An improved method for grid impedance estimation by digital controlled PV inverters suitable for ENS detection
An improved method for grid impedance estimation by digital controlled PV inverters suitable for ENS detection
- Author(s): V. Braca and R. Petrella
- DOI: 10.1049/cp:20080549
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- Author(s): V. Braca and R. Petrella Source: 4th IET International Conference on Power Electronics, Machines and Drives (PEMD 2008), 2008 p. 386 – 390
- Conference: 4th IET International Conference on Power Electronics, Machines and Drives (PEMD 2008)
- DOI: 10.1049/cp:20080549
- ISBN: 978 0 86341 900 3
- Location: York, UK
- Conference date: 2-4 April 2008
- Format: PDF
In this paper an improvement to an existing method for impedance estimation based on inter-harmonic current injection is presented, suitable for ENS detection. This feature is integrated directly in the power converter and shares with this power electronics, sensors and DSP for data processing and control. Realistic simulations using Matlab/Simulink tool are made to verify the effectiveness of the proposed solution within a complete photovoltaic (PV) converter model, including panels, input DC-DC converter and controller running the maximum power point tracking algorithm, DC-AC inverter running dc-link voltage and output current control, LC output filter and accurate grid model. Measurement uncertainty, system non-idealities and specific features (e.g. pulse width modulation and power converter model) have been considered and accurately modelled.
Inspec keywords: digital control; harmonic analysis; DC-DC power convertors; power grids; invertors; electric current control; power generation control; DC-AC power convertors; photovoltaic power systems
Subjects: Control of electric power systems; Power convertors and power supplies to apparatus; Current control; Solar power stations and photovoltaic power systems
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