CN106410766A - DG grid-connected electric system high acceptance protection method - Google Patents
DG grid-connected electric system high acceptance protection method Download PDFInfo
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- CN106410766A CN106410766A CN201610996210.XA CN201610996210A CN106410766A CN 106410766 A CN106410766 A CN 106410766A CN 201610996210 A CN201610996210 A CN 201610996210A CN 106410766 A CN106410766 A CN 106410766A
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- grid
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- longitudinal differential
- netting twine
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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
-
- 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
- H02H7/267—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 parallel lines and wires
-
- 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
- H02J3/381—Dispersed generators
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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
Abstract
The invention discloses a DG grid-connected electric system high acceptance protection method, which comprises the following steps: when a line has fault, carrying out corresponding protection actions according to whether a grid-connected DG system side grid-connection line is provided with longitudinal differential protection; when the grid-connected DG system side grid-connection line is provided with the longitudinal differential protection, and the line has fault, carrying out line protection action to trip off a line system side circuit breaker, and intertrip off a grid-connection line switch; and when the grid-connected DG system side grid-connection line is not provided with the longitudinal differential protection, and the line has fault, carrying out line protection action to trip off the line system side circuit breaker, and carrying out main transformer high standby zero-sequence overvoltage protection to trip off a transformer high-voltage side switch and intertrip off the DG grid-connection line switch. The DG grid-connected electric system high acceptance protection method is good in flexibility and high in acceptance, can ensure safe and reliable operation of the system, and can ensure benefit of DG service providers to the largest degree.
Description
Technical field
The present invention relates to a kind of be based on the high containment guard method of DG interconnected electric power system.
Background technology
In today of intelligent grid fast development, predict that future, more and more newly generating construction will be by IPP (Independent Power Generation
Business) complete.Many dispersion units will be grid-connected with electrical network in less industry and commercial facility, be reduced with shared or " peak regulation " mode
Consumed by local load energy, this power generation mode based on " converge with Sha Chengta " bring benefit, convenient while, also so that
The management of distributed power source becomes each side's focus of attention.
Most of distributed generation unit (hereinafter referred to as " DG ") would generally be connected to electric power system by intermediate equipment and join
Net and transformer station.And these electrical networks are according to the design of radiant type supply network at the beginning of design, do not consider that local DG sends out
Exhibition to a certain degree when impact to local " malfunction ".And it is known that DG decoupled mode tape splicing external load
Mode does not allow, and mainly has two reasons：
1. automatic reclosing can be made in DG islet operation, and during manual switching, require electromotor/load (isolated island) to arrive to supply
The synchronizing process of electric system is complicated.
2. the quality of power supply (voltage, frequency harmonic) generally can not be maintained at an acceptable level in DG islet operation, meeting
Cause customer equipment infringement of powering.
Consider that thorough design protection should solve the interests of DG owner and electric power system both sides simultaneously, in the relatively low water of expense
The flat lower maximization maintaining common interest.In DG, grid-connected defencive function is real by detecting DG asynchronous " anti-isolated island " state
Existing, in the state of system determines electromotor off-grid, in other words, just can carry out the protection behavior of next step.Therefore " lonely
The detection of island state " and junction point tripping operation quickly just must can make system side automatic reclosing correctly be executed enough.
Content of the invention
The purpose of the present invention is exactly to solve the above problems, and provides based on DG interconnected electric power system high containment protection side
Method, motility is good, and receivability, by force it is ensured that the safe and reliable operation of system, also can at utmost ensure DG operator
Interests.
To achieve these goals, the present invention adopts the following technical scheme that：
Based on the high containment guard method of DG interconnected electric power system, including：During line failure, according to grid-connected DG system
Side whether netting twine installs longitudinal differential protection additional to carry out corresponding protection act；
Grid-connected DG system side netting twine installs longitudinal differential protection additional, when line failure, route protection action tripping
Line system side chopper, grid-connected wiretap cut by connection；
Grid-connected DG system side netting twine does not have longitudinal differential protection, when line failure, route protection action tripping
Line system side chopper, main transformer high standby zero sequence overvoltage tripping high voltage side of transformer switch in parallel cuts the grid-connected wiretap of DG.
