CN107091969A - A kind of looped network of DC power intelligent detection device and method - Google Patents
A kind of looped network of DC power intelligent detection device and method Download PDFInfo
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- CN107091969A CN107091969A CN201710340268.3A CN201710340268A CN107091969A CN 107091969 A CN107091969 A CN 107091969A CN 201710340268 A CN201710340268 A CN 201710340268A CN 107091969 A CN107091969 A CN 107091969A
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G—PHYSICS
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Abstract
The present invention has designed and developed a kind of looped network of DC power intelligent detection device and method, looped network of DC power intelligent detection device includes DC bus-bar voltage measuring instrument, detect the current instrument of straight-flow system charger and batteries output load, decision-making treatment unit with human-computer interaction function, the responsive load module of two sections of dc bus of controlling switch break-make, and the D.C. isolation system module with ground connection control function.By monitoring two sections of DC bus-bar voltages, changed to form preliminary looped network type anticipation according to DC bus-bar voltage, start corresponding decision making algorithm, transformation DC earthing is detected as looped network of DC power detection function, for different looped network Type Control responsive load modules and D.C. isolation system module, while judging looped network of DC power according to measurement current conditions effective detection and forming alarm feedback.
Description
Technical field
The present invention relates to transformer station's supplying DC systems technology field, intelligently examined more particularly, to a kind of looped network of DC power
Survey apparatus and method.
Background technology
Straight-flow system is the important electric power system of transformer station, main to be responsible for relay protection device in station, automation equipment, break
Road device divide-shut brake loop, the power supply supply in monitoring signal loop, are related to observing and controlling running and the major network of transformer station secondary system
Can protection normally be outputed in the case of equipment fault.Low pressure 380V AC power supply systems in station are different from, straight-flow system the two poles of the earth are female
Line is isolated neutral system, therefore easily there is straight-flow system insulation deficiency, electricity because of loop ground connection, parasitic loop, electric looped network
The problems such as pressing out of control, will cause the serious consequences such as false alarm, false tripping breaker during multipoint earthing.
According to power industry standard DL/T 5044-2014 requirements, the straight-flow system of two group storage battery groups is configured in transformer station
It should use and set network interconnecting circuit between two sections of single female modes of connection, two sections of buses, and two sections of buses should be distinguished solely during normal operation
Vertical operation.Therefore two groups of dc sources should not have looped network connection under normal circumstances, but transformer station lives through mostly at present
Batteries list changes double, charger replacing, the technological transformation repairs such as interior new outgoing line interval reorganization and expansion of standing, and straight-flow system is easily left
Homopolarity looped network or the single-ended looped network situation of heteropole, because the output voltage of two groups of DC bus-bar voltage control is substantially close to anode ring
Net, negative pole looped network and both positive and negative polarity looped network situation are difficult to by the artificial discovery of monitoring, particularly both positive and negative polarity heterodoxy looped network and actual rings
Net resistance sizes are closely related, if looped network resistance tends to higher value, and two groups of buses of looped network also lack efficient apparatus and examined in time
Alarm is surveyed, looped network of DC power detection field is present makes up greatly space very much.
The content of the invention
Looped network of DC power detection method mainly has voltage-regulation method, ground connection determining method and signal injection method at this stage.
Voltage-regulation method is adjusts a set of DC charging motor output voltage under secure conditions, if another set of direct current system
System voltage correspondingly follows rise, then can determine whether that two sets of straight-flow systems have looped network situation, and then analyse in depth buses pair at different levels
Ground voltage situation of change is positive pole looped network or negative pole looped network to refine analysis.This method looped network judges more directly perceived, then also
It is the charger voltage for needing largely to adjust straight-flow system one of which bus, direct current positive pressure need to be avoided by improving magnitude of voltage
Normal domain of walker and measurement error, inevitably affect this group of bus institute on-load, are unfavorable for rated voltage and require high
Protection equipment bear qualified voltage.In addition, this method is only applicable to the consideration of homopolarity looped network, the detection of heteropole looped network, inspection are not applied to
Brake is limited.
It is that artificial one group of pole of bus one of setting is grounded under straight-flow system security situation to be grounded determining method, then reorganizes bus
Above earth potential will accordingly change, and another group of bus above earth potential situation is now judged again, whether bus above earth potential is contrasted with this
Unanimously, if change will equally can determine whether that two groups of dc bus have looped network situation.This method judges also be used in straight-flow system
When ground connection alarm occurring in abnormal cases, judge that two sets of straight-flow systems, whether always while there is earth fault, have, illustrated
Ring network fault.This method is the auxiliary judgment to looped network in the case of DC earthing, there are problems that three below using this method：
1. extra set the balance that earth point has actually had influence on the intrinsic insulation detection device of straight-flow system to dc bus
Electric bridge, therefore the alarm of straight-flow system Insulation monitoring will be inevitably triggered, occur true ground fault condition in straight-flow system
, there is risk hidden danger in the lower correct judgement that will interfere with transformer station's operation maintenance personnel；
2. after direct current thinks setting earth point, if the control loop of a certain breaker interval of straight-flow system load end occurs
During one point earth, now multipoint earthing situation will occur for straight-flow system, be easy to turn on control loop and send circuit breaker trip life
Order, causes major network switchgear false tripping, the serious consequence such as the whole network decompression power-off；
3. for heteropole looped network situations such as two sections of busbar grounding reverse polarity connections, ground connection determining method has originally been deposited straight-flow system is aggravated
Looped network problem, increase loop Leakage Current, and by looped network complication, be unfavorable for it is directly perceived, effectively judge heteropole
Looped network situation.
