CN110212497A - Based on the substation of fault location DC power supply active protective device and guard method - Google Patents
Based on the substation of fault location DC power supply active protective device and guard method Download PDFInfo
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- CN110212497A CN110212497A CN201910246266.7A CN201910246266A CN110212497A CN 110212497 A CN110212497 A CN 110212497A CN 201910246266 A CN201910246266 A CN 201910246266A CN 110212497 A CN110212497 A CN 110212497A
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
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Abstract
The invention discloses a kind of based on the substation of fault location DC power supply active protective device; DC bus and every direct current feed out and are equipped with protective device between branch; protective device includes single chip machine controlling circuit and the power electronics breaker and fault detection circuit that connect with single chip machine controlling circuit; the output end of DC bus is connect with the input terminal of power electronics breaker; the output end of power electronics breaker feeds out branch connection with corresponding direct current, and single chip machine controlling circuit control signal output is connect with power electronics breaker control signal input part；Fault detection circuit includes voltage and current sample circuit and ground fault detection circuit.DC power supply active protective device of the present invention can either find the ground connection of direct current system and short trouble in substation in time; it can be accurately positioned out again and correspond to out of order direct current branch; it can also be adjusted out in time according to failure and be output to the voltage for feeding out branch, to improve the continuity of transforming plant DC power-supply system work, reliability and security.
Description
Technical field
The present invention relates to a kind of based on the substation of fault location DC power supply active protective device, further relates to above-mentioned
The guard method of DC power supply active protective device, belongs to technical field of electric power automation.
Background technique
For transformer station direct current system, due to various reasons, stand in direct current system be grounded frequent occurrence with short circuit etc.
The single-point grounding long-play of failure, interior direct current system of standing does not allow, and such as handles not in time, when another pole connects again
Earth fault will result in direct current system short circuit, cause direct current power loss.
There are many shortcomings for the solution and fault location technology of existing DC system earth fault: due to looking into
The poor anti jamming capability for looking for instrument will cause the wrong report of ground fault, and any conducting wire on access DC bus will be searched,
Project amount is big, cannot achieve the quick accurate positioning of ground fault；In addition, present direct current system relies on breaker substantially, melts
The passive tripping of core and fuse protection cannot achieve actively monitoring and actively protection to DC Line Fault.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of based on the DC power supply active of the substation of fault location
Formula protective device, the DC power supply active protective device can either find the ground connection of direct current system and short circuit in substation in time
Failure, and can be accurately positioned out and correspond to out of order direct current branch, additionally it is possible to adjust out to be output in time according to failure and feed out
The voltage of branch, to improve the continuity of transforming plant DC power-supply system work, reliability and security.
In order to solve the above technical problems, the technical scheme adopted by the invention is as follows:
Based on the substation of fault location DC power supply active protective device, DC bus (DC power supply) with every
Direct current, which is fed out, is equipped with the protective device (each direct current feeds out parallel with one another between branch), the protective device packet between branch
The power electronics breaker and fault detection circuit for including single chip machine controlling circuit and connecting with single chip machine controlling circuit, direct current are female
The output end of line is connect with the input terminal of power electronics breaker, and the output end of power electronics breaker is fed out with corresponding direct current
Branch connection, single chip machine controlling circuit control signal output are connect with power electronics breaker control signal input part；Failure
Detection circuit includes voltage and current sample circuit and ground fault detection circuit.
Wherein, the protective device further includes failure alarm circuit, and failure alarm circuit is connect with single chip machine controlling circuit.
Wherein, power electronics breaker include voltage input end Uin, voltage output end Uo, metal-oxide-semiconductor Q1~Q4, high frequency every
From transformer T, resonant inductance Lr, outputting inductance L1 and rectifier diode D1~D4, four of PWM1~PWM4 of single-chip microcontroller
Signal driving end and four metal-oxide-semiconductor Q1~Q4 of power electronics breaker are connected respectively, four signals of PWM1~PWM4
Drive the turn-on and turn-off of end control metal-oxide-semiconductor Q1~Q4.
