CN117872194A - Detection method for insulation resistance, fault battery pack and short-circuit battery pack in energy storage system based on H bridge - Google Patents
Detection method for insulation resistance, fault battery pack and short-circuit battery pack in energy storage system based on H bridge Download PDFInfo
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- 238000009413 insulation Methods 0.000 title claims abstract description 66
- 238000004146 energy storage Methods 0.000 title claims abstract description 41
- 238000001514 detection method Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 34
- 101000579646 Penaeus vannamei Penaeidin-1 Proteins 0.000 claims abstract description 9
- 101000579647 Penaeus vannamei Penaeidin-2a Proteins 0.000 claims abstract description 9
- 239000003990 capacitor Substances 0.000 claims description 21
- 238000005070 sampling Methods 0.000 claims description 15
- 241000244189 Lineus Species 0.000 claims description 11
- 125000003275 alpha amino acid group Chemical group 0.000 claims description 7
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- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
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Abstract
The application discloses detection method of insulation impedance, fault battery pack and short-circuit battery pack in energy storage system based on H bridge, comprising the following steps: the positive and negative poles of the DC side of each battery pack are respectively connected in series with a relay K X The positive electrode and the negative electrode of the direct current side of the H bridge circuit module are connected; by controlling the relay K X Is of the open-close state, resistanceR i Obtaining two groups of different resistance value combinations; controlling the connection state of each battery pack through an H-bridge circuit module; obtaining two different typesR i In combination, two different sets of parametersU n1 、U n2 、U pen1 AndU pen2 . According to the method, the insulation impedance of the battery pack to be measured is calculated according to two different parametersR x The method comprises the steps of carrying out a first treatment on the surface of the According to insulation resistanceR x Judging a fault battery pack; according to the voltage between the short-circuit battery pack and the N zero line in the fault battery packUAnd short-circuit battery packU bat And the specific position of the short-circuit battery pack is obtained by the ratio of the battery pack to the short-circuit battery pack.
Description
Technical Field
The application relates to a detection method of insulation impedance, a fault battery pack and a short-circuit battery pack in an energy storage system based on an H bridge, and belongs to the field of energy storage and power electronic combination.
Background
Along with the high-speed development of source network side energy storage and industrial and commercial lithium iron phosphate battery energy storage systems, the risks of fire and the like of a plurality of energy storage power stations in application occur frequently due to battery leakage and damage of an insulation system in the application of the energy storage systems, the obstruction of equipment application is caused, and great economic loss and safety risks are brought to suppliers and users.
The application of the energy storage system is to combine the power electronic bidirectional converter of the energy storage system to design a related energy storage system scheme, and the energy storage system is applied to a group string type on a large scale at present, but along with the continuous updating and iteration of the technology, the H-bridge cascade energy storage system is rapidly applied to the market due to high efficiency and good stability. However, the H-bridge cascade energy storage system mainly uses a plurality of battery packs as units, and includes a plurality of battery packs, and in practical application, the phenomena such as battery leakage and the like need to be judged by using insulation impedance parameters, but the difficulty of judging the parameters is relatively high due to the complexity of the system, so that the difficulty of detecting the insulation impedance parameters is high.
Disclosure of Invention
In view of this, according to an aspect of the present application, a method for detecting insulation resistance, a faulty battery pack and a shorted battery pack in an H-bridge based energy storage system is provided, and the method mainly provides a method for detecting insulation resistance of a battery pack with high efficiency, safety and low cost for an H-bridge cascade energy storage system, so as to solve the problem that in the prior art, the insulation resistance of the battery pack is difficult to determine due to the fact that the energy storage system includes a plurality of battery packs and the battery packs include a plurality of battery packs. The specific scheme is as follows:
an insulation impedance detection method of an energy storage system based on an H bridge comprises the following steps:
n groups (N is more than or equal to 3) of battery packs to be tested, wherein each battery pack to be tested comprises a plurality of battery packs, and each battery pack comprises a battery pack and insulation impedance between the battery pack and PE ground wireR x ；
Series relay K in each battery pack to be tested x And a resistorR i The H bridge circuit modules are respectively connected in series in each battery pack;
controlling a switching device in the H bridge circuit module to enable one battery pack in the battery pack to be detected to be connected to the detection circuit, wherein the other battery packs in the battery pack to be detected are all in an off state;
by switching relays K in each battery to be tested x The open-close state of each battery pack to be testedR i Combining the two resistors to obtain two combined states;
respectively collecting resistorsR i In the combined state of the two resistors, two groups of voltage parameters from the connected battery pack in the battery pack to be tested to the N zero lineU n1 、U n2 And two sets of voltage parameters from zero line to PE groundU pen1 AndU pen2 ；
by two different sets of parametersU n1 、U n2 、U pen1 AndU pen2 establishing a binary once equation set to obtain the insulation impedance of the battery pack and the PE ground wireR x 。
Preferably, the insulation resistanceR x The calculation process of (1) is as follows:
