HARMONIC MITIGATION USING D STATCOM THROUGH A CURRENT CONTROL TECHNIQUE
The harmonic mitigation using shunt active filters are most widely used in industrial and commercial applications. In this paper a Multi-Level Inverter is considered as DSTATCOM to compensate harmonics. The mathematical modeling of the system and design of the controller using synchronous reference frame theory is also presented. The nonlinear load generally known as diode rectifier load and an unbalanced load is simulated with the system using MATLAB/SIMULINK.
D-STATCOM also contributes in an unbalanced voltage sag mitigation, drives the source current to be fundamental frequency sinusoidal and balanced, also capable in achieving reactive power compensation. In addition to this, several topologies like series shunt and hybrid power filters [3] are designed and implemented to meet IEEE 519-1992 guidelines of harmonic standards. The multilevel inverter topologies are provided highest importance in reducing the harmonic components. These multilevel structures are best suited in obtaining high powers and with a simple conversion process using semiconductor switches. This multilevel approach synthesizes the voltage levels of the bridge circuit and attains the waveforms to be sinusoidal and balanced with reduced harmonic content
The mathematical modelling of the control structure to the D-STATCOM, Nonlinear load and the modelling of 5 level Cascaded H Bridge Inverter with Phase shifted PWM technique is presented. It is proved that the CHB based multilevel inverter mitigates the harmonics in the source current at distribution system. The results from the simulation demonstrates the effectiveness of the D-STATCOM in providing balanced sinusoidal source currents, though the load currents are distorted. It is noted that the THD is 2.15% which is well within IEEE 519-1992 standards.
This Article is Researched by G S Mahesh ,Dr. H M Ravi Kumar,K. Hemachandra Reddy, and Published by J4R journal
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