Multilevel Statcom Based on PID and Fuzzy Control

To investigate the performance of Multilevel STATCOM based on PID with fuzzy controller under fault conditions. Static Synchronous Compensator is used to inject voltages by regulating DC link voltages in the system which consists of two standard inverters associated in cascaded to obtain five level output. Generally DC link voltages are controlled by PI controller. When there is a fault occurrence in the system, then time response of PI controller will be slow and overshoot problems raised. To rectify this problem, PID with fuzzy controller is proposed. By using PID with fuzzy controller, DC link voltages are synchronized; a dq reference frame theory is used in this system for STATCOM to recompense the harmonics. The proposed controller gives less Total Harmonic Distortion, Response Time, Settling Time and Rise Time.

[1]  K. R. Padiyar.  98/00377 Design of reactive current and voltage controller of static condenser , 1997 .

[2]  B. G. Fernandes,et al.  Asymmetrical DC link voltage balance of a cascaded two level inverter based STATCOM , 2010, TENCON 2010 - 2010 IEEE Region 10 Conference.

[3]  Alex Q. Huang,et al.  Small-Signal Model-Based Control Strategy for Balancing Individual DC Capacitor Voltages in Cascade Multilevel Inverter-Based STATCOM , 2009, IEEE Transactions on Industrial Electronics.

[4]  M. B. Brennen,et al.  Vector analysis and control of advanced static VAr compensators , 1991 .

[5]  Hirofumi Akagi,et al.  A 6.6-kV transformerless STATCOM based on a five-level diode-clamped PWM converter: system design and experimentation of a 200-V, 10-kVA laboratory model , 2005 .

[6]  H. P. Mohammadi,et al.  A Transformerless Medium-Voltage STATCOM Topology Based on Extended Modular Multilevel Converters , 2011, IEEE Transactions on Power Electronics.

[7]  B. Blazic,et al.  Improved D-StatCom control for operation with unbalanced currents and voltages , 2006, IEEE Transactions on Power Delivery.

[8]  A. Shukla,et al.  Hysteresis Current Control Operation of Flying Capacitor Multilevel Inverter and Its Application in Shunt Compensation of Distribution Systems , 2007, IEEE Transactions on Power Delivery.

[9]  Kr Padiyar,et al.  Facts Controllers in Power Transmission and Distribution , 2009 .

[10]  H. Akagi,et al.  Control and Performance of a Transformerless Cascade PWM STATCOM With Star Configuration , 2007, IEEE Transactions on Industry Applications.

[11]  R. H. Lasseter,et al.  A transformer-less static synchronous compensator employing a multi-level inverter , 1997 .

[12]  P. Steimer,et al.  Design comparison and control of medium voltage STATCOM with novel twin converter topology , 2004, 2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551).

[13]  Bhim Singh,et al.  Static synchronous compensators (STATCOM): a review , 2009 .

[14]  K.A. Corzine,et al.  Overdistention operation of cascaded multilevel inverters , 2006, IEEE Transactions on Industry Applications.

[15]  Robert H. Lasseter,et al.  Statcom controls for operation with unbalanced voltages , 1998 .

[16]  Y. Kawabata,et al.  SVG using open-winding transformer and two inverters , 2004, 2004 IEEE 35th Annual Power Electronics Specialists Conference (IEEE Cat. No.04CH37551).

[17]  Snehasish Pal,et al.  Performance Analysis of a Three Level Twelve-pulse VSC based STATCOM under Fault Condition , 2013 .