CN105870893A - Protection configuration method for micro-grid group - Google Patents
Protection configuration method for micro-grid group Download PDFInfo
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- CN105870893A CN105870893A CN201610201345.2A CN201610201345A CN105870893A CN 105870893 A CN105870893 A CN 105870893A CN 201610201345 A CN201610201345 A CN 201610201345A CN 105870893 A CN105870893 A CN 105870893A
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- switch
- capacitance sensor
- microgrid
- bus
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/28—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for meshed systems
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
- H02H7/226—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices for wires or cables, e.g. heating wires
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Protection Of Static Devices (AREA)
Abstract
The invention relates to a protection configuration method for a micro-grid group. The method comprises the steps as follows: a grid-connection switch of each distributed power supply is provided with a first overcurrent protection device and a first direction element; each overcurrent protection device is used for starting two-stage overcurrent protection when a failure appears in a branch in which each distributed power supply is located; and each first direction element is used for enabling the current of which the current direction points to the corresponding distributed power supply to flow. By the protection configuration method provided by the invention, the grid-connection switch of each distributed power supply is provided with one first overcurrent protection device and one first direction element; the distributed power supply with an obvious current direction change during failure can cut off a failure current through the corresponding first direction element; and the distributed power supply of which the current direction change is not obvious, but the failure current is obviously increased during failure can cut off the failure current through the corresponding first overcurrent protection device, so that normal working of the micro-grid group is achieved.
Description
Technical field
The present invention relates to electrical network configuring technical field, the protection especially relating to a kind of microgrid group is joined
Put method.
Background technology
Micro-capacitance sensor, as the important component part of intelligent grid, has had extensive application,
With micro-capacitance sensor form, distributed power source is formed a two-way schedulable unit be linked in electrical network,
It it is the most effective mode playing distributed electrical source efficiency.Microgrid group refers to by geographical position close
Multiple micro-capacitance sensor middle pressure or low-voltage network interconnect that formed, there is specific function and run mesh
, between this group and power distribution network, there is common node (claiming group's PCC node), group in target group
Member in falling not only has complete micro-capacitance sensor feature and function but also have acceptance and perform group's level
Scheduling and coordination control command complete colony and are operated together the function of target.
Along with wind-power electricity generation, photovoltaic generation distributed power supply are in the access of distribution network system,
Original passive network becomes active electric network, and the trend distribution of system is become bidirectional flow from unidirectional
Logical, fault likely can cause the problems such as false protection, selectivity disorder when occurring.
Summary of the invention
To this, the present invention provides a kind of relaying configuration method of microgrid group, and the method can be to dividing
Disengagement failure electric current during cloth power failure, it is ensured that the normal work of microgrid group.
In the relaying configuration method of the microgrid group that the present invention provides, described microgrid group includes microgrid group
Bus, multiple microgrid interconnection and multiple micro-capacitance sensor, each micro-capacitance sensor is switched by primary nodal point
Connecting one to one with each microgrid interconnection, each microgrid interconnection is by microgrid interconnection
Level switch is connected with described microgrid group's bus, described microgrid group's bus by secondary nodal point switch and
Higher level's power distribution network connects；Each micro-capacitance sensor includes micro-capacitance sensor bus, distributed power source, energy storage list
Unit, load cell and controller, described distributed power source, described energy-storage units and described load
Unit is all connected with described micro-capacitance sensor bus by grid-connected switch；Described collocation method includes:
First overcurrent protective device and first is set at the grid-connected switch of described distributed power source
Directional element, described overcurrent protective device is for there is event at described distributed power source place branch road
Opening two-period form overcurrent protection during barrier, it is sensing that described first direction element is used for making the sense of current
The electric current of described distributed power source flows through.
Optionally, described collocation method also includes:
Second overcurrent protective device is set at the grid-connected switch of described load cell, described second
Overcurrent protective device for opening two-period form when described load cell place branch road breaks down
Overcurrent protection.
