CN106410766B - Based on the high containment guard method of DG interconnected electric power systems - Google Patents
Based on the high containment guard method of DG interconnected electric power systems Download PDFInfo
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- CN106410766B CN106410766B CN201610996210.XA CN201610996210A CN106410766B CN 106410766 B CN106410766 B CN 106410766B CN 201610996210 A CN201610996210 A CN 201610996210A CN 106410766 B CN106410766 B CN 106410766B
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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
-
- 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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- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses based on the high containment guard method of DG interconnected electric power systems, including：During line failure, corresponding protection act is carried out according to whether grid-connected DG system sides and netting twine install longitudinal differential protection additional；Simultaneously netting twine installs longitudinal differential protection additional to grid-connected DG system sides, when line failure, and route protection action tripping line system side breaker, connection cuts grid-connected wiretap；Simultaneously netting twine does not have longitudinal differential protection to grid-connected DG system sides, when line failure, and route protection action tripping line system side breaker, the over-pressed tripping high voltage side of transformer switch in parallel of the high standby zero sequence of main transformer cuts the grid-connected wiretaps of DG.Flexibility is good, can admissibility it is strong, it is ensured that the safe and reliable operation of system, also can at utmost ensure the interests of DG operators.
Description
Technical field
The high containment guard method of DG interconnected electric power systems is based on the present invention relates to one kind.
Background technology
In today of intelligent grid fast development, the following increasing new generating construction of prediction will be by IPP (Independent Power Generations
Business) complete.Many scattered units will be grid-connected in less industry and commercial facility and power network, be reduced in shared or " peak regulation " mode
Consumed by local load energy, it is this based on " converge Sha Chengta " power generation mode bringing benefit, it is convenient while, also cause
The management of distributed power source turns into each side's focus of attention.
Most of distributed generation units (hereinafter referred to as " DG ") would generally be connected to electric power system by intermediate equipment and match somebody with somebody
Net and transformer station.And these power networks are designed according to radiant type supply network at the beginning of design, do not sent out in view of local DG
Exhibition to a certain degree when influence to local " malfunction ".And it is well known that DG decoupled mode tape splicing external loads
Mode does not allow, and mainly has two reasons：
1. automatic reclosing can be made in DG islet operations, and require generator/load (isolated island) to confession during manual switching
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 operations, meeting
Cause power supply customer equipment infringement.
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 maximization of flat lower maintenance common interest.In DG, grid-connected defencive function is by detecting that asynchronous " anti-isolated island " states of DG are real
It is existing, in other words, determine that generator could carry out the protection behavior of next step in the state of off-grid in system.Therefore it is " lonely
The detection of island state " and tie point tripping operation quickly just must can enable system side automatic reclosing correctly perform enough.
The content of the invention
The purpose of the present invention is exactly that there is provided based on the high containment protection side of DG interconnected electric power systems in order to solve the above problems
Method, flexibility is good, can admissibility it is strong, it is ensured that the safe and reliable operation of system, also can at utmost ensure DG operators
Interests.
To achieve these goals, the present invention is adopted the following technical scheme that：
Based on the high containment guard method of DG interconnected electric power systems, including：During line failure, according to grid-connected DG systems
Simultaneously whether netting twine installs longitudinal differential protection additional to carry out corresponding protection act for side；
Simultaneously netting twine installs longitudinal differential protection additional to grid-connected DG system sides, when line failure, route protection action tripping
Line system side breaker, connection cuts grid-connected wiretap；
Simultaneously netting twine does not have longitudinal differential protection to grid-connected DG system sides, when line failure, route protection action tripping
Line system side breaker, the over-pressed tripping high voltage side of transformer switch in parallel of the high standby zero sequence of main transformer cuts the grid-connected wiretaps of DG.
All it is that main transformer is protected no matter simultaneously whether netting twine installs longitudinal differential protection additional to grid-connected DG system sides when main transformer breaks down
Shield acts the grid-connected wiretaps of tripping transformer high and low side breaker parallel connection DG.
During grid-connected DG system jams, no matter simultaneously whether netting twine installs longitudinal differential protection additional to grid-connected DG system sides, all it is
Protection act isolated fault point, grid-connected DG low-frequency and low-voltages off-the-line, excessively stream quick acting and system sectionalizing, into islet operation side
Formula.
