Weak voltage transient stability node analysis method and device

Abstract

The invention discloses a weak voltage transient stability node analysis method and device. The method comprises the following steps: performing power grid transient stability simulation calculation on a bus branch model based on a power grid fault set; adopting a multi-binary table method to quantitatively calculate a transient voltage stability margin index of the bus to the fault; according to the severity of the faults, weighting the transient voltage stability margins under the condition that the buses respond to different faults by adopting a binomial coefficient method to obtain comprehensive transient voltage stability margins of a bus response fault set, and selecting the buses with relatively small margin values as weak nodes; and applying exciting voltage fluctuation to the generator set according to the most serious fault, observing voltage margin changes of weak nodes are observed, and thus, positioning the sensitive set. A binomial coefficient method is adopted to weight transient stability margins of a bus under different faults to obtain a comprehensive transient voltage stability margin of a bus response fault set, so that a relatively weak bus in a system is found, then excitation voltage fluctuation is set for a unit, and an optimal synchronous generator set is determined.

Description

technical field [0001] The invention belongs to the technical field of weak voltage transient analysis, and in particular relates to a weak voltage transient stable node analysis method and device. Background technique [0002] DC is fed into the AC grid at the receiving end. Since the DC operation needs to consume a large amount of reactive power, the bus voltage stability of the receiving end grid will be affected, which poses a challenge to the safe and stable operation of the grid. After DC feed-in, a large amount of reactive power will be consumed, which will affect the stability of the bus voltage of the power grid at the receiving end. In order to ensure the improvement of the stable operation level of the transient voltage of the power grid, and to provide technical support and theoretical guidance for improving the voltage stability and safe operation of the DC receiving-end power grid, it is necessary to determine the weak areas of voltage support in the receiving-...

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Problems solved by technology

The energy function method directly uses the energy function to estimate the transient stability, but its function construction and determination of the critical energy are difficult

At present, the practical criterion of the power system safety and stability calculation specification is mostly used in engineering practice: in the transient process after the power system is disturbed, the load bus voltage can recover to more than 0.8pu within 10s of the fault, but this The method can only determine whether the bus voltage is unstable, but cannot quantify the stability margin of the bus voltage, and it is difficult to evaluate the weak voltage area in the system

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