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Energies 2016, 9(9), 723;

A Unified Current Loop Tuning Approach for Grid-Connected Photovoltaic Inverters

Department of Electrical Engineering, Technical University of Catalonia, Rambla Sant Nebridi 22, Terrassa, Barcelona 08222, Spain
Abengoa Research, Abengoa, Energia Solar 1, Palmas Altas, Seville 41014, Spain
Author to whom correspondence should be addressed.
Academic Editor: João P. S. Catalão
Received: 5 May 2016 / Revised: 23 July 2016 / Accepted: 30 August 2016 / Published: 7 September 2016
(This article belongs to the Special Issue Distributed Renewable Generation)
Full-Text   |   PDF [3490 KB, uploaded 7 September 2016]   |  


High level penetration of renewable energy sources has reshaped modern electrical grids. For the future grid, distributed renewable power generation plants can be integrated in a larger scale. Control of grid-connected converters is required to achieve fast power reference tracking and further to present grid-supporting and fault ride-through performance. Among all of the aspects for converter control, the inner current loop for grid-connected converters characterizes the system performance considerably. This paper proposes a unified current loop tuning approach for grid-connected converters that is generally applicable in different cases. A direct discrete-time domain tuning procedure is used, and particularly, the selection of the phase margin and crossover frequency is analyzed, which acts as the main difference compared with the existing studies. As a general method, the approximation in the modeling of the controller and grid filter is avoided. The effectiveness of the tuning approach is validated in both simulation and experimental results with respect to power reference tracking, frequency and voltage supporting. View Full-Text
Keywords: DC-AC power conversion; photovoltaic (PV); proportional resonant (PR) controller; PV inverter DC-AC power conversion; photovoltaic (PV); proportional resonant (PR) controller; PV inverter

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Zhang, W.; Remon, D.; Cantarellas, A.M.; Rodriguez, P. A Unified Current Loop Tuning Approach for Grid-Connected Photovoltaic Inverters. Energies 2016, 9, 723.

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