Article

Three-Phase Four-Wire DSTATCOM with Reduced Switches for Power Quality Improvement

Asian Power Electronics Journal 2.

ABSTRACT In this paper, a two-leg VSC (voltage source converter) integrated with a star/hexagon transformer is used for the power quality improvement in three-phase four-wire distribution system. The primary winding of the transformer is star connected and it provides a path to the zero sequence fundamental as well as harmonics neutral currents. The secondary windings of the transformer are connected in hexagon manner and it provides isolation to the two-leg VSC. In order to optimise the voltage rating of the two-leg VSC, the secondary winding of the transformer is suitably designed. The proposed DSTATCOM (Distribution Static Compensator) provides the voltage regulation or power factor correction by reactive power compensation, harmonics elimination, load balancing and neutral current compensation in three-phase four-wire distribution system. This topology has the advantages of the use of 'off the shelf' two-leg VSC, reduced size and cost. The rating of the transformer remains same when it is compensating the neutral current due to unabalance in the load. The performance of the proposed DSTATCOM system is validated through simulations using MATLAB software with its Simulink and Power System Blockset (PSB) toolboxes.

Download full-text

Full-text

Available from: D.P. Kothari, Jun 16, 2015
6 Followers
 · 
378 Views
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Keywords: DSTATCOM, control algorithm, power quality, voltage flicker and dynamic response. Abstract. This paper reviews the performance of detailed and average model for distribution static compensator (DSTATCOM) in order to remove voltage flicker, regulate the voltage at point of common coupling (PCC), power factor correction and harmonics elimination. In these models, d-q theory is used to extract fundamental active and reactive power components of the load currents which will be required to estimate the reference source currents. Both models are evaluated and compared in MATLAB/Simulink based simulation platform.
    nternational Conference on Electrical Power Engineering and Application ICEPEA2014, Langkawi Malaysia; 12/2014
  • [Show abstract] [Hide abstract]
    ABSTRACT: This paper deals with a software phase locked loop (SPLL) based control algorithm for a three phase distribution static compensator (DSTATCOM) for power quality improvement under linear/nonlinear loads in a distribution system. In this control approach, amplitude of fundamental active and reactive power components of load currents is extracted for estimation of reference source currents. The DSTATCOM is modeled in the Matlab environment using Simulink and Sim Power System (SPS) toolboxes. Matlab based developed model of DSTATCOM is used to simulate its performance. Simulated performance of DSTATCOM is found satisfactory under time varying and unbalanced linear and nonlinear consumer loads.
    Power Electronics (IICPE), 2012 IEEE 5th India International Conference on; 01/2012
  • [Show abstract] [Hide abstract]
    ABSTRACT: This paper presents a control algorithm based on enhanced phase-locked loop (EPLL) for distribution static compensator (DSTATCOM) to compensate reactive power, to provide load balancing, to eliminate harmonics, to correct power factor, and to regulate point of common coupling (PCC) voltages under linear and nonlinear loads. In this approach, an extraction of fundamental active and reactive power components of load currents for the estimation of source currents includes a signal-processing algorithm based on the EPLL scheme. The proposed control algorithm is implemented using a digital signal processor. Test results on a developed DSTATCOM are presented to validate the proposed control algorithm for compensation of reactive power, load balancing, harmonics elimination, power factor correction, and zero voltage regulation at PCC.
    IEEE Transactions on Power Delivery 07/2013; 28(3):1516-1524. DOI:10.1109/TPWRD.2013.2257876 · 1.66 Impact Factor