Comparison of multi-megawatt LVRT testing setups for the certification of wind turbines

Under-voltage ride through (UVRT) tests can be carried out on system test benches, most of them are equipped with a converter based grid simulator. This paper describes the control of the artificial grid impedance at the 4 MW test bench at CWD. Validation measurements with the commercial wind turbine E‑115 E2 show that the virtual impedance specification is sufficient to perform UVRT tests with different grid parameters. Comparative measurements between the voltage divider based FRT Container and the grid simulator with deliberately different grid parameters show a different behavior of the research wind turbine FVA nacelle. Therefore, it is recommended to perform UVRT tests on the test bench with predefined grid parameters.

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“…4 shows the structure of the experimental setup. A detailed description of the test bench setup is given in [9,11].…”

Section: Test Setupmentioning

confidence: 99%

“…3 Positive sequence voltage and tolerances of an UVRT test [2] Fig. 4 Test setup with shunt impedance based UVRT testing equipment and grid simulator [11] which enable to connect the DUT either to the converter based grid simulator of the test bench with 20 kV nominal voltage or to the public grid with 10 kV nominal voltage.…”

Section: Test Setupmentioning

confidence: 99%

Influence of the grid parameters during under voltage ride through (UVRT) testing

Frehn

Grune²,

Röttgers³

et al. 2021

Forsch Ingenieurwes

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“…The set-up adopted is representative of the current standard testbench based certification process for units connected to LV distribution networks [25,28,29,[40][41][42][43]45]. Thus, it can be used to generate different reproducible types of disturbed grid voltages like symmetrical and unbalanced voltage, overvoltage, frequency variations, and harmonic disturbances.…”

Section: Experimental Set-upmentioning

confidence: 99%

Unbalance characteristics of fundamental and harmonic currents of three‐phase electric vehicle battery chargers

Hernández

Langella²,

Caño

et al. 2020

IET Generation Trans & Dist

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Three‐phase electric vehicle (EV) battery chargers are expected to not impact the unbalance of distribution networks; moreover, using active power factor correction topologies they are expected to behave like resistive loads not affecting the system harmonic distortion. In this study, unexpected unbalance characteristics of fundamental and harmonic currents of three‐phase EV battery chargers are analysed by means of experimental tests performed on two EV cars of different technology. In order to quantify unbalance and harmonic distortion, proper comprehensive indices, in part developed in this study with specific reference to currents, are utilised. The unbalanced current absorbed even under ideal voltage balanced supply conditions by one of the two EV tested is shown and quantified constituting a real‐life case study of endogenous unbalance. Then, the influence of voltage unbalance supply conditions on fundamental and harmonic currents is evaluated by means of a proposed testing procedure, obtaining case studies of exogenous unbalance. The experimental results obtained for the two EVs should be extended to a larger set of cars; anyway, they show the need, before moving forward to full grid EV connection, for utilities and for designers to improve the current standard certification process and the control performances of three‐phase battery chargers.

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Selective Virtual Impedance for Overcurrent Limitation in Grid-Forming Inverters Under Asymmetrical Faults

Morales-Munoz,

Freijedo,

Pugliese

et al. 2024

2024 IEEE 15th International Symposium on Power Electronics for Distributed Generation Systems (PEDG)

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Comparison of multi-megawatt LVRT testing setups for the certification of wind turbines

Cited by 4 publications

References 6 publications

Influence of the grid parameters during under voltage ride through (UVRT) testing

Influence of the grid parameters during under voltage ride through (UVRT) testing

Unbalance characteristics of fundamental and harmonic currents of three‐phase electric vehicle battery chargers

Selective Virtual Impedance for Overcurrent Limitation in Grid-Forming Inverters Under Asymmetrical Faults

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