Low-frequency ac signal is is injected the two poles of the earth dc bus by signal injection method, then one by one with special on feeder line branch road
Detection clamp ammeter detection signal, when find two sections of buses on there is low frequency signal when then can determine that there is looped network of DC power,
And then continue to detect judgement in subordinate's branch road.This method is adapted to complicated loop structure and searched, but detection method relies on detection
The sensitivity of instrument, and the transmission contact between straight-flow system and load is basic using the big cable carriage of distribution capacity over the ground, note
The low-frequency ac signal entered is easily interfered decay, therefore the detection frequent misinterpretation of split-core type meter, and signal injection method is also to straight in addition
Streaming system produces unnecessary ripple influence, it is possible to cause signal malfunction, practical application effect is poor.
Looped network of DC power detection prior art respectively has advantage and disadvantage in summary, but larger interference shadow is produced to straight-flow system
Ring, or function is not comprehensive enough, be unfavorable for the safe and stable operation of straight-flow system, detection method is left to be desired raising.
In addition, straight-flow system uses D.C. isolation detecting system mostly at present, but D.C. isolation detecting system is for straight
Grounding is flowed, looped network detection technique is had no.Above-mentioned looped network detection method all considers looped network of DC power detection technique without fine simultaneously
Influence to D.C. isolation detecting system, engineering is actually inconsiderate.
To overcome at least one defect described in above-mentioned prior art, the technical solution adopted by the present invention is：
A kind of looped network of DC power intelligent detection device, including：
DC bus-bar voltage measuring instrument, the DC bus-bar voltage measuring instrument is connected with the decision-making treatment unit, in real time
Monitor two sections of dc bus positive and negative electrodes of straight-flow system pressure difference, and measurement feedback is transmitted to the decision-making treatment list over the ground
Member；
Charhing unit current instruments, the charhing unit current instruments are connected with the decision-making treatment unit, in real time
The output current of the charger being connected with two sections of dc bus of straight-flow system and battery is monitored, and measurement feedback is transmitted
To the decision-making treatment unit；
Decision-making treatment unit, the decision-making treatment unit controls mould for the algorithm computing of looped network of DC power intelligent detection device with maincenter
Block, starts decision making algorithm, and control the responsive load module and the D.C. isolation system mould according to each instrument detection case
Block performs looped network of DC power Intelligent Measurement process, and looped network of DC power test result, output response and announcement are drawn with reference to meter measurements
Alert signal reminds user to grasp testing result to human-computer interaction interface；
Responsive load module, the responsive load module is connected with the decision-making treatment unit, is looped network of DC power Intelligent Measurement work(
The performing module of energy；The responsive load module controls the responsive load module according to decision-making treatment unit output order
The size cut-off or change responsive load module load, and action is completed into signal and the measuring instrument for direct current
Table result feeds back to the decision-making treatment unit；
D.C. isolation system module, the D.C. isolation system module is connected with the decision-making treatment unit, is looped network of DC power intelligence
The performing module of function can be detected；The D.C. isolation system module possesses the earthing detection of straight-flow system bus insulation detector
Function, dc bus Grounding is detected with reference to DC bus-bar voltage monitoring in real time, when carrying out looped network of DC power detection, changes straight
The above earth potential situation of two sections of buses of streaming system, and feedback action completes signal to the decision-making treatment unit.
Preferably, the charhing unit current instruments include：The current detecting instrument of charger, the output of batteries
Current detecting instrument.
Preferably, described two sections of dc bus of responsive load module loading UNICOM；The responsive load module includes：It is controllable
Make the dc circuit breaker cut-off, measuring instrument for direct current table, the resistive load of controllable change resistance, the controllable direct current cut-off
Breaker, measuring instrument for direct current table, the resistive load three series connection of controllable change resistance；The responsive load module passes through
The control controllable dc circuit breaker division cut-off or the resistance for changing the controllable resistive load for changing resistance
Size realizes the size cut-off or change responsive load module load of the responsive load module.
Preferably, the D.C. isolation system module has two groups of control circuits, and every group of control circuit includes balanced bridge, connect
Ground unit, wherein ground unit have the dc circuit breaker of controllable disjunction, and the control circuit is each connected in parallel on two sections of direct currents
Bus；
The D.C. isolation system module realizes the earthing detection of straight-flow system bus insulation detector by the balanced bridge
Function；
The D.C. isolation system module is by controlling the dc circuit breaker of the ground unit to change two sections of straight-flow system
The above earth potential situation of bus.
A kind of detection method of utilization looped network of DC power intelligent detection device, the detection method passes through the looped network of DC power intelligence
Energy detection means monitors two sections of bus above earth potential situations of straight-flow system in real time,
The detection method comprises the following steps：
S1：Start；
S2：The above earth potential of two sections of dc bus is detected, step S3 is transferred to；
S3：Above earth potential in step S2 judges that straight-flow system whether there is earth fault, is transferred to if there is earth fault
Step S9, if being transferred to step S4 in the absence of earth fault；
S4：Whether detection bus current potential meets anticipation situation, is transferred to step S5；
S5：Start looped network anticipation program, be transferred to step S6；
S6：Start corresponding Secondary Judgment detection, be transferred to step S7；
S7：Looped network is judged whether, step S8 is transferred to if it there is looped network, the return to step S2 if in the absence of looped network；
S8：Looped network alarm is sent, step S11 is transferred to；
S9：DC system grounding alarm is sent, step S10 is transferred to；
S10：Locking looped network of DC power detects function, is transferred to step S11；
S11：Detect whether locking looped network detection means, step S12 is transferred to if looped network detection means if locking, if without locking
Looped network detection means is then transferred to return to step S2.
