Method for online identification of parameters of reactive compensation capacitor bank

Abstract

The invention discloses a method for online identification of parameters of a reactive compensation capacitor bank and belongs to the technical field of electric element online monitoring. The method comprises the steps that three-phase voltages and three-phase currents of the reactive compensation capacitor bank at different moments are measured; data are processed, so that sequence components of three-phase voltage fundamental wave phasors and sequence components of three-phase current fundamental wave phasors of the reactive compensation capacitor bank at each moment are obtained and sequence components of three-phase voltage each-time harmonic wave phasors and sequence components of three-phase current each-time harmonic wave phasors are obtained; a positive-sequence component of the voltage fundamental wave phasor of any phase and a positive-sequence component of the current fundamental wave phasor of the same phase at each moment are selected, and the sequence component with the larger content of the voltage each-time harmonic wave phasor of any phase and the sequence component with the larger content of the current each-time harmonic wave phasor of the same phase at each moment are selected; the equivalent resistance value, the capacitance value and the inductance value of an electric reactor of the reactive compensation capacitor bank are calculated through the selected data. According to the method, under the circumstances that a capacitor is not stopped and a connection wire of the capacitor is not detached, online identification of the parameters of the capacitor bank is achieved, and the measurement workload is relieved.

Description

technical field [0001] The invention belongs to the technical field of on-line monitoring of electric power components in a power system, and in particular relates to an on-line parameter identification method of a reactive power compensation capacitor bank. Background technique [0002] The power system provides reactive power compensation to the system through parallel capacitor banks to increase node voltage and reduce line loss. At the same time, in order to limit the closing inrush current and play a certain role in filtering harmonics, a reactor with a certain reactance rate is often connected in series in the capacitor bank. Such as figure 1 As shown, three-phase parallel capacitor banks connected in star connection and delta connection respectively. [0003] The normal operation of the capacitor bank is very important to the safety and stability of the power system. Therefore, it is generally arranged to carry out preventive tests every year to check whether the pa...

AI Technical Summary

Problems solved by technology

At present, there is also a special power capacitor capacitance tester, which does not need to remove the connecting wire of the capacitor when measuring, but it also needs to be tested with a power failure and a signal.

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