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Leading-phase adaptive power system stabilizer

A power system, leading phase technology, applied in the direction of reducing/preventing power oscillation, can solve the problems of complex model structure, difficult parameter tuning, limited PSS gain, etc., to meet the phase requirements of compensation characteristics, suppress anti-back modulation, and suppress axis The effect of torsional vibration

Active Publication Date: 2016-08-03
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY +2
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AI Technical Summary

Problems solved by technology

On the one hand, the multi-stage large phase lead compensation link will cause the PSS gain to be limited and seriously weaken its oscillation suppression ability in the middle and low frequency bands; on the other hand, for the uncompensated characteristics at different frequencies, the same set of lead parameters should be used To achieve the compensation effect of the whole frequency band, there are problems such as difficulty in parameter setting, which is not conducive to on-site parameter setting in engineering
[0005] In order to solve the above problems, new PSS researches such as multi-signal input, sub-frequency band suppression and wide-area PSS have been carried out at home and abroad. limitations and other issues

Method used

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Embodiment Construction

[0046] The present invention will be further described below in conjunction with embodiment and accompanying drawing.

[0047] Such as Figure 4 The model structure of the power system stabilizer shown, its design method and working steps are as follows:

[0048] 1) The small signal analysis model of the generator excitation system is as follows: figure 2 as shown, figure 2 In, ΔM e1 and ΔM e2 respectively by K 1 and K 2 The electromagnetic torque of the branch, ΔE fd is the excitation voltage signal increment; ΔE' q is the generator transient potential increment; Δδ is the angle change of the generator; Δω is the speed change; T d ' 0 is the direct-axis transient open-circuit time constant; M is the moment of inertia of the generator; D is the equivalent damping coefficient, K 1 -K 6 is the magnification.

[0049] from figure 2 The relationship between generator speed variation Δω and power angle variation Δδ is obtained in ω 0 is the rated speed of the gen...

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Abstract

The invention discloses a leading-phase adaptive power system stabilizer (PSS). The existing PSS models all adopt a multi-stage large phase lead link. On one hand, a multi-stage large phase lead compensation link limits the gain of PSS and severely weakens the oscillation suppression ability of PSS in medium and low bands. On the other hand, for the characteristic of no compensation at different frequencies, there is a need to use a set of same lead parameters to achieve a full-band compensation effect, which has problems in parameter setting and other aspects and is not conductive to field parameter setting in engineering. According to the invention, after active power negative variation and speed variation vectors are synthesized as PSS input, the torque Delta Mpss generated by V(Pe-Omega) through an excitation system is kept close to a speed axis and even overlaps with the speed axis, so as to compensate the hysteresis characteristics under different oscillation frequencies. Meanwhile, ultra-low frequency filtering enables the power system stabilizer to have the functions of shafting torsional vibration inhibition and anti-reverse adjustment.

Description

technical field [0001] The invention relates to a power system stabilizer for active low-frequency oscillation suppression, specifically a power-rotational speed variation synthetic vector as input, so that it has advanced phase self-adaptive adjustment capability and anti-reactive power "reversal" capability Power system stabilizer. Background technique [0002] With the implementation of the "Sanhua" (North China, East China, and Central China) UHV AC networking of the State Grid Corporation of China and the completion and commissioning of multi-circuit UHV DC, a complex super-large synchronous power grid with multiple voltage levels and AC-DC hybrid connections will be formed across the country. The expansion of the scale of the AC power grid leads to an increase in the equivalent inertia of the entire power system. High-power DC transmission and long-distance heavy-load AC transmission reduce the amount of start-up at the receiving end, the start-up method undergoes a hu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/24
CPCH02J3/24
Inventor 卢岑岑吴跨宇吴龙黄晓明楼伯良沈轶君韩兵陆海清
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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