Nonlinear adaptive control design with average performance analysis for photovoltaic system based on half bridge shunt active power filter. (February 2021)

• Record Type: Journal Article
• Authors: Hekss, Zineb; Abouloifa, Abdelmajid; Lachkar, Ibtissam; Giri, Fouad; Echalih, Salwa; Guerrero, Josep M.
• Is Part Of: International journal of electrical power & energy systems. Volume 125(2021)
• Publication Date: 2021-02
• Subjects: SAPF Shunt active power filter -- PFC Power factor correction -- MPPT Maximum power point tracking -- PI Proportional-integral -- PCC Point of common coupling -- PV Photovoltaic -- MPP Maximum power point -- PO Perturb and observe -- IGBT Insulated-gate bipolar transistor -- PWM Pulse width modulation principle -- IC Incremental conductance -- THD Total harmonic distortion; Shunt active power filter -- Photovoltaic system -- Adaptive observation -- Nonlinear control -- Averaging theory -- Lyaponuv stability; Electrical engineering -- Periodicals; Electric power systems -- Periodicals; Électrotechnique -- Périodiques; Réseaux électriques (Énergie) -- Périodiques; Electric power systems; Electrical engineering; Periodicals; 621.3
• DOI: 10.1016/j.ijepes.2020.106478
• Languages: English
• ISSNs: 0142-0615

Abstract

Highlights: The study focusses on the control development of renewable energy system constituted of a single-phase half-bridge SAPF and a couple PV arrays. A double loop cascaded structure was adopted to deal with the control design problem. The cascade controller is completed with an adaptive observer that performs online estimation of the grid state variables, which are not accessible to measurements. An average large signal model is used for the stability analysis. Practical cases are considered in simulation to prove the control performances. Abstract: This paper investigates the problem of controlling a single phase shunt active power filter (SAPF) connected to two photovoltaic arrays through a half bridge inverter involving two DC link capacitors. The control aims are threefold: ensuring a satisfactory power factor correction (PFC) at the grid-power filter connection point by compensating the harmonic and reactive currents produced by the nonlinear loads; extracting a maximum active power in the output photovoltaic arrays by applying the maximum power point tracking (MPPT) block and balancing the power exchange between the photovoltaic source and the AC power grid by regulating the DC link capacitors voltages. The problem is dealt with using a cascade nonlinear adaptive controller. The inner loop is designed using sliding mode and Lyapunov stability techniques so that to ensure a unity power factor. It also includes an adaptive observer that performs online estimation of the grid state variables which are not accessible to measurements. The outer loop is mainly constituted of filtered proportional-integral (PI) regulator, that ensures a tight regulation of the photovoltaic voltage, and the incremental conductance (IC) algorithm to meet MPPT. The resulting controller performances are formally analyzed making use of averaging theory. The theoritical analysis results are confirmed by numerical simulation within MATLAB/SimPowerSystems environment.