Optionally, described collocation method also includes:
The 3rd overcurrent protective device and second direction unit is configured at each primary nodal point switch
Part, described 3rd overcurrent protective device occurs for the microgrid interconnection connected at this primary nodal point
Fail-open syllogic overcurrent protection, it is finger that described second direction element is used for making the sense of current
Electric current to described higher level's power distribution network flows through.
Optionally, described collocation method also includes:
The 4th overcurrent protective device and third party is configured at each microgrid interconnection higher level's switch
To element, described 4th overcurrent protective device is for switching correspondence this microgrid interconnection higher level
Opening syllogic overcurrent protection when micro-capacitance sensor bus breaks down, described third direction element is used for
Making the sense of current is to point to this microgrid interconnection higher level to switch primary nodal point switch in the branch road of place
Electric current flow through.
Optionally, described collocation method also includes:
Configuring differential protection on described microgrid group's bus, described differential protection is used for
Bus differential protecting is opened when described microgrid group's bus breaks down.
Optionally, described collocation method also includes:
Module, described isolated island protection module is protected to be used at described secondary nodal point switchgear distribution isolated island
When described higher level's power distribution network breaks down, described secondary nodal point is switched tripping, carry out isolated island guarantor
Protect.
Optionally, described collocation method also includes:
Isolated island protection module, described isolated island protection mould is configured in the inverter of described energy-storage units
Block for opening isolated island protection when described load cell place branch road breaks down.
The relaying configuration method that the present invention provides, arranges the at the grid-connected switch of distributed power source
One overcurrent protective device and first direction element, significantly divide for sense of current change during fault
Fault current can be cut off by cloth power supply by first direction element, for electric current during fault
The distributed power source that the direction inconspicuous but fault current size of change substantially increases can be by first
Fault current is cut off by overcurrent protective device, to realize the normal work of microgrid group.
Accompanying drawing explanation
By inventive feature information and advantage, accompanying drawing can be more clearly understood from reference to accompanying drawing
It is schematic and should not be construed as the present invention is carried out any restriction, in the accompanying drawings:
Fig. 1 shows a kind of structural representation of microgrid group；
Fig. 2 shows the fault schematic diagram of microgrid group in Fig. 1.
Detailed description of the invention
In order to be more clearly understood that the above-mentioned purpose of the present invention, feature and advantage, knot below
Close the drawings and specific embodiments the present invention is further described in detail.Need explanation
It is that, in the case of not conflicting, the feature in embodiments herein and embodiment can be mutual
Combination.
Elaborate a lot of detail in the following description so that fully understanding the present invention, but
It is that the present invention can implement to use other to be different from other modes described here, therefore,
Protection scope of the present invention is not limited by following public specific embodiment.
Microgrid group refers to by the close multiple micro-capacitance sensor in geographical position at middle pressure or low-voltage network
That interconnection is formed, there is specific function and the group of operational objective, as it is shown in figure 1, microgrid
Group includes microgrid group's bus, multiple microgrid interconnection and multiple micro-capacitance sensor, and each micro-capacitance sensor leads to
Cross primary nodal point switch (PCC1, PCC2 ..., PCCn) and each microgrid interconnection one
One corresponding connects, each microgrid interconnection by microgrid interconnection higher level switch (K1,
K2 ..., Kn) it is connected with microgrid group's bus, described microgrid group's bus passes through secondary nodal point
Switch PCC is connected with higher level's power distribution network；Each micro-capacitance sensor includes micro-capacitance sensor bus, distributed
Power supply, energy-storage units, load cell and controller, described distributed power source, described energy storage
Unit and described load cell are all connected with described micro-capacitance sensor bus by grid-connected switch, wherein,
The grid-connected switch Kdg of distributed power source represents, the grid-connected switch Kload of load cell
Represent, distributed power source i.e. photovoltaic, motor distributed power supply.The controller of micro-capacitance sensor is used
Distributed power source, energy storage, load and PCCn switch etc. one in receiving and process micro-capacitance sensor
The service data of secondary device, simultaneously according to micro-capacitance sensor PCCn on off state, load condition,
Distributed power source state and micro-capacitance sensor running status issue control instruction to each primary equipment.
