Insulation resistance estimation device and estimation method
A technology of insulation resistance and series resistance, which is applied to insulation resistance estimation devices and estimation fields, and can solve problems such as insulation resistance estimation errors
Active Publication Date: 2014-12-31
IND TECH RES INST
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Based on this, it can be seen that the known previous proposals all rely on the waveform changes of the RC curve to estimate the insulation resistance value, ignoring the fact that parasitic or stray capacitance will have a considerable impact on the dynamic square wave signal, resulting in considerable errors in the insulation resistance estimation.
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[0064] The technical means and effects used by the present invention to achieve the purpose will be described below with reference to the accompanying drawings, and the embodiments listed in the following drawings are only auxiliary descriptions, to facilitate the understanding of those skilled in the art, but the technology of the present application The means are not limited to the enumerated drawings.
[0065] see figure 2 As shown, the insulation resistance estimation device 20 provided by the present invention includes a step-down power converter (Buck converter) 21, a voltage measurement module 22, a control area network (CAN) transceiver 23, and a digital signal processor (DSP) 24 and a display unit 25 .
[0066] The insulation resistance estimating device 20 is connected to a high voltage power system 10, the high voltage power system 10 includes a frequency converter 11, a charger 12 and a battery pack 13, the frequency converter 11, the charger 12 and the battery p...
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An insulation resistance estimation device and an estimation method are provided. A voltage measuring module measures a noise voltage, a voltage between a negative electrode terminal of a high voltage power system and ground, and a positive electrode terminal voltage of the high voltage power system. The measurement results are sent to an insulation resistance equivalent circuit model, and then a parameter set is estimated by an adaptive estimation algorithm unit and is sent to the insulation resistance equivalent circuit model for calculation. The insulation resistance equivalent circuit model calculates the voltage between the negative electrode terminal of the high power system and ground by using the noise voltage, the voltage between the negative electrode terminal and ground, the positive electrode terminal voltage and the parameter set. The insulation resistance value of a positive electrode terminal virtual series resistance and a negative electrode terminal virtual series resistance is calculated by an insulation resistance calculation unit.
Description
technical field [0001] The present invention relates to an insulation impedance estimation device and estimation method, in particular to an insulation impedance estimation device and estimation method that adopts a complete equivalent circuit model and uses an adaptive estimation method, which can eliminate stray capacitance effects and only It can estimate the shortcomings of the insulation resistance of the negative terminal of the large circuit and the casing during the operation of the system, and improve the accuracy and reliability of the insulation resistance estimation. Background technique [0002] see figure 1 A structure of a known high-voltage power system is shown, the high-voltage power system 10 includes a frequency converter 11, a charger 12 and a battery pack 13, and the frequency converter 11, charger 12 and battery pack 13 are arranged in a casing 14 Inside, the frequency converter 11 is electrically connected to a motor 15, the positive terminals of the...
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IPC IPC(8): G01R27/18
Inventor 江益贤施武阳柯嘉城
Owner IND TECH RES INST