摘要：Organic Rankine Cycles(ORCs) are an effective way to produce electricity from low-grade heat sources, which cannot be effectively obtained using conventional high-temperature Rankine cycles. Due to the lack of available information regarding the real Organic Rankine Cycle units on industrial level, off-design simulation under diversified operating conditions plays a significant role for both the system performance prediction and control strategy design. This paper summarizes the theoretical basis, modeling approaches and tools for ORC off-design simulations. Firstly, a review was conducted on the individual state-of-the-art convective heat transfer correlations and void fraction models. Secondly, different kinds of modeling approaches and simulation tools were proposed, highlighting their relevant characteristics, and were categorized for their specific applications. Moreover, an in-depth analysis of technical challenges related to various applications and focusing on the model accuracy and complexity, computational efficiency, as well as the model compatibility were extensively described and discussed. Finally, the current research trends in this field and the development for further investigations were presented.

摘要：基于RSD单次运行,本文研究了其重复频率运行,设计了重频运行系统,针对系统中电容充电速度较慢的问题,首次提出用四倍压电路给电容充电,以提高系统的运行频率。仿真和实验结果均显示,四倍压电路实现了电容快速充电,可在150μs内将3μF电容充电至2.0kV。基于四倍压电路充电,系统运行频率可达500Hz,放电电流达2.2k A(脉宽为9μs),di/dt为497.2A/μs,且器件工作稳定。