S12：Terminate.
Preferably, the looped network anticipation program comprises the following steps：
Step one：Measure the positive pole above earth potential of dc bus 1 and the positive pole above earth potential of dc bus 2；
Step 2：Measure the negative pole above earth potential of dc bus 1 and the negative pole above earth potential of dc bus 2；
Step 3：Draw looped network anticipation conclusion.
The present invention has designed and developed a kind of looped network of DC power intelligent detection device and method, looped network of DC power intelligent detection device bag
The current instrument of measuring instrument containing DC bus-bar voltage, detection straight-flow system charger and batteries output load, with people
The decision-making treatment unit of machine interactive function, the responsive load module of two sections of dc bus of controlling switch break-make, and with ground connection
The D.C. isolation system module of control function.By monitoring two sections of DC bus-bar voltages, changed to be formed according to DC bus-bar voltage
Preliminary looped network type anticipation, starts corresponding decision making algorithm, and transformation DC earthing is detected as looped network of DC power detection function, for
Different looped network Type Control responsive load modules and D.C. isolation system module, while according to measurement current conditions effective detection
Judge looped network of DC power and form alarm feedback.
Brief description of the drawings
Fig. 1 is looped network of DC power intelligent detection device operating diagram.
Fig. 2 is looped network of DC power Intelligent Measurement process schematic of the present invention.
Description of reference numerals：
1-DC bus-bar voltage measuring instrument, 2-interconnection switch K12,3-decision-making treatment unit, 4-responsive load module,
41-controllable the dc circuit breaker cut-off, 42-measuring instrument for direct current table, the resistive load of 43-controllable change resistance,
5-responsive load module, the 51-controllable dc circuit breaker cut-off, 52-measuring instrument for direct current table, 53-controllable become
Change the resistive load of resistance, 7-D.C. isolation system module, 71-earthing breaker K1,72-balance resistance R11,73-flat
Weigh resistance R12,8-D.C. isolation system module, 81-earthing breaker K2,72-balance resistance R21,73-balance resistance
R22,9-#1 charger, 10-#1 batteries, 11-#2 chargers, 12-#2 batteries.
Embodiment
Accompanying drawing being given for example only property explanation, it is impossible to be interpreted as the limitation to this patent；It is attached in order to more preferably illustrate the present embodiment
Scheme some parts to have omission, zoom in or out, do not represent the size of actual product；To those skilled in the art,
Some known features and its explanation may be omitted and will be understood by accompanying drawing.Being given for example only property of position relationship described in accompanying drawing
Explanation, it is impossible to be interpreted as the limitation to this patent.
As shown in figure 1, a kind of looped network of DC power intelligent detection device, including：DC bus-bar voltage measuring instrument 1, charging are single
Elementary current measuring instrumentss, decision-making treatment unit 3, responsive load module 4, D.C. isolation system module 7.
Wherein, DC bus-bar voltage measuring instrument 1 is connected with decision-making treatment unit 3, and two sections of monitoring straight-flow system is straight in real time
Flow bus positive and negative electrode pressure difference, and measurement feedback is transmitted to decision-making treatment unit 3 over the ground.
Charhing unit current instruments include：Dc bus 1（KM1）Current detecting instrument 21, the direct current of upper charger are female
Line 2（KM2）Current detecting instrument 21, the dc bus 1 of upper charger（KM1）The output electric current measure instrument 22 of upper batteries and straight
Flow bus 2（KM2）The output electric current measure instrument 22 of upper batteries, charhing unit current instruments and decision-making treatment unit 3
It is connected, the output current of the charger 9,11 being connected with two sections of dc bus of straight-flow system and battery 10,12 is monitored in real time, and
Measurement feedback is transmitted to decision-making treatment unit 3.
Algorithm computing and maincenter control module of the decision-making treatment unit 3 for looped network of DC power intelligent detection device, according to each instrument
Table detection case starts decision making algorithm, and control response load blocks and D.C. isolation system module perform looped network of DC power and intelligently examined
Survey process, draws looped network of DC power test result, output is responded and alarm signal is to human-computer interaction interface with reference to meter measurements,
User is reminded to grasp testing result；
Responsive load module 4,5 is connected with decision-making treatment unit 3, is the performing module of looped network of DC power intelligent detecting function, is straight
Flow the performing module of looped network intelligent detecting function；Each responsive load module includes：The controllable dc circuit breaker 41 cut-off,
51st, the resistive load 43,53 of measuring instrument for direct current table 42,52 and controllable change resistance, the controllable direct current interruption cut-off
Resistive load 43, the 53 threes series connection of device 41,51, measuring instrument for direct current table 42,52 and controllable change resistance, two responses
Load blocks load two sections of dc bus of UNICOM respectively, and responsive load module exports order control according to decision-making treatment unit 3 can
Control the dc circuit breaker 41 cut-off, 51 divisions or change the resistance size of the resistive load 43,53 of controllable change resistance,
And action completion signal and measuring instrument for direct current table 42,52 results are fed back into decision-making treatment unit 3.
