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Xiao Z.-H.,State Power Economic Research Institute
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2014

High reliability and measurement accuracy are the premises and foundations of the practical use of optical transformer in power systems. Based on the theory of power optic sensor and model structure, the implementation plans for magneto-optical glass type as well as all-fiber type current transformer and electro-optic crystal type as well as all-fiber type voltage transformer are classified and compared, the advantages and disadvantages in the aspects of detection algorithms and manufacturing processes are also pointed out. Finally, the problems associated with the practical use of optical sensing technology and research directions are discussed. Source

Liu Z.,State Grid Corporation of China | Zhang Q.,State Grid Corporation of China | Dong C.,State Grid Corporation of China | Zhang L.,State Grid Corporation of China | Wang Z.,State Power Economic Research Institute
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2014

Since the environment problem caused by fossil fuel consumption is intensified, wind power as the most technically mature clean energy in the world has been developed rapidly. In the last decade, wind power made significant progress in China. At present, accommodation capability of wind power in Northwest, Northeast and North China tends to be saturated. With the planned integration of large-scale photovoltaic power, it is urgent to transmit redundant renewable power to loads of other regions. The main problem of wind power operation was analyzed in this paper. The feasibility of transmitting large-scale renewable power located in Northeast and Northwest to North, East and Central China grid through ultra high voltage direct current (UHVDC) projects was systematically researched. The practical calculation method of matched power capacity and the scheduling production simulation method were presented, based on transmission capacity, typical wind output curves and PV curves. The security and stability calculation process is concluded. The proposed method was proved to be effective by simulating project cases. The study results show that curtailment capacity of wind and PV power will be minimized by optimizing the proportion of wind, PV and thermal power on the basis of power system security and stability. And renewable energy will be developed effectively, which is of obvious significance to optimizing structure of power source, improving air quality and achieving the goal of energy conservation and emission reduction. © 2014 Chinese Society for Electrical Engineering. Source

Zhou J.,State Power Economic Research Institute | Zhou J.,Southwest University for Nationalities | Yin W.,State Power Economic Research Institute
Gaodianya Jishu/High Voltage Engineering | Year: 2014

The weak AC system connection of Tibet Power Grid leads to small capacity and more installed number of reactive power compensation apparatus, which will cause increasing investment, thus we established a simulation model of Qinghai-Tibet ac and dc systems with static var compensator (SVC) by PSACD to calculate voltage fluctuation caused by switching reactive power compensation apparatus of different capacity under different operation modes and in different years, so as to figure out suitable reactive power compensation arrangement. Meanwhile, we determined the reactive power capacity of sub-bank for the near term and the future term by plenty of simulation. It is concluded that, the capacity of sub-bank increases from the original 25 MVA to 45 MVA and the temporary steady-state voltage fluctuation of commutation bus can meet the requirements of reactive power guide, indicating that the strategy improves stability and safety of the project. The actual operation situation proves validity and feasibility of the proposed strategy, which provides a reference for future HVDC project design. Source

Sun K.,State Power Economic Research Institute
Dianwang Jishu/Power System Technology | Year: 2011

Present condition of energy resources in China is analyzed and the prospect of applying UHV half-wavelength AC power transmission in China is discussed. By means of calculating annual cost of unit capacity, the economy of UHV half-wavelength AC power transmission is compared with that of UHVDC power transmission, and the results show that the UHV half-wavelength AC power transmission is more economical than the ±800 and ±1000 kV UHVAC power transmission. The social benefit of the UHV half-wavelength AC power transmission is analyzed, the upper-limit of control cost for UHV half-wavelength AC power transmission is given, and the sensitivity analysis on wiring mode of power plant and transmission capacity is performed. Source

Wang J.,Argonne National Laboratory | Bloyd C.N.,Pacific Northwest National Laboratory | Hu Z.,State Power Economic Research Institute | Tan Z.,North China Electrical Power University
Energy | Year: 2010

The escalating demand for electricity in China has caused an electricity shortage in the past several years. This paper discusses the role of demand response (DR) as an integral component in alleviating the problem and coping with this shortfall. It reviews current experience with DR programs, analyzes China's situation and makes suggestions for DR implementation. Although China's DR programs offer high potential to succeed, they require substantial efforts in resolving such key issues as the programs' funding mechanisms, pricing, and relationship with electricity industry reform. Source

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