CN110398668A - A kind of looped network of DC power on-line monitoring system and method - Google Patents
A kind of looped network of DC power on-line monitoring system and method Download PDFInfo
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- CN110398668A CN110398668A CN201910860147.0A CN201910860147A CN110398668A CN 110398668 A CN110398668 A CN 110398668A CN 201910860147 A CN201910860147 A CN 201910860147A CN 110398668 A CN110398668 A CN 110398668A
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01—MEASURING; TESTING
- 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
- G01R31/088—Aspects of digital computing
Abstract
The present invention relates to power monitoring technical fields, and specifically disclosing a kind of looped network of DC power on-line monitoring system and method, the monitoring system includes: the first direct current system, including I section of bus, I charger circuit and I battery circuit；Second direct current system, including II section of bus, II charger circuit and II battery circuit；Mother circuit connects I section of bus and II section of bus by a bus connection switch；Current acquisition system, for detecting the electric current in I charger circuit, I battery circuit and mother circuit three respectively.The present invention provides a kind of looped network of DC power on-line monitoring system and method, can fast and effeciently judge whether there is looped network of DC power, improves identification effect and differentiates accuracy, guarantees the stable operation of network system.
Description
Technical field
The present invention relates to power monitoring technical field more particularly to a kind of looped network of DC power on-line monitoring system and methods.
Background technique
In electric system, power plant, substation and communications equipment room use direct current system all as the interior protective relaying device, control of standing
The offers such as circuit, monitoring device and communication equipment processed reliably work and electrical source of power.Direct current system pacifies power infrastructures
Full stable operation plays very important effect, mainly by charger, battery group, DC bus, monitor, switching (contact)
The part such as handle and feeder unit forms.
Related regulation forbids direct current system the case where loop-net operation occur in plain text, i.e., when two group storage battery groups and charger all
In the case where investment, each battery and corresponding charger, DC bus and load must independent operatings.Two systems it
Between cannot have any connection.When the purpose is to prevent wherein certain a set of direct current system generation ground connection or short circuit, if two systems
There are looped networks, then another set of system is involved also instant earthing or short circuit, so will lead to two sets of direct current systems of whole station while losing
Pressure, leads to the significant problems such as false protection or tripping.
However, direct current system load outlet is numerous, throughout whole station, it is easy to happen between two sets of direct current systems and gangs up and formed
Looped network.And to guarantee power supply, important DC load is all the dual wiring of two systems, is moved back using the throwing that direct current is spaced apart to select to adopt
It is powered with certain set direct current system, it is another set of spare.Looped network is formed once being spaced apart miscarrying.Looped network of DC power is very hidden, normal to transport
It there is no any sign when row, is just found after accident event occurs, such as a set of DC system grounding or decompression
Cause two sets and meanwhile ground connection or decompression.Or the inspection that has a power failure finds to find that there are looped networks when parasitic loop.
To sum up, currently, running direct current system cannot achieve on-line checking with the presence or absence of looped network, it is completely dependent on artificial behaviour
Work and experience, low efficiency, speed is slow, and error probability is high, lacks effective technological means.If two systems are constantly in looped network
Operating status, once certain set system failure, will lead to two systems simultaneous faults, seriously threaten power system security.
Therefore, there is an urgent need to develop looped network of DC power on-line monitoring system, for fast and effeciently judging whether there is direct current
Looped network.
Summary of the invention
It is an advantage of the invention to provide a kind of looped network of DC power on-line monitoring system and methods, can be fast and effeciently
Looped network of DC power is judged whether there is, identification effect is improved and differentiates accuracy, guarantees the stable operation of network system.
To achieve these objectives, on the one hand, the present invention provides a kind of looped network of DC power on-line monitoring system, comprising:
First direct current system, first direct current system include I section of bus, I charger circuit and I battery circuit, institute
It states I charger circuit and I battery circuit parallel connection accesses in I section of bus；
Second direct current system, second direct current system include II section of bus, II charger circuit and II battery circuit,
II charger circuit and II battery circuit parallel connection access in II section of bus；
Mother circuit, the mother circuit connect I section of bus and II section of bus by a bus connection switch；It is described
Bus connection switch is equipped with the location assistance contact for acquiring its folding condition；
Current acquisition system, the current acquisition system for detecting I charger circuit, I battery circuit and mother respectively
Join the electric current of circuit three.
Preferably, the current acquisition system includes first current transformer in series connection access I charger circuit, string
Couple the 7th Current Mutual Inductance that the mother circuit is accessed into second current transformer in I battery circuit and series connection
Device.
Preferably, II charger circuit is equipped with II charge switch, and II battery circuit is switched equipped with II electric power storage.
Preferably, further include processing chip and warning device, the processing chip respectively with the current acquisition system and
Warning device electrical connection.
It preferably, further include printing equipment for printing monitoring report, the processing chip and printing equipment electricity
Connection.