When main transformer breaks down, no matter grid-connected DG system side whether netting twine installs longitudinal differential protection additional, it is all that main transformer is protected
The shield action tripping transformator high and low side chopper parallel connection grid-connected wiretap of DG.
During grid-connected DG system jam, no matter grid-connected DG system side whether netting twine installs longitudinal differential protection additional, it is all
Protection act isolated fault point, grid-connected DG low-frequency and low-voltage off-the-line, excessively stream quick acting and system sectionalizing, enter islet operation side
Formula.
Grid-connected DG system side netting twine installs longitudinal differential protection additional, when line failure, if unplanned property is lonely
Island, then the switch that grid-connected DG system is connected with substation bus bar adopts checkout voltage to overlap.
Grid-connected DG system side netting twine installs longitudinal differential protection additional, when line failure, if planned isolated island,
Grid-connected DG system configuration circuit PT, was overlapped using the inspection same period.
Grid-connected DG system side when netting twine does not have longitudinal differential protection, transformator mesolow side fanout operation.
Grid-connected DG system side when netting twine does not have longitudinal differential protection, high pressure inlet wire is standby to be thrown after system side switches tripping,
Start standby throwing through frequency change rate, the grid-connected wiretap of DG is cut in tripping high side switch parallel connection.
Grid-connected DG system side when netting twine does not have longitudinal differential protection, the high and low side neutral point of online transformator connects through gap
Ground, zero sequence overvoltage action tripping main transformer both sides switch in parallel cuts the grid-connected wiretap of DG.
Beneficial effects of the present invention：
Whether the present invention situation grid-connected to the DG under Thief zone degree, adopt during according to grid-connected DG property, synchronizing mode, fault
With the relaying configuration of decoupled mode and corresponding system side, give have targetedly, ensure system reliability service again
Do not lose the protection scheme of opening.The protection scheme that this motility is good, receivability is strong, not only can ensure the safety of system
Reliability service, also can at utmost ensure the interests of DG operator, realize doulbe-sides' victory truly.
Brief description
Fig. 1 is the typical relaying configuration on grid-connected transformer secondary side；
Fig. 2 is by transformer primary avris Y earthing mode grid-connected DG typical case's relaying configuration；
Fig. 3 is standard guidelines framework and corresponding engineering practice Standard Map；
Fig. 4 is distributed power source through access via telephone line 10kV (6kV)～35kV system typical wiring；
Fig. 5 is distributed power source through access via telephone line system (having differential protection) protection and off-the-line scheme；
Fig. 6 accesses 110kV bus arrangement figure for wind energy turbine set；
Fig. 7 protects definite value figure for zero-sequencedirectional protection；
Fig. 8 accesses 110kV bus arrangement figure (no differential protection) for DG；
Fig. 9 is the grid-connected transitional protection of DG and off-the-line scheme；
Figure 10 is transformator each side zero-sequence current and residual voltage during different faults；
Figure 11 (a) is the analogous diagram of failure situations (1)；Figure 11 (b) is the analogous diagram of failure situations (2)；Figure 11 (c) is event
The analogous diagram of barrier situation (3).
Specific embodiment
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
1DG and basic principle
1.1DG standard setting principle
In terms of attempting to promote DG Grid-connection standards and criterion, power system repeatedly has tried to have carried out DG " specification " grid-connected
Protection requires.Main is as follows：
A. the type of DG electromotor is done and classify：All kinds DG electromotor is divided into three major types：
1) synchronous generator：Comprise electromotor, gas turbine and small power station
2) influence generator：Mainly wind-driven generator
3) asynchronous generator：Comprise Microturbine, fuel cell and photovoltaic.
