Harmonic and Reactive Power Compensation in a Grid Connected PV System with Source Side Control Technique

This paper studies the possibilities of decomposition of the current in three-phase, three-wire systems based on the classic p-q theory. Recently, the energy crisis in the world has led to the rise in use of renewable energy sources with the advancement in power electronics technology, the solar photovoltaic energy has been recognized as an important renewable energy resource because it is clean, abundant and pollution free. The efficiency of the photovoltaic system may be increased by using Maximum Power Point Tracker (MPPT). Introduction of intelligent MPPTs in PV systems is very promising. The electric power supplied by a photovoltaic power generation system depends on the solar radiation and temperature. Furthermore, a low cost control unit is developed, based on a single chip to adjust the output voltage of the solar cell array. The two stage grid interactive PV system described in this paper supplies active power as well as provides harmonic and reactive power compensation. This additional feature increases the effective utilization of PV inverter and increases the overall efficiency of the system. According to P-Q theory active filter currents are obtained from the instantaneous active and reactive powers of the nonlinear load. This is achieved by previous calculation of the mains voltages and the nonlinear load currents in a stationary reference frame αβ components. In this work p-q, i di q , modified p-q and synchronous detection methods are investigated for determining the reference compensation currents of shunt APF with respect to balanced, unbalanced and distorted source voltage conditions. KeywordsP-Q theory, maximum power point tracking (MPPT), reactive power compensation, pv module.