New Optimized PWM VSC Control Structures and Strategies Under Unbalanced Voltage Transients

Control structures and strategies have a critical influence on a power electronic converter's behavior during disturbances. Most of the previous works in the field of pulsewidth modulation voltage-source converter (VSC) operation under unbalanced conditions propose dual vector controllers with dc bus voltage optimization strategies, which have been proven to be well adapted for rectifier applications. In this paper, two major contributions are made. On the one hand, a new optimized operation strategy based on exchanged power maximization is proposed for vector control structures, which permits the extension of optimized operation to other VSC applications (e.g., flexible alternating current transmission system and distributed generation interfaces). On the other hand, a scalar control structure is proposed based on resonant controllers, together with three adapted optimized operation strategies, namely: 1) dc bus voltage optimization; 2) power exchange maximization; and 3) a hybrid strategy (an intermediary mode between the other two strategies). Their main advantage is their simplicity and the lack of real-time symmetrical component extraction techniques. This scalar controller and the proposed optimized operation strategies are compared to conventional vector controllers. It is proven through experimental analysis that the proposed scalar controller offers very good performances with simpler structures and bigger flexibility in terms of operation modes.

[1]  Remus Teodorescu,et al.  A New Single-Phase PLL Structure Based on Second Order Generalized Integrator , 2006 .

[2]  M. Liserre,et al.  Independent PQ Control for Distributed Power Generation Systems under Grid Faults , 2006, IECON 2006 - 32nd Annual Conference on IEEE Industrial Electronics.

[3]  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).

[4]  T.A. Lipo,et al.  A control scheme in hybrid synchronous-stationary frame for PWM AC/DC converter under generalized unbalanced operating conditions , 2004, Conference Record of the 2004 IEEE Industry Applications Conference, 2004. 39th IAS Annual Meeting..

[5]  P. Rioual,et al.  Regulation of a PWM rectifier in the unbalanced network state using a generalized model , 1996 .

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

[7]  J. Svensson,et al.  Dynamic performance of vector current controllers for grid-connected VSC under voltage dips , 2005, Fourtieth IAS Annual Meeting. Conference Record of the 2005 Industry Applications Conference, 2005..

[8]  Guan-Chyun Hsieh,et al.  Phase-locked loop techniques. A survey , 1996, IEEE Trans. Ind. Electron..

[9]  Seddik Bacha,et al.  A Single Synchronous Frame Hybrid (SSFH) Multifrequency Controller for Power Active Filters , 2006, IEEE Transactions on Industrial Electronics.

[10]  J. Svensson,et al.  Voltage tolerance testing of three-phase voltage source converters , 2005, IEEE Transactions on Power Delivery.

[11]  Donald Grahame Holmes,et al.  Stationary frame current regulation of PWM inverters with zero steady state error , 1999, 30th Annual IEEE Power Electronics Specialists Conference. Record. (Cat. No.99CH36321).

[12]  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).

[13]  Antti J. Koivo,et al.  Nonlinear predictive control with application to manipulator with flexible forearm , 1999, IEEE Trans. Ind. Electron..

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

[15]  F. Blaabjerg,et al.  Advanced Grid Synchronization System for Power Converters under Unbalanced and Distorted Operating Conditions , 2006, IECON 2006 - 32nd Annual Conference on IEEE Industrial Electronics.

[16]  S.M. Silva,et al.  Performance evaluation of PLL algorithms for single-phase grid-connected systems , 2004, Conference Record of the 2004 IEEE Industry Applications Conference, 2004. 39th IAS Annual Meeting..

[17]  T.A. Lipo,et al.  A nonlinear control of the instantaneous power in dq synchronous frame for PWM AC/DC converter under generalized unbalanced operating conditions , 2002, Conference Record of the 2002 IEEE Industry Applications Conference. 37th IAS Annual Meeting (Cat. No.02CH37344).

[18]  D. Boroyevich,et al.  Decoupled Double Synchronous Reference Frame PLL for Power Converters Control , 2007, IEEE Transactions on Power Electronics.

[19]  S.K. Panda,et al.  Analysis and Control of the Output Instantaneous Power for Three Phase PWM Boost Rectifier Under Unbalanced Supply Voltage Conditions , 2006, IECON 2006 - 32nd Annual Conference on IEEE Industrial Electronics.

[20]  H. Stemmler,et al.  Stationary frame generalized integrators for current control of active power filters with zero steady state error for current harmonics of concern under unbalanced and distorted operation conditions , 2000, Conference Record of the 2000 IEEE Industry Applications Conference. Thirty-Fifth IAS Annual Meeting and World Conference on Industrial Applications of Electrical Energy (Cat. No.00CH37129).

[21]  M.R. Iravani,et al.  A method for synchronization of power electronic converters in polluted and variable-frequency environments , 2004, IEEE Transactions on Power Systems.