D.C. isolation system module 7,8 is connected with decision-making treatment unit 3, is all the execution of looped network of DC power intelligent detecting function
Module；D.C. isolation system module 7,8 has two groups of control circuits, and every group of control circuit includes balanced bridge, ground unit, ground connection
Unit has the dc circuit breaker 71,81 of controllable disjunction, and control circuit is each connected in parallel on two sections of dc bus；D.C. isolation system
System module 7,8 possesses the earthing detection function of general straight-flow system bus insulation detector by balanced bridge, female with reference to direct current
Line voltage monitoring can detect dc bus Grounding in real time, and when carrying out looped network of DC power detection, the direct current of control ground unit breaks
Road device 71,81, changes the above earth potential situation of two sections of buses of straight-flow system with this, and feedback action completes signal to decision-making treatment
Unit 3.
As shown in Fig. 2 a kind of detection method of utilization looped network of DC power intelligent detection device, the detection method passes through described
Looped network of DC power intelligent detection device monitors two sections of bus above earth potential situations of straight-flow system in real time,
The detection method comprises the following steps：
S1：Start；
S2：The above earth potential of two sections of dc bus is detected, step S3 is transferred to；
S3：Above earth potential in step S2 judges that straight-flow system whether there is earth fault, is transferred to if there is earth fault
Step S9, if being transferred to step S4 in the absence of earth fault；
S4：Whether detection bus current potential meets anticipation situation, is transferred to step S5；
S5：Start looped network anticipation program, be transferred to step S6；
S6：Start corresponding Secondary Judgment detection, be transferred to step S7；
S7：Looped network is judged whether, step S8 is transferred to if it there is looped network, the return to step S2 if in the absence of looped network；
S8：Looped network alarm is sent, step S11 is transferred to；
S9：DC system grounding alarm is sent, step S10 is transferred to；
S10：Locking looped network of DC power detects function, is transferred to step S11；
S11：Detect whether locking looped network detection means, step S12 is transferred to if looped network detection means if locking, if without locking
Looped network detection means is then transferred to return to step S2.
S12：Terminate.
Specifically, with reference to Fig. 1,2, the looped network of DC power intelligent detection device monitors straight-flow system two in real time under normal circumstances
Section bus above earth potential situation, when finding that dc bus current potential meets looped network anticipation situation, starts the decision-making treatment unit
Looped network of DC power detection algorithm, the looped network of DC power detection algorithm is divided into looped network anticipation program and Secondary Judgment stage, wherein institute
State responsive load module described in Secondary Judgment stage control and D.C. isolation system module action, the letter produced with reference to action
Number feedback draws Secondary Judgment conclusion, and final looped network testing result is drawn with reference to anticipation conclusion.
The looped network anticipation program includes：
Step one：Measure the positive pole above earth potential of dc bus 1 and the positive pole above earth potential of dc bus 2；
Step 2：Measure the negative pole above earth potential of dc bus 1 and the negative pole above earth potential of dc bus 2；
Step 3：Draw looped network anticipation conclusion.
Looped network anticipation conclusion one：When the positive pole above earth potential of dc bus 1 with the positive pole above earth potential of dc bus 2 is simultaneously
Just, and potential value difference is less than specified current potential 0.5%, the negative pole above earth potential of dc bus 1 and the negative pole above earth potential of dc bus 2
When simultaneously to bear, anticipation straight-flow system there may be positive pole looped network, obtain the single-ended looped network anticipation conclusion of positive pole.
Looped network anticipation conclusion two：When the negative pole above earth potential of dc bus 1 with the negative pole above earth potential of dc bus 2 is simultaneously
Bear, and potential value is differed when being less than specified current potential 0.5%, the positive pole above earth potential of dc bus 1 and the positive pole of dc bus 2 are electric over the ground
Position is simultaneously timing, and anticipation straight-flow system there may be negative pole looped network, obtain the single-ended looped network anticipation conclusion of negative pole.
Looped network anticipation conclusion three：When the positive pole above earth potential of dc bus 1 with the positive pole above earth potential of dc bus 2 is simultaneously
Just, and potential value difference is less than specified current potential 0.5%, the negative pole above earth potential of dc bus 1 and the negative pole above earth potential of dc bus 2
It is negative simultaneously, and potential value difference is less than specified current potential 0.5%, looped network when anticipation straight-flow system there may be positive and negative electrodes in same is obtained
Both positive and negative polarity both-end looped network anticipation conclusion.
Looped network anticipation conclusion four：When the positive pole above earth potential of dc bus 1 with the positive pole above earth potential of dc bus 2 is simultaneously
Just, and potential value differs by more than specified current potential 2%, the negative pole above earth potential of dc bus 1 and the negative pole above earth potential of dc bus 2 are same
When be negative, and potential value differs by more than specified current potential 2%.
Step 4：If draw looped network anticipation conclusion for looped network anticipation conclusion four, straight-flow system bus electricity is determined whether
Pressure situation, draws second of looped network anticipation conclusion.
Second of looped network anticipation conclusion one：When the positive pole above earth potential of dc bus 1 is electric over the ground less than the positive pole of dc bus 2
Position, when the negative pole above earth potential absolute value of dc bus 1 is more than 2 negative pole above earth potential absolute value of dc bus, anticipation direct current system
System there may be the positive pole of dc bus 1 and there is electric looped network with the negative pole of dc bus 2, obtain the positive pole of dc bus 1 female with direct current
The single-ended looped network anticipation conclusion of the negative pole heteropole of line 2.
