| In recent years,many blackouts at home and abroad have seriously affected the social order and economic development.Through many research,we find that large blackouts are often caused by cascading failures.Meanwhile,the causes and development processes of the cascading failures are complex,and its complexity increases with the scale of the power grid.Therefore,based on the model of cascading failure,the cellular automata model of electric power system based on electrical node is constructed in view of the mechanism and evolution of cascading failure of power grid.And the model is applied to the research of key cell identification,load cutting control measures and voltage stratification control measures.Firstly,cellular automaton model based on electrical node is established by cellular automata theory.Taking the bus of the power grid as the cell,the power and voltage characteristics of the power grid are considered by the cell state.Two kinds cascading failures of overload and voltage protection can be simulated by the model.To make the evolutionary process of the cellular automata accord with the actual transfer process of the power grid,the electrical coupling between nodes is considered by the transformational rules of the cells.Meanwhile,the feasibility of the model is verified based on the IEEE 39 nodes system.Secondly,based on the electrical node cellular automata model,vital node are identified,and the load shedding control measures for vital node are formulated.Finally,according to the level of the voltagel,the electric node cellular automaton model is divided into the high pressure cell layer and the low pressure cell layer.The voltage control of the electric node cellular automata is put into use from the low voltage layer to the high voltage layer.Meanwhile,the voltage of the cells is guaranteed within the allowable range.The effectiveness and feasibility of the voltage control measures are verified by the simulation based on the GS grid. |
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