Performance analysis of new type grid-tied inverter-Aalborg Inverter

Wu, Weimin; Wang, Zhen; Ji, Junhao; Blaabjerg, Frede

doi:10.1109/epe.2014.6910861

Cited by 11 publications

(6 citation statements)

References 16 publications

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“…Typical values of Δi L X (X = 1, 2) lie in the range of 10% to 20% of the full-load [32]. In this paper P O_max = 800 W, V g = 110 V, T S = 1/40 k, and suppose the current ripple Δi L X is (13) By combining (12) and ( 13), when the inverter works in pure "Buck" mode and D = 0.5, the minimum DC inductor (L 1 or L 2 ) can be calculated as…”

Section: (10)mentioning

confidence: 99%

“…Similar to the conventional dual mode time-sharing inverters [10], [11], since only one power stage chops at high frequency at any time, the minimum switching power losses and high efficiency of the Aalborg inverter can be realized. Meanwhile, a low drop voltage across the filtering inductors in power loop can further reduce the power losses [12]. So this type of inverter is suitable for the connection between power grids and PV arrays.…”

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confidence: 99%

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A Modified Aalborg Inverter Extracting Maximum Power From One PV Array Source

Wang

Shuai

et al. 2019

CPSS TPEA

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Distributed Photovoltaic Generation (DPVG) systems have become more important in recent years because of energy pinch and air pollution. Grid-tied inverters, as the indispensable parts of the DPVG systems, have drawn a lot of research attentions. Among various constructors, the Aalborg inverter was proposed as a candidate for the interface between the PV arrays and the power grid for some potential advantages, such as the wide range of input DC voltages, high efficiency, low cost and no leakage current. For a conventional Aalborg inverter, however, in order to gain a symmetrical gird-injected current, when the input DC voltages generated by the PV arrays are not equal, part of the input DC energy has to be discarded, which will reduce the conversion efficiency of the whole system. In this paper, a modified Aalborg inverter with a single input DC source is proposed to extract the maximum DC energy of PV arrays. The operating principle is illustrated via equivalent circuits. The control strategy is designed to balance the capacitor voltages and smooth the gridinjected current. A 110 V/50 Hz/800 W prototype has been built to verify the validity of the proposed inverter together with the effectiveness of the control strategy. Index Terms-Aalborg inverter, Buck-Boost, maximum power piont tracking (MPPT), photovoltaic system, voltage balance. I. IntroductIonW ITH the development of global economy and the increase of population, environmental pollution and energy shortage are becoming increasingly serious. Distributed Photovoltaic Generation (DPVG), as one of the most important renewable energy resources, has experienced dramatic growth worldwide due to its environmental friendliness [1]-[3]. The grid-tied inverters, connecting the power grid with PV arrays, play an integral role in DPVG systems and have been investigated [4]-[6]. Owning to the advantages of low cost,

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Section: (10)mentioning

confidence: 99%

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confidence: 99%

A Modified Aalborg Inverter Extracting Maximum Power From One PV Array Source

Wang

Shuai

et al. 2019

CPSS TPEA

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“…At the same time all of them did not find industrial application. For example, the solution [26] requires reverse-blocking IGBTs, while others are quite complex solutions.An Aalborg inverter ( Figure 1b) is proposed as an inverter that combines buck and boost functionality [30][31][32][33][34][35]. These solutions have two independent buck-boost stages that are responsible for output sinusoidal voltage generation.…”

