Leakage Current Elimination with Improved Non-Isolated Nine-Level Inverter for Grid-Connected PV Panels مقاله
Journal of Energy Management and Technology Summer 2017, Volume 1 - Number 2 (10 صفحه - از 46 تا 55)
In this paper, an improved structure with model predictive control (MPC) is presented to eliminate leakage current of grid-connected PV panels. The proposed topology consists of a PV panel in the input side, a non-isolated DC/DC multilevel boost converter and a nine-level inverter at the output side. The DCDC multilevel boost converter can provide equal voltage levels in different rated power by controlling duty-cycle. The utilized dc-dc converter can increase the output voltage of a PV panel to produce desired values at the input ports of the nine-level inverter. In Non-isolated grid-connected PV converters, there are parasitic capacitors between grid and PV panel which leads to the leakage current flowing through parasitic capacitors to the system. It causes a safety problem, injection of harmonic current to the grid, increasing losses, and efficiency reduction. In order to eliminate leakage current due to use of the parasitic capacitor of PV panel, MPC control method is utilized to achieve high overall efficiency. To confirm the operation of presented structure and theoretical analysis, PSCAD/EMTDC software is used. © 2017 Journal of Energy Management and Technologyخلاصه ماشینی:
"Leakage Current Elimination with Improved Non-Isolated Nine-Level Inverter for Grid-Connected PV Panels MOHAMMAD MAALANDISH1, SAEED POURJAFAR2, SEYED HOSSEIN HOSSEINI3, AND NAVID TAGHIZADEGHAN KALANTARI4 1,3Department of Electrical and Computer Engineering, University of Tabriz, Tabriz, Iran 2Department of Electrical and Computer Engineering, University of Sahand, Tabriz, Iran 4Department of electrical engineering, azarbaijan shahid madani university, tabriz, iran. JEMT1704-1008 In this paper, an improved structure with model predictive control (MPC) is presented to eliminate leak- age current of grid-connected PV panels. © 2017 Journal of Energy Management and Technology Grid-connected, Non-Isolated Converter, Multi-Level Inverter, Leakage Current, Model Predictive Controller. The proposed structure has advantages as follows: • Continuous input current • High voltage gain with lower duty-cycle • Same output and multilevel with one input PV panel • Reduction of leakage current • High efficiency Theoretical analysis are presented in section 2 and control method is discussed in the third section. The performance of the switches in the circuit is that in addition to producing half level dc link voltage, it can reduce the layout complexity comparatively with floating capacitors, diode clamp topology and hybrid structure that is mentioned in [24,25]. H. Hosseini, "A novel trans- formerless photovoltaic grid-connected current source in- verter with ground leakage current elimination," 2017 8th power electronics, drive systems technologies conference (PED- STC),Mashhad, pp. Kalaani, "Voltage ripple-based passive islanding detection technique for grid-connected photovoltaic inverters," IEEE Power and Energy Technology Systems Journal, vol. He, "Improved trans- formerless inverter with common-mode leakage current elimination for a photovoltaic grid-connected power sys- tem," IEEE Transactions on Power Electronics, vol."کلیدواژه ها:
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