WAMS (wide area measurement system) based low-frequency oscillation coordinated damping control method for electric power system

Abstract

The invention relates to a WAMS (wide area measurement system) based low-frequency oscillation coordinated damping control method for a power system, and belongs to the technical field of low-frequency oscillation analysis and control of power systems. The method includes adopting a hierarchical clustering technology to perform primary region division according to power angle curves or angular velocity curves obtained after preprocessing, performing low-frequency oscillation mode identification on the system on the basis of a Prony identification algorithm, adopting a PSS (power system stabilizer) to inhibit regional oscillation modes for strong correlation generators with generated low-frequency oscillation modes belonging to regional oscillation modes, introducing wide-area signals of other regions for generators with generated low-frequency oscillation modes belonging to inter-region oscillation modes, designing a controller for a reduced mathematic model of an identification system, and solving parameters of the controller by an LMI (linear matrix inequality). By the low-frequency oscillation controller design method, in a regional and hierarchical control mode, coordinated damping control of the power system is realized.

Description

technical field [0001] The invention relates to a WAMS-based power system low-frequency oscillation coordinated damping control method, which belongs to the technical field of power system low-frequency oscillation analysis and control. Background technique [0002] Due to the unbalanced regional economic development, the significant difference in power loads, and the unbalanced distribution of resources in China, it is urgent to realize the interconnection of power grids to optimize resource allocation. For this reason, the State Grid Corporation of China has proposed a "one special four" power grid development strategy. In order to realize the optimal allocation of resources nationwide. The formation of a large power grid and the complex and changeable operation mode make the problem of low-frequency oscillation occur frequently, which seriously threatens the safe and stable operation of the power system and becomes an important factor hindering inter-regional power exchan...

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Problems solved by technology

The regional low-frequency oscillation is only strongly related to a small number of units, and it is manifested as an out-of-synchronization between a certain generator or a group of generators in the system and other units in the system. The oscillation frequency is roughly between 1Hz and 2.5Hz, and it is limited to the area. The scope of influence is small and easy to eliminate; inter-area low-frequency oscillation refers to the out-of-synchronization between multiple generators in one area and multiple generators in another area in the system, and the oscillation frequency is usually between 0.1Hz and 0.7Hz space, exists in the interconnected power system with weak links, involves a wide range of areas, and is difficult to suppress

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