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Wei L.,South China University of Technology | Guo W.,Guangdong Power Dispatch Center | Wen F.,South China University of Technology | Wen F.,Queensland University of Technology | And 3 more authors.
IEEE Transactions on Power Delivery | Year: 2011

A flood of alarm messages in an automatic digital substation makes the monitoring task a significant challenge for the operators in a remote control center, especially under fault scenarios. An online intelligent alarm-processing system is developed based on the architecture of the digital substation. First, real-time alarms are classified according to the IEC 61850 standard in order to provide synthesized and organized alarms for the alarm-processing procedure in the next step. Then, a new and systematic alarm-processing approach for digital substations is developed. Two modules (i.e., the generation of candidate hypotheses and the truth evaluation for the hypotheses) are included in the developed approach, and these two modules are operating in parallel in online implementation. This approach could not only determine the fault/disturbance cause but also the missing or false alarms as well as the causes of the false alarms. According to actual application requirements, an online intelligent alarm-processing system is developed and applied in the Xingguo substationthe first digital substation in Jiangxi Province, China. Finally, an actual alarm-processing scenario serves to demonstrate the presented alarm-processing method as well as the developed software system. © 2011 IEEE.


Tan W.,Guangdong Power Dispatch Center | Shen C.,Tsinghua University | Liu F.,Tsinghua University | Ni J.,Tsinghua University
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2012

Based on the feasibility of applying trajectory eigenvalues analysis for large disturbances, the paper tries to analyze and predict the transient stability of a power system. Along with the system trajectory after faults being cleared, the Taylor expansion model is established. Then the system is approximated into a large number of linear systems with disturbance quantity. Based on stability theory of linear systems and the characteristics of power system instability, the criterion of power system transient instability is provided. The on-line transient stability prediction algorithm is proposed based on the criterion of losing stability. Case studies of New England system and an actual power grid in China are provided to demonstrate the proposed criterion and algorithm, and the results show that the proposed methods are efficient. ©2012 State Grid Electric Power Research Institute Press.


Wu G.,Guangdong Power Dispatch Center | Wang Y.,State Grid Electric Power Research Institute of China | Yang Y.,Guangdong Power Dispatch Center | Wen B.,Guangdong Power Dispatch Center | Li X.,State Grid Electric Power Research Institute of China
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2012

As the second defense line to guarantee safety and stable operation of a power system, security-stability control system is huge and highly complex. It is very important for the dispatcher and operation administrator to control the operation status of the system correctly and promptly. Based on the actual needs of operation management, this paper puts forward the system function and design of the management station, develops the advanced application for operation management, and proposes technological means and scheme to achieve a "visualized and controllable" system. The system developed has been successfully applied on several power grids. © 2012 State Grid Electric Power Research Institute Press.


Zeng K.,Huazhong University of Science and Technology | Wen J.,Huazhong University of Science and Technology | Cheng S.,Huazhong University of Science and Technology | Lu E.,Guangdong Power Dispatch Center | Wang N.,Guangdong Power Dispatch Center
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2014

There exist a small number of critical lines in power system that play key roles in the process of the power system large-scale cascading failure, therefore, in order to implement control strategy effectively in overload cascading trips and to prevent large-scale blackout, it is significant to identify critical lines in the power system rapidly, especially when the system is in a cascading failure state. According to the characteristic that blackouts usually associate with the large-scale active power flow transferring, the flow transferring index was proposed as vulnerability index. Based on the idea of steady-state security region analysis of the power system, a critical lines assessment model was established and an algorithm was given to identify the critical lines in the process of cascading failure. According to the IEEE 30 standard example system, this paper constructed a simulation process of a cascading failure by using the OPA blackout model, and validated the correctness of the proposed identification method through simulation. © 2014 Chin. Soc. for Elec. Eng.


Tong S.,South China University of Technology | Wen F.,Zhejiang University | Chen L.,South China University of Technology | Chen L.,Guangdong Power Dispatch Center
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2012

There are usually some noises in the historical load data, and the accuracy of load forecasting could then be impacted. Hence, it is necessary to de-noise the noises before the load data are used for load forecasting or power system analysis. Considering both horizontal and vertical continuities of electric loads, a new method for load de-noising is presented based on a two-dimension wavelet threshold de-noising method. First, the load data is transformed into a matrix of gray-scale images by normalization. Next, the images are processed by employing the two-dimension wavelet threshold de-noising method. Finally, the de-noised data are obtained after de-normalization. The feasibility and efficiency of the developed method are demonstrated by the improvement of the load forecasting accuracy of an actual example. © 2012 State Grid Electric Power Research Institute Press.


