CN104600659B - A kind of configuration method of the 380V power distribution network fuses protection of access distributed generation resource - Google Patents
A kind of configuration method of the 380V power distribution network fuses protection of access distributed generation resource Download PDFInfo
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- CN104600659B CN104600659B CN201410842615.9A CN201410842615A CN104600659B CN 104600659 B CN104600659 B CN 104600659B CN 201410842615 A CN201410842615 A CN 201410842615A CN 104600659 B CN104600659 B CN 104600659B
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Abstract
The present invention relates to a kind of configuration methods of the 380V power distribution network fuses protection of access distributed generation resource, and the method includes building the network topology model of 380V low-voltage networks；Obtain the maximum load current that the access way of distributed generation resource and distributed generation resource are provided in the network topology model；According to the rated current of distributed electrical Source Type and the distributed generation resource, the fault current of distributed generation resource is determined；Limit the rated capacity range of fuse protection；Set the rated capacity of the fuse protection and its superior and the subordinate's fuse protection；The sensitivity for substantially increasing fuse protection enhances the reliability of fuse protection.
Description
Technical field
The present invention relates to a kind of configuration methods, and in particular to a kind of 380V low-voltage networks fusing of access distributed generation resource
The configuration method of device protection.
Background technology
Access 380V low-voltage networks are the important forms of distributed generation resource access, and specific access way is directly accessed
It is accessed with T.The access of distributed generation resource changes the network topology structure of traditional 380V low-voltage networks, not only makes 380V low
Press-fitting power grid becomes a multiterminal electric power network, and the access of distributed generation resource introduces largely in 380V low-voltage networks
Power supply control strategy, these control strategies can influence the operation characteristic and fault characteristic of low-voltage network.Different types of distribution
Formula power supply has the fault characteristic of its own, and the control characteristic and fault characteristic of these distributed generation resources itself are all to a certain extent
The fault characteristic of legacy network is changed, and then influences the distribution of the fault current in 380V low-voltage networks, it is low to influence
The fuse protection being press-fitted in power grid.The configuration method of fuse protection in conventional low power distribution network is mainly according to single-ended electricity
System failure characteristic under source, considers the operating chacteristics of fuse, is configured step by step.The specified electricity of Main Basiss higher level's fuse-link
For stream not less than 1.6 times of subordinate's fuse value, being treated as the superior and the subordinate can selective disengagement failure electric current.But with distribution
After plant-grid connection 380V low-voltage networks, the change of system failure characteristic makes original configuration mode no longer be applicable in, and needs to make
Fuse protection is configured with new method.
Invention content
In view of the deficiencies of the prior art, the present invention provides a kind of 380V power distribution network fuses protection of access distributed generation resource
Configuration method, for do not access the fault characteristic of distributed generation resource low-voltage distribution, the part throttle characteristics of low-voltage network, access point
The composite factors such as the type of cloth power supply and the fault characteristic of distributed generation resource carry out comprehensive analysis and reasonable disposition, realize
Strong protection to fuse, the selection for fuse rated current provide foundation.
The purpose of the present invention is what is realized using following technical proposals：
A kind of configuration method of the 380V power distribution network fuses protection of access distributed generation resource, the method includes：
(1) network topology model of 380V low-voltage networks is built；
(2) maximum that the access way of distributed generation resource and distributed generation resource are provided in the network topology model is obtained
Load current；
(3) according to the rated current of distributed electrical Source Type and the distributed generation resource, the failure electricity of distributed generation resource is determined
Stream；
(4) the rated capacity range of fuse protection is limited；
(5) rated capacity of the fuse protection and its superior and the subordinate's fuse protection is set.
Preferably, in the step (2), the access way of the distributed generation resource includes：It is directly accessed and is accessed with T.
Further, in the step (3), the distributed electrical Source Type includes：Inverter type distributed generation resource and rotation
Rotating motor type distributed generation resource.
