Control Strategy of UPFC Based on Power Coordination

For the influence of active and reactive power to the series and parallel converter of unified power flow controller( UPFC) in the process of power lines flow regulation,the state feedback decoupling control model of series and parallel converter is established,and power coordinate control strategy for UPFC by analyzing UPFC mathematical equations is proposed,through analyzing DC voltage stability condition from the point of power balancing and to increase the active current feed forward component under the DC capacitor voltage balancing control link,achieving dynamic stability control of series and parallel converter to capacitor voltage. The series converter power control loop based on decoupling control strategy are designed,and active and reactive independently controlled effect to UPFC in the process of power flow regulation are achieved. The effectiveness and feasibility of the control strategy in the regulation of power flow is verified by simulation results.