These generator types have different electrical characteristics and therefore have different interconnection protection requirements.Most common at present
Type DG be synchronous generator.
B. issue IEEE-1547 specification, attempting interconnecting for DG provides national standard：But IEEE-1547 mutual UNPROFOR to DG
Shield requirement provides very limited amount of actual guidance.It required/under-frequency and overvoltage/under-voltage interconnection protection.It is clearly fixed
Justice assemble and interlinking interconnection between DG and the public coupling of electric power system (PCC) point is protected.This standard it further provides that DG net operation requirement,
But do not provide solution or alternative, to meet these requirements.Following key issue is not resolved：1) potential
Overvoltage；2) selection of interconnected transformers；3) cooperation that the protection of DG side is protected with system side；4) system side non-three phase or step-out
The out-of-balance current being not reaching to level of movement and causing is protected to damage DG.
C. the protection of some grid entry points uses the design of " electric fuse " type, and using not jumping as far as possible, grade tripping circuit is grid-connected
The mode of point.Some protections using circuit re-switching and sectionaliser design, but the actually used method of automatic reclosing also each not
Identical.
In sum, we are badly in need of can directly instructing specification and the standard of engineering practice in engineering practice.
The grid-connected protection of 1.2PCC point and generator protection
Under normal circumstances, relay protection scheme protection requires to be to be determined by DG owner or power system instructional criterion.
These criterions generally comprise for small generator.High-rating generator, generally more than 10MVA, then need to carry out menu trial at nisi prius
Look into, and be typically connected to transmission system.These high-rating generators generally do not adopt specific grid-connected protection, because they are as defeated
The protection of electric system.DG (10MVA or less) is typically connected to distribution system or transformer station.And power distribution network is by single supply radiation
Net design.A new power supply point will be increased local when DG accesses, it can redistribute power supply circuits load and
Fault current, becomes the potential source of " overvoltage ".Under normal circumstances, these generator connecting in parallel with system protection be built upon public grid-connected
(PCC) put.As shown in Figure 1.
Grid-connected relaying configuration meets during related request and just to allow DG grid-connected.The function of this protection is three aspects：
1st, when DG and system do not resynchronize, disconnect DG.
2nd, prevent electric power system because of the grid-connected caused damage of DG, including the instantaneous mistake causing because of the fault current that DG provides
Voltage.
3. protect DG not damaged by electric power system, particularly the automatic reclosing after the system failure.
For common generator protection, it can the short circuit of automatic detection generator and misoperation working condition, example
As loss of excitation, anti-power, overexcitation and out-of-balance current.But for less DG, great majority are to select electromotor by DG owner
Relaying configuration level, this is often inadequate.Typically now principle guidance is carried out to grid-connected relaying configuration by electric company.Logical
In the case of often, the following aspects can do specific requirement：1) winding construction of grid-connected transformator；2) CT and VT requires；3) protect
Functional requirement；4) requirement of DG off-grid speed；5) relate to the requirement of net protection definite value and system side protection act.
The grid-connected protection philosophy of 1.3PCC point requires and engineering practice extends
Fig. 2 is the equipping rules of the protection in IEEE1547 specification, and the concrete relaying configuration that can be mapped as in Fig. 3 will
Ask.I.e. 1) realize eliminating exception and failure operation shape by the grid-connected protection of PCC and fault disconnection function (inclusion reclosing mode)
State is it is ensured that electrical network reliability service；2) pass through anti-islanding and join the off-grid protection cutting in functional realiey principles and requirements and load transfer.
The protection scheme based on the grid-connected high containment of DG for 2 power systems
2.1 for grid-connected DG system side and netting twine installs the mode of longitudinal differential protection additional, as shown in figure 4, giving one
Specific embodiment, DG is through access via telephone line 10kV (6kV)～35kV system typical case's protection scheme.
