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.

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    ABSTRACT: This research article presents a novel approach based on an instantaneous active and reactive power component (p-q) theory for generating reference currents for shunt active filter (SHAF). Three-phase reference current waveforms generated by proposed scheme are tracked by the three-phase voltage source converter in a hysteresis band control scheme. The performance of the SHAF using the p-q control strategy has been evaluated under various source conditions. The performance of the proposed control strategy has been evaluated in terms of harmonic mitigation and DC link voltage regulation. In order to maintain DC link voltage constant and to generate the compensating reference currents, we have developed Fuzzy logic controller with different (Trapezoidal, Triangular and Gaussian) fuzzy M.F.s. The proposed SHAF with different fuzzy M.F.s is able to eliminate the uncertainty in the system and SHAF gains outstanding compensation abilities. The detailed simulation results using MATLAB/SIMULINK software are presented to support the feasibility of proposed control strategy. To validate the proposed approach, the system is also implemented on a real time digital simulator and adequate results are reported for its verifications.
    Journal of power electronics 09/2012; 12(5). · 0.75 Impact Factor
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    ABSTRACT: This paper presents an implementation of double-frequency oscillation cancellation (DFOC) technique in phase locked loop less synchronous reference frame theory for control of a distribution static compensator (DSTATCOM). This control algorithm on DSTATCOM is used for improvement of power quality under linear and nonlinear loads. The DFOC technique is used for cancellation of double-frequency component from the load fundamental active and reactive power components of currents which are used for deriving the reference supply currents without time delay. A DSTATCOM is developed, and its performance is tested using a digital signal processor. The performance of DSTATCOM is found satisfactory for different types of loads in transient and steady state conditions. Copyright © 2013 John Wiley & Sons, Ltd.
    International Transactions on Electrical Energy Systems 06/2014; 24(6). · 0.63 Impact Factor
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    IEEE PEDES 2014; 12/2014

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