Z-Source Inverter: Topology Improvements Review

Abstract:In this study, a new circuit topology using a Z-source resonant inverter (ZSRI) for high power applications in large-air-gap contactless power transfer (CPT) systems, has been investigated. The main shortcoming of a large-air-gap CPT system is the poor power transfer efficiency due to low magnetic coupling. In order to minimize this shortcoming and to improve the overall performance of the system by boosting the power transfer capability, in this paper a CPT system with the newly developed circuit topology using high frequency Z-source resonant inverter has been proposed. Using the newly developed circuit topology for the CPT system, it has been observed that the overall performance of the system has been improved to a reasonable level with a purely sinusoidal resonant current flowing through the primary side. Therefore, no harmonics will be injected into the source. The proposed CPT system with an air gap of 16 cm and a misalignment of 3 cm has been simulated using the Maxwell finite element tool and Simplorer circuit simulation software for an output power of 2 kW.

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“…TSW = TA + TS + T0. Now, the capacitor voltage of the Z-source network [17,18,25] can be expressed as:…”

Section: Operation During Shoot-through State or Boost Modementioning

confidence: 99%

A new circuit topology using Z-source resonant inverter for high power contactless power transfer applications

Ghosh

Sadhu

Ghosh

et al. 2017

Archives of Electrical Engineering

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“…In order to overcome the aforementioned disadvantages, the impedance source inverter (ZSI) has been proposed [5], [6]. The single-stage ZSI topology has an impedance network that consists of two inductors and two capacitors connected in Z shape.…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Single-Phase Grid-Tied PV Systems with Single and Double Power Conversion Stages

Sampaio¹,

Silva²,

Miranda³

2024

RE&PQJ

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Abstract. This paper presents a comparative analysis of two single-phase grid-tied photovoltaic (PV) systems. The first is deployed employing a single-stage power conversion, while the second a double-stage power conversion is used. In the singlestage PV system topology the impedance source inverter (ZSI) is used to perform the maximum power point tracking (MPPT), as well as the control of the active current injected into the grid. On the other hand, in the double-stage PV system a dc-dc boost converter (BC) performs the MPPT, whereas a voltage source inverter (VSI) controls the amount of energy injected into the grid. In both aforementioned PV systems, Perturb and Observe (P&O) based algorithm is employed to perform the MPPT. The comparative analysis takes into account the following aspects: i. converter efficiency; ii MPPT efficiency; iii total harmonic distortion of the grid-tied inverter current; and iv. number of electrical and electronic devices needed to implement the PV systems. Furthermore, the ZSI and BC+VSI modelling and the procedures used to design the controller gains are also presented. Finally, by means of computational simulations, the performance and functionality of the ZSI and BC+VSI PV systems are evaluated.

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“…Also, in ZSI converters, the output waveform presents less distortion, mainly because both power devices in a leg can turn on at the same time. Other authors [3] have proposed alternative topologies based on ZSIs. For example, [4] proposes a bidirectional ZSI (BZSI), in which a bidirectional switch replaces the input diode.…”

Section: Introductionmentioning

confidence: 99%

Quasi-switched inverter using space vector pulse width modulation with triangular comparison for photovoltaic applications

Moran

Restrepo

Orozco-Gutierrez

et al. 2018

TecnoL.

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This work analyzes a prototype of a quasi-switched boost inverter (qSBI) feeding an isolated resistive load from a DC source. The use of spatial vector pulse width modulation (SPWM) with triangular comparison is proposed to increase the qSBI gain factor, and its performance is contrasted with other types of spatial vector modulations, such as discontinuous modulations. To verify the validity of the method for voltage range extension in the qSBI converter, a semi-customized test platform was developed. This platform uses a DSP floating point card (Analog Devices ADSP-21369) for processing and control strategies and an interface card that includes a programmable logic array (FPGA) from Xilinx (Spartan-3), which allows to develop the synchronized modulation qSBI needs. The experimental results show improvements in the performance of the qSBI converter in terms of gain factor, voltage reduction in the capacitor, and input current profiles. Discontinuous space vector modulation strategies do not perform well when compared to continuous SVPWM or SPWM modulations, because the ripple levels in the currents taken from the PV module are approximately twice as great as in continuous modulation techniques. Finally, the usefulness of a qSBI as PV microinverter is confirmed by two practical experimental cases of a PV photovoltaic system with a maximum power point adjustment algorithm (MPPT).

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Z-Source Inverter: Topology Improvements Review

Cited by 264 publications

References 73 publications

A new circuit topology using Z-source resonant inverter for high power contactless power transfer applications

A new circuit topology using Z-source resonant inverter for high power contactless power transfer applications

Comparative Analysis of Single-Phase Grid-Tied PV Systems with Single and Double Power Conversion Stages

Quasi-switched inverter using space vector pulse width modulation with triangular comparison for photovoltaic applications

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