Method and device for determining the power output by a photovoltaic installation

摘要

A method for improving the usability of photovoltaic installations (PV installations) by taking account of shading information of adjacent PV installations for forecasting the power output by a relevant PV installation is provided. In particular, cloud movements and cloud shapes are taken into account. This improves the accuracy of the forecast. Here, it is advantageous that short-term forecasts in relation to e.g. the next 15 minutes are possible and a substitute energy source can be activated accordingly, in good time, prior to a dip in the power output by the PV installation. The invention can be used e.g. in the field of renewable energies, PV installations or smart grids.

主权项

1. A method for determining a power output by a respective one photovoltaic installation of a plurality of photovoltaic installations, the method comprising:
providing to a processor unit associated with the respective one photovoltaic installation shading information by at least one adjacent photovoltaic installation being adjacent to the respective one photovoltaic installation, establishing by the processor unit a temporal and spatial forecast in relation to an imminent shading on the basis of the shading information from the at least one adjacent photovoltaic installation, determining by the processor unit the expected power output by the respective one photovoltaic installation on the basis of the imminent shading in relation to cloud drift, wherein a speed of a shading, in particular of the cloud drift, is established by maximizing a cross-correlation Rab Rab=1T·∫-T/2T/2⁢Pa⁡(t)·Pb⁡(t+τ)⁢⁢ⅆt,⁢withτ=dabvCloud, where a, b denote two photovoltaic installations, T denotes a considered time interval, P denotes a feed-in power, dab denotes a distance between the photovoltaic installations a and b, νCloud denotes an estimated speed of the cloud drift, and activating a substitute energy source depending on the expected power output by the respective one photovoltaic installation.