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Current power flow controller site selection method based on coupling sensitivity analysis

A technology of sensitivity analysis and power flow controller, which is applied in the direction of power transmission AC network, electrical components, circuit devices, etc., can solve the problems of non-decoupling of output voltage of full-bridge converter and inapplicability of DCCFC site selection, etc., and meet the requirement of reducing capacity , Improve the effect of construction economy

Active Publication Date: 2020-08-11
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0004] The current sensitivity analysis can intuitively describe the sensitivity of the line current to the control variables of the device, and the site selection of the power flow controller can be carried out based on the sensitivity analysis results. However, the output voltage of the DC CFC full-bridge converter on each controlled branch is unclear coupling, so the traditional sensitivity analysis based on a single control variable is not suitable for DC CFC siting, so it is necessary to develop a current flow controller siting method based on coupling sensitivity analysis

Method used

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  • Current power flow controller site selection method based on coupling sensitivity analysis
  • Current power flow controller site selection method based on coupling sensitivity analysis
  • Current power flow controller site selection method based on coupling sensitivity analysis

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Embodiment

[0081] In order to verify the effectiveness of the scheme of the present invention, the effectiveness of the proposed method is verified by taking the DC power grid formed by adding branches L13 and L15 to the Zhoushan five-terminal DC system as an example, and the voltage level of the power grid is 400kV.

[0082] figure 2 The grid topology is shown. 1, 2, 3, 4, and 5 in the figure are the numbers of the converter stations, the number of AC-DC converter stations (nodes) is 5, node 1 of the converter station is the V node, and the remaining nodes are P nodes.

[0083] Table 1 shows the DC grid system parameters before installing CFC.

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Abstract

The invention discloses a current power flow controller based on coupling sensitivity analysis. The method comprises steps of inputting initial data of a power grid; performing initial load flow calculation on the direct-current power grid; calculating the coupling sensitivity of each branch current to the equivalent ideal transformer transformation ratio introduced by the DC CFC on each controlled branch when the DC CFC is installed at different positions of the DC power grid by using a sensitivity analysis formula; establishing a DC CFC configuration index; sorting the LI values of the branches of the direct-current power grid; and carrying out DC CFC site selection. The optimal configuration position of the DC CFC can be determined, the capacity requirement for the DC CFC is reduced, and the construction economy is improved.

Description

technical field [0001] The invention relates to a current flow controller, in particular to a site selection method for a current flow controller based on coupling sensitivity analysis. Background technique [0002] The current flow controller (DC current flow controller, DC CFC) provides the possibility for the further development of the DC power grid by virtue of its powerful power flow regulation ability, simple structure and the potential to expand multiple degrees of freedom. As a voltage-changing DC power flow controller, DC CFC is somewhat different from the traditional DC / DC converter type and auxiliary voltage source type power flow controller topology. It has a simple structure, requires fewer power electronic devices, and only performs directional and quantitative transmission of power flows between lines without energy exchange with the external power grid. It does not need to withstand high voltage at the system level. Good application prospects. [0003] With...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/00H02J3/36
CPCH02J1/00H02J3/36H02J2203/10H02J2203/20Y02E60/60
Inventor 甄浩张岱岳王松王谱宇杨伟周凌柯卜京
Owner NANJING UNIV OF SCI & TECH
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