CN103389436B - The switching type insulated monitoring method of DC power-supply system and system - Google Patents
The switching type insulated monitoring method of DC power-supply system and system Download PDFInfo
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Abstract
The invention provides a kind of switching type insulated monitoring method and system of DC power-supply system.According to described method first during replacing the curent change over the ground on the positive pole/negative pole circuit of the bus that switching station causes by described detector switch circuit, with three voltage sample values of the positive pole of bus described in very first time interval sampling/negative pole line-to-ground, and based on sampled three voltage-to-ground sampled values predict described positive pole/negative pole stable over the ground after magnitude of voltage; Again based on the equivalent insulation against ground resistance value that predicted magnitude of voltage correspondence is determined in described positive pole/negative pole supply line, and relatively come correspondingly to determine whether positive pole/negative pole supply line has insulation against ground fault according to determined equivalent insulation against ground resistance value and predetermined threshold value.The present invention by fast prediction during curent change over the ground go out both positive and negative polarity circuit stablize after voltage-to-ground, supervision that can be real-time is to the circuit of the insulation against ground fault in the both positive and negative polarity circuit of the bus of straight-flow system.
Description
Technical field
The present invention relates to a kind of monitoring method of DC power-supply system, particularly relate to a kind of switching type insulated monitoring method and system of DC power-supply system.
Background technology
DC power-supply system (HVDC system) is as the novel power supply of modern Internet data center (IDC) communications equipment room, charging system of electric powercar, a huge multiple-limb supply network, employing be suspend, non-security DC voltage (being generally 240V or 336V).In application process, the insulation fault most with potential safety hazard is single-point grounding or one pole insulation decline fault.Single-point grounding or one pole insulation decline and sometimes can not affect the normal operation of HVDC system, there is disguise, if but can not earth fault be found rapidly and be repaired, just may cause personal safety accident to user, once generation pole ground fault, just will cause HVDC system power supply fault, affect the continuity of whole electric power system.
Therefore, current HVDC system is equipped with the type insulation monitoring system of insulation fault usually, in order to accurately identify the insulation against ground resistance of any ratio of HVDC system busbar both positive and negative polarity more comprehensively, be respectively equipped with in described type insulation monitoring system and the positive pole of the bus in HVDC system and negative pole insulation monitoring and warning device over the ground, described insulation monitoring and warning device monitors positive pole/negative pole insulation resistance over the ground according to the alternately opening and closing of detector switch wherein, more whether positive pole/negative pole the circuit determining bus according to measured insulation against ground resistance has insulation against ground potential safety hazard.
But, because the both positive and negative polarity equivalent capacity over the ground of the bus in DC power-supply system may be very large, therefore, when detector switch circuit replaces opening and closing at every turn, the voltage-to-ground of the negative or positive electrode circuit of bus, in fact be exactly the charge or discharge voltage of bus negative or positive electrode equivalent capacity over the ground, need certain hour could be final stable.According to test, the 30 seconds at most time of above-mentioned discharge and recharge, even more than 1 minute.It is accurate that current type insulation monitoring system will be monitored, need the insulation against ground resistance again on measuring and calculation circuit after each detector switch opening and closing voltage stabilization, which prevent the monitoring efficiency of type insulation monitoring system, meanwhile, can not potential safety hazard over the ground on Timeliness coverage circuit.Therefore, need to improve existing type insulation monitoring system.
Summary of the invention
The shortcoming of prior art in view of the above, the object of the present invention is to provide a kind of switching type insulated monitoring method and system of DC power-supply system, for solving monitoring insulation hidden danger problem not in time in prior art.
For achieving the above object and other relevant objects, the invention provides a kind of switching type insulated monitoring method of DC power-supply system, wherein, described DC power-supply system comprises bus, the both positive and negative polarity of described bus is respectively equipped with the circuit of detector switch over the ground of alternately opening and closing, described monitoring method at least comprises: 1) during replacing the curent change over the ground on the positive pole/negative pole circuit of the bus that switching station causes by described detector switch circuit, with three voltage sample values of the positive pole of bus described in very first time interval sampling/negative pole line-to-ground, and based on sampled three voltage-to-ground sampled values predict described positive pole/negative pole stable over the ground after magnitude of voltage, 2) the magnitude of voltage correspondence after stable over the ground based on predicted positive pole/negative pole determines the equivalent insulation against ground resistance value in described positive pole/negative pole supply line, and relatively comes correspondingly to determine whether positive pole/negative pole supply line has insulation against ground fault according to the equivalent insulation against ground resistance value in determined positive pole/negative pole supply line and predetermined threshold value.
Preferably, described step 1) also comprises: during curent change over the ground, to sample successively positive pole/negative pole three groups of voltage sample values over the ground of described bus based on the very first time interval of presetting, wherein, often organize in voltage sample value and comprise with the sampling of second time interval and the identical multiple voltage sample values of quantity; From often organizing voltage sample value three the voltage sample values chosen respectively and be spaced apart described very first time interval, and according to a magnitude of voltage after over the ground stable of positive pole/negative pole described in selected three voltage sample value predictions, repeat this step, to dope the multiple magnitudes of voltage after stablizing over the ground; Predicted multiple voltage-to-ground values are carried out filtration treatment, to obtain described positive pole/negative pole final magnitude of voltage over the ground.
Preferably, described step 1) comprises: utilize formula
predict described positive pole/negative pole stable over the ground after magnitude of voltage, wherein, Ue be prediction stable after voltage-to-ground value, U'
1, U'
2, U'
3be followed successively by the voltage-to-ground sampled value with very first time interval.