Wherein, single-chip microcontroller the model STM32F101RBT, Ui that single chip machine controlling circuit uses are input voltage sampling end
Mouth AN0, Uo are output voltage sample port AN2, and Io is that output current sample port AN1, AN5, AN6 are respectively that direct current is fed out
Direct current positive and negative busbar voltage-to-ground thief hatch in branch, four signals driving end and the power electronics breaker of PWM1~PWM4
Four metal-oxide-semiconductor Q1~Q4 are connected respectively.
It is above-mentioned based on the guard method of DC power supply active protective device of the substation of fault location, specifically include as
Lower step:
Step 1, the output voltage and electric current that direct current feeds out DC bus in branch are acquired by voltage and current sample circuit,
Single-chip microcontroller compares voltage and current sampled data and voltage and current setting value, carries out the pre- of short trouble according to comparing result
It surveys and judges；
Step 2, it while by ground fault detection circuit samples direct current and feeds out positive and negative busbar voltage-to-ground in branch, and
Sampled data is sent to single-chip microcontroller and carries out data processing and calculating, the prediction of positive and negative busbar ground fault is carried out according to calculated result
And judgement；
Step 3, single-chip microcontroller exports different control according to the fault type of the calculated result and prediction of step 1 and step 2
Signal, and corresponding control signal is transferred to power electronics breaker and is executed；When occur positive electrode bus or negative electrode bus ground connection
When failure, single-chip microcontroller, which provides control signal control power electronics breaker, to be continued to work normally, and is simultaneously emitted by corresponding failure branch
Alarm signal；When there is short trouble, single-chip microcontroller provides control signal control power electronics breaker and is in current limliting work
State is simultaneously emitted by the alarm signal of corresponding failure branch.
Wherein, in step 1, single-chip microcontroller instance sample output voltage data and output current data, the corresponding number of the two
Amount is respectively Uo_ AD and Io_ AD, output voltage compares the corresponding digital quantity U_ of threshold value when setting short trouble in single-chip microcontroller
SET, meanwhile, output electric current compares the corresponding digital quantity I_SET of threshold value when setting short trouble in single-chip microcontroller；Compare Uo_AD
With the size and I of U_SEToThe size of _ AD and I_SET, works as Uo_ AD < U_SET and IoWhen _ AD > I_SET, show to feed out branch
Short trouble occurs for road, and current limliting output signal is sent to power electronics breaker by single-chip microcontroller, while passing through failure alarm circuit
Issue short trouble alarm signal.
Wherein, in step 2, single-chip microcontroller carries out positive and negative busbar insulation against ground electricity according to the sampled value of positive and negative busbar voltage-to-ground
The calculating of resistance, the resistance value for obtaining positive and negative busbar insulation against ground resistance is respectively R+And R-；It sets obtained resistance value and in program
Positive and negative busbar insulation against ground resistance alarm threshold value is compared, and positive and negative busbar insulation against ground resistance alarm threshold value distinguishes R+_SET
And R-_SET, work as R+When < R+_SET, single-chip microcontroller report positive bus-bar insulation decline failure；Work as R_When < R-_SET, single-chip microcontroller report is negative
Bus insulation declines failure.
Wherein, single-chip microcontroller sampling positive and negative busbar voltage-to-ground data carry out the calculating of positive and negative busbar insulation against ground resistance,
Calculating process is as follows, wherein R1=R3, R2=R4, R5=R6；
It is closed S1, disconnects S2, be delayed certain time, and measurement positive and negative busbar voltage-to-ground is respectively U1+、U1-, it obtains:
S1 is disconnected, S2 is closed, be delayed certain time, and measurement positive and negative busbar voltage-to-ground is respectively U2+、U2-, it obtains:
Joint type (1) and (2) can obtain:
It is exhausted over the ground to carry out positive and negative busbar using formula (3) and formula (4) according to the sampled value of positive and negative busbar voltage-to-ground for single-chip microcontroller
The calculating of edge resistance, the resistance value for obtaining positive and negative busbar insulation against ground resistance is respectively R+And R-。
In DC power supply active protective device of the present invention, power electronics breaker is using Technics of Power Electronic Conversion technology come real
The transformation of existing DC voltage, becomes controllable direct current for the direct current of input, feeds out branch circuit load power supply to direct current, has disconnected
The voltage and current transfer function of road device；In addition, may be implemented by controlling turning on and off for power electronics breaker to load
Power whether there is or not control, cut-offs control function with breaker.
