Energy-based transient stability and oscillation dynamic unified analysis method, device and system

Abstract

The invention discloses an energy-based transient stability and oscillation dynamic unified analysis method, device and system, and the method comprises the steps: carrying out the transient stabilityanalysis of a system, and carrying out the oscillation dynamic analysis of the system. In the transient stability analysis process, an IEEAC method is adopted to carry out detailed analysis on the case conditions belonging to the uncertain classes through a power system transient stability rapid classification method; in the oscillation dynamic analysis process; analyzing oscillation characteristics of the system under different time scales based on energy viewpoints; the method comprises the following steps: firstly, analyzing the macroscopic performance of a system from the change of section energy, judging whether the local characteristics of a system oscillation dynamic process need to be analyzed in any time period according to the macroscopic performance, and finally, carrying out mechanism analysis on a specific time section needing mechanism analysis by adopting a characteristic root technology along a track. A unified analysis method is provided for large and small disturbance stability in power angle stability analysis of the power system from the perspective of energy, and manual isolation of large and small disturbance stability analysis is avoided.

Description

Technical field [0001] The invention belongs to the technical field of power systems and their automation, and specifically relates to a unified analysis method, device and system for transient stability and oscillation dynamics based on energy. Background technique [0002] The power angle stability analysis of the power system is artificially divided into large disturbance stability analysis and small disturbance stability analysis. The former is based on the complete model and the numerical integration method is used for analysis, and the latter is based on the linear model and the equilibrium point root method is used for analysis. [0003] Power system large disturbance stability analysis generally uses numerical integration to obtain system disturbance trajectory, but how to extract stability quantitative information from trajectory has always been a difficult problem. The Extension of Equivalent Area Criteria (EEAC) adopts the complementary group inertia center-relative moti...

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Problems solved by technology

[0006] For a long time, the stability analysis of large and small disturbances has been studied in isolation, artificially breaking the integrity of the theory, making it difficult to analyze the relationship between oscillation stability and synchronous stability due to the lack of effective tools when studying the evolution mechanism of power system dynamic processes

In fact, the object of stability analysis of large and small disturbances is the same high-dimensional non-autonomous nonlinear system. The method of equilibrium point characteristic root analysis only linearizes the system at the equilibrium point under certain conditions. This process will inevitably lose the original Influenced by time-varying nonlinear factors in the system; in addition, there is no strict limit on the size of the disturbance. A system operating near the boundary of the stable domain will face the possibility of instability even if it suffers a very small disturbance, while the system operating at a distance from the stable Systems with distant domain boundaries are likely to continue to operate stably even when subjected to large perturbations

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