CN109950882A - A kind of small power incorporating into power network guard method - Google Patents
A kind of small power incorporating into power network guard method Download PDFInfo
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- CN109950882A CN109950882A CN201910250148.3A CN201910250148A CN109950882A CN 109950882 A CN109950882 A CN 109950882A CN 201910250148 A CN201910250148 A CN 201910250148A CN 109950882 A CN109950882 A CN 109950882A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
- Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
Abstract
Present disclose provides a kind of small power incorporating into power network guard methods, according to small power incorporating into power network connection mode and it is incorporated to transformer substation voltage grade, configure the line protection scheme and its wavy trajectory, according to the difference of protection scheme movement and the difference of the connection butt formula of small power supply, the difference of combination failure object, determine corresponding low-frequency and low-voltage off-the-line allocation plan, it constitutes and first carries out protection scheme movement, realize failure cutting load, connection is carried out again cuts off-the-line reclosing, low-frequency and low-voltage completes the grid-connected protection act sequence of peak load supply, the disclosure forms one securely and reliably, it is again simultaneously open protection and safety device action scheme.
Description
Technical field
This disclosure relates to a kind of small power incorporating into power network guard method.
Background technique
Only there is provided background technical informations relevant to the disclosure for the statement of this part, it is not necessary to so constitute first skill
Art.
Small power incorporating into power network is forms of electricity generation commonplace at present.With the continuous opening of electricity market, constantly have spontaneous
Property power grid, owner wishes when electric power is abundant can be to grid generation, and opposite electric power lacks Shi Kecong power grid and receives electricity
Energy.Therefore, this small power incorporating into power network enterprise based on synchronous machine property, capacity is generally large, is strong support to power grid.
But bring security risk is also significant simultaneously: if the mode that connection of not taking the initiative is cut, it is possible to influence electric system
Reclosing success rate.Comparing extreme situation is, when not being very close small power supply meeting when grid-connected again with grid contact
Impact is brought to power grid and in-house facility.Or be possible to will appear the generation of unplanned isolated island, cause power supplied locally electric energy matter
Amount is not high, and then cause low-frequency oscillation etc..Solution to this problem is under the conditions of studying various small power incorporating into power network in detail
Protection act connection cuts small power supply mode, and accurate excision failure is on the one hand realized by the reinforcement of grid-connected protection, on the other hand logical
The combined method for crossing various protection act object Lian Qie small power incorporating into power network switches guarantees maximum network load supply, together
Shi Peihe small power supply low-frequency and low-voltage off-the-line scheme allows conditional decoupled mode to exist.
Original protection is using equipment claimed by itself as object, and sightline window is also limited to this equipment, as
Reclosing is unsuccessful, the unsuccessful range that is not it and can consider of load restoration, therefore protection is easily caused excessively to be isolated from
It restores electricity, except system safety operation, protection act is even more that electric power netting safe running brings the extreme case of hidden danger to send out sometimes
It is raw.
Summary of the invention
The disclosure to solve the above-mentioned problems, proposes a kind of small power incorporating into power network guard method, and the disclosure is protected by reinforcing
Shield configuration, different protection acts combine different shunt tripping small power incorporating into power network switch solutions, cooperate low-frequency and low-voltage off-the-line scheme, shape
It is safe and reliable at one, while being open protection and safety device action scheme again.Meanwhile the disclosure will act level sky
Between on be divided into failure cutting load, connection cut small power incorporating into power network switch, three levels of low frequency and low pressure cutting load, complete protection optimization
Function.
According to some embodiments, the disclosure is adopted the following technical scheme that
A kind of small power incorporating into power network guard method, comprising the following steps:
According to small power incorporating into power network connection mode and it is incorporated to transformer substation voltage grade, configure the line protection scheme and its tripping side
Formula determines phase according to the difference of protection scheme movement and the difference of the connection butt formula of small power supply, the difference of combination failure object
The low-frequency and low-voltage off-the-line allocation plan answered constitutes and first carries out protection scheme movement, realizes failure cutting load, then carries out connection and cut off-the-line
Reclosing, low-frequency and low-voltage complete the grid-connected protection act sequence of peak load supply.
