The advantages, limitations and disadvantages of Z-source inverter
ABSTRACT A Z-source converter is an unique x-shaped impedance network called Z-source impedance network that couples the converter main circuit to the power source. The converter may be of all conversion types - if it is of ac-to-dc type, the z-source converter is called z-source inverter. Since 2003 when this recently conversion concept appeared, it proved able to solve many conversion problems. In this paper it's superiority compared to traditional solutions are shown. There are also small disadvantages and limitations revealed.
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ABSTRACT: Compared with the traditional inverters, Z-source/Quasi-Z-source inverters have better electrical characteristics. The inverter can cover the shortage of traditional inverter. The impedance network makes the inverter can boost or buck input voltage in any ratio. And the shoot-through question in traditional inverter is not in considered here. This kind of inverter is very suitable to be used in photovoltaic power generation system with wide range input. In this paper, the new proposed high frequency isolated quasi-Z-source inverter is been studied in-depth. The paper gives its small signal modeling method and application in grid-connected PV system. The control strategy used here is making the peak of dc bus voltage constant, which ensures the unity of MPPT stage and inverter stage. At last the paper gives the results of simulation with saber.IECON 2012 - 38th Annual Conference on IEEE Industrial Electronics Society; 01/2012
Conference Paper: High frequency transformer isolated cascaded Quasi-Z-source inverter[Show abstract] [Hide abstract]
ABSTRACT: There are many researches on Z-source/Quasi-Z-source inverters since the topology was proposed in 2002 by Professor F.Z. Peng. This inverter can cover the shortage of traditional inverters. Almost all of the researches are studied in a circuit structure of single-stage. The original Z-source/Quasi-Z-source cannot achieve electrical isolation between input and output. The high frequency transformer isolated Z-source/Quasi-Z-source inverter proposed by F.Z. Peng in 2011 completes and perfects the circuit topologic family of Z-source inverter. It integrates the Z-source impedance network into the two-stage DC-DC-AC inverter by high frequency transformer. This paper makes an in-depth study of high frequency transformer isolated cascaded quasi-Z-source inverter. First the paper analyzes its basic principle and an abnormal working state discontinuous conduction mode (DCM). Based on the formulas, the paper gives some advice of how to choose desirable component parameters and working parameters. At last the paper gives a simulation of the inverter working in photovoltaic power generation system.Industrial Electronics and Applications (ICIEA), 2012 7th IEEE Conference on; 01/2012
Conference Paper: Z-sourced unified power flow controller[Show abstract] [Hide abstract]
ABSTRACT: This paper presents a brief review of Z-source converter. This converter employs a unique impedance network to couple the converter main circuit to the power source thereby overcoming the limitations of the traditional converters and provides a novel power conversion concept. This new converter topology is examined with Unified Power Flow Controller(UPFC) and a simulation study was carried out in MATLAB-Simulink. The results of simulation indicate that Z-source converter(ZSC) can be a good alternative to Voltage Source Converters(VSC). Further investigations are being carried out to assess its suitability and its superiority for UPFC applications.Power Electronics, Machines and Drives (PEMD 2012), 6th IET International Conference on; 01/2012