By acquiring the voltage-to-ground of the output voltage electric current and positive and negative busbar that feed out DC bus in branch, real-time detection
Direct current feeds out the working condition of branch, and according to sampled data, single-chip microcontroller carries out data processing, calculates related data as a result, simultaneously
Make the anticipation of short trouble information and fault alarm.
According to the calculated result of single-chip microcontroller and the fault type of anticipation, single-chip microcontroller controls power electronics breaker and executes phase
The active protection act of pass realizes excision or limitation to failure.
Compared with the prior art, technical solution of the present invention has the beneficial effect that
What DC power supply active protective device of the present invention not only may be implemented conventional circuit breaker cut-offs function, can also be real
The fast accurate positioning of direct current branch failure is now fed out, and prejudges failure in advance, to be carried out according to the difference of failure different
Active protection act, rather than as the tripping cutting load of conventional circuit breaker blindness, the overstepping failure of conventional circuit breaker is avoided,
Improve continuity, the reliability and security of the work of transforming plant DC power-supply system；The active protection of DC power supply of the present invention
Device is capable of the failure of faster lookup and positioning DC branch, reduces project amount, improves timeliness.
Detailed description of the invention
Fig. 1 is the systematic schematic diagram of active protective device of the present invention；
Fig. 2 is power electronics breaker schematic diagram；
Fig. 3 is that direct current feeds out grounding fault detection schematic diagram；
Fig. 4 is output current sampling circuit schematic diagram；
Fig. 5 is output voltage sampling circuit schematic diagram；
Fig. 6 is single chip machine controlling circuit schematic diagram；
Fig. 7 is that direct current feeds out branch, short-circuit calculation of fault flow chart；
Fig. 8 is direct current positive and negative busbar insulation against ground resistance calculations flow chart；
Fig. 9 is the control flow chart of single-chip microcontroller of the present invention.
Specific embodiment
According to following embodiments, the present invention may be better understood.However, as it will be easily appreciated by one skilled in the art that real
It applies content described in example and is merely to illustrate the present invention, without sheet described in detail in claims should will not be limited
Invention.
As shown in Figure 1, the present invention is based on the substation of fault location DC power supply active protective device, protective device
It is series at DC power supply and direct current is fed out between branch, DC bus (DC power supply) and every direct current feed out and be all provided between branch
Have protective device of the invention (each direct current feeds out parallel with one another between branch), the input terminal and direct current of protective device of the present invention are female
Line (DC power supply) connection, the output end of protective device of the present invention feed out branch with direct current and connect；The protective device includes monolithic
Machine control circuit and the power electronics breaker and fault detection circuit being connect with single chip machine controlling circuit, DC bus it is defeated
Outlet is connect with the input terminal of power electronics breaker, and the output end of power electronics breaker feeds out branch with corresponding direct current and connects
It connects, single chip machine controlling circuit control signal output is connect with power electronics breaker control signal input part；Fault detection electricity
Road includes voltage and current sample circuit and ground fault detection circuit；Protective device of the present invention further includes failure alarm circuit, therefore
Barrier warning circuit is connect with single chip machine controlling circuit.