Simultaneously netting twine installs longitudinal differential protection additional to grid-connected DG system sides, when line failure, if unplanned property is lonely
Island, then the switch that grid-connected DG systems are connected with substation bus bar is overlapped using checkout voltage.
Simultaneously netting twine installs longitudinal differential protection additional to grid-connected DG system sides, when line failure, if planned isolated island,
Grid-connected DG system configurations circuit PT, is overlapped using the inspection same period.
When grid-connected DG system sides and netting twine do not have longitudinal differential protection, transformer mesolow side fanout operation.
When grid-connected DG system sides and netting twine do 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 wiretaps of DG are cut in tripping high side switch parallel connection.
When grid-connected DG system sides and netting twine do not have longitudinal differential protection, the high and low side neutral point of online transformer connects through gap
Ground, zero sequence overvoltage action tripping main transformer both sides switch in parallel cuts the grid-connected wiretaps 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 properties, synchronizing mode, failure
With decoupled mode and the relaying configuration of corresponding system side, give with targetedly, ensure system reliability service again
The protection scheme of opening is not lost.This flexibility is good, can the strong protection scheme of admissibility, can not only ensure the safety of system
Reliability service, also can at utmost ensure the interests of DG operators, realize doulbe-sides' victory truly.
Brief description of the drawings
Fig. 1 is the typical relaying configuration on grid-connected transformer secondary side；
Fig. 2 is by the typical relaying configurations of the grid-connected DG of transformer primary avris Y earthing modes；
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 wirings；
Fig. 5 is that distributed power source is protected and off-the-line scheme through access via telephone line system (having differential protection)；
Fig. 6 is that wind power plant accesses 110kV bus arrangement figures；
Fig. 7 is that zero-sequencedirectional protection protects definite value figure；
Fig. 8 is DG access 110kV bus arrangements figures (no differential protection)；
Fig. 9 is the grid-connected transitional protections of DG and off-the-line scheme；
Each side zero-sequence current of transformer and residual voltage when Figure 10 is 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
Hinder the analogous diagram of situation (3).
Embodiment
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
1DG and basic principle
1.1DG standard setting principles
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 is required.Main is as follows：
A. the types of DG generators is done and classified：All kinds DG generators are divided into three major types：
1) synchronous generator：Include engine, gas turbine and small power station
2) influence generator：Mainly wind-driven generator
3) asynchronous generator：Include Microturbine, fuel cell and photovoltaic.
These generator types have different electrical characteristics and therefore required with different interconnection protections.It is most common at present
Type DG be synchronous generator.
B. IEEE-1547 specifications are issued, attempt to provide national standard for DG interconnection：But IEEE-1547 is to the mutual UNPROFORs of DG
Shield requires to provide 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 protection between DG and the public coupling of electric power system (PCC) point.The standard it further provides that DG and net operation requirement,
But without solution or alternative is provided, to meet these requirements.Following key issue is not resolved：1) it is potential
Overvoltage；2) selection of interconnected transformers；3) cooperation that the protection of DG sides is protected with system side；4) system side non-three phase or step-out
The out-of-balance current for 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 " fuse " type, grid-connected using grade tripping circuit that do not jump as far as possible
The mode of point.Some protections are designed using circuit re-switchings and sectionaliser, but automatic reclosing actual use method also it is each not
It is identical.
In summary, we are badly in need of directly instructing the specification and standard of engineering practice in engineering practice.
The grid-connected protection of 1.2PCC points and generator protection
Under normal circumstances, relay protection scheme protection require to be determined by DG owner or power system instructional criterion.
These criterions are generally comprised 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 do not use specific grid-connected protection generally, because they are as defeated
The protection of electric system.DG (10MVA or smaller) is typically connected to distribution system or transformer station.And power distribution network is radiated by single supply
Net design.When DG is accessed will locality increase a new power supply point, it can redistribute power supply circuit load and
Fault current, the potential source as " overvoltage ".Under normal circumstances, the protection of these generator connecting in parallel with system is built upon public grid-connected
(PCC) put.As shown in Figure 1.
Grid-connected relaying configuration just allows DG grid-connected when meeting related request.The function of this protection is three aspects：
1st, when DG and system are not resynchronized, DG is disconnected.
