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Zhengzhou, China

Xiao Q.,Henan Electric Power Company
Applied Mechanics and Materials | Year: 2014

Online power system analysis to electric mode-based on information that will offer a decided in real time the quality of the studies and efficiency of the power system operation precision closely associated with the power system model. Accurate and quick decision based on real-time data analysis needs battle plan deregulation of the power system in all over the world. In addition a significant expansion of electric power system in India in recent times, especially in the 2003 introduction of electricity bill, introduction of open access, electric power market, the appearance of communication through power with complex power system operation and control. Electric power network analysis in real-time data is expected to further improve the critical role of power network operation to repair the proposed law after transmission loss of tariff and share. All this forced the power system real time is accurate, but conditions analysis based on different principles. In order to meet the requirements of all, from the monitoring, commercial, reliability and stability of the Angle, attempt to have been forced to take hybrid network model in natural real-time supervisory control and data acquisition (SCADA) systems work so far a single network model of the integrated. This paper presents a network model for the theory foundation and the same is in the southern area rapidly adapt to load center (SRLDC) Bangalore and utilization of energy management system in India (EMS) real-time systems and tools. It is proved to be how to planning can online network system modeling and analysis of relatively simple in complex operational requirements. The experimental results show that the online power management strategy to adapt to can be a key tool control engineers hand in complex power system operation situations. © (2014) Trans Tech Publications, Switzerland.

Lei Y.,China Electric Power Research Institute | Li J.,China Electric Power Research Institute | Hou B.,Henan Electric Power Company
Dianwang Jishu/Power System Technology | Year: 2011

Based on the up-to-date theory for the construction of smart power communication network home and abroad, the concrete planning, design and implementation of the construction of power distribution and utilization network are researched. Firstly, the related services of smart power distribution and utilization network and the relation among services and demands of service communication are analyzed, and basic service network models corresponding to various types of services are constructed; then in the viewpoint of the development of the network merging multi services, key technical elements related to the construction of communication network merging four kind of services such as available communication technology, structure of communication protocols, technology of synthetical network management and network security technology, are analyzed; finally based on the experiences of actual construction a typical infrastructure based on multi-technological networking, which can support following services: advanced distribution automation, acquisition of power utilization information, video surveillance and environment monitoring, bi-directional information communication between power suppliers and consumers and temporary emergency communication, is put forward, and corresponding typical technical implementation scheme for the construction of such a communication network is given.

Bai H.-K.,Henan Electric Power Company | Li G.-S.,Henan Electrical Power Survey And Design Institute
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2011

The 220 kV electrical network short-circuit current level enhances quickly along with unceasing enhancement of electrical network structure, open-loop operation mode must be carried out gradually to lower the 220 kV electrical network short-circuit current level. But in the process of electrical network open-loop it often contradicts with some planned electrical network projects. This paper describes the fundamental principles as well as the main method of open-loop. Taking Zhengzhou 500 kV/220 kV electromagnetic ring for example, in accordance with its present situation and long-term network planning, open-loop operation is progressively implemented and the rationality of Zhengzhou long-term network plan has been simultaneously verified. This paper puts forward the idea of using the open-loop planning studies to verify the rationality of electrical network planning, which not only unifies the network planning and open-loop planning rationally to guide the development of electrical network, but also avoids unnecessary construction to save investment.

Liu Y.,Henan Electric Power Company
Granular Matter | Year: 2014

A theoretical calculation method for the flow rate of granular matter from an inclined orifice is discussed in this article and for the inclination angles at θ ≤ 90°, a theoretical relation between the flow rate Q and inclination angle θ is derived; and for the inclination angles at θ > 90°, a semi-theoretical relation is established. From the relations, we found that the ratio of the flow rate from a vertical orifice, Q90, to that from a horizontal orifice, Q0, is equal to the sine of the angle of repose θr, i.e., Q90/Q0= sin θ r. The theoretical relations are tested by means of the experimental data and the results indicate that the theoretical calculating values are in good agreement with the experimental data over a wide range of the inclination angles. Therefore, the formula proposed in this article can be used for the theoretical calculation of the flow rate of granular matter from an inclined orifice. The relation Q90/Q0 = sin θr may be used as an alternative approach to obtaining θr: measuring Q90 and Q0, and then calculating θr by using formula θr = arcsin (Q90/Q0). © 2014 Springer-Verlag Berlin Heidelberg.

Wang X.-C.,Henan Electric Power Company | Huang J.-D.,Electrical Technical Center
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2011

The paper presents the shortcoming of process level representative framework modes based on IEC61850-9-2 of smart substation, and provides the scheme of point-to-point analogy acquisition and point-to-point tripping. It introduces solution of SV and GOOSE in the power system design, and states the principle of settling the synchronization problem theoretically. Aiming at preventing measure by double AD of electronic CT proposed in the technology leading principle of smart substation, it discusses bus protection's double AD identifying logic and several double AD solving solutions in protecting CPU. What's more, the paper provides SV maintenance identification scheme, GOOSE maintenance identification scheme and relative interlocking logic. Finally, state-monitoring scheme and SV wave-recording and GOOSE wave-reording scheme are given.

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