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

A low-frequency oscillation, power system technology, applied in the direction of reducing/preventing power oscillation, can solve problems such as difficulty in suppressing, involving a wide range of areas, and weak connections

Inactive Publication Date: 2013-09-18
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +2
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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 t

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

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Embodiment Construction

[0082] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0083] Such as figure 1 as shown, figure 1 It is a flow chart of a coordinated damping control method for low-frequency oscillation of power systems based on WAMS in the present invention, including area division, low-frequency oscillation feature identification, system reduced-order model identification, and damping according to different oscillation types (local mode or interval mode) Controller design.

[0084] Coordinated damping control method for power system low-frequency oscillation based on WAMS, the method steps are:

[0085] Step 1: Extract the power angle, angular velocity, active power and disturbance signal of each generator collected by the WAMS of the power system;

[0086] Step 2: Preprocess the power angle, angular velocity, active power and disturbance signal of each generator extracted from the WAMS of the power system to obtain...

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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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Application Information

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IPC IPC(8): H02J3/24
Inventor 马燕峰赵书强胡永强
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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