Fig. 1. Width of focal spot formed by parabolic solar concentrator. (a) Curve distribution; (b) optical path model

Fig. 2. TFFC structure and edge ray principle

Fig. 3. Principle of TFFC surface generation by using CGCM

Fig. 4. Optical efficiency under different models

Fig. 5. Comparison of ray paths between parabolic trough and TFFC. (a) PTC with incident angle of 0; (b) TFFC with incident angle of 0; (c) TFFC with incident inclination of 14 mrad; (d) TFFC with incident angle of 14 mrad and solar cone angle

Fig. 6. Distribution of received energy flow of solar panels under different concentration ratio of photovoltaic geometry. (a) 3.0; (b) 5.0; (c) 7.0

Fig. 7. Concentrating energy flow distribution of solar panel along y=0 section under different CG values

Fig. 8. Concentrating energy flow distribution on solar panels with different photovoltaic ratios. (a) Photovoltaic ratio is 0.1; (b) photovoltaic ratio is 0.2; (c) photovoltaic ratio is 0.4

Fig. 9. Effect of comprehensive error and aperture size for original PTC and TFFC

Fig. 10. Concentration distributions under different comprehensive errors

Fig. 11. Comparison of tracking error angle optical characteristics under different models