Guiyang, China
Guiyang, China

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Zhao L.J.,GuiZhou Power Grid Co. | Huang L.,GuiZhou Power Grid Co.
Journal of Computational and Theoretical Nanoscience | Year: 2016

A set of vertices D ⊆ V of a graph G = (V ,E) is a dominating set if every vertex in V \D has a neighbour in D. The minimum cardinality of a dominating set is the domination number of G. If there exists a family G = {D1,D2........Dk } such that Di ⊆ V is a dominating set for each i and Di ∩Dj =φ for any distinct i and j, then G is a group of disjoint dominating sets D1,D2.........Dk . Let k ≥ 3, whether a graph can be decomposed into k disjoint dominating sets is NP-complete. In this paper, a mathematical programming formulation is applied to decompose the vertices of a graph into k disjoint dominating sets. It is used to study to find disjoint dominating sets of some triangular and toroidal grids. © 2016 American Scientific Publishers All rights reserved.

Liu N.,GuiZhou Power Grid Co. | Wang F.,University of Sichuan
Advances in Intelligent Systems and Computing | Year: 2017

In this paper, we put forward a dynamic strategy based optimization method for power supply bureau of Guizhou Power Grid to solve the order and inventory problem of 10kV bench transformer. Guizhou Power Grid Corp intends to standardize the distribution of 10 kV bench transformer, materials for construction will be sent to the warehouse of the local power supply bureau, and then distributed to the construction site. In order to ensure the construction schedule and reduce the material purchasing and storage costs, local power supply bureau needs to consider the balance of ordering and inventory. In this paper, local power supply bureau’s order and inventory is considered as a finite stage deterministic inventory problem. We established a finite stage deterministic model, then the dynamic strategy is applied to work the model out, lastly, a real word case of Guizhou Power Grid is applied to the model, and the model calculated the ordering policy with the lowest total cost of order and inventory. © Springer Science+Business Media Singapore 2017.

Chen L.,Tsinghua University | Chen Y.,GuiZhou Power Grid Co. | Min Y.,Tsinghua University | Hu W.,Tsinghua University | Zhang K.,GuiZhou Power Grid Co.
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2012

The total energy in a power system is consistent with the oscillation amplitude. The elements producing energy have negative contribution to the oscillation damping and are considered to be the oscillation sources. Both the generators with negative damping torque and the elements with external periodic disturbance can produce oscillation energy. The formula for the energy production of the external disturbance on a generator is derived. According to the energy flow in the power network, the sources of the oscillation energy can be found, and the energy sources are the oscillation sources. Controls at the oscillation sources can suppress the oscillation effectively. Based on the analysis of energy source and energy flow in the power network, a method using oscillation energy flow to locate oscillation source is proposed. It only uses wide area measurements and is suitable for on-line applications. The validity of the method is verified by the simulation results and the analysis results of actual oscillation accidents. © 2012 State Grid Electric Power Research Institute Press.

Han S.,Zhejiang University | Xu Z.,Zhejiang University | Sun B.,GuiZhou Power Grid Co. | He L.-Q.,Guizhou University
International Journal of Electrical Power and Energy Systems | Year: 2010

Utilizing the Hilbert-Huang transform (HHT) analysis techniques, the authors propose a practical method for detection and estimation of interarea oscillations in power systems from a nonlinear and nonstationary perspective. The methodological approach proposed here can analyze local dynamic behaviors and characteristics of nonstationary and nonlinear signals, better reflect the time-varying law of multi modes involved in oscillation process as well as the mutual influences among these modes, and improve the identification ability and processing effect. An initial application to the data acquired through the wide-area measurement system (WAMs) of Guizhou Power Grid in China is presented to verify the ability of estimating the time-varying characteristics inherent to the electromechanical oscillation processes. The preliminary test results prove the potential and feasibility of the proposed method, and suggest that it can be used as one of on-line identification methods in power system. © 2010 Elsevier Ltd. All rights reserved.

A method for obtaining a three-phase power flow of a power distribution network and a device for obtaining a three-phase power flow of a power distribution network are provided. The method comprises steps of: selecting a three-phase power transformer with an ungrounded neutral connection in the power distribution network; correcting a three-phase admittance matrix of the three-phase power transformer; and applying the three-phase admittance matrix to a preset algorithm to obtain a three-phase power flow of the power distribution network.

