Inner Mongolia Power Dispatching and Communicating Center

Hohhot, China

Inner Mongolia Power Dispatching and Communicating Center

Hohhot, China
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Kang X.,Xi'an Jiaotong University | Ning R.,Xi'an Jiaotong University | Qi J.,Inner Mongolia Power Dispatching and Communicating Center | Wang D.,Xi'an Jiaotong University | Qi Q.,Xi'an Jiaotong University
Dianli Zidonghua Shebei/Electric Power Automation Equipment | Year: 2014

Since the existing dual-terminal fault location algorithms of high-voltage line with series compensation have to expel the pseudo-root, a fault location algorithm based on dual-terminal electrical variables is proposed. Two fault models are built for faults location at different sides of compensation capacitor. When fault occurs, the parameters of both models are identified, both model parameter errors are calculated to determine at which side of the compensation capacitor the fault locates, and the fault location is accurately confirmed according to the parameters of the corresponding model. Without pseudo-root exclusion, the proposed algorithm locates the fault quickly and accurately. Simulative results with EMTP show that, with the location error less than 0.6%, the proposed algorithm is immune to MOV (Metal Oxide Varistor), system resistance, fault type and fault location.


Wang X.,Inner Mongolia Power Dispatching and Communicating Center | Qi J.,Inner Mongolia Power Dispatching and Communicating Center | Hou Y.,Inner Mongolia Power Dispatching and Communicating Center | Wang Y.,Xi'an Jiaotong University | And 3 more authors.
IEEE Power and Energy Society General Meeting | Year: 2014

Different fault characteristics are shown in the micro grid due to distributed generators (DGs) interfaced with inverters. Overcurrent protection cannot operate correctly in this type of micro-grid. In this paper, we analyze the characteristics of the fault currents which are supplied by photovoltaic (PV) units, permanent magnet synchronous wind generators (PMSG) and power storages. These generators are always seen as typical inverter-interfaced DGs. Besides, the performance of overcurrent protection schemes is studied by taking a typical isolated micro-grid as the example. Due to the limited fault current supplied by DGs and frequency deviation of fault current waveform, the overcurrent relays can not operate correctly. Voltage controlled overcurrent relays work well if the fault is not very serious. Due to its reliability in fault detection, the differential protection is suggested to be used in the micro-grid with inverter-interfaced DGs. Finally, a practical protection configuration scheme is proposed for the micro grid in this paper. Differential relays are suggested to act as primary protection and voltage controlled overcurrent relays act as backup protection in the proposed scheme. Digital simulations are performed to verify the fault analysis results and proposed protection configuration schemes. The proposed protection configuration schemes have been used in an isolated micro grid and work well. © 2014 IEEE.


Hou Y.-H.,Tianjin University | Qi J.,Inner Mongolia Power Dispatching and Communicating Center | Wang X.-H.,Inner Mongolia Power Dispatching and Communicating Center | Wan J.,Inner Mongolia Power Dispatching and Communicating Center | And 2 more authors.
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2010

Through an intensive study of wind-turbine generator-shaft system, the paper deduces a dual-mass dynamic model in per-unit with angle and angular speed of the rotating components as its state variables from system equation in nominal unit, in which the influence of gear case ratio and generator pole pair number is considered, and meanwhile clarifies definitions, units and calculation methods of the model parameters. Next, the existing problems of conventional model for wind turbine generator are discussed by comparison. Thereafter, making use of the new acquired model and taking voltage and frequency property of wind turbine power generator into account, the paper gives an overall analysis on the static and dynamic security characteristics of 2009 Inner Mongolia Grid integrating large-scale wind farms. Moreover, the paper specifies the influence on the grid structure, system voltage, reactive compensation, dynamic stability and transient stability of Inner Mongolia Grid arisen by the access and operation of large-scale wind farm as well as the control requirements to system operating so as to guide the operation controlling and planning of wind farm in Inner Mongolia Grid. © 2010 Chin. Soc. for Elec. Eng.


Lin L.,North China Electrical Power University | Wu C.,North China Electrical Power University | Qi J.,Inner Mongolia Power Dispatching and Communicating Center
Dianwang Jishu/Power System Technology | Year: 2016

Bundled wind/thermal power transmission can not only improve economy but also change transient stability and control method of power system. When urgent generator tripping control is needed, it is hard to ensure stable operation of power system or generatortrippingcost is too high by only tripping conventional thermal generation units. Therefore, it is necessary to properlytake wind power into account. Firstly, selection principles of thermal generation units and wind farms to be tripped were proposed respectively based on their characteristics. Then an algorithm about priority coefficient of generator tripping was put forward. Based on priority coefficient of generator tripping, a coordinated generator tripping strategy of thermal generation unit and wind farm was proposed aiming at recovery stability and reduction of tripped generators. At last, validity of the proposedstrategy was verified based on an actual power grid, and applicabilities of generator tripping strategy based on thermal generation unit tripping, wind farm tripping and coordinated generator tripping strategy were compared. © 2016, Power System Technology Press. All right reserved.


Wang X.,Inner Mongolia Power Dispatching and Communicating Center | Wang X.,North China Electrical Power University | Pan X.,Inner Mongolia Power Dispatching and Communicating Center | Pan X.,North China Electrical Power University | And 8 more authors.
2014 International Conference on Mechatronics, Electronic, Industrial and Control Engineering, MEIC 2014 | Year: 2014

With the increasing of wind generators and the scale of wind farm, it is urgent needed to establish a model which is proper and practical to short circuit current calculation. Firstly, this article analyzed the characteristics different types of wind generators' short-circuit current and put forward different types model of wind generators short-circuit current calculation. Secondly, considering the different types of wind generators and the influence of collecting system, this article established a wind farm short-circuit current calculation model which is suitable for engineering application and based on the simulation requirements of 35kV and above high-voltage power grid. The simulation showed that the short-circuit current results used this model is similar to the results adopted detailed model, proving that using this article's model can meet the engineering need and provide important reference value for power grid planning personnel in the grid short-circuit current calculation and the analysis of the restrictive measures. © 2014. The authors - Published by Atlantis Press.


Wang X.,Inner Mongolia Power Dispatching and Communicating Center | Qi J.,Inner Mongolia Power Dispatching and Communicating Center | Hou Y.,Inner Mongolia Power Dispatching and Communicating Center | Wan J.,Inner Mongolia Power Dispatching and Communicating Center | And 2 more authors.
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2011

First, this paper gives an overall introduction of wind power's developing and operating situation of Inner Mongolia power grid. Next, it is specifically demonstrated that the wind power operating characteristics in the Inner Mongolia power grid and achievements of Inner Mongolia Power Dispatching and Communicating Center in the large-scale wind power's integration. Moreover, the emerging concepts along with the development of new energy are illustrated and discussed. Finally, in order to promote the development of wind power in Inner Mongolia, the paper puts forward the technical problems that need to be solved and further development strategies. ©2011 State Grid Electric Power Research Institute Press.

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