CN111948504A - 800V energy storage system insulation detection circuit and method - Google Patents
800V energy storage system insulation detection circuit and method Download PDFInfo
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- CN111948504A CN111948504A CN202010868229.2A CN202010868229A CN111948504A CN 111948504 A CN111948504 A CN 111948504A CN 202010868229 A CN202010868229 A CN 202010868229A CN 111948504 A CN111948504 A CN 111948504A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
Abstract
The invention discloses an insulation detection circuit and method for an 800V energy storage system, which comprises a power supply, resistors R0, R1, R2, R3, R4, Rp, Rn and a voltage source Us, wherein the resistors R0, R1, R2, R3, R4, Rp and Rn are connected with the power supply; one end of R1 is connected with the positive pole of the power supply through a switch S2, the other end is connected with R2, and the end of R2 far away from R1 is connected with the negative pole of the power supply through a switch S3; one end of the R3 is connected with the positive electrode of the power supply through a switch S4, the other end of the R3 is connected with the R4, and one end of the resistor R4, which is far away from the resistor R3, is connected with the negative electrode of the power supply through a switch S5; one end of the resistor Rp is connected with the positive electrode of the power supply, the other end of the resistor Rp is connected with the resistor Rn, and one end, far away from the resistor Rp, of the resistor Rn is connected with the negative electrode of the power supply; the common end of the resistor R1 and the resistor R2, the common end of the resistor R3 and the resistor R4, and the common end of the resistor Rp and the resistor Rn are connected with each other; one end of the resistor R0 is connected with the common ends of the resistor R1 and the resistor R2 through a switch S0, and the other end of the resistor R0 is connected with the common end of the resistor Rp and the resistor Rn after being connected with a voltage source Us in series. The invention can meet the precision requirement and carry out primary positioning on system faults and component faults.
Description
Technical Field
The invention belongs to the field of new energy automobiles, and particularly relates to an insulation detection circuit and method for an 800V energy storage system.
Background
The passenger is in direct contact with the vehicle body ground, which is isolated from the high-voltage battery circuit, in order to prevent electric shock to the person. However, due to aging, harsh use environment and other factors, the high-voltage battery circuit may form a leakage circuit to the vehicle body ground, which is harmful to personal safety, and thus the BMS is required to monitor the insulation between the high-voltage battery and the vehicle body ground in real time. The GBT 18384.1-2015 national standard insulation detection method measures the bus-to-ground resistance of an ungrounded system in a bridge passive direct current mode, stray capacitance is not considered to be coupled with changed resistance, and the large stray capacitance can cause the method in the national standard to be invalid; the equivalent internal resistance is present, and the actual insulation of the whole automobile can be reduced; insulation failure cannot be accurately positioned; the measuring time is longer; and the self-diagnosis function of the detection circuit is not provided.
Disclosure of Invention
The invention aims to solve the technical problem of providing an insulation detection circuit and method for an 800V energy storage system aiming at the defects of the background art, which can quickly measure the ground resistance of a high-voltage system, meet the precision requirement and carry out primary positioning on system faults and component faults.
The invention adopts the following technical scheme for solving the technical problems:
an insulation detection circuit of an 800V energy storage system comprises a power supply, a resistor R0, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor Rp, a resistor Rn, a voltage source Us, a switch S0, a switch S1, a switch S2, a switch S3, a switch S4 and a switch S5;
one end of the resistor R1 is connected with the positive electrode of the power supply through a switch S2, the other end of the resistor R2 is connected with the resistor R2, and one end of the resistor R2, which is far away from the resistor R1, is connected with the negative electrode of the power supply through a switch S3;
one end of the resistor R3 is connected with the positive electrode of the power supply through a switch S4, the other end of the resistor R4, and one end of the resistor R4, which is far away from the resistor R3, is connected with the negative electrode of the power supply through a switch S5;
one end of the resistor Rp is connected with the positive electrode of the power supply, the other end of the resistor Rp is connected with the resistor Rn, and one end, far away from the resistor Rp, of the resistor Rn is connected with the negative electrode of the power supply;
the common end of the resistor R1 and the resistor R2, the common end of the resistor R3 and the resistor R4, and the common end of the resistor Rp and the resistor Rn are connected with each other;
one end of the resistor R0 is connected with the common ends of the resistor R1 and the resistor R2 through a switch S0, and the other end of the resistor R0 is connected with the common end of the resistor Rp and the resistor Rn after being connected with a voltage source Us in series;
and the common end of the resistor Rp and the resistor Rn is grounded.
