CN110320447A - Become DC grid topology and its Fault Locating Method through high resistance ground based on connection - Google Patents
Become DC grid topology and its Fault Locating Method through high resistance ground based on connection Download PDFInfo
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- CN110320447A CN110320447A CN201910712502.XA CN201910712502A CN110320447A CN 110320447 A CN110320447 A CN 110320447A CN 201910712502 A CN201910712502 A CN 201910712502A CN 110320447 A CN110320447 A CN 110320447A
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- high resistance
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Abstract
The present invention relates to a kind of DC grid topology and its Fault Locating Methods become based on connection through high resistance ground, the d. c. voltage signal of DC line is detected by way of detectable voltage signals first, whether preliminary judgement breaks down, after determining to break down, control is shorted out the high resistance ground route being arranged between tietransformer neutral point and ground, in this case, since the high resistance measurement being arranged between tietransformer neutral point and ground is short-circuited, fault current will be generated in DC line, and then the detection of fault location is carried out according to fault current.Therefore, which is suitable for becoming the DC grid topology through high resistance ground based on connection, can be realized fault location, and then carry out trouble hunting according to location of fault, meets the fault location demand that connection becomes the DC grid topology through high resistance ground.In addition, the Fault Locating Method is simple, practical, it is easy to engineering site implementation, improves the reliability of DC grid.
Description
Technical field
The present invention relates to a kind of DC grid topology and its Fault Locating Methods become based on connection through high resistance ground.
Background technique
It is limited with the high contradiction of load density that DC distribution net can be relieved AC network website corridor, have it is more preferable receive it is straight
Stream load, terminal user's load direct current trend it is obvious and preferably high-quality power demand, be easy to distributed energy and energy storage
High density access and the advantages that make full use of demand, therefore, DC distribution net by be power distribution network the main direction of development.
DC distribution net is in the initial development stage as a kind of new distribution technique, as shown in Figure 1, connection becomes (connection
Connect transformer) it through high resistant (the very big resistance R of resistance value) ground connection is DC distribution net typically topological mode, i.e. connection becomes neutral
Point passes through high resistance ground line-to-ground, and string is equipped with high resistance measurement R on high resistance ground route.As shown in Figure 1, becoming warp based on connection
The DC grid topology of high resistance ground includes converter station DC area and direct current with electricity consumption area, wherein converter station DC area is corresponding
The number of converter station is 3, and certainly, converter station can also be set to other numbers according to actual needs；Direct current matches electricity consumption area
The distributed power generation of middle access can be photovoltaic power generation, is also possible to hydroelectric generation either wind-power electricity generation etc., can also be
Any combination of multiple distributed power generations, it is of course also possible to without distributed power generation；Direct current has with the electricity consumption part in electricity consumption area
Energy-storage system, charging pile, DC load and AC load, certainly, the concrete form of electricity consumption are accessed according to actual needs, also
Have and be exactly, if the system is only a DC transmission system, so that it may there is no electricity consumption part.Connection shown in FIG. 1 becomes warp
When the DC distribution net topology of high resistance ground breaks down, for example with electricity consumption area monopole ground connection occurs for converter station DC area or direct current
Event when failure, due to the mode of high resistance ground, in fault loop (the related DC line to break down in direct current gauze)
It is minimum to hinder electric current, fault location can not be realized by electric current, and then trouble hunting, Wu Faman can not be carried out according to location of fault
Football Association connects the fault location demand for becoming the DC distribution net topology through high resistance ground.
Summary of the invention
The object of the present invention is to provide a kind of fault location sides for becoming the DC grid topology through high resistance ground based on connection
Method, becomes the DC grid topology through high resistance ground in the event of a failure based on connection to solve, the failure electricity in fault loop
Flow it is minimum, can not by electric current realize fault location the problem of.Present invention simultaneously provides one kind to be become based on connection through high resistance ground
DC grid topology, to solve based on connection become the DC grid topology through high resistance ground in the event of a failure, failure return
The problem of fault current in road is minimum, can not realize fault location by electric current.
To achieve the above object, the solution of the present invention includes:
A kind of Fault Locating Method becoming the DC grid topology through high resistance ground based on connection, comprising the following steps:
(1) voltage signal of DC line is detected, and judges whether to break down according to the voltage signal detected；
(2) when being broken down according to voltage signal judgement, control, which is shorted out between tietransformer neutral point and ground, to be arranged
High resistance ground route；
(3) detection of fault location is carried out according to fault current.
