A novel single-phase voltage sag restorer with diode-clamped multilevel bridge

A novel single-phase voltage sag restorer with diode-clamped multilevel bridge is presented. In the proposed circuit, traditional two-level half bridge inverter is replaced by multilevel diode-clamped inverter, in which the DC-bus voltage is split into several levels by series-connected bulk capacit...

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Bibliographische Detailangaben
Hauptverfasser:	Ding, K., Cheng, K.W.E., Xue, X.D., Divakar, B.P., Wang, S.X., Xu, C.D., Wang, D.H.
Format:	Tagungsbericht
Sprache:	eng
Schlagworte:	Bridge circuits Circuit simulation Diode-Clamped Diodes Multilevel Power electronics Power interruption Power quality Power system Power system reliability Power system restoration Pulse width modulation inverters Switches Voltage fluctuations Voltage sag
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Beschreibung
Zusammenfassung:	A novel single-phase voltage sag restorer with diode-clamped multilevel bridge is presented. In the proposed circuit, traditional two-level half bridge inverter is replaced by multilevel diode-clamped inverter, in which the DC-bus voltage is split into several levels by series-connected bulk capacitors. Although the multilevel circuit has more component count than the two-level circuit it is more suitable for high voltage applications. The restorer is bypassed under normal operating conditions and is connected to the load depending upon voltage sag detection. The switches of the inverter are controlled by PWM signals. In the paper the operation of the multilevel circuit is simulated in SABER to study the operating capability of the multilevel inverter. A comparative study between the traditional two-level circuit and the proposed multilevel circuit is provided to highlight the performance of the multilevel circuit.