Sliding mode controller‐based voltage source inverter for power quality improvement in microgrid. Issue 11 (3rd July 2020)

• Record Type: Journal Article
• Authors: Rajakumar, Vinifa; Anbukumar, Kavitha; Selwynraj A, Immanuel
• Is Part Of: IET renewable power generation. Volume 14:Issue 11(2020)
• Page Start: 1860
• Page End: 1872
• Publication Date: 2020-07-03
• Subjects: power grids -- power supply quality -- power convertors -- distributed power generation -- power generation control -- variable structure systems -- power factor -- power harmonic filters -- renewable energy sources -- invertors -- power electronics -- harmonic distortion -- active filters -- control nonlinearities -- voltage‐source convertors -- reactive power -- load flow control; sliding mode controller‐based voltage source inverter -- power quality improvement -- control technologies -- power electronics -- renewable energy sources -- high performance power electronic converters -- grid interfacing inverter -- shunt active power filter -- power conversion operation -- hysteresis method -- equivalent control method -- power flow control -- renewable energy system -- reactive power -- control law -- single‐phase equivalent circuit -- three‐phase voltage source inverter -- integral sliding surface -- grid current -- unity power factor -- balanced grid voltage conditions -- unbalanced grid voltage conditions -- equivalent control function -- RES power -- power quality issues -- microgrid -- SMC techniques -- relay method -- signum method -- complexity reduction -- total harmonic distortion -- THD -- nonlinear loads -- chattering; Renewable energy sources -- Periodicals; 333.79405
• DOI: 10.1049/iet-rpg.2019.1305
• Languages: English
• ISSNs: 1752-1416

Abstract

Abstract : Development of control technologies facilitates the integration of renewable energy sources to the grid through power electronic converters. In this study, the inverter acts as shunt active power filter along with the power conversion operation. Various sliding mode control (SMC) techniques namely relay and signum method, hysteresis method and equivalent control method are implemented to control the real, and reactive power flow between Renewable Energy System (RES), load and grid using an inverter. To reduce the complexity, the control law ( u eq ) for equivalent control method is derived using a simple single‐phase equivalent circuit of a three‐phase voltage source inverter. In this study, the robustness is enhanced by choosing the integral sliding surface. These controllers are used to reduce the total harmonic distortion (THD) and to ensure unity power factor (PF) in the grid during balanced and unbalanced grid voltage conditions even in the existence of nonlinear loads. The SMC using equivalent control function outperforms the other methods in terms of chattering, THD and PF. To illustrate the effectiveness, three different modes are considered: (i) no RES power, (ii) insufficient RES power and (iii) excess RES power. The performance of controllers is validated by the simulation and experimental results.