Minimum Switching Losses Discontinuous PWM Strategy for Bidirectional Single-Phase AC-DC Converter with Active Power Decoupling Circuit

Junzhong Xu, Thiago Batista Soeiro, Fei Gao, Houjun Tang, Pavol Bauer

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Active power decoupling circuits are used in bidirectional single-phase grid-connected systems to enhance the circuit lifetime by creating an alternative path for the typical DC-side power pulsating ripple. Therefore, this reduces the requirement of smoothing DC capacitors allowing compact designs even with the implementation of long-life metalized film technology. However, with the necessary addition of auxiliary components, extra power losses in the added switching devices and passive components will be introduced, which will inevitably reduce the system power conversion efficiency. To relieve this issue, a new discontinuous pulse width modulation (PWM) strategy with minimum switching losses is proposed in this paper. This method detects the converter current and reference voltages synchronously to determine the optimum clamped duration of each circuit phase-leg. With such a characteristic, the proposed strategy can realize the minimum switching losses at any instant, thus improving the power conversion efficiency and potentially the power density of the converter. The proposed modulation method is described, analyzed, validated, and compared with different PWM methods on a 2 kVA bidirectional single-phase AC-DC converter with active power decoupling circuit.

Original languageEnglish
JournalIEEE Transactions on Power Electronics
DOIs
Publication statusAccepted/In press - 2021

Keywords

  • AC-DC converter
  • active power decoupling
  • Capacitors
  • discontinuous pulse width modulation (DPWM)
  • Modulation
  • Reactive power
  • Single-phase
  • Space vector pulse width modulation
  • Switching loss
  • switching losses
  • Topology
  • Voltage control

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