Distributed fault detection and isolation system and working method for smart distribution network

Abstract

The invention discloses an intelligent distribution network oriented distribution type fault detection and isolation system and a working method. The distribution type fault detection and isolation system comprises intelligent power distribution terminals arranged in each measurement point of the intelligent distribution network, and a management maintenance work station arranged in a transformer substation; the intelligent power distribution terminals are in peer-to-peer communication; and the intelligent power distribution terminals and the management maintenance work station are in master-slave mode communication. The intelligent distribution network oriented distribution type fault detection and isolation system has the beneficial effects that the management functions of the management maintenance work station on remote measuring, remote signaling, remote control and the intelligent terminals can be realized due to the communication between the intelligent power distribution terminals, and the communication between intelligent power distribution terminals and the management maintenance work station; and the intelligent power distribution terminals can realize peer-to-peer fault information interaction with adjacent intelligent power distribution terminals according to the current network topology so as to realize accurate and effective isolation for the fault regions, and satisfy the demands of rapidness, flexibility and reliability of the intelligent distribution networks on the fault detection and isolation.

Description

technical field [0001] The invention belongs to the technical field of intelligent distribution network fault detection and isolation, and in particular relates to a distributed fault detection and isolation system and working method for intelligent distribution network. Background technique [0002] The smart distribution network integrates power distribution technology, sensing and measurement and control technology, and is based on safe and fast computer communication technology. It allows access to a large number of distributed power sources DG (Distributed Generation) and provides users with high-quality power at selected times. , can quickly, flexibly and reliably detect and isolate distribution network faults. [0003] The important difference between the smart distribution network and the traditional distribution network is that the smart distribution network has a self-healing function, which means that the smart distribution network provides users with uninterrupte...

AI Technical Summary

Problems solved by technology

[0004] In traditional distribution networks, circuit breakers and various reclosers (voltage-type reclosers or current-type reclosers) are mostly used to complete fault isolation. This fault detection and isolation scheme is low in cost and easy to implement, but the fault isolation time is relatively long. It is usually tens of seconds or even a few minutes, which cannot meet the rapid self-healing requirements for fault isolation, and during the fault detection and isolation period, the circuit breaker needs to perform multiple opening and closing operations, and the non-faulty area on the faulty line There will also be some power outages

In addition, the detection and isolation of faults can be completed with the help of the distribution network automation system. This solution needs to be implemented with the help of a communication system, and the cost is relatively high. Although it can reduce the number of operations of the circuit breaker, it still takes a long time, and it takes a few seconds at the fastest. It is still difficult to meet the rapidity of self-healing for fault isolation

Moreover, this type of solution is highly dependent on the master station of the automation system. Once the master station system fails or the communication system is unreliable, it will lead to serious consequences such as prolonged fault isolation time and expanded power outage area.

[0005] With the development of distributed generation technology, more and more distributed generation (DG) is connected to the distribution network or connected to the distribution network after forming a micro-grid, which will lead to a further increase in the number of branches of the distribution network. , the network structure is more complex, so it will increase the probability of failure

The access of distributed power makes the traditional radial network of the distribution network into a multi-terminal power network. Not only the network structure and properties have changed, but the existence of DG makes the change of electrical quantity more complicated after the fault occurs, which brings great pressure on the power distribution network. Network fault detection and isolation pose greater challenges

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