Limited as further, small power supply plant stand through special line in 220kV substation, when low-pressure side is grid-connected, small power supply
Generator, the tranformer protection of plant stand are configured using differential protection and back-up protection, and 110kV route protection configures longitudinal differential and protects
Shield and three sections of phase spacings, three sections of ground distances, four sections of zero-sequence over-current protections；35kV route protection configure longitudinal differential protection and
Three-stage directional current protection or longitudinal differential protection and three sections of distance protections, interconnection use off-the-line reclosing, i.e. interconnection
Main system power side puts into three-phase checkout voltage reclosing, and small power supply side deactivates reclosing.
Limited as further, small power supply plant stand through T link in 220kV substation, when low-pressure side is grid-connected, small electricity
Generator, tranformer protection configuration differential protection and the back-up protection of source plant stand, 110kV route protection three end longitudinal differentials of configuration
Protection and three sections of phase spacings, three sections of ground distances, four sections of zero-sequence over-current protections；35kV route protection configures three side longitudinal differentials
Protection and three-stage directional current protection or three side longitudinal differential protections and three sections of distance protections, the protection of connection line load station side is only
It acts in signal；Interconnection main system power side uses off-the-line reclosing, i.e. interconnection main system power side investment three-phase examines nothing
Ballast closes a floodgate, and small power supply side deactivates reclosing.
Limited as further, small power supply plant stand through special line when 110kV, 35kV substation mesolow side are grid-connected, it is small
Generator, tranformer protection configuration differential protection and the back-up protection of power supply plant stand；110kV interconnection configures longitudinal differential protection
And three sections of phase spacings, three sections of ground distances, four sections of zero-sequence over-current protections；35kV route protection configures longitudinal differential protection and three
Segmentation directional current protection or longitudinal differential protection and three sections of distance protections；10kV route protection preferably configure longitudinal differential protection and
Three sections of directional current protections.
It is limited as further, 35kV, 10kV small power incorporating into power network line configure low-frequency and low-voltage disconnection device, are used for principal series
Unite failure when and system sectionalizing.
The interconnection main system power side 35kV or 10kV uses off-the-line reclosing, i.e. interconnection main system power side investment three
Phase checkout voltage reclosing, small power supply side deactivate reclosing；The route main system power side upper level 110kV uses off-the-line reclosing,
The route main system power side 110kV puts into three-phase checkout voltage reclosing, and the 110kV transformer substation side of small power incorporating into power network, which deactivates, to be overlapped
Lock.
It is limited as further, for the major network one-end substation of heavy current grounding system, transformer zero sequence overcurrent is protected
It protects the first time limit connection and cuts the regional small power incorporating into power network point of jump, the second time limit jumped each side of depressor；
For the major network one-end substation of heavy current grounding system, transformer installs residual voltage and clearance zero sequence protection solution for the current
Array apparatus jumps the breaker of regional power networking lines；
For the small current neutral grounding system of resistance grounded, regional power side transformer should install residual voltage and zero sequence electricity
Disconnection device is flowed, operating time of protection and the side all devices zero stream protection have the protection section of enough sensitivity coefficients to cooperate, jump ground
Area's power transformer side breaker；
In ground fault, this side of transformer is matched with all outlet zero-sequenceprotections, that is, has the protection of zero sequence degree to be intended to match
It closes, as back-up protection delay this side small power incorporating into power network of tripping switch.
It is limited as further, small power supply plant stand is grid-connected in public 110kV, 35kV substation medium voltage side through T link
When, generator, tranformer protection configuration differential protection and the back-up protection of small power supply plant stand；The vertical connection of 110kV interconnection configuration is poor
Dynamic protection and three sections of phase spacings, three sections of ground distances, four sections of zero-sequence over-current protections；The movement of 110kV transformer substation side route protection
It jumps 35kV and gets in touch with wiretap；35kV route protection configures three side longitudinal differential protections and three-stage directional current protection or three sides are vertical
Linked differential protection and three sections of distance protections；T link load side switch motion is in signal；And 35kV small power incorporating into power network line is with setting low
Frequency low pressure disconnection device.
It is limited as further, when the configuration of off-the-line reclosing is arranged, power supply low-frequency and low-voltage disconnection device definite value and electricity
The basic wheel end wheel definite value of net matches, should not before grid disconnection leading off-the-line.
Compared with prior art, the disclosure has the beneficial effect that
The disclosure combines different shunt tripping small power incorporating into power network switch sides by reinforcing relaying configuration, different protection acts
Case cooperates low-frequency and low-voltage off-the-line scheme, it is safe and reliable to form one, while being open protection and safety device movement side again
Case.Failure cutting load will be divided on movement hierarchical space, connection cuts three small power incorporating into power network switch, low frequency and low pressure cutting load layers
The optimization function of protection is completed in face.