On the other hand, a kind of looped network of DC power on-line monitoring method is also provided, it is online to be suitable for any of the above-described kind of looped network of DC power
Monitoring system, which comprises
To the location assistance contact Fm of the electric current Ic1 in I charger circuit, the electric current Ix1 in I battery circuit and bus connection switch
It is monitored；
When I battery circuit is in floating charge state, when the location status of the bus connection switch changes, according to the mother
The situation of change for joining the electric current Ix1 of the electric current Im in circuit, the electric current Ic1 in I charger circuit and I battery circuit judges whether to deposit
In looped network of DC power.
Preferably, described when I battery circuit is in floating charge state, the location status of the bus connection switch changes
When, according to the variation of the electric current Ix1 of the electric current Im in the mother circuit, the electric current Ic1 in I charger circuit and I battery circuit
Situation judges whether there is looped network of DC power, comprising:
When the bus connection switch switches to closed state by disjunction state, if the changing value of the electric current Im in mother circuit exists
Within the scope of allowable error；And/or when the bus connection switch switches to disjunction state by closed state, the electricity in I charger circuit
The difference of the electric current Ix1 in Ic1 and I battery circuit is flowed within the scope of allowable error, then the first direct current system and the second direct current system
Looped network is not present in system.
Preferably, described when I battery circuit is in floating charge state, the location status of the bus connection switch changes
When, according to the variation of the electric current Ix1 of the electric current Im in the mother circuit, the electric current Ic1 in I charger circuit and I battery circuit
Situation judges whether there is looped network of DC power, further includes:
When the bus connection switch switches to closed state by disjunction state, if the changing value of the electric current Im in mother circuit is super
Allowable error range out；And/or when the bus connection switch switches to disjunction state by closed state, the electricity in I charger circuit
The difference for flowing the electric current Ix1 in Ic1 and I battery circuit exceeds allowable error range, then the first direct current system and the second direct current system
There are looped networks for system.
Preferably, described when I battery circuit is in floating charge state, the location status of the bus connection switch changes
When, according to the variation of the electric current Ix1 of the electric current Im in the mother circuit, the electric current Ic1 in I charger circuit and I battery circuit
Situation judges whether there is looped network of DC power, comprising:
When the bus connection switch switches to closed state by disjunction state, the changing value of the electric current Im in mother circuit is being permitted
Perhaps error range is interior and continues third time span T3；Alternatively,
When the bus connection switch switches to disjunction state by closed state, the electric current Ic1 in I charger circuit and I electric power storage
The difference of the electric current Ix1 in pond circuit is within the scope of allowable error and continues third time span T3；Alternatively,
When the bus connection switch switches to closed state by disjunction state, the changing value of the electric current Im in mother circuit is being permitted
Perhaps in error range, and when the bus connection switch switches to disjunction state by closed state, the electric current Ic1 in I charger circuit
Difference with the electric current Ix1 in I battery circuit continues the 4th time span T4 within the scope of allowable error, then the first direct current system
Looped network is not present in system and the second direct current system；Wherein, T3 > T4.
Preferably, described when I battery circuit is in floating charge state, the location status of the bus connection switch changes
When, according to the variation of the electric current Ix1 of the electric current Im in the mother circuit, the electric current Ic1 in I charger circuit and I battery circuit
Situation judges whether there is looped network of DC power, further includes:
When the bus connection switch switches to closed state by disjunction state, the changing value of the electric current Im in mother circuit exceeds
Allowable error range simultaneously continues third time span T3；Alternatively,
When the bus connection switch switches to disjunction state by closed state, the electric current Ic1 in I charger circuit and I electric power storage
The difference of the electric current Ix1 in pond circuit is beyond allowable error range and continues third time span T3；Alternatively,
When the bus connection switch switches to closed state by disjunction state, the changing value of the electric current Im in mother circuit exceeds
Allowable error range, and when the bus connection switch switches to disjunction state by closed state, the electric current Ic1 in I charger circuit
Exceed allowable error range with the difference of the electric current Ix1 in I battery circuit, continues the 4th time span T4, then the first direct current system
There are looped networks with the second direct current system for system.
The beneficial effects of the present invention are: a kind of looped network of DC power on-line monitoring system and method are provided, it can be fast and effeciently
Looped network of DC power is judged whether there is, identification effect is improved and differentiates accuracy, guarantees the stable operation of network system.
Detailed description of the invention
It, below will be to embodiment or existing skill in order to illustrate more clearly of the present embodiment or technical solution in the prior art
Attached drawing needed in art description is briefly described, it should be apparent that, the accompanying drawings in the following description is only the present invention
Some embodiments for those of ordinary skill in the art without any creative labor, can be with root
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is the circuit diagram of looped network of DC power on-line monitoring system provided in an embodiment of the present invention；
Fig. 2 is the structural block diagram of looped network of DC power on-line monitoring system provided in an embodiment of the present invention；
Fig. 3 is the flow chart of looped network of DC power on-line monitoring method provided by Embodiment 2 of the present invention；
Fig. 4 is the flow chart for the looped network of DC power on-line monitoring method that the embodiment of the present invention three provides.
