Method for protecting power grid wide-area relay based on unit output power and load change influence
A load change, relay protection technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of complex backup protection coordination, inability to track changes in the operation mode of the power system, and insufficient sensitivity.
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[0023] The technical solution of the present invention will be further described in detail according to the accompanying drawings.
[0024] figure 1 It is a flow chart of a wide-area relay protection method for a power grid that considers the influence of unit output and load changes in the application of the present invention. In this embodiment, the wide-area backup protection system uses the existing wide-area measurement system of the power grid to simultaneously measure the voltage and current phasors of each substation in the power grid to obtain synchronous data of the power grid.
[0025] The wide-area backup protection system calculates the correlation matrix ζ=YA among the currents of each line in the power grid T (AYA T ) -1 A; where, Y is the grid branch admittance matrix; A is the grid node correlation matrix; A T is the transpose matrix of grid node association matrix A.
[0026] The wide-area backup protection system calculates the correlation matrix λ=YA b...
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