CN117607545A - Communication-free time-sharing round-robin detection method for insulation impedance of multi-machine energy storage converter - Google Patents
Communication-free time-sharing round-robin detection method for insulation impedance of multi-machine energy storage converter Download PDFInfo
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- CN117607545A CN117607545A CN202410094579.6A CN202410094579A CN117607545A CN 117607545 A CN117607545 A CN 117607545A CN 202410094579 A CN202410094579 A CN 202410094579A CN 117607545 A CN117607545 A CN 117607545A
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- 238000001514 detection method Methods 0.000 title claims abstract description 133
- 238000004146 energy storage Methods 0.000 title claims abstract description 90
- 238000009413 insulation Methods 0.000 title claims abstract description 84
- 238000000034 method Methods 0.000 claims abstract description 26
- 238000005259 measurement Methods 0.000 claims description 12
- 238000004891 communication Methods 0.000 abstract description 4
- 238000007689 inspection Methods 0.000 description 7
- 238000005070 sampling Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 4
- 238000012795 verification Methods 0.000 description 3
- 238000012935 Averaging Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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- 238000001914 filtration Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
Abstract
The embodiment of the invention provides a communication-free time-sharing round-robin detection method for insulation impedance of a multi-machine energy storage converter, belonging to the technical field of insulation detection of energy storage converters; the energy storage converters which are operated in parallel are connected with the upper computer in a communication-free manner; an insulation impedance detection circuit based on an unbalanced bridge method is arranged on the direct current side of each energy storage converter; the unification of the time reference of the built-in real-time clock module of the energy storage converter is realized through an external time synchronization source; the real-time clock module counts the minute time T, presets the same detection time T of each insulation impedance detection circuit, and controls the insulation impedance detection circuits to start detection one by one continuously every detection time T in turn. According to the invention, the time-sharing round-robin detection can be realized by utilizing the real-time clock of the energy storage converters without adding extra hardware cost and communication links, and the problem of protection misoperation caused by the mutual influence of insulation detection of a plurality of energy storage converters is avoided.
Description
Technical Field
The invention belongs to the technical field of insulation detection of energy storage converters, and particularly relates to a communication-free time-sharing round inspection method of insulation impedance of a multi-machine energy storage converter.
Background
The insulation impedance detection circuit of the energy storage converter is an important circuit structure for finding serious faults such as a direct current side, particularly a positive-negative pole-to-ground short circuit or an interelectrode short circuit of an energy storage battery in advance. With the current increasing capacity of a single energy storage system module, at least two energy storage converters are often required to operate in parallel to realize capacity matching. At present, due to the fact that a cooperative mechanism is lacking among the plurality of energy storage converters, the condition that an insulation detection circuit is simultaneously input exists, at the moment, mutual influence exists, the calculated positive insulation resistance to ground and the calculated negative insulation resistance to ground are invalid, and error protection is triggered when the calculated positive insulation resistance to ground and the calculated negative insulation resistance to ground are serious, so that normal operation of the whole energy storage system is affected.
The existing relevant cooperative mechanism comprises that the energy storage converter exits from an insulation detection circuit, the insulation detection is carried out by a battery management system at the battery side, or the time-sharing round inspection for realizing the insulation detection is controlled by an upper-level energy management system, the workload of field debugging and the complexity of system logic are increased by the method, and the implementation effect is poor.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a communication-free time-sharing round inspection method for insulation impedance of a multi-machine energy storage converter, so as to solve the technical problems.
The invention provides a communication-free time-sharing round-robin detection method for insulation impedance of a plurality of energy storage converters, wherein the plurality of energy storage converters which are in parallel operation are in communication-free connection with an upper computer; the direct current side of each energy storage converter is provided with an insulation impedance detection circuit based on an unbalanced bridge method; executing the communication-free time-sharing round-robin detection method through an original energy storage converter control system; the method comprises the following steps:
the unification of the time reference of the built-in real-time clock module of the energy storage converter is realized through an external time synchronization source;
the real-time clock module is used for counting the minute time T, the same detection time T of each insulation impedance detection circuit is preset, and the insulation impedance detection circuits are controlled to be started to detect one by one in turn every detection time T.