Preferably, the mode that magnitude of voltage after stablizing predicted many groups over the ground in described step 1) carries out filtration treatment comprises: reject magnitude of voltage obviously abnormal in the multiple magnitudes of voltage obtained, be averaged remaining multiple magnitude of voltage calculating again, with obtain predicting stable over the ground after magnitude of voltage.
Preferably, in execution step 2) before, described method also comprises: the magnitude of voltage after 3) stable over the ground according to predicted positive pole and negative pole determines corresponding line-to-ground whether short circuit or open circuit.
Preferably, if to determine in described step 3) in positive pole and negative pole circuit, one for shorted to earth, described step 2) also comprise: based on the equivalent insulation against ground resistance value in the voltage-to-ground determination respective lines on the circuit of predicted not short circuit over the ground, again according to calculated equivalent insulation against ground resistance value and described threshold value compare determine described in the circuit of not short circuit whether have insulation against ground fault, and determine that the circuit of shorted to earth is insulation against ground fault.
Preferably, if determine in described step 3), in positive pole and negative pole circuit, at least one is for open a way over the ground, described step 2) also comprise: based on the equivalent insulation against ground resistance value in the voltage-to-ground determination respective lines on the predicted circuit of not opening a way over the ground, then according to calculated equivalent insulation against ground resistance value and described threshold value compare determine described in the circuit of not opening a way whether have insulation against ground fault.
Based on above-mentioned purpose, the present invention also provides a kind of switching type type insulation monitoring system of DC power-supply system, wherein, described DC power-supply system comprises bus, and described type insulation monitoring system at least comprises: on the both positive and negative polarity being separately positioned on described bus and the circuit of detector switch over the ground of alternately opening and closing; Prediction module, for during replacing the curent change over the ground on the positive pole/negative pole circuit of the bus that switching station causes by described detector switch circuit, with three voltage sample values of the positive pole/negative pole line-to-ground of bus described in very first time interval quick sampling, and based on sampled three voltage-to-ground sampled values predict described positive pole/negative pole stable over the ground after magnitude of voltage; Insulating monitoring module, final magnitude of voltage correspondence after positive pole/negative pole of predicting based on described prediction module is stable over the ground determines the equivalent insulation against ground resistance value in described positive pole/negative pole supply line, and relatively comes correspondingly to determine whether positive pole/negative pole supply line has insulation against ground fault according to the equivalent insulation against ground resistance value in determined positive pole/negative pole supply line and predetermined threshold value.
Preferably, described prediction module also comprises: predicted voltage calculating sub module, for during curent change over the ground, to sample successively positive pole/negative pole three groups of voltage sample values over the ground of described bus based on the very first time interval of presetting, wherein, often organize in voltage sample value and comprise with the sampling of second time interval and the identical multiple voltage sample values of quantity; Predicted voltage calculating sub module, for from often organizing in voltage sample value three the voltage sample values chosen respectively and be spaced apart described very first time interval, and according to a magnitude of voltage after over the ground stable of positive pole/negative pole described in selected three voltage sample value predictions, repeat described predicted voltage calculating sub module, to dope the multiple magnitudes of voltage after stablizing over the ground; Predicted voltage filters mould module, for predicted each magnitude of voltage is carried out filtration treatment, with obtain described positive pole/negative pole stable over the ground after magnitude of voltage.
Preferably, described prediction module is sampled when described detector switch circuit replaces opening and closing positive pole/negative pole three voltage sample values over the ground of described bus, and utilizes formula
predict described positive pole/negative pole stable over the ground after magnitude of voltage, wherein, Ue be prediction stable after voltage-to-ground value, U'
1, U'
2, U'
3be followed successively by with three of very first time interval voltage-to-ground sampled values.
Preferably, described predicted voltage filters mould module for rejecting magnitude of voltage obviously abnormal in obtained multiple magnitudes of voltage, then calculatings that is averaged by remaining multiple magnitude of voltage, with obtain predicting stablize over the ground after magnitude of voltage.
Preferably, described type insulation monitoring system also comprises: the judge module between described prediction module and insulating monitoring module, determines corresponding line-to-ground whether short circuit or open circuit for the magnitude of voltage after stable over the ground according to predicted positive pole and negative pole.
Preferably, if one is shorted to earth in described judge module determination positive pole and negative pole circuit, equivalent insulation against ground resistance value in the voltage-to-ground determination respective lines of described insulating monitoring module also on the circuit based on predicted not short circuit over the ground, again according to calculated equivalent insulation against ground resistance value and described threshold value compare determine described in the circuit of not short circuit whether have insulation against ground fault, and determine that the circuit of shorted to earth is insulation against ground fault.
Preferably, if at least one is for open a way over the ground in described judge module determination positive pole and negative pole circuit, described insulating monitoring module also for based on the equivalent insulation against ground resistance value in the voltage-to-ground determination respective lines on the predicted circuit of not opening a way over the ground, then according to calculated equivalent insulation against ground resistance value and described threshold value compare determine described in the circuit of not opening a way whether have insulation against ground fault.