In figure:
101, I section of bus；102, I charging unit；103, I battery group；
201, II section of bus, 202, II charging unit；203, II battery group；
301, first voltage mutual inductor；302, second voltage mutual inductor；303, tertiary voltage mutual inductor；304, the 4th voltage
Mutual inductor；305, the 5th voltage transformer；306, the 6th voltage transformer；
401, the first current transformer；402, the second current transformer；403, third current transformer；404, the 4th electric current
Mutual inductor；405, the 5th current transformer；406, the 6th current transformer；407, the 7th current transformer；
501, I charge switch；502, I electric power storage switchs；503, II charge switch；504, II electric power storage switchs；505, mother is opened
It closes；
6, chip is handled；7, warning device；8, printing equipment.
Specific embodiment
To enable the purpose of the present invention, feature, advantage more obvious and understandable, below in conjunction in the present embodiment
Attached drawing, the technical solution in the present embodiment is clearly and completely described, it is clear that the embodiments described below are only
It is a part of the embodiment of the present invention, and not all embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art
All other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Embodiment one
Looped network of DC power on-line monitoring system provided in this embodiment can be used for executing the direct current of the embodiment of the present invention offer
Looped network on-line monitoring method has corresponding function and beneficial effect.
Referring to FIG. 1 to FIG. 2, a kind of looped network of DC power on-line monitoring system, including the first direct current system, the second direct current system,
Mother circuit, System of voltage acquisition and current acquisition system.
Wherein, first direct current system includes I section of bus 101, I charger circuit and I battery circuit, and described I fills
Electric motor loop and I battery circuit parallel connection access in I section of bus 101.Second direct current system includes II section of bus
201, II charger circuit and II battery circuit, II charger circuit and II battery circuit parallel connection access described II section
In bus 201.The mother circuit connects I section of bus 101 and II section of bus 201 by a bus connection switch 505；Institute
Bus connection switch 505 is stated equipped with the location assistance contact for acquiring its folding condition.The System of voltage acquisition for examining respectively
I section of bus 101, I charger circuit, I battery circuit, II section of bus 201, II charger circuit and II battery is surveyed to return
The voltage of Lu Liuzhe.The current acquisition system for detecting I charger circuit, I battery circuit, I charger circuit respectively
It is dry with the main line in I battery circuit, II charger circuit, II battery circuit, II charger circuit and II battery circuit
The electric current on road and mother circuit.Preferably, ± KM1 is I section of bus 101, and ± KM2 is II section of bus 201.I charger
Circuit is equipped with I charging unit 102, and I battery circuit is equipped with I battery group 103, and II charger circuit is equipped with II charging unit
202, II battery circuit is equipped with II battery group 203.
Specifically, the System of voltage acquisition includes the first voltage mutual inductor in parallel accessed in I section of bus 101
301, the second voltage mutual inductor 302 in access I charger circuit in parallel, parallel connection access in I battery circuit
Tertiary voltage mutual inductor 303, the 4th voltage transformer 304 in parallel accessed in II section of bus 201, access described II in parallel
The 6th voltage transformer in the 5th voltage transformer 305 and access II battery circuit in parallel in charger circuit
306。
The current acquisition system includes first current transformer 401 in series connection access I charger circuit, series connection
Enter the dry of second current transformer 402 in I battery circuit, series connection access I charger circuit and I battery circuit
The third current transformer 403 on road, the 4th current transformer 404 in series connection access II charger circuit, series connection access institute
State the dry of the 5th current transformer 405 in II battery circuit, series connection access II charger circuit and II battery circuit
6th current transformer 406 on road and series connection access the 7th current transformer 407 in the mother circuit.
It is understood that System of voltage acquisition and current acquisition system are the secondary device of direct current system, for adopting
Collect the electric current stream and voltage value of each point.
For the first direct current system, I section of bus 101 is for summarizing and to each feeder line transmission power；The storage of I battery group 103
Standby backup power source of the electricity as I section of bus 101 provides certain capacity when I charging 102 failure of unit for I section of bus 101
Energy, guarantee DC load keep operating normally within a certain period of time；I charging unit 102 for being I when operating normally in real time
Section bus 101 provides power, while carrying out floating charge to I battery group 103, and charging finishes, to be kept for 103 moment of I battery group
It is spare to store up full energy, I battery group 103 is filled.Similarly, details are not described herein again for second direct current system.
The a kind of for (putting) electric working method of battery group it should be noted that so-called floating charge, i.e., by battery group with
Charger is connected on load circuit, and charger output voltage is only slightly higher than the end voltage of battery group, and a small amount of charging current is come
Compensate the local action of battery group loss, with can be always maintained at charging meet state and will not overcharge；It is so-called equal
It fills, i.e. charger (generally 9 days) auto lifting high output voltage (such as 110V direct current system, charging when filling at regular intervals
Voltage is than improving 5.2 volts when floating charge), it significantly charges (charging current significantly increases) to battery, guarantees that battery is in full and holds
Amount state.Settable definite-time is filled to carry out automatically, it can also force start at any time.
