A novel solution including classical static var compensator（SVC） associated with small static synchronous compensator（STATCOM） for overcoming the shortcoming of SVC to restrain voltage flicker is proposed. In order to avoid the problem in coordinated control between SVC and STATCOM， a strategy based on fuzzy prediction control is put forward. And separated-phase control of SVC is proposed for the conditions of unbalance system voltages. Simulation results of single-machine infinite-bus system with hybrid device verify the correctness of the proposed strategy and also demonstrate that the proposed asymmetry control method ensures safe operation of STATCOM under unbalance system.