Static var generator (SVG)-based given feedforward control method for dynamically inhibiting power grid subsynchronous oscillation

A technology of subsynchronous oscillation and control method, which is applied in the direction of flexible AC power transmission system, multiphase network asymmetry reduction, multiphase network elimination/reduction of asymmetry, etc., and can solve subsynchronous oscillation without fully controlled power devices The suppression effect is limited and other problems, to achieve the effect of solving the problem of subsynchronous oscillation, low cost and easy to implement

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

However, none of the above suppression methods use fully controlled power devices, so the suppression effect on subsynchronous oscillation in the transmission system is very limited

Method used

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  • Static var generator (SVG)-based given feedforward control method for dynamically inhibiting power grid subsynchronous oscillation
  • Static var generator (SVG)-based given feedforward control method for dynamically inhibiting power grid subsynchronous oscillation
  • Static var generator (SVG)-based given feedforward control method for dynamically inhibiting power grid subsynchronous oscillation

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Embodiment

[0041] Such as figure 1 As shown, this embodiment provides a given feed-forward control method based on SVG for online dynamic suppression of power grid subsynchronous oscillation, which includes the following steps:

[0042] S100. Acquire the grid three-phase current i a ,i b ,i c .

[0043] Preferably, the built-in current sensor of SVG is used to realize the three-phase current i of the power grid a ,i b ,i c collection.

[0044] S200. The grid three-phase current i a ,i b ,i c Transformed into the actual value of active current i d and the actual value of reactive current i q .

[0045] Preferably, step S200 is specifically: make the grid three-phase current i in the three-phase static coordinate system a ,i b ,i c Through the abc / dq coordinate transformation, the actual value i of the active current in the two-phase rotating coordinate system is obtained d and the actual value of reactive current i q .

[0046] Specifically, for the grid three-phase curren...

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Abstract

The invention provides a static var generator (SVG)-based given feedforward control method for dynamically inhibiting power grid subsynchronous oscillation. The control method comprises steps of collecting power grid three phase currents; converting the power grid three phase currents into an active current real value and a reactive current real value; filtering the active current real value and the reactive current real value, and carrying out negation to obtain an active current component and a reactive current component for inhibiting power grid subsynchronous oscillation; adding an active current given value in the active current component for inhibiting power grid subsynchronous oscillation to obtain a total active current given value, and adding a reactive current given value in the reactive current component for inhibiting power grid subsynchronous oscillation to obtain a total reactive current given value; and carrying out closed-loop control of the total active current given value and the total reactive current given value to obtain a compensation current for inhibiting power grid subsynchronous oscillation. Therefore, the power grid subsynchronous oscillation is inhibited. The control method can dynamically and effectively inhibit power grid subsynchronous oscillation.

Description

technical field [0001] The invention relates to the technical field of grid reactive power compensation, in particular to a given feedforward control method for dynamically suppressing grid subsynchronous oscillation based on SVG (Static Var Generator, static var generator). Background technique [0002] my country has a vast territory, and the development of energy and economy is reversely distributed geographically, which is extremely unbalanced. Therefore, it is imperative to carry out large-capacity and long-distance power transmission. However, high-voltage, long-distance power transmission technology has the problem of power limitation. [0003] In the existing technology, fixed series compensation transmission technology is generally used to solve the problem of power limitation in high-voltage and long-distance transmission technology, so as to realize safe operation of the power grid and economical power transmission, and solve the problem of limited power transmiss...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/26H02J3/18
CPCY02E40/10Y02E40/50
Inventor 郝翔刘伟增薄志刚黎小林龚文明
Owner TBEA SUNOASIS
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