The direct steam generator (DSG) solar power tower plant concept is receiving more attention due to its ability to provide superheated steam without any intermediate heat exchanger and heat transfer fluid. However, the literature on the time-dependent or quasi-static performance evaluation of these systems is limited. In this study, a thermoeconomic assessment of a DSG solar tower with a dual receiver mechanism integrated with a regenerative steam Rankine cycle is carried out. A quasi-static analysis of the system is provided to study the performance of a DSG solar power tower under different operating conditions, i.e. ambient temperature and solar irradiation. To do so, a flexible operation strategy is developed for the heliostat field at which the number of mirrors directed toward the evaporator and superheater is varied to maximize the output of the DSG system. The developed control strategy provides flexibility and improvement in the system’s performance in off-design conditions. Thermoeconomic analysis showed that a 50 MWe plant LCOE is 127.7 US$/MWh with an annual solar share of 42.3%. The plant LCOE is reduced to 114.6 US$/MWh by increasing the plant capacity to 150 MWe.

直接蒸汽发生器（DSG）太阳能塔式设备的概念由于无需任何中间热交换器和传热流体即可提供过热蒸汽的能力而受到越来越多的关注。但是，有关这些系统的时间相关或准静态性能评估的文献有限。在这项研究中，对具有双接收器机制和再生蒸汽朗肯循环的DSG太阳塔进行了热经济评估。提供了系统的准静态分析，以研究DSG太阳能塔在不同工作条件（即环境温度和太阳辐射）下的性能。为此，针对定日镜领域开发了一种灵活的操作策略，在该策略中，可以改变指向蒸发器和过热器的反射镜的数量，以使DSG系统的输出最大化。所开发的控制策略可在非设计条件下提供灵活性并改善系统性能。热经济分析表明，一个50 MWe的电厂的LCOE为127.7美元/兆瓦时，年太阳能份额为42.3％。通过将工厂产能提高至150 MWe，工厂的LCOE降至114.6美元/兆瓦时。