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SVG-based frequency closed-loop control method for dynamic suppression of low-frequency oscillation in power grid

A technology of low-frequency oscillation and control method, which is applied in the direction of reducing/preventing power oscillation, flexible AC transmission system, reactive power adjustment/elimination/compensation, etc. problem, achieve the effect of solving the problem of low frequency oscillation, low cost and easy to implement

Active Publication Date: 2017-01-04
TBEA SUNOASIS +2
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Problems solved by technology

However, none of the above-mentioned suppressing devices use full-control power devices, and the effect of suppressing low-frequency oscillations in the power transmission system is very limited.

Method used

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  • SVG-based frequency closed-loop control method for dynamic suppression of low-frequency oscillation in power grid
  • SVG-based frequency closed-loop control method for dynamic suppression of low-frequency oscillation in power grid
  • SVG-based frequency closed-loop control method for dynamic suppression of low-frequency oscillation in power grid

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Embodiment

[0045] Such as figure 1 As shown, this embodiment provides an SVG-based online frequency closed-loop control method for dynamically suppressing low-frequency oscillation of the power grid, which includes the following steps:

[0046] S100. Collect the three-phase voltage u of the power grid a ,u b ,u c .

[0047] Preferably, the built-in voltage sensor of SVG is used to realize the grid three-phase voltage u a ,u b ,u c collection.

[0048] S200. Three-phase voltage u to the power grid a ,u b ,u c Carry out tracking processing to obtain the grid frequency f. The existing frequency tracking technology can be used to monitor the grid three-phase voltage u a ,u b ,u c Perform tracking processing to realize automatic tracking of grid frequency.

[0049] Preferably, as figure 2 As shown, step S200 includes the following steps:

[0050] S201. Convert the grid three-phase voltage u a ,u b ,u c Transformed into the actual value of active voltage u d and the actual...

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Abstract

The invention provides an SVG-based frequency closed-loop control method for dynamic suppression of low-frequency oscillation in a power grid. The control method comprises the steps of: collecting three-phase voltage of the power grid; tracking the three-phase voltage of the power grid to obtain a power grid frequency; filtering the power grid frequency to obtain an actual frequency value for suppression of low-frequency oscillation of the power grid; getting the difference between the actual frequency value for suppression of low-frequency oscillation of the power grid and a reference frequency value for suppression of low-frequency oscillation of the power grid so as to form a power grid frequency deviation value, and performing proportional integral control of the power grid frequency deviation value to obtain a control amount corresponding to the power grid frequency deviation value; conducting closed-loop control of the control amount corresponding to the power grid frequency deviation value to obtain a compensation voltage for suppression of low-frequency oscillation of the power grid, and suppressing low-frequency oscillation of the power grid. The control method of the invention can dynamically and effectively suppress low-frequency oscillation of the power grid.

Description

technical field [0001] The invention relates to the technical field of grid reactive power compensation, in particular to a frequency closed-loop control method based on SVG (Static Var Generator, static var generator) to dynamically suppress low-frequency oscillation of the grid. Background technique [0002] my country has a vast territory, but the distribution of energy and loads is very uneven, so it is inevitable to form large-capacity generator sets, high-power transmission lines and heavy loads. At present, my country is vigorously developing various high-voltage long-distance transmission projects, and the voltage level of transmission lines is getting higher and higher. Although this can effectively solve the problem of insufficient transmission power, from the perspective of the structure of the power grid itself, weak links, long distances and Heavy loads will weaken the damping of the power system. When a disturbance occurs in a certain area, the power system will...

Claims

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Application Information

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IPC IPC(8): H02J3/24H02J3/18
CPCY02E40/10
Inventor 郝翔刘伟增黎小林许树楷陈名
Owner TBEA SUNOASIS
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