Research On Early-warning System Of Coalmine Power Grid Based On Grey Fuzzy Comprehensive Evaluation And Expert System

Electricity is the main power supply of coalmine production, the safe operation of coalmine power grid is one of the most important guarantees to ensure normal production of coalmines. Due to the special environment in coalmines, coalmine power grid lies in a very bad environment, making coalmine power grid faults occurred occasionally, and the fault has a random and accidental occurrence, which brings great impact to normal production of coalmine and safety of equipments and personnel. Therefore, it is necessary to study early warning of coalmine power grid safe operation, in order to find signs of fault before it occurs, and to take necessary precautions to minimize the impact of the fault.First of all, this paper analyses the characteristics and the basic principles of fuzzy comprehensive evaluation,gray comprehensive evaluation and expert system, a method combined fuzzy comprehensive evaluation with gray comprehensive evaluation is proposed, to analysis and judge the coalmine power grid state. Based on analysis of the characteristics of the coalmine power grid and main factors on safe operation of power grid, this paper takes a method combined these two evaluation methods, selects power grid evaluation indicators, sets the impact judgment hierarchical matrix of power grid operation , judges the coalmine power grid state in the future by those index value changes, and uses different colors to indicate different power grid states, gives early warning signals if the state is below a certain level. In view of the different early warning results, taking advantage of expert system in analyses and judgments, this paper establishes the power grid state comprehensive evaluation expert system, uses expert's knowledge to analysis power grid early warning signals to decide the necessary control measures of power grid. Simulation results show this method can accurately determine the possible development trend of power grid, and can give early warning signals on the fault that may occur.Finally, software of coalmine power grid early warning system is designed, the paper uses Visual Basic to make interface, calls expert system knowledge base data, display early warning result and judgments graphically, and it has a friendly interface and displays the image graphically and intuitively.