Detection Method of Voltage and Reactive Power Sensitivity Based on Integral Mapping

Abstract

The invention discloses an integral-mapping-based voltage and reactive power sensitivity detection method, which comprises the following steps of performing simulation to obtain a key generatrix with a voltage recovery problem in a power grid; constructing a voltage and reactive power sensitivity model by taking the voltage of the key generatrix and the reactive power output of a generating set as objects; calculating incremental measured values of the voltage of the key generatrix and the reactive power output of the generating set of a power plant according to an integral mapping function; substituting the incremental measured values of the voltage of the key generatrix and the reactive power output of the generating set into the voltage and reactive power sensitivity model, and performing sensitivity solution to obtain the voltage and reactive power sensitivity of the power grid. According to the method, the voltage and reactive power sensitivity after system voltage drop is accurately detected to estimate the influence of the reactive power output of the generating set of each power plant on the voltage recovery of the key generatrix after disturbance, reflect the condition of contributes of excitation control of the adjacent power plants to the voltage recovery of the key generatrix after a failure occurs, compensate insufficient regional reactive power caused by the failure and alleviate the problem of slow voltage recovery of the key generatrix.

Description

technical field [0001] The invention relates to the technical field of power system voltage stability and generator reactive power control, in particular to a method for detecting voltage reactive power sensitivity based on integral mapping. Background technique [0002] my country's energy and economic distribution is extremely uneven. In order to meet the electricity demand in economically developed areas, some areas have developed into ultra-high voltage, long-distance, and large-capacity interconnected grids that operate in parallel with AC and DC. The receiving-end power grid has the characteristics of highly dense load, a high proportion of electricity sent from outside areas, and multiple DC centralized feed-in. The problem of reactive power and voltage of the receiving-end system is closely related to the problem of AC-DC interaction, intertwined with each other, and the stability characteristics are very complicated. [0003] As an important dynamic reactive power s...

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Problems solved by technology

[0006] Based on this, the present invention proposes a detection method of voltage reactive power sensitivity based on integral mapping, which can accurately detect the voltage reactive power sensitivity after the system voltage drops, and is used to evaluate the critical effect of reactive power output of generator sets in each power plant after the disturbance. The impact of bus voltage recovery can solve the problem of long voltage recovery time of key bus after faults assessed by the existing power grid

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