摘要
The natural gas system and electricity system are coupled tightly by gas turbines in an integrated energy system. The uncertainties of one system will not only threaten its own safe operation but also be likely to have a significant impact on the other. Therefore, it is necessary to study the variation of state variables when random fluctuations emerge in the coupled system. In this paper, a multislack-bus model is proposed to calculate the power and gas flow in the coupled system. A unified probabilistic power and gas flow calculation, in which the cumulant method and Gram–Charlier expansion are applied, is first presented to obtain the distribution of state variables after considering the effects of uncertain factors. When the variation range of random factors is too large, a new method of piecewise linearization is put forward to achieve a better fitting precision of probability distribution. Compared to the Monte Carlo method, the proposed method can reduce computation time greatly while reaching a satisfactory accuracy.The validity of the proposed methods is verified in a coupled system that consists of a 15-node natural gas system and the IEEE case24 power system.
基金
supported by National Key Research and Development Program of China(No.2016YFB0901903)
Key Program of National Natural Science Foundation of China(No.51637008)
State Key Laboratory of Electrical Insulation and Power Equipment in Xi’an Jiaotong University(No.EIPE14106)
作者简介
Yuan HU received B.S.degree in electrical engineering from Xi’an University of Technology,China.He is now a Ph.D.student in the Department of Electrical Engineering at the Xi’an Jiaotong University,China.His research interests include renewable energy modeling,coordinating generation and transmission expansion planning and combined gas and electricity network expansion planning.huyuan23@stu.xjtu.edu.cn;Zhaohong BIE received the B.S.and M.S.degrees from the Electric Power Department of Shandong University,Jinan,China,in 1992 and 1994,respectively,and the Ph.D.degree from Xi’an Jiaotong University,Xi’an,China,in 1998.Currently,she is a professor in the State Key Laboratory of Electrical Insulation and Power Equipment and the School of Electrical Engineering,Xi’an Jiaotong University.Her main interests are power system planning,reliability evaluation,as well as the integration of renewable energy into power systems.zhbie@mail.xjtu.edu.cn;Haoran LIAN received the B.Eng.degree from Xi’an Jiaotong University,Xi’an,China in 2015.Currently,he is a post-graduate in Department of Electrical Engineering at Xi’an Jiaotong University.His major research interest is the probabilistic power flow and the network planning.lianhaoran@stu.xjtu.edu.cn;Baorong ZHOU received the Ph.D.degree and is a senior engineer with the rank of a professor in China South Power Grid.His major research interest is the power system stability analysis and control.He also participates in the power network planning of China South Power Grid.zhoubr@csg.cn
