New control approach for capacitor supported DSTATCOM in three-phase four wire distribution system under non-ideal supply voltage conditions based on synchronous reference frame theory

Abstract A large number of single-phase linear and non-linear loads may be supplied from three phase ac mains with neutral conductor. They cause excessive neutral current, harmonics and reactive power burden and unbalance. A four wire DSTATCOM (distribution static compensator) is used for neutral current compensation along with reactive power compensation, harmonics elimination and load balancing. A novel control approach is proposed for the control of four wire DSTATCOM under non-ideal supply voltage conditions. A four-leg voltage–source converter (VSC) with a dc capacitor is used as a four wire DSTATCOM. The proposed control approach is based on synchronous reference frame (SRF) theory and an indirect current control technique. The switching signals for the voltage–source converter (VSC) of the DSTATCOM are derived from the estimated reference supply currents. The load balancing, harmonics elimination and the neutral current compensation are demonstrated along with unity power factor (UPF) and zero voltage regulation (ZVR) modes of operation. Simulation results based on MATLAB software with its Simulink and power system blockset (PSB) toolboxes are presented to validate the control strategy. The DSTATCOM is able to maintain the self-supported dc bus under various disturbances.

[1]  Shahrokh Saadate,et al.  New control approach for four-wire active power filter based on the use of synchronous reference frame , 2005 .

[2]  Hirofumi Akagi,et al.  Instantaneous power theory and applications to power conditioning , 2007 .

[3]  P. Salmeron,et al.  Compensation in nonsinusoidal, unbalanced three-phase four-wire systems with active power-line conditioner , 2004, IEEE Transactions on Power Delivery.

[4]  P. Salmeron,et al.  Instantaneous and full compensation in three-phase systems , 1998 .

[5]  Ned Mohan,et al.  A four-wire, current-controlled converter provides harmonic neutralization in three-phase, four-wire systems , 1993, Proceedings Eighth Annual Applied Power Electronics Conference and Exposition,.

[6]  Peng Dai,et al.  Simulation Research on a SVPWM Control Algorithm for a Four-Leg Active Power Filter , 2007 .

[7]  H. Fujita,et al.  Voltage Regulation Performance of a Shunt Active Filter Intended for Installation on a Power Distribution System , 2003, 2005 IEEE 36th Power Electronics Specialists Conference.

[8]  Arindam Ghosh,et al.  Power Quality Enhancement Using Custom Power Devices , 2002 .

[9]  Mehmet Uçar,et al.  Control of a 3-phase 4-leg active power filter under non-ideal mains voltage condition , 2008 .

[10]  M. Tavakoli Bina,et al.  Design and installation of a ±250 kVAr D-STATCOM for a distribution substation , 2005 .

[11]  Mauricio Aredes,et al.  Control strategies for series and shunt active filters , 2003, 2003 IEEE Bologna Power Tech Conference Proceedings,.

[12]  P. Salmeron,et al.  Analysis of power losses for instantaneous compensation of three-phase four-wire systems , 2005, IEEE Transactions on Power Electronics.

[13]  Bhim Singh,et al.  Reactive power compensation and load balancing in electric power distribution systems , 1998 .

[14]  E.R. Filho,et al.  Detailed implementation of a current controller with 3D space vectors for four wire active filters , 2003, The Fifth International Conference on Power Electronics and Drive Systems, 2003. PEDS 2003..

[15]  G. Joos,et al.  Dynamic performance of three phase four wire active filters , 1997, Proceedings of APEC 97 - Applied Power Electronics Conference.

[16]  J.C.M. Asquerino,et al.  Strategies of instantaneous compensation for three-phase four-wire circuits , 2002 .

[17]  Venkata Dinavahi,et al.  Real-time digital simulation and experimental verification of a D-STATCOM interfaced with a digital controller , 2004 .

[18]  E.R. Cadaval,et al.  Comparison of Control Strategies for Shunt Active Power Filters in Three-Phase Four-Wire Systems , 2007, IEEE Transactions on Power Electronics.

[19]  I. Barbi,et al.  A Control Strategy for Four-Wire Shunt Active Filters Using Instantaneous Active and Reactive Current Method , 2006, IECON 2006 - 32nd Annual Conference on IEEE Industrial Electronics.

[20]  J. L. Reding,et al.  BPA's Probability Based Clearance Buffers, Part I: General Development , 2002, IEEE Power Engineering Review.

[21]  Mauricio Aredes,et al.  Three-phase four-wire shunt active filter control strategies , 1997 .