the service life of the device. Therefore

the dynamic reactive power compensation device is in urgent need in this kind of occasion. However

it has large difference in such parameters aspects as overall cost

service life

response speed and overloads capacity and therefore has difficulty in selection. In view of above issues

the comprehensive evaluation index system for such types of reactive compensation devices as phase modifier

synchronous condenser

static var compensator（SVC）and static synchronous compensator（STATCOM）is proposed in this paper. The index is subject to standardized processing and the index weight of different evaluation factors is studied with combination of delivery characteristic of new energy.The optimal economy is taken as the target of evaluation system. Finally

the method is applied in the real case and the recommended scheme of dynamic reactive power compensation device for improving delivery ability of new energy is obtained.