Second of looped network anticipation conclusion two：When the positive pole above earth potential of dc bus 1 is electric over the ground more than the positive pole of dc bus 2
Position, when the negative pole above earth potential absolute value of dc bus 1 is less than 2 negative pole above earth potential absolute value of dc bus, anticipation direct current system
System there may be the negative pole of dc bus 1 and there is electric looped network with the positive pole of dc bus 2, obtain the negative pole of dc bus 1 female with direct current
The single-ended looped network anticipation conclusion of the positive pole heteropole of line 2.
Second of looped network anticipation conclusion three：When the positive pole above earth potential of dc bus 1 and the positive pole above earth potential of dc bus 2 are same
When differed with zero potential less than specified current potential 5%, the negative pole above earth potential of dc bus 1 with the negative pole above earth potential of dc bus 2 simultaneously
Differed with zero potential less than specified current potential 5%, anticipation straight-flow system there may be the negative pole of dc bus 1 and be deposited with the positive pole of dc bus 2
In electric looped network, there is electric looped network with the negative pole of dc bus 2, obtain two sections of dc bus heteropole both-ends in the positive pole of dc bus 1
Looped network anticipation conclusion.
Obtain after looped network anticipation conclusion, starting performing module according to anticipation conclusion carries out Secondary Judgment detection, wherein described
Secondary Judgment detection method is directed to the looped network anticipation conclusion one to three of homopolarity looped network, starts action policy twice.
Action policy 1：Determine that respectively switch and controller recover normal shape to straight-flow system with looped network of DC power intelligent detection device
State, control disconnects the earthing breaker K2 82 in D.C. isolation system module 8, then will be controllable in responsive load module 5
The resistive load 53 of change resistance is adjusted to maximum, and control is closed the dc circuit breaker 51 in responsive load module 5, now controlled
The resistive load 53 of controllable change resistance progressively adjusts resistance value reduction, while judging the direct current in responsive load module 5
[P1] and charhing unit current instruments of current instruments 52 detect electricity in dc bus 1 and dc bus 2
The change of stream.
Action policy 2：Determine that respectively switch and controller recover normal shape to straight-flow system with looped network of DC power intelligent detection device
State, control disconnects the earthing breaker K2 71 in D.C. isolation system module 7, then will be controllable in responsive load module 4
The resistive load 43 of change resistance is adjusted to maximum, and control is closed the dc circuit breaker 41 in responsive load module 4, now controlled
The resistive load 43 of controllable change resistance progressively adjusts resistance value reduction, while judging the direct current in responsive load module 4
[P2] and charhing unit current instruments of current instruments 42 detect electricity in dc bus 1 and dc bus 2
The change of stream.
Wherein, non-looped network detection judges：If the above earth potential of dc bus 2 is raised during action policy 1, dc bus 1
Charhing unit output current（Dc bus 1（KM1）The measurement electric current of current detecting instrument 21 and the dc bus 1 of upper charger（KM1）
The output electric current measure instrument 22 of upper batteries measures the vector of electric current, below statement " the charhing unit of dc bus 1 output electricity
With definition during stream "）With the charhing unit output current (dc bus 2 of dc bus 2（KM2）The current detecting instrument 21 of upper charger
Measure electric current and dc bus 2（KM2）The output electric current measure instrument 22 of upper batteries measures the vector of electric current, states below
When " the charhing unit output current of dc bus 2 " with definition) with it is controllable change resistance resistive load 53 change without
Increase, the measurement electric current 1 of responsive load module 5 is zero, and the above earth potential of dc bus 1 is raised during action policy 2, and direct current is female
The charhing unit output current of line 1 and the charhing unit output current of dc bus 2 are with the resistive load 43 of controllable change resistance
Change when the measurement electric current 2 of responsive load module 4 is zero, then can determine whether that straight-flow system does not have looped network, return without increasing
Judge not corresponding informance, and close the dc circuit breaker 41 in the D.C. isolation system module immediately.
The detection of positive pole homopolarity looped network judges：If the above earth potential of dc bus 2 is differed with rated value during action policy 1
5%, the charhing unit output current of dc bus 1 does not increase, and the measurement electric current 1 of responsive load module 5 has increased, dc bus 2
Charhing unit output current has increased, and the measurement electric current 1 of responsive load module 5 is equal to the charhing unit output current of dc bus 2
Increment, and the above earth potential of dc bus 1 differs 5%, the charhing unit of dc bus 2 output electricity with rated value during action policy 2
Stream does not increase, and the measurement electric current 2 of responsive load module 4 has increased, and the charhing unit output current of dc bus 1 has increased,
When the measurement electric current 2 of responsive load module 4 is equal to the increment of the charhing unit output current of dc bus 1, then straight-flow system is can determine whether
There is positive pole homopolarity looped network, draw positive pole homopolarity looped network Secondary Judgment conclusion.