(1) connecting one battery pack in the battery pack to be detected with the corresponding direct current side of the H-bridge circuit module by controlling a contactor of the corresponding H-bridge circuit module in the battery pack to be detected, wherein the other battery packs and the H-bridge circuit module are in an off state;
(2) the state of a switching device of the H-bridge circuit module is controlled, so that a battery pack to be tested and two battery packs connected in parallel with the battery packs to be tested are connected to a detection circuit;
(3) collecting the battery packs to be tested and relays K of two battery packs connected in parallel with the battery packs to be tested respectively x When the battery packs are in the closed state, the voltages from the battery packs communicated in the battery pack to be tested to the N zero lineU n2 And the voltage from the N zero line to the PE groundU pen2 The method comprises the steps of carrying out a first treatment on the surface of the When one of the two battery packs connected in parallel with the battery pack to be tested is in a disconnected state, the voltage from the battery pack communicated in the battery pack to be tested to the N zero lineU n1 And the voltage from the N zero line to the PE groundU pen1 ；
(4) According to the voltage from the battery pack communicated with the battery pack to be tested in the battery pack to be tested acquired twice in (3) to the N zero lineU n1 、U n2 And the voltage from the N zero line to the PE groundU pen1 AndU pen2 establishing a binary primary equation setR 30 =R b ‖R c Obtaining the formula (1);
formula (1);
in the formula (1), the amino acid sequence of the formula (1),R a for the series resistance on the main circuit in the battery pack to be tested,R b andR c respectively are series resistances on the main circuits of the two battery packs connected in parallel with the battery pack to be tested,I bd1 、I bd2 the current is respectively the current when the H-bridge circuit module corresponding to the communication battery pack in the battery pack to be tested is conducted and the current when the H-bridge circuit module is short-circuited;
(5) respectively calculating the current of the H-bridge circuit module corresponding to the connected battery pack in the battery pack to be detected when the H-bridge circuit module is conducted by the battery pack to be detectedI bd1 Current when short-circuited with H-bridge circuit moduleI bd2 Current difference between on-state and short-circuit state of H-bridge circuit module corresponding to connected battery pack in battery pack to be testedAs shown in formula (2);
formula (2);
(6) when two output ends of the H-bridge circuit module communicated with the battery pack in the battery pack to be tested are conducted and short-circuited, the voltage difference of the communicated battery pack in the battery pack to be testedCalculated from formula (3);
formula (3);
(7) through voltage differenceAnd current difference->Calculating insulation impedance of a communication battery pack in the battery pack to be testedR x The calculation formula is shown as formula (4):
formula (4);
because other battery packs in the battery pack to be tested are in the disconnected state, the insulation impedance of the connected battery pack in the resistor to be tested is calculatedR x The insulation resistance of the battery pack to be tested is obtained.
Preferably, the H-bridge circuit module includes: a switching element group, a capacitor C1 and a contactor assembly;
two ends of the capacitor C1 are respectively connected with two ends of the battery pack;
the switching element group comprises a switching element Q1, a switching element Q2, a switching element Q3 and a switching element Q4 which are symmetrically arranged with a capacitor C1 as a center;
the switching element Q1, the switching element Q2, the switching element Q3 and the switching element Q4 are respectively connected with the capacitor C1 to form an H-bridge circuit;
the contactor assembly comprises a switch KM2 and a parallel circuit of a switch K and a switch KM 1; the switch K is connected in series with a resistor R k ；
The input end and the output end of the parallel circuit of the switch K and the switch KM1 are respectively connected with one end of the capacitor C1 and one end of the battery pack;
the input end and the output end of the switch KM2 are respectively connected with the other end of the capacitor C1 and the other end of the battery pack.
Preferably, the main loop of each battery pack is respectively provided with a voltage sampling node, and the voltage sampling nodes are respectively positioned on the resistorsR i And between the N zero lines.
Preferably, the relay K x Located at the resistorR i And the PE ground wire.
A judging method of a fault battery pack in an energy storage system based on an H bridge is provided, and insulation impedance calculated according to an insulation impedance detection method of the energy storage system based on the H bridgeR x The judgment of the fault battery pack is carried out, specifically: if the calculated insulation impedance of one group of battery packs to be tested in the energy storage system of the H bridgeR x And if the value is smaller than the target value, judging the battery pack as a fault battery pack.
A method for judging the position of a short-circuit battery pack in an energy storage system based on an H bridge is disclosed, which is based on the insulation impedance calculated by an insulation impedance detection method of the energy storage system based on the H bridgeR x And judging the position of the short-circuit battery pack in the fault battery pack, wherein the judging method comprises the following steps:
first, according to insulation resistanceR x Calculating the voltage between the PE ground wire and the N zero wire of the short-circuit battery pack in the fault battery packU、And testing the cell voltage of the short-circuit battery packU bat ；
Then, through voltageU andvoltage (V)U bat And calculating the specific position of the short-circuit battery pack.
PreferablyVoltage of short-circuited battery pack in faulty battery packUCalculated according to formula (5);
formula (5);
in the formula (5), the amino acid sequence of the compound,U pen for the voltage from the PE ground line to the N zero line in the battery pack where the short-circuited battery pack is located in the failed battery pack,R x to short circuit the insulation resistance corresponding to the battery pack,Ito short circuit the corresponding current of the battery pack.
