Measuring method and online monitoring system for reactive current compensation rate of generator set

Abstract

The invention discloses a measuring method and online monitoring system for the reactive current compensation rate of a generator set. Traditional measurement methods may interfere with the normal operation of the generator set, have a certain test risk, is incapable of achieving nonintrusive undisturbed measurement, and cannot be used for continuously online monitoring the reactive current compensation rate of the generator set. The measuring method of the invention comprises steps of: monitoring the grid-connected running state of the generator set, and determining whether the generator setis in a undisturbed stable operation state; measuring the electric quantity and the control variable of the generator set at the same stable operation time; calculating the per-unit values of the electrical quantity and the control variable of the generator set by using the nominal parameters and the reference value of the generator set; calculating the excitation control open-loop steady-state gain according to the open-loop transfer function of the generator set excitation control system; and calculating the reactive current compensation rate of the generator set according to a reactive current compensation rate calculation formula. The method realizes the nonintrusive undisturbed measurement of the reactive current compensation rate of the generator set, and provides a solution for thefast check of the reactive current compensation coefficient of the generator set and the online monitoring of the reactive current compensation rate.

Description

technical field [0001] The invention belongs to the technical field of generator set reactive current compensation, in particular to a method for measuring the reactive current compensation rate of a generator set and an online monitoring system. Background technique [0002] The reactive current compensator (also known as the difference adjustment link) is one of the important auxiliary loops in the automatic excitation regulator (AVR), which is used to compensate the reactive power loss of the step-up transformer of the unit generating set or for the direct parallel connection of the machine end. The reactive power and voltage between them run stably. With the rapid development of large-scale UHVDC operation and the high penetration rate of new energy power generation, the problem of reactive power and voltage stability has emerged in some areas. ability. Therefore, it is necessary to check and monitor the reactive current compensator of the generating set in order to ma...

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Problems solved by technology

However, the above methods will interfere with the normal operation of the unit, and there is a certain risk in the test. It cannot be used for non-intrusive and undisturbed measurement, and cannot be used for continuous online monitoring of the reactive current compensation rate of the generator set.

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