Fig. 2 is the circuit diagram of power electronics breaker, and Uin is the input voltage of power electronics breaker, and Uo is electricity
The output voltage of power electronic circuit breaker, power tube Q1~Q4 are metal-oxide-semiconductor, and T is high-frequency isolation transformer, and Lr is resonant inductance, L1
For outputting inductance, D1~D4 is fast-recovery commutation diode；Four signals driving end of PWM1~PWM4 of single-chip microcontroller and electric power
Four metal-oxide-semiconductor Q1~Q4 of electronic circuit breaker are connected respectively, and four signals driving end of PWMi~PWM4 passes through control MOS
The turn-on and turn-off of pipe Q1~Q4, thus realize to load supplying whether there is or not control, i.e., by change PWM drive signal conducting
Time, change the turn-on time of power tube in power electronics breaker, the final adjusting realized to output voltage keeps output electricity
The stabilization of pressure.
Fig. 3 is the detection principle diagram that direct current feeds out grounding therefore detection circuit, and the power supply of direct current 220V is power electronics
The output voltage of breaker installs additional an isolating diode (D1 and D2) respectively on positive and negative busbar, this isolating diode is general
Logical rectifier diode；S1 and S2 is electronic switch, and R1 and R3 are balance resistor bridge, and R2 and R5 are positive Bus Voltage detection
Resistance, C1 are filter capacitor, and R4 and R6 are negative Bus Voltage detection resistance, and C2 is filter capacitor, and D3 and D4 are positive respectively
Negative busbar voltage-to-ground samples voltage limiting diode, and U+ and U- are positive and negative busbar sampled voltage over the ground, the sampled voltage point of U+ and U-
It is not sent to AN5 the and AN6 sample port of single chip machine controlling circuit.
Fig. 4 is output current sample schematic diagram, and output electric current is sampled by current sensor, high-amperage is converted
At small semaphore, current signal is converted by voltage signal by sampling resistor R5, C3 is filter capacitor, and D1 is two pole of pressure limiting
Pipe prevents the overtension into the port Chip Microcomputer A N1.
Fig. 5 is output voltage sampling principle figure, the high voltage of output after R1, R2, R3 decompression, by C1, C2 and
After R4 filtering, pressure limiting is carried out by D2 diode, the AN2 sample port of single chip machine controlling circuit is sent to, carries out output voltage
Sampling.
Fig. 6 is single chip machine controlling circuit schematic diagram, and the model STM32F101RBT, Ui of single-chip microcontroller are input voltage sampling
Port AN0, Uo are output voltage sample port AN2, and Io is output current sample port AN1, and Y indicates that crystal oscillator, C1, C2 are crystal oscillator
Capacitor, AN3 are temperature sampling port, and AN4 is analog input port, and AN5, AN6 are to feed out direct current positive and negative busbar pair in branch
Ground voltage sample port, direct current positive and negative busbar of the sampled input voltage in Fig. 3 sampled voltage (U+ and U-) over the ground, monolithic
PWM1~PWM4 signal driving end of machine is used to control four metal-oxide-semiconductors of power electronics breaker, 485R, 485T of single-chip microcontroller and
The port 485C is RS-485 communication interface, and single-chip microcontroller passes through its SPI communication interface (SDI, SCK, SDO) and human-computer interaction interface
Realize communication.
The present invention is based on the guard method of DC power supply active protective device of the substation of fault location, specifically:
On the one hand, DC power supply active protective device of the present invention is acquired by voltage sampling circuit feeds out in branch directly
The output voltage (i.e. voltage of the output to load) of bus is flowed, DC bus high voltage is by decompression, filtering and pressure limiting processing
Afterwards, the sampled data of low-voltage is sent to the sampling pin of the AD in single chip machine controlling circuit, single-chip microcontroller is sampled by AD, will be simulated
Amount is converted into digital quantity, then passes through software filtering and data processing, and single-chip microcontroller obtains the number of final voltage sample data
Measure Uo_AD；
DC power supply active protective device acquires the output electricity for feeding out DC bus in branch using current sensor
Stream, in current sampling circuit, is converted into the small signal of suitable voltage for Small Current Signal by sampling resistor, then through filtering
After wave and pressure limiting processing, the sampled data of low-voltage is sent to the sampling pin of the AD in single chip machine controlling circuit, single-chip microcontroller passes through
AD sampling, is converted into digital quantity for analog quantity, then passes through software filtering and data processing, and single-chip microcontroller obtains final electric current and adopts
The digital quantity I of sample datao_AD；
Output voltage compares the corresponding digital quantity U_SET of threshold value when setting short trouble in scm software program, together
When, output electric current compares the corresponding digital quantity I_SET of threshold value when setting short trouble in scm software program, and exports short
The condition of road judgement is that output voltage is less than setting value, and output electric current is greater than the set value, and the two will meet simultaneously；
After DC power supply active protective device works normally, single-chip microcontroller instance sample output voltage data and output electricity
Flow data, the corresponding digital quantity of the two is respectively Uo_ AD and Io_ AD, compares U in software programoThe size of _ AD and U_SET
And IoThe size of _ AD and I_SET, works as Uo_ AD < U_SET and IoWhen _ AD > I_SET, show that short circuit event occurs for feeder line branch
Barrier, DC power supply active protective device carry out current limliting output and issue short trouble alarm signal, and record failure generation
Moment.
