An analysis on the main formulas of Z-source inverter (original) (raw)

A New Switching Scheme for Z-source Inverter to Minimize Ripples in the Z-source Elements

This paper presents a modification in pulse width modulation (PWM) scheme with unequal shoot-through distribution for the Z-source inverter (ZSI) which can minimize ripples in the current through the Z-source inductors as well as the voltage across the Z-source capacitors. For the same system parameters, the proposed control technique provides better voltage boost across the Z-source capacitor, DC-link, and also the AC output voltage than the traditional PWM. The ripples in the Z-network elements are found to be reduced by 75 % in the proposed modulation scheme with optimum harmonic profile in the AC output. Since the Z-network requirement will be based on the ripple profile of the elements, the Z-network requirements can be greatly reduced. The effectiveness of the proposed modulation scheme has been simulated in Matlab/Simulink software and the results are validated by the experiment in the laboratory.

From the SelectedWorks of suresh L 2012 MODELING AND SIMULATION OF Z- SOURCE INVERTER

— Z – source inverters have been recently proposed as an alternative power conversion concept as they have both voltage buck and boost capabilities. These inverters use a unique impedance network, coupled between the power source and converter circuit, to provide both voltage buck and boost properties, which cannot be achieved with conventional voltage source and current source inverters. To facilitate understanding of Z – source inverter, this paper presents a detailed analysis, showing design of impedance network, implementation of simple Boost control PWM technique and simulation of Z – source inverter for different values of modulation indices. Index Terms—PWM Technique, SBC, Z – source inverter.

Comparative Study of Z-Source Inverter

2018

A comparative study of few z-source inverter topologieswith control methods are compared and presented in this paper. Z-source inverter uses shoot-through state which boosts input voltage, improves reliability of converter. This is useful in some applications like electrical drives, power generation technologies such as fuel cells, solar photovoltaic cells, wind turbines and commercial application like hybrid electric vehicles, etc. The ZSI has few drawbacks like decrease in efficiency, unidirectional power flow, light-load operation, higher inrush current

From the SelectedWorks of suresh L MODELING AND SIMULATION OF Z- SOURCE INVERTER

Z -source inverters have been recently proposed as an alternative power conversion concept as they have both voltage buck and boost capabilities. These inverters use a unique impedance network, coupled between the power source and converter circuit, to provide both voltage buck and boost properties, which cannot be achieved with conventional voltage source and current source inverters. To facilitate understanding of Z -source inverter, this paper presents a detailed analysis, showing design of impedance network, implementation of simple Boost control PWM technique and simulation of Z -source inverter for different values of modulation indices.

Z-Source Inverter Simulation and Harmonic Study

Abstract-The Z-source inverter is an alternative power conversion topology that can both buck and boost the input voltage using passive components. With its unique structure, Z-source inverter can utilize the shoot through states to boost the output voltage, which improves the inverter reliability greatly, and provides an attractive single stage dc to ac conversion that is able to buck and boost the voltage.

LC-Z-Source Inverter Design and Control

Chinese journals of electronics, 2020

The paper presents a new Z-source inverter with a low-stress reduction in the voltage of capacitors compared to the traditional Z-source inverter with the same boost factor. The proposed structure reduces costs and weight by reducing voltage capacitors. The main difference between this inverter and the traditional Z-source inverter lies in the arrangement of the components. In addition, the superiority of the proposed inverter over the L-Z-source inverter is related to the use of two capacitors instead of two diodes, which increases the boost power factor and obviates the need for the snubber circuit. Furthermore, another advantage of the proposed inverter can be extended to n cases in cascade form and the proposed inverter is continues current. The analysis, derivation of boost factor, capacitor voltages, voltages gain, and switch stress of the proposed inverter topology are carried out and are compared with the similar inverters. The advantages of the proposed structure are verified by simulation and implementation.

Modelling and Simulation of PWM Based Z- Source Inverter Using Matlab/Simulink

2014

Voltage Source and Current Source Inverters have some common problems. The Z-Source Inverter is a novel power conversion topology that can buck and boost the input voltage using passive components. With its unique structure, Z-Source Inverter can utilize the shoot through states to boost the output voltage and provides an attractive single stage DC to AC conversion that is able to buck and boost the voltage. The shoot-through duty cycle is used for controlling the DC link voltage boost and hence the output voltage boost of the inverter. In this paper MATLAB/SIMULINK model of Z-Source Inverter has been developed and harmonics analysis is carried out. Simulation results and harmonics analysis are compared with traditional inverters. It is found that for 0.1 pulse width the Total Harmonics Distortion (THD) and Weighted Total Harmonics Distortion (WTHD) are 0.22% and 0.08% respectively.

Simulation of SPWM based Z-Source Inverter

This paper presents a single stage Z-source inverter (ZSI) that can either buck or boost the ac output voltage from a DC supply. This topology overcomes the short comings of the where the output ac voltage is either less or more than the input dc voltage. The ZSI also allows two switches of the same leg to be gated in the circuit thus eliminating the shoot through fault that normally occurs in the traditional converters. This feature of the inverter provides the elimination of dead time in the circuit, thus increasing the reliability and reducing the output distortion. To prove the effectiveness of ZSI in reducing THD, performance of ZSI is evaluated using MATLAB/SIMULINK model developed for ZSI feeding R, RL, Motor load. The simulation results are presented for various modulation indexes and compared with the simulation results of VSI and CSI. The results validate the effectiveness of ZSI over VSI and ZSI.

Design and simulation of the single phase Z-Source Inverter

International Journal of Advance Research Ideas and Innovations in Technology

Z-source converter overcomes the conceptual and theoretical barriers and limitations of the traditional voltage-source converter (abbreviated as V-source converter) and current-source converter (abbreviated as I-source converter) and provides a novel power conversion concept. The Z-source concept can be applied to all DC-to-AC, AC-to-DC, AC-to-AC, and DC-to-DC power conversion. Z-source inverters have been recently proposed as an alternative power conversion concept as they have both voltage buck and boost capabilities. These inverters use a unique impedance network, coupled between the power source and converter circuit, to provide both voltage buck and boost properties, which cannot be achieved with conventional voltage source and current source inverters. To facilitate understanding of Z-source inverter, this paper presents a detailed analysis, showing the design of impedance network, implementation of simple Boost control PWM technique and simulation of Z-source inverter for different values of modulation indices.

New Pulsewidth Modulation Strategy of Z-Source Inverter for Minimum Inductor Current Ripple

2015

The SVPWM strategy based on single phase shoot through in Z-source inverter has many advantages, such as higher equivalent operating frequency, smaller ripple of Z-source inductor current and smaller volume and weight of Z-source network. The optimal design of the inductor in Z-source inverter based on this modulation strategy is carried out in this paper. Firstly, the SVPWM strategy of Z-source inverter is achieved by modifying the traditional SVPWM strategy of Voltage-source inverter. Then the waveform and ripple expression of Z-source inductor current can be got quantitatively. The Zsource inductor is designed . At last, by experiments, it is verified that the ripple of the designed inductor current satisfies all the constraints.