General power system is grid-connected for the DG tackling Thief zone degree, simultaneously in order to ensure the safe operation of electrical network, typically
Using relatively conservative way：I.e. in its system side and netting twine installs longitudinal differential protection additional, when system side breaks down, connection is cut simultaneously
Net DG, but DG can be chosen whether to adopt decoupled mode by the regional load balanced capacity of itself.But adopt islet operation side
During formula, synchronized detection device can be installed on grid entry point additional, prevent asynchronous parallelizing from bringing impact to electrical network.For grid-connected transformation
Device protection scheme, the selection of the method for operation will take into full account DG capacity and the balanced capacity to local load.When DG capacity relatively
Greatly, and when possessing certain island operating capacity, just it is also contemplated that the grid-connected transformator of ground connection, when being made by relay settings verification
When the reduction of system zero sequence protection sensitivity cannot correctly judge feeder terminal fault, then install automatic circuit additional on grid-connected transformator,
Using little zero-sequenceprotection definite value as the grid-connected transformator of auxiliary protection tripping, with the sensitivity of recovery system protection.And DG capacity
Less, when not possessing the island operating capacity to local load, just it is also contemplated that adopting earth-free grid-connected transformator, at this moment will not
Therefore destroy the conformability with system protection because introducing other earth point, and alerted using zero sequence overvoltage.
As shown in Figure 4, because DG is grid-connected by special line, therefore grid entry point is coupling and the point PCC of system, as long as grid entry point
Protection and simultaneously netting twine protection are perfect, and the safe and reliable operation of its system side can be ensured.Therefore, from this principle,
Electric company specifies that grid-connected circuit adopts differential protection to configure, with the various fault of level identification；Simultaneously in order to not cause DG more simultaneously
The impact to system for the net, employs fault disconnection device, and when that is, simultaneously netting twine breaks down, 1DL, 2DL all have tripping operation jump in parallel simultaneously
Net switch 3DL function.Its concrete protection scheme is as shown in Figure 5.
From above scheme it can also be seen that system side is ensureing simultaneously netting twine protection, to ensure before system side safe operation
Put, for DG whether using plan isolated island mode, employ open principle.It is embodied in：Grid-connected line system side 1DL is using inspection
No ballast closes, and points out it is for unplanned property isolated island；If adopting planned isolated island, due to being configured with circuit PT, permissible
Realize inspection same period coincidence, this just provides guarantee for the grid-connected again of DG island operation state.
The 2.2 wind field relaying configuration schemes based on low-impedance earthed system
Fig. 6 gives the transformer grounding mode of grid-connected wind park and related zero-sequenceprotection principle is illustrated
Figure.The total installation of generating capacity of its wind field is 300,000 kilowatts, and blower fan is divided into 1.8MW and two kinds of patterns of 2.3MW, and its model is respectively
EN21/EN23B type.Its grid-connected voltage grade is 220kV.Ground connection becomes through low resistance grounding, and earth resistance is 108 Europe.Wind field is adopted
With grounding transformer low-impedance earthed system mode, its parameter is as shown in the table：
Table 1 Table 1
| Rated capacity | 450/35kVA | Model specification | DKSK-450-35 |
| Rated voltage | 36.75/0.4kV | Rated current | 7.1/49.2A |
| Impedance voltage | 8% | Connecting group grade | Znyn11 |
The earthing mode that in system station, 220kV transformator is become with station in the grid-connected field of wind field, by its whole grid-connected system
Zero-sequence network is divided into 3 autonomous systems.The earthing mode TN-C-S wiring of the wherein blower fan of the bottom, will be separated into PE by PEN
3 phase 4 line mode with N.And blower fan becomes grid-connected by case, the connecting group grade that its case becomes is D, yn11 wiring, therefore not aweather
Zero sequence short circuit current is provided, its ground protection is 0.35In, 0.2S, independent one section, need not coordinate in station.2nd independent system
Unite as wind farm system, its earth current size is to become ground connection zero sequence impedance by station to determine, unrelated with the method for operation of DG.With
When it is contemplated that ground connection can make low-pressure side lose ground connection after becoming tripping, isolated neutral system overvoltage in station can be caused by blower fan, because
This, stand become the tripping operation strategy taken of zero-sequence current protection into：Action one time limit jumps low-pressure side segmentation, and two time limits jumped grounding transformer
High-pressure side chopper and supply transformer low-pressure side chopper.
