On Sep. 29, 2020, Mr. Jianxiang Jin, the president and chief engineer of Supcon Solar announced the yearly electricity generation number of Supcon’s 50 MW solar tower plant in Delingha through China Solar Thermal Alliance.
“From July 26, 2019 to July 25, 2020 ( which is consistent with the Grid company for one year data), the accumulated DNI in Delingha city is 2013.3kWh/m2, the cumulative real power generated was 121.82GWh, comparing the simulated number of 137.482GWh. The fulfillment rate achieved 88.6%. “ Mr. Jin said.
According to Mr. Jianxiang Jin, in fact the electricity generated can be more, which were influenced by several factors: operation experience, grid curtailment and equipment failure.
From August 20 to Sep. 26, 2019, the plant suffered the shutdown and limited load operation at 10MW~40MW, which resulted in a 7 million kWh reduction in power generation.
There’re 10 days in November from 11:00am-3:00pm, with the curtailment to 40% (i.e. 20MW), which resulted in a 0.9million kWh reduction in power generation.
During the period from July 16 to July 25, 2020, the failure of the steam turbine caused about 2.2 million kWh loss in generation.
Apart from these, minor failures occurred in the cold salt pump, solar receiver and SGS system, and the total impact on power generation was close to 756,000 kWh, with an impact rate of 0.55 percentage points. The weather or insufficient operating experience also affect the power generation fulfillment rate by about 3.5%.
If the impact of grid curtailment is excluded, the fulfillment rate should have reached 94.35% (instead of 88.6%) from July 26, 2019 to July 25, 2020, which can fully reflect the actual operating level of the power plant.
Note: green bar means real power generation, blue bar means simulated power generation, unit: 10,000kWh
After more than a year of actual operation, it is found that the measured data of various indicators are better than the design values. For example, the outlet temperature of the molten salt at the receiver reaches 565℃, the highest is 570℃; the solar-thermal conversion efficiency at the design point reaches 56.6% (design value 52.0%); the solar-electric efficiency reaches 24.2 % at the design point (design value 22.0%). Mr. Jin Jianxiang revealed.
According to the previous news by China Solar Thermal Alliance, this plant was connected to the grid on December 30, 2018. After trial operation and problems elimination, it achieved full-load operation for the first time on April 17, 2019. At the same time, it passed the technical acceptance test organized by the China Renewable Energy Engineering Institute. Starting in late July 2019, the power station has entered the regular operation stage.
“The annual operating cost is about CNY 15.45 million yuan, about CNY 0.14 yuan per kilowatt-hour. Among them, personnel expenses account for approximately 64.7% of operating costs. If the scale of the power plant is expanded to more than 100MW, the personnel cost will increase very little, and the operating cost can be controlled within 0.08 yuan/kWh.” Jin Jianxiang added.
Supcon Solar’s 50 MW solar tower plant is one of the first batch of Concentrating Solar Power demonstration projects approved by China National Energy Administration. The remarkable performance has fully verified the advancement and maturity of the large-scale solar tower technology of Supson Solar as well as the Chinese company.
On Nov. 11, 2019, The consortium of Energy China CGGC International Ltd and Supcon Solar signed the EPC contract with NUR-MINOS Heliothermal of 50MW Minos solar tower project in Greek.It will be the first Concentrated Solar Power project with “technology + equipment + engineering” model for Chinese company to enter the international market, which strongly proved that the core technology of solar thermal power generation independently developed by China is feasible, reliable.