Preferably, the specific position of the short-circuit battery pack in the fault battery packBAT n Calculated according to formula (6);
formula (6);
in the formula (6), the amino acid sequence of the compound,Uto calculate the voltage of the shorted cell pack in the failed battery,U bat and the voltage value of the short-circuit battery pack is tested.
The beneficial effects that this application can produce include:
the application connects each battery pack to be tested in parallel, and respectively connects the relays K in series on the main circuits of the battery packs to be tested in parallel x And a resistorR i The method comprises the steps of carrying out a first treatment on the surface of the Each parallel battery pack comprises a plurality of parallel battery packs, and H bridge circuit modules are respectively and correspondingly connected into the battery packs; by controlling the relays K of each battery to be tested x The open-close state of the main circuit of each battery pack to be testedR i And combining to obtain different resistance values, and controlling the connection state of each battery pack through the on-off state of the H bridge circuit module.
Controlling one battery pack in the battery packs to be tested to be in a communication state, and the other battery packs to be in a short circuit state, and respectively collecting two battery packs connected in the battery packs to be tested to an N zero line when one parallel battery pack of the battery packs to be tested and two battery packs connected in parallel with the battery packs to be tested is closed and the other parallel battery packs are opened when the other parallel battery packs are closed and openedThe secondary voltage value and the secondary voltage value between the N zero line and the PE ground wire are used for establishing a binary primary equation through the collected secondary voltage value of the N zero line and the collected secondary voltage value between the N zero line and the PE ground wire, and finally calculating the insulation impedance of the battery pack to be testedR x And according to the calculated insulation resistanceR x Whether the battery pack to be tested is smaller than the target value or not is judged;
then, judging a short-circuit battery pack in the fault battery pack by calculating the voltage between each battery pack in the fault battery pack and the N zero line; the method solves the problem that in the prior art, as the H-bridge cascade energy storage system comprises a plurality of battery packs and the system is complex, the detection of the insulation resistance of the battery packs is difficult to realize, and further searches out which battery pack in the fault battery pack (cluster) has the insulation resistance smaller than a preset value, so that the short-circuit battery pack in the fault point is judged.
Calculating the specific position of the short-circuit battery pack according to the ratio of the voltage between the short-circuit battery pack and the N zero line in the fault battery pack and the voltage of the battery cell of the short-circuit battery pack; finally, the method and the device can identify the problematic battery pack (cluster) to be tested by accurately calculating the insulation resistance of the battery pack, and accurately identify the position of the specific short-circuit battery pack in the fault battery pack, so that whether the short-circuit battery pack is damaged in insulation or leaked or not can be timely found.
Drawings
FIG. 1 is a flow chart of a method for detecting insulation resistance of an energy storage system based on an H-bridge;
FIG. 2 is a schematic diagram of a method for detecting insulation resistance of an energy storage system based on an H-bridge;
FIG. 3 is a1 level state of an H-bridge circuit module in a method for detecting insulation resistance of an energy storage system based on an H-bridge according to the present application;
FIG. 4 is a diagram illustrating a 0 level state of an H-bridge circuit module in a method for detecting insulation resistance of an energy storage system based on an H-bridge according to the present application;
FIG. 5 is a schematic diagram of the first embodiment of the present application, in which the output of the BATa_1 battery pack in the battery pack A is 1 level, and the outputs of the other BTAA, BATb and BATc are all 0 level;
fig. 6 is a schematic circuit diagram of the first embodiment of the present application when the battery pack a is in a closed state, the battery pack B is in a closed state, and the battery pack C is in an open state;
fig. 7 is a schematic circuit diagram of the battery pack a to be tested and the battery packs B and C connected in parallel in the first embodiment of the present application.
Detailed Description
The present application is described in detail below with reference to examples, but the present application is not limited to these examples.
Examples
As shown in fig. 2, in this embodiment, three battery packs to be tested of group a, group B and group C are connected in parallel, and two ends of the three battery packs to be tested of group a, group B and group C are respectively connected with a PE ground wire and an N zero wire;
n parallel battery packs of BATa-1 to BATa-n are respectively connected in parallel in three battery packs to be tested of A group, B group and C group, and each battery pack comprises a battery pack and insulation resistance (resistance) of the battery pack to PE ground wireR x The object to be detected in this application is the insulation resistance (resistance)R x 。
If the to-be-detected battery packs are connected with four groups in parallel, disconnecting one group of the battery packs, and detecting according to a method of connecting the three groups of the battery packs in parallel.
