A modified Z-source inverter topology for stable operation of transformerless photovoltaic systems with reduced leakage currents

A new single-phase transformerless current source inverter is proposed in this paper. The proposed inverter can achieve leakage current reduction, which is crucial for the conventional current source inverter. The basic concept of the proposed solution is to develop the new inverter by the duality principle from the voltage source inverter. The theoretical analysis is carried out to determine the switching states of the proposed inverter for the leakage current reduction. Also, a new modulation strategy is presented to achieve the optimized switching states. Finally, the experimental results are presented. Comparing with conventional single-phase current source inverter, the leakage current can be significantly reduced by the proposed inverter, which verifies the effectiveness of the proposed solution.

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“…In the negative half cycle, the range of vector angle θ is from π to 2π. I ref can be represented as Equation (16).…”

Section: Simulation and Experimental Resultsmentioning

confidence: 99%

“…It applies the specified switching states with less CMV. Bradaschia et al [15,16] proposed effective methods to reduce leakage current which only need additional fast-recovery diodes. To increase the optional switching states, the extra switch can also be added to the system.…”

Section: Introductionmentioning

confidence: 99%

A New Single-Phase Transformerless Current Source Inverter for Leakage Current Reduction

et al. 2018

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“…As can be readily seen from (11), by applying the appropriate changes to the shoot‐through duty cycle, d , through a simple boost PWM shown in Fig. 1 b , the capacitor voltage can be regulated according to the connected load [39].…”

Section: Circuit Analysismentioning

confidence: 99%

LMI‐based robust controller design and implementation for Z‐source inverters

Ahmadi

Mohammadi

Mohammadi‐Ivatloo

et al. 2020

IET power electron.

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In this study, robust control of impedance source inverters in the presence of uncertainties such as parameters perturbation, unmodelled dynamics and load disturbances, is addressed. These uncertainties, which are naturally available in any power system, have a profound impact on the performance of power inverters and may lead to performance degradation or even instability of the system. A novel LMI‐based design procedure is presented to guarantee the stability of the inverter subject to uncertainties in a Lyapunov‐based framework while a certain level of disturbance rejection is satisfied. Simulation results demonstrate the superior performance of the presented method against comparative controllers. Finally, the proposed controller is applied to an experimental system and the results are compared with simulations, where both substantiate the potency of the proposed controller.

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“…Many improvements are made in the basic topology of ZSI to arrive at numerous topologies like switched inductor/capacitor, tapped inductor, magnetically coupled ZSI and transformer isolated type which are developed mainly to enhance the output voltage boosting and inversion ability along with reducing component stresses [31], [41], [65][66][67][68][69][70][71][72][73][74][75][76][77][78][79][80][81]. Other than three phase ZSI, single phase ZSI have been developed over these years with dual grounding, reduced switch and various control techniques [57][58][59][60][61][62][63][64].…”

Section: Z Source Inverter/convertertopologiesmentioning

confidence: 99%

Z Source Inverter Topologies-A Survey

Saravanan¹,

Aravindan²,

Balaji³

et al. 2017

Bulletin EEI

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Need for alternative energy sources to satisfy the rising demand in energy consumption elicited the research in the area of power converters/inverters. An increasing interest of using Z source inverter/converter in power generation involving renewable energy sources like wind and solar energy for both off grid and grid tied schemes were originated from 2003. This paper surveys the literature of Z source inverters/converter topologies that were developed over the years.

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A modified Z-source inverter topology for stable operation of transformerless photovoltaic systems with reduced leakage currents

Cited by 13 publications

References 12 publications

A New Single-Phase Transformerless Current Source Inverter for Leakage Current Reduction

A New Single-Phase Transformerless Current Source Inverter for Leakage Current Reduction

LMI‐based robust controller design and implementation for Z‐source inverters

Z Source Inverter Topologies-A Survey

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