A method for detecting an 800V energy storage system by adopting an insulation detection circuit is characterized by comprising the following steps: the method comprises the following steps:
s1, circuit self-checking: closing S2 and S5, and ensuring that Vp is R1/(R1+ R4); closing S3, S4, Vn ═ R2/(R2+ R3); closing S2 and S3, and enabling Vp/Vn to be R1/R2; closing S4 and S5, and enabling Vp/Vn to be R3/R4; if the deviation is larger than 10%, the circuit is in failure;
s2, insulation detection-rapid detection, closing S0\ S2\ S3,
U1is the voltage at R1 when Us is low, U1' is the voltage on R1 when Us is high;
s3, insulation detection-slow high precision detection,
closing S1, S2, S3 and S4, and enabling Rv to be R1+ R2 and Rb to be R3+ R4;
in measurement, S1, S2 and S3 are closed firstly, and voltage values P0 and N0 of the positive bus bar and the negative bus bar to the ground are obtained:
P0＝Rp||Rv，N0＝Rn||Rv (1)
then, the switch S4 is closed, and a group of voltage values P1 and N1 of the positive and negative buses to ground are measured:
P1＝Rp||Rv||Rb，N1＝Rn||Rv (2)
let x be Rn | | | Rv (3)
The simultaneous equations (1) and (2) are solved:
Rn＝Rvx/(Rv-x)；
s4, filtering:
calibrating a0, a1, a2 and b0 by simulation and experiment; y (n) represents output data, X (n) represents input data, n represents sampling time, and a0\ a1\ a2\ b0 are filter coefficients.
Compared with the prior art, the invention adopting the technical scheme has the following technical effects:
1. the detection result of the invention is reliable and effective, and the two detection methods are backups for each other;
2. the invention has high detection efficiency, simple operation and higher precision;
3. the invention has safe and reliable use and the circuit has a self-checking function;
4. the accuracy requirement can be met and the system fault and the component fault can be preliminarily positioned.
Drawings
FIG. 1 is a circuit diagram according to a first embodiment;
FIG. 2 is a diagram of a square wave signal with a voltage source of 15V according to an embodiment.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the attached drawings:
an insulation detection circuit of an 800V energy storage system is characterized in that: the circuit comprises a power supply, a resistor R0, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor Rp, a resistor Rn, a voltage source Us, a switch S0, a switch S1, a switch S2, a switch S3, a switch S4 and a switch S5;
one end of the resistor R1 is connected with the positive electrode of the power supply through a switch S2, the other end of the resistor R2 is connected with the resistor R2, and one end of the resistor R2, which is far away from the resistor R1, is connected with the negative electrode of the power supply through a switch S3;
one end of the resistor R3 is connected with the positive electrode of the power supply through a switch S4, the other end of the resistor R4, and one end of the resistor R4, which is far away from the resistor R3, is connected with the negative electrode of the power supply through a switch S5;
one end of the resistor Rp is connected with the positive electrode of the power supply, the other end of the resistor Rp is connected with the resistor Rn, and one end, far away from the resistor Rp, of the resistor Rn is connected with the negative electrode of the power supply;
the common end of the resistor R1 and the resistor R2, the common end of the resistor R3 and the resistor R4, and the common end of the resistor Rp and the resistor Rn are connected with each other;
one end of the resistor R0 is connected with the common ends of the resistor R1 and the resistor R2 through a switch S0, and the other end of the resistor R0 is connected with the common end of the resistor Rp and the resistor Rn after being connected with a voltage source Us in series;
and the common end of the resistor Rp and the resistor Rn is grounded.