As mentioned above, the switching type insulated monitoring method of DC power-supply system of the present invention and system, there is following beneficial effect: by fast prediction during curent change over the ground go out both positive and negative polarity circuit stablize after voltage-to-ground, effectively save the time waiting for current stabilization over the ground, insulation against ground situation in the both positive and negative polarity circuit of the bus of supervision straight-flow system that can be real-time, the circuit of Timeliness coverage insulation against ground fault; In addition, the many groups of sampling three voltage-to-ground sampled values during curent change over the ground, and utilize each group of three voltage-to-ground sampled values to dope multiple voltage-to-ground value, then filtration treatment is carried out to predicted final voltage-to-ground value, more final voltage-to-ground value can be predicted; In addition, often the sampling interval organized between three times is set to 100ms, sampling interval often in group is set to 1-2ms, make many groups three voltage-to-ground sampled values of can sampling within 1-2s, then utilize the voltage-to-ground value of sampling to carry out the prediction of final stable rear magnitude of voltage over the ground, the monitoring efficiency of the insulation fault of about 90% can be improved.
Accompanying drawing explanation
Fig. 1 is shown as the process flow diagram of the switching type insulated monitoring method of DC power-supply system of the present invention.
Fig. 2 is shown as the structural representation of a kind of optimal way of the switching type insulating monitoring circuit of DC power-supply system of the present invention.
Fig. 3 is shown as the structural representation of the switching type type insulation monitoring system of DC power-supply system of the present invention.
Element numbers explanation
1 type insulation monitoring system
11 positive poles are detector switch circuit over the ground
12 negative poles are detector switch circuit over the ground
13 prediction module
14 insulating monitoring modules
15 insulating monitoring unit
S1 ~ S2 step
Embodiment
Below by way of specific instantiation, embodiments of the present invention are described, those skilled in the art the content disclosed by this instructions can understand other advantages of the present invention and effect easily.The present invention can also be implemented or be applied by embodiments different in addition, and the every details in this instructions also can based on different viewpoints and application, carries out various modification or change not deviating under spirit of the present invention.
As shown in Figure 1, the invention provides a kind of switching type insulated monitoring method of DC power-supply system.Wherein, described DC power-supply system comprises bus.Described monitoring method performs primarily of type insulation monitoring system, described type insulation monitoring system comprises: on the both positive and negative polarity being separately positioned on described bus and the circuit of detector switch over the ground of alternately opening and closing, and control the opening and closing of described detector switch circuit and monitor the insulating monitoring unit of the positive pole of described bus and the insulation against ground performance of negative pole, wherein, described insulating monitoring unit is the application etc. be arranged in computer equipment.This computer equipment be a kind of can according to the program stored in advance, automatically the modernization intelligent electronic device of massive values computation and various information processing, is carried out at high speed, and the duty of described detector switch circuit can be controlled, its hardware includes but not limited to server, embedded device, industrial computer etc.
In step sl, described insulating monitoring unit is during replacing the curent change over the ground on the positive pole/negative pole circuit of the bus that switching station causes by the described circuit of detector switch over the ground, with three voltage sample values of the positive pole of bus described in very first time interval sampling/negative pole line-to-ground, and based on sampled three voltage-to-ground sampled values predict described positive pole/negative pole stable over the ground after magnitude of voltage.
Particularly, under the control of described insulating monitoring unit, the positive pole detector switch closing of circuit of bus, negative pole detector switch circuit disconnects, now, positive pole-the ground path of very first time interval to described bus that described insulating monitoring unit starts according to presetting carries out voltage sample, obtains three thus for monitoring the voltage sample value of positive pole-ground path; Similarly, described insulating monitoring unit bus positive pole over the ground detector switch circuit disconnect and negative pole over the ground detector switch closing of circuit time, carry out voltage sample according to the negative pole-ground path of very first time interval to described bus preset, and obtain three for monitoring the voltage sample value of negative pole-ground path.Described very first time interval at least 100ms.
Preferably, according to capacitor charge and discharge formula:
visible, magnitude of voltage Ue after the positive pole/negative pole wanting to predict bus over the ground stable, except t positive pole/negative pole voltage sample value Ut over the ground can be recorded, also need to know positive pole/negative pole initial voltage value Uo over the ground, equivalent capacity discharge and recharge equivalent time constant RC before detector switch circuit opening and closing over the ground, wherein, R is positive pole/negative pole equivalent insulation resistance over the ground, and C is positive pole/negative pole equivalent capacity over the ground.Therefore, in order to determine initial voltage-to-ground value Uo, sampling instant t and equivalent time constant RC, described step 1) needs to sample successively based on the very first time interval positive pole/negative pole three voltage sample value U' over the ground of described bus
1, U'
2, U'
3.
Wherein,
Wherein, t
1for the moment of first time sampling, Δ t is the very first time interval of sampling.Described insulating monitoring unit utilizes U'
1, U'
2, U'
3computing formula group, the voltage prediction value after the positive pole/negative pole obtaining described bus is stable is over the ground:
Wherein, Ue is the voltage-to-ground value after stablizing of prediction.
As a kind of preferred version, described step S1 also comprises: step S11, step S12 and step S13(all do not give diagram).
In step s 11, described insulating monitoring unit is during curent change over the ground, to sample successively positive pole/negative pole three groups of voltage sample values over the ground of described bus based on the very first time interval of presetting, wherein, often organize in voltage sample value and comprise: with second time interval sampling preset and the equal multiple voltage sample values of quantity.Wherein, described second time interval is excellent at 1-2ms.Non-overlapping sampled value in the described voltage sample value of adjacent sets.
