Method and system for eliminating low-frequency oscillation between generators

A low-frequency oscillation and generator technology, applied in the control of generators, motor generator control, control systems, etc., can solve problems such as deterioration of control effects, achieve the effects of preventing power fluctuations, suppressing low-frequency oscillations, and ensuring safe and stable operation

Active Publication Date: 2013-10-09
魏强 +1
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  • Abstract
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Problems solved by technology

However, how to select the measurement / feedback signal and how to prevent the signal transmission delay from deteriorating the control effect are all problems to be solved

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  • Method and system for eliminating low-frequency oscillation between generators
  • Method and system for eliminating low-frequency oscillation between generators
  • Method and system for eliminating low-frequency oscillation between generators

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Embodiment Construction

[0024] The present invention will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are illustrated. The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0025] In recent years, with the development of synchrophasor measurement unit PMU measurement technology, the technology to accurately measure the generator rotor angle, that is, the angle of the generator rotor Q axis in the rotating coordinate system determined by the second pulse, has gr...

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Abstract

The invention discloses a method and a system for eliminating the low-frequency oscillation between generators. According to the method, the absolute rotor angles of the generators are measured, and the rotation speeds of generator rotors are controlled, so that when each GPS (Global Positioning System) pulse per second signal arrives, the absolute rotor angles obtained through measurement are identical; the absolute rotor angles are angles leading GPS reference vectors of internal electric potential Eq of the generators. The method and the system for eliminating the low-frequency oscillation between the generators have the advantages of being capable of realizing the indifference control on frequencies and rotor angles by controlling the absolute rotor angles of the generators, being capable of ensuring that the locations of the generator rotors are unchanged in a PPS (Pulses Per Second) defined rotating coordinate system, well suppressing the low-frequency oscillation under the condition that the remote measurement is not need, also being capable of realizing active automatic local balance during changing in load, preventing the power fluctuation of call wires and ensuring the safe and stable operation of large-scale interconnected networks.

Description

technical field [0001] The invention relates to the technical field of power system operation and control, in particular to a method and system for eliminating low-frequency oscillation between generators. Background technique [0002] At present, after the power system is disturbed, insufficient damping or negative damping may cause the generator's rotor angle, speed, and related electrical quantities (such as line power, bus voltage, etc.) to oscillate with approximately equal amplitude or increased amplitude. Since the frequency is generally around 0.1-2.5Hz, it is called low-frequency oscillation of the power system. Low-frequency oscillations can be broadly classified into local modes and interregional modes. Generally speaking, the more units involved and the wider the area, the lower the oscillation frequency. [0003] After the large-scale interconnection of the power grid, low-frequency oscillation may cause large fluctuations in the power of the tie line, which i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/00H02P9/04
CPCH02M1/12H02P21/05H02P9/105Y02E60/00Y04S10/00Y04S10/22Y02E40/70H02J3/241H02J3/242
Inventor 魏强郭为民
Owner 魏强
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