Further, the unifying of the time reference of the built-in real-time clock module of the energy storage converter is realized through an external time synchronization source, and the unifying comprises the following steps:
acquiring a time synchronization code element signal which is sent by an external time synchronization source and comprises reference time;
identifying the code element type, judging the validity of the time symbol signal according to the code element type, and checking the validity of the time symbol signal;
extracting reference time of 'year, month, day, time, minute, second and millisecond' bits in the code element signal according to the code element type;
and writing the same reference time into a real-time clock module built in each energy storage converter.
Further, the detecting circuit is controlled to turn on detection one by one every the detection time T continuously and alternately, and the method includes:
according to the current minute time T, the total number N of energy storage converters running in parallel and the detection time T, determining the next energy storage converter N to be detected, wherein the formula is as follows:n is an integer in the order of 1 to n of each energy storage converter.
Further, the method further comprises the following steps: presetting the measurement time length to the ground or the negative groundT 1 Presetting the switching interval duration of positive and negative earth measurementT 2 And sets up to satisfy: 2T 1 +T 2 ≤T。
Further, the method further comprises the following steps: presetting the insulation detection interval time length of two adjacent times of the same energy storage converterT 3 Satisfy T 3 ＞T。
Further, the method comprises the steps of,further comprises: setting a detection completion Flag bit Flag of each insulation impedance detection circuit, setting the Flag bit to 1 after the detection of the insulation impedance detection circuit is completed, then entering an idle state, and timing to an insulation detection interval duration T after the detection is started 3 Then, the Flag bit Flag is cleared; the Flag bit Flag is set to 0 as one of conditions for controlling the insulation resistance detection circuit to turn on detection.
The invention has the beneficial effects that: according to the invention, the time-sharing round-robin detection can be realized by utilizing the insulation impedance detection circuit and the real-time clock of the energy storage converters without adding extra hardware cost and communication links, so that the problem of protection misoperation caused by the mutual influence of insulation impedance detection of a plurality of energy storage converters is avoided.
In addition, the invention has reliable design principle, simple structure, high feasibility and very wide application prospect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
Fig. 1 is a schematic diagram of a conventional insulation resistance circuit of an energy storage converter based on an unbalanced bridge method.
Fig. 2 is a flow chart of an insulation detection time-sharing round-robin mechanism.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
As shown in FIG. 1An insulation resistance circuit based on an unbalanced bridge method is shown as conventional for energy storage converters. The insulation resistance detection circuit comprises a first relayK 1 Second relayK 2 Voltage dividing resistorR G And three voltage sampling circuits.R H AndR L the method provided by the invention is used for testing the positive ground insulation resistance and the negative ground insulation resistance.
The embodiment of the invention provides a communication-free time-sharing round-robin detection method for insulation impedance of a plurality of energy storage converters, wherein the plurality of energy storage converters are connected in parallel and are connected with an upper computer in a communication-free manner; the direct current side of each energy storage converter is provided with an insulation impedance detection circuit based on an unbalanced bridge method; executing the communication-free time-sharing round-robin detection method through an original energy storage converter control system; the method comprises the following steps:
the unification of the time reference of the built-in real-time clock module of the energy storage converter is realized through an external time synchronization source;
the real-time clock module is used for counting the minute time T, the same detection time T of each insulation impedance detection circuit is preset, and the insulation impedance detection circuits are controlled to be started to detect one by one in turn every detection time T.
According to the embodiment of the invention, the real-time clock is used as an intermediate standard, so that the converters are communicated under the condition of no communication link, the non-overlapping detection of the insulation impedance detection circuit can be realized without communication connection by a plurality of energy storage converters which are operated in parallel, and hardware facilities are not required to be added.
At present, the energy storage converters generally have the functions of real-time clock and time synchronization, and can ensure that all the energy storage converters have the same time reference. The control system of each converter can be designed with special program to continuously and alternately control the insulation resistance detection circuits to be turned on for detection one by one according to the detection time T, or can be implemented according to a simpler method provided by the following embodiment.
Optionally, as an embodiment of the present invention, the unifying of the time references of the built-in real-time clock modules of the energy storage converter is achieved through an external time synchronization source, including: acquiring a time synchronization code element signal which is sent by an external time synchronization source and comprises reference time; identifying the code element type, judging the validity of the time symbol signal according to the code element type, and checking the validity of the time symbol signal; extracting reference time of 'year, month, day, time, minute, second and millisecond' bits in the code element signal according to the code element type; and writing the same reference time into a real-time clock module built in each energy storage converter.
