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This paper demonstrates the capability of a solid-state transformer (SST) to improve the power quality of the distribution system. The three-stage 11 kV/400 V, 300 kVA, 3-phase SST discussed in this article comprises a cascaded multilevel converter-based ac/dc converter, multiple-active-bridge (MAB) converter with a high-frequency transformer acting as an isolated dc/dc converter, and a dc/ac inverter. The paper shows by simulation that the SST can address many of the power quality problems caused by grid irregularities such as voltage sag, swell, and harmonic distortion, which can cause voltage instability to the load and over-voltage across power devices, without the need for other traditional compensating devices as harmonic filters or dynamic voltage regulators (DVRs). Furthermore, the SST can offer reactive power support to the power grid similar to that from static compensators (STATCOMs) or static VAr compensators (SVC). To demonstrate the advantages of SST when compared with th ....

Cascaded Multilevel Converter , Distribution Grid , Power Quality , Reactive Power Support , Old State Transformer , Raditional Transformer ,