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access icon free Control, implementation, and analysis of a dual two-level photovoltaic inverter based on modified proportional–resonant controller

© The Institution of Engineering and Technology
Received 20/09/2017, Accepted 07/01/2018, Revised 19/12/2017, Published 11/01/2018

This study presents a modified proportional–resonant (M-PR) control topology for single-stage photovoltaic (PV) system, operating both in grid-connected and stand-alone modes. Dual two-level voltage source inverter fed three-phase open-end winding transformer is used to supply the load in this scheme. The M-PR controller is developed for the inner current control loop of the system. The M-PR controller has the ability to track ac current with zero steady-state error. The outer dc-link voltage control loop is developed through the indirect vector control method at synchronously rotating reference frame. The control scheme ensures improved performance of the system at variable solar irradiance and load disturbances. The performance analysis of the dual two-level PV inverter is carried out for different operating conditions. The control scheme is implemented in MATLAB–SIMULINK environment. The theoretical results are verified through experiments in a laboratory prototype. The experimental results show close match with their theoretical counterparts.

Inspec keywords: power transformers; photovoltaic power systems; power generation control; voltage control; electric current control; transformer windings; invertors; power grids

Other keywords: grid-connected mode; dual two-level photovoltaic inverter; indirect vector control method; dual two-level voltage source inverter fed three-phase winding transformer; inner current control loop; modified proportional-resonant control topology; variable solar irradiance; single-stage PV system; MATLAB-SIMULINK environment; M-PR controller; synchronous rotating reference frame; modified proportional-resonant controller; dual two-level voltage source inverter fed open-end winding transformer; M-PR control topology; outer dc-link voltage control loop; load disturbances; single-stage photovoltaic system; stand-alone mode; dual two-level PV inverter

Subjects: Voltage control; Solar power stations and photovoltaic power systems; Transformers and reactors; Control of electric power systems; Current control; DC-AC power convertors (invertors)

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