An Improved Lyapunov Function Based Control Strategy for Multitasking Distributed PV Inverter
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ORIGINAL CONTRIBUTION
An Improved Lyapunov Function Based Control Strategy for Multitasking Distributed PV Inverter Pappula Sampath Kumar1
Received: 21 April 2020 / Accepted: 21 October 2020 The Institution of Engineers (India) 2020
Abstract The ELF (Extended Lyapunov Function) based control approach for single phase two-stage multitasking PV (photovoltaic) inverter is demonstrated in this paper. The introduced PV inverter can operate under the uncertainty of non-linear loads and PV characteristic beyond giving the closed feedback system stability analysis. The two stage PV inverter is introduced, in initial step a boost circuit is used to harnessing of crest power at PV panel side. Here time ratio of the boost circuit is planed with adaptive INC (Incremental Conductance Method). In the secondary step, the control of grid connected VSI (Voltage Source Inverter) is managed by ELF (Extended Lyapunov Function) strategy. To get best dynamic response, difference of PV feed forward to the loss component of DC bus capacitor. Other side, control of VSI and maintain stability of PV inverter, the ELF technique is reduces error in-between input and output, with there is no disturbance of equilibrium point in PV inverter. The PV inverter performance observed at changing of insolation and load variations using MATLAB /simulation. Various simulation results are presented to validate the harmonics compensation strategy. Keywords Single phase PV panel INC based MPPT-(maximum power point tracking) Power quality ELF based control strategy Voltage source converter (VSC)
& Pappula Sampath Kumar [email protected] 1
Department of Electrical and Electronics Engineering, Bapatla Engineering College, Bapatla, India
Introduction Due to the vanishing and high cost of conventional sources, the grid with PV (photovoltaic) inverter is getting more demand. First the idea comes on non-conventional source because of it saves environment and meet the electrical demand [1]. At present the distribution system adapts healthy environmental energy sources such as PV and wind, except this sources remaining causes of pollution. By comparing the conventional sources, the solar power is more economical, loss less and echo friendly energy system. The PV solar cost per watt is already mentioned by different authors [2] including total cost, the overall output power from the cell is improved, it improves the final efficiency of total solar PV system. Not only, the success of technology is mainly depends on its performance, cost and system maximum output with low loss. Here the PV system is mainly classified into standalone other is grid connected system [3]. In case of PV standalone inverter the battery banks are used to reserve the extracted PV system not only, management of power is main task in case of standalone system. In [4] the battery type PV system are mentioned. By considering the issue associated with battery storage, grid tied solar inverters have more efficient, but the grid current is accessible. In case of grid connec
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