DC power distribution network fault disturbance identification method based on mutation integral product

Abstract

The invention discloses a DC power distribution network fault disturbance identification method based on a mutation integral product. According to the method, mutation integral operation of a mode current at two sides of a DG or a micro-power-grid in a DC power distribution network is performed during a fault transient-state period, an operation result is regarded as identification basis of line fault and power disturbance of the DC power distribution network based on the mutation direction and a product result, a disturbance identification signal is transmitted to a converter station, protective maloperation caused by power fluctuation of the DG (micro-power-gird) can be effectively avoided, and the determination of a fault occurrence section is assisted. According to the method, comparedwith non-unit protection, selectivity and reliability are further achieved, only identification information during the transient-state period needs to be transmitted, the communication traffic is small, the time delay is short, speed is further achieved compared with differential protection, and a certain application value is provided in the DC power distribution network with short lines.

Description

technical field

[0001] The invention belongs to the field of identification of faults and disturbances in flexible direct current distribution networks, and relates to a reliable identification method for faults and disturbances in direct current distribution networks with distributed power generation devices or microgrids connected, in particular to a direct current system based on mutation integral products Distribution network fault disturbance identification method. Background technique

[0002] At present, the protection configuration of the DC distribution network is not complete. Common single-ended quantity protections such as traveling wave protection and differential undervoltage protection have poor applicability to complex DC distribution networks with distributed generation (Distributed Generation, DG) or micro-grid access. Out-of-area faults, complex setting and coordination. The current differential protection based on double-terminal quantity can meet the s...

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