Research Of The Aspheric Concentrating Solar Power System

In this paper,we design a solar concentrating mirror which adopts partial axis linear focusing. Its reflective surface face type is decided by a series of even-aspheric equations with a specific coefficient a₂,a₄,a₆,a₈,C .Using the high-order cylinder surface with this specific coefficient as the reflective mirror, the light reduction ratio can reach 635:1.Firstly, according to the surface equation and light reflection law of the high-order cylindrical solar concentrating mirror, we can deduce the relation between the vectors of reflected beam and incident beam on the high-order cylinder's inside wall and the configuration parameter a₂,a₄,a₆,a₈,C of the high-order cylinder. Therefore, we can get the evaluation function expression of the concentrating efficiency which theoretical analyses the function relationship between aspheric coefficient and system evaluation function.Secondly, we use the particle swarm optimization to optimize the design of configuration parameter a₂,a₄,a₆,a₈,C .Using the evaluation function of concentrating system as the fitness function of the particle swarm optimization, we can find the even aspheric coefficient which minimizes the fitness function. From optimizing this parameter,we can focus the incident beam which goes through the reflection of high-order cylinder's inside wall into a narrow line segment that parallels to the segment of cylinder to form the line focus.Finally, we use the computer simulation verification and field simulation experiment to exam the designed results, and then give a reflection effect diagram of the solar beam through the whole high-order cylindrical solar concentrating mirror and an experimental effect diagram of the field simulation. The result shows that the offset axis focus and line focusing can be achieved by using the high - order cylinder with a specific coefficient as a condenser. And the linear spot after focusing on the high-order cylindrical condenser can also be used as a high-temperature light source for high temperature utilization.