A lyapunov‐based adaptive voltage controller for a grid connected PV system

Abstract

A new Lyapunov-based adaptive controller (LBAC) for a single stage three-phase gridconnected PV system (GCPVS) is proposed here. The uncertainties in solar irradiation affects the performance of the GCPVS. Further, ageing in the DC-link capacitor affects the PV voltage tracking. To achieve an improved performance of the GCPVS under both high and low irradiation, and under an aged DC-link capacitor, a new LBAC scheme has been proposed to control the PV voltage. In this LBAC, the gains of the controller are adapted online by a Lyapunov-based adaptation mechanism to provide the nominal tracking response of PV voltage. Further, a maximum power point tracking algorithm and grid current controllers are designed to transfer the maximum PV power to the grid, ensuring good power quality. As a result, improved performances of the GCPVS are achieved in terms of low PV voltage ripple, enhancement of delivered grid energy, and low grid current total harmonics distortion (THDs). Computer simulation studies are carried out in MATLAB/Simulink environment to verify the effectiveness of the proposed LBAC. Further, experiments are performed in a 2.5 kW GCPVS prototype for real time implementation of the proposed controller. The total harmonics distortion (THD) of grid currents is found to be within IEEE-1547 standards.This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

A state‐of‐the‐art comprehensive review of modern control techniques for grid‐connected wind turbines and photovoltaic arrays distributed generation systems

“…The important state‐of‐the‐art control techniques for the dc‐link VC in the GSC CBs of Types I and II are PI [98, 99], adaptive PI control [100], ANFIS control [101], PBSMC [102], LBAC [103] and FLC [104]. The GSC CB implemented using linear control techniques, for example, PI control [91], offers an appropriate steady‐state performance, for example, a reduced THD of 0.99% in the grid‐side current (i.e.…”

“…The presented reduced THD of I pgabc is 1.54% at the solar irradiance of 1000 W/m 2 which is higher than that achieved with the traditional PI control, that is, 0.99% [99]. Also, the proposed LBAC‐based GSC CB [103] causes a further increased THD of I pgabc , that is, 3.96% if the irradiance level goes to 400 W/m 2 . On the other hand, the proposed GSC CB [103] achieves a reduced settling time of 0.02 s, which is significantly smaller than that obtained with the PI control, that is, 0.090 s [99].…”

“…The important control techniques to implement the MPPT in the Types I and II are perturb and observe (P&O) [87], incremental conductance (IC) [88], steady output/fast tracking (SOFT) [89], multi-variable P&O (MV-P&O) [90], FLC [91], ANFIS [92], overall distribution (OD)-PSO [93], PSO-genetic algorithm (PSO-GA) [94], GWO [95], fusion firefly (FF) [96] and chaotic flower pollination (CFP) [97]. The dc-link VC for the GSC CB of Types I and II is mostly applied using PI control [98,99], adaptive PI control [100], ANFIS [101], proxy-based SMC (PBSMC) [102], Lyapunov-based adaptive control (LBAC) [103] and FLC [104]. Also, the QC of the GSC CB is mostly realized using PI control [98,105].…”

Guest editorial: Selected extended papers from the Michael Faraday IET International Summit—2020 Kolkata

“…Committee members of IET Kolkata Network, IET Communities Committee-South Asia, Country Head of IET India and all expert reviewers for the issue. Surajit Chattopadhyay 1 Naran Pindoriya 2 1 Kolkata Local Network, IET Communities Committee-South Asia, Kolkata, West Bengal, India 2 Indian Institute of Technology Gandhinagar, Gandhinagar, Gujarat, India Correspondence Surajit Chattopadhyay, Kolkata Local Network, IET Communities Committee-South Asia, Kolkata, West Bengal, India. Email: surajitchattopadhyay@gmail.com…”

“…Committee members of IET Kolkata Network, IET Communities Committee-South Asia, Country Head of IET India and all expert reviewers for the issue. Surajit Chattopadhyay 1 Naran Pindoriya 2 1 Kolkata Local Network, IET Communities Committee-South Asia, Kolkata, West Bengal, India and National journals and conferences and four books and has received many best paper awards. Presently, he is with the GKCIET, WB, India.…”