Performance Analysis of Z - Source PWM Inverter with Linear and Non-Linear Load

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Z Source PWM Inverter, Linear and Non Linear Load
Sagar Singh Baghel; A. K. Yadav
This work verified the alternative power conversion topology of PWM Inverter which has several limitations like Output AC voltage never be greater than applied DC voltage, buck and boost phenomenon cannot be happen with a single circuit, size of inverter will be increases as demand of voltage will be increases, efficient operation etc. have a several problems. The objective of this project is to develop and demonstrate a high voltage, low cost, efficient, and reliable inverter for traction drives of fuel cell vehicles. Because of the wide voltage range of the fuel cell, the inverter and motor need to be oversized to accommodate the great constant power speed ratio. The Z-Source inverter could be a cheap and reliable solution for this application. Currently, two types of inverters are used in fuel cell vehicle and hybrid electric vehicle traction drives: the traditional pulse width modulation (PWM) inverter and the dc to dc boost PWM inverter. For FCVs, the fuel cell voltage to the inverter decreases with an increase in power drawn from the fuel cell. Therefore, the obtainable output voltage of the traditional PWM inverter is low at high power for this application, so an oversized inverter and motor must be used to meet the requirement of high-speed, high power operation. The dc to dc boost PWM inverter does not have this problem; however, the extra dc to dc stage increases the complexity of the circuit and the cost and reduces the system efficiency. The detail design process for Impedance source PWM inverter for linear and non-linear load are provided. The design includes the Impedance source network, device selection, PWM module design, shoot-through process, and inverter firing process. Several PWM schemes with shoot-through are proposed and compared. The PWM scheme with maximum constant boost, different from other PWM scheme proposed, results in less switching loss.

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