A Novel Space Vector PWM of Z-Source Inverter with Minimum Inductor Current Ripple
Keywords:Current Ripple, Modified Space Vector PWM, Shoot Through, Z-Source Inverter (ZSI)
The Z-Source Inverter (ZSI) overcomes the disadvantages of the traditional Voltage-Source Inverter (VSI) and Current-Source Inverter (CSI).It can buck and boost its output voltage by utilizing the shoot-through state which is forbidden in traditional VSI. Different Pulse Width Modulation (PWM) techniques are available for the control of Z-Source Inverters. In the traditional PWM technique equal shoot-through time interval is considered for the three phase legs. Hence, the realization of the shoot-through state is easy, but the main drawback of this modulation method is big inductor ripple and a large inductor when the output frequency is low. In this paper, a novel Space Vector Pulse Width Modulation (SVPWM) technique to reduce the inductor current ripple is proposed, which will minimize the cost and size of the circuit while providing a higher output voltage boost. The principle of the traditional and proposed SVPWM strategy is analyzed, and the comparison of current ripple under the traditional and proposed strategy is given. Simulation and experimental results are shown to verify the analysis.
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