For above microgrid group, the present invention provides a kind of relaying configuration method, and the method includes:
First overcurrent protective device and first is set at the grid-connected switch of described distributed power source
Directional element, described overcurrent protective device is for there is event at described distributed power source place branch road
Opening two-period form overcurrent protection during barrier, it is sensing that described first direction element is used for making the sense of current
The electric current of described distributed power source flows through.
In actual applications, overcurrent protective device can use relay.
Distributed power source can be divided into single phase power supply and two-phase power according to the sense of current two
Plant power supply, wherein:
The distributed power source of single phase power supply mainly includes sending out volt generating, wind-power electricity generation and diesel engine
Generatings etc., during its normal power supply, the sense of current points to micro-capacitance sensor bus, and during fault, fault is electric
Stream is injected, at micro-capacitance sensor bus bar side switch by this branch road distributed power source and other power supplys respectively
Electric current is changed to point to Generation Side by pointing to bus, and sense of current change is substantially.
The distributed power source that two-phase is powered mainly includes thermoelectric cold connection, battery etc., and it normally supplies
Generation Side is pointed to when pointing to microgrid bus during the sense of current during electricity, and fault electricity during fault
Stream is injected by this branch road distributed power source and other power supplys respectively, and at bus bar side switch, electric current refers to
To Generation Side, sense of current change is inconspicuous, but fault current can be brighter than normal current has
Increase aobviously.
The relaying configuration method that the present invention provides, arranges the at the grid-connected switch of distributed power source
One overcurrent protective device and first direction element, significantly divide for sense of current change during fault
Fault current can be cut off by cloth power supply by first direction element, for electric current during fault
The distributed power source that the direction inconspicuous but fault current size of change substantially increases can be by first
Fault current is cut off by overcurrent protective device, to realize the normal work of microgrid group.
In the specific implementation, the collocation method that the present invention provides can also include:
Second overcurrent protective device is set at the grid-connected switch of described load cell, described second
Overcurrent protective device for opening two-period form when described load cell place branch road breaks down
Overcurrent protection.
Wherein, load cell, such as single phase power supply generating equipment.
Load side, load cell place are pointed in the normal current direction of load cell place branch road
When branch road breaks down, fault current is still injected by power supply, electricity at micro-capacitance sensor bus bar side switch
Stream still points to load cell, but electric current significantly increases.Therefore, here in load cell
Grid-connected switch at the second overcurrent protective device is set, for during fault the sense of current change not
The load cell that obvious but fault current size substantially increases can pass through the second overcurrent protective device
Fault current is cut off, to realize the normal work of microgrid group.
In the specific implementation, the collocation method that the present invention provides also includes:
The 3rd overcurrent protective device and second direction unit is configured at each primary nodal point switch
Part, described 3rd overcurrent protective device occurs for the microgrid interconnection connected at this primary nodal point
Fail-open syllogic overcurrent protection, it is finger that described second direction element is used for making the sense of current
Electric current to described higher level's power distribution network flows through.
When microgrid interconnection is properly functioning, refer to when pointing to higher level's power distribution network during the sense of current
To subordinate's micro-capacitance sensor, but higher level's power distribution network switch i.e. secondary nodal point switch is opened with subordinate micro-capacitance sensor
At pass i.e. primary nodal point switch, the sense of current is consistent.When fault occurs, electric current is respectively by higher level
Power distribution network and subordinate's micro-capacitance sensor inject, electric current side at secondary nodal point switch and primary nodal point switch
To on the contrary, therefore on primary nodal point switch, the syllogic in higher level's power distribution network direction is pointed in configuration
Overcurrent protection, to realize the normal work of microgrid group.
