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.
Considering the negative impact of large-scale application of Electric Vehicles (EVs) on power network planning and operation, this paper proposes a coordinated charging strategy for EVs based on valley load tracking, aiming at reducing load fluctuation. By optimizing the charging sequence of EVs, the valley period of the daily load curve tends to be smooth, which plays a better role in filling the valley and reduces the peak-valley difference. Finally, an example is analyzed by Monte Carlo simulation, which proves that the proposed coordinated charging strategy is efficient and practical.
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