Further, the short circuit current that the distributed generation resource of the inverter type provides is no more than its rated current
1.5 again；
The short circuit current that the distributed generation resource of the electric rotating type provides is no more than 8 times of its rated current.
Preferably, in the step (4), the rated capacity of the fuse protection is less than the failure of the distributed generation resource
Electric current, and it is out of service more than the distributed generation resource when flow through the maximum load current of fuse.
Preferably, it in the step (5), protects the sequencing of excision failure to set the fuse according to fuse and protects
The rated capacity of shield and its superior and the subordinate's fuse protection, the rated capacity that first fuse of excision failure is protected cut off event after being less than
The rated capacity of the fuse protection of barrier.
Preferably, the rated capacity of the fuse protection is less than the fault current of the distributed generation resource, and is more than institute
State distributed generation resource it is out of service when flow through the maximum load current of fuse.
Preferably, protect the sequencing setting fuse protection of excision failure and its superior and the subordinate molten according to fuse
The rated capacity of disconnected device protection, the fuse protection of excision failure after first the rated capacity of the fuse protection of excision failure is less than
Rated capacity.
Compared with the prior art, the advantageous effect that the present invention reaches is：
1. can consider system failure characteristic, distributed generation resource fault characteristic, fault point specific location select
Configure the amount of capacity of fuse so that the configuration of fuse and type selecting are more reasonable, not only substantially increase fuse guarantor
The sensitivity of shield, and enhance the reliability of fuse protection.
2. proposing specific configuration strategy, the configuration for fuse in access distributed generation resource low-voltage network provides tool
The feasible method of body improves the safety that fuse is applied in accessing distributed generation resource low-voltage network.
Description of the drawings
Fig. 1 is the configuration method flow chart of the 380V power distribution network fuses protection of access distributed generation resource provided by the invention
Fig. 2 is distributed generation resource provided by the invention through access via telephone line 380V power distribution network typical wiring schematic diagrames
Fig. 3 is distributed generation resource T accesses 380V power distribution network typical wiring schematic diagrames provided by the invention
Specific implementation mode
The specific implementation mode of the present invention is described in further detail below in conjunction with the accompanying drawings.
A kind of configuration method of the 380V power distribution network fuses protection of access distributed generation resource, the method includes：
(1) network topology model of 380V low-voltage networks is built；
(2) maximum that the access way of distributed generation resource and distributed generation resource are provided in the network topology model is obtained
Load current；It is calculated according to the rated power of distributed generation resource.In the step (2), the access way of the distributed generation resource
Including：It is directly accessed and is accessed with T.
(3) according to the rated current of distributed electrical Source Type and the distributed generation resource, the failure electricity of distributed generation resource is determined
Stream；In the step (3), the distributed electrical Source Type includes：Inverter type distributed generation resource and electric rotating type are distributed
Power supply.The short circuit current that the distributed generation resource of the inverter type provides is no more than 1.5 times of its rated current；The rotation
The short circuit current that the distributed generation resource of rotating motor type provides is no more than 8 times of its rated current.
(4) the rated capacity range of fuse protection is limited；In the step (4), the specified appearance of the fuse protection
Amount is less than the fault current of the distributed generation resource, and flows through the maximum of fuse when out of service more than the distributed generation resource
Load current.
(5) rated capacity of the fuse protection and its superior and the subordinate's fuse protection is set；In the step (5), root
The specified appearance that the sequencing of excision failure sets the fuse protection and its superior and the subordinate's fuse is protected is protected according to fuse
Amount, the rated capacity of the fuse protection of excision failure after first the rated capacity of the fuse protection of excision failure is less than.
As shown in Fig. 2, for power supply is through access via telephone line 380V power distribution network typical wirings in a distributed manner, that is accessed in system divides
Cloth power supply is the distributed generation resource of inverter type, and the load 1 of system, 2 size of load are 200kVA, and load 3 is 300kVA.