2nd, damage of the electric power system caused by DG is grid-connected, including the instantaneous mistake caused by the fault current that DG is provided are prevented
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
Such as loss of excitation, anti-power, overexcitation and out-of-balance current.But for less DG, most of is to select generator by DG owner
Relaying configuration level, this is often inadequate.Principle guidance typically now is carried out to grid-connected relaying configuration by electric company.It is logical
In the case of often, the following aspects can do specific requirement：1) winding construction of grid-connected transformer；2) CT and VT requirements；3) protect
Functional requirement；4) requirement of DG off-grids speed；5) net protection definite value and the requirement of system side protection act are related to.
The grid-connected protection philosophy requirement of 1.3PCC points and engineering practice extension
Fig. 2 is the equipping rules of the protection in IEEE1547 specifications, and the specific relaying configuration that can be mapped as in Fig. 3 will
Ask.1) realize by the grid-connected protections of PCC and fault disconnection function (including reclosing mode) and eliminate exception and failure operation shape
State, it is ensured that power network reliability service；2) the off-grid protection and load transfer in function realization principle requirement are cut by anti-islanding and connection.
Protection scheme of 2 power systems based on the grid-connected high containment of DG
2.1 for grid-connected DG system sides and netting twine installs the mode of longitudinal differential protection additional, as shown in figure 4, giving one
Specific embodiment, DG is through the typical protection scheme of access via telephone line 10kV (6kV)~35kV systems.
General power system is grid-connected for the DG for tackling Thief zone degree, while the safe operation in order to ensure power network, typically
Using relatively conservative way：I.e. in its system side, simultaneously netting twine installs longitudinal differential protection additional, and connection is cut simultaneously when system side breaks down
DG is netted, but DG can be chosen whether to use decoupled mode by the regional load balanced capacity of itself.But use islet operation side
During formula, synchronized detection device can be installed additional in grid entry point, prevent asynchronous parallelizing from bringing impact to power 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 compared with
Greatly, and when possessing certain island operating capacity, it should just consider the grid-connected transformer of ground connection, make when by relay settings verification
When the reduction of system zero sequence protection sensitivity can not correctly judge feeder terminal failure, then automatic circuit is installed additional on grid-connected transformer,
Using small zero-sequenceprotection definite value as the grid-connected transformer of auxiliary protection tripping, the sensitivity protected with recovery system.And DG capacity
It is smaller, when not possessing the island operating capacity to local load, earth-free grid-connected transformer should be just considered as, at this moment will not
The conformability with system protection is therefore destroyed because other earth point is introduced, and using zero sequence overvoltage alarm.
As shown in Figure 4, because DG is grid-connected by special line, therefore grid entry point is the coupling and 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 provides that grid-connected circuit is configured using differential protection, with the various failures of level identification；Simultaneously in order to not cause DG again simultaneously
Impact of the net to system, employs fault disconnection device, i.e., when simultaneously netting twine breaks down, 1DL, and 2DL has tripping operation and shunt tripping is simultaneously
Net switch 3DL functions.Its specific 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
Closed without ballast, and point out it is to be directed to unplanned property isolated island；If, can be with due to being configured with circuit PT using planned isolated island
Realize that the inspection same period overlaps, this is just ensured for grid-connected again provide of DG island operation states.
The 2.2 wind field relaying configuration schemes based on low-impedance earthed system
The transformer grounding mode and related zero-sequenceprotection principle that Fig. 6 gives grid-connected wind park are 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 types.Its grid-connected voltage grade is 220kV.Ground connection becomes through low resistance grounding, and grounding 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 1Table 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 220kV transformers become with station in the grid-connected field of wind field in system station, by its whole grid-connected system
Zero-sequence network is divided into 3 autonomous systems.Wherein the earthing mode TN-C-S wiring of the blower fan of the bottom, i.e., be separated into PE by PEN
With the N line mode of 3 phase 4.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 flow is provided in station, its ground protection is 0.35In, 0.2S, one section of independence, without coordinating.2nd independent system
Unite as wind farm system, its earth current size is to become ground connection zero sequence impedance by station to determine that the method for operation with DG is unrelated.Together
When, it is contemplated that ground connection, which becomes after tripping, can make low-pressure side lose ground connection, and 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：Time limit jump low-pressure side segmentation is acted, two time limits jumped grounding transformer
High-pressure side breaker and supply transformer low-pressure side breaker.
