Energy control method and system for flexible direct-current interconnection energy-storage-free system in low-voltage transformer area

Abstract

The invention relates to an energy control method and system for a flexible direct-current interconnection energy-storage-free system in a low-voltage transformer area. The method comprises the following steps: classifying transformer areas; when the fault area does not exist and the net power of the direct current side is positive, determining non-fault areas, calculating the residual active allowance of each non-fault area, and determining an active allowance array of the non-fault areas; executing direct current side load power distribution, and determining a first power constant value of a converter of a transformer area in the non-fault transformer area array; updating the active load of each transformer area, calculating the load rate of each transformer area, and re-determining a normal transformer area and a heavy-load transformer area; calculating an active compensation margin of each normal transformer area and an active compensation demand of each heavy load transformer area, and determining a margin array and a demand array; determining an active compensation demand array of the fault transformer area and adding the active compensation demand array into the demand array; updating the current converter margin of each transformer area; and determining a second power constant value of the current converter of each transformer area according to the demand array, the margin array and the current converter margin, and sending a control instruction to the corresponding current converter.

Description

technical field [0001] The present invention relates to the technical field of voltage AC and DC hybrid power distribution, and more specifically, relates to an energy control method and system for a flexible direct interconnection non-energy storage system in a low-voltage station area. Background technique [0002] The distribution station area is one of the important components of the power system, which directly affects the local economic development and the quality of daily life of users. Most of the existing low-voltage station districts use a single transformer and single-line power supply, which has low reliability, and the power supply between each station is independent, lacking unified control. In rural areas, with the construction of beautiful villages, the promotion of rural electrification projects by the government, and the opening up of public transformer capacity, the users of these station areas have increasingly high requirements for power supply reliabili...

AI Technical Summary

Problems solved by technology

[0004] The present invention proposes an energy control method and system for a flexible direct interconnection without energy storage system in a low-voltage station area, so as to solve the problem of how to realize load balance in the station area

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