Abstract: Under the current "bidding to grid" policy for photovoltaic（PV） projects， projects must reduce their costs and increase their efficiencies， which makes higher requirements on equipment selection. Considering the design for a photovoltaic power station in Northwest China and emerging technologies in the industry， key points to the type selection of in-situ step-up transformers， inverters， cables and other equipment were discussed， and integration plans with different equipment were proposed. Through technical and economic comparisons， especially considering the project cost， a suitable equipment selection solution for large-scale centralized PV power stations was selected. The reasonable solution is of lower cost and reliable operation. Lower construction cost of PV power stations lead to a cheaper on-grid electricity price， which improves the competitiveness of PV industry of China.

Key words: PV power station, bidding to grid, in-situ step-up transformer, inverter, equipment selection key point, project cost, layout of inverter arrays