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Journal ArticleDOI

A Single-Stage Grid-Connected High Gain Buck–Boost Inverter With Maximum Power Point Tracking

TL;DR: In this article, a grid-connected single-stage converter system for photovoltaic (PV) applications is presented, which transfers power from PV to grid while tracking maximum power point (MPP) continuously.
Abstract: Converter system that does both dc–dc conversion and dc–ac conversion in a single stage is called a single-stage converter system (SSCS). Compared to a two-stage converter, SSCS is more efficient and compact in size. In this paper, a grid-connected SSCS (GCSS) system for photovoltaic (PV) applications is presented. This GCSS transfers power from PV to grid while tracking maximum power point (MPP) continuously. The proposed system has several desirable features such as low switching loss, high gain, and compact size that makes this GCSS suitable for PV systems, where the PV system output voltage is low and varies with time. Design of the presented GCSS components with necessary equations and derivation of both current control loop and voltage control loop required for operation are given. Proposed GCSS is simulated using MATLAB/SIMULINK. Detailed simulation and experimental results are given to verify the efficacy of the proposed GCSS.
Citations
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Journal ArticleDOI
TL;DR: This article presents a single-stage hybrid photovoltaic (PV)-fuel cell (FC)-based grid-integrated system with Lyapunov function-based controller design to obtain optimal power extraction from hybrid renewable sources without maximum power point tracking (MPPT) application.
Abstract: This article presents a single-stage hybrid photovoltaic (PV)-fuel cell (FC)-based grid-integrated system with Lyapunov function-based controller design to obtain optimal power extraction from hybrid renewable sources without maximum power point tracking (MPPT) application. The proposed Lyapunov controller performs MPPT function, improves power quality, and forces inverter to inject sinusoidal current to the utility grid. In this proposed approach, the higher switching frequency has been reduced by employing LCL filter inclusion compared to the two-stage hybrid power system. This proposed single-stage system has low cost and improved power quality at the point of common coupling and employed controller injects stable power to the utility grid. In this article, a hybrid overall distributed-particle swarm optimization-based MPPT is employed with FCs and integrated CUK converter. The effectiveness of the employed Lyapunov function-based controller has been tested with dSPACE (DS1104) real-time platform for single-stage hybrid grid-connected power system under varying operating conditions that have high efficiency, reduced harmonic distortion in grid current with the simpler employed power converter. Experimental responses confirm the effectiveness of the proposed controller, which transfers the hybrid power from PV and FC to the utility grid through a single stage.

51 citations


Cites background from "A Single-Stage Grid-Connected High ..."

  • ...In [9] and [10], single-stage grid PV power system has been implemented which provides active/reactive power control with unity power factor and operates PV system at maximum power point (MPP) region under changing operating conditions....

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Journal ArticleDOI
TL;DR: In this paper, a single switched impedance network (SSIN)-based converter with n -stage is proposed and the operation of the SSIN based converter in continuous and discontinuous conduction modes are discussed.
Abstract: The dc-dc converters with high step-up DC-voltage gain play a vital role in integrating low voltage DC sources. Though several converter topologies are reported in the recent past, attempts have been made to reduce the components, especially the switching devices, passive elements, converter losses, etc., of the converter. A novel DC-DC converter topology, viz., single switched impedance network (SSIN)-based converter with n -stage is proposed in this paper. The operation of the SSIN based converter in continuous and discontinuous conduction modes are discussed. The effect of parasitic elements on DC-voltage gain and efficiency of the SSIN is carried out. The small-signal model of the SSIN converter is derived. The performance of the SSIN converter is compared with the similar converter topologies. The 500 W prototypes of the SSIN with n = 1 and n = 2 are fabricated, and the experimental results are presented in this paper. To improve the converter performance, SiC-based semiconductor devices are used. The SSIN converter with two-stage has low switch loss at 500 W load, improved efficiency during high power and high output voltage operation, the switch stress of Vo /2, etc.

48 citations

Journal ArticleDOI
TL;DR: A novel single-phase, transformer-less microinverter configuration derived from the basic Cuk topology, which has several appealing features such as high reliability due to the absence of shoot-through problems, symmetrical operation, low grid current distortion, capability of processing reactive power, low voltage ride through capability, and simple control for tracking the output current reference.
Abstract: In this paper, a novel single-phase, transformer-less microinverter configuration derived from the basic $ \ddot{\text C}$ uk topology is proposed for photovoltaic (PV)-grid interface applications. The topology has a direct connection between the grid neutral and the negative terminal of the PV array, which completely eliminates the ground leakage current. Further, the proposed topology has several appealing features such as high reliability due to the absence of shoot-through problems, symmetrical operation, low grid current distortion, capability of processing reactive power, low voltage ride through capability, and simple control for tracking the output current reference. Small-signal analysis has been employed to derive the topology's dynamic model using which a proportional resonant (PR) controller is designed and implemented. A step by step design procedure for obtaining the optimized proportional and integral gains of the PR controller, considering the effects of pulsewidth modulation transport and digital sampling delays, is presented. Theoretical claims and simulation results are corroborated by experimental studies carried out on a 200 W laboratory prototype controlled by using DSP TMS320F28335 controller.

