POWER AND VOLTAGE BALANCE CONTROL OF A NOVEL THREE-PHASE SOLID STATE TRANSFORMER USING MULTILEVEL CASCADED H-BRIDGE INVERTERS FOR MICROGRID APPLICATIONS

In this project we are implementing a power and voltage balance control schemes for cascaded HBridge Multilevel Inverter (CHMI)-based Solid-State Transformer (SST) topology. Therefore the SST consists of a cascaded multilevel ac/dc rectifier, dual active bridge (DAB) converters with high-frequency transformers. The solid state transformer (SST) has the features of immediate voltage regulation, voltage sag compensation, fault isolation, power factor correction, harmonic isolation and dc output. To reduce load on the controller and simplify modulation algorithm, a masterslave control (MSC) strategy is designed for the dual active bridge (DAB) stage. Therefore in this paper we are representing the compensation strategy based on three-phase d-q decoupled current controller .By using the simulation results we can analyze that the proposed method and also the performance of the controller and its application to microgrid SST

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