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Liu Q.,Tsinghua University | Duan Y.,Tsinghua University | Wan X.,CPECC Southwest Electrical Power Design Institute
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2013

A power generation system which used the continuous blowdown waste heat to drive an organic Rankine cycle (ORC) was developed to improve the energy efficiency. The blowdown waste heat was recovered by organic fluid, and then generates power by expansion through a turbine. The analysis model of thermal performance for the system was established. The performance of seven ORC working fluids including R227ea, RC318, R236ea, R245fa, R245ca, R123 and R113 were optimized using the GRG algorithm, and the maximum power output was obtained. The results show that the optimum turbine inlet temperature increases as the critical temperature of the working fluid decreases for the o2 cycle which has saturated vapor entering the turbine. However, the superheating in the o3 cycle reduces the waste heat utilization ratio. Supercritical ORC improves the match of temperature profiles between the heat source and the working fluid, which helps to increase the system power output. But the high operation pressure and heat transfer deterioration due to the large specific heat near the critical point must be considered in the system design. The thermal performance and the power output of R236ea are better than the six other fluids. © 2013 Chinese Society for Electrical Engineering.


Luo B.,CPECC Southwest Electrical Power Design Institute | Liu H.,CPECC Southwest Electrical Power Design Institute | Mei T.,CPECC Southwest Electrical Power Design Institute | Xiao H.,CPECC Southwest Electrical Power Design Institute
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2012

PSD-BPA calculation software is an essential tool for electric power planners. With the rapid development of China's power grid, the advance of smart grid and construction of UHV AC/DC transmission network, the setup of national network architecture has gradually formed. Owing to the single integrated application environment, low degree of intelligence, inefficient result application and other shortages of traditional PSD-BPA software, the efficiency of electric power planning and design is affected. In order to enhance computational tools and improve work efficiency, PSD-BPA based stability calculation of the power flow analysis platform using the R&D results of the online pre-decision system is developed. A platform based on PSD-BPA is developed for grid power flow stability calculation and analysis with such new functions as the advanced power grid analyzing function to off-line platform, friendly man-machine interface, highly efficient power modeling, automatic multi-core parallel calculation, and intelligent auxiliary analysis of decision-making integrated into an organic whole. Wide engineering application shows that the analysis platform is user-friendly, intelligent and efficient with fast calculation and correct and effective decision support. © 2012 State Grid Electric Power Research Institute Press.


Liu Y.,CPECC Southwest Electrical Power Design Institute | Liu Y.,Huazhong University of Science and Technology | Zhang Z.,Huazhong University of Science and Technology | Yin X.,Huazhong University of Science and Technology | And 3 more authors.
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2011

This paper deeply analyzes the voltage adaptive reclosure and the phase adaptive reclosure, and then presents a new adaptive reclosure basing on the characteristics of single phase fault and single phase cross single phase fault in double transmission lines on the same tower. Digital simulation indicates that the new adaptive reclosure can judge the fault properties of single phase fault and single phase cross single phase fault in double transmission lines on the same tower exactly. © 2011 State Grid Electric Power Research Institute Press.

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