By setting up the unpowered wind pressure wheel at the chimney top, this paper puts forward the model of "wind supercharged solar chimney power plant (WS-SCPP)". Based on the prototype Spanish solar chimney power plant (SCPP), the physical, mathematical models are built, the performance of WS-SCPP and SCPP are compared and the relationship between chimney height increment and supercharging effect is discussed. The results show that: with the help of unpowered wind pressure wheel, the performance of WS-SCPP improves greatly. At the same turbine rotational speed, the shaft power of WS-SCPP is always higher than that of SCPP. When the speed is 100 rpm, the shaft power of SCPP increases from 37.8kw to 57.03kw, with an increase of 50.9%. The net income and NPV of WS-SCPP are always higher than those of SCPP. The lowest electricity selling price is significantly lower than that of SCPP, with a decrease of 20.1%. When the chimney height of SCPP is increased by at least 80 m, the performance is comparable to WS-SCPP. Wind supercharging technology is one of the effective ways to improve the efficiency and commercial application of SCPP. (C) 2020 Elsevier Ltd. All rights reserved.