Control Strategies Based on Symmetrical Components for Grid-Connected Converters Under Voltage Dips

Low-voltage ride-through (LVRT) requirements demand wind-power plants to remain connected to the network in presence of grid-voltage dips. Most dips present positive-, negative-, and zero-sequence components. Hence, regulators based on symmetrical components are well suited to control grid-connected...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2009-06, Vol.56 (6), p.2162-2173
Main Authors: Alepuz, S., Busquets-Monge, S., Bordonau, J., Martinez-Velasco, J.A., Silva, C.A., Pontt, J., Rodriguez, J.
Format: Article
Language:English
Subjects:
Active control
Active filters
Controllers
Converters
Demand
Dipping
Distributed power generation
Electric potential
grid interface
multilevel conversion
Networks
Power conversion
Power generation
Power system stability
Power system transients
Power systems
three-level inverter
Voltage
Voltage control
Voltage fluctuations
Wind energy generation
wind-power system
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Summary:Low-voltage ride-through (LVRT) requirements demand wind-power plants to remain connected to the network in presence of grid-voltage dips. Most dips present positive-, negative-, and zero-sequence components. Hence, regulators based on symmetrical components are well suited to control grid-connected converters. A neutral-point-clamped topology has been considered as an active front end of a distributed power-generation system, following the trend of increasing power and voltage levels in wind-power systems. Three different current controllers based on symmetrical components and linear quadratic regulator have been considered. The performance of each controller is evaluated on LVRT requirement fulfillment, grid-current balancing, maximum grid-current value control, and oscillating power flow. Simulation and experimental results show that all three controllers meet LVRT requirements, although different system performance is found for each control approach. Therefore, controller selection depends on the system constraints and the type of preferred performance features.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2009.2017102