Computing system of large power grid closed loop

The present invention provides a large grid computing loop closing system, comprising: a loop closing flow calculation unit, electromechanical transient calculation unit, serial and parallel computing unit computing unit; the improvement wherein said computing system includes rings electromechanical transient - electromagnetic transient hybrid simulation calculation means; closing the loop flow calculation unit, the electromechanical transient calculation unit and the electromechanical transient - electromagnetic transient hybrid simulation unit arranged side by side; the serial computing unit respectively receive the data loop flow calculation unit and the electromechanical transient calculation of the combined unit; the parallel computing unit receives the electromechanical transient - calculation of electromagnetic transient hybrid simulation computing unit. Large grid computing system rings provided by the invention, according to the needs of large-scale grid computing rings, to achieve a calculation based on the trend, electromechanical transient simulation, hybrid simulation method of comprehensive analysis of current calculation rings.