A Method for Determining Disconnection Sequence of Suppressing Short-circuit Current in Power Grid Considering Safety and Sensitivity

Abstract

The invention discloses a line breakage sequence determination method considering safety and sensitivity for preventing a short-circuit current of a power grid. By the line breakage sequence determination method, the problems that an existing open circuit does not consider a power grid safety factor to easily cause that other circuits in a near zone are severely loaded and the voltage stability margin is reduced are solved. A line breakage sequencing strategy fully considering sensitivity and power grid safety for preventing the short-circuit current of the power grid is made by normalizing short-circuit current sensitivity of an interruptible circuit and sensitivity of power flow change quantity and introducing overheating stability limit of the circuit and a voltage instability risk intorespective penalty functions. With regard to the interruptible circuit with power grid short-circuit current exceeding standard in a near region of a plant station, the influence of factors such as short-circuit current suppression effect, near-zone circuit power flow change quantity, thermal stability limit and power grid voltage stability margin is comprehensively considered, the influence of each factor is quantized, and the interruptible circuit with short-circuit current exceeding standard in the plant station is sequenced according to priority.

Description

technical field [0001] The invention relates to the field of safe and stable operation of a power grid, in particular to a method for suppressing short-circuit current disconnection of a power grid in consideration of safety and sensitivity. Background technique [0002] In recent years, with the rapid development of the power grid, due to the increasingly close connection of the power grid, the problem of excessive short-circuit current in some plants and stations in the power grid has become increasingly prominent, which has seriously threatened the safe and stable operation of the power grid. For the station where the short-circuit current exceeds the standard, an effective method for suppressing the short-circuit current exceeding the standard in the prior art is to disconnect the line. Because the short-circuit current suppression effect of breaking the line near the factory station exceeding the standard is obvious, and no additional new investment is required, it is s...

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Problems solved by technology

[0003] The invention provides a method for determining the disconnection sequence of suppressing the short-circuit current of the power grid in consideration of safety and sensitivity, and solves the problem that the existing disconnection line does not consider the safety factor of the power grid, which is likely to cause severe overload of other lines in the near area and decrease the voltage stability margin question