The monitoring method that embodiment two and embodiment three provide makes full use of the charging of monitoring system provided in this embodiment
Machine can automatic or force an equalizing charge, the characteristics of electric current significantly increases is raised and exported to output voltage when filling, and then to whether there is
Looped network of DC power carries out accurate judgement.
Looped network of DC power on-line monitoring system further includes processing chip 6, warning device 7 and the printing for printing examining report
Device 8, the processing chip 6 are electric with the System of voltage acquisition, current acquisition system, warning device 7 and printing equipment 8 respectively
Connection carries out operation and judgement for the monitoring result to System of voltage acquisition and current acquisition system, obtains with the presence or absence of straight
The conclusion of looped network is flowed, if it exists looped network of DC power, then controls printing equipment 8 and print monitoring report and send alarm to warning device 7
Instruction.
Preferably, warning device 7 can have the equipment of alarm function for warning lamp, buzzer or smart phone etc.,
The information warnings such as text, flash of light, sound and vibration can be issued.
Preferably, I charger circuit be equipped with I charge switch 501, I battery circuit be equipped with I electric power storage switch 502, II
Charger circuit is equipped with II charge switch 503, and II battery circuit is equipped with II electric power storage switch 504.
When normal operation, I charging unit 102 and I battery group 103 are all connected to I section of bus 101, II charging unit 202
It is all connected to II section of bus 201 with II battery group 203, bus connection switch 505 is in an off state, other switches are in closure
State, two sets of direct current system fanout operations.Under individual cases, when wherein a group storage battery needs out of service (for example overhaul
Or core holds), it is closed bus connection switch 505, at this time two systems paired running, and the corresponding electric power storage switch of the battery pack is disconnected,
Battery pack and isolation of system, it is out of service.Similarly, (such as maintenance or core when wherein one group of charging unit needs out of service
Hold), it is closed bus connection switch 505, at this time two systems paired running, and the corresponding charge switch of the charging unit is disconnected, filled
Motor group and isolation of system, it is out of service.
Looped network of DC power on-line monitoring system provided in this embodiment can be used for what embodiment two or embodiment three provided
In looped network of DC power on-line monitoring method, looped network of DC power can be fast and effeciently judged whether there is.
Embodiment two
The present embodiment provides a kind of looped network of DC power on-line monitoring methods, the application scenarios suitable for power monitoring field,
The efficiency of grid operating monitoring can be improved, the looped network of DC power on-line monitoring method is by a kind of looped network of DC power on-line monitoring system
It executes, passes through software and or hardware realization.
Referring to Fig. 3, the looped network of DC power on-line monitoring method includes the following steps:
S201: to the electric current Ic1 of the voltage U2 of the voltage U1 of I section of bus 101, II section of bus 201, I charger circuit, II
The electric current Ix2 of the electric current Ic2 in charger circuit, the electric current Ix1 in I battery circuit and II battery circuit are monitored.
S202: when the bus connection switch 505 is in disjunction state, and I battery circuit is switched to rush by floating charge, according to institute
State the voltage U1 of I section of bus 101, the voltage U2 of II section of bus 201, the electric current Ic1 in I charger circuit, II charger circuit
The situation of change of the electric current Ix2 of electric current Ic2, the electric current Ix1 in I battery circuit and II battery circuit judge whether there is direct current
Looped network.
Under normal circumstances, (bus connection switch 505 disconnects two sets of direct current system fanout operations, the electric current Im in mother circuit in standing
It is that zero), two battery groups are in floating charge state.At regular intervals, the unit that charges (turns equal by floating charge automatically to battery group
Fill (filling can automatically engage, and can also force to put into).It is illustrated so that the first direct current system is turned to fill by floating charge as an example below, the
Two direct current systems are similarly.When the first direct current system is turned to fill by floating charge, the electric current that I charging unit 102 exports increases, and mentions simultaneously
The voltage U1 of high output voltage, I section of bus 101 can be lifted therewith and generate pressure difference with I battery group 103, form high current pair
Battery group charges.At this time:
S2021a: if the electricity of the voltage U2 of II section of bus 201, the electric current Ic2 in II charger circuit and II battery circuit
The changing value of Ix2 three is flowed within the scope of allowable error；And/or if the electric current Ic1 in I charger circuit increase Δ Ic1
Difference between the increase Δ Ix1 of the electric current Ix1 in I battery circuit is within the scope of allowable error, then the first direct current system
Looped network is not present with the second direct current system.
It is understood that the voltage U2 of II section of bus 201, the electric current Ic2 in II charger circuit and II battery circuit
Electric current Ix2 three changing value within the scope of allowable error, i.e., U2, Ic2 and Ix2 are held essentially constant, and illustrate that second is straight
Streaming system not by the first direct current system and influence, so be not present looped network of DC power.
The increase Δ Ix1 of the increase Δ Ic1 of the electric current Ic1 in the I charger circuit and electric current Ix1 in I battery circuit
Between difference within the scope of allowable error, i.e. Δ Ic1 ≈ Δ Ix1, illustrate it is all from I charging unit 102 flow out electric currents it is equal
I battery group 103 is flowed through, so looped network of DC power is not present.
