Urgent and accurate control method and system of large-scale interruptible load

Abstract

The embodiment of the invention discloses an urgent and accurate control method and system of a large-scale interruptible load. The urgent and accurate control method of the large-scale interruptibleload comprises the steps that an area control master station obtains a load capacity cutting sequence table; the area control master station obtains a first load capacity to be cut; the area control master station performs minimum undercut matching according to the first load capacity to be cut, and cuts off a successfully matching load cutting corresponding to control substations; if a second load capacity to be cut exists, the area control master station sends the second load capacity to be cut to the corresponding control substations for load cutting processing. According to the urgent andaccurate control system of the large-scale interruptible load, large-scale dispersive and interruptible load station connection is met, minimum undercut matching is carried out layer by layer, accurate and rapid cutting of the interruptible load according to priority ranking is realized, and the problem of large-area outage loss due to the fact that a large amount of interruptible loads and non-interruptible loads on cut circuits cannot accurately distinguished and the unbalanced capacity is larger after measures are executed is solved.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of power systems and automation thereof, and in particular to an emergency and precise control method and system for large-scale interruptible loads. Background technique [0002] The existing second and third lines of defense of China Power Grid mainly solve the low-frequency problem of the system through the control measures of centralized removal of 110kV and 35kV load lines in substations through the safety and stability control system and low-frequency load shedding device. The existing load emergency control objects have a large granularity, and all the loads on the removed 110kV and 35kV lines will be cut off, which will bring great losses to the national economy and people's production and life. After the measures are implemented, the unbalanced capacity will be large. Small-scale grids create new stability problems. On the other hand, the number of load shedding execution ...

AI Technical Summary

Problems solved by technology

The existing load emergency control objects have a large granularity, and all the loads on the removed 110kV and 35kV lines will be cut off, which will bring great losses to the national economy and people's production and life. After the measures are implemented, the unbalanced capacity will be large. Small-Scale Grids Create New Stability Issues

On the other hand, the number of load shedding execution stations connected to the existing safety and stability control system is limited. At present, the control master station can be connected to a maximum of 100, which cannot meet the needs of large-scale decentralized and interruptible load stations.

At present, the low-frequency load shedding device also takes the 110kV and 35kV load lines collected locally as the single control object, and the low-frequency load shedding and load shedding cannot accurately distinguish between a large number of interruptible loads and uninterruptible load branch circuits on the removed line. The frequency response of the ground, the measures are independent of each other, it is difficult to coordinate, and the control capacity cannot be counted, which will cause large-scale power outage losses

[0003] The objects of load emergency control are 110kV and 35kV load lines collected locally by substations, which cannot satisfy the access of large-scale scattered interruptible load sites, and cannot accurately distinguish a large number of interruptible loads and non-interruptible load branch circuits on the removed lines. The large post-unbalanced capacity will cause large-scale power outage losses, which needs to be solved urgently

Images