Such as, described insulating monitoring unit monitors detector switch circuit when alternately changing, in the t1 moment, with Δ t
2the time interval (described second time interval) sample positive pole described in a group/negative pole line-to-ground voltage sample value U1 ' ' u11, u12 ..., u1m}, then, with described t1 time at intervals Δ t
1the t2 moment at interval (described very first time interval), the voltage sample value U2 ' ' of positive pole described in a group/negative pole line-to-ground of sampling u21, u22 ..., u2m}, and with described t2 time at intervals Δ t
1the t3 moment at interval (described very first time interval), then the voltage sample value U3 ' ' of positive pole described in a group/negative pole line-to-ground of sampling { u31, u32 ..., u3m}, wherein, m is the quantity often organizing sampling, Δ t
1>> Δ t
2.
In step s 12, described insulating monitoring unit is from often organizing voltage sample value three the voltage sample values chosen respectively and be spaced apart described very first time interval, and according to a magnitude of voltage after over the ground stable of positive pole/negative pole described in selected three voltage sample value predictions, repeat this step, to dope the multiple magnitudes of voltage after stablizing over the ground.
Continue the example in step S11, described insulating monitoring unit respectively chooses a voltage sample value u11, u21, u31 successively from U1 ' ', U2 ' ', U3 ' ' voltage sample value group, and the interval of three selected voltage sample values is Δ t
1, then, predict a magnitude of voltage after described positive pole/negative pole over the ground stable according to the mode in described step S1.Repeat step S12, described insulating monitoring unit chooses u12, u22, u32 from U1 ' ', U2 ' ', U3 ' ', and predict accordingly another stable over the ground after magnitude of voltage.By that analogy, m the magnitude of voltage of described insulating monitoring unit after to dope in respective lines over the ground stable.
Unceasingly, in step s 13, predicted multiple magnitudes of voltage are carried out filtration treatment by described insulating monitoring unit, with obtain described positive pole/negative pole stable over the ground after magnitude of voltage.
Particularly, described insulating monitoring unit obtained multiple magnitudes of voltage are averaged value calculate, with determine predict magnitude of voltage.
Preferably, described insulating monitoring unit rejects magnitude of voltage obviously abnormal in the multiple magnitudes of voltage obtained, then the calculating that is averaged by remaining multiple magnitude of voltage, to obtain the final voltage-to-ground value predicted.
Wherein, the mode that described insulating monitoring unit to reject in the multiple magnitudes of voltage obtained obviously abnormal magnitude of voltage includes but not limited to: 1) remove the maximal value in obtained multiple magnitudes of voltage and minimum value.2) utilize the probability distribution computing formula preset, determine to be in the magnitude of voltage in small probability distribution range, and the magnitude of voltage be in small probability distribution range is rejected.
In step s 2, magnitude of voltage correspondence after described insulating monitoring unit is stable over the ground based on predicted positive pole/negative pole determines the equivalent insulation against ground resistance value in described positive pole/negative pole supply line, and relatively comes correspondingly to determine whether positive pole/negative pole supply line has insulation against ground fault according to the equivalence insulation resistance to earth value in determined positive pole/negative pole supply line and predetermined threshold value.
Particularly, described insulating monitoring unit records the magnitude of voltage U on bus between both positive and negative polarity in advance, recycling formula
and
calculate the resistance of the equivalent insulation against ground resistance value on positive pole, negative pole circuit respectively, again the equivalent insulation against ground resistance value on calculated positive pole and negative pole circuit and the threshold value preset are compared, if be less than described threshold value, export the warning message of the insulation against ground sexual abnormality in respective lines.Wherein, U1 is the voltage after stablizing over the ground according to the positive pole of step S1 prediction, and U2 is the voltage after stablizing over the ground according to the negative pole of step S2 prediction, and R is the known resistance in the circuit of detector switch over the ground of both positive and negative polarity.
For circuit shown in Fig. 2, switch S 1, S2, S3, S4 and resistance R1, R2, R3 forms bus both positive and negative polarity detector switch circuit over the ground, described insulating monitoring unit controls Closing Switch S1, S2, cut-off switch S3, S4, and the magnitude of voltage U recorded on bus between both positive and negative polarity, control Closing Switch S1 again, S4, cut-off switch S2, S3, the magnitude of voltage after bus positive pole over the ground stable is predicted according to step S1, control Closing Switch S2, S3, cut-off switch S1, S4, the magnitude of voltage after bus negative pole over the ground stable is predicted according to step S1, then, described insulating monitoring unit is according to the layout of circuit, to formula
And
Be out of shape, obtain
then, the R will obtained
+and R
-compare, if R with the threshold value preset respectively
+and R
-arbitraryly be less than described threshold value, then determine R
+and R
-there is insulation against ground fault in the circuit at place, described insulating monitoring unit sends respective lines insulation against ground failure warning information immediately.
Especially, described insulating monitoring unit also performed step S3(and does not give diagram before execution step S2).
In step s3, described insulating monitoring unit determines corresponding line-to-ground whether short circuit or open circuit according to predicted positive pole and negative pole voltage-to-ground value.
Particularly, whether there is one of them value in the positive pole voltage-to-ground value that described insulating monitoring unit judges is predicted and negative pole voltage-to-ground value and be less than short-circuit threshold value and the difference of magnitude of voltage between another value and the n-negative pole circuit recorded is less than a preset value, if exist, then determine that the circuit that voltage-to-ground value is less than described short-circuit threshold value is in shorted to earth state; If there is one of them value to be less than short-circuit threshold value and the difference of magnitude of voltage between another value and the n-negative pole circuit recorded is more than or equal to this preset value, then determine that the circuit that voltage-to-ground value is less than described short-circuit threshold value is in open-circuit condition over the ground; Otherwise the positive pole voltage-to-ground value predicted if judge and negative pole voltage-to-ground value do not belong to above-mentioned two situations, then directly proceed to step S2.
