CN115856437A - Method for detecting insulation impedance of high-voltage energy storage battery - Google Patents
Method for detecting insulation impedance of high-voltage energy storage battery Download PDFInfo
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Abstract
The invention relates to a method for detecting insulation impedance of a high-voltage energy storage battery, which comprises the following steps of S1, constructing an error balance model of a divider resistor of an electrode of the high-voltage energy storage battery; s2, counting a voltage value measured by an analog-to-digital converter end of the high-voltage energy storage battery electrode divider resistor, calculating the equivalent impedance of the battery electrode to the protection grounding wire according to the voltage value measured by the analog-to-digital converter end, and recalculating the equivalent impedance of the battery electrode to the protection grounding wire according to the product of an error balance model and the originally calculated equivalent impedance of the battery electrode to the protection grounding wire; s3, circulating the step S2 to train the error balance model; and S4, carrying out actual calculation and modification on the equivalent impedance of the battery electrode pair to the protective grounding wire by using a trained error balance model. The calculation result is more accurate than the equivalent impedance of the battery electrode to the protective grounding wire in the prior art.
Description
Technical Field
The invention relates to a method for detecting insulation impedance of a high-voltage energy storage battery.
Background
The common insulation resistance detection can be completed through an ohmmeter, the special insulation resistance detection technology of the high-voltage energy storage battery is less, the prior art is also less described, and the related technology is, for example, patent document CN104569598a, a nondestructive detection circuit and a nondestructive detection method for the insulation resistance of a high-voltage battery energy storage system, wherein the circuit comprises a resistance network, a voltage test differential amplification circuit, a high-frequency filter circuit, a signal isolation circuit, an AD conversion circuit and a data processing unit which are sequentially connected. The technical scheme is used for detecting the anode ground fault and the cathode ground fault of the energy storage battery system, and the calculation principle comprises the following steps: the battery high-voltage divider resistance network consists of resistors R1 and R2 and high-voltage switches Kp and Kn, resistance values of the resistors R1 and R2 of the battery high-voltage divider resistance network are calculated through the resistors in the voltage test differential amplification circuit, specifically, the resistance values of the resistors R1 and R2 are calculated together according to the gain relation of the signal processing circuit and the isolation circuit and the voltage value measured by the last end analog-to-digital converter of the battery electrode divider resistance, and on the basis, the equivalent impedance of the battery electrode to the protection grounding wire can be calculated.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a method for detecting the insulation impedance of a high-voltage energy storage battery.
The technical scheme adopted by the invention for solving the technical problems is as follows:
s1, constructing an error balance model of a divider resistor of an electrode of the high-voltage energy storage battery; s2, counting a voltage value measured by an analog-to-digital converter end of the high-voltage energy storage battery electrode divider resistor, calculating the equivalent impedance of the battery electrode to the protection grounding wire according to the voltage value measured by the analog-to-digital converter end, and recalculating the equivalent impedance of the battery electrode to the protection grounding wire according to the product of an error balance model and the originally calculated equivalent impedance of the battery electrode to the protection grounding wire; s3, circulating the step S2 to train the error balance model; and S4, carrying out actual calculation and modification on the equivalent impedance of the battery electrode to the protective grounding wire by using a trained error balance model.
Further, the error balance model is specifically TR1 (xAD)/TR 2 (xAD) ((TC (xAD)) -1 )*（TZ（xAD）） -1 The xAD is specifically a voltage value measured at the analog-to-digital converter end, TR1 (xAD) and TR2 (xAD) are specifically resistance scale error regression functions, TC (xAD) is specifically a measured error regression function, and TZ (xAD) is specifically a gain scale error regression function.
Further, the TR1 (xAD) = e (-a1*xAD) *sin(w1*b1*xAD)/(w1*xAD-n) 2 (ii) a TR2 (xAD) = e (-a2*xAD) *sin(w2*b2*xAD)/(w2*xAD-n) 2 (ii) a Wherein xAD is specifically a voltage value measured at an analog-to-digital converter end, a1, a2, b1, b2, n are constants, and w1, w2 are time parameters.