2. A method of testing an 800V energy storage system using the insulation detection circuit of claim 1, wherein: the method comprises the following steps:
s1, circuit self-checking: closing S2 and S5, and ensuring that Vp is R1/(R1+ R4); closing S3, S4, Vn ═ R2/(R2+ R3); closing S2 and S3, and enabling Vp/Vn to be R1/R2; closing S4 and S5, and enabling Vp/Vn to be R3/R4; if the deviation is larger than 10%, the circuit is in failure;
s2, insulation detection-rapid detection, closing S0\ S2\ S3,
U1is the voltage at R1 when Us is low, U1' is the voltage on R1 when Us is high;
s3, insulation detection-slow high precision detection,
closing S1, S2, S3 and S4, and enabling Rv to be R1+ R2 and Rb to be R3+ R4;
in measurement, S1, S2 and S3 are closed firstly, and voltage values P0 and N0 of the positive bus bar and the negative bus bar to the ground are obtained:
P0＝Rp||Rv，N0＝Rn||Rv (1)
then, the switch S4 is closed, and a group of voltage values P1 and N1 of the positive and negative buses to ground are measured:
P1＝Rp||Rv||Rb，N1＝Rn||Rv (2)
let x be Rn | | | Rv (3)
The simultaneous equations (1) and (2) are solved:
Rn＝Rvx/(Rv-x)；
s4, filtering:
calibrating a0, a1, a2 and b0 by simulation and experiment; y (n) represents output data, X (n) represents input data, n represents sampling time, and a0\ a1\ a2\ b0 are filter coefficients.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modifications made on the basis of the technical scheme according to the technical idea of the present invention fall within the protection scope of the present invention. While the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (2)
1. An insulation detection circuit of an 800V energy storage system is characterized in that: the circuit comprises a power supply, a resistor R0, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor Rp, a resistor Rn, a voltage source Us, a switch S0, a switch S1, a switch S2, a switch S3, a switch S4 and a switch S5;
one end of the resistor R1 is connected with the positive electrode of the power supply through a switch S2, the other end of the resistor R2 is connected with the resistor R2, and one end of the resistor R2, which is far away from the resistor R1, is connected with the negative electrode of the power supply through a switch S3;
one end of the resistor R3 is connected with the positive electrode of the power supply through a switch S4, the other end of the resistor R4, and one end of the resistor R4, which is far away from the resistor R3, is connected with the negative electrode of the power supply through a switch S5;
one end of the resistor Rp is connected with the positive electrode of the power supply, the other end of the resistor Rp is connected with the resistor Rn, and one end, far away from the resistor Rp, of the resistor Rn is connected with the negative electrode of the power supply;
the common end of the resistor R1 and the resistor R2, the common end of the resistor R3 and the resistor R4, and the common end of the resistor Rp and the resistor Rn are connected with each other;
one end of the resistor R0 is connected with the common ends of the resistor R1 and the resistor R2 through a switch S0, and the other end of the resistor R0 is connected with the common end of the resistor Rp and the resistor Rn after being connected with a voltage source Us in series;
and the common end of the resistor Rp and the resistor Rn is grounded.
2. A method of testing an 800V energy storage system using the insulation detection circuit of claim 1, wherein: the method comprises the following steps:
s1, circuit self-checking: closing S2 and S5, and ensuring that Vp is R1/(R1+ R4); closing S3, S4, Vn ═ R2/(R2+ R3); closing S2 and S3, and enabling Vp/Vn to be R1/R2; closing S4 and S5, and enabling Vp/Vn to be R3/R4; if the deviation is larger than 10%, the circuit is in failure;
s2, insulation detection-rapid detection, closing S0\ S2\ S3,
U1is the voltage at R1 when Us is low, U1' is the voltage on R1 when Us is high;
s3, insulation detection-slow high precision detection,
closing S1, S2, S3 and S4, and enabling Rv to be R1+ R2 and Rb to be R3+ R4;
in measurement, S1, S2 and S3 are closed firstly, and voltage values P0 and N0 of the positive bus bar and the negative bus bar to the ground are obtained:
P0＝Rp||Rv，N0＝Rn||Rv (1)
then, the switch S4 is closed, and a group of voltage values P1 and N1 of the positive and negative buses to ground are measured:
P1＝Rp||Rv||Rb，N1＝Rn||Rv (2)
let x be Rn | | | Rv (3)
The simultaneous equations (1) and (2) are solved:
Rn＝Rvx/(Rv-x)；
s4, filtering:
calibrating a0, a1, a2 and b0 by simulation and experiment; y (n) represents output data, X (n) represents input data, n represents sampling time, and a0\ a1\ a2\ b0 are filter coefficients.
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| CN202010868229.2A CN111948504A (en) | 2020-08-25 | 2020-08-25 | 800V energy storage system insulation detection circuit and method |
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