A method for evaluating the influence range of AC and DC dynamic interactive reactive power

Abstract

The invention discloses a method for evaluating the influence range of AC-DC dynamic interactive reactive power, comprising: 1. Simulating and calculating the minimum commutation bus voltage value; 2. Determining the range of influence of AC-DC interactive reactive power on the AC system; 3. Performance evaluation. The evaluation method proposed by the present invention combines the precise calculation of the Jacobian expansion matrix and the intuitive and effective electromagnetic transient programs PSCAD / EMTDC and RTDS, and realizes the fast and accurate judgment of the influence range of the reactive power impact of the DC system on the AC network. It provides a simple and efficient method for the impact boundary of dynamic interactive reactive power in the actual AC-DC interconnected power grid. It is helpful for system operators to grasp and evaluate the impact of DC reactive power impact on the AC system, improve the voltage support capacity of the AC network in a targeted manner, and reduce the It is of great significance to reduce the impact on the load of the power system and ensure the safe and stable operation of the AC-DC interconnected grid when the voltage caused by the DC system fault process deviates from the normal value area.

Description

technical field [0001] The present invention relates to power grid operation control technology, more specifically, relates to a method for evaluating the influence range of AC and DC dynamic interactive reactive power. Background technique [0002] With the development and application of high-voltage and UHV DC transmission technology, under the background of AC-DC interconnected large power grid, the complex dynamic reactive power between the AC system and the DC system will have a particularly prominent impact on the transient voltage stability of the entire power grid. The influence range of dynamic interactive reactive power on the AC side is of great significance to ensure the safe and stable operation of the power grid. The total reactive power demand of DC in the AC-DC hybrid power grid is very huge. The reactive power consumed by the DC system in normal operation accounts for about 40% to 60% of the active power delivered. If a fault occurs at the commutation bus of...

AI Technical Summary

Problems solved by technology

The total reactive power demand of DC in the AC-DC hybrid power grid is very huge. The reactive power consumed by the DC system in normal operation accounts for about 40% to 60% of the active power delivered. If a fault occurs at the commutation bus of the DC system , the sharp drop in voltage causes the reactive power compensation device of the inverter station to fail to provide sufficient reactive power, and needs to absorb a large amount of reactive power from the AC grid, which may destroy the dynamic balance of reactive power in the power network, and eventually lead to voltage instability , have an important impact on the safe and stable operation of the power grid

[0003] At present, the influence range of dynamic interactive reactive power in AC and DC systems is mainly concentrated on the concentration and equivalent value of a large number of scattered loads, but there is no complete and systematic method for the evaluation of the range of dynamic interactive reactive power in AC and DC systems.

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