Dynamic reactive planning site-selection analysis method and system considering transient voltage stability

Abstract

The invention discloses a dynamic reactive planning site-selection analysis method and system considering transient voltage stability. The dynamic reactive planning site-selection analysis method comprises the steps of obtaining related data of a power grid firstly; then performing simulation analysis on the transient voltage stability of the power grid, analyzing the power grid faults to determine a transient voltage instability fault set, and dividing the transient voltage instability fault set into multiple transient voltage stable weak regions; next, calculating the dynamic reactive compensation sensitivity under each fault state, and determining the number and locations of the to-be-compensated points of one of the power grid fault weak region through a panning site-location combinational analysis method; and finally, outputting the position scheme of the dynamic reactive planning site-selection to-be-selected points of all the transient voltage stable weak regions. Compared with the prior art, the dynamic reactive planning site-selection analysis method and system are suitable for dynamic reactive planning site-selection in the alternating current/direct current hybrid power grid, have the advantages of high efficiency, simplicity, tight combination with engineering and the like; and in addition, the redundancy of the dynamic reactive planning site-selection to-be-selected compensation points can be effectively prevented.

Description

technical field [0001] The invention relates to a reactive power compensation site selection method, in particular to a dynamic reactive power planning site selection analysis method and system considering transient voltage stability, and belongs to the technical field of power system reactive power compensation. Background technique [0002] my country's DC power transmission has already reached a certain scale, and UHV AC is also being vigorously developed and successively constructed. A number of UHV AC projects have been completed and put into operation (such as Jindongnan-Nanyang-Jingmen, Huainan-Huxi and other UHV AC projects) Engineering), the regional grid structures in East China and South China are relatively complex, and the load growth is relatively fast, and there are multiple UHV connections. With the development of the future power grid, the transient voltage stability of such load center areas has a greater impact challenge. In order to enhance the transient v...

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Problems solved by technology

However, only relying on static voltage stability to study the weak areas of voltage stability of the power grid has certain limitations. Several transient voltage stability indicators have also been proposed in the current research. Among them, the voltage drop index after a fault can reflect the transient recovery ability of the power grid. The maximum fault clearing time index can evaluate the longest time that the grid operation is under fault. These indicators are greatly affected by the grid topology and control system, and have certain limitations.

In addition, the energy function method can be used to evaluate the voltage stability of the power grid after a fault, but because it is difficult to construct the energy function method, more research is needed on the evaluation of the transient voltage stability of the energy function method

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