Due to being provided with high resistance ground route between tietransformer neutral point and ground, when breaking down, fault current pole
It is small, fault location can not be realized by electric current, then, the direct current of DC line is detected by way of detectable voltage signals first
Whether voltage signal, preliminary judgement break down, and after determining to break down, control is shorted out tietransformer neutral point and ground
Between the high resistance ground route that is arranged, in this case, due to the high resistance measurement being arranged between tietransformer neutral point and ground
It is short-circuited, fault current will be generated in DC line, and then carry out the detection of fault location according to fault current.Therefore,
The Fault Locating Method is suitable for becoming the DC grid topology through high resistance ground based on connection, can send out in the DC grid topology
Fault location is carried out when raw failure, and then trouble hunting is carried out according to location of fault, is met connection and is become through high resistance ground
The DC grid demand of DC distribution net topology.In addition, the Fault Locating Method is simple, practical, it is easy to engineering site implementation, mentions
The high reliability of DC grid.
Further, in order to promote the reliability for carrying out fault diagnosis according to voltage signal, in step (1), direct current is detected
The cathode voltage signal and cathode voltage signal of route calculate the sum of cathode voltage signal and cathode voltage signal, obtain direct current
Voltage variety determines to break down when DC voltage change amount is greater than voltage variety given threshold.
Further, in order to promote the reliability of fault location, in step (3), on each route in DC grid topology
Protective device according to fault current carry out fault location.
The DC grid topology through high resistance ground, including direct current gauze and at least are become based on connection the present invention also provides a kind of
Two converter stations, the direct current gauze include the first DC line, are connected between converter station by first DC line
It connects, tietransformer is provided at least one converter station, the neutral point of tietransformer passes through high resistance ground line-to-ground, institute
It states high resistance ground lines in parallel and is provided with a bypass branch, string is equipped with bypass cock on the bypass branch, for bypassing
The high resistance ground route is shorted out when closing the switch, it is described to further include based on DC grid topology of the connection change through high resistance ground
Fault locator, fault location strategy that the fault locator is realized the following steps are included:
(1) voltage signal of direct current gauze is detected, and judges whether to break down according to the voltage signal detected；
(2) when being broken down according to voltage signal judgement, control, which is shorted out between tietransformer neutral point and ground, to be arranged
High resistance ground route；
(3) detection of fault location is carried out according to fault current.
Due to being provided with high resistance ground route between tietransformer neutral point and ground, when breaking down, fault current pole
It is small, fault location can not be realized by electric current, then, the direct current of DC line is detected by way of detectable voltage signals first
Whether voltage signal, preliminary judgement break down, and after determining to break down, control is shorted out tietransformer neutral point and ground
Between the high resistance ground route that is arranged, in this case, due to the high resistance measurement being arranged between tietransformer neutral point and ground
It is short-circuited, fault current will be generated in DC line, and then carry out the detection of fault location according to fault current.Therefore,
Fault location can be carried out when the DC grid topology breaks down, and then trouble hunting is carried out according to location of fault, it is full
Foot connection becomes the DC grid demand of DC distribution net topology through high resistance ground.In addition, the event in DC grid topology
It is simple, practical to hinder positioning strategy, is easy to engineering site implementation, improves the reliability of DC grid.
Further, in order to promote the reliability for carrying out fault diagnosis according to voltage signal, in step (1), direct current is detected
The cathode voltage signal and cathode voltage signal of route calculate the sum of cathode voltage signal and cathode voltage signal, obtain direct current
Voltage variety determines to break down when DC voltage change amount is greater than voltage variety given threshold.
Further, the DC grid topology further includes distributed power generation part and electricity consumption part, the direct current gauze
It further include the second DC line and third DC line, the DC output end of the distributed power generation part passes through the second direct current
First DC line described in connection, the electricity consumption part connect first DC line by third DC line.
Further, in order to promote the reliability of fault location, in step (3), the guarantor on each route in direct current gauze
Protection unit carries out fault location according to fault current.
Detailed description of the invention
Fig. 1 is existing based on DC grid topology diagram of the connection change through high resistance ground；
Fig. 2 is provided by the invention based on DC grid topology diagram of the connection change through high resistance ground；
Fig. 3 is that direct current matches electricity consumption area in the DC grid topology provided by the invention based on connection change through high resistance ground
GOOSE networking schematic diagram.
