Method, device and system for inhibiting low-frequency oscillation of power system

A power system, low-frequency oscillation technology, applied in circuit devices, reducing/preventing power oscillations, electrical components, etc., can solve problems affecting damping effects, heavy workload, restrictions, etc., and achieve strong system operability and computational complexity low effect

Active Publication Date: 2011-04-27
STATE GRID CORP OF CHINA
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Problems solved by technology

[0008] However, the above-mentioned measures have certain limitations to varying degrees.
The limitations of installing a power system stabilizer in the generator excitation system to suppress the low-frequency oscillation of the power system are: first, the number of generators in the power system is large and the distribution points are wide, and the workload of configuring a power system stabilizer for each unit is large; Second, in actual operation, some unit power system stabilizers may be out of operation without monitoring due to management or technical factors, affecting the damping effect; th...

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  • Method, device and system for inhibiting low-frequency oscillation of power system
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  • Method, device and system for inhibiting low-frequency oscillation of power system

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Embodiment Construction

[0050] The present invention will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are illustrated.

[0051]The appearance of variable frequency transformer provides a new option for suppressing low frequency oscillation. The core components of the variable frequency transformer include a rotary transformer with single-phase windings on both the stator and rotor sides. The DC motor drive system is used to adjust the phase displacement of the rotor magnetic field relative to the stator magnetic field, and to control the magnitude and direction of the output power through the variable frequency transformer. The technical solution in the present disclosure uses the power adjustment capability of the frequency conversion transformer to suppress low-frequency oscillation. As the equipment for suppressing low-frequency oscillation, the variable-frequency transformer works by dynamically adjusting the pow...

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Abstract

The invention discloses a method, device and system for inhibiting the low-frequency oscillation of a power system. The method comprises the following steps: determining a system transfer function of an interconnected power system section of a variable-frequency transformer (VFT); determining parameters of a damping controller in accordance with the system transfer function; and using the VFT to inhibit the low-frequency oscillation of the power system based on the parameters of the damping controller. In the method, device and system for inhibiting the low-frequency oscillation of a power system, the control objective is definite, and the parameters of the damping controller can be adjusted in time by simply tracking the response of an analytic system to the turbulence without learning about the specific structure and parameters of the system or solving complicated power system equations. Thus, the invention achieves a favorable effect on inhibiting the low-frequency oscillation in the system, thereby being beneficial to promoting the security and stability of the power grid.

Description

technical field [0001] The invention mainly relates to the technical field of safe operation and control of electric power systems, in particular to a method, device and system for suppressing low-frequency oscillations of electric power systems. Background technique [0002] The interconnection of large power grids is the basic trend of the development of power grids in the world, and the interconnection of large power grids may cause low-frequency power oscillation problems. The oscillation frequency is generally between 0.1-2.0Hz. When the oscillation mode is weakly damped or even negatively damped, it will It may lead to grid instability and endanger the security of the grid. [0003] In the 1960s, power low-frequency oscillations occurred in the North American power system. Since the 1980s, with the increase in the proportion of large-scale unit rapid excitation systems and the large-scale interconnection of power grids in my country, low-frequency oscillations have al...

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Application Information

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IPC IPC(8): H02J3/24
CPCH02J3/24H02J3/241
Inventor 陈葛松
Owner STATE GRID CORP OF CHINA
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