On the other hand, DC power supply active protective device is fed out positive and negative in branch by ground fault detection circuit acquisition
The sampled data of low-voltage is sent to by Bus Voltage, DC bus high voltage after decompression, filtering and pressure limiting processing
AD in single chip machine controlling circuit samples pin, and single-chip microcontroller is sampled by AD, analog quantity is converted into digital quantity, then by soft
Part filtering and data processing, single-chip microcontroller obtain the digital quantity U of final positive and negative busbar voltage-to-ground sampled data+_ AD and U-_
AD。
In Fig. 3, after DC power supply active protective device works normally, single-chip microcontroller samples positive and negative busbar voltage-to-ground number
According to come the calculating that carries out positive and negative busbar insulation against ground resistance, calculating process is as follows, wherein R1=R3, R2=R4, R5=R6
It is closed S1, disconnects S2, be delayed certain time, and measurement positive and negative busbar voltage-to-ground is respectively U1+、U1-, it obtains:
S1 is disconnected, S2 is closed, be delayed certain time, and measurement positive and negative busbar voltage-to-ground is respectively U2+、U2-, it obtains:
Joint type (1) and (2) can obtain:
It is exhausted over the ground to carry out positive and negative busbar using formula (3) and formula (4) according to the sampled value of positive and negative busbar voltage-to-ground for single-chip microcontroller
The calculating of edge resistance, the resistance value for obtaining positive and negative busbar insulation against ground resistance is respectively R+And R-.Positive and negative mother is set in software program
Line insulation against ground resistance alarm threshold value, difference R+_SET and R-_SET；Work as R+When < R+_SET, under the insulation of single-chip microcontroller report positive bus-bar
Failure drops；Work as R_When < R-_SET, single-chip microcontroller report negative busbar insulation decline failure；The insulation of single-chip microcontroller moment monitoring DC bus
Situation realizes failure real time alarm function, and records failure and the moment occurs, while controlling electric power electric transformer and continuing to direct current
Load power supply, guarantees the continuity of branch load power supply.
The present invention is based on the substation of fault location DC power supply active protective device control principles:
The control of electrical communications function: i.e. power electronics breaker realizes DC voltage using Technics of Power Electronic Conversion technology
Transformation, the direct current of input is become into controllable direct current, to direct current feed out branch circuit load power supply, with breaker voltage
Electric current transfer function；In addition, by control power electronic devices turn on and off may be implemented to load supplying whether there is or not control
System cut-offs control function with breaker.
The control of DC Line Fault detection judgement: voltage and current and the DC Line Fault inspection of inside of branch are fed out by acquiring
The data of unit are surveyed, real-time detection direct current feeds out the working condition of branch, and according to detection sampled data, single-chip microcontroller is carried out at data
Reason calculates related data as a result, and making fault message anticipation and fault alarm.
The control that active protection act is realized: the fault type of the result and anticipation that are calculated according to detection unit, monolithic
Machine controls power electronics breaker and executes relevant active protection act, realizes excision or limitation to failure.
