Method and system for calculating influence of excitation additional difference adjustment on synchronous torque of synchronous generator

Abstract

The invention discloses a method and system for calculating the influence of excitation additional difference adjustment on the synchronous torque of a synchronous generator. The method includes the following steps that: the Phillips-Heffron mathematical model of a single-machine infinite bus system is expanded, a difference adjustment model under additional difference adjustment is established; the oscillation frequency of the single-machine infinite bus system under no difference adjustment is solved according to the eigenvalue of the state equation set of the single-machine infinite bus system under no difference adjustment; the oscillation frequency of the single-machine infinite bus system under additional difference adjustment is solved according to the eigenvalue of the state equation set of the single-machine infinite bus system under additional difference adjustment; the synchronous torque coefficient KS of an excitation system under no additional difference adjustment ( a condition that Xc=0) is calculated according to the oscillation frequency of the single-machine infinite bus system under no difference adjustment; the value of the synchronous torque coefficient KS of the excitation system under additional difference adjustment (a condition that Xc is not equal to 0) is calculated according to the oscillation frequency of the single-machine infinite bus system underadditional difference adjustment; and the difference value of the synchronous torque coefficient KS of the excitation system under no additional difference adjustment (the condition that Xc is equalto 0) and the synchronous torque coefficient KS of the excitation system under additional difference adjustment (the condition that Xc is not equal to 0) is obtained by means of comparison.

Description

technical field [0001] The present invention relates to the technical field of electric power systems, and more specifically, to a method and system for calculating the influence of excitation additional adjustment on the synchronous torque of a synchronous generator. Background technique [0002] With the development of UHV AC and DC large-scale interconnected power systems, the safe and stable operation of power systems is becoming increasingly important. The generator excitation system plays a very significant role in ensuring the stability of system voltage and reactive power. Most of the large power plants now use generator-transformer wiring, and the high-voltage side of the main transformer is connected in parallel to the same busbar. Therefore, if the excitation voltage of a unit in the same power plant changes, it will not only change the reactive power and voltage of the unit, but also affect the reactive power of other parallel operating units, thereby causing ch...

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Problems solved by technology

[0005] The technical solution of the present invention provides a method and system for calculating the influence of the additional excitation adjustment on the synchronous torque of the synchronous generator to solve the problem of how to calculate the influence of the additional excitation adjustment on the synchronous torque of the synchronous generator

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