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confidence: 99%

Bidirectional Twisted Single-Stage Single-Phase Buck-Boost DC-AC Converter

et al. 2019

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This paper describes a bidirectional twisted single-phase single-stage buck-boost dc-ac converter based on an output unfolding circuit. This solution is derived by the combination of an inverting buck-boost dc-dc converter and an unfolding circuit. The operation principle, component design guidelines, along with the control approach are presented. The zero-crossing distortion problem is discussed and solved by a simple approach. The simulation and experimental results confirm all theoretical statements. Loss distribution and achievable efficiency are analyzed. Finally, the pros and cons of the proposed solution, along with the most promising application field, are analyzed and discussed in the conclusion.Another application field of the dc-ac converter with wide input voltage regulation is battery storage. Lithium-ion batteries are targeted to become the most popular choice for on-grid and grid-off solar battery storage in the foreseeable future. Such types of batteries have a wide range of input voltage. A converter that accepts different storage elements is preferable.Several single-stage alternatives were presented as alternative solutions. Inverters with an active boost cell were described in [6][7][8][9]. These inverters provide very high boost of the input voltage but suffer from high current spikes in the semiconductors and passive elements. Impedance-source networks have been reported in many research papers as a promising single-stage solution. Z-source inverters (ZSIs) and quasi-Z-source inverters (qZSIs) were proposed for different applications. Existing solutions were reviewed in [10][11][12][13][14], and different relevant issues are addressed in [15][16][17][18][19][20]. However, recent research revealed evident drawbacks of the IS-based converters in terms of power density and efficiency [21][22][23].Split-source inverters (SPIs) [24,25] were proposed as another alternative solution. According to the literature, SPIs have less passive component counts accompanied by higher voltage and current stresses at lower voltage gains, and they do not have short circuit immunity.Several interesting single-stage buck-boost inverters were proposed in [26][27][28][29]. At the same time all of them did not find industrial application. For example, the solution [26] requires reverse-blocking IGBTs, while others are quite complex solutions.An Aalborg inverter ( Figure 1b) is proposed as an inverter that combines buck and boost functionality [30][31][32][33][34][35]. These solutions have two independent buck-boost stages that are responsible for output sinusoidal voltage generation. The main advantage of the proposed solution is in the minimum voltage drop of the filtering inductors in the power loop at any time. At the same time, this solution uses a double number of semiconductors and an inductor in the buck and boost stage, which is an obvious drawback. Another drawback consists in the two power sources utilization. A similar idea with double components is discussed in [36].The solution based on the input boost a...

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“…Similar to the conventional dual mode time-sharing inverters [11]- [12], it has minimum switching power loss since only one power stage of this inverter chops at high frequency at any time. Furthermore, a voltage drop on the filtering inductor in the power loop can be decreased with the reduced size and power losses [10].…”

Section: Introductionmentioning

confidence: 99%

“…In order to achieve higher efficiency for photovoltaic (PV) inverter, recently, the MOSFET switch based inverters are becoming popular [5]- [9]. The Aalborg Inverter is a new family of high efficiency MOSFET switch based transformerless inverter operating with a wide variation of input DC voltage, which working states depend on the instantaneous difference between the input voltage and the output voltage [9], [10]. Similar to the conventional dual mode time-sharing inverters [11]- [12], it has minimum switching power loss since only one power stage of this inverter chops at high frequency at any time.…”

Section: Introductionmentioning

confidence: 99%

LLCL-filter based single-phase grid-tied aalborg inverter

Feng

et al. 2014

2014 International Power Electronics and Application Conference and Exposition

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Abstract-The Aalborg Inverter is a new type of high efficient DC/AC grid-tied inverter, where the input DC voltage can vary in a wide range. Compared with the LCL-filter, the LLCL-filter can save the total inductance for the conventional voltage source inverter. In this paper, an LLCL-filter based Aalborg Inverter is proposed and its character is illustrated through the small signal analysis in both "Buck" and "Buck-Boost" mode. From the modeling, it can be seen that the resonant inductor in the capacitor loop has not brought extra control difficulties, whereas more inductance in the power loop can be saved. Simulation and experiments are carried out to verify the analysis and the design through an 220 V/50 Hz, 2000 W prototype.

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Performance analysis of new type grid-tied inverter-Aalborg Inverter

Cited by 11 publications

References 16 publications

A Modified Aalborg Inverter Extracting Maximum Power From One PV Array Source

A Modified Aalborg Inverter Extracting Maximum Power From One PV Array Source

Bidirectional Twisted Single-Stage Single-Phase Buck-Boost DC-AC Converter

LLCL-filter based single-phase grid-tied aalborg inverter

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