Specifically, the embodiment of the invention realizes time-sharing control of each control system by utilizing the real-time clock module to time, and particularly realizes the software time-setting function when the state machine is set, wherein the software time-setting function comprises a signal monitoring function, a signal analysis function and an exception handling function; the signal monitoring function comprises a control system which starts a continuous monitoring state, external time-setting code element signals are collected and stored frame by frame, and when one frame of code element is received, a signal analysis function is utilized to analyze reference time; analyzing the signal type of a code element signal, analyzing the information of each data bit according to the signal type, judging whether a received time-setting signal frame (comprising a plurality of code elements) passes the verification according to the code element type, if so, continuing to analyze, respectively extracting time information corresponding to 'year, month, day, time, minute, second and millisecond' bits, and writing the extracted time information into a real-time clock module of each energy storage converter control system to realize one-time accurate timing; if the verification is not passed, an alarm is sent out, the time setting is skipped, the next frame of time setting code element signals are collected to continue time setting, and if the verification is not passed continuously for a plurality of times, the protection locking is carried out on the signal monitoring function related relay motor.
Based on the format characteristics of the symbol signal, the information given by the "year, hour, minute, second, millisecond" bits can be directly converted into time information, but the information given by the "month, day" is "what year", "what month", and therefore, attention should be paid to the determination of the year, whether it is the young year or the flat year, and more accurate "month, day" information has been obtained.
Alternatively, as one of the present inventionIn an embodiment, the detecting circuit is controlled to turn on detection one by one every detection time T continuously and alternately, and includes: according to the current minute time T, the total number N of energy storage converters running in parallel and the detection time T, determining the next energy storage converter N to be detected, wherein the formula is as follows:n is an integer in the order of 1 to n of each energy storage converter.
Specifically, the total number of energy storage converters running in parallel is set to be N, each energy storage converter to be tested is set to be a unique code N epsilon N, namely N is an integer in the order of 1 to N of each energy storage converter, and the codes are mapped with addresses Addr of the converters one by one, so that the addresses of the converters can be found directly through the codes, and the opening of an insulation impedance detection circuit of the converters is controlled; in this embodiment, the address of the n-th energy storage converter is preset to be n-1. The current minute time t is obtained from the real-time clock module after time synchronization, and the time for detecting each insulation resistance detection circuit once in actual operation does not exceed one minute, so that the operation is convenient by taking the minute as the time granularity in time division round inspection. T is the detection time required by each insulation resistance detection circuit which is set manually, the next detection is started every T time, and the structures of the insulation resistance detection circuits are not different, so that the detection time is the same.
In the embodiment, the remaining time obtained by dividing the minute time t by the total time of one round of detection is used as the address n-1 of the next detection target, so as to obtain and further determine the next energy storage converter n to be detected; and the total time of the primary round inspection is the product of the total number N of the energy storage converters running in parallel and the detection time T.
It should be noted that the present invention does not set the detection from the first energy storage converter represented by n=1.
Optionally, as an embodiment of the present invention, further includes: presetting the measurement time length to the ground or the negative groundT 1 Presetting the switching interval duration of positive and negative earth measurementT 2 And sets up to satisfy: 2T 1 +T 2 ≤T。
Specifically, the insulation impedance detection includes two parts, namely positive and negative earth measurement, which are not performed simultaneously, and two measurement processes which are performed sequentially, and a certain time is needed in the middle for switching, and in this embodiment, the switching interval duration of the positive and negative earth measurement is set to beT 2 The method comprises the steps of carrying out a first treatment on the surface of the Thus, the total time for actually performing the primary insulation resistance test is 2T 1 +T 2 The method comprises the steps of carrying out a first treatment on the surface of the The preset detection time may be exactly the time of the actual detection or a part of the time may be reserved to prevent delay, which is longer than the time of the actual detection. The significance of the setting in this embodiment is as described above.
