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A control topology for frequency regulation capability in a grid integrated PV system

100%

Kumar R. , Sahu B. , Shiva C. K. , Rajender B.

tom Vol. 69, nr 2

389--401

Photovoltaic (PV) cells are very costly because of the silicon element which is not cheaply available. Usually, PV cells are preferred to be used at maximum efficiency. Therefore, PV plants are emphasized to extract maximum power from PV cells. When inertia free PV plants are integrated into the grid in large numbers, the problem of maintaining system stability subjected to load perturbation is quite difficult. In response to this, a control topology is being an approach to make available the PV cells in maintaining system stability by utilizing the system frequency deviation as feedback to the controller. To implement this, the PVs are operated at Maximum Power Point Tracking (MPPT). This allows the PV to operate at Pseudo Maximum Power Point tracking (PMPPT) which makes it possible to run the PV with reserve power capacity without employing a battery for storage. The control strategy has been implemented over a two-stage power conversion model of the PV system. The simulation results showed that the proposed control PMPPT topology is effective in frequency regulation capability as compared to the MPPT technique.

Modeling and Simulation of Five-level Five-phase Voltage Source Inverter for Photovoltaic Systems

86%

Rajkumar A. V. , Monoharan P. S.

2013

tom R. 89, nr 10

237-241

This paper presents a space vector pulse width modulation (SVPWM) control for a five-level five-phase cascaded H-bridge multilevel inverter (CHMLI) for photovoltaic (PV) systems. The maximum power point tracking (MPPT) is solved by fuzzy logic controller (FLC) and it is capable of extracting maximum power from PV array connected to each DC link voltage level. The fuzzy MPPT is integrated with the inverter so that a DC-DC converter is not needed and the output shows accurate and fast response. This is done to achieve high dynamic performance with low total harmonic distortion (THD). The simulation results are compared with sinusoidal pulse width modulation (SPWM) controlled CHMLI and diode clamped multilevel inverter (DCMLI) in terms of THD. The results prove the viability and verify the effectiveness and accuracy of the proposed system.

W artykule zaprezentowano pięciopoziomowy, pięciofazowy kaskadowy przekształtnik CHMLI z modulacja szerokości impulsu SVPPWM przystosowany do pracy w układach fotowoltaicznych. Do śledzenia maksimum mocy zastosowano sterownik fuzzy logic FLC. Otrzymano dobre właściwości dynamiczne i mały poziom zniekształceń.