Static var generator（SVG）is presently the most advanced reactive power compensation device.However

it has such features as strong nonlinearity

strong coupling and difficult realization in engineering design and

furthermore

in the practical engineering application

the compensation device is easy to be influenced by the parameters of the elements and external disturbance and therefore the reactive power compensation result of the device is affected. In this paper

a novel double closed-loop control strategy of a SVG is proposed with the mathematic model under dq coordinate system as base

in which voltage outer loop is controlled by sliding model and current inner loop by feed-forward decoupling control strategy. The simulation model of the system is built by Matlab/Simulink and it is shown by the simulation result that the control strategy is novel

clear and easy to achieve in the design concept

and the control system has strong robustness and dynamic performance.