The detection of negative pole homopolarity looped network judges：If the above earth potential of dc bus 2 is differed with rated value during action policy 1
5%, the charhing unit output current of dc bus 1 has increased, and the measurement electric current 1 of responsive load module 5 has increased, dc bus 2
Charhing unit output current does not increase, and the measurement electric current 1 of responsive load module 5 is equal to the charhing unit output current of dc bus 1
Increment, the above earth potential of dc bus 1 differs 5%, the charhing unit of dc bus 2 output electricity with rated value during action policy 2
Stream has increased, and the measurement electric current 2 of responsive load module 4 has increased, and the charhing unit output current of dc bus 1 does not increase,
When the increment of the charhing unit output current of dc bus 2 is equal to the measurement electric current 2 of responsive load module 4, then straight-flow system is can determine whether
There is negative pole homopolarity looped network, draw negative pole homopolarity looped network Secondary Judgment conclusion.
Positive pole is detected with negative pole both-end homopolarity looped network to be judged：If responsive load module 5 measures electric current during action policy 1
1 has increased, if the measurement of responsive load module 4 electric current 2 has increased during action policy 2, and meets following feedback
One of：
（1）The measurement electric current 1 of responsive load module 5 is equal to the increasing of the charhing unit output current of dc bus 1 in action policy 1
The measurement electric current 2 of responsive load module 4 is equal to the charhing unit output current increment of dc bus 2 in amount, action policy 2；
（2）The measurement electric current 1 of responsive load module 5 is equal to the charhing unit output current increment of dc bus 1 in action policy 1,
The measurement electric current 2 of responsive load module 4 is equal to the charhing unit output current increment of dc bus 1 in action policy 2；
（3）The measurement electric current 1 of responsive load module 5 is equal to the charhing unit output current increment of dc bus 2 in action policy 1,
The measurement electric current 2 of responsive load module 4 is equal to the charhing unit output current increment of dc bus 2 in action policy 2；
（4）The measurement electric current 1 of responsive load module 5 is equal to the increment of the charhing unit output current of dc bus 1 in action policy 1
With the increment of 2 charhing unit output currents, the measurement electric current 2 of responsive load module 4 fills equal to dc bus 1 in action policy 2
The increment of the increment of electric unit output current and 2 charhing unit output currents；
It then can determine whether that straight-flow system has positive pole and negative pole both-end homopolarity looped network, show that positive pole and negative pole both-end homopolarity looped network are secondary
Judge conclusion.
Positive pole judges with negative pole single-ended heteropole looped network detection：For second of looped network anticipation conclusion one of heteropole looped network（For
The positive pole of dc bus 1 and the single-ended looped network anticipation conclusion of the negative pole heteropole of dc bus 2）, by the controllable change in responsive load module
The resistive load 53 for changing resistance is adjusted to maximum, and the dc circuit breaker 51 in responsive load module is closed in control, and now control can
The resistive load 53 of control change resistance progressively adjusts resistance value reduction, and when being reduced to certain value, detection meets with a response negative
Carry module measurement electric current to have increased, the positive pole above earth potential of dc bus 1 reduction, while the negative pole above earth potential liter of dc bus 2
Gao Shi, can obtain the positive pole of dc bus 1 and the single-ended heteropole looped network Secondary Judgment conclusion of the negative pole of dc bus 2, other voltage changes
Situation, which is returned, judges not corresponding informance.
For second of looped network anticipation conclusion two（It is that the negative pole of dc bus 1 and the single-ended looped network of positive pole heteropole of dc bus 2 are pre-
Sentence conclusion）, the resistive load 43 of the controllable change resistance in responsive load module is adjusted to maximum, it is negative that response is closed in control
The dc circuit breaker 41 in module is carried, now controls the resistive load 43 of controllable change resistance that resistance value is progressively adjusted to drop
It is low, when being reduced to certain value, detect that the load blocks measurement electric current that meets with a response has increased, the positive pole of dc bus 2 is electric over the ground
Potential drop is low, while during the rise of the negative pole above earth potential of dc bus 1, can obtain the negative pole of dc bus 1 and the positive pole heteropole of dc bus 2
Single-ended looped network Secondary Judgment conclusion.
Positive pole is detected with negative pole both-end heteropole looped network to be judged：For the third anticipation situation of heteropole looped network（It is straight for two sections
Flow bus heteropole both-end looped network anticipation conclusion）, now the DC charging unit of two sections of dc bus is short-circuit equivalent to series connection, and by
Charging owner exerts oneself, and charging current is very big, will typically start the intrinsic power-off protection of charger and fuse blows to cut off
Loop, if detection charger electric current is more than 1.5 times of setting values（Less than two sections bus overcurrent protection values of setting value, higher than 1.1 times two
Section bus load current value）3s is continued above, heteropole both-end looped network Secondary Judgment conclusion is drawn, and send critical alarm immediately.
Looped network of DC power Intelligent Measurement principle explanation.
For the single-ended homopolarity looped network of positive pole, positive bus voltage is consistent substantially, and now the charger of two sections of buses is defeated
If going out voltage difference has difference, all difference can obtain the anticipation conclusion of the single-ended homopolarity looped network of positive pole by negative pole above earth potential.
