Analysis and control method of AC/DC hybrid power grid based on interdependent network

Abstract

The invention discloses an analysis and control method based on a large alternating and direct current parallel serial connection power grid of an interdependency network. A dependency relationship in an alternating and direct current interconnected power grid is built based on the interdependency network principle, and the alternating and direct current relationship in the power grid is reflected from the macroscopic aspect of a power grid frame. The analysis and control method includes the first step of analyzing the power grid frame structure to obtain the dependency relationship in the power grid, the second step of calculating the interdependency index Dep of variables in both parties based on an electromagnetism relation inequation and a flow equation, and the third step of analyzing the relevance among node variables in the power grid, enabling the nodes corresponding to the node variables of which the relevance is 0.2-20 to be strong related nodes, and analyzing and controlling operation of the large alternating and direct current parallel serial connection power grid according to the dependency degree among the strong related nodes. The analysis and control method based on the large alternating and direct current parallel serial connection power grid of the interdependency network can deeply reveal the operation mechanism of the alternating and direct current parallel serial connection power grid from the macroscopic aspect of the power grid, and can be widely applied to flow optimization at various layers.

Description

technical field [0001] The invention relates to the control technology of the AC-DC hybrid large power grid after UHV access, in particular to an analysis and control method of the AC-DC hybrid large power grid based on interdependent networks. Background technique [0002] With the construction and continuous advancement of UHV AC and DC projects in my country, the interconnection between large power grids has been realized. The problem of operation control of the large interconnected power grid is becoming more and more complex, and there are more and more influencing factors. How to ensure the safe and stable operation of the large power grid has always been a permanent topic for electric power workers and scientific and technological researchers. When the UHV power grid is in AC-DC hybrid operation, if the power grid suffers from some kind of external or internal disturbance, it may cause cascading failures, leading to grid instability, resulting in large-scale power out...

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Problems solved by technology

This will lead to a large-scale shift of the tide brought about by the long-term active power deficit, which may induce the collapse of the system

When a DC blocking fault occurs in the DC transmission system, the reactive power demand of the inverter station cannot be met by the compensation capacitor of the inverter station at ordinary times, and this part of the reactive power shortage must be provided by the receiving-end AC system, which will cause the receiving-end AC system of the DC transmission Instantaneous impact of reactive power

If the reactive power compensation cannot be removed in time, the AC voltage will rise, and this instantaneous reactive power impact may cause voltage stability problems in the receiving end power grid.

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