Out-of-step solution method with self-adaptive function

Abstract

An out-of-step solution method with a self-adaptive function relates to an emergency protection method that can complete automatic switching in case of abnormality of an AC and DC grid, in particular to an out-of-step solution method with the self-adaptive function, which is used for out-of-step fleet solution of a strong connection grid system. The method comprises the following steps: performing EEAC simulation for failures of the strong connection grid, so as to determine a potential instability mode; obtaining a power angle rocking curve of a generator according to transient simulation, so as to identify coherence fleet, wherein affected system is divided into a coherence instability region and a coherence stable range; determining a center of oscillation and installing a solution device; real-timely acquiring running state data of the grid system by utilizing a PMU, so as to detect whether the system is out of step; setting the solution conditions, automatically capturing the center of oscillation, selecting the solution device in a self-adaptive manner, and starting the solution operation. Due to the adoption of the method, in case the system is out of step, automatic solution is ensured while respective synchronicity of the solved subsystems is ensured, and accordingly, safe and stable operation of the grid is ensured.

Description

technical field [0001] The invention relates to an emergency protection method capable of automatic switching when an abnormal state occurs in an AC and DC power grid, in particular to an out-of-synchronization decoupling method with self-adaptive function for decoupling of out-of-synchronization machine clusters in a strongly connected power grid system. Background technique [0002] The practice of large-scale power grid operation shows that some complex faults caused by various factors that are difficult to predict in advance may occur in the power system, and may cause out-of-synchronization between different generator groups. In this case, if the decoupling of out-of-step generating units cannot be realized quickly, it may lead to the expansion of the accident, and even lead to the occurrence of large-scale power outages in the system. In recent years, there have been accidents in many countries that evolved from successive interruptions to blackouts. One of the main re...

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Problems solved by technology

[0020] based on The desynchronization criterion of the system can reflect the change of the lowest voltage in the process of system out of step and can accurately judge whether the system is out of step. This method can automatically adapt to various operating modes of the system and changes in the system structure, and can capture When the out-of-step center appears, but it is difficult to capture the position of the out-of-step center, other auxiliary criteria are needed

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