A Novel Control Strategy for Direct Power Control with MC-Based UPFC
Journal Title: International Journal of Modern Engineering Research (IJMER) - Year 2013, Vol 3, Issue 6
Abstract
This paper presents a novel control strategy for direct power control with MC-based UPFC. In general power control techniques are two methods; first one is a well-known method of indirect active and reactive power control is based on current vector orientation with respect to the line voltage vector [voltage-oriented control (VOC)]. Another less known method based on instantaneous direct active and reactive power control is called direct power control (DPC).A new simple method of line voltage sensor less DPC with constant switching frequency using space-vector modulation (DPC-SVM) is presented. DPC is based on the instantaneous active and reactive power control loops. Therefore, the key point of the DPC implementation is a correct and fast estimation of the active and reactive line power. A direct power control (DPC) for three-phase matrix converters operating as unified power flow controllers (UPFCs). Matrix converters (MCs) allow the direct ac/ac power conversion without dc energy storage links; therefore, the MC-based UPFC (MC-UPFC) has reduced volume and cost, reduced capacitor power losses, together with higher reliability. Theoretical principles of direct power control (DPC) based on sliding mode control techniques are established for an MC-UPFC dynamic model including the input filter. The simulation result of MC-based UPFC line active and reactive power, together with ac supply reactive power can be directly controlled by selecting an appropriate matrix converter switching state guaranteeing good steady-state and dynamic responses. Finally proposed Fuzzy controller forces the amplitude of the output current space vector to be constant so that the output current is free of harmonic
Authors and Affiliations
K. Raju
Keywords
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