The connection process of each battery pack circuit to be tested in the first embodiment is as follows:
n battery packs of BATa-1 to BATa-n are connected in parallel, and H bridge circuit modules are respectively and correspondingly connected in each battery pack; respectively connecting n battery packs connected in parallel from BATa-1 to BATa-n into three battery packs to be tested of A group, B group and C group; insulation impedances (resistors) are respectively connected between n battery packs of BATa-1 to BATa-n and PE ground wireR x The method comprises the steps of carrying out a first treatment on the surface of the The main loops of the three battery packs to be tested of the A group, the B group and the C group are respectively connected with a resistor R in series a 、R b And R is c And a relay K x Wherein relay K x Near PE ground line, resistance R a 、R b And R is c Near the N zero linePlacing; respectively at the resistor R a 、R b And R is c And end voltage sampling nodes of the battery pack to be tested are respectively arranged between the end voltage sampling nodes and the N zero line. The method comprises the following steps:
series relay K in A group battery pack to be tested a And resistance R a Relay K a And resistance R a Two ends of the series circuit of (a) are respectively correspondingly connected in parallel with two ends of n parallel battery packs in the A group battery pack to be tested, and the resistor R a Setting an end voltage sampling node A point of the battery pack to be tested of the A group between the end voltage sampling node A point and the N zero line; wherein, n battery packs from BATa-1 to BATa-n connected in parallel in the battery pack to be tested in the A group are respectively connected to PE ground wires, and insulation resistance is Ra1, ra2 and Ra3.
Series relay K in B group battery pack to be tested b And resistance R b Relay K b And resistance R b Two ends of the series circuit of (2) are correspondingly connected in parallel with two ends of n parallel battery packs in the B group battery packs to be tested respectively; at the resistance R b Setting an end voltage sampling node B point of a battery pack to be tested of the B group between the end voltage sampling node B point and the N zero line; the n battery packs of BATa-1 to BATa-n connected in parallel in the battery pack B to be tested are respectively connected to PE ground wires, and insulation impedances Rb1, rb2 and Rb3.
Series relay K in C group battery pack to be tested c And resistance R c Relay K c And resistance R c Two ends of the series circuit of (2) are respectively and correspondingly connected in parallel with two ends of n parallel battery packs in the C battery packs to be tested, and the resistor R c Setting a point C of an end voltage sampling node of the battery pack to be tested of the C group between the battery pack to be tested and the N zero line; the n battery packs of BATa-1 to BATa-n connected in parallel in the battery pack to be tested of the C group are respectively connected to PE ground wires, and insulation impedances Rc1, rc2 and Rc3.
The PE ground line is provided with a node PE, and the voltages from the node A to the node N zero line are expressed as a voltage U an The method comprises the steps of carrying out a first treatment on the surface of the The voltage on node B to N zero line is represented as voltage U bn The method comprises the steps of carrying out a first treatment on the surface of the The voltage of the zero line from node C to N is represented as voltage U cn The method comprises the steps of carrying out a first treatment on the surface of the The voltage at node PE to the N zero line is denoted as voltage U pen 。
Then, the H bridge circuit module is respectively connected into n parallel battery packs of BATa-1 to BATa-n which are connected in parallel in three battery packs to be tested of A group, B group and C group;
the H-bridge circuit module includes: resistor R k The capacitor C1 is correspondingly connected with the battery pack respectively, and the switch element group and the contactor component are respectively positioned at two sides of the capacitor C1;
one battery pack in the battery pack to be tested is controlled to be connected to the detection circuit through the switch element group, and the other battery packs are disconnected;
by switching the relays K in the three battery packs to be tested of the A group, the B group and the C group x To make group A, group B and group C three battery packsR i The combination is two resistance value combinations.
The contactor assembly includes: a switch KM1, a switch KM2 and a switch K;
one end of the switch KM1 is connected with one end of the battery pack, the other end of the switch KM1 is connected with one end of the capacitor C1, and two ends of the switch KM2 are respectively connected with the other end of the battery pack and the other end of the capacitor C1;
said switch K and said resistor R k In series with the switch K and the resistor R k Is connected in parallel with the switch KM 1;
the switching element group includes a switching element Q1, a switching element Q2, a switching element Q3, and a switching element Q4.
The switching element Q1, the switching element Q2, the switching element Q3 and the switching element Q4 are respectively arranged around the capacitor C1, and form an H-bridge circuit with the capacitor C1, wherein the switching element Q1 and the switching element Q2 are connected in series, the switching element Q3 and the switching element Q4 are connected in series, the series circuit of the switching element Q1 and the switching element Q2 and the series circuit of the switching element Q3 and the switching element Q4 are respectively connected with two ends of the capacitor C1, the output end of the series circuit of the switching element Q1 and the switching element Q2 is AC1, and the output end of the series circuit of the switching element Q3 and the switching element Q4 is AC2;
wherein the H bridge circuit module includes: a connected state (i.e., a 1-level state) and a shorted state (i.e., a 0-level state).
The state shown in fig. 3 is a connection state (1 level state) of the H-bridge circuit module and the battery pack, that is, the output voltages of the two output terminals AC1 and AC2 of the H-bridge circuit module are the same as the voltage of the battery pack. The switching mode is as follows: firstly controlling the switch K to be attracted to charge the capacitor C1, when the voltage of the capacitor C1 approaches to the voltage of the battery pack, attracting KM1 to disconnect the switch K, then controlling the switch element Q1 and the switch element Q4 to be conducted, so that the voltages of the output ends AC1 and AC2 of the two output ends of the H bridge circuit module are the voltages of the connected battery pack, and the state of the whole circuit is in a connected state (namely, a1 level state);
the state shown in fig. 4 is a short circuit state (i.e., 0 level state) of the H-bridge circuit module and the battery module, that is, two output terminals AC1 and AC1 of the H-bridge circuit module are short-circuited, and the electrical circuit is connected together. The state switching mode is as follows: the switch KM1, the switch KM2, and the switch K are maintained in an off state, and the switching element Q2 and the switching element Q3 are controlled to be turned on, so that the output terminals AC1 and AC1 are connected together in a short circuit electrical circuit, and the state of the entire circuit is a short circuit state (i.e., a 0-level state).
