Abstract
This paper presents research on the voltage and current distortion in the input stage, isolation stage and output stage of Distribution Electronic Power transformer (D-EPT) after the open-circuit and short-circuit faults of its power switches. In this paper, the operational principles and the control methods for input stage, isolation stage and output stage of D-EPT, which work as a cascaded H-bridge rectifier, DC-DC converter and inverter, respectively, are introduced. Based on conclusions derived from the performance analysis of D-EPT after the faults, this paper comes up with the effects from its topology design and control scheme on the current and voltage distortion. According to the EPT fault characteristics, since the waveforms of relevant components heavily depend on the location of the faulty switch, it is very easy to locate the exact position of the faulty switch. Finally, the fault characteristics peculiar to D-EPT are analyzed, and further discussed with simulation on the Saber platform, as well as a fault location diagnosis algorithm.
Highlights
The electronic power transformer (EPT), usually referred to as power electronic transformer (PET)or solid state transformer (SST), is a new sort of power transformer, which is based on power electronic converters
A significant advantage of EPT is that the magnitude and phase angle of voltages in both the primary side and the secondary side of EPT can be controlled in real-time through power electronic converters to achieve flexible regulation of the current and power
If the open-circuit fault happens on the IGBT with its anti-parallel diode normal, the current could pass through the anti-parallel diode of SR3 from b point to the Input Stage DC Bus (ISDCB), blocked from ISDCB to b point
Summary
The electronic power transformer (EPT), usually referred to as power electronic transformer (PET). Fault detection and protection of those power electronic converters and power switches are of great importance for EPT, whose failure could result in damage to the whole power system and loss to end user. The abnormal state resulting from an open-circuit fault can lead to overstresses on the healthy switches as well as pulsating currents This can in turn lead to failures of other components. The fault characteristics based on the power switches of EPT are proposed for fault detection and EPT protection.
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