Fig. 7 embodies zero-sequence current change curve and the configuration of corresponding zero-sequence current protection definite value of wind field grid-connected system.
It can be seen that whole zero sequence system, due to the difference of earthing mode, is divided into three independent zero-sequenceprotection systems
I.e. 220kV, 35kV and 0.4kV tri-；Change for its zero-sequence current in each system is continuous, and between three sections of curves is
Sectional curve.Therefore three systems are not required to cooperate, and itself can form independent protective to serve as master, the standby guarantor of the system
Shield.Just because of above feature, it is relatively low that its quick-action section definite value still can use, and wherein being given of definite value is all volume with this voltage side
On the basis of determining electric current.Can not be affected by the normal blower fan method of operation when using zero-sequenceprotection, it puts into or exits all not
Impact protection definite value, its definite value depends primarily on transformer grounding mode and its zero sequence impedance.The protection system being formed therefrom
Relaying configuration exactly required by system.It is as follows that ground connection becomes zero-sequence current result of calculation：
Far smaller than it is grounded transformation in view of electric power system bus bar impedance and faulty line positive sequence, zero sequence impedance value
Device zero sequence impedance and neutral resistance, can consider during simple and practical calculating as the following formula：
If per unit value calculates：
I(1)0:System single-phase earth fault zero-sequence current
X1∑:Trouble point synthesis positive sequence impedance
X2∑:Trouble point synthesis negative sequence impedance
X0∑:Trouble point synthesis zero sequence impedance
UФN:System nominal phase voltage
RN:Grounding transformer neutral resistance
Rg0:Grounding transformer zero sequence resistance
Xg0:Grounding transformer zero-sequence reactance
IB:Corresponding voltage grade reference current
RN’:Grounding transformer neutral resistance per unit value
Xg0’:Grounding transformer zero-sequence reactance per unit value
Calculate according to perunit value：
2.3 grid-connected DG system side netting twine does not have longitudinal differential protection
In Practical Project, this DG through inverter access system for photovoltaic, it provides the ability of short circuit current to have
Limit, therefore still can be regarded as load and process, and simply need protection to complete fault disconnection function with automaton cooperation.But
When relaying configuration can not be perfect in time situation be accomplished by carefully analyzing after can formulate suitable setting program.Fig. 8 is photovoltaic
DG is through access via telephone line 110kV bus arrangement figure.Wherein MV/LV transformer station adopt for internal cavity quality, therein 01,02
For disconnecting link, wherein tripping operation connection is cut and netting twine L1 function, is to cut functional realiey by 03 switch trip connection.At the design initial stage.This power transformation
Station is considered as end stations, therefore, is configured without protection device in transformer substation side switch (03,04).Two main transformers connect through discharging gap
Ground, master one is standby for inlet wire one, using standby throwing mode.
But when DG accesses transformer station, relaying configuration is undesirable, analyzed according to above, quickly the cutting of fault to be realized
Remove, need to adopt fault disconnection to design fault, can be by following two approach：1. standby Union Switch Device of throwing adopts inspection frequency certainly
Dynamic coincidence system, standby throwing is jumped into wiretap 03 startup connection and is cut DG grid-connected wiretap PD1；2. transformator gap overvoltage protection,
During tripping 03, grid-connected wiretap PD1 cut by connection.Concrete protection scheme is as shown in Figure 9.
The present invention is directed to the grid-connected situation of DG under Thief zone degree, according to when grid-connected DG property, synchronizing mode, fault whether
Using the relaying configuration of decoupled mode and corresponding system side, give have targetedly, ensure system reliability service
Do not lose the protection scheme of opening again.This motility, protection scheme that receivability is strong, not only can ensure the peace of system
Full reliability service, also can at utmost ensure the interests of DG operator, realize doulbe-sides' victory truly.
