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Synchronous generator angular velocity measurement method suitable for dual-input power system stabilizers

A technology for synchronous generators and power systems, which is applied to devices using electrical/magnetic methods, etc., can solve the problems of negative damping, poor PSS2A/2B effect, and small operation cycle of excitation regulators to ensure stable operation and measurement. high precision effect

Active Publication Date: 2021-05-28
CHINA SOUTHERN POWER GRID COMPANY +2
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Problems solved by technology

When the generator active power oscillation frequency is less than 0.7Hz, since the operation cycle of the excitation regulator is very small (generally about 3.3ms), it is not sensitive to the oscillation frequency below 0.7Hz, which leads to inaccurate measurement of the angular velocity change, and the PSS2A / 2B effect Poor, even negative damping

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  • Synchronous generator angular velocity measurement method suitable for dual-input power system stabilizers
  • Synchronous generator angular velocity measurement method suitable for dual-input power system stabilizers
  • Synchronous generator angular velocity measurement method suitable for dual-input power system stabilizers

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Embodiment Construction

[0023] The block diagram of the overall realization scheme of the present invention is as figure 2 As shown, the present invention is applicable to the method for measuring the angular velocity of a synchronous generator of a dual-input power system stabilizer, including the following steps:

[0024] 1) Measure the voltage of the synchronous generator, measure the current of the synchronous generator, and generate the signal of the synchronous generator Xq;

[0025] 2) Use the synchronous generator voltage and its current to synthesize the internal potential of the generator;

[0026] 3) Measure the frequency signal of the potential in the synchronous generator.

[0027] The above steps 1) measure the voltage of the synchronous generator, measure the current of the synchronous generator, and generate the signal of the synchronous generator Xq: first design the generator voltage measurement circuit, design the generator current measurement circuit, and design the generation o...

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Abstract

The invention discloses a method for measuring the angular velocity of a synchronous generator suitable for a dual-input power system stabilizer, comprising the following steps: 1) measuring the voltage of the synchronous generator, measuring the current of the synchronous generator, and generating a signal of Xq of the synchronous generator; 2) ) Using the synchronous generator voltage and its current to synthesize the internal potential of the synchronous generator; 3) Measuring the frequency signal of the internal potential of the synchronous generator. The present invention can be used as the accurate measurement of the angular velocity signal of dual-input power system stabilizers such as PSS2A / 2B, PSS3B, PSS4B, etc. After RTDS test and field verification, the present invention enables the excitation system to provide sufficient damping when low-frequency oscillation occurs in the synchronous generator , to ensure the stable operation of the power system, and the measurement accuracy is high.

Description

technical field [0001] The invention relates to a method for measuring the angular velocity of a synchronous generator suitable for a stabilizer of a dual-input power system, and belongs to an innovative technology of a method for measuring the angular velocity of a synchronous generator suitable for a stabilizer of a dual-input power system. Background technique [0002] With the development of the power system and the development of unit excitation control technology, fast excitation regulators are commonly used in medium and large generator sets. While improving the response speed of the system, the fast excitation regulator greatly reduces the time constant of the excitation system and reduces the system damping, so that weak damping or even negative damping often occurs in the system, causing low-frequency oscillations to occur. The generation of low-frequency oscillation in the regional power grid will lead to the over-limit operation of relevant sections and the tripp...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01P3/48
Inventor 梅勇孙新志李鹏徐小方周剑谢惠藩陈刚
Owner CHINA SOUTHERN POWER GRID COMPANY
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