S2022a: if the voltage U2 moment of II section of bus 201 is raised to, i.e. Δ U1 consistent with the voltage U1 of I section of bus 101
Difference with Δ U2 is within the scope of allowable error；And/or the difference of (Δ Ic1- Δ Ix1) and (Δ Ix2- Δ Ic2) are allowing to miss
In poor range, then there are looped networks for the first direct current system and the second direct current system.
It is understood that if the voltage U2 moment of II section of bus 201 be raised to it is consistent with the voltage U1 of I section of bus 101,
That is Δ U1 ≈ Δ U2 illustrates that there are accesses between II section of bus 201 and I section of bus 101, and bus connection switch 505 is in disjunction shape
State, so there are looped network of DC power.
The difference of (Δ Ic1- Δ Ix1) and (Δ Ix2- Δ Ic2) is within the scope of allowable error, i.e. (Δ Ic1- Δ Ix1) ≈
(ΔIx2-ΔIc2).The amount of electric current increase close to the half of I charging unit 102, which passes through, to be sent at looped network to II section of bus 201 is counter
Electricity fills while being lifted II section of 201 voltage of bus to II battery group 203, is equivalent to I charging unit 102 simultaneously to two groups
Battery group is filled.So the electric current of II battery group 203 increases, while the electric current that II charging unit 202 exports is reduced,
According to Kirchhoff's current law (KCL), Δ Ic1- Δ Ix1=Δ Ix2- Δ Ic2 (wherein Δ Ic2 is negative value), considers bus electricity at this time
A small amount of promoted is pressed to influence less load current, settable allowable error range is used to judge, i.e. (Δ Ic1- Δ Ix1) ≈ (Δ
Ix2- Δ Ic2) when, then it is assumed that there are looped network of DC power.
To sum up, when bus connection switch 505 is in disjunction state, I battery group 103 is turned to fill by floating charge, and there are voltages and electricity
Stream two can be used for judging whether there is between two systems the judgment basis of looped network, any one condition satisfaction can determine whether to deposit
In looped network.
Lead to device to prevent in direct current system voltage transformer or current mulual inductor malfunction to lead to not correctly to acquire
Erroneous judgement, the final thing reported looped network by mistake or refuse to submit looped network occur, while the present embodiment combination the two conditions of voltage and current,
It is further added by duration judgment basis, carries out comprehensive descision.I.e. when electric current and voltage, which only have a condition, to be met, it is necessary to pass through
Longer first time length T1 can just export alarm, when two conditions of electric current and voltage meet simultaneously, through shorter second
Time span T2 can export alarm.Realize optimal policy.It is specific as follows:
S2021b: if the electricity of the voltage U2 of II section of bus 201, the electric current Ic2 in II charger circuit and II battery circuit
The changing value of stream Ix2 three within the scope of allowable error and continues first time length T1；Alternatively, if I charger circuit
Difference between the increase Δ Ic1 of electric current Ic1 and the increase Δ Ix1 of the electric current Ix1 in I battery circuit is in allowable error model
In enclosing and continue first time length T1；Alternatively, if the electric current Ic2 and II of the voltage U2 of II section of bus 201, II charger circuit
The changing value of the electric current Ix2 three in battery circuit is within the scope of allowable error, and the increasing of the electric current Ic1 in I charger circuit
Difference between a large amount of Δ Ic1 and the increase Δ Ix1 of the electric current Ix1 in I battery circuit continues the within the scope of allowable error
Two time span T2, then looped network is not present in the first direct current system and the second direct current system；Wherein, TI is greater than T2；
S2022b: if the voltage U2 moment of II section of bus 201 is raised to, i.e. Δ U1 consistent with the voltage U1 of I section of bus 101
Within the scope of allowable error and continue first time length T1 with the difference of Δ U2；Alternatively, (Δ Ic1- Δ Ix1) and (Δ Ix2-
Δ Ic2) difference within the scope of allowable error and continue first time length T1；Alternatively, if the voltage U2 wink of II section of bus 201
Between be raised to consistent with the voltage U1 of I section of bus 101, i.e. the difference of Δ U1 and Δ U2 are within the scope of allowable error and (Δ Ic1-
Δ Ix1) with the difference of (Δ Ix2- Δ Ic2) within the scope of allowable error, continue the second time span T2, then the first direct current system
There are looped networks with the second direct current system.
It should be noted that different allowable error ranges should be set in different occasions in above steps, into
One step, allowable error range is smaller, and easier to fail to report, allowable error range is bigger, easier wrong report, permitting in different step
Perhaps error range can be taking human as being adjusted.
In this present embodiment, when finding that the first direct current system and the second direct current system there are when looped network, can send warning
Information and printing monitoring report remind the maloperation of electric power personnel timely correction and eliminate looped network connection position to inform electric power personnel,
Avoid whole station DC voltage losing major accident event.
