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Du J.,Chinese Academy of Agricultural Sciences | Zhang J.,Chinese Academy of Agricultural Sciences | Guo Z.,Inner Mongolia University of Technology | Shi W.,Inner Mongolia Power Group Co.
Nongye Jixie Xuebao/Transactions of the Chinese Society for Agricultural Machinery | Year: 2014

A sun-tracking system was developed in order to improve the collection efficiency of solar air collector and receive more solar energy. Several main tracking modes were briefly introduced. The passive-tracking mode was likely to be perplexed by weather condition and the active-tracking mode could not avoid the cumulative error. A single-axe automatic tracking mode which combined active-tracking mode and passive-tracking mode wais presented. The proposed combined mode overcame the shortcomings of the two modes. Experiments showed that this system works with high precision, good stability and little loss of solar energy. Automatic tracking system could make the collector outlet temperature increased an average of 15℃, so that the collector efficiency was improved. ©, 2014, Chinese Society of Agricultural Machinery. All right reserved. Source

Zhang X.,Nanjing University of Science and Technology | Gao Z.,Inner Mongolia Power Group Co. | Chen Q.,Nanjing University of Science and Technology
Nanjing Li Gong Daxue Xuebao/Journal of Nanjing University of Science and Technology | Year: 2013

For the band-limited networked control systems(NCSs), transmission deadbands with different deadband scheduling policies are set at the sensor and controller respectively. The signal difference-based scheduling policy is adopted at the sensor node, and the system state error-based one is adopted at the controller node. The model of NCSs is established considering the deadband scheduling, the network-induced time delay and the data packet dropout. The design method of controller is given for guaranteing the exponent stability of NCSs. The semi-physical simulative experiments with the real network and the simulative controlled plant are carried out. The experiment results indicate that the network traffic of sensors and controllers is reduced obviously by the proposed approach with the system stabilization. Source

Cai L.,Shanghai JiaoTong University | Xu J.,Shanghai JiaoTong University | Li S.,Shanghai JiaoTong University | Li Z.Y.,Shanghai JiaoTong University | And 6 more authors.
IEEE Transactions on Applied Superconductivity | Year: 2014

Multi-wire conductors consisting of YBCO wires with magnetic substrate are usually applied in the high temperature superconductor (HTS) applications. In these applications, ac loss is a critical factor to determine the capacity of a refrigerator. And the ac losses of YBCO-NiW wires will be affected by the magnetic substrate. In this work, the self-field loss of the YBCO wire with the magnetic substrate is firstly measured, and compared with the numerical data. Moreover, the ac losses of a multi-wire YBCO-NiW conductor consisting of three wires are investigated for three transport modes. The main results show that the measured self-field loss of the wire is identical with the numerical ones. Accordingly, the reliability of the experimental and numerical methods is verified. Also, the ac losses of the conductor are in good agreement with the numerically calculated losses. As for the multi-wire conductor's total losses, the change of the direction of current in wires will not have an apparent influence on the total ac losses. © 2013 IEEE. Source

Zhao G.T.,Inner Mongolia Electrical Power Research Institute | Yang B.F.,Inner Mongolia Electrical Power Research Institute | Zhang H.B.,Inner Mongolia Power Group Co. | Lu H.J.,Inner Mongolia Electrical Power Research Institute
Applied Mechanics and Materials | Year: 2014

Given the characteristics of power distribution grid project including the huge amount of investment, long construction period, long investment payback period and so on, the precision of investment estimate has a tremendous influence on decision making, economic effect and cost control in each stage. By way of introducing the current situation of investment estimate of power distribution grid project, and analyzing the key factors affecting the investment estimate precision including investment decision-making and management, project design plans, risk and the investment estimate preparation, this paper puts forward improvement strategies aiming at influencing factors in order to promote the rapid development of power distribution grid project in Inner Mongolia. © (2014) Trans Tech Publications, Switzerland. Source

Bai Y.,Tianjin University | Fang D.,Tianjin University | Hou Y.,Tianjin University | He X.,China Electric Power Research Institute | Zhu C.,Inner Mongolia Power Group Co.
Dianli Zidonghua Shebei/Electric Power Automation Equipment | Year: 2010

The solutions of real-time online monitoring and control in power network dispatch center for large-scale wind farms are discussed and the structure and functions of the real-time online monitoring and control system are introduced. The integrated communication management terminal installed in wind farm communicates with the local monitoring and control systems via OPC interface to acquire wind farm data and then sends the data through power dispatch data network or green channel to the monitoring and control master system in dispatch center. According to the dispatch instructions, the master system sends the settings of power control and voltage control to the integrated communication management terminal of controlled wind farms to online control the active power of wind farm and bus voltage of step-up substation for the AGC (Automatic Generation Control) and AVC(Automatic Voltage Control) of large-scale wind farms. The introduced system has been operated in the dispatch center of the west Inner Mongolia power grid. Source

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