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Method for setting parameters of SVC (supplementary damping controller)

A technology for additional damping and parameter tuning, applied in reactive power adjustment/elimination/compensation, AC network circuits, electrical components, etc., which can solve problems such as inability to directly apply, and achieve the effect of reducing workload

Active Publication Date: 2017-05-17
NARI TECH CO LTD +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the SVC model in some power system electromechanical transient simulation software does not have an interface for adding small signal excitation, so the methods in the above literature cannot be directly applied

Method used

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  • Method for setting parameters of SVC (supplementary damping controller)
  • Method for setting parameters of SVC (supplementary damping controller)
  • Method for setting parameters of SVC (supplementary damping controller)

Examples

Experimental program
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Effect test

Embodiment 1

[0042] This embodiment proposes a parameter tuning method for the SVC additional damping controller, and its implementation process includes: replacing the SVC with a capacitor model with variable susceptance and finding the transfer function from the capacitor model to the input of the additional damping controller and the bus voltage The step of correcting the dominant pole of the transfer function from the obtained variable susceptance capacitor model to the input of the additional damping controller; based on the output of the additional damping controller after replacing the variable susceptance capacitor model with SVC The open-loop transfer function of the quantity to the input quantity The phase angle and amplitude at the dominant pole of the transfer function of the corrected variable susceptance capacitor model to the input quantity of the additional damping controller The step of setting the parameters of the additional damping controller. Its specific process is as ...

Embodiment 2

[0071] image 3 It is a schematic diagram of the test system with four machines and two areas. Bus 8 is the installation point of SVC, and the capacity of SVC is 200Mvar.

[0072] Remove the SVC, and add a capacitor model with variable susceptance on the bus 8. The input of the additional damping controller is assumed to be the active power on a single tie line between bus 8 and bus 9 . Using the test signal method, it can be found that:

[0073]

[0074] From this, the dominant pole of the system is obtained as S d1 =-0.024+3.13i, the system oscillation frequency is 0.5Hz, and the damping ratio is 0.77%. Choose the corrected dominant pole as S d =-0.25+3.3i.

[0075] Remove the capacitor model with variable susceptance, and add SVC to bus 8. The control system of SVC adopts such as figure 2 form shown. G v (s)=K v =20, G Tv (s) and G Tb The inertial time constants of (s) are 0.02s and 0.03s, respectively. With the additional damping controller disconnected, ...

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PUM

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Abstract

The invention discloses a method for setting parameters of an SVC (supplementary damping controller), and belongs to the technical field of power system control. The method comprises the steps of introducing a susceptance variable capacitor; obtaining a transfer function associated with a large power grid by using a test signal method and deducing an open-loop transfer function between an output signal injection point of the supplementary damping controller and an input signal according to an SVC model; and finally calculating the parameters of the supplementary damping controller through a root-locus method. The SVC model is not needed to provide an interface of adding small signal excitation, the application range is wider, simulation and calculation of the test signal method do not need to be carried out again when the parameters of the SVC model change, and the parameters of the supplementary damping controller can be more simply and conveniently obtained.

Description

technical field [0001] The invention belongs to the technical field of electric power system and automation thereof. More precisely, the invention relates to a parameter setting method of an SVC additional damping controller. Background technique [0002] Power system low-frequency oscillations usually appear as power oscillations on transmission lines due to small system damping, and the oscillation frequency is between 0.1-2Hz. Low-frequency oscillation endangers the safe and stable operation of the power system, and measures must be taken to increase the system damping. Static var compensator (SVC) is an important reactive power compensation device. By installing an additional damping controller, the system damping can be improved, and the low-frequency oscillation between regions can be effectively suppressed. [0003] The SVC's additional damping controller is a lead-lag phase compensator. Through reasonable parameter setting, the dominant pole of the closed-loop syst...

Claims

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Application Information

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IPC IPC(8): H02J3/18H02J3/00
CPCH02J3/00H02J3/1821H02J2203/20Y02E40/10
Inventor 李威于洋吕亚洲徐政刘福锁侯玉强周野宋晓芳李碧君薛峰
Owner NARI TECH CO LTD
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