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Method for judging out-of-step oscillation of power system

A technology of power system and discrimination method, which is applied in the direction of measuring electric variables, phase angle between voltage and current, measuring devices, etc., can solve problems such as too many distribution points and difficulty in coordination and cooperation, and achieve less electrical power and reliable system out of step , using simple effects

Active Publication Date: 2013-04-10
NR ELECTRIC CO LTD +1
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Problems solved by technology

[0009] (2) For some large power systems, once out-of-synchronization occurs, its oscillation center is located on multiple contact lines at the same time, forming an out-of-synchronization oscillation section. To implement out-of-synchronization separation for such a system, adopt a decentralized out-of-synchronization The decoupling device requires more layout points, and coordination is difficult

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  • Method for judging out-of-step oscillation of power system
  • Method for judging out-of-step oscillation of power system
  • Method for judging out-of-step oscillation of power system

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Embodiment Construction

[0054] The way to implement it is as follows:

[0055] (1) Synchronize the data of each measuring point;

[0056] (2) Collect the positive sequence voltage of each measuring point, and use Fourier transform to calculate the phase angle of the positive sequence voltage of each measuring point. (3) Select the interval (the range between two measuring points) that needs to be compared (calculate the phase angle difference), and calculate the phase angle difference of each phase comparison interval.

[0057] (4) Carry out phase angle difference trajectory judgment, divide phase angle difference into seven zones:

[0058] θ 1 =300°(-60°) θ 2 =60° θ 3 =90° θ 4 =135°

[0059] θ 5 =180°(-180°) θ 6 =225°(-135°) θ 7 =270°(-90°)

[0060] The phase angle difference locus satisfies " Figure 3-4 ” can be judged as out-of-synchronization.

[0061] The discrimination method provided by the invention has been effectively verified in the RTDS simulation system.

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Abstract

The invention relates to a method for judging out-of-step oscillation of a power system, which comprises the steps of: selecting any two measuring points in the power system, taking positive sequence voltage phases of the measuring points as measuring point phases, wherein a phase angle difference between the two measuring points is used as a phase angle difference of a phase comparison interval (i.e. an interval between the two measuring points). The method is characterized in that: on a change track of the phase angle difference of voltages at two sides of the interval in which an oscillation center is located, the change range of the phase angle difference is divided into 7 regions, if the phase angle difference change track of the phase comparison interval meets a certain change principle, the region between the two measuring points is judged to be step out oscillation. The invention discards the influences of the system operation mode, can be used for independently judging the system to be out-of-step, and is simple in practice.

Description

technical field [0001] The invention relates to a new method for judging the out-of-step oscillation of a power system by using the principle of phase angle difference, which is applied to the judgment when the system is out of step in a safety and stability control system. Background technique [0002] The power system may lose synchronization when it encounters serious faults or multiple accidents. If effective measures are not taken in time, the accident will expand, and even cause serious consequences of large-scale power outages. With the continuous development of the scale of the domestic power grid, regional interconnected power grids have emerged one after another, and the composition of the out-of-synchronization section of the power grid in the process of out-of-synchronization is more complicated. [0003] At present, the principles of oscillation decoupling devices widely used in domestic power system engineering practice mainly include: apparent impedance locus ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08G01R25/00
Inventor 窦乘国吴小辰任祖怡柳勇军俞秋阳孙光辉陈松林
Owner NR ELECTRIC CO LTD
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