The disclosure considers different faults object, needs connection to cut small power supply under different protection act and wavy trajectory, then examine
Consider the mode object of its corresponding off-the-line reclosing, and then consider the configuration and off-the-line scheme of last low-frequency and low-voltage disconnection device,
Fault object is quickly cut off after realizing most effective guarantee failure, while off-the-line reclosing is cut by connection, low-frequency and low-voltage is completed most
The reliable supply of big load.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present application, and the application's shows
Meaning property embodiment and its explanation are not constituted an undue limitation on the present application for explaining the application.
Fig. 1 is the protection of the present embodiment and pacifies from device action scheme cooperation schematic diagram；
Fig. 2 is the protection and off-the-line forecast scheme configuration factor analysis figure of the present embodiment；
Fig. 3 be the present embodiment small power supply plant stand through special line in 220kV substation, the grid-connected schematic diagram of low-pressure side；
Fig. 4 be the present embodiment small power supply plant stand through T link in the grid-connected schematic diagram of 220kV substation medium voltage side；
Fig. 5 be the present embodiment small power supply plant stand through special line in the grid-connected signal in public 110kV, 35kV substation mesolow side
Figure；
Fig. 6 is that the small power supply plant stand of the present embodiment is shown through T link in public 110kV, 35kV substation medium voltage side is grid-connected
It is intended to；
Fig. 7 is the three lines of defence action timing diagram of the present embodiment；
Fig. 8 be the present embodiment different earthing modes under transformer connection once scheme；
Fig. 9 (a)-(c) be the present embodiment different earthing modes under relaying configuration subdivision graph；
Transformer is directly grounded failure zero-sequence network figure when Figure 10 is the ground fault of the present embodiment；
Figure 11 is this area distributed generation resource and locality balancing the load situation of the present embodiment；
Figure 12 is the accidental conditions wiring diagram of the present embodiment；
Figure 13 is the protection scheme movement load dividing regions schematic diagram of the present embodiment.
Specific embodiment:
The disclosure is described further with embodiment with reference to the accompanying drawing.
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms that the present embodiment uses have and the application person of an ordinary skill in the technical field
Normally understood identical meanings.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
In the disclosure, term for example "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", " side ",
The orientation or positional relationship of the instructions such as "bottom" is to be based on the orientation or positional relationship shown in the drawings, only to facilitate describing this public affairs
The relative for opening each component or component structure relationship and determination, not refers in particular to either component or element in the disclosure, cannot understand
For the limitation to the disclosure.
In the disclosure, term such as " affixed ", " connected ", " connection " be shall be understood in a broad sense, and indicate may be a fixed connection,
It is also possible to be integrally connected or is detachably connected；It can be directly connected, it can also be indirectly connected through an intermediary.For
The related scientific research of this field or technical staff can determine the concrete meaning of above-mentioned term in the disclosure as the case may be,
It should not be understood as the limitation to the disclosure.
As described in the background art, protection is using equipment claimed by itself as object, and sightline window is also office
It is limited to this equipment, the load restoration unsuccessful range that is not it can consider unsuccessful as reclosing, therefore easily cause
Protection is excessively isolated from and restores electricity, except system safety operation, and protection act is even more that be that electric power netting safe running is brought hidden sometimes
The extreme case of trouble occurs.Existing wide area protection attempts to solve the problems, such as this from the mode for reinforcing information collection range, but
It is for existing protective device on site, relay protection is still most may be used as the first line of defence, first time isolated fault
By the economic practice, only when protection scheme and peace are from scheme cooperation, it will need to consider that background adds, be only current ratio
The more economical practical practice.
The main purpose of relay protection is to protect the safety of this device object, but its movement setting is to following needs system
Safe and stable operation influences very big.If the background of setting mismatches, it will cause subsequent peace that can not make up from device action
Consequence.Because being the control of reaction type mode for the protection philosophy of power equipment, i.e., set according to tune in advance
Action logic is acted, and is then the control of feed-forward mode for system stable operation.If event and background are estimated and real
Border event matches with scene, the requirement of the two and Lothrus apterus.If event mismatch, subsequent defence line be also unable to complete after
Electric protection requires the event made, therefore requires mutually to conflict with electric power netting safe running, it is therefore desirable to the guarantor of both one coordinating and unifying
Shield acts the coordinate scheme between shunt tripping, cutting load device, as shown in Figure 1.