The flow of this embodiment is shown in fig. 1, and specifically includes:
when the insulation resistance of the battery pack to be tested of the A group is detected, the state of an MOS tube in an H bridge circuit module correspondingly connected with each battery pack in the battery pack to be tested of the A group is controlled by a control unit, so that the output state of the battery pack BATa_1 is in a1 level state, and the states of the battery packs BATa_2 to BATa_n of the rest battery packs in the battery pack to be tested of the A group are in a 0 level state; the measured resistance Ra1 between the BATa_1 battery pack and the PE ground wire is the insulation resistance of the A group battery pack to be tested;
by controlling relays K correspondingly connected on main loops of battery packs to be tested of groups A, B and C a 、K b 、K c The three groups of battery packs to be tested of the group A, the group B and the group C are subjected to different resistance value combinations, as shown in the attached figure 5, specifically:
first, as shown in FIG. 6, control K a Suction, K b Suction, K c The resistor R in the A group battery pack to be tested is disconnected a And resistance in group B test batteryR b Effectively accessing the circuit; the on voltage from the insulation resistance (resistance) Ra1 of the battery pack BATa_1 to the PE ground wire is obtained through sampling by a circuit sampling unitU ad1 On-voltage from PE ground line to N zero lineU cd1 ；
Control K according to FIG. 7 a Suction, K b Suction, K c Attraction, at this time, resistance R a 、R b And R is c All are effectively connected into the circuit, and the insulation resistance R of the battery pack BATa_1 is obtained through sampling by the circuit sampling unit a1 Short circuit voltage to PE groundU ad2 Short circuit voltage from PE ground line to N zero lineU cd2 。
Second, based on the measured turn-on voltageU ad1 AndU cd1 and short-circuit voltageU ad2 And short circuit voltageU cd2 Establishing a binary once equation setR 30 =R a ‖RcObtaining the formula (1):
formula (1);
according to (1), the current when the output state of the battery pack BATa_1 is 1 level state is calculatedI bd1 And current when the output state of the battery pack BATa_1 is 0 level stateI bd2 ；
Calculating the current difference between the 1-level state of the battery pack BATa_1 and the 0-level state of the BATa_1 according to (2)；
Formula (2);
calculating the voltage difference between the 1-level state of the battery pack BATa_1 and the 0-level state of the BATa_1 according to the step (3)；
Formula (3);
by calculating the voltage difference between the 1 level state and the 0 level state of the battery pack BATa_1And current difference->Calculating the resistance Ra1 of the battery pack BATa_1 by the formula (4);
formula (4);
because the battery packs BATa_2 to BATa_n are in a 0 level state in the battery pack to be tested of the group A, the resistor Ra1 of the battery pack BATa_1 is the insulation resistance value of the battery pack to be tested of the group A;
then, according to the testing method of Ra1, the values of the resistors Ra 2-Ran in the A-group battery to be tested, the values of the resistors Rb 1-Rbn in the B-group battery to be tested and the values of the resistors RC 1-Rcn in the C-group battery to be tested are calculated in sequence, so that the insulation resistance values of the A-group battery, the B-group battery, the C-group battery and the like are obtained.
The failure battery pack (cluster) can be determined from the calculated resistances Ra1 to Ran, resistances Rb1 to Rbn, and resistances RC1 to Rcn, specifically: if any resistance value among the calculated resistances Ra1 to Ran, rb1 to Rbn, and RC1 to Rcn is smaller than the target value, the battery pack to be tested and the faulty battery pack (cluster) smaller than the target value are determined.
Finally, further checking the fault battery pack, taking the battery pack to be tested of the A group as an example, specifically: if the calculated resistance Ra1 is smaller than the target value, judging the battery pack to be tested of the A group as a fault battery pack, and then further checking a specific short-circuit battery pack in the battery pack to be tested of the A group, wherein the checking method comprises the following steps:
firstly, collecting the cell voltage of each battery pack in the A-group battery pack to be testedU dc The calculated current of each battery pack in the A group battery pack to be testedI db Resistance of each battery packRanSubstituting into (5), respectively calculating the voltage of each battery pack in the A group battery pack to be testedU bc 。
The embodiment uses BAT 1 The battery pack is taken as an example to calculate, and the acquired BAT is used for the calculation 1 The cell voltage of the battery pack is recorded asU dc1 ，BAT 1 The corresponding resistance of the battery pack is Ra1 and BAT 1 The corresponding current of the battery pack is recorded asI db1 Will respectivelyU dc1 Ra1, ra1I db1 Substitution type (5)U=U pen -I×R x In (1) to obtain BAT 1 Voltage between battery pack and N zero lineU bc1 The calculation formula (7) of (2);
formula (7);
then, based on the calculated voltageU bc1 Whether the corresponding battery pack is short-circuited is judged according to whether the battery pack is smaller than the target value;
finally, calculating the specific position of the short-circuit battery pack according to the formula (6)BAT n Thereby finding out the specific position of the short-circuit battery pack;
formula (6);
in the formula (6), the amino acid sequence of the compound,U bat for the measured voltage value of the short-circuited battery pack, i.e. the voltage of the above-mentioned node A to N zero line is expressed as voltageU an ，U bc Is the voltage of the short-circuited battery pack calculated in formula (5).
