Analysis and Control of a Novel Transformer-Less Microinverter for PV-Grid Interface

Rajeev, Mini; Agarwal, Vivek

doi:10.1109/jphotov.2018.2825298

Cited by 40 publications

(23 citation statements)

References 24 publications

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“…where K p , K i are the gain constants, ω r corresponds to resonant cutoff frequency, and τ i is the time constant. The time and gain constants of the PR regulator are calculated by following the steps below [26]:…”

Section: Inner Control Loopmentioning

confidence: 99%

Data Description Technique-Based Islanding Classification for Single-Phase Grid-Connected Photovoltaic System

Haque

Alshareef

Khan

et al. 2020

Sensors

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This paper develops an islanding classification mechanism to overcome the problems of non-detection zones in conventional islanding detection mechanisms. This process is achieved by adapting the support vector-based data description technique with Gaussian radial basis function kernels for islanding and non-islanding events in single phase grid-connected photovoltaic (PV) systems. To overcome the non-detection zone, excess and deficit power imbalance conditions are considered for different loading conditions. These imbalances are characterized by the voltage dip scenario and were subjected to feature extraction for training with the machine learning technique. This is experimentally realized by training the machine learning classifier with different events on a 5 kW grid-connected system. Using the concept of detection and false alarm rates, the performance of the trained classifier is tested for multiple faults and power imbalance conditions. The results showed the effective operation of the classifier with a detection rate of 99.2% and a false alarm rate of 0.2%.

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Section: Inner Control Loopmentioning

confidence: 99%

Data Description Technique-Based Islanding Classification for Single-Phase Grid-Connected Photovoltaic System

Haque

Alshareef

Khan

et al. 2020

Sensors

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“…Compared with converters introduced in [32, 33], the proposed converter has a similar number of switching devices, and the proposed converter adopts another idea to realise both boost and inversion. Compared with converters introduced in [34, 35], the proposed converter has fewer switching devices, which is beneficial to reduce the conduction loss and switching loss and improve the conversion efficiency.…”

Section: Steady‐state Analysis Of the Proposed Invertermentioning

confidence: 99%

“…Also, the inverter requires two transformers, increasing the volume of generation system. Many step-up inverters without transformers are studied in [32][33][34][35], these inverters can output AC voltage higher than input DC voltage, and restrain the leakage current.…”

Section: Introductionmentioning

confidence: 99%

Integrated step‐up non‐isolated inverter with leakage current elimination for grid‐tied photovoltaic system

Liang

Gao

et al. 2019

IET Power Electronics

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This study presents a non-isolated step-up inverter without leakage current for low-voltage renewable energy generation such as photovoltaic (PV) cells grid connection. From the structure of the proposed inverter, the negative terminal of the PV array is directly linked with the grid neutral, so the common mode voltage of the parasitic capacitance can be kept constant and the leakage current will not be generated in theory. Moreover, this transformerless inverter can produce an AC output voltage higher than the input DC voltage, which will reduce the sizes of the generation system. A switching modulation strategy carrier-based is analysed in detail when the input inductor current is operated in discontinuous conduction mode. The operation modes of the proposed inverter are also discussed, respectively, in positive and negative half line cycles. Finally, a digital experimental prototype is tested in the laboratory, and the experimental results are consistent with the theoretical analysis.

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“…However, passive filters are not efficient in removing harmonics [8][9][10][11][12][13]. It is more effective to include the feedback control system into the structure of the microinverter for tracking of the sinusoidal reference to guarantee the sinus shape of the output current and to minimize the steady-state error between the actual output current and the current reference [14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

“…The most popular controllers used for tracking of the grid-connected inverter output current are proportional-integral (PI) [19][20][21][22][23][24][25], proportional-integral-derivative (PID) [3,21,26,27], and proportional-resonant (PR) [2,15,21,[28][29][30][31][32] controllers. However, more sophisticated predictive current controllers can be used as well [4,33,34].…”

Section: Introductionmentioning

confidence: 99%

Controller for the Grid-Connected Microinverter Output Current Tracking

2020

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The modification of the proportional–integral (PI) controller with the variable proportional constant for tracking of the grid-connected photovoltaic microinverter output current has been proposed. The obtained results show that in the case when the proportional constant of the PI controller varies in time according to the appropriate law, the microinverter output current sinus shape distortions decrease as compared to the case when the ordinary PI controller is used. The operation of the microinverter with the proposed controller was investigated for the cases when the electrical grid voltage sinus shape is not distorted and when it is distorted by the higher harmonics.

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Analysis and Control of a Novel Transformer-Less Microinverter for PV-Grid Interface

Cited by 40 publications

References 24 publications

Data Description Technique-Based Islanding Classification for Single-Phase Grid-Connected Photovoltaic System

Data Description Technique-Based Islanding Classification for Single-Phase Grid-Connected Photovoltaic System

Integrated step‐up non‐isolated inverter with leakage current elimination for grid‐tied photovoltaic system

Controller for the Grid-Connected Microinverter Output Current Tracking

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