Photovoltaic Grid System Reactive Power Detection And Compensation Study

With the rapid development of global economy, coal, oil and other energy reserves has less and less, and energy resources is serious. These energy use bring greenhouse effect also increasingly clear and lead to globalclimate getting warmer, the future of human beings face serious environmental crisis.2003 years later, the global economy entered a golden age of prosperity. In five years, the price of crude oil into the 2003 prices of 5 times.Energy costs greatly raised, make the governments actively look for new sources of energy to replace the traditional energy, Solar photovoltaic power generation becamean important choice.The p-q method based on instantaneous reactive power theory is introduced. From the nonlinear load current extract reactive and harmonic current according to this method, and the reactive and harmonic current as the reference current value for photovoltaic grid-connected inverter, and the actual output current value of inverter as the feedback. According to the PWM method of current deadbeat control, the inverter can compensate the reactive and harmonic current of local load, and then the power grid will not provide reactive power for the local load and reduce the harmonic current of power grid. So, the harmonic pollution in electrical power system caused by nonlinear load current waveform distortion is avoided, and the stability of power system is enhanced. At last, the simulation results are given, and the simulation results validate the feasibility of the theory and the rapidity of current deadbeat control.