Low-frequency and low-voltage load reduction system based on distributed hierarchical control framework

Abstract

The invention discloses a low-frequency and low-voltage load reduction system based on a distributed hierarchical control framework. The low-frequency and low-voltage load reduction system comprises at least two execution child stations and a master station, and the execution child stations and the master station communicate in a two-way manner. All the execution child stations are low-frequency and low-voltage load reduction devices arranged in a substation. When the low-frequency and low-voltage load reduction devices detect that the frequency or voltage of a line is lower than a set value, the load of a corresponding round is shed. The master station is composed of an acquisition server and a workstation, wherein the acquisition server counts the low-frequency and low-voltage load shedding capacity sent by the execution child stations and sends the counting result to the workstation for processing, and the workstation sends low-frequency and low-voltage load shedding indicators to the execution child stations through the acquisition server. The dynamic characteristics of the system can be accurately grasped, electrical safety accidents can be avoided, and accurate shedding of load is achieved.

Description

Technical field [0001] The invention belongs to the technical field of power equipment of a substation and distribution network, in particular to a low-frequency and low-voltage load reduction system based on a distributed hierarchical control framework. Background technique [0002] The low-frequency and low-voltage load shedding system is to restore the frequency or voltage of the power grid to the rated value by removing the load when the frequency or voltage of the power grid is lower than the rated value. It is to improve the safety and stability of the power system, prevent grid stability accidents, and prevent large-scale blackouts. key. The current low-frequency and low-voltage load shedding system is basically a single device based on each substation, and only depends on the local frequency or voltage drop to trigger the device action. The device's action logic cannot involve remote information and cannot accurately grasp the whole The dynamic characteristics of the sys...

AI Technical Summary

Problems solved by technology

The current low-frequency and low-voltage load shedding system is basically a single device based on each substation, and only depends on the local frequency or voltage drop to trigger the device's action. The remote information cannot be involved in the device's action logic, and it is impossible to accurately grasp the entire situation. Due to the dynamic characteristics of the system, it is even more difficult to measure the effect of the load shedding measures of the substation on the stability requirements of the large-scale regional power grid; and once the load shedding control strategy is set, it will not change with the actual working conditions

Therefore, the traditional safety and stability control device cannot respond to the dynamic situation of the system in a timely and correct manner, and it is difficult to meet the requirements of the coordinated control of the large power grid.

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