Check Method of Zero-order Overflow Protection Based on the Primary Simulation Platform of Power Grid

Through the power dispatching automation system of the power system, the power grid flow information and grid parameters of the regional power grid are obtained, and the primary simulation platform of the power grid is established to calculate the equivalent impedance of the bus at the fault point in the small mode. According to the operation mode of the power grid, generate the network diagram of short-circuit current calculation to generate the zero order current of relevant fault points. According to the principle of the fixed calculation, calculate zero-order overflow II segment fixed value and III segment fixed value, and compared the fixed value of the fixed value with the actual protection device. In this paper, the real-time power flow information of the power grid is obtained by the actual dispatching automation system, and by considering the equivalent impedance of the generator and load fluctuation calculation system, the accuracy of the zero-sequence overflow protection check and the operation reliability of the relay protection device are improved.