Protection control method suitable for elastic intelligent power distribution networks of various fault types

Abstract

The invention provides a protection control method suitable for elastic intelligent power distribution networks of various fault types, and the method comprises the steps: carrying out the current break variable detection of a main network side and a distributed power supply side of a power distribution line, starting a protection device of the power distribution line once a large change of a current is found, and transmitting a starting signal to all protection devices at the downstream of a segmented line; acquiring power frequency split-phase total current amplitudes of a main network sideand a distributed power supply side of the distribution line, substituting the power frequency split-phase total current amplitudes into a fault current comparison criterion to judge a fault type, andtripping off switches on two sides of the fault line if the line current is zero to prove that a disconnection fault occurs; if overcurrent occurs in the line current, proving that a short-circuit fault occurs, and if the power frequency split-phase total current amplitude meets the amplitude difference comparison criterion, protection acting, and tripping off circuit breakers on the two sides. The influence of various fault types on power distribution network protection in extreme weather is solved, and the elasticity of the intelligent power distribution network in extreme weather is improved.

Description

technical field [0001] The present disclosure relates to the technical field of elastic intelligent distribution network protection, in particular to a protection control method for elastic intelligent distribution network applicable to various types of faults. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] In recent years, due to global climate change and global warming, extreme weather such as hurricanes and ice storms have become more frequent and more intense. Large-scale power outages caused by extreme weather continue to occur around the world, resulting in huge economic losses. In recent years, with the access of distributed power sources and large-scale construction and transformation, the smart distribution network has made great progress. As a power system directly connected to users, the normal operation of distribution net...

AI Technical Summary

Problems solved by technology

However, the current research on distribution network resilience improvement measures is still mainly focused on strategies such as undergrounding equipment, strengthening distribution network components, and improving power supply recovery capabilities, and there is a lack of research on the protection of elastic smart distribution network under extreme weather.

Distribution network faults caused by extreme weather are different from traditional distribution network faults. The probability of distribution network disconnection faults under extreme weather is greatly increased, and most of them are complex and multiple faults. The realization of protection reliability, quick action, selectivity and sensitivity brings challenges

The current distribution network protection can only deal with short-circuit faults, and cannot judge and isolate disconnection faults. It can only rely on user feedback and manual line inspection, which greatly reduces the flexibility of the distribution network.

Images