The foregoing description is only a few examples of the present application and is not intended to limit the present application in any way, and although the present application is disclosed in the preferred examples, it is not intended to limit the present application, and any person skilled in the art may make some changes or modifications to the disclosed technology without departing from the scope of the technical solution of the present application, and the technical solution is equivalent to the equivalent embodiments.
Claims (9)
1. The detection method of the insulation impedance of the energy storage system based on the H bridge is characterized by comprising the following steps of:
n groups (N is more than or equal to 3) of battery packs to be tested, wherein each battery pack to be tested comprises a plurality of battery packs, and each battery pack comprises a battery pack and insulation impedance between the battery pack and PE ground wireR x ；
Series relay K in each battery pack to be tested x And a resistorR i The H bridge circuit modules are respectively connected in series in each battery pack;
controlling a switching device in the H bridge circuit module to enable one battery pack in the battery pack to be detected to be connected to the detection circuit, wherein the other battery packs in the battery pack to be detected are all in an off state;
by switching relays K in each battery to be tested x The open-close state of each battery pack to be testedR i Combining the two resistors to obtain two combined states;
respectively collecting resistorsR i In the combined state of the two resistors, two groups of voltage parameters from the connected battery pack in the battery pack to be tested to the N zero lineU n1 、U n2 And two sets of voltage parameters from zero line to PE groundU pen1 AndU pen2 ；
by two different sets of parametersU n1 、U n2 、U pen1 AndU pen2 establishing a binary once equation set to obtain the insulation impedance of the battery pack and the PE ground wireR x 。
2. The method for detecting insulation resistance of H-bridge based energy storage system according to claim 1, wherein the method comprises the steps ofThe insulation resistanceR x The calculation process of (1) is as follows:
(1) connecting one battery pack in the battery pack to be detected with the corresponding direct current side of the H-bridge circuit module by controlling a contactor of the corresponding H-bridge circuit module in the battery pack to be detected, wherein the other battery packs and the H-bridge circuit module are in an off state;
(2) the state of a switching device of the H-bridge circuit module is controlled, so that a battery pack to be tested and two battery packs connected in parallel with the battery packs to be tested are connected to a detection circuit;
(3) collecting the battery packs to be tested and relays K of two battery packs connected in parallel with the battery packs to be tested respectively x When the battery packs are in the closed state, the voltages from the battery packs communicated in the battery pack to be tested to the N zero lineU n2 And the voltage from the N zero line to the PE groundU pen2 The method comprises the steps of carrying out a first treatment on the surface of the When one of the two battery packs connected in parallel with the battery pack to be tested is in a disconnected state, the voltage from the battery pack communicated in the battery pack to be tested to the N zero lineU n1 And the voltage from the N zero line to the PE groundU pen1 ；
(4) According to the voltage from the battery pack communicated with the battery pack to be tested in the battery pack to be tested acquired twice in (3) to the N zero lineU n1 、U n2 And the voltage from the N zero line to the PE groundU pen1 AndU pen2 establishing a binary primary equation setR 30 =R b ‖R c Obtaining the formula (1);
formula (1);
in the formula (1), the amino acid sequence of the formula (1),R a for the series resistance on the main circuit in the battery pack to be tested,R b andR c respectively are series resistances on the main circuits of the two battery packs connected in parallel with the battery pack to be tested,I bd1 、I bd2 respectively corresponding to the connected battery packs in the battery packs to be testedThe current when the H-bridge circuit module is conducted and the H-bridge circuit module is short-circuited;
(5) respectively calculating the current of the H-bridge circuit module corresponding to the connected battery pack in the battery pack to be detected when the H-bridge circuit module is conducted by the battery pack to be detectedI bd1 Current when short-circuited with H-bridge circuit moduleI bd2 Current difference between on-state and short-circuit state of H-bridge circuit module corresponding to connected battery pack in battery pack to be testedAs shown in formula (2);
formula (2);
(6) when two output ends of the H-bridge circuit module communicated with the battery pack in the battery pack to be tested are conducted and short-circuited, the voltage difference of the communicated battery pack in the battery pack to be testedCalculated from formula (3);
formula (3);
(7) through voltage differenceAnd current difference->Calculating insulation impedance of a communication battery pack in the battery pack to be testedR x The calculation formula is shown as formula (4);
formula (4);
because other battery packs in the battery pack to be tested are in the disconnected state, the insulation impedance of the connected battery pack in the resistor to be tested is calculatedR x The insulation resistance of the battery pack to be tested is obtained.
