Industrial isolated network frequency adjusting method, device and system

Abstract

The invention discloses an industrial isolated network frequency adjusting method, device and system. The method comprises: calculating the unit adjusting power of an isolated network system; acquiring the real-time power grid frequency of the isolated network system; when the real-time frequency change rate of the isolated network system is smaller than a set threshold value and the real-time power grid frequency of the isolated network system is within a preset adjustment interval, calculating the power unbalance amount of the isolated network system based on the unit adjustment power and the real-time power grid frequency; and comparing the power unbalance amount of the isolated network system with the primary frequency modulation capability of the generator set, and sending adjustmentcontrol information to various types of power supplies and adjustable loads in the isolated network system based on a comparison result to complete frequency adjustment of the isolated network system.According to the method, the adjustable load and multiple types of power supplies are fully mobilized to participate in system frequency adjustment, and for non-monitoring faults, when the system frequency drops or rises to a preset interval, the load and the unit side output are adjusted according to the calculated control quantity, so that the system frequency recovery is accelerated.

Description

technical field [0001] The invention belongs to the technical field of frequency adjustment, and in particular relates to an industrial isolated network frequency adjustment method, device and system. Background technique [0002] Due to various factors such as economics and history, there are still many weak industrial enterprise power grids in my country with only one or two communication channels weakly connected or operating independently with the main grid. When Chinese enterprises invest in the third world, due to the weak local infrastructure, the power grids built by industrial enterprises have to operate independently. The power grid of such industrial enterprises has a weak ability to withstand power grid disturbances, but most of the industrial loads produced are primary and secondary loads that interrupt power supply, which will cause large economic losses and even personal casualties. Not all security and stability control methods and experiences are applicable...

AI Technical Summary

Problems solved by technology

[0004] The grid structure of the industrial isolated grid is complex. Due to cost considerations, the emergency control system cannot monitor all sites. Take control measures in time, the frequency of the isolated grid system will fluctuate significantly and even trigger low-frequency load shedding or high-frequency machine cut-off

However, the general system inertia of the power grid of industrial enterprises is small, and the action granularity of low-frequency load shedding and high-frequency cut-off is large, so it is easy to occur low-frequency load shedding and over-cutting. In the vicious cycle of load, not only is it easy to lead to further expansion of the accident, but it is more likely to cause the isolated grid system to lose power and collapse the grid, resulting in huge economic losses

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