If to determine in described step S3 in positive pole and negative pole circuit, one for shorted to earth, then described step S2 also comprises:
Step S21: described insulating monitoring unit is based on the equivalent insulation against ground resistance value in the voltage-to-ground determination respective lines on the circuit of predicted not short circuit over the ground, again according to calculated equivalent insulation against ground resistance value and described threshold value compare determine described in the circuit of not short circuit whether have insulation against ground fault, and determine that the circuit of shorted to earth is insulation against ground fault.
If determine in described step S3, in positive pole and negative pole circuit, at least one is for open a way over the ground, and described step S2 also comprises:
Step S21: described insulating monitoring unit based on the equivalent insulation against ground resistance value in the voltage-to-ground determination respective lines on the predicted circuit of not opening a way over the ground, then according to calculated equivalent insulation against ground resistance value and described threshold value compare determine described in the circuit of not opening a way whether have insulation against ground fault.
Wherein, it should be noted that, it should be appreciated by those skilled in the art that described insulating monitoring unit calculates the mode calculating respective lines equivalent insulating resistance value over the ground in the mode of respective lines equivalent insulating resistance value over the ground and abovementioned steps S2 same or similar, be not described in detail in this.
Also it should be noted that, it should be appreciated by those skilled in the art that described step S21 and step S22 and discontinuous execution, but select an execution according to the magnitude of voltage of predicted positive/negative line-to-ground.
As shown in Figure 3, the present invention also provides a kind of switching type type insulation monitoring system of DC power-supply system, wherein, described type insulation monitoring system comprises: on the both positive and negative polarity being separately positioned on described bus and the circuit of detector switch over the ground 11,12 of alternately opening and closing, and on-off circuit 11,12 opening and closing monitor the insulating monitoring unit 15 of the positive pole of described bus and the insulation against ground performance of negative pole over the ground described in controlling.Described insulating monitoring unit 15 comprises: prediction module 13 and insulating monitoring module 14.
Described prediction module 13 is for during replacing the curent change over the ground on the positive pole/negative pole circuit of the bus that switching station causes by the described circuit of detector switch over the ground 11,12, with three voltage sample values of the positive pole of bus described in very first time interval sampling/negative pole line-to-ground, and based on sampled three voltage-to-ground sampled values predict described positive pole/negative pole stable over the ground after magnitude of voltage.
Particularly, under the control of described insulating monitoring unit 15, detector switch circuit 11 is closed over the ground for the positive pole of bus, negative pole over the ground detector switch circuit 12 disconnects, now, positive pole-the ground path of very first time interval to described bus that described prediction module 13 starts according to presetting carries out voltage sample, obtains one group thus for monitoring the voltage sample value of positive pole-ground path; Similarly, described prediction module 13 bus positive pole over the ground detector switch circuit 11 disconnect and negative pole detector switch circuit 12 closes over the ground time, carry out voltage sample according to the negative pole-ground path of very first time interval to described bus preset, and obtain one group for monitoring the voltage sample value of negative pole-ground path.Wherein, the quantity of one group of voltage sample value is three.Described very first time interval at least 100ms.
Preferably, according to capacitor charge and discharge formula:
visible, want the positive pole/negative pole stable magnitude of voltage Ue over the ground predicting bus, except t positive pole/negative pole voltage sample value Ut over the ground can be recorded, also need to know positive pole/negative pole initial voltage value Uo over the ground, equivalent capacity discharge and recharge equivalent time constant RC before detector switch circuit 11,12 opening and closing over the ground, wherein, R is positive pole/negative pole equivalent insulation resistance over the ground, and C is positive pole/negative pole equivalent capacity over the ground.Therefore, in order to determine initial voltage value Uo, sampling instant t and equivalent time constant RC, described prediction module 13 needs to sample successively based on the very first time interval positive pole/negative pole three voltage sample value U' over the ground of described bus
1, U'
2, U'
3.
Wherein,
Wherein, t
1for the moment of first time sampling, Δ t is the very first time interval of sampling.Described insulating monitoring unit 15 utilizes U'
1, U'
2, U'
3computing formula group, the voltage prediction value after the positive pole/negative pole obtaining described bus is stable is over the ground:
Wherein, Ue is the voltage-to-ground value after stablizing of prediction.
As a kind of preferred version, described prediction module 13 also comprises: voltage sample submodule, predicted voltage calculating sub module and predicted voltage filter mould module (all not giving diagram).
Described voltage sample submodule is used for during curent change over the ground, to sample successively positive pole/negative pole three groups of voltage sample values over the ground of described bus based on the very first time interval of presetting, wherein, often organize in voltage sample value and comprise with the sampling of second time interval and the identical multiple voltage sample values of quantity.Wherein, described second time interval is excellent at 1-2ms.Non-overlapping sampled value in the described voltage sample value of adjacent sets.