Based on this by control response load blocks and D.C. isolation system module, reaction result is examined with further certification anticipation knot
By.Allow wherein one section dc bus first（Such as dc bus 2）Bus insulation against ground detection function is released, eliminating looped network with this leads to
Cross the Leakage Current interference of electric bridge earth-return circuit composition.Then the resistance of responsive load module is allowed（Such as controllable change resistance
Resistive load 53）After maximization, it is ensured that closing two sections of straight-flow systems after dc circuit breaker module has the electricity of maximum insulating property (properties)
Gas is got in touch with, and closes dc circuit breaker（Dc circuit breaker 51）Judge to lose electric bridge bus over the ground immediately afterwards（Such as dc bus 2）'s
Direct current both positive and negative polarity above earth potential, if bus positive pole above earth potential is raised, negative pole and another section of bus（Dc bus 1）Positive pole is over the ground
Current potential is identical, it is seen that responsive load module is unique electrical communication loop, and looped network problem is not present in straight-flow system；
If current potential is close with normal condition, that is, the bus positive pole above earth potential of electric bridge over the ground is lost with negative pole above earth potential with losing
Above earth potential is close before electric bridge, illustrates to have looped network, it is necessary to further flow back to draw loop by adjusting resistive load.When it
In a certain section of DC charging unit（Such as dc bus 1, predominantly charger is exerted oneself）Output current and homonymy responsive load module
Measurement electric current（As responsive load measures electric current 1）When increasing simultaneously, it is seen that loop current path is：The direct current of dc bus 1 fills
Motor positive pole-charger current instruments -1 positive electrode bus of dc bus-responsive load module 5（Successively surveyed through overcurrent
Measure instrument-dc circuit breaker-resistive load）2 negative electrode bus of-dc bus -1 negative electrode bus of dc bus-dc bus 1
DC charging motor negative pole.Action policy 1 is actually consistent with the Principle of Process of action policy 2, and two action process feedback results are simultaneously
Meet can effective detection draw there is the single-ended homopolarity looped network of negative pole.
When wherein a certain section DC charging unit（Such as dc bus 2, predominantly charger is exerted oneself）Output current and offside
The measurement electric current of responsive load（As responsive load measures electric current 1）When increasing simultaneously, it is seen that loop current path is：Dc bus
The 2 DC charging motor positive poles-charger current instruments-positive electrode bus of 2 positive electrode bus of dc bus-dc bus 1-sound
Answer load blocks 5（Successively pass through current instruments-dc circuit breaker-resistive load）The negative electrode bus of-dc bus 2-straight
Flow the DC charging motor negative pole of bus 2.Similarly judged simultaneously using two action policy processes, thus can effective detection draw positive pole
Single-ended homopolarity looped network.
When there is both positive and negative polarity both-end homopolarity looped network situation, responsive load module is flowed through under first latter two action policy control
Current in resistance property be possible to only homonymy dc bus charger electric current for stream, be also possible under two action policies be all
Certain side dc bus charger electric current is also possible to single responsive load module by both sides dc bus charger electric current for stream
For stream, another responsive load module is supplied to flow by side dc bus charger electric current, caused by homopolarity looped network resistance
Dc bus potential difference.By detecting that the change of charger output current just can be effective with responsive load module measurement curent change
Monitor positive pole and negative pole both-end homopolarity looped network situation.
For the single-ended heteropole looped network situation of both positive and negative polarity, the positive pole above earth potential and negative pole above earth potential of looped network will be with looped networks
Resistance is different and accordingly changes.Therefore in the case of this looped network（Assuming that the positive pole of dc bus 1 and the negative pole looped network of dc bus 2）,
Probabilistic looped network resistance will reduce the connected positive pole insulation against ground performance of bus 1 of looped network and the negative pole insulation against ground of bus 2
Energy.From the derivation of equation,,
In above formula,For the output voltage of straight-flow system charger 1（Both positive and negative polarity pressure difference）,For the defeated of straight-flow system charger 2
Go out voltage,For looped network resistance.
Therefore work asWhen infinitely great,,, the above earth potential of two sections of buses with
Rated value is identical, sets under normal circumstances、、、Four balance resistances are equal.Therefore by,。
WhenWhen resistance is by reducing greatly, it is known thatIt will reduce,Will increase（Absolute value reduces）, butWhen, obtain, i.e. the equivalent above earth potential in the two poles of the earth of looped network is zero.Therefore can be in uncertain resistanceA upper control in parallel
The resistive resistance of variable resistor processed, i.e. responsive load moduleOr, when closeWhen, two sections of bus above earth potentials will be influenceed
Situation, the single-ended heteropole looped network of both positive and negative polarity is judged according to potential change trend effective detection.
It is now mutual by looped network resistance equivalent to straight-flow system power-supply system for both positive and negative polarity both-end heteropole looped network situation
Series connection conducting, will cause great series current, will start the intrinsic overcurrent protection of straight-flow system charger under normal circumstances and moves
Make, or excessively stream causes fuse to blow, with this supply of cutting off the electricity supply.If looped network resistance is very big, it is not enough to cause above-mentioned protection
, can be by detecting charger excessively stream and duration, when less than two sections bus overcurrent protection values of overcurrent value, higher than 1.1 during action
Two sections of bus load current values, can immediately arrive at heteropole both-end looped network Secondary Judgment conclusion, and send critical alarm letter immediately again
Number feedback.
Obviously, the above embodiment of the present invention is only intended to clearly illustrate example of the present invention, and is not pair
The restriction of embodiments of the present invention.For those of ordinary skill in the field, may be used also on the basis of the above description
To make other changes in different forms.There is no necessity and possibility to exhaust all the enbodiments.It is all this
Any modifications, equivalent substitutions and improvements made within the spirit and principle of invention etc., should be included in the claims in the present invention
Protection domain within.
