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A Frequency Closed-loop Control Method Based on SVG to Dynamically Suppress Power Grid Subsynchronous Oscillation

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

Active Publication Date: 2019-06-04
TBEA SUNOASIS +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A Frequency Closed-loop Control Method Based on SVG to Dynamically Suppress Power Grid Subsynchronous Oscillation
  • A Frequency Closed-loop Control Method Based on SVG to Dynamically Suppress Power Grid Subsynchronous Oscillation
  • A Frequency Closed-loop Control Method Based on SVG to Dynamically Suppress Power Grid Subsynchronous Oscillation

Examples

Experimental program
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Effect test

Embodiment

[0046] Such as figure 1 As shown, this embodiment provides an SVG-based online dynamic frequency closed-loop control method for suppressing power grid subsynchronous oscillation, which includes the following steps:

[0047] S100. Collect the three-phase voltage u of the power grid a , u b , u c .

[0048] Preferably, the built-in voltage sensor of SVG is used to realize the grid three-phase voltage u a , u b , u c collection.

[0049] 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.

[0050] Preferably, as figure 2 As shown, step S200 includes the following steps:

[0051] 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 sub-synchronous 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 sub-synchronous oscillation of the power grid; getting the difference between the actual frequency value for suppression of sub-synchronous oscillation of the power grid and a reference frequency value for suppression of sub-synchronous 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 sub-synchronous oscillation of the power grid, and suppressing sub-synchronous oscillation of the power grid. The control method of the invention can dynamically and effectively suppress sub-synchronous 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 VarGenerator, static var generator) to dynamically suppress grid subsynchronous oscillation. 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 transmissi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/24H02J3/18
CPCY02E40/10
Inventor 郝翔刘伟增薄志刚黎小林许树楷陈名
Owner TBEA SUNOASIS
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