Such as, described voltage sample submodule monitors detector switch circuit when alternately changing, in the t1 moment, with Δ t
2the time interval (described second time interval) sample positive pole described in a group/negative pole line-to-ground voltage sample value U1 ' ' u11, u12 ..., u1m}, then, with described t1 time at intervals Δ t
1the t2 moment at interval (described very first time interval), the voltage sample value U2 ' ' of positive pole described in a group/negative pole line-to-ground of sampling u21, u22 ..., u2m}, and with described t2 time at intervals Δ t
1the t3 moment at interval (described very first time interval), then the voltage sample value U3 ' ' of positive pole described in a group/negative pole line-to-ground of sampling { u31, u32 ..., u3m}, wherein, m is the quantity often organizing sampling, Δ t
1>> Δ t
2.
Described predicted voltage calculating sub module is used for from often organizing voltage sample value three the voltage sample values chosen respectively and be spaced apart described very first time interval, and according to a magnitude of voltage after over the ground stable of positive pole/negative pole described in selected three voltage sample value predictions, repeat described predicted voltage calculating sub module, to dope the multiple magnitudes of voltage after stablizing over the ground.
Continue the example in described voltage sample submodule, described predicted voltage calculating sub module respectively chooses a voltage sample value u11, u21, u31 successively from U1 ' ', U2 ' ', U3 ' ' voltage sample value group, and the interval of three selected voltage sample values is Δ t
1, then, predict a magnitude of voltage after described positive pole/negative pole over the ground stable according to the mode described in described prediction module 13.Repeat described predicted voltage calculating sub module, described predicted voltage calculating sub module chooses u12, u22, u32 from U1 ' ', U2 ' ', U3 ' ', and predict accordingly another stable over the ground after magnitude of voltage.By that analogy, m the magnitude of voltage of described predicted voltage calculating sub module after to dope in respective lines over the ground stable.
Unceasingly, described predicted voltage is filtered mould module and is used for predicted multiple magnitudes of voltage to carry out filtration treatment, with obtain described positive pole/negative pole stable over the ground after voltage-to-ground value.
Particularly, described predicted voltage is filtered the mould module value that is averaged by obtained multiple magnitudes of voltage and is calculated, to determine the magnitude of voltage of prediction.
Preferably, described predicted voltage filters mould module for rejecting magnitude of voltage obviously abnormal in obtained multiple magnitudes of voltage, then calculatings that is averaged by remaining multiple magnitude of voltage, with obtain predicting stablize after magnitude of voltage.
Wherein, the mode that described predicted voltage filtration mould module rejects magnitude of voltage obviously abnormal in the multiple magnitudes of voltage obtained includes but not limited to: 1) remove the maximal value in obtained multiple magnitudes of voltage and minimum value.2) utilize the probability distribution computing formula preset, determine to be in the magnitude of voltage in small probability distribution range, and the magnitude of voltage be in small probability distribution range is rejected.
The magnitude of voltage correspondence of described insulating monitoring module 14 after stable over the ground based on predicted positive pole/negative pole determines the equivalent insulation against ground resistance value in described positive pole/negative pole supply line, and relatively comes correspondingly to determine whether positive pole/negative pole supply line has insulation against ground fault according to the equivalent insulation against ground resistance value in determined positive pole/negative pole supply line and predetermined threshold value.
Particularly, described insulating monitoring module 14 records the magnitude of voltage U on bus between both positive and negative polarity in advance, recycling formula
and
calculate the resistance of the equivalent insulation against ground resistance value on positive pole, negative pole circuit respectively, again the equivalent insulation against ground resistance value on calculated positive pole and negative pole circuit and the threshold value preset are compared, if be less than described threshold value, export the warning message of the insulation against ground sexual abnormality in respective lines.Wherein, U1 is the voltage after the positive pole of prediction is stablized over the ground, and U2 is the voltage after the negative pole of prediction is stablized over the ground, and R is the known resistance in the circuit of detector switch over the ground 11,12 of both positive and negative polarity.
For circuit shown in Fig. 2, switch S 1, S2, S3, S4 and resistance R1, R2, R3 forms bus both positive and negative polarity detector switch circuit 11 over the ground, 12, described monitoring means 15 controls Closing Switch S1, S2, cut-off switch S3, S4, and the magnitude of voltage U recorded on bus between both positive and negative polarity, control Closing Switch S1 again, S4, cut-off switch S2, S3, the magnitude of voltage after bus positive pole over the ground stable is predicted by described prediction module 13, control Closing Switch S2, S3, cut-off switch S1, S4, bus negative pole stable rear magnitude of voltage is over the ground predicted by described prediction module 13, then, described insulating monitoring module 14 is according to the layout of circuit, to formula
And
Be out of shape, obtain
Then, the R will obtained
+and R
-compare, if R with the threshold value preset respectively
+and R
-arbitraryly be less than described threshold value, then determine R
+and R
-there is insulation against ground fault in the circuit at place, described insulating monitoring unit 15 sends respective lines insulation against ground failure warning information immediately.
Especially, described insulating monitoring unit 15 also comprises: judge module (not giving diagram).
Described judge module between described prediction module 13 and insulating monitoring module 14, for determining corresponding line-to-ground whether short circuit or open circuit according to predicted positive pole and negative pole voltage-to-ground value.
Particularly, described judge module judges whether to exist in the positive pole voltage-to-ground value predicted and negative pole voltage-to-ground value one of them value and is less than short-circuit threshold value and the difference of magnitude of voltage between another value and the n-negative pole circuit recorded is less than a preset value, if exist, then determine that the circuit that magnitude of voltage is less than described short-circuit threshold value is in shorted to earth state; If there is one of them value to be less than short-circuit threshold value and the difference of magnitude of voltage between another value and the n-negative pole circuit recorded is more than or equal to this preset value, then determine that the circuit that magnitude of voltage is less than described short-circuit threshold value is in open-circuit condition over the ground; Otherwise the cathode voltage value predicted if judge and negative battery voltage do not belong to above-mentioned two situations, then directly proceed to insulating monitoring module 14.
