access icon free CC-ROGI-FLL based control for grid-tied photovoltaic system at abnormal grid conditions

© The Institution of Engineering and Technology
Received 18/05/2019, Accepted 20/05/2020, Revised 16/05/2020, Published 22/05/2020

This study presents a single stage grid-interfaced solar photovoltaic (SPV) system using a multifunctional complex coefficient reduced ordered generalised integrator (CC-ROGI) based frequency-locked loop (FLL) control. The main contributions of this study, include (i) the extrication of fundamental active components from load currents using CC-ROGI-FLLbased control to generate the reference grid currents for voltage source converter (VSC) switching, (ii) VSC works as a distribution static compensator, which performs multi-functions like harmonics mitigation, reactive power compensation, unity power factor operation and grid currents balancing, (iii) this CC-ROGI-FLL also extricates the fundamental grid voltages component even under grid voltage harmonic distortion and grid voltages unbalancing. Moreover, SPV power feed-forward component is assimilated in this control to reduce the oscillations in grid currents under variable irradiance. Simulated and experimental results show satisfactory behaviour of the system at different conditions like load unbalancing, variable solar irradiance and abnormal grid conditions. The comparative performance of CC-ROGI-FLL control with other FLL and phaselocked loop controls are shown in this study. This CC-ROGI-FLL control has manifested a good steady state performance and dynamic response. The total harmonic distortions of grid currents are found well within the limits of the IEEE-519 standard, even under abnormal grid conditions.

Inspec keywords: solar cell arrays; dynamic response; harmonic distortion; power generation control; IEEE standards; power supply quality; voltage-source convertors; phase locked loops; power distribution control; photovoltaic power systems; oscillations; reactive power; power grids; power factor; frequency locked loops; static VAr compensators; power system harmonics

Other keywords: dynamic response; photovoltaic array; distribution network; load currents; VSC; unity power factor operation; single stage grid-interfaced solar photovoltaic system; complex coefficient reduced ordered generalised integrator; frequency-locked loop control; VSC switching; phase-locked loop controls; IEEE-519 standard; active power generation; variable solar irradiance; voltage source converter switching; distribution static compensator; reactive power compensation; CC-ROGI-FLL control; grid voltage harmonic distortion; oscillations; sinusoidal reference grid currents; SPV power feed-forward component

Subjects: Solar cells and arrays; Power system control; Other power apparatus and electric machines; Power convertors and power supplies to apparatus; Photoelectric conversion; solar cells and arrays; Distribution networks; Control of electric power systems; Solar power stations and photovoltaic power systems; Power supply quality and harmonics

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