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 is divided into three independent zero-sequenceprotection systems due to the difference of earthing mode
That is 220kV, 35kV and 0.4kV tri-；Change for its zero-sequence current in each system is continuous, and is between three sections of curves
Sectional curve.Therefore three systems are not required to cooperate, and itself can form independent protective and be protected to serve as the master of the system, standby
Shield.Just because of above feature, its quick-action section definite value is still desirable relatively low, and wherein providing for definite value is volume with this voltage side
On the basis of determining electric current.It can not be influenceed when using zero-sequenceprotection by the normal blower fan method of operation, it puts into or exited not
Influence protection definite value, its definite value depends primarily on transformer grounding mode and its zero sequence impedance.Thus system is protected formed by
Relaying configuration exactly required by system.It is as follows that ground connection becomes zero-sequence current result of calculation：
It is far smaller than grounding transformer zero sequence in view of electric power system bus bar impedance and faulty line positive sequence, zero sequence impedance value
Impedance and neutral resistance, can consider as the following formula during simple and practical calculating：If per unit value is calculated：
I(1)0:System single-phase earth fault zero-sequence current
X1∑:Trouble point integrates positive sequence impedance
X2∑:Trouble point integrates negative sequence impedance
X0∑:Trouble point integrates 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
Calculated according to perunit value：
Simultaneously netting twine does not have longitudinal differential protection to 2.3 grid-connected DG system sides
In Practical Project, for this DG through inverter access system of photovoltaic, its ability for providing short circuit current flow has
Limit, therefore load processing still can be regarded as, simply need protection to coordinate with automatics and complete fault disconnection function.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 figures.Wherein MV/LV transformer stations use for internal cavity quality, therein 01,02 is
Disconnecting link, wherein tripping operation connection is cut and netting twine L1 functions, it is to cut function by 03 switch trip connection to realize.At the initial stage of design.This transformer station
It is considered as end stations, therefore, protection device is configured without in transformer substation side switch (03,04).Two main transformers are grounded through discharging gap,
The master one of inlet wire one is standby, using standby throwing mode.
But when DG accesses transformer station, relaying configuration is undesirable, is analyzed more than, to realize that the quick of failure cuts
Except, it is necessary to which to failure using fault disconnection design, following two approach can be passed through：1. standby Union Switch Device of throwing uses inspection frequency certainly
Dynamic coincidence system, standby throwing jumps into the startup connection of wiretap 03 and cuts the grid-connected wiretap PD1 of DG；2. transformer gap overvoltage protection,
During tripping 03, connection cuts grid-connected wiretap PD1.Specific protection scheme is as shown in Figure 9.
The present invention is directed to the grid-connected situations of DG under Thief zone degree, according to when grid-connected DG properties, synchronizing mode, failure whether
Using decoupled mode and the relaying configuration of corresponding system side, give with targetedly, ensure system reliability service
The protection scheme of opening is not lost again.This flexibility, can the strong protection scheme of admissibility, can not only ensure the peace of system
Full reliability service, also can at utmost ensure the interests of DG operators, realize doulbe-sides' victory truly.
It is specific simulation result below.
A wind field based on PSCAD and pessimistic concurrency control, since it is considered that 110kV earthing modes, use here to be grid-connected
The mode of high voltage side of transformer ground connection；Transformer is through low-impedance earthed system in wind field.Figure 10 provides each side zero-sequence current data.
Note：V0h- breaker high-pressure side residual voltage (kV)
V0- breaker low-pressure side residual voltage (kV)
I0CB9- flow through CB9 zero-sequence currents (A)
I0CB7- flow through CB7 zero-sequence currents (A)
Failure situations：
(1) line fault where CB7, transformer triangle side non-zero-sequence current, and there is earth point in circuit where CB9,
Zero-sequence current formation path, CB7, CB9 flow through zero-sequence current.Emulate shown in below figure 11 (a).
(2) bus-bar fault, flows through CB9 electric current.Emulate shown in below figure 11 (b).
(3) high-pressure side is broken down (wiring of Y/ Δs), and the transformer both sides equal non-zero-sequence current of winding passes through.Emulate below figure
Shown in 11 (c).