3. The H-bridge based energy storage system insulation resistance detection method of claim 1, wherein the H-bridge circuit module comprises: a switching element group, a capacitor C1 and a contactor assembly;
two ends of the capacitor C1 are respectively connected with two ends of the battery pack;
the switching element group comprises a switching element Q1, a switching element Q2, a switching element Q3 and a switching element Q4 which are symmetrically arranged with a capacitor C1 as a center;
the switching element Q1, the switching element Q2, the switching element Q3 and the switching element Q4 are connected with the capacitor C1 to form an H-bridge circuit;
the contactor assembly comprises a switch KM2 and a parallel circuit of a switch K and a switch KM 1; the switch K is connected in series with a resistor R k ；
The input end and the output end of the parallel circuit of the switch K and the switch KM1 are respectively connected with one end of the capacitor C1 and one end of the battery pack;
the input end and the output end of the switch KM2 are respectively connected with the other end of the capacitor C1 and the other end of the battery pack.
4. The H-bridge based insulation resistance detection method of an energy storage system according to claim 1, wherein voltage sampling nodes are respectively arranged on the main loops of the battery packs, and the voltage sampling nodes are respectively positioned on the resistorsR i And between the N zero lines.
5. The H-bridge based insulation resistance detection method of an energy storage system of claim 1, wherein the relay K x Located at the resistorR i And the PE ground wire.
6. A method for judging a fault battery pack in an H-bridge based energy storage system is characterized by comprising the following steps of1-5, the insulation impedance calculated by the insulation impedance detection method of any energy storage system based on an H bridgeR x The judgment of the fault battery pack is carried out, specifically: if the calculated insulation impedance of one group of battery packs to be tested in the energy storage system of the H bridgeR x And if the value is smaller than the target value, judging the battery pack as a fault battery pack.
7. The method for determining the position of a short-circuit battery pack in an H-bridge-based energy storage system is characterized in that the insulation resistance calculated by the insulation resistance detection method of any one of the H-bridge-based energy storage systems according to claims 1 to 5R x And judging the position of the short-circuit battery pack in the fault battery pack, wherein the judging method comprises the following steps:
first, according to insulation resistanceR x Calculating the voltage between the PE ground wire and the N zero wire of the short-circuit battery pack in the fault battery packU、And testing the cell voltage of the short-circuit battery packU bat ；
Then, through voltageU andvoltage (V)U bat And calculating the specific position of the short-circuit battery pack.
8. The method of claim 7, wherein the voltage of the shorted cell in the failed battery is determined based on a position of the shorted cell in the H-bridge based energy storage systemUCalculated according to formula (5);
formula (5);
in the formula (5), the amino acid sequence of the compound,U pen for the voltage from the PE ground line to the N zero line in the battery pack where the short-circuited battery pack is located in the failed battery pack,R x to short circuit the insulation resistance corresponding to the battery pack,Ito short circuit the corresponding current of the battery pack.
9. An H-bridge based energy storage system according to claim 8The method for judging the position of the middle short-circuit battery pack is characterized in that the specific position of the short-circuit battery pack in the fault battery packBAT n Calculated according to formula (6);
formula (6);
in the formula (6), the amino acid sequence of the compound,Uto calculate the voltage of the shorted cell pack in the failed battery,U bat and the voltage value of the short-circuit battery pack is tested.
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Citations (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU951194A1 (en) * | 1981-01-04 | 1982-08-15 | Белорусское Производственное Ремонтно-Наладочное Предприятие "Белэнергоремналадка" | Device for measuring and checking insulation resistance |
| KR970054672A (en) * | 1995-12-29 | 1997-07-31 | 배순훈 | Insulation resistance tester for lithium battery (Li / MnO_2 Battery) |
| JPH1144715A (en) * | 1997-07-29 | 1999-02-16 | Murata Mfg Co Ltd | Measurement of insulating resistance of electronic part |
| DE10139636C1 (en) * | 2001-08-11 | 2003-04-10 | Preh Elektro Feinmechanik | Electrical resistance measuring device for detonator for passenger restraint gas generator uses spring-loaded contacts for measuring short-circuit, detonator and insulation resistances |
| JP2008128758A (en) * | 2006-11-20 | 2008-06-05 | Matsushita Electric Ind Co Ltd | Method for measuring insulating resistance of electrostatic countermeasure part |
