Method for identifying parameters of active linear network with given network structure

Abstract

The invention provides a method for identifying parameters of an active linear network with a given network structure. The method for identifying the parameters of the active linear network with the given network structure comprises the steps that sensitivity of all the parameters of the active linear network is analyzed, all the parameters are divided into high-sensitivity parameters and low-sensitivity parameters, all the parameters of the active linear network are identified by adopting a global identification mode, and obtained values of the high-sensitivity parameters in the step are final values; according to the values of the high-sensitivity parameters, network constraints are added to the active linear network, and the low-sensitivity parameters in the active linear network are identified. According to the embodiment, the strategy of identification by steps is adopted, the parameters, especially the parameters with multiple values, of the active linear network can be identified accurately and effectively, the obtained parameters can appropriately reflect the actual situation of a power system and accurately represent the dynamic characteristics of the power system.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a parameter identification method of an active linear network with a known network structure. Background technique [0002] In the field of electric power technology, using power system dynamic equivalent technology to analyze the operating state of power system is a hot research direction at present, and the key point is to establish an accurate and simple dynamic equivalent model. [0003] At present, the coherent equivalence method and mode equivalence method of dynamic equivalence are mostly used for offline analysis, while online dynamic security analysis often requires online dynamic equivalence of external systems. Equivalence model, the model parameters are obtained by identification. The existing dynamic equivalent parameters of the power grid are usually identified based on the voltage and current vectors and active and reactive power collected by the PMU (Prec...

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Problems solved by technology

[0006] However, the current dynamic linear equivalent model of the power grid is relatively simple, and it is difficult to completely consider the influence of the dynamic components of the system, and cannot accurately represent the dynamic characteristics of the power grid. In order to ensure the adaptability and effectiveness of the equivalent, the accuracy of the equivalent model must be improved, but the accuracy The equivalent model inevitably increases the identification parameters, which not only makes the identification method very complicated and the identification efficiency is low, but also affects the stability of the identification process and the accuracy of the results, and it is easy to cause some parameters to have multiple values, further increasing the It is difficult to identify, and when dealing with the problem of multi-valued parameters in the existing systems, it is mainly set to a typical value or imposed a special penalty function to restrict it to a typical value, but it is still impossible to accurately identify the multi-valued parameters

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