In the specific implementation, the collocation method that the present invention provides also includes:
The 4th overcurrent protective device and third party is configured at each microgrid interconnection higher level's switch
To element, described 4th overcurrent protective device is for switching correspondence this microgrid interconnection higher level
Opening syllogic overcurrent protection when micro-capacitance sensor bus breaks down, described third direction element is used for
Making the sense of current is to point to this microgrid interconnection higher level to switch primary nodal point switch in the branch road of place
Electric current flow through.
When micro-capacitance sensor bus breaks down, first have to all branch roads on tripping fault bus,
The most promptly fault bus is disconnected with higher level's power distribution network, in order to avoid fault coverage expands, because of
This microgrid interconnection higher level's switchgear distribution points to the syllogic of micro-capacitance sensor generatrix direction and crosses stream guarantor
Protect, to solve the matching problem of microgrid interconnection higher level switch and each branch road.
In the specific implementation, the collocation method that the present invention provides can also include:
Configuring differential protection on described microgrid group's bus, described differential protection is used for
Bus differential protecting is opened when described microgrid group's bus breaks down.
When microgrid group's bus-bar fault, need all branch roads on tripping microgrid group's bus, but its
Subordinate's micro-capacitance sensor also can be properly functioning, so needing before distributed power source main body protection action
Promptly off-the-line, in order to avoid fault coverage expands, therefore configures bus differential protecting at this.
In the specific implementation, the collocation method that the present invention provides also includes:
Module, described isolated island protection module is protected to be used at described secondary nodal point switchgear distribution isolated island
When described higher level's power distribution network breaks down, described secondary nodal point is switched tripping, carry out isolated island guarantor
Protect.
Wherein, isolated island protection module, as long as have the element of isolated island defencive function or device is equal
Can, this present invention is not limited.
When breaking down outside microgrid group, protect timely tripping secondary nodal point by opening isolated island
Switch, by distribution side Fault Isolation so that it is subordinate's micro-capacitance sensor is properly functioning.
In the specific implementation, the collocation method that the present invention provides also includes:
Isolated island protection module, described isolated island protection mould is configured in the inverter of described energy-storage units
Block for opening isolated island protection when described load cell place branch road breaks down.
Wherein, isolated island protection module, as long as have the element of isolated island defencive function or device is equal
Can, this present invention is not limited.
When energy-storage units place branch road breaks down, the charge-discharge electric power of energy-storage units increases rapidly
Greatly, at this moment starting isolated island protection can be by Fault Isolation.
In the specific implementation, photovoltaic, blower fan distributed power supply, energy-storage units etc. are by inverse
Become device and access micro-capacitance sensor, owing to inverter autoprotection function includes hardware protection, DC side
Soft protection and the soft protection of AC, when therefore breaking down, directly controlled by inverter protection
Inverter is out of service can realize Fault Isolation.
It will be appreciated that any of the above allocation plan that the present invention provides is not in the case of conflicting
Can in any combination, the technical scheme after combination is still within protection scope of the present invention.
Introduce in specific works scene below the present invention provide above-mentioned collocation method:
(1) the place branch trouble of distribution power
Step one: when power branch breaks down at F2, now Kdg switch flows through event
Barrier electric current, direction sensing branch road power supply, open overcurrent protection action, tripping Kdg switchs,
Excision trouble power branch road；Inverter at power outlet is opened protection act and is made distributed electrical
Stop transport in source.If K1 does not opens protection act, then Kdg carries out reclosing, if
Reclosing success, then inverter startup distributed power source is properly functioning, if unsuccessful reclosing,
Excision trouble power branch road runs.
Step 2: K1 switch flows through fault current, and the of this branch road micro-capacitance sensor is pointed in direction
One Node Switch PCC1, if K1 opens overcurrent protection action, then tripping switch；Energy storage
Unit charge-discharge electric power quickly increases, and starts isolated island protection, the controller detection of micro-capacitance sensor 1
The primary nodal point switch PCC1 disconnected to isolated island protection, micro-capacitance sensor 1 islet operation.