To carrying out the configuration of fuse at 1DL, 2DL, 3DL, 4DL, the configuration step to 1DL is：
Step 1. determines the network topological diagram of 380V low-voltage networks according to the wiring diagram of system；
Step 2. distributed generation resource is inverter type power supply, and rated capacity 400kVA, the mode of connection connects for special line
Enter；
Step 3. in power supply external fault, inverter in the steady-state shortcircuit current that provides be 1.5 times of source nominal
Electric current is 866A；
Step 4. determines the rated load that fuse flows through under the operating mode of normal operation；Wherein, 1DL, 2DL are
100kVA, 4DL 300kVA, 3DL 400kVA, rated current 1DL, 2DL are 144A, 4DL 433A, 3DL 577A.
When distributed generation resource is out of service, 1DL, 2DL, 4DL flow through the load current of 433A when all loads are provided by system,
And the electric current of 3DL is 0A.
Step 5. is under the network topology of Fig. 2, when the 380V busbares of system side break down, the event in 1DL, 2DL, 3DL
Hinder electric current to be provided by the distributed generation resource of inverter type, and equal, be up to 866A, and excision failure should be acted by 1DL,
So the configuration strategy of tri- fuse rated current of 1DL, 2DL, 3DL is：
433A < I1DL< I2DL< I3DL< 866A
After load 3 breaks down, the fault current of 1DL, 2DL, 4DL are influenced by 380V low-voltage networks, therefore
It is generally large to hinder electric current, can be estimated according to the equiva lent impedance of system, and the fault current in 3DL is up to 866A, and flow through
Fault current in 4DL is maximum, unanimously when considering the anti-time limit characteristic of four place configuration fuses, then the action of 4DL
Time meets selectivity naturally, and the load that 4DL is most end level-one, can select the rated current less than 1DL.
Step 6. considers the content of step 4 and step 5, and the configuration method of 1DL, 2DL, 3DL, 4DL entirety is：
433A < I4DL< I1DL< I2DL< I3DL< 866A
As shown in figure 3, for power supply accesses 380V power distribution network typical wirings through T in a distributed manner, that is accessed in system divides
Cloth power supply is the distributed generation resource of inverter type, and 1 size of load of system is 200kVA, and load 2 is 300kVA.
To carrying out the configuration of fuse at 1DL, 2DL, 3DL, configuration step is：
Step 1. determines the network topological diagram of 380V low-voltage networks according to the wiring diagram of system；
Step 2. distributed generation resource is inverter type power supply, and rated capacity 400kVA, the mode of connection is that T connects
Enter；
Step 3. in power supply external fault, inverter in the steady-state shortcircuit current that provides be 1.5 times of source nominal
Electric current is 866A；
Step 4. puts into operation in distributed generation resource, and when operating under declared working condition, determines that fuse flows through specified
Load, 1DL, 2DL are 100kVA, and 3DL 400kVA, rated current 1DL, 2DL is 144A, 3DL 577A.It is being distributed
When formula power supply is out of service, 1DL, 2DL flow through the load current of 433A when all loads are provided by system, and the electricity of 3DL
Stream is 0A.
Step 5. is under the network topology of Fig. 3, when the 380V busbares of system side break down, the event in 1DL, 2DL, 3DL
Hinder electric current to be provided by the distributed generation resource of inverter type, and equal, be up to 866A, and excision failure should be acted by 1DL,
So the configuration strategy of tri- fuse rated current of 1DL, 2DL, 3DL is：
433A < I1DL< I2DL< I3DL< 866A
After load 2 breaks down, the fault current of 1DL, 2DL are influenced by 380V low-voltage networks, failure electricity
It flows generally large, can be estimated according to the equiva lent impedance of system, and the fault current in 3DL is up to 866A, is considering three
When the anti-time limit characteristic of place configuration fuse unanimously, then the actuation time of 3DL meets selectivity naturally, and 4DL is most end
The load of level-one can select the rated current less than 1DL.
