Method and system for analyzing resonance stability of power distribution network

Abstract

The invention discloses a power distribution network resonance stability analysis method and system, and the method comprises the steps: obtaining an equivalent circuit of a power distribution network, obtaining a node admittance matrix of the power distribution network based on the equivalent circuit, carrying out the partitioning of the node admittance matrix, solving a transfer function matrix, solving the dominant frequencies of the transfer function matrix and damping factors under the dominant frequencies, the stability of the power distribution network is judged according to the positive and negative of the damping factor, the stability of the power distribution network is analyzed and judged through the damping factor, the problem of division of a source subsystem and a load subsystem in the prior art is avoided, meanwhile, high calculation power load caused by traversing a Nyquist curve according to frequency is avoided, analysis time consumption is reduced, and analysis efficiency is improved. And the method has wide applicability to a multi-node complex power distribution network, especially a looped network.

Description

technical field [0001] The invention belongs to the technical field of multi-terminal DC power distribution, and in particular relates to a method and system for analyzing the resonance stability of a distribution network. Background technique [0002] As an important carrier for the integration and consumption of renewable energy, the efficient access of electric vehicles, the transformation and expansion of the AC distribution network, and the integrated energy system, DC power distribution has become one of the development directions of the future power grid and even the energy Internet. With the improvement of the capacity and power level and the increase of the number of power electronic devices, the system exhibits the characteristics of low DC side inertia, many nonlinear loads, and strong system coupling, and the problems of oscillation and even instability become prominent. As an important means of verifying the normal operation of the system, the stability judgment...

AI Technical Summary

Problems solved by technology

However, with the increase of power distribution nodes and the complexity of the network, the traditional impedance ratio criterion based on the division of source-charge subsystems has gradually encountered problems such as difficult division of source-charge subsystem sections and complicated calculation of right half-plane poles. and there is a risk that the criterion will fail

[0004] Therefore, aiming at the multi-node complex DC power distribution system with high power electronics, it is hoped to have a stability judgment method with wider application range, stronger engineering practicability, and higher analysis efficiency, so as to solve the difficulty of section division of the source-load subsystem and the Problems such as complex calculation of the right half plane provide tool support for system oscillation risk assessment and oscillation suppression, thereby ensuring safe and stable operation of the system

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