Claims (6)
1. a kind of looped network of DC power intelligent detection device, it is characterised in that including：
DC bus-bar voltage measuring instrument（1）, the DC bus-bar voltage measuring instrument（1）With the decision-making treatment unit（3）
Be connected, in real time monitoring straight-flow system two sections of dc bus positive and negative electrodes pressure difference over the ground, and by measurement feedback transmit to it is described certainly
Plan processing unit（3）；
Charhing unit current instruments, the charhing unit current instruments are connected with the decision-making treatment unit, in real time
Monitor the charger being connected with two sections of dc bus of straight-flow system（9、11）And battery（10、12）Output current, and will survey
Result feedback transmission is measured to the decision-making treatment unit（3）；
Decision-making treatment unit（3）, the decision-making treatment unit（3）Algorithm computing and maincenter for looped network of DC power intelligent detection device
Control module, starts decision making algorithm, and control the responsive load module according to each instrument detection case（4、5）With the direct current
Insulation system module（7、8）Looped network of DC power Intelligent Measurement process is performed, looped network of DC power detection knot is drawn with reference to meter measurements
By output response and alarm signal remind user to grasp testing result to human-computer interaction interface；
Responsive load module（4、5）, the responsive load module（4、5）With the decision-making treatment unit（3）It is connected, is direct current ring
The performing module of net intelligent detecting function；The responsive load module（4、5）According to the decision-making treatment unit（3）Output order
Control the responsive load module（4、5）Cut-off or change the responsive load module（4、5）The size of load, and will be dynamic
Make to complete signal and the measuring instrument for direct current table（43、53）As a result the decision-making treatment unit is fed back to（3）；
D.C. isolation system module（7、8）, the D.C. isolation system module（7、8）With the decision-making treatment unit（3）It is connected,
For the performing module of looped network of DC power intelligent detecting function；The D.C. isolation system module（7、8）Possesses straight-flow system bus exhausted
The earthing detection function of edge detector, dc bus Grounding is detected with reference to DC bus-bar voltage monitoring in real time, straight when carrying out
When flowing looped network detection, change the above earth potential situation of two sections of buses of straight-flow system, and feedback action completes signal to the decision-making
Processing unit（3）.
2. looped network of DC power intelligent detection device according to claim 1, it is characterised in that：The charhing unit current measurement
Instrument includes：The current detecting instrument of charger, the output electric current measure instrument of batteries.
3. looped network of DC power intelligent detection device according to claim 1, it is characterised in that：The responsive load module（4、
5）Load two sections of dc bus of UNICOM；The responsive load module（4、5）Including：The controllable dc circuit breaker cut-off（41、
51）, measuring instrument for direct current table（42、52）, controllable change resistance resistive load（43、53）, the controllable direct current cut-off
Breaker（41、51）, measuring instrument for direct current table（42、52）, controllable change resistance resistive load（43、53）Three goes here and there
Connection；
The responsive load module（4、5）By controlling the controllable dc circuit breaker cut-off（41、51）Division changes
Become the resistive load of the controllable change resistance（42、52）Resistance size realize the responsive load module（4、5）'s
Cut-off or change the responsive load module（4、5）The size of load.
4. the looped network of DC power intelligent detection device according to claim 1 or 3, it is characterised in that：The D.C. isolation system
Module（7、8）There are two groups of control circuits, every group of control circuit includes balanced bridge, ground unit, wherein have can for ground unit
Control the dc circuit breaker of disjunction（71、72）, it is described to control circuit to be each connected in parallel on two sections of dc bus；
The D.C. isolation system module（7、8）The ground connection of straight-flow system bus insulation detector is realized by the balanced bridge
Detect function；
The D.C. isolation system module（7、8）By the dc circuit breaker for controlling the ground unit（71、72）Change
The above earth potential situation of two sections of buses of straight-flow system.
5. a kind of detection method of looped network of DC power intelligent detection device using as described in one of Claims 1-4, the detection
Method monitors two sections of bus above earth potential situations of straight-flow system in real time by the looped network of DC power intelligent detection device,
The detection method comprises the following steps：
S1：Start；
S2：The above earth potential of two sections of dc bus is detected, step S3 is transferred to；
S3：Above earth potential in step S2 judges that straight-flow system whether there is earth fault, is transferred to if there is earth fault
Step S9, if being transferred to step S4 in the absence of earth fault；
S4：Whether detection bus current potential meets anticipation situation, is transferred to step S5；
S5：Start looped network anticipation program, be transferred to step S6；
S6：Start corresponding Secondary Judgment detection, be transferred to step S7；
S7：Looped network is judged whether, step S8 is transferred to if it there is looped network, the return to step S2 if in the absence of looped network；
S8：Looped network alarm is sent, step S11 is transferred to；
S9：DC system grounding alarm is sent, step S10 is transferred to；
S10：Locking looped network of DC power detects function, is transferred to step S11；
S11：Detect whether locking looped network detection means, step S12 is transferred to if looped network detection means if locking, if without locking
Looped network detection means is then transferred to return to step S2；
S12：Terminate.
6. detection method according to claim 5, it is characterised in that：The looped network anticipation program comprises the following steps：
Step one：Measure the positive pole above earth potential of dc bus 1 and the positive pole above earth potential of dc bus 2；
Step 2：Measure the negative pole above earth potential of dc bus 1 and the negative pole above earth potential of dc bus 2；
Step 3：Draw looped network anticipation conclusion.
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