Abstract Solar-aided coal-fired power generation is a promising technique to reduce cost and enhance the efficiency of concentrated solar power. Operation optimization is important but has difficulty improving the performance of solar-aided coal-fired power plants, due to the fluctuations in power load and solar energy. Therefore, the operation performance and dynamic characteristics of a solar-aided coal-fired power plant were investigated in this study. A model of the plant including trough collector system and coal-fired plant was developed. A case was studied to demonstrate the model practicability on basis of a 600 MW supercritical coal-fired plant and a trough collector system integrated in parallel with #2 and #3 high pressure heaters of regenerative system. Under different solar irradiances, operation characteristics were analyzed from 100% to 50% loads with varying ratio of feedwater to trough collector system. The solar-to-electricity efficiency under different off-design conditions was obtained. Moreover, the dynamic response characteristics of solar-aided coal-fired power plant were studied with the disturbances of direct normal irradiance and ratio of feedwater to trough collector system. Results showed that the solar-to-electricity efficiency in design condition was 25.80%. The adjustment of the ratio of feedwater to trough collector system could lead to an optimized operation. Furthermore, the dynamic characteristics of trough collector system and solar-aided coal-fired power plant were analyzed. The results are expected to guide the control optimization of solar-aided coal-fired power plant.

中文翻译：

---

太阳能辅助燃煤电厂非设计工况及动态过程性能分析

摘要 太阳能辅助燃煤发电是一种降低成本、提高聚光效率的有前景的技术。由于电力负荷和太阳能的波动，运行优化很重要，但很难提高太阳能辅助燃煤电厂的性能。因此，本研究对太阳能辅助燃煤电厂的运行性能和动态特性进行了研究。开发了包括槽式收集器系统和燃煤电厂的电厂模型。以600 MW超临界燃煤电厂和槽式集热器系统与蓄热系统#2和#3高压加热器并联集成为例，研究了该模型的实用性。在不同的太阳辐照度下，运行特性从 100% 到 50% 的负载进行了分析，给水与槽式收集器系统的比例不同。获得了不同非设计条件下的太阳能发电效率。此外，研究了太阳能辅助燃煤电厂在直接法向辐照度和给水与槽式集热器系统之比扰动下的动态响应特性。结果表明，设计工况的太阳能发电效率为25.80%。调整给水与槽式收集器系统的比例可以优化操作。进一步分析了槽式集热系统和太阳能辅助燃煤电厂的动态特性。研究结果有望指导太阳能辅助燃煤电厂的控制优化。