Optionally, as an embodiment of the present invention, further includes: presetting the insulation detection interval time length of two adjacent times of the same energy storage converterT 3 Satisfies the following conditionsT 3 ＞T。
Specifically, the insulation detection interval duration of two adjacent times of the same energy storage converterT 3 The time length of the interval between two times of round inspection of the same energy storage converter is used for avoiding the situation that the same energy storage converter is started to be inspected twice in the T time. For example, in four energy storage converters, the detection time T is set to 1 minute and 2T 1 +T 2 For 0.6 min, at t=2 min, the first test was started for n=3 converters, and after the test was completed, the time spent was 0.6 min, at t=2.8 min, the time counted after the start of the test was 0.8 min, calculated according to the above examplesIf the detection is forced, the next energy storage converter to be detected or the energy storage converter to be detected with n=3 cannot realize alternate detection, and if the detection is forced, the next energy storage converter is overlapped with the detection of the next energy storage converter. If set upT 3 After the timing of the timer to T after the start of the detection, the next converter is tested, so that no overlap is generated, e.g. T 3 If t=3.1 minutes, the time is 1.1 minutes after the start of detection, and the time reachesT 3 At this time n=4, the next station has already startedThe converter does not calculate n=1 at least in this round.
Optionally, as an embodiment of the present invention, further includes: setting a detection completion Flag bit Flag of each insulation impedance detection circuit, setting the Flag bit to 1 after the detection of the insulation impedance detection circuit is completed, then entering an idle state, and timing to an insulation detection interval duration T after the detection is started 3 Then, the Flag bit Flag is cleared; the Flag bit Flag is set to 0 as one of conditions for controlling the insulation resistance detection circuit to turn on detection.
Specifically, the invention aims to promote the insulation resistance detection of each energy storage converter not to overlap, so that the Flag bit Flag is specifically set to realize one more control, namely, whether the detection is to be started or not is determined according to the minute time t and the value of the Flag bit Flag. Further, the Flag bit Flag is valued according to the insulation detection interval duration T 3 Determining that T is reached 3 Then the detection representing the current converter ends and the detection of the next converter can begin.
The following describes embodiments of the present invention in detail by taking four energy storage converters operating in parallel as an example, in which the total number of energy storage converters connected in parallel in the embodimentN=4, the four energy storage converters are preset with respective addresses of 0,1,2 and 3, and the preset detection time T=1 minute, T 3 =2 min.
As shown in fig. 2, the energy storage converter control system should utilize the time reference of multiple energy storage converters running in parallel with a time synchronization function, precisely time with a real-time clock, and initialize all Flag bits Flag to 0.
Extracting current minute time in real time by a real-time clock module in an energy storage converter main control systemtAssuming that the current time is 20 minutes, t=20, the minute time will betDivided by the total number of unitsNTaking the rest, wherein the remainder is 0, matching with the address of the converter, determining the converter with the code n=1 as the converter to be tested, and the insulation detection completion Flag bit Flag is 0, so that the converter jump state with the code n=1 starts insulation detection. For the other three energy storage converters, the remainder 0 and the self address are not generatedMatch, thus waiting in the idle state.
The converter encoding n=1 starts insulation detection and counts:
first, the positive insulation resistance to ground is detected and the first relay is controlledK 1 Closing and second relayK 2 The first voltage sampling circuit detects the voltage to the ground, and the first voltage sampling circuit counts to the preset time length for measuring the voltage to the ground or the negative voltage to the ground after the detection is startedT 1 Then, the control system filters and averages the acquired voltage data to obtain voltageU H ：
Second step of controlling first relayK 1 Opening and second relayK 2 Disconnecting, timing and presetting the time length of the switching interval between positive and negative ground measurement after starting detectionT 2 Then, starting to detect the negative insulation resistance to the ground;
third, detecting the negative insulation resistance to the ground, and controlling the first relayK 1 Opening and second relayK 2 Closing, detecting the negative voltage to the ground by the second voltage sampling circuit, and timing to preset time length to the ground or the negative voltage to the ground after starting detectionT 1 Then, the control system filters and averages the acquired voltage data to obtain voltageU L ；
Fourth step, the voltage sampling circuit 3 detects the total voltage between positive and negative of the DC sideU bat Filtering and averaging the collected voltage data by the control system;
fifth, the positive ground impedance of the energy storage converter is calculated according to the following formulaR H And negative ground impedanceR L ：
；
In the middle ofR G For voltage dividing resistance, the resistance is connected in parallel with a fixed resistance on a positive ground and a negative ground in an insulation detection circuit, and can be formed by a first relayK 1 Opening and second relayK 2 Controlling input and exit;
sixthly, setting the insulation detection completion mark position of the converter coded as n=1 to be 1, and returning to an idle state; timing up to T after starting detection 3 After=2 minutes, the flag position is set to 0.