Zhang Y.-J.,South China University of Technology | Chen C.,South China University of Technology | Li Y.,Guangdong Electric Power Design Institute | Wu G.-B.,Guangdong Power Dispatch Center
Electric Power Systems Research | Year: 2010

This paper presents a novel optimization model of dynamic voltage support planning. It considers the state transition course after great disturbance of large-scale receiving end networks (REN). The risk of contingency can be equivalent to the annual risk loss and it can be reduced by the appropriate dynamic voltage support. The annual risk loss consists of state separating risk costs and transferring risk costs. The objective function of dynamic voltage support planning is to maximize the yearly average profit of the state without and with additional dynamic voltage support for the power system. The model is able to describe all kinds of voltage instability scenarios caused by REN interior faults or interface failures properly. The optimal schemes of dynamic voltage support planning of Guangdong receiving end power grids in 2008 and 2010 are given as instance based upon the proposed model, which shows that the comprehensive allocation schemes are of great security and economical efficiency. © 2010 Elsevier B.V. All rights reserved.


Zhang Y.,South China University of Technology | Lin J.,South China University of Technology | Yang Y.,Guangdong Power Dispatch Center
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2011

With large-scale power grids going highly-capacitive, close-coupled and sophisticated, automatic voltage control (AVC) is getting increasingly difficult as can be seen in control mismatch problems between multi-level dispatch centers in engineering practice. The principal manifestations, causes and harm of multi-level voltage control mismatch in large-scale power grids are summarized. Based on an analysis of the essence and mechanism of multi-level voltage control mismatch in large-scale power grids, a game model is presented to describe the problem of multi-level voltage control mismatch. A case study on Nash equilibrium and cooperative game analysis for AVC is employed to show that it's advisable to explain the mismatch mechanism of voltage control and solve the mismatch problem via game modelling. © 2011 State Grid Electric Power Research Institute Press.


Zhang Y.,South China University of Technology | Zhang H.,South China University of Technology | Yang X.,Guangdong Power Dispatch Center
Dianwang Jishu/Power System Technology | Year: 2012

In allusion to the difficulty of voltage regulation due to excessive compensation capacity of single compensator set and absence of inductive and dynamic reactive compensation in 220 kV substations, a synthetical reactive power compensation scheme for 220 kV substation, which combines discrete compensation with continuous compensation, is proposed. In the proposed scheme, the compensation system is composed of one set of direct static synchronous compensator (STATCOM) and shunt capacitor banks which can be flexibly switched. Firstly, an evaluation model for reactive power compensation and voltage regulation in 220 kV substation and its evaluation index called reactive power overshoot rate are constructed and such an index reflects the contradiction between finite number of reactive power compensator sets and inadvisability of excessive compensation capacity of single compensator set, thus the proposed compensation configuration scheme becomes a fundamental way to improve the accuracy of steady-state voltage control and reduce the overshoot to ensure transient voltage stability at receiving end. Simulation results of a certain regional power network in Guangdong province show that the proposed method is favorable to steady-state voltage stability control of power network and can provide effective dynamic voltage support under emergency condition.


Gong X.,Hubei Engineering University | Dong C.,Guangdong Power Dispatch Center | Liu D.,Hubei Engineering University | Wang B.,Hubei Engineering University | And 2 more authors.
Dianwang Jishu/Power System Technology | Year: 2012

The index and methods to analysis low-frequency oscillation probability stability of large-scale interconnected power grids were proposed and the probabilistic analysis of a certain actual large-scale interconnected power grid was performed. Under the condition that probabilistic distribution of various uncertain factors of power grid were known, based on computation method for small signal stability the probabilities of low-frequency oscillation caused by these uncertain factors were calculated by two-point-estimation. Using risk estimation, the system instability due to low-frequency oscillation that might be caused by multiple disturbances was analyzed, and the cost for the control and the risk of instability due to low-frequency oscillation were given. Through integrated probability analysis, in which small-disturbance model was combined with large-disturbance model, an approach of comparing the risk assumed by power grid company with the value from increasing transmission capability was given, and it might be available for reference to power grid dispatchers during judging and weighing between economy and security of power grid.


Zhang Y.,South China University of Technology | Lin J.,South China University of Technology | Yang Y.,Guangdong Power Dispatch Center
Dianwang Jishu/Power System Technology | Year: 2012

Present research situation of volt/var control and coordination of power system home and abroad is surveyed. The equilibrium state of volt/var control and coordination is summed up and its definition is given; the concepts of uncoordinated/coordinated volt/var control are proposed; the models for equilibrium and coordinated reactive power dispatch (ECRPD) are built and key problems and difficulties in the research on volt/var control and coordination are pointed out. Besides, it is suggested to integerate distributed artificial intelligence approach such as multi-agent system with game theory to analyze and solve ECRPD problem.

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