Power Quality Improvement of the Distribution System using a Solid-State Transformer
Publication Name
1st IEEE Industrial Electronics Society Annual On-Line Conference, ONCON 2022
Abstract
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 the traditional transformer, various simulations using the MATLAB/Simulink platform have been carried out. Simulation results reveal that while the transient sag/swell and the harmonic distortion on either side of the traditional transformer windings will have a direct influence on the load voltage/currents on the other side of the transformer windings, these effects can be mitigated with SST and the controller of SST can actively regulate the reactive power to provide the desired reactive power support.
Open Access Status
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