Further, the TC (xAD) = - (a 1+ a 2)/(n xAD ((1-lnxAD 2) 2 ) 1/2 ) (ii) a Wherein xAD is specifically a voltage value measured at an analog-to-digital converter end, and a1, a2 and n are constants.
Further, the TZ (xAD) = ((a 1-a 2) 2 ) 1/2 /(-(a1+a2)*n*xAD*((1-ln(xAD) 2 ) 2 ) 1/2 ) (ii) a Wherein xAD is specifically a voltage value measured at the analog-to-digital converter end, and a1, a2 and n are constants.
Further, the actual calculation and modification of the equivalent impedance of the battery electrode to the protection ground wire by using the trained and matured error balance model is specifically that when the voltage value measured at the analog-to-digital converter end of the high-voltage energy storage battery electrode divider resistor is xAD, and the equivalent impedance of the battery electrode to the protection ground wire is calculated as R (xAD) by using the voltage value measured at the analog-to-digital converter end, the actual calculation and modification of the equivalent impedance of the battery electrode to the protection ground wire by using the trained and matured error balance model is specifically that R (xAD) is calculated as follows: r (xAD) = R (xAD) × TR1 (xAD)/TR 2 (xAD) ((TC) ((xAD1）） -1 )*（TZ（xAD1）） -1 R (xAD 2) is the actual calculation result of the equivalent impedance of the battery electrode to the protection ground line after the modification.
Advantageous effects
According to the method, the equivalent impedance of the battery electrode pair protection grounding wire is recalculated by taking the product of the error balance model and the originally calculated equivalent impedance of the battery electrode pair protection grounding wire, and the actual calculation and modification of the equivalent impedance of the battery electrode pair protection grounding wire are performed by the trained error balance model, so that the calculation result after modification is more accurate than the calculated equivalent impedance of the battery electrode pair protection grounding wire in the prior art.
Drawings
Fig. 1 is a flowchart of a method for detecting insulation resistance of a high-voltage energy storage battery according to the present application.
Detailed Description
In the implementation of the method for detecting the insulation resistance of the high-voltage energy storage battery, as shown in fig. 1, the method comprises the following steps: s1, constructing an error balance model of a high-voltage energy storage battery electrode divider resistor; s2, counting a voltage value measured by an analog-to-digital converter end of the high-voltage energy storage battery electrode divider resistor, calculating the equivalent impedance of the battery electrode to the protection grounding wire according to the voltage value measured by the analog-to-digital converter end, and recalculating the equivalent impedance of the battery electrode to the protection grounding wire according to the product of an error balance model and the originally calculated equivalent impedance of the battery electrode to the protection grounding wire; s3, circulating the step S2 to train the error balance model; and S4, carrying out actual calculation and modification on the equivalent impedance of the battery electrode pair to the protective grounding wire by using a trained error balance model.
Preferably, the error balance model is, in particular, TR1 (xAD)/TR 2 (xAD) ((TC (xAD)) -1 )*（TZ（xAD）） -1 The xAD is specifically a voltage value measured at the analog-to-digital converter end, TR1 (xAD) and TR2 (xAD) are specifically resistance scale error regression functions, TC (xAD) is specifically a measured error regression function, and TZ (xAD) is specifically a gain scale error regression function.
Preferably, the TR1 (xAD) = e (-a1*xAD) *sin(w1*b1*xAD)/(w1*xAD-n) 2 (ii) a The TR2 (xAD) = e (-a2*xAD) *sin(w2*b2*xAD)/(w2*xAD-n) 2 (ii) a Wherein xAD is specifically a voltage value measured at the analog-to-digital converter end, and both are constants, and w1 and w2 are time parameters.
Preferably, the TC (xAD) = - (a 1+ a 2)/(n xAD ((1-lnxAD 2) 2 ) 1/2 ) (ii) a Wherein xAD is specifically a voltage value measured at the analog-to-digital converter end, and a1, a2 and n are constants.