The present embodiment is proposed based on reinforced protection small power incorporating into power network protection side integrated with low-frequency and low-voltage off-the-line scheme
Case, by reinforcing relaying configuration, different protection acts combines different shunt tripping small power incorporating into power network switch solutions, and cooperation low frequency is low
Off-the-line scheme is pressed, it is safe and reliable to form one, while being open protection and safety device action scheme again.Level will be acted
It is spatially divided into failure cutting load, joins and cuts three small power incorporating into power network switch, low frequency and low pressure cutting load levels, completes the excellent of protection
Change function.
If careful decomposing protection scheme, is to need to consider different faults object, different protection acts, and tripping
Connection is needed to cut small power supply under mode.Then what is considered is the mode object of its corresponding off-the-line reclosing, and is finally to need to examine
What is considered is the configuration and off-the-line scheme of last low-frequency and low-voltage disconnection device.Purpose final in this way is most effective guarantee failure
Fault object is quickly cut off afterwards, while off-the-line reclosing is cut by connection, and low-frequency and low-voltage completes the reliable supply of peak load.Specifically
As shown in Figure 2.
The protection scheme specifically formed mainly includes following several:
(1) as shown in figure 3, small power supply plant stand through special line in 220kV substation, low-pressure side it is grid-connected protection and reclosing side
Case
Defencive function configuration:
As shown in figure 3, small power supply plant stand through special line in 220kV substation, low-pressure side it is grid-connected, the power generation of small power supply plant stand
Conventional configuration (differential protection and back-up protection) can be used in machine, tranformer protection；Consider by nearly standby principle, 110kV route is protected
Shield configuration longitudinal differential protection and three sections of phase spacings, three sections of ground distances, four sections of zero-sequence over-current protections.35kV route protection is matched
Set longitudinal differential protection and three-stage directional current protection or longitudinal differential protection and three sections of distance protections.Interconnection uses off-the-line
Reclosing, i.e. interconnection main system power side put into three-phase checkout voltage reclosing, and small power supply side deactivates reclosing.
(2) small power supply plant stand is through T link in the grid-connected protection scheme of 220kV substation medium voltage side
Applicable defencive function configuration:
As shown in figure 4, small power supply plant stand through T link in 220kV substation, low-pressure side it is grid-connected, small power supply plant stand
Conventional configuration (differential protection and back-up protection) can be used in generator, tranformer protection；Consider by nearly standby principle, 110kV line
The three end longitudinal differential protection of road relaying configuration and three sections of phase spacings, three sections of ground distances, four sections of zero-sequence over-current protections.35kV line
The three side longitudinal differential protection of road relaying configuration and three-stage directional current protection or three side longitudinal differential protections and three sections of distances are protected
Shield, connection line load station side (03 switch) protection are only acted in signal.Interconnection main system power side uses off-the-line reclosing, i.e.,
Interconnection main system power side puts into three-phase checkout voltage reclosing, and small power supply side deactivates reclosing.
Low-frequency and low-voltage off-the-line definite value takes turns definite value lower than low-frequency and low-voltage cutting load device end.
(3) small power supply plant stand is through special line in 110kV, 35kV substation mesolow side connect-in strategy
As shown in figure 5, small power supply plant stand through special line in public 110kV, 35kV substation mesolow side grid-connected, small power supply factory
Conventional configuration (differential protection and back-up protection) can be used in generator, the tranformer protection stood；The vertical connection of 110kV interconnection configuration is poor
Dynamic protection and three sections of phase spacings, three sections of ground distances, four sections of zero-sequence over-current protections.35kV route protection configures longitudinal differential and protects
Shield and three-stage directional current protection or longitudinal differential protection and three sections of distance protections；10kV route protection preferably configures longitudinal differential
Protection and three sections of directional current protections.
The public station side protection (switch of second station 03) of 110kV interconnection, the public change main transformer ground connection of 110kV and earth-free guarantor
Shield configuration shunt tripping 35kV (10kV) small power incorporating into power network line function, it may be assumed that the public station side protection of 110kV interconnection, high voltage side of transformer
Zero-sequenceprotection (gap and overvoltage protection when earth-free) short duration jumps 35kV (and 10kV) contact wiretap (53 and 23 switch), if
Remote function of jumping realizes difficulty, can jump small power incorporating into power network line source-side switches (503 and 13 switch) nearby.
