A Zero-Voltage-Switching (ZVS) sinusoidal pulse width modulation (SPWM) method for three-phase four-wire inverter is proposed in order to achieve higher efficiency and power density. With the proposed modulation scheme, the ZVS operation of all switches including the main switches and the auxiliary switch can be realized. Besides, all seven switches operate at a fixed frequency. The ZVS SPWM scheme is introduced by considering the various combinations of the polarities in three-phase filter inductors currents and analysis of operating stages is presented. ZVS condition of the ZVS SPWM scheme is derived and discussions of ZVS condition for typical three-phase loads are also provided. In addition, the resonant parameters design and loss analysis are briefly investigated. Finally the proposed ZVS SPWM scheme is verified on a 10 kW inverter prototype with SiC MOSFET devices.

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Zero-Voltage-Switching Sinusoidal Pulse Width Modulation
Method for Three-phase Four-wire Inverter
ABSTRACT:
A Zero-Voltage-Switching (ZVS) sinusoidal pulse width modulation (SPWM) method for three-
phase four-wire inverter is proposed in order to achieve higher efficiency and power density.
With the proposed modulation scheme, the ZVS operation of all switches including the main
switches and the auxiliary switch can be realized. Besides, all seven switches operate at a fixed
frequency. The ZVS SPWM scheme is introduced by considering the various combinations of
the polarities in three-phase filter inductors currents and analysis of operating stages is presented.
ZVS condition of the ZVS SPWM scheme is derived and discussions of ZVS condition for
typical three-phase loads are also provided. In addition, the resonant parameters design and loss
analysis are briefly investigated. Finally the proposed ZVS SPWM scheme is verified on a 10
kW inverter prototype with SiC MOSFET devices.
KEYWORDS:
1. Zero-Voltage-Switching (ZVS)
2. Sinusoidal pulse width modulation (SPWM)
3. Three-phase four-wire inverter
SOFTWARE: MATLAB/SIMULINK

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CIRCUIT DIAGRAM:
Fig. 1. ZVS three-phase four-wire inverter.
EXPECTED SIMULATION RESULTS:
(a) (b)

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(c) (d)
Fig. 2. Three-phase load voltages and filter inductors currents of the ZVS inverter under balanced resistive load: (a)
Three-phase load voltage, (b) load voltage and filter inductor current of phase A, (c) load voltage and filter inductor
current of phase B, and (d) load voltage and filter inductor current of phase C.
(a) (b)

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(c) (d)
Fig. 3. Three-phase load voltages and filter inductors currents of the ZVS inverter under unbalanced resistive load:
(a) Three-phase load voltage, (b) load voltage and filter inductor current of phase A, (c) load voltage and filter
inductor current of phase B, and (d) load voltage and filter inductor current of phase C.
(a) (b)

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(c) (d)
Fig. 4. Three-phase load voltages and filter inductors currents of the ZVS inverter under unbalanced inductive load:
(a) Three-phase load voltage, (b) load voltage and filter inductor current of phase A, (c) load voltage and filter
inductor current of phase B, and (d) load voltage and filter inductor current of phase C.
CONCLUSION:
A ZVS SPWM method combining with aligned turn on gate signals and extra short circuit stage
is proposed for three-phase four-wire inverter. The generalized ZVS condition of the ZVS
SPWM scheme is derived and the discussions of ZVS condition for some typical three-phase
loads are provided. For balanced resistive load, balanced inductive load and unbalanced resistive
load, short circuit stage is required. The short circuit stage may not be needed during several
intervals for some kinds of unbalanced inductive load. The estimated loss analysis show that
significant efficiency advantages can be obtained by ZVS three-phase four-wire inverter at high
switching frequency in comparison with the hard switching three-phase four-wire inverter.
The ZVS turn-on of all switches, including the main switches and auxiliary switch under
both balanced and unbalanced resistive load are achieved in the complete fundamental period

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with experimental verification. Besides, the ZVS SPWM inverter shows significant efficiency
advantage. The measured highest conversion efficiency of the ZVS SPWM inverter is 98.3 %
and 1.7 % higher than that of the hard switching inverter. At full load, the ZVS SPWM inverter
has 2.1 % higher efficiency than the hard switching inverter.
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