Step 6. considers the content of step 4 and step 5, and the configuration method of 1DL, 2DL, 3DL, 4DL entirety is：
433A < I4DL< I1DL< I2DL< I3DL< 866A
Finally it should be noted that：The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, to the greatest extent
Invention is explained in detail with reference to above-described embodiment for pipe, those of ordinary skills in the art should understand that：Still
The specific implementation mode of the present invention can be modified or replaced equivalently, and without departing from any of spirit and scope of the invention
Modification or equivalent replacement, are intended to be within the scope of the claims of the invention.
Claims (3)
1. a kind of configuration method of the 380V power distribution network fuses protection of access distributed generation resource, which is characterized in that the method
Including：
(1) network topology model of 380V low-voltage networks is built；
(2) peak load that the access way of distributed generation resource and distributed generation resource are provided in the network topology model is obtained
Electric current；
In the step (2), the access way of the distributed generation resource includes：It is directly accessed and is accessed with T；
(3) according to the rated current of distributed electrical Source Type and the distributed generation resource, the fault current of distributed generation resource is determined；
In the step (3), the distributed electrical Source Type includes：Inverter type distributed generation resource and electric rotating type are distributed
Power supply；
(4) the rated capacity range of fuse protection is limited；
(5) rated capacity of the fuse protection and its superior and the subordinate's fuse protection is set；
The short circuit current that the distributed generation resource of the inverter type provides is no more than 1.5 times of its rated current；
The short circuit current that the distributed generation resource of the electric rotating type provides is no more than 8 times of its rated current；
In the step (4), the rated capacity of the fuse protection is less than the fault current of the distributed generation resource, and is more than
The distributed generation resource flows through the maximum load current of fuse when out of service.
2. the configuration method of the 380V low-voltage network fuses protection of access distributed generation resource as described in claim 1,
It is characterized in that, in the step (5), protects the sequencing of excision failure to set the fuse protection and its according to fuse
The rated capacity of the superior and the subordinate's fuse protection, excision failure is molten after first the rated capacity of the fuse protection of excision failure is less than
The rated capacity of disconnected device protection.
3. the configuration method of the 380V low-voltage network fuses protection of access distributed generation resource as described in claim 1,
It is characterized in that, the rated capacity of the fuse protection is less than the fault current of the distributed generation resource, and is more than the distribution
Formula power supply flows through the maximum load current of fuse when out of service.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN88201247U (en) * | 1988-02-08 | 1988-10-19 | 内蒙古赤蜂红山机电研究所 | Current leakage protector with overcurrent and short-circuit protecting function |
| CN101562333A (en) * | 2009-05-27 | 2009-10-21 | 天津大学 | Fast current protection method for distribution network containing distributed power |
| CN103872665A (en) * | 2014-03-26 | 2014-06-18 | 国家电网公司 | Power distribution network integrated protection method suitable for access of distributed power supplies |
| CN203827062U (en) * | 2014-03-13 | 2014-09-10 | 中国能源建设集团广东省电力设计研究院 | Smart microgrid power source main wiring structure |
| US9287714B2 (en) * | 2011-11-30 | 2016-03-15 | Michael Ropp | Method and system for island detection and anti-islanding protection in distributed power generation systems |
-
2014
- 2014-12-30 CN CN201410842615.9A patent/CN104600659B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN88201247U (en) * | 1988-02-08 | 1988-10-19 | 内蒙古赤蜂红山机电研究所 | Current leakage protector with overcurrent and short-circuit protecting function |
| CN101562333A (en) * | 2009-05-27 | 2009-10-21 | 天津大学 | Fast current protection method for distribution network containing distributed power |
| US9287714B2 (en) * | 2011-11-30 | 2016-03-15 | Michael Ropp | Method and system for island detection and anti-islanding protection in distributed power generation systems |
| CN203827062U (en) * | 2014-03-13 | 2014-09-10 | 中国能源建设集团广东省电力设计研究院 | Smart microgrid power source main wiring structure |
| CN103872665A (en) * | 2014-03-26 | 2014-06-18 | 国家电网公司 | Power distribution network integrated protection method suitable for access of distributed power supplies |
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