It is below specific simulation result.
A wind field based on PSCAD pessimistic concurrency control, since it is considered that 110kV earthing mode, adopt here for grid-connected
The mode of high voltage side of transformer ground connection；In wind field, transformator is through low-impedance earthed system.Figure 10 provides each side zero-sequence current data.
Note：V0hChopper high-pressure side residual voltage (kV)
V0Chopper low-pressure side residual voltage (kV)
I0CB9Flow through CB9 zero-sequence current (A)
I0CB7Flow through CB7 zero-sequence current (A)
Failure situations：
(1) CB7 place line fault, transformer triangle side non-zero-sequence current, and there is earth point in CB9 place circuit,
Zero-sequence current forms path, and CB7, CB9 all flow through zero-sequence current.Emulate shown in following Figure 11 (a).
(2) bus-bar fault, flows through the electric current of CB9.Emulate shown in following Figure 11 (b).
(3) break down (Y/ Δ wiring) in high-pressure side, and winding equal non-zero-sequence current in transformator both sides passes through.Emulation below figure
Shown in 11 (c).
(4) (Y/ Δ wiring) trouble point is broken down at the bus1 of CB1 upstream in high-pressure side.The residual voltage that fault produces adds
In high-pressure side, zero-sequence current forms loop with clicking and entering by neutrality, and induce in low pressure delta windings three equal in magnitude,
Phase place identical electromotive force, zero-sequence current forms loop only in delta windings, will not flow on the circuit outside winding, therefore low
Line ball road no residual voltage.
The present embodiment requirement that power system is protected to it when distributed generator (DG) is grid-connected through discussion, and fault
The again grid-connected method of DG after tripping operation, in conjunction with the typical attempts in a large amount of engineering practices, gives power system and faces Thief zone
Conservative management scheme during property DG.This principle is with the protection device of management and control grid entry point (PCC point) and automatic safety device for incision
Point, after taking into full account the factors such as DG property, synchronizing mode, failure operation mode, before ensureing power grid security reliability service
Put, take into full account the interests of DG operator, establish the protection scheme that a principle of management is clear, have high containment to DG.
In the present invention it is considered to DG protects when the specified point (distribution and middle pressure transmission system) of power system is grid-connected and opens
Close and configure incomplete situation, formulated the upgrading scheme of a set of protection automaton being applied to special circumstances.This is former
It is then that Electric Design and relay protection engineering staff provide the effective solution of complete set.
Although the above-mentioned accompanying drawing that combines is described to the specific embodiment of the present invention, not model is protected to the present invention
The restriction enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme, and those skilled in the art are not
Need to pay the various modifications that creative work can make or deformation still within protection scope of the present invention.
Claims (8)
1. it is based on the high containment guard method of DG interconnected electric power system, it is characterized in that, including：During line failure, according to simultaneously
Net DG system side and whether netting twine installs longitudinal differential protection additional to carry out corresponding protection act；
Grid-connected DG system side netting twine installs longitudinal differential protection additional, when line failure, route protection action tripping circuit
System side chopper, grid-connected wiretap cut by connection；
Grid-connected DG system side netting twine does not have longitudinal differential protection, when line failure, route protection action tripping circuit
System side chopper, main transformer high standby zero sequence overvoltage tripping high voltage side of transformer switch in parallel cuts the grid-connected wiretap of DG.
2. it is based on the high containment guard method of DG interconnected electric power system as claimed in claim 1, it is characterized in that, main transformer breaks down
When, no matter grid-connected DG system side whether netting twine installs longitudinal differential protection additional, it is all main transformer protection action tripping transformator height
The side chopper parallel connection grid-connected wiretap of DG.