Step 3: if switch Kdg, K1 reclosing success, the controller control of micro-capacitance sensor 1
The primary nodal point switch PCC1 switch time delay of micro-capacitance sensor processed is grid-connected, and this time delay is by micro-capacitance sensor 1
Controller tuning, avoid K1 reclosing movement time.If switch Kdg, K1 overlap
Lock failure, then micro-capacitance sensor 1 islet operation.
(2) the place branch trouble of load cell
Step one: when being load branch circuit fault at F3, Kload switch flows through fault current,
Opening overcurrent protection action, tripping Kload switchs, and excises fault load branch circuit.If K1
Switch protection is not operating, then Kdg carries out reclosing, if reclosing success, on-load is just
Often run, if unsuccessful reclosing, excise load operation.
Step 2, step 3 and the step 2 in (1), step 3 are identical.
(3) micro-capacitance sensor bus-bar fault
Step one: when being micro-capacitance sensor bus-bar fault at F4, K1 switch flows through fault current,
And direction point to this branch road PCC1 switch, overcurrent protection action, tripping K1 switch, excision
Micro-capacitance sensor side fault current；Owing to trouble point is inside micro-capacitance sensor, distributed power source, energy storage
Exit inverter protection act excision distributed power source and energy storage, it is to avoid continue to trouble point
Output fault current.
Step 2: if switch K1 reclosing success, distribution in inverter startup micro-capacitance sensor 1
Formula power supply, energy storage are properly functioning, if unsuccessful reclosing, excision micro-capacitance sensor 1 runs.
(4) micro-capacitance sensor fault of interconnected transmission line
Step one: when being micro-capacitance sensor fault of interconnected transmission line at F5, K1 switch flows through fault current,
And direction point to this branch road micro-capacitance sensor PCC1 switch, overcurrent protection action, tripping K1 switch,
Excision system side failure electric current；PCC1 switch flows through fault current, and higher level is pointed in direction
Electrical network, overcurrent protection action, rapid tripping PCC1.Energy-storage units charge-discharge electric power quickly increases
Greatly, starting isolated island protection, micro-capacitance sensor 1 controller detects that isolated island protection controls micro-capacitance sensor 1
Proceed to isolated power grid.
Step 2: if switch K1 reclosing success, the controller of micro-capacitance sensor 1 controls micro-electricity
The PCC1 switch time delay of net is grid-connected, and this time delay, by the controller tuning of micro-capacitance sensor 1, is avoided
K1 reclosing movement time.If switch K1 unsuccessful reclosing, then micro-capacitance sensor 1 isolated island fortune
OK.
(5) microgrid group bus-bar fault
Step one: when being microgrid group's bus-bar fault at F1, starts bus differential protecting action,
All branch switch on tripping microgrid group's bus, including PCC switch, K1 ... Kn switchs,
Micro-capacitance sensor 1 ... the energy-storage units charge-discharge electric power of micro-capacitance sensor n quickly increases, starts isolated island and protects
Protect, micro-capacitance sensor 1 ... the controller of micro-capacitance sensor n detects that isolated island protection controls each micro-capacitance sensor and proceeds to
Islet operation.
Step 2: if switch PCC, K1 ... the success of Kn reclosing, micro-capacitance sensor 1 ... micro-electricity
Net n controller control micro-capacitance sensor PCC1 ... PCCn switch time delay grid-connected, this time delay by
The controller tuning of micro-capacitance sensor, avoids PCC, K1 ... Kn reclosing movement time.If
Switch PCC, K1 ... Kn unsuccessful reclosing, then micro-capacitance sensor 1 ... micro-capacitance sensor n islet operation.