35kV, 10kV small power incorporating into power network line configure low-frequency and low-voltage disconnection device, be used for main system failure when and system sectionalizing.
The interconnection main system power side 35kV or 10kV uses off-the-line reclosing, i.e. interconnection main system power side investment three
Phase checkout voltage reclosing, small power supply side deactivate reclosing；The route main system power side upper level 110kV uses off-the-line reclosing,
The route main system power side 110kV puts into three-phase checkout voltage reclosing, and the 110kV transformer substation side of small power incorporating into power network, which deactivates, to be overlapped
Lock.
For the major network one-end substation of heavy current grounding system, such as the neutral-point solid ground of transformer, and load side
It is connected to regional power, then the first time limit of transformer zero-sequence over-current protection connection cuts the regional small power incorporating into power network point of jump, the jump of the second time limit
Each side of depressor.
The major network one-end substation of heavy current grounding system, such as the neutral point of transformer are not directly grounded, and load
Regional power is flanked, then transformer should also install residual voltage and clearance zero sequence protection electric current disconnection device, 3 times of residual voltage 3U0
Definite value is generally adjusted as 150V~180V (rated value 300V), definite value of clearance zero sequence protection electric current can generally adjust 40A~
100A, band 0.1s~0.5s is delayed after protection act, jumps the breaker of regional power networking lines.
For the small current neutral grounding system of resistance grounded, regional power side transformer should install residual voltage and zero sequence electricity
Disconnection device is flowed, it is 40V~50V (3U0 is 100V when single-phase earthing), zero sequence electricity that three times residual voltage 3Uo definite value, which is generally adjusted,
Stream definite value has enough sensitivity coefficients to adjust by singlephase earth fault.Operating time of protection, which should flow protection with the side all devices zero, to be had
The protection section cooperation of enough sensitivity coefficients, jumps the regional power transformer side breaker.
(4) small power supply plant stand is through T link in the grid-connected protection scheme in 110kV, 35kV substation mesolow side
As shown in fig. 6, small power supply plant stand is through T wiring and grid-connected, the small electricity in public 110kV, 35kV substation mesolow side
Conventional configuration (differential protection and back-up protection) can be used in generator, the tranformer protection of source plant stand；The configuration of 110kV interconnection is vertical
Linked differential protection and three sections of phase spacings, three sections of ground distances, four sections of zero-sequence over-current protections.110kV transformer substation side (is opened at second station
Close) route protection movement jump 35kV contact wiretap (54 switch).35kV route protection configures three side longitudinal differential protections and three
Segmentation directional current protection or three side longitudinal differential protections and three sections of distance protections；53 switch motion of T link load side is in letter
Number.
The public change main transformer configuration ground connection of 110kV and earth-free protection shunt tripping 35kV (10kV) small power incorporating into power network line function
Can, i.e., (54 open high voltage side of transformer zero-sequenceprotection (gap and overvoltage protection when earth-free) short duration jump 35kV contact wiretap
It closes).
35kV small power incorporating into power network line configure low-frequency and low-voltage disconnection device, be used for main system failure when and system sectionalizing.
Power supply low-frequency and low-voltage disconnection device definite value requires to be that (it is fixed that Load Shedding According To Frequency device takes turns end wheel to 47.5Hz/0.5s substantially
Value be 7.75Hz/0.5s), 70.0%Un/5.0s (it is 75.0%Un/0.5s that low pressure loadshedding equipment take turns last definite value of taking turns substantially).
In the configuration process of above-mentioned protection scheme, for present some small power incorporating into power network protection schemes, since plant stand is protected
Shield configuration is not perfect, cannot achieve the function that 110kV fault of interconnected transmission line even jumps small power incorporating into power network wiretap.To ensure that 110kV joins
After winding thread failure, reclosing can quick acting, take improve low-frequency and low-voltage disconnection device definite value mode, it is low using low frequency
It presses disconnection device by the leading off-the-line of small power supply, has violated the purpose of low-frequency and low-voltage disconnection device installing, be equivalent to utilization " second
Defence line " function replaces the partial function of " the first line of defence ".On the one hand rapidity and with closing it is undesirable, while again
The principle that low-frequency and low-voltage off-the-line is matched with power grid is violated, because being to take turns end wheel substantially as power grid to determine to its basic demand
Value matches, should not before grid disconnection leading off-the-line so that effective support to power grid can not be formed.As shown in Figure 7.