Specific embodiment
Become the DC grid topology embodiment through high resistance ground based on connection:
The DC grid topology through high resistance ground, including direct current gauze and at least are become based on connection the present embodiment provides a kind of
Two converter stations, converter station is for 3 here, as shown in Fig. 2, being respectively station 1, stand 2 and station 3.In DC grid topology
It can only include converter station, not be related to other distributed power generation parts and electricity consumption part, then, which is just
A kind of DC transmission system in DC grid topology other than converter station, can also relate to other distributed hairs certainly
Electric part and electricity consumption part, then, which is just a kind of DC grid system for collecting transmission of electricity, distribution and electricity consumption.
In the present embodiment, which includes converter station, relevant distributed power generation part and electricity consumption part, then, direct current
Gauze just includes three kinds of DC lines, is the first DC line, the second DC line and third DC line respectively, converter station it
Between be attached by the first DC line, the DC output end of distributed power generation part passes through the second DC line connection the
One DC line, electricity consumption part connect the first DC line by third DC line.Distributed power generation part is with photovoltaic power generation
For, it is of course also possible to be hydroelectric generation either wind-power electricity generation etc., it can also be any group of multiple distributed power generations
It closes；In the present embodiment, electricity consumption part includes energy-storage system, charging pile, DC load and AC load.So, the DC grid
Topology can be divided into two regions on the whole, be converter station DC area and direct current respectively with electricity consumption area, the tool in the two regions
Body divides range as shown in Figure 2.
It stands 1, be provided with tietransformer in stand 2 and station 3 at least one converter station, in the present embodiment, setting in 1 of stand joins
Connect transformer.The neutral point of the tietransformer is by high resistance ground line-to-ground, as shown in Fig. 2, going here and there on high resistance ground route
Equipped with the very big resistance R of resistance value, the specific choice of resistance R resistance value requires to be routine techniques, just no longer illustrates here.And
And the high resistance ground lines in parallel is provided with a bypass branch, string is equipped with bypass cock K on the bypass branch, then, work as side
High resistance ground route can be shorted out when closing K closure by opening up, that is, be shorted out resistance R, certainly, in the normal fortune of DC grid topology
During row, bypass cock K is in an off state.
Therefore, for hardware circuit, compared with existing DC grid topology, direct current provided in this embodiment
More bypass branch in net topology.As shown in Fig. 2, IDP1 is inverter anode line current in figure, IDN1 is negative for inverter
Polar curve electric current, UDP1 are positive line voltage, and UDN1 is negative line voltage, and IDPL1, IDPL2 and IDPL3 are corresponding DC line
Positive line current, IDNL1 is negative line electric current etc..The above voltage and current signal can be used for voltage failure determine and
Current differential protection positioning.In addition, for other structures and related device in DC grid topology shown in Fig. 2, due to
It is unrelated with present invention point, and belong to routine techniques, the present embodiment is just no longer specific to be introduced.
DC grid topology further includes fault locator, which can be realized a kind of suitable for Fig. 2 institute
Show the Fault Locating Method of DC grid topology, therefore, which is substantially a kind of Fault Locating Method.The event
Barrier positioning device can be software module, be also possible to hardware control device, be realized by the software program of inside load related
Control function.
Fault Locating Method the following steps are included:
Firstly, detect direct current gauze, i.e. voltage letter on the first DC line, the second DC line and third DC line
Number, and judge whether to break down according to the voltage signal detected.A kind of specific deterministic process is given below: detection direct current
The cathode voltage signal (for positive value) and cathode voltage signal (for negative value) of route, for example the anode of DC line is detected in Fig. 2
Line voltage UDP1 and cathode line voltage UDN1 calculates the sum of cathode voltage signal and cathode voltage signal, obtains direct current buckling
Change amount, the calculation formula used here is | UDP1+UDN1 |, due to cathode voltage signal and cathode voltage signal under normal circumstances
Sum is 0, or obtained numerical value is smaller, i.e., DC voltage change amount be 0 or a smaller numerical value, that
, a voltage variety given threshold is set, sets threshold by comparing actual DC voltage change amount and voltage variety
Value to determine whether break down, specifically: when DC voltage change amount is greater than voltage variety given threshold, indicate voltage
Fluctuation is very big, determines to break down, for example, with electricity consumption area monopolar grounding fault occurs for converter station DC area or direct current；Otherwise,
Determine that there is no failures.Here, voltage variety when voltage variety given threshold can operate normally for DC line
Maximum permissible value, it is, of course, also possible to consider to reserve certain safety margin, i.e. voltage variety given threshold is slightly larger than AC line
The maximum permissible value of voltage variety when road operates normally.
