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2. Solid-State Transformers For Distribution Systems-Part I: Technology And Construction

Author

Saleh, Saleh A. M., Richard, Chistian, St Onge, Xavier Francis, McDonald, Katie M., Ozkop, Emre, Chang, Liuchen, and Alsayid, Basim

Abstract

Solid-state transformers (SSTs) are an emerging technology that has been developed to improve the stability, reliability, and economic operation of distribution systems. These new transformers are composed of a medium ac voltage (MV) stage, a dc stage, and a low ac voltage (LV) stage. Passive and active dc links are used to construct the dc stage in SSTs in order to offer new functionalities, including hybrid (ac and dc) distribution, reactive power compensation, voltage/frequency regulation, power quality improvement, and distributed generation utilization. On one hand, a distribution SST has its ac stage connected to an MV level, which mandates specific power electronic converter (PEC) topologies, switching element capabilities, and filtering circuits. On the other hand, the dc-link stage has to provide isolation between the MV and LV levels, which requires the employment of isolated dc PECs. Part I of this work provides a review of SST designs and constructions (for deployment in distribution systems), in terms of the required technology, supported functionalities, and construction features.

Published
2019

8. Testing the Performance of a dq0 Phaselet Transform Based Digital Differential Protection for 3φ Converter Transformers.

Author

Saleh, Saleh A. M., Ozkop, Emre, St-Onge, Xavier Francis, and Richard, Chistian

Subjects
FAULT location (Engineering), SIGNAL processing, POWER transformers, CURRENT transformers (Instrument transformer), PERFORMANCES
Abstract

This article presents and tests the performance of a digital differential protection for three-phase (3φ) converter transformers. The proposed digital differential protection is developed to comply with the ANSI 87T protection procedure. The presented protection is featured with fault detection based on the energy contents of the high-frequency subbands of the d−q axis components of differential currents. Desired energy contents are extracted using the phaselet transform (PHT), which can process signals without sensitivity to the variations in their phase shifts. Energy contents of the high-frequency subbands offer accurate, fast, and reliable detection, and identification of internal faults in any part of a 3φ converter transformer. The d−q PHT-based digital differential protection is implemented for performance evaluation using different 3φ converter transformers, when feeding controlled rectifier units. Performance results demonstrate accurate, fast, and reliable detection, and response to different types of fault, and nonfault events. Response features of the developed differential protection are complimented with simple implementation, reduced computations, and minor sensitivity to phase shifts, fault location, and loading levels. [ABSTRACT FROM AUTHOR]

Published
2020
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