TY - JOUR
T1 - Minimum Switching Losses Discontinuous PWM Strategy for Bidirectional Single-Phase AC-DC Converter with Active Power Decoupling Circuit
AU - Xu, Junzhong
AU - Soeiro, Thiago Batista
AU - Gao, Fei
AU - Tang, Houjun
AU - Bauer, Pavol
PY - 2021
Y1 - 2021
N2 - 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.
AB - 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.
KW - AC-DC converter
KW - active power decoupling
KW - Capacitors
KW - discontinuous pulse width modulation (DPWM)
KW - Modulation
KW - Reactive power
KW - Single-phase
KW - Space vector pulse width modulation
KW - Switching loss
KW - switching losses
KW - Topology
KW - Voltage control
UR - http://www.scopus.com/inward/record.url?scp=85097186217&partnerID=8YFLogxK
U2 - 10.1109/TPEL.2020.3040013
DO - 10.1109/TPEL.2020.3040013
M3 - Article
AN - SCOPUS:85097186217
JO - IEEE Transactions on Power Electronics
JF - IEEE Transactions on Power Electronics
SN - 0885-8993
ER -