An intelligent terminal based on area protection in a power network and its control method

Abstract

The invention provides an intelligent terminal based on area protection in a power network, which includes a main controller formed by an ARM main chip and its corresponding peripheral circuits, a data communication unit connected to the main controller, a power supply unit and a remote control unit. Communication unit: the data communication unit is also connected to each combining unit in the power network; the remote control and remote signaling unit is also connected to each connection switch in the power network, which includes a remote control module and a remote signal module; there are three levels on the remote control module The electronic lock watchdog and the locking anti-jump circuit can eliminate the fatal damage to the device caused by the switch refusal. The remote signaling module is equipped with a filter circuit and a photoelectric isolation circuit to prevent signal interference. The implementation of the present invention can be applied to various grid structures and different system operation modes, has multiple functions, quickly realizes fault removal, isolation and load transfer, reduces network reconfiguration time, and improves the safety and reliability of smart grid operation sex.

Description

technical field [0001] The invention relates to the technical field of power grid fault processing, in particular to an intelligent terminal based on area protection in a power network and a control method thereof. Background technique [0002] Distribution automation is an important part of smart grid, and its core is distribution network fault handling, which is of great significance for improving power supply reliability, expanding power supply capacity and realizing efficient and economical operation of the power grid. , resulting in a new type of protection strategy, that is, regional protection. Regional protection adopts a brand-new distributed protection cooperation idea to ensure that the circuit breaker closest to the fault point trips quickly, and other switches enter the backup without tripping, so that the fault power outage range is the smallest and the fault power outage time is the shortest. At the same time, the primary equipment is intelligentized on-site....

AI Technical Summary

Problems solved by technology

[0005] The advantage of this protection mode is that it can be controlled accurately, it is suitable for various complex systems, and the economic cost is relatively low, but the disadvantage is that it needs reliable communication channels and computer software and hardware systems in the control center, and it can only be used for power supply. Power transmission lines in areas with low reliability requirements

[0007] The advantage of this protection mode is: on the one hand, it no longer depends on the master station to handle every fault that occurs on site, even if the communication is interrupted, it will not affect the speed of fault processing and the time to restore power supply; on the other hand, automatic fault location and network The speed of reconstruction will be significantly improved, but the disadvantage is that due to the single function of the existing intelligent terminal, when the location of the distributed power supply connected to the distribution network is not fixed, the protection setting value and strategy on the intelligent terminal are different from those of the distributed power supply. It is difficult to effectively coordinate and match the randomness of the power supply, which leads to serious errors in fault isolation and load transfer operation

Images