Mitigation of Harmonic Current in Grid-Connected Solar Power System

Abstract

Direct connectivity of solar power with grid contributes an important part in today’s electric power supply system. This will be essential need of coming time also, since solar power accumulated first in battery and then making use of this electricity is a cumbersome process. Power generated by solar cells is a sustainable source of electrical energy, and it has started gaining ground in today’s power generation and distribution market to meet the consumer’s need. A suitable model is required, for investigating the capability of solar cell module in directly connected power grid distribution system. In this paper, efforts are made to make a model of directly connected solar power generation system with the grid and to study its characteristics. An interfacing of supply current and solar system generated current is required, so that, if load is more on solar output, this may be compensated with the supply current, and if load is less on solar plant, the surplus electricity can be diverted and supplied to the main grid. Since, loads connected to the main supply are varying in nature, it may hamper the quality of supply current. To compensate these harmonics, this paper suggests, empirical control approaches. The simulation has been chosen is such a way that grid-connected solar power system sends power which is compensated for harmonics and there is less reactive power, due to uneven load on the grid. A grid-connected, 600 Kilo watt solar power plant, at Central Electronics Limited Sahibabad, has been studied for load generation and compensation. Inverters used are discussed. The PV and current–voltage graphs have been plotted. The simulation for harmonics gives optimum result for its compensation with approximately one power factor.