The specific implementation step of control method of the present invention: after system electrification, single chip machine controlling circuit is operated normally, single-chip microcontroller
Initialization is completed, starts to execute software program；By sample circuit come sampled voltage current data, the AD for being sent to single-chip microcontroller is adopted
Sample mouth carries out filtering and the Correlation method for data processing of sampled data, including short trouble counting subroutine, ground connection inside single-chip microcontroller
Calculation of fault subprogram and control program.
The present invention is based on the substations of fault location to be achieved in that i.e. monolithic with the active guard method of DC power supply
Machine controls power electronics normal operation of circuit breaker, feeds out branch to direct current according to the data after sampling processing, output control signal
Load supplying；While normal power supply, by Fig. 4,5 and 7 it is found that by the sampling to output voltage electric current, single-chip microcontroller processing
Sampled data carries out the prediction and judgement of short trouble according to data result；By Fig. 3 and Fig. 8 it is found that by feeding out grounding
Detection circuit realizes the sampling of positive and negative busbar voltage-to-ground, is sent to single-chip microcontroller and carries out data processing and calculating, ties according to calculating
The prediction and judgement of fruit progress positive or negative pole ground fault；As shown in Figure 9, single-chip microcontroller is according to the failure of calculated result and prediction
Type, exports different control signals, and power electronics breaker executes different active protection acts；When there is positive or negative pole
When ground fault, single-chip microcontroller, which provides control signal control power electronics breaker, to be continued to work normally, and is simultaneously emitted by corresponding failure
The alarm signal of branch；When there is short trouble, single-chip microcontroller provides control signal control power electronics breaker and is in current limliting
Working condition avoids the overstepping of conventional circuit breaker, is simultaneously emitted by the alarm signal of corresponding failure branch；Maintenance personnel's root
According to alarm signal, the investigation work of failure can be carried out rapidly with fast accurate positioning failure branch.
Therefore, what DC power supply active protective device of the present invention not only may be implemented conventional circuit breaker cut-offs function, also
It may be implemented to feed out the fast accurate positioning function of branch DC Line Fault, and prejudge failure in advance, carried out not according to failure difference
Same active protection act, rather than the tripping cutting load of conventional circuit breaker blindness, so as to avoid the leapfrog of conventional circuit breaker
Tripping fault improves continuity, the reliability and security of the work of transforming plant DC power-supply system.
Claims (8)
1. based on the substation of fault location DC power supply active protective device, it is characterised in that: DC bus and every
Direct current feeds out and is equipped with the protective device between branch, and the protective device includes single chip machine controlling circuit and and single-chip microcontroller
The power electronics breaker and fault detection circuit of control circuit connection, output end and the power electronics breaker of DC bus
Input terminal connection, the output end of power electronics breaker feed out branch connection, single chip machine controlling circuit control with corresponding direct current
Signal output end is connect with power electronics breaker control signal input part；Fault detection circuit includes voltage and current sample circuit
And ground fault detection circuit.
2. according to claim 1 based on the substation of fault location DC power supply active protective device, feature
Be: the protective device further includes failure alarm circuit, and failure alarm circuit is connect with single chip machine controlling circuit.
3. according to claim 1 based on the substation of fault location DC power supply active protective device, feature
Be: power electronics breaker includes voltage input end Uin, voltage output end Uo, metal-oxide-semiconductor Q1~Q4, high-frequency isolation transformer
T, resonant inductance Lr, outputting inductance L1 and rectifier diode D1~D4, four signals driving of PWM1~PWM4 of single-chip microcontroller
It holds and is connected respectively with four metal-oxide-semiconductor Q1~Q4 of power electronics breaker.
4. according to claim 1 based on the substation of fault location DC power supply active protective device, feature
Be: single-chip microcontroller model STM32F101RBT in single chip machine controlling circuit, Ui are input voltage sample port AN0, and Uo is defeated
Voltage sample port AN2 out, Io are that output current sample port AN1, AN5, AN6 are respectively that feed out direct current in branch positive and negative for direct current
Bus Voltage thief hatch, PWM1~PWM4 four signals driving end and power electronics breaker four metal-oxide-semiconductor Q1~
Q4 is connected respectively.
