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Table 1 Comparison of Actual versus Modeled Gross Solar Electric Output (SEGS VI 1999 Performance) Month Jan 1,853 Feb 3,080 Mar 4,968 Apr 5,874 May 9,209 Jun 10,291 Jul 9,311 Aug 9,517 Sep 7,218 Oct 5,388 Nov 2,538 Dec 1,798 Total 71,045 All Days Actual Model MWh MWh Removing Excluded Days Removing Boiler Operation Days 1,649 2,950 4,813 6,248 9,264 10,434 9,592 9,762 7,488 5,628 2,500 1,818 72,145 Model / Actual 89.0% 95.8% 96.9% 106.4% 100.6% 101.4% 103.0% 102.6% 103.7% 104.4% 98.5% 101.1% 101.5% No. of Excluded Days 3 0 1 4 3 1 1 0 1 2 1 0 17 Actual MWh 1,781 3,080 4,919 5,499 8,636 10,151 9,137 9,517 6,926 5,055 2,446 1,798 68,945 Model Model / MWh Actual 1,564 87.8% 2,950 95.8% 4,779 97.1% 5,418 98.5% 8,471 98.1% 10,182 100.3% 9,401 102.9% 9,762 102.6% 7,172 103.6% 5,242 103.7% 2,397 98.0% 1,818 101.1% 69,155 100.3% No. of Solation Days 0 0 31 30 30 18 18 9 9 31 30 20 226 Actual MWh 0 0 4,968 5,874 8,827 6,904 6,309 2,987 2,304 5,388 2,538 1,265 47,364 Model MWh 0 0 4,813 6,248 8,869 6,985 6,505 3,080 2,358 5,628 2,500 1,301 48,287 Model / Actual 96.9% 106.4% 100.5% 101.2% 103.1% 103.1% 102.3% 104.4% 98.5% 102.9% 101.9% Off-line parasitic loads were adjusted to match the parasitic loads for the SEGS VI plant. SEGS VI circulates the solar field HTF 24 hours per day to minimize thermal shocks to the trough receiver tubes and HTF pumps. This results in a relatively high off-line parasitic load. Based on this analysis, the trough spreadsheet performance model appears to be an appropriate tool for modeling the performance of parabolic trough power plants. The input parameters can be changed to reflect design changes in plant design. Although the model includes thermal storage, this module has not been validated against a real plant; however, the module appears to be functioning correctly based on the output from the model. Table 2 Comparison of Actual versus Modeled Parasitic Electric Loads (SEGS VI 1999) On-Line Parasitic Loads Off-Line Parasitic Loads 60 50 40 30 20 10 0 Figure 2 Daily modeled and actual on-line parasitic loads Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec No. of Actual Model Days MWh MWh 0 0 0 0 0 0 31 720 632 30 789 795 30 1,168 1,117 18 866 872 18 781 816 9 381 385 9 304 299 31 666 747 30 289 350 20 182 195 Model / Actual 87.8% 100.8% 95.6% 100.7% 104.4% 100.9% 98.4% 112.2% 121.2% 107.2% No. of Actual Model Days MWh MWh 0 0 0 0 0 0 31 264 252 30 247 236 30 208 200 18 109 104 18 115 112 9 57 58 9 61 61 31 225 229 30 266 264 20 187 174 Model / Actual 95.5% 95.4% 96.1% 95.1% 97.5% 101.6% 100.2% 101.9% 99.4% 93.2% Actual Model Total 226 6,146 6,207 Capital Cost Model 101.0% 226 1,739 1,690 97.2% 0 100 200 Gross Solar Output (MWhe) 500 NREL has developed a detailed cost model for parabolic trough solar power plants. The model is a based largely on input from FSI, which supplied the mirrors for all of the Luz plants, and has been actively working to promote parabolic trough plants since Luz’s bankruptcy in 1991 [2]. FSI has developed a detailed cost model based initially on the cost data from the Luz SEGS X project and later updated with more recent vendor quotes [7]. FSI provided cost data to NREL as part of its participation in the 1998 Parabolic Trough Road-Mapping Workshop [8] and updated the solar field costs under contract to 300 400 3 Parasitic Load (MWhe)PDF Image | A Parabolic Trough Solar Power Plant Simulation Model
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