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 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.

[1]  V. Blasko,et al.  Operation of a phase locked loop system under distorted utility conditions , 1997 .

[2]  Seung-Ki Sul,et al.  Control of unbalanced voltage PWM converter using instantaneous ripple power feedback , 1997, PESC97. Record 28th Annual IEEE Power Electronics Specialists Conference. Formerly Power Conditioning Specialists Conference 1970-71. Power Processing and Electronic Specialists Conference 1972.

[3]  Math Bollen,et al.  Understanding Power Quality Problems: Voltage Sags and Interruptions , 1999 .

[4]  Hong-Seok Song,et al.  Dual current control scheme for PWM converter under unbalanced input voltage conditions , 1999, IEEE Trans. Ind. Electron..

[5]  Chaouki T. Abdallah,et al.  Linear Quadratic Control: An Introduction , 2000 .

[6]  G. Saccomando,et al.  Transient operation of grid-connected voltage source converter under unbalanced voltage conditions , 2001, Conference Record of the 2001 IEEE Industry Applications Conference. 36th IAS Annual Meeting (Cat. No.01CH37248).

[7]  Thomas A. Lipo,et al.  A control method in dq synchronous frame for PWM boost rectifier under generalized unbalanced operating conditions , 2002, 2002 IEEE 33rd Annual IEEE Power Electronics Specialists Conference. Proceedings (Cat. No.02CH37289).

[8]  F.A. Magueed,et al.  Transient performance of voltage source converter under unbalanced voltage dips , 2004, 2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551).

[9]  José R. Espinoza,et al.  PWM regenerative rectifiers: state of the art , 2005, IEEE Transactions on Industrial Electronics.

[10]  F.A. Magueed,et al.  Control of VSC connected to the grid through LCL-filter to achieve balanced currents , 2005, Fourtieth IAS Annual Meeting. Conference Record of the 2005 Industry Applications Conference, 2005..

[11]  I. Erlich,et al.  Grid code requirements concerning connection and operation of wind turbines in Germany , 2005, IEEE Power Engineering Society General Meeting, 2005.

[12]  M. Liserre,et al.  Synchronization methods for three phase distributed power generation systems - An overview and evaluation , 2005, 2005 IEEE 36th Power Electronics Specialists Conference.

[13]  Pablo Lezana,et al.  Resonances in a high-power active-front-end rectifier system , 2005, IEEE Transactions on Industrial Electronics.

[14]  F. Wittwer,et al.  Medium voltage converter for permanent magnet wind power generators up to 5 MW , 2005, 2005 European Conference on Power Electronics and Applications.

[15]  Bueno Peña,et al.  Optimización del comportamiento de un convertidor de tres niveles NPC conectado a la red eléctrica , 2005 .

[16]  M. Chinchilla,et al.  Control of permanent-magnet generators applied to variable-speed wind-energy systems connected to the grid , 2006, IEEE Transactions on Energy Conversion.

[17]  Leopoldo García Franquelo,et al.  Modeling Strategy for Back-to-Back Three-Level Converters Applied to High-Power Wind Turbines , 2006, IEEE Transactions on Industrial Electronics.

[18]  Sergio Busquets Monge.  A novel pulsewidth modulation for the comprehensive neutral-point voltage control in the three-level three-phase neutral-point-clamped dc-ac converte , 2006 .

[19]  Frede Blaabjerg,et al.  Overview of Control and Grid Synchronization for Distributed Power Generation Systems , 2006, IEEE Transactions on Industrial Electronics.

[20]  Sergio Busquets-Monge,et al.  Interfacing Renewable Energy Sources to the Utility Grid Using a Three-Level Inverter , 2006, IEEE Transactions on Industrial Electronics.

[21]  I. Erlich,et al.  Advanced grid requirements for the integration of wind turbines into the German transmission system , 2006, 2006 IEEE Power Engineering Society General Meeting.

[22]  Mauricio Aredes,et al.  Analysis and Software Implementation of a Robust Synchronizing PLL Circuit Based on the pq Theory , 2006, IEEE Transactions on Industrial Electronics.

[23]  Jan T. Bialasiewicz,et al.  Power-Electronic Systems for the Grid Integration of Renewable Energy Sources: A Survey , 2006, IEEE Transactions on Industrial Electronics.

[24]  F. Blaabjerg,et al.  Voltage Sags Ride-Through of Motion Sensorless Controlled PMSG for Wind Turbines , 2007, 2007 IEEE Industry Applications Annual Meeting.

[25]  J. F. Conroy,et al.  Low-voltage ride-through of a full converter wind turbine with permanent magnet generator , 2007 .

[26]  J. Bordonau,et al.  Fast on-line symmetrical components separation method for synchronization and control purposes in three phase distributed power generation systems. , 2007, 2007 European Conference on Power Electronics and Applications.

[27]  Sandra McLain.  IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS , 2007 .

[28]  Frede Blaabjerg,et al.  Flexible Active Power Control of Distributed Power Generation Systems During Grid Faults , 2007, IEEE Transactions on Industrial Electronics.