System partition inertia evaluation method based on homology identification

Abstract

The invention discloses a system partition inertia evaluation method based on homology identification. The method comprises the steps of firstly obtaining the network structure parameters of a system,enabling a system model to be linearized under the condition of steady-state operation, and obtaining a system state matrix; obtaining a relative correlation gain matrix according to the obtained system state matrix, performing clustering analysis on the relative correlation gain matrix, and performing homology identification on the system according to a clustering analysis result to realize system partitioning; obtaining participation factors of all generator sets of the system to obtain leading generator sets in all system partitions; and selecting installation points of a PMU device according to a system partitioning result and the leading generator sets, measuring power changes and system frequency changes on tie lines of all regions after system disturbance, and carrying out partitioning inertia evaluation on the system. According to the method, the system partitions and the leading generator set of each partition can be reasonably determined, and the inertia of each partition isevaluated by utilizing disturbed data.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a method for evaluating inertia of system partitions based on coherence identification. Background technique [0002] As the penetration rate of photovoltaic and wind power in the system increases, the inertial time constant of the grid decreases, and the ability to maintain system frequency stability decreases. The inertia level of the system represents the ability of the system to suppress frequency changes when power imbalance occurs, usually with inertial time The important indicators such as the initial frequency drop speed, the lowest point of frequency and the time when the lowest point occurs after the grid has an active power deficit are closely related to the system inertia time constant H. Relevant literature points out that the reduction of inertia will make the frequency fluctuation range larger when the system is running in a steady state, and it is easy to fr...

AI Technical Summary

Problems solved by technology

In recent years, with the large number of PMU (synchronous phasor measurement unit) equipment in the power grid, there have been a large number of literatures on the evaluation and research of the overall and regional inertia of the system based on the disturbed data measured by the PMU. The overall evaluation of the system does not take into account the distribution characteristics of the system inertia; and for the regional evaluation of the inertia, the area is generally divided based on the geographical location, and the rationality of the division has not been proved theoretically.

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