Digital Signal Processing

P. Radika ¹, Subhransu Sekhar Dash ²

Affiliations
1 Department of Electrical and Electronics Engineering, Sathyabama University, Chennai, IN
2 Department of EEE, SRM University, Kattankulathur, Chennai, IN

Abstract

Snubber circuits can be used to protect power semiconductor devices from turn-on and turn-off voltage transients. It is also possible to obtain soft-switching by means of snubbers. There are two kinds of soft-switching snubbers namely active and passive snubbers are used in power converters to reduce the switching loss of the main switching device so as to improve the performance of the system. A soft-recovery DC-DC boost converter that operates in a more reliable and an efficient manner than the conventional converter by employing a passive regenerative snubber is presented. The snubber provides soft-switching at turn-off condition of the main switch. Thus, reduces the turn-off loss of the switch. Also recovering the snubber stored energy into the output side. The operation of the conventional and the proposed circuits are supported by MATLAB/Simulink/PLECS simulations results.

Keywords

Regenerative Snubber, Boost Converter, Passive Snubber, Snubber Capacitor, Soft-Switching, Switching Loss, Zero-Voltage Switching, Turn-Off Snubber.

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D. Rajasekaran ¹, Subhransu Sekhar Dash ²

Affiliations
1 Electrical and Electronics Engineering Department, R.M.D. Engineering College, Kavaraipettai, Chennai, Tamil Nadu, IN
2 Electrical and Electronics Engineering Department, SRM University, Kattankulathur, Chennai, Tamil Nadu, IN

Abstract

Devices such as power electronics converters inject harmonic currents in the AC system and increase overall reactive power demanded by the loads.  Also the number of sensitive loads that require ideal sinusoidal supply voltages for their proper operation has increased.  In order to keep power quality under limits proposed by standards, it is necessary to include some sort of compensation. Traditionally, fixed, mechanical switched reactor/capacitor banks and Static Var Compensator have been used for improving the power quality issue in distribution systems. In recent years, applications of inverter based power quality conditioner have been growing for reactive power compensation in distribution systems, since their response is faster than that of the conventional compensators. Distribution STATCOM (D-STATCOM) is an inverter based power quality conditioner device used to improve the power quality issues in distribution systems.  This paper deals with modeling and simulation of DSTATCOM with Energy Storage System based on the synchronous reference frame method for improving the power quality (mitigation of voltage sag and harmonics compensation) of distribution systems. Simulation of DSTATCOM is carried out using simulink in MATLAB.  Simulation studies demonstrate the effectiveness of the proposed control approaches in the synchronous-rotating d-q reference frame for DSTATCOM to improve power quality issues in Distribution System.

Keywords

DSTATCOM, Voltage Sag, Harmonics Compensation, VSI, SIMULINK, Synchronous Reference Frame (SRF) Theory.

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