Seventh step, the positive ground impedance obtained by comparison and detectionR H And negative ground impedanceR L When the positive impedance to the ground or the negative impedance to the ground is lower than a first preset value, an alarm is sent; and when the positive or negative ground impedance is lower than a second preset value, protecting the latch.
For the other three energy storage converters, insulation detection is carried out according to the seven steps at 21 minutes, 22 minutes and 23 minutes at a certain time. The time for all energy storage converters to complete one round of insulation detection is 4 minutes. The energy storage converter with the number of n=1 for 24 time sharing starts insulation detection again.
The embodiment of the invention also provides a communication-free multi-machine insulation impedance time-sharing wheel inspection device of the energy storage converter, which comprises the energy storage converter device and a main control board card; the main control board card realizes the polling detection of the insulation impedance when a plurality of energy storage converters are in parallel operation by utilizing the insulation impedance detection circuit, the software time setting function and the real-time clock module, and is opposite to the ground impedanceR H And negative ground impedanceR L Display of the first and second protection preset values, insulation detection measurement durationT 1 Insulation detection measures positive and negative switching interval durationT 2 And insulation detection measurement interval durationT 3 Setting, alarming, protection blocking, etc.
Claims (6)
1. A communication-free time-sharing round-robin detection method for insulation resistance of a plurality of energy storage converters is characterized in that the energy storage converters which are operated in parallel are connected with each other and an upper computer in a communication-free manner; the direct current side of each energy storage converter is provided with an insulation impedance detection circuit based on an unbalanced bridge method; executing the communication-free time-sharing round-robin detection method through an original energy storage converter control system; the method comprises the following steps:
the unification of the time reference of the built-in real-time clock module of the energy storage converter is realized through an external time synchronization source;
the real-time clock module is used for counting the minute time T, the same detection time T of each insulation impedance detection circuit is preset, and the insulation impedance detection circuits are controlled to be started to detect one by one in turn every detection time T.
2. The method according to claim 1, wherein the unifying the time references of the built-in real-time clock modules of the energy storage converter by the external time synchronization source comprises:
acquiring a time synchronization code element signal which is sent by an external time synchronization source and comprises reference time;
identifying the code element type, judging the validity of the time symbol signal according to the code element type, and checking the validity of the time symbol signal;
extracting reference time of 'year, month, day, time, minute, second and millisecond' bits in the code element signal according to the code element type;
and writing the same reference time into a real-time clock module built in each energy storage converter.
3. The method according to claim 1, wherein the step of controlling the insulation resistance detection circuits to turn on detection one by one continuously and alternately every the detection time T comprises:
according to the current minute time T, the total number N of energy storage converters running in parallel and the detection time T, determining the next energy storage converter N to be detected, wherein the formula is as follows:n is an integer in the order of 1 to n of each energy storage converter.
4. The method as recited in claim 1, further comprising: presetting the measurement time length to the ground or the negative groundT 1 Presetting the switching interval duration of positive and negative earth measurementT 2 And sets up to satisfy: 2T 1 +T 2 ≤T。
5. The method as recited in claim 1, further comprising: presetting the insulation detection interval time length of two adjacent times of the same energy storage converterT 3 Satisfy T 3 ＞T。
6. The method as recited in claim 1, further comprising: setting a detection completion Flag bit Flag of each insulation impedance detection circuit, setting the Flag bit to 1 after the detection of the insulation impedance detection circuit is completed, then entering an idle state, and timing to an insulation detection interval duration T after the detection is started 3 Then, the Flag bit Flag is cleared; the Flag bit Flag is set to 0 as one of conditions for controlling the insulation resistance detection circuit to turn on detection.
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2024
- 2024-01-24 CN CN202410094579.6A patent/CN117607545A/en active Pending
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