Then, when determining to break down, due to high grounding, fault current is minimum at this time, can not pass through electric current
Realize positioning, then, control is shorted out the high resistance ground route being arranged between tietransformer neutral point and ground, i.e. control closure
In this case bypass cock K generates fault current, just so that failure can further be accurately positioned in route.
Finally, carrying out the detection of fault location according to fault current.
The detection technique comparative maturity of fault location is carried out according to fault current, for example Authorization Notice No. is
The event of DC transmission system disclosed in the Chinese patent document of CN102445638B, CN102508121B and CN105510773B
Hinder localization method.As a specific embodiment, the present embodiment provides a kind of tool that fault location is carried out according to fault current
Body realizes process, as described below:
Converter station DC area configures centralized protective device, and direct current configures distributed protection device with electricity consumption area, as straight
The basis of fault location is flowed, wherein the defencive function of centralized protective device includes: DC voltage unbalance protection, direct current are excessively electric
Pressure protection, inverter bus differential protecting and DC line differential protection etc.；Match according to direct current inlet wire, feeder line in direct current adapted area
Independent distributed protection device is set, defencive function includes: overcurrent protection etc., moreover, distributed protection device passes through GOOSE
Networking is communicated with adjacent protective device, as shown in figure 3, A1-A6 is distributed local protective device.
Fault verification process in Fault Locating Method can be completed by centralized protective device, centralized protective device inspection
Voltage signal is surveyed, when DC voltage change amount is greater than voltage variety given threshold, the voltage in centralized protective device is not
Balanced protection, DC over-voltage protection movement, determine to break down, moreover, the closure control of bypass cock K is also protected by centralization
Device is completed, and centralized protective device issues " closure bypass cock " signal to bypass cock K, is shorted out tietransformer neutrality
The high resistance ground route being arranged between point and ground.Then converter station DC area is realized by the differential protection of centralized protective device
DC Line Fault positioning, by distributed protection device networking mode realize direct current with electricity consumption area DC Line Fault position.
Therefore, the protective device on each route in direct current gauze carries out fault location according to fault current, with Fig. 2
Speech, such as: according to positive DC route 1 (i.e. the corresponding positive DC route of IDPL1) differential protection, positive DC line of configuration
Road 2 (i.e. the corresponding positive DC route of IDPL2) differential protection, (the i.e. corresponding positive DC line of IDPL3 of positive DC route 3
Road) differential protection, negative DC route 1 (i.e. corresponding with IDPL1 positive DC route corresponding negative DC route) be poor
Dynamic protection, negative DC route 2 (i.e. corresponding with IDPL2 positive DC route corresponding negative DC route) differential protection
And negative DC route 3 (i.e. corresponding with IDPL3 positive DC route corresponding negative DC route) differential protection
The result of the action can clearly positioning failure occur in the specific region of DC line, then realize that Fault Isolation, system restore fortune
The operation such as row.
So, after generating fault current, if failure occurs in converter station DC area, then by centralized protective device
The movement of DC line differential protection；If failure occurs to match electricity consumption area in direct current, then protected by the overcurrent in distributed protection device
Shield movement, distributed protection device are communicated by GOOSE networking with adjacent protective device, are carried out according to adjacent protection act information
Comprehensive descision.
In addition, the Fault Locating Method can be realized with built-in industrial control platform or PC device, this two kinds of devices are
The common device in direct current transportation field is equally applicable to DC distribution net field.
In above-described embodiment, according on detection obtained the first DC line, the second DC line and third DC line
Voltage signal carry out breakdown judge, certainly, if DC grid topology in be not related to distributed power generation part and electricity consumption part,
So, for just not including the second DC line and third DC line in DC grid topology, and then only being obtained according to detection
Voltage signal on one DC line carries out breakdown judge.
