FCS‐MPC for a single‐phase two‐stage grid‐connected PV inverter. Issue 4 (1st April 2019)

• Record Type: Journal Article
• Authors: Liu, Jiang; Cheng, Shanmei; Liu, Ying; Shen, Anwen
• Is Part Of: IET power electronics. Volume 12:Issue 4(2019)
• Page Start: 915
• Page End: 922
• Publication Date: 2019-04-01
• Subjects: power convertors -- electric current control -- voltage control -- photovoltaic power systems -- invertors -- power grids -- predictive control -- harmonic distortion; main objectives -- model predictive controller -- multivariables -- complex buck‐boost current controller -- optimal design calculation -- predictive current voltage -- state variables -- cost function formulation -- dc‐link capacitor -- control algorithm -- high‐frequency switches -- system performance -- output current -- dc‐link voltage -- FCS‐MPC method -- control strategy -- single‐phase two‐stage grid -- high‐efficiency inverter -- wide input voltage range -- distributed generation system -- high‐efficiency two‐stage topology -- finite‐control‐set model predictive control; Power electronics -- Periodicals; 621.31705
• DOI: 10.1049/iet-pel.2018.5676
• Languages: English
• ISSNs: 1755-4535

Abstract

Abstract : The high‐efficiency inverter in a wide input voltage range is expected to be a solution for the distributed generation system. This study gives a high‐efficiency two‐stage topology and proposes a finite‐control‐set model predictive control (FCS‐MPC) strategy. The main objectives of the proposed model predictive controller are: (i) simultaneously controlling multi‐variables in the complex buck‐boost current controller, (ii) optimal design calculation for predictive current and voltage, (iii) normalisation of the state variables for cost function formulation, and (iv) low correlation between the dc‐link capacitor and control algorithm. A more reasonable operation mode of high‐frequency switches is provided for the two‐stage topology improving system performance. In order to optimise the total harmonic distortion of the output current and the error of the dc‐link voltage, a suitable weighting factor could be designed in the proposed FCS‐MPC method. The steady‐state characteristics of the proposed controller are simulated based on MATLAB/Simulink. Experimental results demonstrate the validity and practicability of the proposed control strategy.