High-Frequency-Link-Based Grid-Tied PV System With Small DC-Link Capacitor and Low-Frequency Ripple-Free Maximum Power Point Tracking

Shi, Yanjun; Li, Rui; Xue, Yaosuo; Li, Hui

doi:10.1109/tpel.2015.2411858

Cited by 170 publications

(76 citation statements)

References 23 publications

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“…Then, L LK is calculated using (32). Subsequently, the PV voltage ripple ∆V PV is calculated solving (41)- (44) to provide the acceptable value of the PV power ripple ∆P PV . Finally, parameter C L is calculated using (40).…”

Section: Design Of the Dab Converter For Pv Applicationsmentioning

confidence: 99%

“…In the literature, the DAB converter has been used in battery energy storage systems (BESS) [34][35][36], solid-state transformers [37][38][39] and fuel cell applications [40]. Concerning PV systems, the DAB converter has been used in [39,[41][42][43][44][45][46][47][48] to interface PV arrays in series connection, but the high voltage-conversion ratio capability has not been exploited in those works. Moreover, although many design considerations have been provided for the DAB converter [32,40,49], there is not reported a design method for a PV system based on the DAB converter.…”

Section: Introductionmentioning

confidence: 99%

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Design Method of Dual Active Bridge Converters for Photovoltaic Systems with High Voltage Gain

et al. 2020

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In this paper, a design method for a photovoltaic system based on a dual active bridge converter and a photovoltaic module is proposed. The method is supported by analytical results and theoretical predictions, which are confirmed with circuital simulations. The analytical development, the theoretical predictions, and the validation through circuital simulations, are the main contributions of the paper. The dual active bridge converter is selected due to its high efficiency, high input and output voltages range, and high voltage-conversion ratio, which enables the interface of low-voltage photovoltaic modules with a high-voltage dc bus, such as the input of a micro-inverter. To propose the design method, the circuital analysis of the dual active bridge converter is performed to describe the general waveforms derived from the circuit behavior. Then, the analysis of the dual active bridge converter, interacting with a photovoltaic module driven by a maximum power point tracking algorithm, is used to establish the mathematical expressions for the leakage inductor current, the photovoltaic current, and the range of operation for the phase shift. The design method also provides analytical equations for both the high-frequency transformer equivalent leakage inductor and the photovoltaic side capacitor. The design method is validated through detailed circuital simulations of the whole photovoltaic system, which confirm that the maximum power of the photovoltaic module can be extracted with a correct design of the dual active bridge converter. Also, the theoretical restrictions of the photovoltaic system, such as the photovoltaic voltage and power ripples, are fulfilled with errors lower than 2% with respect to the circuital simulations. Finally, the simulation results also demonstrate that the maximum power point for different environmental conditions is reached, optimizing the phase shift factor with a maximum power point tracking algorithm.

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Section: Design Of the Dab Converter For Pv Applicationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design Method of Dual Active Bridge Converters for Photovoltaic Systems with High Voltage Gain

et al. 2020

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“…. , N ports and j = a, b, c three phases (21) For N numbers of ports per phase, the total power to be processed in three phases should be: The dc-dc ML-DAB power equation for one port is as follows. Here α, β are assumed to be constant and φ varies according to MPPT control ( Figure 3):…”

Section: Dc-link Voltage Control Using Power Mismatch Among N Portsmentioning

confidence: 99%

A Modular Multilevel Converter with Power Mismatch Control for Grid-Connected Photovoltaic Systems

et al. 2017

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Abstract:A modular multilevel power converter configuration for grid connected photovoltaic (PV) systems is proposed. The converter configuration replaces the conventional bulky line frequency transformer with several high frequency transformers, potentially reducing the balance of systems cost of PV systems. The front-end converter for each port is a neutral-point diode clamped (NPC) multi-level dc-dc dual-active bridge (ML-DAB) which allows maximum power point tracking (MPPT). The integrated high frequency transformer provides the galvanic isolation between the PV and grid side and also steps up the low dc voltage from PV source. Following the ML-DAB stage, in each port, is a NPC inverter. N number of NPC inverters' outputs are cascaded to attain the per-phase line-to-neutral voltage to connect directly to the distribution grid (i.e., 13.8 kV). The cascaded NPC (CNPC) inverters have the inherent advantage of using lower rated devices, smaller filters and low total harmonic distortion required for PV grid interconnection. The proposed converter system is modular, scalable, and serviceable with zero downtime with lower foot print and lower overall cost. A novel voltage balance control at each module based on power mismatch among N-ports, have been presented and verified in simulation. Analysis and simulation results are presented for the N-port converter. The converter performance has also been verified on a hardware prototype.

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“…According to Femia et al, a 34‐kW boost converter with an inductance of 7.42 mH and switching frequency of 5 kHz has been designed and applied in each phase of PV system. Moreover, the dc‐link capacitance of single‐phase H‐bridge inverter is obtained from ,

C_{dc} = \frac{S}{_{g} V_{dc} V_{dc}},

where S = 37 kVA is the apparent power that flows through the single‐phase H‐bridge inverter, ω g = 120π is the fundamental angular frequency of the grid voltage, and V dc = 450V and V dc = 27V are the magnitude and maximum allowed ripple of the inverter dc‐link voltage, respectively.…”

Section: Proposed Structurementioning

confidence: 99%

A new method to point of common coupling voltage control in distribution grid-connected photovoltaic systems

Ghorbani

Mosallanejad

Mohamadian

2017

Int Trans Electr Energ Syst

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Summary Nowadays, in addition to providing active power to the local loads, photovoltaic systems are helping the grid to control the point of common coupling voltage. In this paper, a new version of instantaneous reactive power theory has been proposed to control the point of common coupling voltage. The advantages of using this method are the absence of phase‐locked loop and the application of simple calculations to raise the speed of the system response. Moreover, the proposed method is in such a way so that it allows the system to mitigate the symmetrical and asymmetrical voltage sag and swell; consequently, the quality of power delivered by photovoltaic system to the grid will be improved. On the other hand, the proposed structure, in addition to increasing the reliability of power injection, maintains providing of balanced active power in the presence of unbalanced reactive power without the need to additional controllers. To validate the proposed structure, the system has been tested on IEEE 33‐bus radial distribution grid and the results are presented from a dynamic simulation by using MATLAB/SIMULINK. According to the results, the proposed method regulates the point of common coupling voltage with a response time of about 0.2 second that is faster than conventional control strategies.

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High-Frequency-Link-Based Grid-Tied PV System With Small DC-Link Capacitor and Low-Frequency Ripple-Free Maximum Power Point Tracking

Cited by 170 publications

References 23 publications

Design Method of Dual Active Bridge Converters for Photovoltaic Systems with High Voltage Gain

Design Method of Dual Active Bridge Converters for Photovoltaic Systems with High Voltage Gain

A Modular Multilevel Converter with Power Mismatch Control for Grid-Connected Photovoltaic Systems

A new method to point of common coupling voltage control in distribution grid-connected photovoltaic systems

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