Grid impedance estimation for grid-tie inverters based on positive sequence estimator and morphological filter
Sign Up to like & getrecommendations! Published in 2020 at "Electrical Engineering"
DOI: 10.1007/s00202-020-00941-8
Abstract: This paper proposes a method for estimating the appropriate grid impedance for applications in which distributed generators are connected to the grid through three-phase inverters. The method is based on variations in active and reactive… read more here.
Keywords: positive sequence; grid impedance; morphological filter;
Autonomous reactive power support for smart photovoltaic inverter based on real-time grid-impedance measurements of a weak grid
Sign Up to like & getrecommendations! Published in 2020 at "Electric Power Systems Research"
DOI: 10.1016/j.epsr.2020.106207
Abstract: Abstract A large share of renewable energy production is connected to a weak grid with significant grid impedance. The transmission impedance causes unintended flow of reactive power to grid, coupling the grid reactive power to… read more here.
Keywords: inverter; power; photovoltaic; reactive power ... See more keywords
A New Approach to H-Infinity Control for Grid-Connected Inverters in Photovoltaic Generation Systems
Sign Up to like & getrecommendations! Published in 2019 at "Electric Power Components and Systems"
DOI: 10.1080/15325008.2019.1689445
Abstract: Abstract The present study investigates the stability problem of the grid-connected inverters (GCIs) for possible variations in grid impedance. A new type of H∞ control method is proposed for the current control loop of inverters,… read more here.
Keywords: systems new; control; connected inverters; grid connected ... See more keywords
Impact of Grid Impedance on LVRT Performance of DFIG System With Rotor Crowbar Technology
Sign Up to like & getrecommendations! Published in 2019 at "IEEE Access"
DOI: 10.1109/access.2019.2938207
Abstract: Nowadays, most of the doubly fed induction generators (DFIGs) are equipped with rotor crowbar for the requirement of low voltage ride through (LVRT). The crowbar resistance is an important parameter, and it is selected taking… read more here.
Keywords: rotor; crowbar; grid impedance; performance dfig ... See more keywords
Dynamic Online Grid Impedance Estimation and Its Effects on DC Capacitor Lifetime in Variable Frequency Drive
Sign Up to like & getrecommendations! Published in 2022 at "IEEE Access"
DOI: 10.1109/access.2022.3197894
Abstract: Grid impedance plays a significant role in the performance and design considerations of nonlinear devices like Variable Frequency Drive (VFD). VFD operates across domestic, industrial, and residential applications under different grid configurations and capacities including… read more here.
Keywords: grid impedance; lifetime; impedance; frequency drive ... See more keywords
Passivity Enhancement of Voltage-Controlled Inverters in Grid-Connected Microgrids Considering Negative Aspects of Control Delay and Grid Impedance Variations
Sign Up to like & getrecommendations! Published in 2021 at "IEEE Journal of Emerging and Selected Topics in Power Electronics"
DOI: 10.1109/jestpe.2021.3065671
Abstract: With growing environmental concerns, the installation of distributed generation systems forming microgrids in power systems has received much attention recently. This panacea, however, has always some challenges with itself. The delay in digital control systems,… read more here.
Keywords: control; impedance variations; grid impedance; delay ... See more keywords
Different Influence of Grid Impedance on Low- and High-Frequency Stability of PV Generators
Sign Up to like & getrecommendations! Published in 2019 at "IEEE Transactions on Industrial Electronics"
DOI: 10.1109/tie.2019.2891459
Abstract: Recently, the stability issues when renewable energy sources are connected to the weak grid have obtained great attention. The popular view thinks that the grid impedance is adverse to the system stability. However, in this… read more here.
Keywords: high frequency; frequency; impedance; different influence ... See more keywords
An Improved PRBS-Injection-Based Grid Impedance Measurement Method Considering Nonideal Grid Conditions
Sign Up to like & getrecommendations! Published in 2023 at "IEEE Transactions on Industrial Electronics"
DOI: 10.1109/tie.2022.3196379
Abstract: The wide-bandwidth grid impedance measurement is a vital way in the resonance and stability analysis of the grid-tied system. However, the grid inevitably suffers from some nonideal conditions, such as voltage unbalance, frequency deviation, harmonics,… read more here.
Keywords: impedance measurement; measurement; grid impedance; measurement method ... See more keywords
H∞ Robust Control of an LCL-Type Grid-Connected Inverter with Large-Scale Grid Impedance Perturbation
Sign Up to like & getrecommendations! Published in 2018 at "Energies"
DOI: 10.3390/en11010057
Abstract: In the distributed power generation system (DPGS), there may be a large range perturbation values of equivalent grid impedance at the point of common coupling (PCC). Perturbation of the impedance will cause resonant frequency variation… read more here.
Keywords: robust control; frequency; perturbation; impedance ... See more keywords