Synchronization of PV Inverter with Power Grid at Distribution Level with Power Quality Improvement Feature

Electrical Engineering

At present, Power Quality is one of the key elements, which influences the economy of a nation. Due to rising of population utility supplies excess power to meet the increasing demand of the consumers. To maintain the pollution and the global warming within the particular level alternate sources of energy have used which devolops the pollution less environment. To overcome those issues nonconventional energy come into picture. The whole performance of the electrical utility can be improved by the usage of non-conventional energy resources. There are different forms of Renewable Energy Resource (RES) are available. Among them solar energy is mostly used because it is abundantly available in nature. In addition it has lot of advantages such as no air pollution, no fuel cost, noiseless and low maintenance. Integrating solar power to the grid has adverse effect on the power quality in the grid. This paper presents a novel control strategy for achieving maximum benefits from these grid interfacing inverters when installed in 3-phase 4-wire distribution systems. The inverter is controlled to perform as a multi-function device by incorporating active power filter functionality. The inverter can thus be utilized as: 1) power converter to inject power generated from RES to the grid, and 2) shunt APF to compensate current unbalance, load current harmonics, load reactive power demand and load neutral current. All of these functions may be accomplished either individually or simultaneously. With such a control, the combination of grid-interfacing inverter and the 3-phase 4-wire linear/non-linear unbalanced load at point of common coupling appears as balanced linear load to the grid. This new control concept is demonstrated with extensive MATLAB/Simulink.

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