Power grid flow solvability identification and initial value generating method based on continuous power flow

Abstract

The invention discloses a power grid flow solvability identification and initial value generating method based on continuous power flow. A convergent solution is obtained by adopting flat starting Newton method load flow calculation and lowering power grid power levels, and continuous power flow calculation is carried out with the convergent solution as an initial state to obtain ground state load flow calculation initial values approaching to a true value better; if a ground state level is reached, it is showed that the power grid flow is solvable, the voltage amplitude value and the phase angle obtained at the moment serve as the initial values, and Newton method load flow calculation is carried out under the ground state to obtain the convergent solution; if the ground state level is not reached, whether a PV curve reaches a branch point or not is judged, if the PV curve reaches the branch point, it is showed that the power grid flow is insolvable, branch point identification is carried out at the moment, and the weakest node in the power grid is searched to obtain sensitivity information. The power grid flow solvability identification and initial value generating method based on the continuous power flow is suitable for load flow calculation with the initial values not given and needing the flat starting, and can serve as an effective tool for improving the initial values of the load flow calculation of large power grids.

Description

technical field [0001] The invention relates to a power grid power flow solvability identification and initial value generation method based on a continuous power flow, and belongs to the technical field of electric power systems. Background technique [0002] The rapid development of the modern power system has gradually formed a large power grid characterized by large capacity, long distance, and regional interconnection. For heavy-duty power systems, the power flow calculation is prone to non-convergence. [0003] There are two possibilities for the divergence of power flow calculation: one is that the power flow problem itself has a solution, but the algorithm cannot obtain this solution due to reasons such as improper selection of initial values; the other is that the system itself has no power flow solution. Using the ordinary Newtonian power flow technique, it is impossible to distinguish between these two situations, and more importantly, it cannot provide informati...

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Document 3 "Study on Polar Coordinate System Quasi-optimal Multiplier Ill-conditioned Power Flow Solution" (Proceedings of the Chinese Society for Electrical E...

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