Flexible DC convertor station small interference impedance equivalence method

A flexible DC and converter station technology, applied in the field of efficiency, can solve problems such as excessive calculation amount, influence of solution speed, inability to guarantee accuracy, etc., to achieve the effect of reducing complexity

Active Publication Date: 2016-10-12
ZHEJIANG UNIV +1
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Problems solved by technology

Some existing small-disturbance stability analysis methods for multi-terminal flexible DC systems analyze the eigenvalues ​​of the system characteristic equation matrix, and when the system scale increases, the size of the characteristic equation matrix will also increase, and when the system structure or parameters When changing, it is necessary to recalculate the system characteristic equation of the whole network, and the calculation amount is

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  • Flexible DC convertor station small interference impedance equivalence method
  • Flexible DC convertor station small interference impedance equivalence method
  • Flexible DC convertor station small interference impedance equivalence method

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Embodiment Construction

[0011] The equivalent method of the small disturbance impedance of the flexible direct current converter station of the present invention is especially suitable for end-by-end analysis of small disturbances in the flexible direct current grid. Attached below figure 1 The specific implementation of the present invention will be further described.

[0012] Intelligent measurement and control device is a widely used measurement and control device at present. It usually consists of analog quantity acquisition module, central processing unit, communication module, man-machine interface and other modules.

[0013] figure 1 A simplified model of a flexible DC converter station connected to AC and DC systems is shown, and the method of the present invention is calculated in the intelligent measurement and control device 1 . The analog quantity acquisition module of the intelligent measurement and control device 1 is connected to the AC power supply through the AC voltage transformer...

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Abstract

The invention discloses a flexible DC convertor station small interference impedance equivalence method. In small interference analysis of a convertor station at one end of a flexible DC power grid, small interference impedance equivalence needs to be carried out on the rest parts; a flexible DC convertor station control system is complex; and when the small interference impedance equivalence is carried out thereon, multiple factors need to be taken into consideration. The equivalence mathematic model, taking both operating conditions of a primary system and multiple parameters of local control and coordinated control systems into consideration, has higher accuracy, and realizes balance between rapidity and accuracy of small interference analysis.

Description

technical field [0001] The invention relates to an equivalent method for small-disturbance impedance in small-disturbance stability analysis of a flexible DC power grid, in particular to an equivalent method for small-disturbance impedance of a flexible DC converter station. Background technique [0002] Voltage stability is an important indicator for the safe and stable operation of the AC grid. Compared with the AC grid, the flexible DC grid is usually connected to more power electronic equipment, such as converters, DC transformers, etc. The resistance of these power electronic equipment to voltage fluctuations Ability is usually not high. Therefore, it is more important to maintain the voltage stability of the flexible DC grid. [0003] The static stability analysis of the flexible DC system mainly adopts the small disturbance analysis method at present. Some existing small-disturbance stability analysis methods for multi-terminal flexible DC systems analyze the eigenv...

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Application Information

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IPC IPC(8): H02J3/36
CPCH02J3/36H02J2203/20Y02E60/60
Inventor 徐习东金阳忻董荣森黄晓明陆翌裘鹏
Owner ZHEJIANG UNIV
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