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Sliding Mode Control Based Improved Linear Sinusoidal Tracer Control Algorithm for DSTATCOM

Anu Rache Alexander ,H.Brindha

The development in the field of power electronic equipment, the intensive use of static converters, and the great number of domestic electronic-based applications have deteriorated the quality of the power. These nonlinear loads generate current harmonics that can be asymmetric and can cause voltage drops on the supply network impedance resulting in unbalanced conditions. These effects can be worse in the case where the loads change randomly. Conventional solutions like passive filters for reducing the current harmonic pollution are ineffective since they can eliminate only a particular frequency range and another unit required for eliminating next frequency range and so on. This paper presents a three-phase distribution static compensator (DSTATCOM) using sliding mode control based improved linear sinusoidal tracer (ILST) control algorithm for different functions of DSTATCOM such as reactive power compensation for power factor correction, harmonics elimination, and load balancing under nonlinear loads. This control scheme uses the internal model principle of reference currents for achieving from the source and load current. Thus the effectiveness of the system is very improved. The proposed system is simulated under PI controller and fuzzy controller. This results in the better quality of power at the distribution side. It is important to emphasize that the proposed system gives excellent results compared to the conventional methods. The simulation results using MATLAB/SIMULINK are verified for the proposed DSTATCOM.