Preferably, said TZ (xAD) = ((a 1-a 2) 2 ) 1/2 /(-(a1+a2)*n*xAD*((1-ln(xAD) 2 ) 2 ) 1/2 ) (ii) a Wherein xAD is specifically a voltage value measured at an analog-to-digital converter end, and a1, a2 and n are constants.
Preferably, the actual calculation and modification of the equivalent impedance of the battery electrode pair to the protection ground wire by using the trained and matured error balance model is specifically, when the voltage value measured at the analog-to-digital converter end of the high-voltage energy storage battery electrode divider resistor is xAD, and the equivalent impedance of the battery electrode pair to the protection ground wire is R (xAD) by using the voltage value measured at the analog-to-digital converter end, the actual calculation and modification of the equivalent impedance of the battery electrode pair to the protection ground wire by using the trained and matured error balance model is specifically to calculate R (xAD) as follows:
R（xAD2）=R（xAD1）*TR1（xAD1）/TR2（xAD1）*(（TC（xAD1）） -1 )*（TZ（xAD1）） -1 r (xAD 2) is the actual calculation result of the equivalent impedance of the battery electrode to the protection ground line after the modification.
In a specific implementation, the method for detecting the insulation resistance of the high-voltage energy storage battery comprises the following steps: s1, constructing an error balance model of a high-voltage energy storage battery electrode divider resistor; the error-balancing model is specifically a model of,
TR1（xAD）/TR2（xAD）*(（TC（xAD）） -1 )*（TZ（xAD）） -1 ；
TR1（xAD）=e (-a1*xAD) *sin(w1*b1*xAD)/(w1*xAD-n) 2 ；
the TR2 (xAD) = e (-a2*xAD) *sin(w2*b2*xAD)/(w2*xAD-n) 2 ；
The TC (xAD) = - (a 1+ a 2)/(n xAD ((1-lnxAD 2) 2 ) 1/2 )；
The TZ (xAD) = ((a 1-a 2) 2 ) 1/2 /(-(a1+a2)*n*xAD*((1-ln(xAD) 2 ) 2 ) 1/2 )；
Wherein xAD is specifically a voltage value measured at an analog-to-digital converter end, TR1 (xAD) and TR2 (xAD) are specifically resistance scale error regression functions, TC (xAD) is specifically a measured error regression function, and TZ (xAD) is specifically a gain scale error regression function;
s2, counting a voltage value measured by an analog-to-digital converter end of the high-voltage energy storage battery electrode divider resistor, calculating the equivalent impedance of the battery electrode to the protection grounding wire according to the voltage value measured by the analog-to-digital converter end, and recalculating the equivalent impedance of the battery electrode to the protection grounding wire according to the product of an error balance model and the originally calculated equivalent impedance of the battery electrode to the protection grounding wire;
s3, training the error balance model in a circulating S2 step, wherein the product of the calculated error balance model and the originally calculated equivalent impedance of the battery electrode pair protection grounding wire is enabled to be as close to the real value of the equivalent impedance of the battery electrode pair protection grounding wire as possible in the training; the numerical values of a1, a2, b1, b2 and n can be modified during training;
s4, carrying out actual calculation and modification on the equivalent impedance of the battery electrode to the protection ground wire by using a trained and mature error balance model, wherein when the voltage value measured by an analog-to-digital converter end of the high-voltage energy storage battery electrode divider resistor is xAD, and the voltage value measured by the analog-to-digital converter end is used for calculating the equivalent impedance of the battery electrode to the protection ground wire to be R (xAD), the actual calculation and modification on the equivalent impedance of the battery electrode to the protection ground wire by using the trained and mature error balance model is specifically to calculate the R (xAD) as follows:
R（xAD2）=R（xAD1）*TR1（xAD1）/TR2（xAD1）*(（TC（xAD1）） -1 )*（TZ（xAD1）） -1 r (xAD 2) is the actual calculation result of the equivalent impedance of the battery electrode to the protection ground line after the modification.