43 citations


Cites background or methods from "A Single-Stage Grid-Connected High ..."

  • ...For the rated power P and ω, Cin is obtained [15] as...

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  • ...A recent B–B inverter topology that uses coupled inductor for high gain is given in [15]....

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  • ...Assuming a cutoff angular frequency ωcut, which is much less than the switching frequency, and from the value of L2, the value of C2 is obtained from the expression of ωcut [15]....

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Journal ArticleDOI
TL;DR: The proposed topology features less number of components, high gain, self-charging capability of capacitors, reduced size of filter components, and a comprehensive comparative study of the proposed converter topology with the topologies in the literature is given.
Abstract: In this paper, a multisource switched capacitor based boost multilevel inverter is proposed. The proposed topology features less number of components, high gain, self-charging capability of capacitors, reduced size of filter components. The modes of operation of the proposed converter and design guidelines of converter components are discussed. A comprehensive comparative study of the proposed converter topology with the topologies in the literature is given. Analytical expression for capacitor energy utilization (CEU) factor for the proposed topology is derived and the feasibility of the proposed converter with respect to CEU for the designed power rating is verified. The analytical performance of the proposed converter topology is verified through simulation studies. The common mode voltage and leakage current in the proposed topology are analyzed. Experimental prototype of the proposed converter topology with two sources and two capacitors for power rating of 500 W is developed and tested with resistive, inductive, and nonlinear loads. The experimental and simulated results are in close agreement with the analytical steady-state performance of the proposed converter.

36 citations


Cites background from "A Single-Stage Grid-Connected High ..."

  • ...Variants of single-stage high-gain boost converter topologies are proposed in [4] and [6]–[10]....

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  • ...Switched/coupled inductor based converters [4], [6] use either coupled inductor or switching the inductors in different combination for increased conversion gain....

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  • ...The cost and complexity of the system can be reduced by employing single-stage topology [3], [4]....

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Journal ArticleDOI
TL;DR: A family of single-phase single-stage high-gain dual-buck split-source inverters (SSIs) is proposed that provide high reliability by eliminating shoot-through issues, increase switching frequency and efficiency by using power MOSFETs without leading the body diodes to reverse recovery issues, and decrease pulsewidth modulation (PWM) dead-time.
Abstract: In this paper, a family of single-phase single-stage high-gain dual-buck split-source inverters (SSIs) is proposed. The proposed inverters have the combine benefits of SSI, dual-buck inverter (DBI), and high-gain dc–dc converters. Similar to the DBI, they provide high reliability by eliminating shoot-through issues, increase switching frequency and efficiency by using power MOSFETs without leading the body diodes to reverse recovery issues, and decrease pulsewidth modulation (PWM) dead-time. In addition, voltage boost operation is achieved in a single stage without using any additional active switch, which is in favor of lower control complexity and lower cost. On the other hand similar to the SSI, buck–boost dc–ac power conversion is realized in a single stage. However, compared to the SSI, the proposed inverters have no shoot-through issues, MOSFETs can be used without reverse recovery issues, dead-time can be minimized, switching frequencies can be increased, and external fast recovery diodes can be used to improve efficiency. In addition, four different high-gain dual-buck SSIs are presented. As an example, the proposed switched-coupled-inductor split-source DBI is analyzed and compared with the other proposed structures. To validate the theoretical analysis, a 300-W experimental prototype is designed and tested at 25–35-V input voltage, $155~V_{\text {peak}}$ output voltages and 50 kHz.

27 citations


Cites background from "A Single-Stage Grid-Connected High ..."

  • ...In [10], single-stage highgain buck–boost inverter is proposed....

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References
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Journal ArticleDOI
TL;DR: In this article, the authors proposed a new voltage source inverter (VSI) referred to as a boost inverter or boost DC-AC converter, which is intended to be used in uninterruptible power supply and AC driver systems design whenever an AC voltage larger than the DC link voltage is needed.
Abstract: This paper proposes a new voltage source inverter (VSI) referred to as a boost inverter or boost DC-AC converter. The main attribute of the new inverter topology is the fact that it generates an AC output voltage larger than the DC input one, depending on the instantaneous duty cycle. This property is not found in the classical VSI, which produces an AC output instantaneous voltage always lower than the DC input one. For the purpose of optimizing the boost inverter dynamics, while ensuring correct operation in any working condition, a sliding mode controller is proposed. The main advantage of the sliding mode control over the classical control schemes is its robustness for plant parameter variations, which leads to invariant dynamics and steady-state response in the ideal case. Operation, analysis, control strategy, and experimental results are included in this paper. The new inverter is intended to be used in uninterruptible power supply (UPS) and AC driver systems design whenever an AC voltage larger than the DC link voltage is needed, with no need of a second power conversion stage.