Looped network of DC power on-line monitoring method provided in this embodiment can be used for the direct current ring in power monitoring technical field
Net monitoring situation quickly judged by the voltage and current situation of change in each circuit with the presence or absence of looped network of DC power, can be with
Statistical efficiency is effectively improved, manpower is saved, improve accuracy and avoids malfunctioning.
Embodiment three
The present embodiment provides a kind of looped network of DC power on-line monitoring methods, the application scenarios suitable for power monitoring field,
The efficiency of grid operating monitoring can be improved, the looped network of DC power on-line monitoring method is by a kind of looped network of DC power on-line monitoring system
It executes, passes through software and or hardware realization.
Referring to fig. 4, the looped network of DC power on-line monitoring method includes the following steps:
S301: auxiliary to the position of the electric current Ic1 in I charger circuit, the electric current Ix1 in I battery circuit and bus connection switch 505
Adjuvant grafting point Fm is monitored.
S302: when I battery circuit is in floating charge state, and the location status of the bus connection switch 505 changes, root
Situation of change according to the electric current Ix1 of the electric current Im in the mother circuit, the electric current Ic1 in I charger circuit and I battery circuit is sentenced
It is disconnected to whether there is looped network of DC power.
In the present embodiment, S302 includes:
S3021a: when the bus connection switch 505 switches to closed state by disjunction state, if the electric current Im in mother circuit
Changing value within the scope of allowable error；And/or when the bus connection switch 505 switches to disjunction state by closed state, I
The difference of the electric current Ic1 in charger circuit and the electric current Ix1 in I battery circuit are within the scope of allowable error, then the first direct current system
Looped network is not present in system and the second direct current system.
S3022a: when the bus connection switch 505 switches to closed state by disjunction state, if the electric current Im in mother circuit
Changing value exceed allowable error range；And/or when the bus connection switch 505 switches to disjunction state by closed state, I
The difference of the electric current Ic1 in charger circuit and the electric current Ix1 in I battery circuit exceed allowable error range, then the first direct current system
There are looped networks with the second direct current system for system.
Generally, it when wherein a group storage battery group or charging unit maintenance or debugging need out of service in station, needs
It is operated sequentially each switch.(I electric power storage is illustrated so that II battery group 203 and II charging unit 202 are out of service as an example below
Pond group 103 and I charging unit 102 exit similarly, repeat no more):
1. being first closed bus connection switch 505: after closure bus connection switch 505, two sets of direct current systems are switched to side by side by fanout operation
Operation.Generally, looped network of DC power if it does not exist, since the voltage of I section of bus 101 and II section of bus 201 is similar, so female at this time
The electric current for joining circuit should be about zero；Consider the factors such as practical line loss, allowable error range can be added, i.e., when mother circuit
When current variation value is within the scope of allowable error, then it can be determined that there is no looped network of DC power.If I section of bus 101 and second is directly
There are the connection points (i.e. loop-net operation) at one or more between streaming system, then since bus connection switch 505 is relative to feeder line looped network
Impedance it is very low, bus connection switch 505 by disjunction to closure when, point column when connection position circulation largely is opened by the mother closed
It closes 505 to be shunted, load current will generate mutation at this time, i.e. the electric current Im in mother circuit can be greater than allowable error range.
2. disconnecting II charging corresponding II charge switch 503 of unit 202 and II electric power storage corresponding with II battery group 203 being opened
504 are closed, I charging unit 102 and I battery group 103 simultaneously power to I section of bus 101 and II section of bus 201 at this time；
3. II battery group 203 and II charging unit 202 are overhauled or are debugged；
4. maintenance or debugging finish, it is closed II charge switch 503 and II electric power storage switch 504, two sets of direct current systems are restored simultaneously
Column operation；
5. disconnecting bus connection switch 505, the first direct current system and the second direct current system are restored to fanout operation.It is female disconnecting
Before joining switch 505, II battery group 203 and II charging unit 202 have been included in the second direct current system, I section of bus 101 and II
The voltage of section bus 201 is similar again, and after bus connection switch 505 is switched to disjunction by closure, load current should not mutate,
I.e. Δ (Ic1-Ix1) is approximately equal to zero, it is preferred that corresponding allowable error range can be set, allow when Δ (Ic1-Ix1) is in
When in error range, it is believed that looped network of DC power is not present.Looped network of DC power if it exists, when bus connection switch 505 is by being closed into disjunction,
The out-of-balance current of two sets of direct current systems is all undertaken by connection position, and load current generates mutation, i.e. Δ (Ic1-Ix1) meeting at this time
Greater than allowable error range.
To sum up, when 505 position of bus connection switch changes, can be used for judging whether there is between two systems there are two
The judgment basis of looped network, any one condition satisfaction can determine whether that there are looped networks.