In the implementation of the method, the equivalent impedance of the battery electrode pair protection grounding wire is recalculated by taking the product of the error balance model and the originally calculated equivalent impedance of the battery electrode pair protection grounding wire, and the actual calculation and modification of the equivalent impedance of the battery electrode pair protection grounding wire are performed by using the trained error balance model.
Claims (6)
1. A method for detecting insulation impedance of a high-voltage energy storage battery is characterized by comprising the following steps of S1, constructing an error balance model of a divider resistor of an electrode of the high-voltage energy storage battery; s2, counting a voltage value measured by an analog-to-digital converter end of the high-voltage energy storage battery electrode divider resistor, calculating the equivalent impedance of the battery electrode to the protection grounding wire according to the voltage value measured by the analog-to-digital converter end, and recalculating the equivalent impedance of the battery electrode to the protection grounding wire according to the product of an error balance model and the originally calculated equivalent impedance of the battery electrode to the protection grounding wire; s3, circulating the step S2 to train the error balance model; and S4, carrying out actual calculation and modification on the equivalent impedance of the battery electrode pair to the protective grounding wire by using a trained error balance model.
2. The method for detecting the insulation resistance of the high-voltage energy storage battery according to claim 1, wherein the error balance model is TR1 (xAD)/TR 2 (xAD) ((TC (xAD)) -1 )*（TZ（xAD）） -1 The xAD is specifically a voltage value measured at the analog-to-digital converter end, TR1 (xAD) and TR2 (xAD) are specifically resistance scale error regression functions, TC (xAD) is specifically a measured error regression function, and TZ (xAD) is specifically a gain scale error regression function.
3. The method for detecting the insulation resistance of the high-voltage energy storage battery according to claim 1, wherein the TR1 (xAD) = e (-a1*xAD) *sin(w1*b1*xAD)/(w1*xAD-n) 2 (ii) a TR2 (xAD) = e (-a2*xAD) *sin(w2*b2*xAD)/(w2*xAD-n) 2 (ii) a Wherein xAD is specifically a voltage value measured at the analog-to-digital converter end, and a1, a2, b1, b2 and n are all constantsW1 and w2 are time parameters.
4. The method for detecting the insulation resistance of the high-voltage energy storage battery according to claim 1, wherein the TC (xAD) = - (a 1+ a 2)/(n x xAD x ((1-lnxAD 2) 2 ) 1/2 ) (ii) a Wherein xAD is specifically a voltage value measured at the analog-to-digital converter end, and a1, a2 and n are constants.
5. The method for detecting the insulation impedance of the high-voltage energy storage battery as recited in claim 1, wherein the TZ (xAD) = ((a 1-a 2) 2 ) 1/2 /(-(a1+a2)*n*xAD*((1-ln(xAD) 2 ) 2 ) 1/2 ) (ii) a Wherein xAD is specifically a voltage value measured at the analog-to-digital converter end, and a1, a2 and n are constants.
6. The method for detecting the insulation impedance of the high-voltage energy storage battery according to claim 1, wherein the actual calculation and modification of the equivalent impedance of the battery electrode to the protection ground wire by training a mature error balance model specifically comprises the following steps: when the voltage value measured by the analog-to-digital converter end of the high-voltage energy storage battery electrode divider resistor is xAD, and the equivalent impedance of the battery electrode pair to the protection grounding wire is calculated to be R (xAD) according to the voltage value measured by the analog-to-digital converter end, the actual calculation modification of the equivalent impedance of the battery electrode pair to the protection grounding wire by training a mature error balance model is specifically to calculate R (xAD) as follows:
R（xAD2）=R（xAD1）*TR1（xAD1）/TR2（xAD1）*(（TC（xAD1）） -1 )*（TZ（xAD1）） -1 r (xAD 2) is the actual calculation result of the equivalent impedance of the battery electrode to the protection ground line after the modification.
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