Specific embodiment is presented above, but the present invention is not limited to described embodiment.Base of the invention
This protection scheme is following process: becoming the DC grid topology through high resistance ground for connection, detects direct current gauze first
Voltage signal, and judge whether to break down according to the voltage signal detected, when direct current gauze breaks down, control short circuit
Fall the high resistance ground route being arranged between tietransformer neutral point and ground, fault location is finally carried out according to fault current.And
Therefore the specific implementation process for being not limited to carry out fault location according to fault current is not departing from basic protection of the invention
In the case where scheme, any realization process in the prior art for carrying out fault location according to fault current each falls within of the invention
In protection scope.
Become the Fault Locating Method embodiment of the DC grid topology through high resistance ground based on connection:
The present embodiment provides a kind of Fault Locating Methods for becoming the DC grid topology through high resistance ground based on connection, including
Following steps:
(1) voltage signal of DC line is detected, and judges whether to break down according to the voltage signal detected；
(2) when being broken down according to voltage signal judgement, control, which is shorted out between tietransformer neutral point and ground, to be arranged
High resistance ground route；
(3) detection of fault location is carried out according to fault current.
The Fault Locating Method can be separately protected, it is not limited to specific topological structure shown in Fig. 2.As long as using should
Fault Locating Method, any topological structure are fallen within the protection scope of the present invention.Due to the specific reality of the Fault Locating Method
It applies process to have given and describe in detail in above-mentioned become in the DC grid topology embodiment through high resistance ground based on connection, this reality
Example is applied just no longer to illustrate.
Claims (7)
1. it is a kind of based on connection become the DC grid topology through high resistance ground Fault Locating Method, which is characterized in that including with
Lower step:
(1) voltage signal of DC line is detected, and judges whether to break down according to the voltage signal detected；
(2) when being broken down according to voltage signal judgement, control is shorted out the height being arranged between tietransformer neutral point and ground
Hinder ground path；
(3) detection of fault location is carried out according to fault current.
2. the Fault Locating Method according to claim 1 for becoming the DC grid topology through high resistance ground based on connection,
It is characterized in that,
In step (1), the cathode voltage signal and cathode voltage signal of DC line are detected, calculates cathode voltage signal and cathode
The sum of voltage signal obtains DC voltage change amount, when DC voltage change amount is greater than voltage variety given threshold, determines
It breaks down.
3. the Fault Locating Method according to claim 1 or 2 for becoming the DC grid topology through high resistance ground based on connection,
It is characterized in that, the protective device on each route in DC grid topology carries out failure according to fault current and determines in step (3)
Position.
4. a kind of become the DC grid topology through high resistance ground, including direct current gauze and at least two converter stations, institute based on connection
Stating direct current gauze includes the first DC line, is attached between converter station by first DC line, at least one is changed
Tietransformer is provided in stream station, the neutral point of tietransformer passes through high resistance ground line-to-ground, which is characterized in that described
High resistance ground lines in parallel is provided with a bypass branch, and string is equipped with bypass cock on the bypass branch, for opening in bypass
Close and be shorted out the high resistance ground route when closing, it is described based on connection become the DC grid topology through high resistance ground further include therefore
Hinder positioning device, the fault location strategy that the fault locator is realized the following steps are included:
(1) voltage signal of direct current gauze is detected, and judges whether to break down according to the voltage signal detected；
(2) when being broken down according to voltage signal judgement, control is shorted out the height being arranged between tietransformer neutral point and ground
Hinder ground path；
(3) detection of fault location is carried out according to fault current.
5. according to claim 4 become the DC grid topology through high resistance ground based on connection, which is characterized in that step
(1) in, the cathode voltage signal and cathode voltage signal of DC line are detected, calculates cathode voltage signal and cathode voltage signal
The sum of, DC voltage change amount is obtained, when DC voltage change amount is greater than voltage variety given threshold, determines that event occurs
Barrier.
6. according to claim 4 or 5 become the DC grid topology through high resistance ground based on connection, which is characterized in that institute
Stating DC grid topology further includes distributed power generation part and electricity consumption part, the direct current gauze further include the second DC line and
The DC output end of third DC line, the distributed power generation part connects first direct current by the second DC line
Route, the electricity consumption part connect first DC line by third DC line.
7. according to claim 4 or 5 become the DC grid topology through high resistance ground based on connection, which is characterized in that step
Suddenly in (3), the protective device on each route in direct current gauze carries out fault location according to fault current.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117233532A (en) * | 2023-09-21 | 2023-12-15 | 中科智寰(北京)科技有限公司 | DC power grid ground fault on-line positioning and protecting system |
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