IEA PVPS Task 2 Performance Database Example
| Year | 1998 | 1999 | 2000 | ||||||||
| Availability of monitored data | 1.00 | 1.00 | 1.00 | AMD | [ ] | ||||||
| Meteorology | |||||||||||
| Annual
irradiation, in array plane |
1 705 | 1 729 | 1 733 | Hi | [kWh/m²] | ||||||
| System Energies | |||||||||||
| Annual a.c. energy output | 3 442 840 | 3 475 500 | 3 575 700 | EIO | [kWh] | ||||||
| System performance Indices | |||||||||||
| Daily reference yield | 4.67 | 4.74 | 4.73 | Yr | [kWh/kW] | ||||||
| Daily final yield | 3.18 | 3.21 | 3.29 | Yf | [kWh/kW] | ||||||
| Daily
array capture losses |
1.26 | 1.29 | 1.24 | Lc | [kWh/kW] | ||||||
| Daily system losses | 0.23 | 0.24 | 0.20 | Ls | [kWh/kW] | ||||||
| Annual performance ratio | 0.68 | 0.68 | 0.69 | PR | [ ] | ||||||
| Annual array efficiency | 9.9 | 9.8 | 10.0 | hA | [%] | ||||||
| Annual inverter efficiency | 93.1 | 93.1 | 94.1 | hinv | [%] | ||||||
| Annual overall plant efficiency | 9.2 | 9.2 | 9.4 | htot | [%] | ||||||
Serre PV power station is constituted of nine electrically independent modular segments of 330 kW each, assembled on freestanding fixed structures with a 20° tilt angle and a tenth segment installed on a tracking structure rotating on a horizontal axis. Here the performance indices of the first nine segments are analyzed.
The construction of the first nine segments of Serre power station was completed in 1994 and operation started in early 1995. During this year experimental data have shown a plant non-availability of about 33 % due to the time spent to adjust the inverters with respect to frequent disturbances of the medium voltage local grid. In consequence, low annual values of both performance ratio (0.47) and daily final yield (2.18 kWh/kW) were obtained in 1995.
During 1996 to 1999, the distribution of plant non-availability has ranged from 2.5 % to 5.3 %, because of some inverter outages due to filtering system, thyristors and input capacitors failures. In this period the plant showed good annual values of both performance ratio (0.66 - 0.68) and annual final yield (3.1 kWh/kW – 3.3 kWh/kW). Moreover the PV arrays confirmed to be the most reliable components during 1996 - 1999.
During the last years, inverter failures have strongly decreased and in the year 2000 no system outages occurred. For this reason the design values of annual performance ratio (0.7) and annual final yield (3.3 kWh/kW) were confirmed by the experimental values obtained in 2000.
modified on 02/14/05