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Distance calculation between photovoltaic arrays fixed on sloping ground

The distance calculation between two photovoltaic arrays is important in the design of grid-connected and grid-off power generation. It is easy to calculate the distance between two photovoltaic arrays on horizontal ground, but on the sloping ground existed in practical projects, it is more complicated. This paper introduces a kind of analytical geometry method to solve the problem of distance calculation between two photovoltaic arrays fixed on sloping ground.