| US20150194922A1 (en) * | 2014-01-08 | 2015-07-09 | Fanuc Corporation | Motor drive device including insulation deterioration detection function and insulation resistance detection method of motor |
| CN106997006A (en) * | 2017-04-20 | 2017-08-01 | 广州致远电子股份有限公司 | A kind of calibration method and device of the insulation resistance measurement circuit based on H resistor bridges |
| CN109188230A (en) * | 2018-08-15 | 2019-01-11 | 华为技术有限公司 | A kind of circuit, method and Vehicular charger detecting mains isolation |
| WO2020253876A1 (en) * | 2019-06-20 | 2020-12-24 | 江苏固德威电源科技股份有限公司 | Circuit and method for detecting insulation resistance of photovoltaic array to ground, and photovoltaic inverter |
| CN114448228A (en) * | 2022-04-11 | 2022-05-06 | 南京力骏新能源储能研究院有限公司 | Redundancy control method and system of direct-hanging energy storage converter based on port voltage state discrimination |
| CN115173364A (en) * | 2022-07-26 | 2022-10-11 | 西安奇点能源技术有限公司 | Short-circuit protection circuit and protection method based on H-bridge-level contact system |
| CN115912930A (en) * | 2022-11-18 | 2023-04-04 | 阳光电源股份有限公司 | Isolation converter, photovoltaic system and insulation impedance detection method |
| CN115967254A (en) * | 2022-12-21 | 2023-04-14 | 阳光电源股份有限公司 | Power converter and insulation impedance detection method thereof |
| CN115980448A (en) * | 2022-12-21 | 2023-04-18 | 阳光电源（上海）有限公司 | Power converter and insulation impedance detection method thereof |
| CN219554603U (en) * | 2023-02-22 | 2023-08-18 | 西安奇点能源股份有限公司 | Bidirectional energy storage converter control system |
| CN116973631A (en) * | 2023-08-03 | 2023-10-31 | 阳光电源（上海）有限公司 | Power converter and insulation impedance detection method thereof |
| CN117630668A (en) * | 2023-11-28 | 2024-03-01 | 上海交通大学 | High-voltage direct-hanging energy storage module testing system based on symmetrical module group and control method |
-
2024
- 2024-03-11 CN CN202410269412.9A patent/CN117872194B/en active Active
Patent Citations (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU951194A1 (en) * | 1981-01-04 | 1982-08-15 | Белорусское Производственное Ремонтно-Наладочное Предприятие "Белэнергоремналадка" | Device for measuring and checking insulation resistance |
| KR970054672A (en) * | 1995-12-29 | 1997-07-31 | 배순훈 | Insulation resistance tester for lithium battery (Li / MnO_2 Battery) |
| JPH1144715A (en) * | 1997-07-29 | 1999-02-16 | Murata Mfg Co Ltd | Measurement of insulating resistance of electronic part |
| DE10139636C1 (en) * | 2001-08-11 | 2003-04-10 | Preh Elektro Feinmechanik | Electrical resistance measuring device for detonator for passenger restraint gas generator uses spring-loaded contacts for measuring short-circuit, detonator and insulation resistances |
| JP2008128758A (en) * | 2006-11-20 | 2008-06-05 | Matsushita Electric Ind Co Ltd | Method for measuring insulating resistance of electrostatic countermeasure part |
| US20150194922A1 (en) * | 2014-01-08 | 2015-07-09 | Fanuc Corporation | Motor drive device including insulation deterioration detection function and insulation resistance detection method of motor |
| CN106997006A (en) * | 2017-04-20 | 2017-08-01 | 广州致远电子股份有限公司 | A kind of calibration method and device of the insulation resistance measurement circuit based on H resistor bridges |
| CN109188230A (en) * | 2018-08-15 | 2019-01-11 | 华为技术有限公司 | A kind of circuit, method and Vehicular charger detecting mains isolation |
| WO2020253876A1 (en) * | 2019-06-20 | 2020-12-24 | 江苏固德威电源科技股份有限公司 | Circuit and method for detecting insulation resistance of photovoltaic array to ground, and photovoltaic inverter |
| CN114448228A (en) * | 2022-04-11 | 2022-05-06 | 南京力骏新能源储能研究院有限公司 | Redundancy control method and system of direct-hanging energy storage converter based on port voltage state discrimination |
| CN115173364A (en) * | 2022-07-26 | 2022-10-11 | 西安奇点能源技术有限公司 | Short-circuit protection circuit and protection method based on H-bridge-level contact system |
| CN115912930A (en) * | 2022-11-18 | 2023-04-04 | 阳光电源股份有限公司 | Isolation converter, photovoltaic system and insulation impedance detection method |
| CN115967254A (en) * | 2022-12-21 | 2023-04-14 | 阳光电源股份有限公司 | Power converter and insulation impedance detection method thereof |
| CN115980448A (en) * | 2022-12-21 | 2023-04-18 | 阳光电源（上海）有限公司 | Power converter and insulation impedance detection method thereof |
| CN219554603U (en) * | 2023-02-22 | 2023-08-18 | 西安奇点能源股份有限公司 | Bidirectional energy storage converter control system |
| CN116973631A (en) * | 2023-08-03 | 2023-10-31 | 阳光电源（上海）有限公司 | Power converter and insulation impedance detection method thereof |
| CN117630668A (en) * | 2023-11-28 | 2024-03-01 | 上海交通大学 | High-voltage direct-hanging energy storage module testing system based on symmetrical module group and control method |
Non-Patent Citations (2)
| Title |
|---|
| 杨为;谢永芳;胡志坤;: "高压动力电池组绝缘性能的实时监测研究", 计算技术与自动化, no. 03, 15 September 2015 (2015-09-15) * |
| 郭谋发;游林旭;魏晓莹;高伟;杨耿杰;: "一种基于电压反馈控制的配电网短路故障柔性限流方法", 电工技术学报, no. 11, 10 June 2017 (2017-06-10) * |
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