Leakage Current Paths in PV Transformer-Less Single-Phase Inverter Topology and Its Mitigation through PWM for Switching

2015 ◽  
Vol 6 (1) ◽  
pp. 148
Author(s):  
M. N. H. Khan ◽  
K. J. Ahmad ◽  
S. Khan ◽  
M. Hasanuzzaman
Keyword(s):  
Leakage Current ◽  
Single Phase ◽  
Current Issue ◽  
Cost Effective ◽  
Parasitic Capacitance ◽  
Phase Inverter ◽  
Simulation Results ◽  
Single Phase Inverter ◽  
Distribution Generation ◽  
Inverter Topology

<p>The Photovoltaic (PV) is a part and parcel and well known for cost-effective and easy to operatefeatures when it is used with transformer-less inverter-based grid-tied distribution generation systems. It reduces the leakage current issue that actually occurs making paths from PV penal to ground. In this paper has been addressed this issue as main problem for reducing leakage current. Moreover, here iscompared the proposed topology’s results to AC and DC-based transformer-less topologies. The possibilities of larger number of leakage current paths indicatepower loss, which is the focus of work in this paper for different switching conditions. The results on leakage current paths using PSpice with different parasitic capacitance values from inverters of different topologies are compared with the simulation results of the topology proposed in this paper.</p>

scholarly journals Adaptive proportional integral controller based on ann for dc link voltage control single-phase inverter connected to grid

2021 ◽  
Vol 2 (2) ◽  
pp. C20A22-1-C20A22-6
Author(s):  
Mamadou Traore ◽  
◽  
Alphousseyni Ndiaye ◽  
Amadou Ba ◽  
Senghane Mbodji ◽  
...  
Keyword(s):  
Neural Networks ◽  
Single Phase ◽  
Harmonic Distortion ◽  
Pv System ◽  
Phase Inverter ◽  
Proportional Integral ◽  
Integral Controller ◽  
Proportional Integral Controller ◽  
Simulation Results ◽  
Single Phase Inverter

The output power of the inverter of a PV system is directly affected by the DC-link voltage. Hence an adaptive Proportional Integral controller based on Artificial Neural Networks is developed in this paper. MATLAB/Simulink is used for the simulation of the studied system in order to evaluate the performance of the proposed methods. Simulation results show that the proposed API-ANN is faster to track the DC-link voltage than the conventional method. The injected harmonics to the grid were significantly reduced with API-ANN (0.08 % of total harmonic distortion) in comparison with the classic PI with 4.23 %. The API-ANN gives a good performance than the classic PI.

scholarly journals Analisis Arus Bocor pada Sistem PLTS Terhubung ke Jaringan Tanpa Transformator Terhadap Keselamatan Manusia

Electrician ◽  
2020 ◽  
Vol 14 (3) ◽  
pp. 95-99
Author(s):  
Diah Permata ◽  
Hekson Yulian N ◽  
Endah Komalasari
Keyword(s):  
Leakage Current ◽  
Parasitic Capacitance ◽  
Matlab Simulation ◽  
Pv System ◽  
Common Mode ◽  
Phase Inverter ◽  
Pv Panel ◽  
Simulation Results ◽  
Current Inverter ◽  
Maximum Limit

Intisari — Sistem PLTS yang terhubung ke jaringan tanpa transformator merasakan arus bocor akibat adanya kapasitansi parasitik pada panel surya yang diketanahkan dan hubungan galvanis antara sumber DC dan jaringan. Arus bocor berbahaya bagi keselamatan manusia yang menyentuh panel surya. Penelitian ini menghitung arus bocor melalui simulasi menggunakan Matlab. Rangkaian simulasi terdiri dari sumber DC PLTS, inverter satu fasa, sumber AC jaringan, filter dan kapasitansi parasitik. Kapasitansi Parasitik dimodelkan dengan sebuah kapasitor tunggal. Kondisi panel basah atau kering memberikan nilai kapasitansi yang berbeda. Hasil simulasi menunjukkan bahwa kondisi panel basah menghasilkan arus bocor sepuluh kali lebih tinggi dari kondisi panel kering. Arus bocor pada kedua kondisi masih dibawah batas maksimum standar keselamatan mengacu pada DIN VDE 0126-1-1.Kata kunci — arus bocor, PLTS, kapasitansi parasit, arus common mode, inverter.Abstract — PV system on grid transformerless experiences leakage current due to parasitic capacitance on grounded-PV panel and a galvanic connection between the grid and the dc source. Leakage current is harmful for human who touch the PV panel. This research calculates the leakage current via simulation using Matlab. Simulation circuit consists of DC source as PV system, one phase inverter, grid AC source, filter and parasitic capacitance. A single capacitor is used to model parasitic capacitance. Wet and dry condition of PV panel generate a different capacitance. The simulation results show wet PV panel produce a leakage current ten times higher than that in dry PV panel. The leakage curent either in wet and drycondition are below maximum limit of DIN VDE 0126-1-1 safety standard.Keywords— leakage current, PV system, parasitic capacitance, common mode current, inverter.

scholarly journals Research on an Improved Single-Phase Unisolated Grid-Connected Photovoltaic Inverter

2021 ◽  
Vol 23 (2) ◽  
pp. 123-130
Author(s):  
Baoge Zhang ◽  
Deyu Hong
Keyword(s):  
Leakage Current ◽  
Single Phase ◽  
Current Problem ◽  
Input Voltage ◽  
Common Mode ◽  
Common Mode Voltage ◽  
Voltage Clamping ◽  
The Common ◽  
Simulation Results ◽  
Inverter Topology

An improved single-phase unisolated grid-connected photovoltaic inverter topology is proposed to solve the common mode leakage current problem of unisolated grid-connected photovoltaic inverters. By analyzing the topology structure and voltage clamping principle of the improved inverter, the topology can maintain the same low input voltage as the full-bridge inverter, and ensure that the common-mode voltage in the continuation mode is clamped to the midpoint voltage of the bus, so as to effectively reduce the common-mode leakage current caused by the common-mode voltage suspension in the continuation mode. Moreover, the common-mode leakage current of the improved topology is smaller than that of the traditional H6-2D topology at similar conversion efficiency. The simulation results on MATLAB /Simulink platform show that the topology is feasible and effective.

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