A Stability Control Method Applicable to Multi-level Electromagnetic Ring Networks with Interconnected Main Transformer

Abstract

The invention provides a stability control method suitable for a multi-level (two-level and more than two-level) electromagnetic looped network of an intertripping main transformer, belonging to the field of power grid stability and control. According to the stability control method, a concept of transfer ratio is introduced to calculate whether overloads occur in grid components at different surrounding levels or not and the power flow reduction degree of each component after a strategy is adopted in different initial running modes respectively by adopting or not adopting a stability control strategy after a fault occurs in a certain power transmission channel in the multi-level electromagnetic looped network; and finally, the transient stability of the power transmission channel fault after the stability control strategy is adopted is verified, and if the overload occurs in the grid component, a concept of machine set sensitivity after the fault is introduced to correct power-on combination and machine set output so that the stability control strategy is effective and available. By the stability control method, power loss of the power grid can be prevented, load loss of the power grid also can be prevented, and the problem that power flow overload in grid circuits at upper and lower levels can be easily generated due to heavy through power flow in the multi-level electromagnetic looped network can be solved.

Description

technical field [0001] The invention relates to the field of power grid stability and control, in particular to a stability control method suitable for a multi-stage (two-stage and above) electromagnetic ring network with a main transformer connected to and from the main transformer. Background technique [0002] With the continuous development of the scale of the power grid and the continuous increase of the load, the electromagnetic ring network gradually appeared in the power grid. The electromagnetic ring network can improve the reliability of power supply, but it brings some new problems, such as a serious transmission channel in the upper power grid. After a fault, the power flow passing through the power grid at the same level or the next level will cause the line to be overloaded, resulting in a greater operational risk. In the problem of overloading other lines after a line fault occurs, there are two main stabilization strategies generally adopted: [0003] The fi...

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Problems solved by technology

[0006] The present invention mainly solves the problems existing in the existing stability control strategy scheme, and for the first time proposes a stability control method suitable for the multi-level electromagnetic ring network connected main transformer, which will not cause the power grid to lose power, and will not cause the power grid to lose power. The loss of load can solve the problem that the power flow through the multi-level electromagnetic ring network is heavy, and it is easy to cause the power flow overload of the upper and lower power grid lines

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