AC-DC series-parallel DC multi-feed-in receiving-end power grid intensity obtaining method
A technology of AC-DC hybrid connection and receiving-end power grid, which is applied in the direction of power transmission AC network, etc., to achieve the effect of clear physical meaning
Inactive Publication Date: 2020-02-07
STATE GRID ZHEJIANG ELECTRIC POWER +1
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Problems solved by technology
[0004] In order to solve the above problems, the present invention proposes a method for obtaining the strength of the AC-DC hybrid DC multi-feed receiving end grid considering the reactive power compensation capacitor, which is used to overcome the need to assume that the DC consumption of reactive power is approximately fully compensated in the derivation process of the generalized short-circuit ratio , the defect that the reactive power compensation capacity is proportional to the rated capacity of the DC system, and can accurately judge the strength of the AC-DC hybrid DC multi-infeed receiving end grid considering the reactive power compensation capacitor
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[0039] This embodiment provides a method for obtaining the power grid strength of an AC-DC hybrid DC multi-infeed receiving end considering reactive power compensation capacitors, and the steps are as follows:
[0040]Through the saddle node bifurcation analysis method of static voltage stability, the system characteristic equation of the DC multi-infeed system is established, and the DC transmission power diagonal matrix is obtained from the grid detection and converted into an inverse matrix diag -1 (P 1 ,...,P n ), n represents the total number of DC in the AC-DC system, P i Indicates the transmission power of the i-th DC, and the equivalent admittance matrix B′ considering the reactive power compensation capacitor is obtained from the AC grid at the receiving end through Thevenin equivalent, and the inverse matrix diag -1 (P 1 ,...,P n ) and the equivalent admittance matrix B′ considering the reactive power compensation capacitor are substituted into the system chara...
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The invention discloses an AC-DC series-parallel DC multi-feed-in receiving-end power grid intensity obtaining method. The method comprises the following steps: establishing a system characteristic equation of a direct-current multi-feed-in system considering reactive compensation capacitance through a saddle node bifurcation analysis method with stable static voltage; obtaining a direct-current transmission power diagonal matrix through power grid detection and converting the diagonal matrix into an inverse matrix; obtaining an equivalent admittance matrix considering the reactive compensation capacitance through Thevenin equivalence of a receiving-end alternating-current power grid, and substituting the inverse matrix and the equivalent admittance matrix into the system characteristic equation for solving to obtain an effective generalized short-circuit ratio of the direct-current multi-feed-in system; and carrying out judging according to the effective generalized short-circuit ratio to obtain receiving-end power grid intensity of the direct-current multi-feed-in system considering the reactive compensation capacitance. The effective generalized short-circuit ratio is clear in physical mechanism and accurate in depiction of the intensity of the alternating current system, and can be applied to judgment of the intensity of the AC-DC series-parallel DC multi-feed-in receiving-end power grid considering the reactive compensation capacitance, so that the AC-DC series-parallel DC multi-feed-in system operates stably.
Description
technical field [0001] The invention relates to a method for obtaining the strength of a receiving-end power grid, in particular to a method for obtaining the strength of an AC-DC hybrid DC multi-feed receiving-end power grid considering reactive power compensation capacitors. Background technique [0002] Due to the distribution of energy and load in my country, hydropower resources are concentrated in the southwest region, wind, solar and thermal power resources are concentrated in the northwest region, and load centers are concentrated in the central and eastern regions and the eastern coastal regions. The construction of regional power transmission channels is particularly urgent. In recent years, with the rapid development and commissioning of grid commutation HVDC transmission technology, DC multi-infeed systems in which multiple DC drop points are concentrated on the same AC receiving end grid have been formed in my country's Sanhua and Southern Power Grids. [0003] ...
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IPC IPC(8): H02J3/36
CPCH02J3/36Y02E60/60
Inventor 徐谦戴攀辛焕海汪家铭章枫
Owner STATE GRID ZHEJIANG ELECTRIC POWER