A method and device for judging voltage instability in a load substation

Abstract

The present invention provides a load substation voltage instability judgment method and device, which firstly calculates the power transfer voltage drop coefficient between the DC system's commutation busbar and the load substation's high-voltage side busbar, and then preliminarily judges the voltage stability of the load substation, Finally, whether it is necessary to check the voltage stability of the load substation according to the proportion of different loads in the load substation, and simulate through the power system simulation software, and then realize the judgment of whether the voltage instability of the load substation occurs according to the simulation results. The technical solution provided by the present invention does not need to carry out simulation calculations for various fault situations that may occur in all DC systems, but based on the power transfer voltage drop coefficient and the proportion of different loads in the load substation, the faults with hidden dangers in voltage stability and The load substation performs targeted verification and simulation to provide guidance for the safe and stable operation of the power grid, reducing the workload of safety and stability verification of the AC-DC hybrid power grid.

Description

technical field [0001] The invention relates to the technical field of power system safety and stability, in particular to a method and device for judging voltage instability in a load substation. Background technique [0002] China has a vast territory and the distribution of energy and load demand is asymmetrical. The southwest region has abundant water resources, and the northwest region has sufficient resources such as coal, wind energy, and solar energy. However, the load demand is mainly distributed in the economically developed areas along the eastern coast. Due to the above-mentioned energy The characteristics of distribution and load make long-distance and large-capacity power transmission very necessary. [0003] UHV DC is a major way of long-distance and large-capacity power transmission. However, when a blocking fault occurs in the DC system, there is a power shortage in the receiving power grid, and the power flow is transferred to each load point on a large sca...

AI Technical Summary

Problems solved by technology

[0011] In order to overcome the deficiency that the static voltage stability analysis method in the prior art cannot determine the specific fault form that may cause voltage instability and cannot distinguish the voltage stability margin variation of different AC buses under different fault forms, the present invention provides a load Substation voltage instability judgment method and device, based on the power transfer voltage drop coefficient between the converter bus of different DC systems and the high-voltage side bus of the load substation, preliminarily judges the voltage stability of the load substation, and combines the proportion of different loads in the load substation Whether it is necessary to check the voltage stability of the load substation, and simulate it through the power system simulation software, and then judge whether the load substation has voltage instability according to the simulation results, and provide guidance for the safe and stable operation of the power grid

Images