PV-STATCOM AND TOTAL HARMONIC DISTOTION ANALYSIS

Introduction

Solar energy which is free and abundant in most components of the world has proven to be an economical source of energy in many applications. The sun is an immaculate and renewable energy source, which engenders neither green-house effect gas nor toxic waste through its utilization. Photovoltaic (PV) is a technology in which radiant energy from the sun is converted to direct current (DC) electricity. It utilizes materials which absorb photons of lights and relinquish electrons charges. It can be utilized for making electric engenderers. The rudimental element of these engenderers is denominated a PV cell.

A power electronic interface, e.g., as an inverter, operates in grid-connected mode; the voltage and frequency are tenacious by the utility grid. To maintain the operation power factor unitary the injected current is defined by the power electronic circuit with a felicitous feedback control. With the advent of DG predicated on power electronics, several applications in the last few years have demonstrated the advantages of programming reactive power at the grid, harmonics mitigation, and even voltage control at the Point of Mundane Coupling (PCC), as well as the utilization of energy storage systems.

A voltage source inverter was designed to function in two modes: grid-tied and STATCOM. For it, the voltage source inverter must have two control modes: simple P & Q regulation mode and droop control mode. When the inverter is grid connected, a fast fault detection technique is implemented in order to convert the inverter from into STATCOM and disconnects the DC side voltage support in case of black-out, and to seamlessly reconnect it back to the grid. In droop control mode the grid-connected inverters behaves like STA...

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...rrent is crossing the circumscriptions as compare to the IEC 61000-3-2 Standard and IEEE 519-1992 Standard.

When the PV-STATCOM is connected with electrical load distribution model the Phase-A supply and rms current wave forms distortion due to the presents of harmonic are reduced and are in sinusoidal form as shown in Fig. 18 & 19 respectively. The FFT analysis the supply voltage and current without PV-STATCOM is shown in Fig. 20. Table 4 lists the % of aberrant and even order harmonics present in supply current of the distribution model with PV-STATCOM, obtained after FFT analysis. Table 3 lists the THDs of voltage and current of distribution model due to the nonlinear loads obtained from simulation result. The THD values and the % of harmonics founded in supply current is within the constraints as compare to the IEC 61000-3-2 Standard and IEEE 519-1992 Standard.