Abstract
In this paper presents a direct power control (DPC) for three-phase matrix converters operating as uni fied power flow controllers (UPFCs). Matrix converters (MCs) allow the direct apower conversion without dc energy storage lin ks; therefore, the MC-based UPFC (MC-UPFC) has reduced size and cost, reduced c apacitor power losses, together with higher reliabi lity. Theoretical principles of direct power control (DPC) based on sliding mode control methods are established for an MC-UPFC dyn amic model including the input filter. As a result, line active and reactive power, together with ac supply reactive power, can be directly controlled by selecting an appropriate matrix converter switching state ass uring good steady-state and dynamic responses. Expe rimental results of DPC controllers for MC-UPFC show decoupled active and r eactive power control, zero steady-state tracking e rror, and fast response times. Compared to an MC-UPFC using active and reac tive power linear controllers based on a modified V enturini high-frequency PWM modulator, the experimental results of the adva nced DPC-MC guarantee faster responses without over shoot and no steady-state error, presenting no cross-coupling in dynamic and steady-state responses.
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