685 citations


"A Single-Stage Grid-Connected High ..." refers background in this paper

  • ...A single stage boost dc-ac topology is proposed in [5], as shown in Fig....

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Journal ArticleDOI
TL;DR: In this article, the authors proposed a high performance single-stage inverter topology for grid connected PV systems, which can not only boost the usually low photovoltaic (PV) array voltage, but can also convert the solar dc power into high quality ac power for feeding into the grid, while tracking the maximum power from the PV array.
Abstract: This paper proposes a high performance, single-stage inverter topology for grid connected PV systems. The proposed configuration can not only boost the usually low photovoltaic (PV) array voltage, but can also convert the solar dc power into high quality ac power for feeding into the grid, while tracking the maximum power from the PV array. Total harmonic distortion of the current, fed into the grid, is restricted as per the IEEE-519 standard. The proposed topology has several desirable features such as better utilization of the PV array, higher efficiency, low cost and compact size. Further, due to the very nature of the proposed topology, the PV array appears as a floating source to the grid, thereby enhancing the overall safety of the system. A survey of the existing topologies, suitable for single-stage, grid connected PV applications, is carried out and a detailed comparison with the proposed topology is presented. A complete steady-state analysis, including the design procedure and expressions for peak device stresses, is included. Necessary condition on the modulation index "M" for sinusoidal pulsewidth modulated control of the proposed inverter topology has also been derived for discontinuous conduction mode operation. All the analytical, simulation and experimental results are presented.

636 citations


"A Single-Stage Grid-Connected High ..." refers background or methods in this paper

  • ...TSCS has drawbacks such as less reliability (owing to more number of components), more losses, large size and high cost [3]....

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  • ...In this paper for both simulation and experimental conditions, fc is taken as one tenth of switching frequency (fs) [3]....

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  • ...Let δVpv be the maximum value of the permissible ripple in the PV voltage and fg be the grid voltage fundamental frequency, then the design value of capacitor (Cp ) is given by [3]...

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Journal ArticleDOI
TL;DR: In this article, a high step-up converter with a coupled-inductive switch is investigated, where a passive regenerative snubber is utilized for absorbing the energy of stray inductance so that the switch duty cycle can be operated under a wide range, and the related voltage gain is higher than other coupled inductor-based converters.
Abstract: In this study, a high step-up converter with a coupled-inductor is investigated. In the proposed strategy, a coupled inductor with a lower-voltage-rated switch is used for raising the voltage gain (whether the switch is turned on or turned off). Moreover, a passive regenerative snubber is utilized for absorbing the energy of stray inductance so that the switch duty cycle can be operated under a wide range, and the related voltage gain is higher than other coupled-inductor-based converters. In addition, all devices in this scheme also have voltage-clamped properties and their voltage stresses are relatively smaller than the output voltage. Thus, it can select low-voltage low-conduction-loss devices, and there are no reverse-recovery currents within the diodes in this circuit. Furthermore, the closed-loop control methodology is utilized in the proposed scheme to overcome the voltage drift problem of the power source under the load variations. As a result, the proposed converter topology can promote the voltage gain of a conventional boost converter with a single inductor, and deal with the problem of the leakage inductor and demagnetization of transformer for a coupled-inductor-based converter. Some experimental results via examples of a proton exchange membrane fuel cell (PEMFC) power source and a traditional battery are given to demonstrate the effectiveness of the proposed power conversion strategy.

540 citations

Journal ArticleDOI
TL;DR: In this article, a Z-source inverter system for a split-phase grid-connected photovoltaic system is proposed, and the operation principle, control method, and characteristics of the system are presented.
Abstract: This paper proposes a Z-source inverter system for a split-phase grid-connected photovoltaic system. The operation principle, control method, and characteristics of the system are presented. A comparison between the new and traditional system configurations is performed. Simulation and experimental results are also shown to verify the proposed circuit and analysis

500 citations


"A Single-Stage Grid-Connected High ..." refers background in this paper

  • ...A single stage topology with MPPT is proposed in [7], which uses an impedance network and shoot through states of inverter to get boost operation....

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Journal ArticleDOI
TL;DR: In this article, a comprehensive review of step-up single-phase non-isolated inverters suitable for ac-module applications is presented, where the selected solutions are designed and simulated complying with the benchmark obtaining passive and semiconductor components ratings.
Abstract: This paper presents a comprehensive review of step-up single-phase non-isolated inverters suitable for ac-module applications. In order to compare the most feasible solutions of the reviewed topologies, a benchmark is set. This benchmark is based on a typical ac-module application considering the requirements for the solar panels and the grid. The selected solutions are designed and simulated complying with the benchmark obtaining passive and semiconductor components ratings in order to perform a comparison in terms of size and cost. A discussion of the analyzed topologies regarding the obtained ratings as well as ground currents is presented. Recommendations for topological solutions complying with the application benchmark are provided.

475 citations


"A Single-Stage Grid-Connected High ..." refers background in this paper

  • ...Several two stage grid connected PCS are presented in [2]....

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