access icon free Grid synchronisation framework for partially shaded solar PV-based microgrid using intelligent control strategy

© The Institution of Engineering and Technology
Received 19/12/2017, Accepted 11/10/2018, Revised 03/09/2018, Published 18/10/2018

This work introduces a novel damped fifth-order generalized integrator (DFOGI) based control algorithm for grid-integrated solar photovoltaic (PV) system. Moreover, for GMPPT (Global Maximum Power Point Tracking), HPO (Human Psychology Optimisation) algorithm is used. Here, a three-phase three wire, single-stage topology of grid-integrated partially shaded PV array is implemented. Global maximum power peak searching behavior of HPO algorithm is very rapid and accurate, which gives a satisfactory steady-state and dynamic performances, even in rapid solar irradiance change condition. The prime objective of proposed DFOGI control is to accurately transfer the solar power to the grid at unity power factor, even when grid suffers from abnormal and adverse conditions. During these conditions, on the grid side, the power quality is maintained, where the proposed control technique provides power factor correction, and harmonics mitigation. The proposed techniques are modeled, and their performances are verified experimentally on a developed prototype, in solar insolation variation conditions, as well as in different grid disturbances such as over and under-voltage, phase imbalance, harmonics distortion in the grid voltage etc. Test results have met the objectives of the proposed work and parameters are under the permissible limit, according to the IEEE-519 standard.

Inspec keywords: maximum power point trackers; photovoltaic power systems; harmonics suppression; power generation control; solar power stations; overvoltage; optimisation; power grids; intelligent control; power factor correction; distributed power generation; power supply quality; synchronisation

Other keywords: power quality; unity power factor; power factor correction; partially shaded solar PV-based microgrid; human psychology optimisation algorithm; solar irradiance change condition; phase imbalance; IEEE-519 standard; phase unbalance; grid-integrated partially shaded PV array; grid disturbances; harmonics mitigation; grid-integrated solar PV system; DFOGI-based control algorithm; solar power; novel damped fifth-order generalised integrator-based control algorithm; overvoltage; global maximum power peak searching behaviour; grid voltage; undervoltage; single-stage topology; grid-integrated solar photovoltaic system; three-phase three wire; grid synchronisation framework; HPO algorithm; global maximum power point tracking; voltage distortion; harmonics distortion; intelligent control strategy

Subjects: Power supply quality and harmonics; Neurocontrol; Fuzzy control; Control of electric power systems; Optimisation techniques; Optimisation techniques; Solar power stations and photovoltaic power systems; Power system management, operation and economics; Distributed power generation; DC-DC power convertors

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