Wang F.,GuiZhou Power Grid Co. | Zhang C.,GuiZhou Power Grid Co. | He C.,Xuchang KETOP Electrical Apparatus Testing and Research Institute | Chen Z.-G.,GuiZhou Power Grid Co.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2013

In order to improve the communication efficiency and stability of protection relay fault information system (hereinafter referred to as PRFIS), based on the analysis of current situation of PRFIS, this paper puts forward a method of online communication message analysis for PRFIS, via monitoring of communication messages between master station and slave station, analyzing the error of messages, obtaining the reason that causes the error, and raising the way to correct the error. After a period of trial operation, it has been found that the online communication message analysis system can find and analyze some errors of PRFIS, accordingly it improves the communication quality of PRFIS.

Chen Z.,GuiZhou Power Grid Co. | Zhou H.,GuiZhou Power Grid Co. | Shi D.,Huazhong University of Science and Technology | Chen M.,Huazhong University of Science and Technology | Li Y.,Huazhong University of Science and Technology
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2012

A data integrated management system for relay protection setting calculation of interconnected power system is proposed and implemented by the techniques of data merging, data migration and graphics fusion based on research of current problems existing in the calculated parameters exchange. This system is an integrated platform that data is sent from distributed relay protection setting calculation system. It makes the data to be shared more efficiently. © 2012 State Grid Electric Power Research Institute Press.

Qiuyan Z.,GuiZhou Power Grid Co. | Qiang S.,GuiZhou Power Grid Co.
Journal of Optoelectronics and Advanced Materials | Year: 2016

In this paper, the effects of heat loss on the micro motor performance were investigated, and the propellant formulation was screened to meet the requirements of micro motor. For a designed binder, with the increase of nitrocellulose content, the thermal decomposition performance of LS/NC was the best, the thermal decomposition performance of AP/NC was the worst, and 5:5 LS/NC was suitable as a micro solid rocket propellant formulation. Further calculations demonstrated that the highest temperature appeared at the boundary of the combustion chamber, where the thermal stress and deformation were the maximum. The heat loss had great effects on micro-thruster performance, and the thrust of micro-thruster decreased by 21.7%, and specific impulse decreased by 11.8%. The maximum equivalent thermal stress and thermal deformation of single motor wall were 134.2Mp and 305.9nm respectively. The maximum thermal deformation was small and had little effect on the thermal stability, whereas the thermal stress was the main reason for the stability destruction.

Feng Y.,GuiZhou Power Grid Co.
Dianwang Jishu/Power System Technology | Year: 2011

Online static sensitivity analysis is one of the important constituent component in advanced application software for energy management system (EMS). To carry out online static sensitivity analysis in the EMS of dispatching center of China Southern power Grid (CSG), it is needed to make calculation of the full model of 500 kV/220 kV AC/DC hybrid power gird covering five provinces and districts, so it is necessary to consider various physical responses of generators in these provinces and districts and the interaction between AC and DC power networks, in addition, the good covergence of the calculation is to be ensured. To meet above-mentioned demands, the sensitivity algorithm for AC/DC hybrid power grid, in which the characteristics of PV and PQ nodes is taken into account, is adopted. The algorithm that considers quasi-steady physical response characteristics of generators can give sensitivity among AC components and that among AC and DC components. The presented online static sensitivity analysis software has been steadily and efficiently operated in the EMS of dispatching center of CSG more than three years, and operation experiences of this software show that it is practicable for scheduling and control of dispatching center.

Wang J.,GuiZhou Power Grid Co. | Zhou H.,GuiZhou Power Grid Co. | Xiong W.,GuiZhou Power Grid Co. | Niu Z.,GuiZhou Power Grid Co.
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2014

To meet the ever growing demand for the ability to control large-scale power systems, a brand new conceptual model of the next generation system, named operation smart system (OS2), is proposed. The top-level application of OS2 is designed as the power system operation cockpit (POC). The concept and design of POC are described first, and the related technologies of key performance indicator (KPI) system design, panoramic modeling, remote calling of the user interface, and the smart gateway are then discussed in detail. Pilot applications demonstrate the feasibility of the design and technologies. ©2014 State Grid Electric Power Research Institute Press.

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