Grid‐tied photovoltaic system with series Z‐source inverter

Tang, Yuting; Wei, Jukui; Xie, Shaojun

doi:10.1049/iet-rpg.2012.0335

Cited by 49 publications

(32 citation statements)

References 27 publications

(40 reference statements)

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“…With this in For utilizing the full benefit of PV units under different operating conditions, different types of ZSI topologies have been developed for PV applications where the main focus is to improve efficiency. Three new topologies for ZSIs are proposed in [11][12][13], which are named improved ZSI, embedded ZSI, and series ZSI. All these topologies overcome the limitations of the traditional ZSI by lowering the voltage stress and suppressing the inrush current.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of a Modernized Z-Source Inverter for Robust Boost Control in Photovoltaic Power Conditioning Systems

et al. 2019

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In this paper, the performance of a new Z-source inverter (ZSI)-based single-stage power conditioning system (PCS) is analyzed for a standalone photovoltaic (PV) power generation system. The proposed ZSI-based PCS includes two main parts: one is the input from PV units and the other is the ZSI. In this work, a new topology, termed the switched inductor-assisted strong boost ZSI (SL-SBZSI), is introduced for improving the performance of the PCS. The proposed topology shows high boosting capability during the voltage sag in PV units due to variations in solar irradiation and temperature. Another key advantage is the reduced capacitor voltage stress and semiconductor switch voltage stress of the inverter bridge, which ultimately minimizes the size and cost of the single-stage PCS. The proposed ZSI topology falls under the doubly grounded category of inverter by sharing the common ground between the input and output. This is an additional feature that can minimize the leakage current of PV units at the ac output end. The operational principles, detailed mathematical modeling, and characteristics of the proposed SL-SBZSI for a standalone photovoltaic (PV) power generation system is presented in this paper for analyzing performance. The simulation results, which are performed in MATLAB/Simulink, demonstrate the improved performance of the proposed SL-SBZSI for the standalone PV system. The performance of the proposed topology is also evaluated through an experimental validation on a laboratory-based PV system. the world was around 90 GW in 2012 and the target amount is estimated as approximately 350 GW by the end of 2020. Evidently, PV energy is one of the most promising sources for mitigating future load demands.Generally, PV energy is received from sun, and its extraction involves a large installation cost. The basic cost of this system relies on the photovoltaic panels and the interfacing power electronic converter that couples the source with the load. This part is commonly known as the power conditioning system (PCS). Figure 1 represents the traditional boost converter-based dual-stage and the Z-source inverter (ZSI)-based single-stage PCS. The main function of the PCS is to convert the output DC voltage of the PV unit into 50/60 Hz AC voltage suitable for households and grid applications. Traditionally, a voltage source inverter (VSI) with a DC-DC boost converter comprising the dual-stage PCS is used to convert the DC output power into AC power [7]. This additional DC-DC boost converter increases the size and cost of the PV power generation system. A ZSI for PV systems as presented in [8] obsoletes the additional boost converter with its distinct impedance network. Due to its shoot-through characteristics, the ZSI-based PCS can boost the input voltage of the PV system during voltage fluctuations due to changes in solar irradiation and environmental temperature. Although the ZSI turns the dual-stage traditional system into a single-stage system, it inherits some certain drawbacks regarding its performance, such as...

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Section: Introductionmentioning

confidence: 99%

Performance Analysis of a Modernized Z-Source Inverter for Robust Boost Control in Photovoltaic Power Conditioning Systems

et al. 2019

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“…The lower modulation index is considered as another limitation of the existing ZSI as this affects voltage gain and produces distorted output voltage waveforms [13]. These problems are avoided in several works of literature where new topologies such as an improved ZSI [12], embedded ZSI [14], qZSI [15], and series ZSI [16] are developed by introducing distinct impedance configurations. Most of these topologies are used to minimize the voltage stress on capacitors and switches along with the input inrush current reduction of the traditional ZSI.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Steady-State Characteristics for a Newly Designed High Voltage Gain Switched Inductor Z-Source Inverter

et al. 2019

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This paper aims to develop a new switched inductor assisted strong boost Z-source inverter (SL-SBZSI) topology with high voltage gain and analyze the steady-state characteristics of the proposed topology. In the proposed topology, two switched inductors are used within the series impedance structure of the Z-source inverter (ZSI) in order to achieve the high voltage gain. The steady-state characteristics of the proposed topology are analyzed to disseminate its several advantages as compared to traditional ZSIs. The key advantages include the higher boost factor with lower shoot-through duty ratio and lower voltage stresses on capacitors as well as on switches of the inverter bridge. Furthermore, the proposed topology has the soft-start ability which significantly reduces the inrush start-up current while comparing with the traditional ZSI. In the proposed topology, a common ground is shared between the output AC voltage and the input DC voltage source which categorizes this topology to the doubly grounded inverter. The characteristics of the proposed SL-SBZSI are analyzed by considering two operating condition where the simple boost pulse width modulation (PWM) scheme is used to extract the shoot-through pulses. The characteristics of the proposed topology are also compared with different existing topologies along with the conventional modified capacitor assisted Z-source inverter (MCA-ZSI), whose boost factor is much closer to the proposed topology. Rigorous mathematical analyses are presented to clearly demonstrate the benefits of the proposed topology while simulation studies are carried out to demonstrate its distinct features as compared to the existing topology. Finally, experimental studies are conducted to further validate the theoretical and simulation results.

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“…In this topology, controlling of shoot-through state enables to control the boost feature with improved reliability. Further, various Z-source converter-based topologies are proposed in literature such as quasi Z-source inverter [17], series Z-source inverter [18], and trans Z-source inverter [19]. The literature related to Z-sourcebased topologies reveals that major focus is on DC-AC mode of operation and shoot-through control techniques.…”

Section: Introductionmentioning

confidence: 99%

A step‐up PWM DC–DC converter for renewable energy applications

Patidar

Umarikar

2015

Circuit Theory & Apps

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SUMMARYA step-up pulse width modulation (PWM) direct current (DC)-DC converter is presented in this paper, which has its origin in quasi Z-source inverter. Analysis of this converter in steady state is presented, and relevant expressions are derived for the proposed converter operating in continuous conduction mode. The power loss expressions for each component of the converter are derived, and thereby, obtained expressions for overall converter efficiency are presented. Further, a dynamic model is derived to design an appropriate controller for this converter. The simulation and experimental results are presented to support the theoretical analysis. The advantages such as continuous input current, high step-up gain at lower duty ratio, and common ground for source, load, and switch makes the converter suitable for renewable energy applications.

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Grid‐tied photovoltaic system with series Z‐source inverter

Cited by 49 publications

References 27 publications

Performance Analysis of a Modernized Z-Source Inverter for Robust Boost Control in Photovoltaic Power Conditioning Systems

Performance Analysis of a Modernized Z-Source Inverter for Robust Boost Control in Photovoltaic Power Conditioning Systems

Analysis of Steady-State Characteristics for a Newly Designed High Voltage Gain Switched Inductor Z-Source Inverter

A step‐up PWM DC–DC converter for renewable energy applications

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