An intelligent low-frequency and low-voltage load shedding method for power systems based on smart home appliances

Abstract

The invention relates to a power system intelligent low-frequency low-voltage load reduction method based on an intelligent household electrical appliance. The method comprises the following steps: when large disturbance in a system is monitored, determining whether the frequency and the voltages of the system are decreased to preset load reduction motion values, and once the frequency and the voltages reach the load reduction motion values, obtaining power shortage in the system and determining a load capacity which should be cut from the system; starting an intelligent household electrical appliance load reduction module; starting low-frequency low-voltage load reduction; and if intelligent household electrical appliance load reduction cannot enable the system frequency and voltages to restore to normal operation scopes and the frequency and voltages are continuously decreased to preset values of the low-frequency low-voltage load reduction, starting the low-frequency low-voltage load reduction, according to a residual load reduction amount, successively starting a basic round and a special round of low-frequency load reduction for cutting off loads until the frequency is restored to the normal operation scope, and embedding one low-voltage load reduction module in each round of low-frequency load cutting. According to the invention, after a power system is disturbed, the frequency and voltages can be effectively and rapidly inhibited from dropping and even collapsing, the load cutting amount is small, and the economic loss is small.

Description

technical field [0001] The invention belongs to the technical field of power systems, and relates to a low-frequency and low-voltage load shedding method. Background technique [0002] Low-frequency and low-voltage load shedding is the last line of defense to ensure the safe and stable operation of the power system. It is an effective control method to maintain the power balance of the power grid and prevent the frequency and voltage of the power system from falling sharply. In recent years, the scale of the power system has continued to expand, and the network architecture has become more and more complex. The safety and reliability of the power system power supply is also facing great challenges. The existing traditional low-frequency and low-voltage load shedding method cuts off the load when the frequency and voltage of the power system drop to a preset value, which is prone to over-cutting or under-cutting, resulting in economic losses; at the same time, the power suppl...

AI Technical Summary

Problems solved by technology

In recent years, the scale of the power system has continued to expand, and the network architecture has become more and more complex. The safety and reliability of the power supply of the power system is also facing great challenges.

The existing traditional low-frequency and low-voltage load shedding method cuts off the load when the frequency and voltage of the power system drop to a preset value, which is prone to over-cutting or under-cutting, resulting in economic losses; at the same time, the power supply to the load-shedding line is forced to stop, regardless of power consumption The participation and initiative of users affect the quality of life of users and cannot meet the needs of the power grid.

Images