(6) microgrid group external fault
Step one: when being microgrid group's external fault at F6, microgrid group PCC switch isolated island protection
Action, tripping PCC switchs, and eliminates microgrid group to produce at short trouble and reversely helps increasing electricity
Stream.PCC1 ... PCCn switch flows through fault current, and higher level's electrical network is pointed in direction, crosses stream
Protection act, tripping PCC1 ... PCCn.Micro-capacitance sensor 1 ... the energy-storage units of micro-capacitance sensor n fills
Discharge power quickly increases, and starts isolated island protection, micro-capacitance sensor 1 ... the controller inspection of micro-capacitance sensor n
Measure the isolated island protection each micro-capacitance sensor of control and proceed to islet operation.
Step 2: if switch PCC reclosing success, micro-capacitance sensor 1 ... the control of micro-capacitance sensor n
Device processed controls the PCC1 of micro-capacitance sensor ... PCCn switch time delay is grid-connected, and this time delay is by micro-capacitance sensor
Controller tuning, avoids PCC reclosing movement time.If switch PCC reclosing loses
Lose, then micro-capacitance sensor 1 ... micro-capacitance sensor n islet operation.
By above-mentioned analysis, under this scene, the present invention uses the overcurrent protection principle of maturation,
Point to according to electric current when fault and non-faulting, incoming direction element, by with micro-capacitance sensor
The rapid communication of controller, adjusts guard time setting valve, occurs at higher level's distribution network line
During fault, accomplish to disconnect in time the connection of microgrid group and power distribution network, not to distribution network failure at
The reverse increasing-aid current produced；When breaking down inside microgrid group, accomplish that relay protection fills
Put and promptly and accurately disconnect, it is ensured that the safe and stable operation of subordinate's circuit.Additionally, relaying configuration
Device economy, simple, it is not necessary to extra land used, protection act is independent of communication, and safety can
Lean on.Meanwhile, communication can be had mutual with the controller of micro-capacitance sensor again, it is ensured that in single micro-capacitance sensor
Portion's safe and stable operation, self-healing property is strong.
In the present invention, term " first ", " second ", " the 3rd ", " the 4th " are only used for retouching
State purpose, and it is not intended that indicate or hint relative importance.Term " multiple " refers to two
Or two or more, unless otherwise clear and definite restriction.
Although being described in conjunction with the accompanying embodiments of the present invention, but those skilled in the art can
To make various modifications and variations without departing from the spirit and scope of the present invention, so
Amendment and within the scope of modification each falls within and is defined by the appended claims.
Claims (7)
1. the relaying configuration method of a microgrid group, it is characterised in that described microgrid group includes
Microgrid group's bus, multiple microgrid interconnection and multiple micro-capacitance sensor, each micro-capacitance sensor passes through first segment
Point switch connects one to one with each microgrid interconnection, and each microgrid interconnection is joined by microgrid
Winding thread higher level switch is connected with described microgrid group's bus, and described microgrid group's bus passes through secondary nodal point
Switch is connected with higher level's power distribution network；Each micro-capacitance sensor include micro-capacitance sensor bus, distributed power source,
Energy-storage units, load cell and controller, described distributed power source, described energy-storage units and institute
State load cell to be all connected with described micro-capacitance sensor bus by grid-connected switch；Described collocation method bag
Include:
First overcurrent protective device and first is set at the grid-connected switch of described distributed power source
Directional element, described overcurrent protective device is for there is event at described distributed power source place branch road
Opening two-period form overcurrent protection during barrier, it is sensing that described first direction element is used for making the sense of current
The electric current of described distributed power source flows through.
Method the most according to claim 1, it is characterised in that described collocation method also wraps
Include:
Second overcurrent protective device is set at the grid-connected switch of described load cell, described second
Overcurrent protective device for opening two-period form when described load cell place branch road breaks down
Overcurrent protection.
