Distributed wide-area self-adaptive interphase backup protection method

Abstract

The invention discloses a distributed wide-area self-adaptive inter-phase backup protection system and method in the technical filed of power system relay protection. The system comprises a protection domain dividing subsystem and a self-adaptive backup protection subsystem. The protection domain dividing subsystem comprises a protection partition module and an information collection module which are sequentially connected. The self-adaptive backup protection subsystem comprises a fault phase selection module, a protection action factor generation module and a protection action criterion module which are sequentially connected. The method comprises the steps that the protection range of an IED is divided, voltage information and current information at the protection installation position on the corresponding position of the IED are collected, a fault phase is recognized according to the collected information, self-adaptive backup protection action factors are generated and whether backup protection acts or not is judged. The distributed wide-area self-adaptive inter-phase backup protection system and method realize the backup protection self-adaptive function, enables the self-adaptive backup protection range to be effectively prolonged, lowers the probability of remote backup protection false action and can meet the selectivity requirement of relay protection when used in cooperation with main distance protection.

Description

technical field [0001] The invention belongs to the technical field of electric power system relay protection, and in particular relates to a distributed wide-area self-adaptive phase-to-phase backup protection method. Background technique [0002] In order to ensure that the relay protection can adapt to the change of the power system operation mode, the traditional distance backup protection has to take the minimum value of the corresponding branch coefficient of each protection in the setting process. However, due to the complexity of the grid structure and the variability of the operation mode, It is difficult to use a set of protection settings to meet the system's requirements for the selectivity, quickness, sensitivity and reliability of protection actions at the same time. In view of this, some experts and scholars have proposed the concept of adaptive protection, that is, the protection that can change the protection performance, characteristics or fixed value in re...

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Problems solved by technology

[0020] Analyzing formula (7), we can see that when When, the protection range P r The value exists, and the protection range P of section II of the distance protection is set at IED1 r After that, the branch coefficient K is calculated in real time by passing the current value of the adjacent line b , and use the formula (4) to get the reliability factor of protection section II After that, put K b and At the same time, enter the formula (1) to set the impedance value of protection stage II in real time Only then can the self-adaptation of the distance protection section II be realized; when When, the protection range P r The value does not exist, that is, the protection stage II cannot meet the requirements of sensitivity and selectivity at the same time, set the impedance value The setting fails, and the self-adaptation of the distance protection section II cannot be realized

[0021] In summary, due to and branching coefficient K b Determined by the system network structure and operation mode, the branch coefficient K is calculated in real time only by passing the current value of the adjacent line b , it may not be possible to realize the self-adaptation of the distance protection section II

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