A Quantitative Detection and Qualitative Identification Method of Passive Component Parameters in Non-sinusoidal AC Circuits

Abstract

The invention discloses a quantitative determination and qualitative identification method of passive element parameters in a non-sine AC circuit. The method mainly involves the following content: based on an expanded Ohm law in the non-sine AC circuit, through expanding instantaneous voltage and instantaneous current signals to analysis signals and defining instantaneous resistance and instantaneous reactance, parameters of linear resistor, linear reactor and linear capacitor elements can be quantitatively calculated in the non-sine AC circuit directly according to instantaneous reactance; through defining correlation coefficients and nonlinearity of the instantaneous reactance, nonlinear elements in the circuit are identified, accurate and direct calculation of linear resistor element parameters, linear inductor element parameters and linear capacitor element parameters in a sine AC circuit and the non-sine AC circuit can be realized, an effective means is provided for online or offline detection of linear element parameters, and the control effect of a correlation controller is improved; and at the same time, the nonlinear elements in the sine AC circuit and the non-sine AC circuit can be qualitatively distinguished, and an effective means is provided for identification of a harmonic source and the like.

Description

technical field [0001] The invention relates to the field of AC circuits including sinusoidal AC circuits and non-sinusoidal AC circuits, in particular to a method for quantitative detection and qualitative identification of passive component parameters in non-sinusoidal AC circuits. Background technique [0002] In various circuits, voltage, current, impedance, and admittance are time-varying. In the sinusoidal AC circuit theory, instantaneous voltage, instantaneous current, instantaneous power, instantaneous active power, and instantaneous reactive power are defined. Due to the reasonable definition, these parameters can be accurately measured or obtained through calculation, and, therefore, have achieved good application results in practice. However, in practice, it is usually necessary to accurately obtain the instantaneous resistance, instantaneous reactance, instantaneous conductance and instantaneous susceptance to realize the control of power electronic devices, the...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the linear component parameters in the existing non-sinusoidal AC circuit can only be approximated indirectly, and the harmonic amplification effect shown by the linear inductance and linear capacitance affects the effective identification of nonlinear components, providing A method for quantitative detection and qualitative identification of passive component parameters in non-sinusoidal AC circuits. Direct and accurate calculation of linear capacitance and accurate and effective identification of nonlinear components

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