| Power grid dispatching is one key for power balance of the entire power system.The continuing development for the scale of power network, the expansion of theinterconnection area in power system along with the construction of the smart gridhave put forward new challenges to the power grid dispatching, boosting it towardsstandardization, interaction and intelligentialize constantly. The maintenance schedule,which is directly related to the tangible benefits of the power supply companies andpower consumers, is an important work for achieving intelligent dispatching in powergrid and has great impacts on both reliability and economy of the whole systemoperation. Currently, the optimization researches for maintenance schedule mainlyfocus on the unit and transmission side, whereas the study for the distribution networkremains in its primary stage. The arrangement of domestic maintenance schedule indistribution network still depends heavily on human experiences, with large amount ofcalculation, low computational efficiency and strong subjectivity, which wouldimpose great hidden hazards on power grid operation. Therefore, scientificallydesigning a feasible distribution network maintenance schedule optimization schemeand developing a matched supporting system, will be of important practicalsignificance.The present status for optimization of distribution network maintenance schedulewas expounded, with difficulties and keys in the development process refined andanalyzed. Thereafter on the basis of ascertaining the fundamental business demands,the implementation principles were summarized and the overall design of theframework was given. Later the implementation solutions for the developmenthierarchy, the development language, the design pattern, the several techniquesadopted, etc., were introduced.Based on existing research outcomes for the optimization model upondistribution network maintenance schedule, setting out from the current constructionsituation of distribution network in China, the comprehensive optimization modelconsidering selling electricity loss, power grid loss and line loading rate was built,and corresponding constraints were set according to the practical power grid.Combing with the structure and operation characteristics of regional distributionnetwork, a two-stage heuristic algorithm was established, i.e., the clustering algorithm was utilized in the stage one for dividing the distribution network and positioning theblackout area in order to reduce the analysis objects, with the genetic algorithmemployed in the stage two to analyze and verify the blackout area, so as to select andobtain several feasible load transfer paths and evaluate the power grid operationmodes, aiming at achieving the bi-directional optimization for distribution networkmaintenance schedule in both time and path.In view of the visualization function, TWaver technology was introduced to thedevelopment of this system, with TWaver components re-customized and TWavergraphical interface rendered as business meaning of the power system. A complete setof modeling, management and evaluation structure was formed, and functionsincluding the construction of element grid graphic, the formation of the powertopology and the interaction between TWaver graphics and data were achieved. Basedon the aforementioned basis, the purpose of visualization for grid data andmaintenance information was fulfilled.Through introducing the local grid examples and displaying partial functions, theusability of "Maintenance Schedule and Dispatching Modes Management System of110kV Distribution Network" was certified. The project acceptance of this system hadbeen attained and the intended aim was achieved. The development of the systemprovides a strong technical support for the realization of reliable power supply,contributing a beneficial attempt in the process of the intelligent power griddispatching. |