If one is shorted to earth in described judge module determination positive pole and negative pole circuit, equivalent insulation against ground resistance value then in the voltage-to-ground determination respective lines of described insulating monitoring module 14 also on the circuit based on predicted not short circuit over the ground, again according to calculated equivalent insulation against ground resistance value and described threshold value compare determine described in the circuit of not short circuit whether have insulation against ground fault, and determine that the circuit of short circuit is insulation fault.
If at least one is for open a way over the ground in described judge module determination positive pole and negative pole circuit, described insulating monitoring module 14 also for based on the equivalent insulation against ground resistance value in the voltage-to-ground determination respective lines on the predicted circuit of not opening a way over the ground, then according to calculated equivalent insulation against ground resistance value and described threshold value compare determine described in the circuit of not opening a way whether have insulation against ground fault.
Wherein, it should be noted that, those skilled in the art should understand that, it is same or similar that described insulating monitoring module 14 calculates the mode calculating respective lines equivalent insulating resistance value over the ground in the mode of respective lines equivalent insulating resistance value over the ground and aforementioned dielectric monitoring modular 14, is not described in detail in this.
Also it should be noted that, it should be appreciated by those skilled in the art that when exist shorted to earth circuit or over the ground open circuit line time, described insulating monitoring module selects an execution according to the magnitude of voltage of predicted positive/negative line-to-ground.
In sum, the switching type insulated monitoring method of DC power-supply system of the present invention and system, by fast prediction during curent change over the ground go out both positive and negative polarity circuit stablize after voltage-to-ground, effectively save the time waiting for current stabilization over the ground, the insulation status of the both positive and negative polarity line-to-ground of the bus of supervision straight-flow system that can be real-time, the circuit of Timeliness coverage insulation against ground fault; In addition, the many groups of sampling three voltage-to-ground sampled values during curent change over the ground, and utilize each group of three voltage-to-ground sampled values dope multiple stable over the ground after magnitude of voltage, again to predicted stable over the ground after magnitude of voltage carry out filtration treatment, can predict more final stable over the ground after magnitude of voltage; In addition, the sampling interval of three groups is set to 100ms, sampling interval often in group is set to 1-2ms, make three groups of voltage-to-ground sampled values that can obtain very first time interval within 1-2s, the prediction of the magnitude of voltage after then utilizing the voltage-to-ground value of sampling to stablize over the ground, can improve the monitoring efficiency of the insulation fault of about 90%.So the present invention effectively overcomes various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all without prejudice under spirit of the present invention and category, can modify above-described embodiment or changes.Therefore, such as have in art usually know the knowledgeable do not depart from complete under disclosed spirit and technological thought all equivalence modify or change, must be contained by claim of the present invention.
Claims (14)
1. a switching type insulated monitoring method for DC power-supply system, wherein, described DC power-supply system comprises bus, the both positive and negative polarity of described bus is respectively equipped with the circuit of detector switch over the ground of alternately opening and closing, it is characterized in that, at least comprise:
1) during replacing the curent change over the ground on the positive pole/negative pole circuit of the bus that switching station causes by described detector switch circuit, with three voltage sample values of the positive pole of bus described in very first time interval sampling/negative pole line-to-ground, and based on sampled three voltage-to-ground sampled values predict described positive pole/negative pole stable over the ground after magnitude of voltage;
2) the magnitude of voltage correspondence after stable over the ground based on predicted positive pole/negative pole determines the equivalent insulation against ground resistance value in described positive pole/negative pole supply line, and relatively comes correspondingly to determine whether positive pole/negative pole supply line has insulation against ground fault according to the equivalent insulation against ground resistance value in determined positive pole/negative pole supply line and predetermined threshold value.
2. the switching type insulated monitoring method of DC power-supply system according to claim 1, is characterized in that, described step 1) also comprise:
During curent change over the ground, to sample successively positive pole/negative pole three groups of voltage sample values over the ground of described bus based on the very first time interval of presetting, wherein, often organize in voltage sample value and comprise: with second time interval sampling preset and the equal multiple voltage sample values of quantity;
From often organizing voltage sample value three the voltage sample values chosen respectively and be spaced apart described very first time interval, and according to a magnitude of voltage after over the ground stable of positive pole/negative pole described in selected three voltage sample value predictions, repeat this step, to dope the multiple magnitudes of voltage after stablizing over the ground;
Predicted each magnitude of voltage is carried out filtration treatment, with obtain described positive pole/negative pole stable over the ground after magnitude of voltage.
3. the switching type insulated monitoring method of DC power-supply system according to claim 1 and 2, is characterized in that, described step
1) comprising: utilize formula
predict described positive pole/negative pole stable over the ground after magnitude of voltage, wherein, Ue be prediction stable after voltage-to-ground value, U'
1, U'
2, U'
3be followed successively by with the voltage-to-ground sampled value of described very first time interval sampling.
4. the switching type insulated monitoring method of DC power-supply system according to claim 2, it is characterized in that, described step 1) in stable over the ground by predicted many groups after the magnitude of voltage mode of carrying out filtration treatment comprise: reject magnitude of voltage obviously abnormal in the multiple magnitudes of voltage obtained, be averaged remaining multiple magnitude of voltage calculating again, with obtain predicting stable over the ground after magnitude of voltage.
