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Fu H.,Henan Electrical Power Dispatching Center | Ju P.,Hohai University | Sun R.,Henan Electrical Power Dispatching Center | Xie H.,Hohai University
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2010

By comparing the global modeling method of electric loads with the node modeling method, it can be concluded that the parameter accuracy of the global modeling method is a little better than that of the node modeling method, but the computing workload is much greater. Based on a comparison between three different error indices, the results show that they have roughly the same parameter accuracy, while the index of trajectory error squares behaves tolerably well. Then, three kinds of measurement variables are compared. The example shows that the sensitivity decreases with the relative generator angle, tie line power and key bus voltage. It has been found that the greater the sensitivity is, the higher will the accuracy be. ©2010 State Grid Electric Power Research Institute Press.


Guo Y.,Tsinghua University | Wu W.,Tsinghua University | Zhang B.,Tsinghua University | Sun S.,Henan Electrical Power Dispatching Center
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2010

Power flow forecasting is a fundamental function in early warning and security countermeasure system (EWSC) for power grid. The ultra-short term and daily power flow forecasting methods are both presented. The factors affecting robustness and accuracy of the results of these two methods are analyzed. Power flow forecasting software is introduced which has been imbedded in a EWSC system. The recorded results from a provincial power grid are given and the practicality of the proposed method is validated. ©2010 State Grid Electric Power Research Institute Press.


Li B.,State Grid Electric Power Research Institute of China | Fu H.,Henan Electrical Power Dispatching Center | Hu Y.,Henan Electrical Power Dispatching Center | Chen T.,Henan Electrical Power Dispatching Center | And 3 more authors.
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2010

To increase the efficiency of planning the annual operation mode, an automatic computation and report generation system for the annual power grid operation mode is designed and implemented. By developing the database, the unified data platform of the operation mode is realized. Based on dynamic optimal allocation hardware, the multi-user and distributed parallel computation is adopted to do the huge computation of annual operation mode analysis. The functions of automatic computation according to workflow and report generation are performed. The structure, functions and key technologies are described. The application shows that the system can standardize the work of planning and analyze the annual power grid operation mode, thus improving the efficiency of power grid analysis. © 2010 State Grid Electric Power Research Institute Press.


Zhang X.,NARI Group | Sun S.,Henan Electrical Power Dispatching Center | Teng X.,NARI Group | Li D.,Henan Electrical Power Dispatching Center | And 2 more authors.
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2010

By dividing the global area into several control areas, a multi-area based automatic generation control (AGC) multi-objective coordinated control method is presented. The main control area objective is to control the area control error ACE of the global area, while the sub-areas are responsible for maintaining the power flow of tie-lines among areas at scheduled interchange and cooperating with the main area in emergency. The method proposed can realize multi-objective coordinated control conveniently and is beneficial for the safe and high quality operation of the power grid. Actual application in the power grid of Henan Province demonstrates the practicability and validity of the method. © 2010 State Grid Electric Power Research Institute Press.


Dai F.,Wuhan University | Dai F.,Henan Electrical Power Dispatching Center | Cui T.,Wuhan University | Xu J.,Wuhan University | Sun Y.,Wuhan University
Dianli Zidonghua Shebei/Electric Power Automation Equipment | Year: 2011

According to the voltage stability analysis with short circuit capacity, an approach of voltage correction control based on comprehensive sensitivity analysis is proposed to improve the load-bus voltage and voltage stability margins after the great disturbance of power system. Based on the analysis of load-bus voltage and short circuit sensitivity, the comprehensive sensitivities are obtained and ranked to get the priorities of control variables. The bigger ones are then chosen to form the control variable set, which is applied to the improved genetic algorithm. Their variation spaces are shrunken according to the comprehensive sensitivity. With the consideration of voltage level, stability margin, grid loss, etc., the optimal control strategy is achieved. The analysis for a provincial power grid and the simulative verification demonstrate the effectiveness of the proposed approach.


Dai F.,Wuhan University | Dai F.,Henan Electrical Power Dispatching Center | Huang L.,Wuhan University | Xu J.,Wuhan University | Sun Y.-Z.,Wuhan University
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2011

Voltage partitioning and pilot nodes selecting are the basis of secondary voltage control. For Henan power grid, an integrated partition method is proposed based on spectral coefficient averaging algorithm and fuzzy C-means clustering algorithm. An objective function based on controllability and representativeness of load node is adopted to find the pilot node of each voltage control area. The simulation result verifies the validities of the method and provides a theoretical basis for secondary voltage control in Henan power grid.


