Balance point-independent power system transient synchronization stability analysis method and system

Abstract

The invention relates to the technical field of power system stability analysis and monitoring, in particular to a balance point-independent power system transient synchronization stability analysis method and system. The balance point-independent power system transient synchronization stability analysis method comprises the following steps: determining a synchronization energy function corresponding to a power system model according to the power system model; determining a synchronous convergence domain according to the synchronous energy function; and based on the synchronous convergence domain, judging the transient synchronization stability of the power system according to the initial value of the power system after the fault. By adopting the scheme, the transient synchronization stability of the power system can be directly judged according to the initial value of the power system after the fault on the premise of not knowing the information of the balance point after the fault, meanwhile, time-consuming simulation calculation can be avoided, and quantitative information such as stability margin can be provided.

Description

technical field [0001] The present application relates to the field of power system stability analysis and monitoring technology, in particular to a method and system for analyzing the stability of power system transient synchronization regardless of the balance point. Background technique [0002] The prior art adopts the following two methods to analyze the transient stability of the power system: [0003] The first method, the time-domain simulation method: calculate the trajectory of the system after the failure by simulation, so as to determine the stability, the obtained result is accurate, and there is no need to know the equilibrium point after the failure, but it often has a large amount of calculation and cannot provide a stability margin other quantitative information; [0004] The second method, direct method: estimate the stability region of the post-fault equilibrium point by constructing Lyapunov function or energy function, and calculate a certain critical f...

AI Technical Summary

Problems solved by technology

However, the post-failure equilibrium point is often difficult to predict in advance

There are at least three difficulties in the following aspects: 1) The dynamics of the system are complex and large-scale; 2) The operating point fluctuations caused by the high proportion of new energy; Converge to which equilibrium point

The above problems lead to severe challenges in the practical application of the direct method "correlated" with the equilibrium point

With the access of a large number of new energy sources and power electronic equipment, the transient stability of the power system is becoming more and more difficult, while the fluctuation of new energy sources and the complexity of system dynamics make it more difficult to predict the equilibrium point after a fault.

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