Device is caused to be judged by accident to prevent in direct current system current mulual inductor malfunction to lead to not correctly to acquire, it is final to report by mistake
Looped network or the thing for refusing to submit looped network occur, and while the present embodiment combines two conditions, are further added by duration judgment basis, into
Row comprehensive descision.I.e. when only a condition meets, it is necessary to alarm can be just exported by longer third time span T3, when
When two conditions meet simultaneously, alarm is exported through the 4th shorter time span T4.Realize optimal policy.It is specific as follows:
S302 can also include:
S3021b: when the bus connection switch 505 switches to closed state by disjunction state, the electric current Im's in mother circuit
Changing value is within the scope of allowable error and continues third time span T3；Alternatively,
When the bus connection switch 505 switches to disjunction state by closed state, the electric current Ic1 in I charger circuit and I stores
The difference of the electric current Ix1 of cell circuit is within the scope of allowable error and continues third time span T3；Alternatively,
When the bus connection switch 505 switches to closed state by disjunction state, the changing value of the electric current Im in mother circuit
Within the scope of allowable error, and when the bus connection switch 505 switches to disjunction state by closed state, I charger circuit
The difference of electric current Ic1 and the electric current Ix1 in I battery circuit continue the 4th time span T4 within the scope of allowable error, then and first
Looped network is not present in direct current system and the second direct current system；Wherein, T3 > T4；
S3022b: when the bus connection switch 505 switches to closed state by disjunction state, the electric current Im's in mother circuit
Changing value is beyond allowable error range and continues third time span T3；Alternatively,
When the bus connection switch 505 switches to disjunction state by closed state, the electric current Ic1 in I charger circuit and I stores
The difference of the electric current Ix1 of cell circuit is beyond allowable error range and continues third time span T3；Alternatively,
When the bus connection switch 505 switches to closed state by disjunction state, the changing value of the electric current Im in mother circuit
Beyond allowable error range, and when the bus connection switch 505 switches to disjunction state by closed state, I charger circuit
The difference of electric current Ic1 and the electric current Ix1 in I battery circuit exceed allowable error range, continue the 4th time span T4, then and first
There are looped networks for direct current system and the second direct current system.
It should be noted that different allowable error ranges should be set in different occasions in above steps, into
One step, allowable error range is smaller, and easier to fail to report, allowable error range is bigger, easier wrong report, permitting in different step
Perhaps error range can be taking human as being adjusted.
In this present embodiment, when finding that the first direct current system and the second direct current system there are when looped network, can send warning
Information and printing monitoring report remind the maloperation of electric power personnel timely correction and eliminate looped network connection position to inform electric power personnel,
Avoid whole station DC voltage losing major accident event.
In embodiment provided herein, it should be understood that disclosed system, unit, device and method can be with
It realizes by another way.For example, all embodiments described above are only schematical, for example, said units or
The division of person's module etc., only a kind of logical function partition, there may be another division manner in actual implementation, such as multiple
Unit, module and component can be combined or can be integrated into another system, or some features can be ignored, or not hold
Row.Another point, shown or discussed mutual coupling, direct-coupling or communication connection can be through some interfaces,
The indirect coupling or communication connection of device or unit can be electrical property, mechanical or other forms.
The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple
In network unit.It can select some or all of unit therein according to the actual needs to realize the mesh of this embodiment scheme
's.
It, can also be in addition, each functional unit in each embodiment of the application can integrate in one processing unit
It is that each unit physically exists alone, can also be integrated in one unit with two or more units.Above-mentioned integrated list
Member both can take the form of hardware realization, can also realize in the form of software functional units.
If the integrated unit is realized in the form of SFU software functional unit and sells or use as independent product
When, it can store in a computer readable storage medium.Based on this understanding, the technical solution of the application is substantially
The all or part of the part that contributes to existing technology or the technical solution can be in the form of software products in other words
Embody, which is stored in a computer readable storage medium, including some instructions use so that
One terminal device (can be mobile phone, notebook or other electronic equipments etc.) executes side described in each embodiment of the application
The all or part of the steps of method.And storage medium above-mentioned includes: USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only
Memory), random access memory (RAM, Random Access Memory), magnetic or disk etc. are various can store journey
The medium of sequence code.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to the foregoing embodiments
Invention is explained in detail, those skilled in the art should understand that: it still can be to aforementioned each implementation
Technical solution documented by example is modified or equivalent replacement of some of the technical features；And these modification or
Replacement, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution.
Claims (10)
1. a kind of looped network of DC power on-line monitoring system characterized by comprising
First direct current system, first direct current system include I section of bus, I charger circuit and I battery circuit, and described I fills
Electric motor loop and I battery circuit parallel connection access in I section of bus；
Second direct current system, second direct current system includes II section of bus, II charger circuit and II battery circuit, described
II charger circuit and II battery circuit parallel connection access in II section of bus；
Mother circuit, the mother circuit connect I section of bus and II section of bus by a bus connection switch；The mother
Switch is equipped with the location assistance contact for acquiring its folding condition；
Current acquisition system, the current acquisition system are returned for detecting I charger circuit, I battery circuit and mother respectively
The electric current of road three.
