Method for solving critical approximate power flow after failure of electric system

Abstract

The invention discloses a method for solving critical approximate power flow after the failure of an electric system. The method comprises the steps of: utilizing the technical condition of original power flow convergence, making full uses of the information of power flow convergence section before failure, unifying all failure types into the node injection calculated by the traditional power flow for correction control, correcting failure linked nodes based on a power flow calculation model after failure and obtaining the solution of critical approximate power flow by sequential interactive approximation. The method can quite easily handle failures such as the disconnection of the electric system and the exiting of node injection equipment and has fast calculation, strong universality and wide application range.

Description

technical field [0001] The present invention relates to a method for solving approximate power flow in the case of a power system fault, and in particular to a method for quickly obtaining a reasonable critical approximate power flow solution for the situation that the power flow calculation does not converge after a serious fault occurs in the simulation calculation of the power system ( Post-failure critical approximate power flow solution method for short), belongs to the technical field of power grid dispatching automation. Background technique [0002] Grid power flow calculation is the basis of power system steady state analysis and simulation calculation. Since the power flow calculation is essentially the solution of a set of nonlinear equations, there is a possibility that the calculation results will not converge due to the ill-conditioned singularity of the Jacobian matrix or the unreasonable initial value of the iteration. [0003] Relevant studies have shown th...

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Problems solved by technology

But the disadvantage is that its objective function is a global deviation objective function, and its "critical approximate power flow solution" will change the power flow constraints of the network, and in some cases will affect the application effect

[0010] 1. Not suitable for branch circuit faults that cause system disconnection

Since the continuous power flow still uses the topology and admittance array before the fault after the branch fault, when the tie line that is the cut set of the two electrical islands fails, the acceleration power and frequency of the electrical island cannot be simulated correctly calculate

[0011] 2. It is not applicable to branch failures that cause node injection equipment to exit, such as load shedding or generator exiting operation, etc.

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