Research And Simulation On Grid-connected Photovoltaic System Power Prediction And Control Of Reactive Compensation

The energy sustainable supply has become the most important question which thehumanity faces with the development of global industry, the reduction of nonrenewableenergy resources like coal, oil and natural gas. The advantages of solar energy makes thewhole world focus on its application. All the governments around the world take measureto encourage and support the development of solar industry. As a result, PV generationhas made great strides worldwide.This article describes a PV power generation monitoring and control system andPhotovoltaic power station power prediction. This paper studies the method which is usedto detect the current. The method is based on the three-phase instantaneous reactivepower theory of p-q. And by using the method, the sum is extracted from the nonlinearload current and the reactive power of harmonic current component. Harmonic currentcomponent is used as the new static reactive power generator SVG/APF, the actual outputof the inverter current is used as feedback, and the no beat control method of PWMcontrol of SVG, a new static reactive power generator to photovoltaic grid power toreactive power compensation and harmonic suppression. So that large power grids avoidproviding reactive power to the load, and the harmonious current in the grids has greatlyreduced. Therefore, pollution caused by the current distortion and nonlinear loads on thegrid is reduced. This way also reduce influence caused by the integration of photovoltaicpower plant into the big grid. This paper proves that the establishment of MATLABsimulation model can boost the reactive power compensation to happen quickly andaccurately, and thus verifies the possibility of establishment of the photovoltaic gridsystem.