2. looped network of DC power on-line monitoring system according to claim 1, which is characterized in that the current acquisition system includes
First current transformer in series connection access I charger circuit, series connection access second Current Mutual Inductance in I battery circuit
Device and series connection access the 7th current transformer in the mother circuit.
3. looped network of DC power on-line monitoring system according to claim 1, which is characterized in that II charger circuit is equipped with
II charge switch, II battery circuit are switched equipped with II electric power storage.
4. looped network of DC power on-line monitoring system according to claim 1, which is characterized in that further include processing chip and alarm
Device, the processing chip are electrically connected with the current acquisition system and warning device respectively.
5. looped network of DC power on-line monitoring system according to claim 4, which is characterized in that further include for printing monitoring report
The printing equipment of announcement, the processing chip are electrically connected with the printing equipment.
6. a kind of looped network of DC power on-line monitoring method is suitable for the described in any item looped network of DC power on-line monitorings of Claims 1 to 5
System, which is characterized in that the described method includes:
The location assistance contact Fm of the electric current Ic1 in I charger circuit, the electric current Ix1 in I battery circuit and bus connection switch are carried out
Monitoring；
When I battery circuit is in floating charge state, when the location status of the bus connection switch changes, returned according to the mother
The situation of change of the electric current Ix1 of the electric current Im on road, the electric current Ic1 in I charger circuit and I battery circuit judge whether there is directly
Flow looped network.
7. looped network of DC power on-line monitoring method according to claim 6, which is characterized in that described at I battery circuit
When the location status of floating charge state, the bus connection switch changes, according to the electric current Im in the mother circuit, I charger
The situation of change of the electric current Ic1 in circuit and the electric current Ix1 in I battery circuit judge whether there is looped network of DC power, comprising:
When the bus connection switch switches to closed state by disjunction state, if the changing value of the electric current Im in mother circuit is allowing
In error range；And/or when the bus connection switch switches to disjunction state by closed state, the electric current in I charger circuit
The difference of Ic1 and the electric current Ix1 in I battery circuit are within the scope of allowable error, then the first direct current system and the second direct current system
There is no looped networks.
8. looped network of DC power on-line monitoring method according to claim 7, which is characterized in that described at I battery circuit
When the location status of floating charge state, the bus connection switch changes, according to the electric current Im in the mother circuit, I charger
The situation of change of the electric current Ic1 in circuit and the electric current Ix1 in I battery circuit judge whether there is looped network of DC power, further includes:
When the bus connection switch switches to closed state by disjunction state, if the changing value of the electric current Im in mother circuit is beyond fair
Perhaps error range；And/or when the bus connection switch switches to disjunction state by closed state, the electric current in I charger circuit
The difference of Ic1 and the electric current Ix1 in I battery circuit exceed allowable error range, then the first direct current system and the second direct current system
There are looped networks.
9. looped network of DC power on-line monitoring method according to claim 8, which is characterized in that described at I battery circuit
When the location status of floating charge state, the bus connection switch changes, according to the electric current Im in the mother circuit, I charger
The situation of change of the electric current Ic1 in circuit and the electric current Ix1 in I battery circuit judge whether there is looped network of DC power, comprising:
When the bus connection switch switches to closed state by disjunction state, the changing value of the electric current Im in mother circuit is allowing to miss
In poor range and continue third time span T3；Alternatively,
When the bus connection switch switches to disjunction state by closed state, the electric current Ic1 and I battery in I charger circuit are returned
The difference of the electric current Ix1 on road is within the scope of allowable error and continues third time span T3；Alternatively,
When the bus connection switch switches to closed state by disjunction state, the changing value of the electric current Im in mother circuit is allowing to miss
In poor range, and when the bus connection switch switches to disjunction state by closed state, the electric current Ic1 in I charger circuit and I stores
The difference of the electric current Ix1 of cell circuit continues the 4th time span T4 within the scope of allowable error, then the first direct current system and
Looped network is not present in two direct current systems；Wherein, T3 > T4.
10. looped network of DC power on-line monitoring method according to claim 9, which is characterized in that described at I battery circuit
When the location status of floating charge state, the bus connection switch changes, according to the electric current Im in the mother circuit, I charger
The situation of change of the electric current Ic1 in circuit and the electric current Ix1 in I battery circuit judge whether there is looped network of DC power, further includes:
When the bus connection switch switches to closed state by disjunction state, the changing value of the electric current Im in mother circuit is beyond permission
Error range simultaneously continues third time span T3；Alternatively,
When the bus connection switch switches to disjunction state by closed state, the electric current Ic1 and I battery in I charger circuit are returned
The difference of the electric current Ix1 on road is beyond allowable error range and continues third time span T3；Alternatively,
When the bus connection switch switches to closed state by disjunction state, the changing value of the electric current Im in mother circuit is beyond permission
Error range, and when the bus connection switch switches to disjunction state by closed state, the electric current Ic1 in I charger circuit and I stores
The difference of the electric current Ix1 of cell circuit exceeds allowable error range, continues the 4th time span T4, then the first direct current system and the
There are looped networks for two direct current systems.
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