Trough and Tower Photothermal Generation Technology Analysis
The design of the solar thermal power station mainly considers the proportion SM of the solar thermal collector field and the rated capacity of the generator and the length of the energy storage time. Increasing the energy storage capacity can reduce the unit cost of electricity, mainly because the increase of heat storage can reduce the loss of heat collection resources. However, the optimization of CSP design must not only consider the economy, but also the value of the energy and capacity provided by the CSP station to the power system. The U.S. National Renewable Energy Laboratory used traditional planning tools to analyze the simulation results of different configurations of trough and tower CSP.
Taken together, trough-type CSP stations with energy storage are more costly than similar tower-based CSP stations. The main reason is that trough-type power plants have a greater change in output during the season, with greater heat loss and lower thermal efficiency. If measured according to the value of solar cooling tower solar power generation and trough solar power generation, the two power generation methods are of comparable value.
The study analyzed different SM and different energy storage capacity. The results show that under the condition that the rated capacity of the power plant is relatively high, the marginal value of the low-SM solar thermal power plant system is the largest, which is mainly due to the fact that the energy storage system can avoid the collected energy waste. However, for different SMs, the change in kWh is 6 to 9 hours, and the value of kWh begins to decrease after 9 hours. The smaller SM thermal power station is more conducive to handling high loads and is suitable for peak loads; the larger SM thermal power station can provide stable output for a longer period of time and is suitable for the base load. A smaller SM has a greater capacity value for a CSP station. Capacity is an important part of the value of solar thermal power plants. If the solar energy resources are reasonably scheduled and forecasted, CSP stations can generate capacity values ​​similar to those of traditional thermal power plants.
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