Power grid AC/DC cooperation control method after direct current block fault

Abstract

The invention provides a power grid AC / DC cooperation control method after a direct current block fault. The method comprises steps that characteristic quantity of a power grid is extracted based on power grid operating data obtained by a (Wide Area Measurement System), and the power limit of an interconnection tie of the regional power grid during static and stable operating is calculated; the overshoot of the power fluctuation peak value of the interconnection tie is calculated according to disturbance information which happens to the regional power grid; a load shedding quantification control measure needing to be taken is calculated based on the interconnection tie power peak value fluctuating theory and the unbalanced power redistribution theory. The method provided by the invention utilizes direct current power emergency control, so that coordination and cooperation of control measures between a large capacity direct current receiving end Central China power grid ultrahigh voltage alternating current system and a direct current system, thereby replacing or reducing the load shedding quantity of the Central China power grid, effectively improving the safety and operation efficiency of the power grid, and alleviating pressure that the imbalance impact power of the power grid is wide in influence range, the load shedding quantity is large and the like.

Description

technical field [0001] The invention relates to the technical field of power grid control, in particular to an AC-DC coordinated control method for a power grid after a DC blocking fault. Background technique [0002] The Hami-Zhengzhou 800kV DC transmission project (referred to as "large-capacity DC") is the first UHV DC transmission project in Xinjiang, and also the first wind-fired bundling and DC transmission project in my country. With the large-capacity DC project put into operation, higher requirements have been put forward for the safe and stable operation of the 750kV AC interconnected grid in Northwest Xinjiang at the DC sending end and the North China-Central China UHV AC interconnected grid at the DC receiving end. [0003] As a large-capacity DC receiving-end AC power grid, the North China-Central China Power Grid will present the characteristics of large-capacity AC-DC hybrid / parallel operation in the early stage of interconnection, and the problem of strong di...

AI Technical Summary

Problems solved by technology

[0005] However, judging from the existing literature, there are still some deficiencies in the safety control measures and AC-DC coordinated control strategies for large-capacity UHVDC projects after DC blocking faults

In addition, most of the existing AC-DC coordinated control methods rely on simulation calculations, there are certain simulation errors, and it is impossible to implement online formulation of safety control measures

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