3. it is based on the high containment guard method of DG interconnected electric power system as claimed in claim 1, it is characterized in that, grid-connected DG system is sent out
During raw fault, no matter grid-connected DG system side whether netting twine installs longitudinal differential protection additional, it is all protection act isolated fault point, and
Net DG low-frequency and low-voltage off-the-line, excessively stream quick acting and system sectionalizing, enter decoupled mode.
4. it is based on the high containment guard method of DG interconnected electric power system as claimed in claim 1, it is characterized in that, grid-connected DG system side
And netting twine installs longitudinal differential protection additional, when line failure, if unplanned property isolated island, then grid-connected DG system and change
The switch that power station bus connects adopts checkout voltage to overlap.
5. it is based on the high containment guard method of DG interconnected electric power system as claimed in claim 1, it is characterized in that, grid-connected DG system side
And netting twine installs longitudinal differential protection additional, when line failure, if planned isolated island, grid-connected DG system configuration circuit
PT, was overlapped using the inspection same period.
6. it is based on the high containment guard method of DG interconnected electric power system as claimed in claim 1, it is characterized in that, grid-connected DG system side
And netting twine is not when having longitudinal differential protection, transformator mesolow side fanout operation.
7. it is based on the high containment guard method of DG interconnected electric power system as claimed in claim 1, it is characterized in that, grid-connected DG system side
And netting twine is not when having longitudinal differential protection, high pressure inlet wire is standby to be thrown after system side switches tripping, through frequency change rate start standby throw,
The grid-connected wiretap of DG is cut in tripping high side switch parallel connection.
8. it is based on the high containment guard method of DG interconnected electric power system as claimed in claim 1, it is characterized in that, grid-connected DG system side
And netting twine is not when having longitudinal differential protection, the high and low side neutral point of online transformator is through gap ground, zero sequence overvoltage action tripping
Main transformer both sides switch in parallel cuts the grid-connected wiretap of DG.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106981030A (en) * | 2017-03-22 | 2017-07-25 | 华中科技大学 | A kind of grid-connected characteristics of DG to the power distribution network containing DG, the method for receiving ability to carry out quantitative evaluation |
| CN107221919A (en) * | 2017-07-14 | 2017-09-29 | 国网辽宁省电力有限公司 | A kind of method for improving the power distribution network reliability of relay protection containing distributed power source |
| CN108023366A (en) * | 2018-01-25 | 2018-05-11 | 南京工程学院 | A kind of method of anti-neutral point of main transformer overvoltage for Thief zone photovoltaic |
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| CN107221919B (en) * | 2017-07-14 | 2019-07-12 | 国网辽宁省电力有限公司 | A method of improving the power distribution network reliability of relay protection containing distributed generation resource |
| CN108023366A (en) * | 2018-01-25 | 2018-05-11 | 南京工程学院 | A kind of method of anti-neutral point of main transformer overvoltage for Thief zone photovoltaic |
| CN109217266A (en) * | 2018-09-06 | 2019-01-15 | 南京国电南自电网自动化有限公司 | Small power station's adaptive direction current protection definite value switching method, device and equipment |
| CN109217266B (en) * | 2018-09-06 | 2019-11-12 | 南京国电南自电网自动化有限公司 | Small power station's adaptive direction current protection definite value switching method, device and equipment |
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| CN109950882B (en) * | 2019-03-29 | 2021-06-08 | 国网山东省电力公司枣庄供电公司 | Small power supply grid-connected protection method |
| CN112510820A (en) * | 2020-11-11 | 2021-03-16 | 广西电网有限责任公司电力科学研究院 | System for automatic splitting of distributed power supply under 10kV feeder line fault |
| CN116780488A (en) * | 2023-08-16 | 2023-09-19 | 山西迎润新能源有限公司 | New energy power station grounding protection system, method, electronic equipment and storage medium |
| CN116780488B (en) * | 2023-08-16 | 2023-11-14 | 山西迎润新能源有限公司 | New energy power station grounding protection system, method, electronic equipment and storage medium |
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