5. the switching type insulated monitoring method of DC power-supply system according to claim 1, it is characterized in that, in execution step 2) before, described method also comprises: 3) determine corresponding line-to-ground whether short circuit or open circuit according to predicted positive pole and negative pole voltage-to-ground value.
6. the switching type insulated monitoring method of DC power-supply system according to claim 5, it is characterized in that, if in described step 3) in determine in positive pole and negative pole circuit that one for shorted to earth, described step 2) also comprise: based on the equivalent insulation against ground resistance value in the voltage-to-ground determination respective lines on the circuit of predicted not short circuit over the ground, again according to calculated equivalent insulation against ground resistance value and described threshold value compare determine described in the circuit of not short circuit whether have insulation against ground fault, and determine that the circuit of shorted to earth is insulation against ground fault.
7. the switching type insulated monitoring method of DC power-supply system according to claim 5, it is characterized in that, if in described step 3) in determine that in positive pole and negative pole circuit, at least one is for open a way over the ground, described step 2) also comprise: based on the equivalent insulation against ground resistance value in the voltage-to-ground determination respective lines on the predicted circuit of not opening a way over the ground, then according to calculated equivalent insulation against ground resistance value and described threshold value compare determine described in the circuit of not opening a way whether have insulation against ground fault.
8. a switching type type insulation monitoring system for DC power-supply system, wherein, described DC power-supply system comprises bus, it is characterized in that, described type insulation monitoring system at least comprises:
On the both positive and negative polarity being separately positioned on described bus and the detector switch circuit of alternately opening and closing, and the insulating monitoring unit be connected with each described detector switch circuit;
Described insulating monitoring unit comprises:
Prediction module, for during replacing the curent change over the ground on the positive pole/negative pole circuit of the bus that switching station causes by described detector switch circuit, with three voltage sample values of the positive pole of bus described in very first time interval sampling/negative pole line-to-ground, and based on sampled three voltage-to-ground sampled values predict described positive pole/negative pole stable over the ground after magnitude of voltage;
Insulating monitoring module, magnitude of voltage correspondence after positive pole/negative pole of predicting based on described prediction module is stable over the ground determines the equivalent insulation against ground resistance value in described positive pole/negative pole supply line, and relatively comes correspondingly to determine whether positive pole/negative pole supply line has insulation against ground fault according to the equivalent insulation against ground resistance value in determined positive pole/negative pole supply line and predetermined threshold value.
9. the switching type type insulation monitoring system of DC power-supply system according to claim 8, is characterized in that, described prediction module also comprises:
Voltage sample submodule, for during curent change over the ground, to sample successively positive pole/negative pole three groups of voltage sample values over the ground of described bus based on the very first time interval of presetting, wherein, often organize in voltage sample value and comprise with the sampling of second time interval and the equal multiple voltage sample values of quantity;
Predicted voltage calculating sub module, for from often organizing in voltage sample value three the voltage sample values chosen respectively and be spaced apart described very first time interval, and according to a magnitude of voltage after over the ground stable of positive pole/negative pole described in selected three voltage sample value predictions, repeat described predicted voltage calculating sub module, to dope the multiple magnitudes of voltage after stablizing over the ground;
Predicted voltage filters mould module, for predicted each magnitude of voltage is carried out filtration treatment, with obtain described positive pole/negative pole stable over the ground after magnitude of voltage.
10. the switching type type insulation monitoring system of DC power-supply system according to claim 8 or claim 9, it is characterized in that, described prediction module is used for utilizing formula
predict described positive pole/negative pole stable over the ground after magnitude of voltage, wherein, Ue is the final voltage-to-ground value of prediction, U'
1, U'
2, U'
3be followed successively by three voltage-to-ground sampled values with described very first time interval sampling.
The switching type type insulation monitoring system of 11. DC power-supply system according to claim 9, it is characterized in that, described predicted voltage filters mould module for rejecting magnitude of voltage obviously abnormal in obtained multiple magnitudes of voltage, be averaged remaining multiple magnitude of voltage calculating again, with obtain predicting stable over the ground after magnitude of voltage.
The switching type type insulation monitoring system of 12. DC power-supply system according to claim 8, it is characterized in that, described type insulation monitoring system also comprises: the judge module between described prediction module and insulating monitoring module, for determining corresponding line-to-ground whether short circuit or open circuit according to predicted positive pole and negative pole voltage-to-ground value.
The switching type type insulation monitoring system of 13. DC power-supply system according to claim 12, it is characterized in that, if one is shorted to earth in described judge module determination positive pole and negative pole circuit, equivalent insulation against ground resistance value in the voltage-to-ground determination respective lines of described insulating monitoring module also on the circuit based on predicted not short circuit over the ground, again according to calculated equivalent insulation against ground resistance value and described threshold value compare determine described in the circuit of not short circuit whether have insulation against ground fault, and determine that the circuit of shorted to earth is insulation against ground fault.
The switching type type insulation monitoring system of 14. DC power-supply system according to claim 12, it is characterized in that, if at least one is for open a way over the ground in described judge module determination positive pole and negative pole circuit, described insulating monitoring module also for based on the equivalent insulation against ground resistance value in the voltage-to-ground determination respective lines on the predicted circuit of not opening a way over the ground, then according to calculated equivalent insulation against ground resistance value and described threshold value compare determine described in the circuit of not opening a way whether have insulation against ground fault.
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