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Abstract
Power quality and voltage control are among the most important aspects of the grid-connected power converter operation under faults. Non-sinusoidal current is injected during unbalanced voltage sag and active or/and reactive power includes double frequency content. This paper introduces a novel control strategy to mitigate the double grid frequency oscillations in the active power and dc-link voltage of the two-stage three-phase grid-connected Photovoltaic (PV) inverters during unbalanced faults. With the proposed control method, PV inverter injects sinusoidal currents under unbalanced grid faults. In addition, an efficient and easy-to-implement current limitation method is introduced, which can effectively limit the injected currents to the rated value during faults. In this case, the fault-ride-through operation is ensured and it will not trigger the overcurrent protection. A non-MPPT operation mode is proposed for the dc-dc converter. The mode is enabled under severe faults when the converter cannot handle the maximum PV power. Finally, experimental validation is provided by implementing the method in an experimental setup including a 2-kW PV inverter.
Originalsprog | Engelsk |
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Tidsskrift | I E E E Transactions on Industrial Electronics |
Vol/bind | 64 |
Udgave nummer | 11 |
Sider (fra-til) | 8908-8918 |
Antal sider | 11 |
ISSN | 0278-0046 |
DOI | |
Status | Udgivet - nov. 2017 |
Fingeraftryk
Dyk ned i forskningsemnerne om 'Control Strategy for Three-Phase Grid-Connected PV Inverters Enabling Current Limitation Under Unbalanced Faults'. Sammen danner de et unikt fingeraftryk.Projekter
- 1 Afsluttet
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PV2GRID: A Next-Generation Grid Side Converter with Advanced Control and Power Quality Capabilities
Blaabjerg, F., Yang, Y. & Sangwongwanich, A.
01/01/2015 → 30/09/2017
Projekter: Projekt › Forskning