Song D.-W.,China Electric Power Research Institute | Ma S.-Y.,China Electric Power Research Institute | Li B.-Q.,China Electric Power Research Institute | Zhao X.-T.,China Electric Power Research Institute | And 4 more authors.
Lecture Notes in Electrical Engineering | Year: 2011

With real-time data from WAMS and EMS, the paper proposes a kind of comprehensive dynamic stability prevention and control method including low-frequency vibration monitoring, oscillation source search and dynamic stability control strategy. This method on one hand observes multiple oscillation modes and damping characteristics that may be existing in the power grid on line from EMS and through real-time small signal stability analysis, combining the sensitivity analysis, dynamic stability control aided decision for every kind of mode is generated. On the other hand, data from WAMS and online Prony calculating method are used to fast detect the occurrence of low frequency oscillation. Once it occurs, oscillation propagation way will be tracked by the algorithm based on transient energy function and dynamic hybrid simulation to identify possible initial oscillation point. Oscillation pattern matching calculations start to choose the feasible real-time auxiliary control strategy from the matching small disturbance mode. In ideal condition, initial point position and oscillation inhibit quell measures will be showed which provides online automatic monitoring method for preventing dynamic instability of power grid. The method gets practical application in Henan interconnected power grid. © 2011 Springer-Verlag Berlin Heidelberg.


Fu H.,Henan Electrical Power Dispatching Center | Pan L.,Wuhan University | Lin T.,Wuhan University | Sun J.,Henan Electrical Power Dispatching Center | And 4 more authors.
Dianli Zidonghua Shebei/Electric Power Automation Equipment | Year: 2013

An optimization strategy to coordinate the supplementary damping controller in DC-modulation and the PSS(Power System Stabilizer) of AC/DC system is researched for improving its small signal stability and an improved PGSA(Plant Growth Simulation Algorithm) is proposed to solve it. The search efficiency and convergence rate of the proposed algorithm are enhanced by improving the search step and integrating the cloud model theory into iteration to find new growth points. With the least damping ratio of electromechanical oscillation mode under different operating conditions as the objective, eigenvalue analysis and time-domain simulation are carried out for a modified four-generator two-area system as an example, and results show that the improved PGSA damps low frequency oscillation and enhances system small signal stability effectively.


Chen J.,Zhejiang University | Guo C.-X.,Zhejiang University | Liu B.,Hangzhou Zhiguang Econ Co. | Zhou H.-J.,Zhejiang University | Fan D.,Henan Electrical Power Dispatching Center
Dianwang Jishu/Power System Technology | Year: 2010

In view of the low interactive reusability of common information model (CIM) based data of current electric power dispatching system and the inconsistent coding standard, a CIM based adaptive unified coding system, which includes data layer, model-driven layer and coding layer, is proposed. The purpose of adopting the approach of model-driven is to adapt to the differences among various versions of CIM standard and CIM models belonging to different systems and to implement the unified model. On this basis, by means of analyzing hierarchical relations among power system resources, the coding objects are divided into enumeration type, hierarchical relationship type and topological relation type, then coding rules are defined for different types of objects. Finally, the practical application of the proposed coding system in Henan Provincial power dispatching center is presented.


Fu H.,Henan Electrical Power Dispatching Center | Lin T.,Wuhan University | Sun J.,Henan Electrical Power Dispatching Center | Li J.,Wuhan University | And 3 more authors.
Proceedings - Power Engineering and Automation Conference, PEAM 2012 | Year: 2012

Power System Stabilizer controller (PSS) and Static Var Compensator (SVC) with damping controller can effectively damp power system oscillations. In order to eliminate the adverse effects between controllers caused by improper setting of parameters, coordination control of PSS and SVC is studied in this paper using bacterial colony chemotaxis (BCC) optimization algorithm, to improve dampings of electromechanical oscillation modes. Case study based on Two-Area with Four-Machine System, in both eigenvalue analysis and time domain simulation, confirms that the method is valid, and the simulation result shows that the optimal scheme obtained by method proposed in this paper can effectively damp low frequency oscillation and enhance the system small signal stability. © 2012 IEEE.

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