Method the most according to claim 1, it is characterised in that described collocation method also wraps
Include:
The 3rd overcurrent protective device and second direction unit is configured at each primary nodal point switch
Part, described 3rd overcurrent protective device occurs for the microgrid interconnection connected at this primary nodal point
Fail-open syllogic overcurrent protection, it is finger that described second direction element is used for making the sense of current
Electric current to described higher level's power distribution network flows through.
Method the most according to claim 1, it is characterised in that described collocation method also wraps
Include:
The 4th overcurrent protective device and third party is configured at each microgrid interconnection higher level's switch
To element, described 4th overcurrent protective device is for switching correspondence this microgrid interconnection higher level
Opening syllogic overcurrent protection when micro-capacitance sensor bus breaks down, described third direction element is used for
Making the sense of current is to point to this microgrid interconnection higher level to switch primary nodal point switch in the branch road of place
Electric current flow through.
Method the most according to claim 1, it is characterised in that described collocation method also wraps
Include:
Configuring differential protection on described microgrid group's bus, described differential protection is used for
Bus differential protecting is opened when described microgrid group's bus breaks down.
Method the most according to claim 1, it is characterised in that described collocation method also wraps
Include:
Module, described isolated island protection module is protected to be used at described secondary nodal point switchgear distribution isolated island
When described higher level's power distribution network breaks down, described secondary nodal point is switched tripping, carry out isolated island guarantor
Protect.
Method the most according to claim 1, it is characterised in that described collocation method also wraps
Include:
Isolated island protection module, described isolated island protection mould is configured in the inverter of described energy-storage units
Block for opening isolated island protection when described load cell place branch road breaks down.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109599869A (en) * | 2017-09-30 | 2019-04-09 | 南京南瑞继保电气有限公司 | Method and stable control method based on the big load building safety island system of large-sized unit |
| CN109995070A (en) * | 2017-12-29 | 2019-07-09 | 西门子公司 | Micro-grid system |
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| CN109599869B (en) * | 2017-09-30 | 2022-04-19 | 南京南瑞继保电气有限公司 | Method for constructing safety island system based on large unit and large load and stability control method |
| CN109599869A (en) * | 2017-09-30 | 2019-04-09 | 南京南瑞继保电气有限公司 | Method and stable control method based on the big load building safety island system of large-sized unit |
| CN109995070A (en) * | 2017-12-29 | 2019-07-09 | 西门子公司 | Micro-grid system |
| CN111433992B (en) * | 2018-01-31 | 2023-09-19 | 西门子股份公司 | Power grid fault detection method and device with distributed energy sources |
| CN111433992A (en) * | 2018-01-31 | 2020-07-17 | 西门子股份公司 | Method and device for detecting power grid fault with distributed energy sources |
| US11831158B2 (en) | 2018-01-31 | 2023-11-28 | Siemens Aktiengesellschaft | Power grid fault detection method and device with distributed energy resource |
| CN110120657B (en) * | 2018-02-06 | 2022-04-08 | 西门子公司 | Unit power grid protection device, large power grid and method for controlling unit power grid protection device |
| US11309706B2 (en) | 2018-02-06 | 2022-04-19 | Siemens Aktiengesellschaft | Nano grid protection device, large power grid and a method for controlling a nano grid protection device |
| CN110120657A (en) * | 2018-02-06 | 2019-08-13 | 西门子公司 | The method of unit electric network protection device, bulk power grid and control unit electric network protection device |
| CN110401178A (en) * | 2018-04-25 | 2019-11-01 | 施耐德电器工业公司 | Micro-capacitance sensor overcurrent protective device |
| US11532932B2 (en) | 2018-04-25 | 2022-12-20 | Schneider Electric Industries Sas | Microgrid overcurrent protection device |
| CN110401178B (en) * | 2018-04-25 | 2023-10-10 | 施耐德电器工业公司 | Micro-grid overcurrent protection equipment |
| WO2023246169A1 (en) * | 2022-06-22 | 2023-12-28 | 上海勘测设计研究院有限公司 | Fault clearing method for alternating-current bus of energy storage power station |
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