(4) (wiring of Y/ Δs) trouble point is broken down at the bus1 of CB1 upstreams in high-pressure side.The residual voltage that failure is produced adds
In high-pressure side, zero-sequence current forms loop with clicking and entering by neutrality, and induced in low pressure delta windings three it is equal in magnitude,
Phase identical electromotive force, zero-sequence current only forms loop in delta windings, will not flow on the circuit outside winding, therefore low
Line ball road is without residual voltage.
The present embodiment requirement that power system is protected to it when distributed generator (DG) is grid-connected through discussion, and failure
DG grid-connected methods again, with reference to the typical attempts in a large amount of engineering practices, give power system and face Thief zone after tripping operation
Conservative management scheme during property DG.This principle is using the protection device and automatic safety device of management and control grid entry point (PCC points) as incision
Point, after the factors such as DG properties, synchronizing mode, failure operation mode are taken into full account, before power grid security reliability service is ensured
Put, take into full account the interests of DG operators, establish the protection scheme that a management principle is clear, have high containment to DG.
In the present invention, it is considered to DG from the specified point of power system (distribution and middle pressure transmission system) it is grid-connected when protect and open
The incomplete situation of configuration is closed, the upgrading scheme of a set of protection automatics suitable for special circumstances has been formulated.This is former
Then the effective solution of complete set is provided for Electric Design and relay protection engineering staff.
Although above-mentioned the embodiment of the present invention is described with reference to accompanying drawing, not to present invention protection model
The limitation enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art are not
Need to pay various modifications or deform still within protection scope of the present invention that creative work can make.
Claims (3)
1. based on the high containment guard method of DG interconnected electric power systems, it is characterized in that, including：During line failure, according to simultaneously
Simultaneously whether netting twine installs longitudinal differential protection additional to carry out corresponding protection act net DG system sides；
Simultaneously netting twine installs longitudinal differential protection additional to grid-connected DG system sides, when line failure, route protection action tripping circuit
System side breaker, connection cuts grid-connected wiretap；
Simultaneously netting twine does not have longitudinal differential protection to grid-connected DG system sides, when line failure, route protection action tripping circuit
System side breaker, the over-pressed tripping high voltage side of transformer switch in parallel of the high standby zero sequence of main transformer cuts the grid-connected wiretaps of DG；
Simultaneously netting twine installs longitudinal differential protection additional to grid-connected DG system sides, when line failure, if unplanned property isolated island,
The switch that so grid-connected DG systems are connected with substation bus bar is overlapped using checkout voltage；
Simultaneously netting twine installs longitudinal differential protection additional to grid-connected DG system sides, when line failure, if planned isolated island, and
DG system configuration circuit PT are netted, are overlapped using the inspection same period；
When grid-connected DG system sides and netting twine do not have longitudinal differential protection, transformer mesolow side fanout operation；
When grid-connected DG system sides and netting twine do not have longitudinal differential protection, high pressure inlet wire is standby to be thrown after system side switches tripping, through frequency
Rate rate of change starts standby throwing, and the grid-connected wiretaps of DG are cut in tripping high side switch parallel connection；
When grid-connected DG system sides and netting twine do not have longitudinal differential protection, the high and low side neutral point for transformer of surfing the Net through gap ground,
Zero sequence overvoltage action tripping main transformer both sides switch in parallel cuts the grid-connected wiretaps of DG.
2. the high containment guard method of DG interconnected electric power systems is based on as described in claim 1, it is characterized in that, event occurs for main transformer
All it is that main transformer protection action tripping transformer is high no matter simultaneously whether netting twine installs longitudinal differential protection additional to grid-connected DG system sides during barrier
The grid-connected wiretaps of DG are cut in downside breaker parallel connection.
3. the high containment guard method of DG interconnected electric power systems is based on as described in claim 1, it is characterized in that, grid-connected DG systems
All it is protection act isolated fault no matter simultaneously whether netting twine installs longitudinal differential protection additional to grid-connected DG system sides when system breaks down
Point, grid-connected DG low-frequency and low-voltages off-the-line, excessively stream quick acting and system sectionalizing, into decoupled mode.
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| CN108023366B (en) * | 2018-01-25 | 2020-03-31 | 南京工程学院 | Method for preventing overvoltage of neutral point of main transformer for high-permeability photovoltaic |
| 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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| 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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