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Power system stablizer (PSS) commissioning effect evaluation method based on active power and PSS output phase difference

A technology of active power and output phase, applied in the field of measurement, can solve the problem of not testing and evaluating the effect of suppressing low-frequency oscillation of the power grid, and achieve the effects of avoiding generator tripping, improving dynamic stability, and preventing power grid out-of-step

Active Publication Date: 2012-11-28
STATE GRID HEBEI ELECTRIC POWER RES INST +2
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Problems solved by technology

However, after the PSS is put into operation, there is no means to test and evaluate its effect of suppressing the low-frequency oscillation of the power grid

Method used

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  • Power system stablizer (PSS) commissioning effect evaluation method based on active power and PSS output phase difference
  • Power system stablizer (PSS) commissioning effect evaluation method based on active power and PSS output phase difference
  • Power system stablizer (PSS) commissioning effect evaluation method based on active power and PSS output phase difference

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Cangdong Power Plant No. 3 unit, the generator model is QFSN-660-2, and the excitation regulator model is NES5100. The scheme of this embodiment is completed in the industrial computer of the excitation regulator with the corresponding program, and the process is as follows:

[0024] First, take the active power signal of the generator measured by the excitation regulator and the signal output by the PSS as the data source, and convert it into a phase relationship diagram between the active power of the generator and the output signal of the PSS in the industrial computer of the excitation regulator. At the same time, use the industrial computer to calculate the phase difference between the active power signal of the generator and the output signal of the PSS, and the result is

[0025] Then, set the corresponding effective range of PSS phase compensation Judgment dead zone α=5°;

[0026] Finally, make a judgment:

[0027]

[0028] Conclusion: PSS can effective...

Embodiment 2

[0030] Cangdong Power Plant No. 1 unit, the generator model is QFSN-660-2, and the excitation regulator is UNITROL5000 produced by Swiss ABB company. Since the imported equipment cannot be programmed in the industrial computer of the excitation regulator, this embodiment transmits the active power and PSS output signal to the computer with the corresponding program via USB communication. The process mainly includes four steps:

[0031] 1) Complete the transmission of active power and PSS output signal.

[0032] 2) Calculate the phase difference between the active power signal of the generator and the output signal of the PSS

[0033] 3) Set the corresponding effective range of PSS phase compensation And judge the dead zone α=5°;

[0034] 4) Make a judgment:

[0035]

[0036] Conclusion: PSS cannot effectively suppress the low-frequency oscillation of the power grid.

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Abstract

The invention relates to an evaluation method for detecting and evaluating the power system stablizer (PSS) inhibition power grid low-frequency oscillation effect for PSS commissioning effect after a power grid is detected to have low-frequency oscillation. The evaluation method comprises: firstly, calculating the phase difference of the active power of a generator and a PSS output signal; then setting a PSS phase compensation effective range, and judging a dead zone; and finally, evaluating the PSS inhibition power grid low-frequency oscillation effect. The invention has the beneficial effects of evaluating the PSS inhibition power grid low-frequency oscillation effect on line, adjusting the PSS parameters in time, effectively inhibiting the power grid oscillation after regional grids are interconnected and ensuring safe and stable operation of the power grid.

Description

technical field [0001] The invention belongs to the field of measurement technology, and in particular relates to an evaluation method for inspecting and evaluating the effect of PSS suppressing low-frequency oscillation of a power grid, which is used for inspecting the effect of PSS put into operation after low-frequency oscillation occurs in the power grid. Background technique [0002] PSS (Power System Stablizer) for short is an additional excitation control link. In the excitation regulator, by introducing an additional signal, a positive damping torque is generated to overcome the negative damping caused by the excitation regulator, thereby achieving suppression. purpose of low frequency oscillation. However, after the PSS is put into operation, there is no means to test and evaluate its effect of suppressing the low-frequency oscillation of the power grid. Therefore, it is necessary to study and formulate an online index analysis and evaluation system for the effect ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00
Inventor 孟凡超潘瑾郝晓光王原平
Owner STATE GRID HEBEI ELECTRIC POWER RES INST
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