5. Claims 1 to 4 it is any it is described based on the substation of fault location with the guarantor of DC power supply active protective device
Maintaining method, which is characterized in that specifically comprise the following steps:
Step 1, the output voltage and electric current that direct current feeds out DC bus in branch, monolithic are acquired by voltage and current sample circuit
Machine compares voltage and current sampled data and voltage and current setting value, according to comparing result carry out short trouble prediction and
Judgement；
Step 2, it while by ground fault detection circuit samples direct current and feeds out positive and negative busbar voltage-to-ground in branch, and will adopt
Sample data are sent to single-chip microcontroller and carry out data processing and calculating, carry out the prediction of positive and negative busbar ground fault according to calculated result and sentence
It is disconnected；
Step 3, single-chip microcontroller exports different control letters according to the fault type of the calculated result and prediction of step 1 and step 2
Number, and corresponding control signal is transferred to power electronics breaker and is executed；When occur positive electrode bus or negative electrode bus ground connection therefore
When barrier, single-chip microcontroller, which provides control signal control power electronics breaker, to be continued to work normally, and is simultaneously emitted by corresponding failure branch
Alarm signal；When there is short trouble, single-chip microcontroller provides control signal control power electronics breaker and is in current limliting work shape
State is simultaneously emitted by the alarm signal of corresponding failure branch.
6. the protection side of substation's DC power supply active protective device according to claim 5 based on fault location
Method, it is characterised in that: in step 1, single-chip microcontroller instance sample output voltage data and output current data, the corresponding number of the two
Amount is respectively Uo_ AD and Io_ AD, output voltage compares the corresponding digital quantity U_ of threshold value when setting short trouble in single-chip microcontroller
SET, meanwhile, output electric current compares the corresponding digital quantity I_SET of threshold value when setting short trouble in single-chip microcontroller；Compare Uo_AD
With the size and I of U_SEToThe size of _ AD and I_SET, works as Uo_ AD < U_SET and IoWhen _ AD > I_SET, show to feed out branch
Short trouble occurs for road, and current limliting output signal is sent to power electronics breaker by single-chip microcontroller, while passing through failure alarm circuit
Issue short trouble alarm signal.
7. the protection side of substation's DC power supply active protective device according to claim 5 based on fault location
Method, it is characterised in that: in step 2, single-chip microcontroller carries out positive and negative busbar insulation against ground according to the sampled value of positive and negative busbar voltage-to-ground
The calculating of resistance, the resistance value for obtaining positive and negative busbar insulation against ground resistance is respectively R+And R-；It sets obtained resistance value and in program
Positive and negative busbar insulation against ground resistance alarm threshold value be compared, positive and negative busbar insulation against ground resistance alarm threshold value distinguish R+_SET
And R-_SET, work as R+< R+-When SET, single-chip microcontroller report positive bus-bar insulation decline failure；Work as R-< R--When SET, the negative mother of single-chip microcontroller report
Line insulation decline failure.
8. the protection side of substation's DC power supply active protective device according to claim 7 based on fault location
Method, it is characterised in that: single-chip microcontroller samples positive and negative busbar voltage-to-ground data to carry out the calculating of positive and negative busbar insulation against ground resistance,
Calculating process is as follows, wherein R1=R3, R2=R4, R5=R6；
It is closed S1, disconnects S2, be delayed certain time, and measurement positive and negative busbar voltage-to-ground is respectively U1+、U1-, it obtains:
S1 is disconnected, S2 is closed, be delayed certain time, and measurement positive and negative busbar voltage-to-ground is respectively U2+、U2-, it obtains:
Joint type (1) and (2) can obtain:
Single-chip microcontroller carries out positive and negative busbar insulation against ground electricity using formula (3) and formula (4) according to the sampled value of positive and negative busbar voltage-to-ground
The calculating of resistance, the resistance value for obtaining positive and negative busbar insulation against ground resistance is respectively R+And R-。
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