By wherein " small power supply plant stand through special line in public 110kV, 35kV substation mesolow side it is grid-connected for, can from Fig. 8
To find out, small power incorporating into power network channel includes route and transformer is all configured with differential protection, in this way by reinforced protection, is made
The decision-point of failure can accurately decide very much, because only that uniquely determining fault object, could pass through in next step
The serious and degree of expansion of failure and its status in power grid determine the control strategy of next step.For load side, when
When its unique power supply pass element breaks down, on the one hand connects the grid-connected switch of jump and off-the-line reclosing ensures that system
The recovery of side power supply.On the other hand, opening plan isolated island is formed by low frequency, low pressure disconnection device.Why it is called
Style of opening plan isolated island, is because can be according to the i.e. real-time voltage to frequency of current loads situation, in the side 10kV, 35kV at second station
Local load is supplied to by small power supply.But for power grid, what is considered first is distant to cut the grid-connected switch in small power supply opposite side
(23), due to the configuration of longitudinal difference protection, distant function of cutting be may be implemented, and such isolated island may be considered to be born in small power supply supply factory
Lotus.Without distant tangent condition, the grid-connected switch (13) of system side can also be cut off, therefore this isolated island is existed by low-pressure side in second station
Interior larger isolated island.This principle be under the premise of guaranteeing system safe and stable operation, can be according to local load condition
Form isolated island.But the definite value of low-frequency and low-voltage cutting load is system low-frequency and low-voltage when considering the system failure or being abnormal operation
Substantially it moves in turn after the completion of work, and system can not be still restored in the case of stable operation, in order to guarantee that the equipment in small power supply factory is pacified
A versatile person starts epicycle low-frequency low-voltage load shedding, i.e., cannot ignore to the support function of electric system.
Different for transformer grounding mode, system can be divided into small current neutral grounding system and heavy current grounding system.And it is right
In heavy current grounding system, its general transformer mesolow is connected to the transformer of small power incorporating into power network, and usually high-pressure side is neutral
Point is directly grounded, but for relaying configuration, it is also contemplated that being possible to shut down, high-pressure side neutral point isolating switch is pulled open, and is led to
The case where overdischarge gap ground.And for small current neutral grounding system, since its link property is different, it can be divided into and not connect
Ground is grounded through arc suppression coil, and through three kinds of situations of low-impedance earthed system, this is mainly determined by the size of local earthing capacitance current
's.It therefore, be by subdivision, as shown in Fig. 9 (a)-(c) when considering protection act situation.By project plan comparison it is found that when big electricity
When flowing earthed system neutral-point solid ground, zero-sequence over-current protection is divided into II segmentation, the grid-connected switch of the first time limit tripping, be because
To supply power supply as the fault point of zero-sequence current and treat for its low current, due to main transformer high-pressure side zero-sequenceprotection be and this
What the zero-sequence current of the 110KV outlet of side matched, the time limit, also inlet wire matched with this side, can from zero sequence analysis chart
Out, its transformer primary avris is directly grounded in fact for star, and secondary side is corner connection, and zero-sequence network small power supply side is shorted.
But the angle of Ying Guangcong zero sequence net protection is understood when thinking deeply, because small power supply is still for positive sequence network
Fault current is provided to fault point, therefore at the first time disconnects it from transformer, is the first step for guaranteeing the stabilization of power grids and restoring.
And for isolated neutral situation, then by overvoltage and gap overcurrent, disconnect may cause the small of overvoltage at the first time
Power supply is most direct effective measures, is occurred because this is equivalent to failure when having occurred local earth-free.
For small current neutral grounding system, when being grounded by arc suppression coil, single-phase earthing, which is not recalled, belongs to failure, and
Belong to misoperation, therefore does not belong to relaying configuration and range is discussed.And when for resistance grounded, then it needs in ground fault time-varying
This side of depressor is matched with all outlet zero-sequenceprotections, that is, has the protection of zero sequence degree to be intended to cooperate, and is delayed and is jumped as back-up protection
Format side small power incorporating into power network switch.
It is the main small power supply on-position in Zaozhuang area and small power supply as shown in figure 11 as a kind of specific embodiment
With local balancing the load situation, thus figure can formulate corresponding protection connection and cut and the standby throwing integrated programme of low frequency.And this figure can
To provide most intuitive small power supply operating condition analysis for dispatcher, facilitate whether just dispatcher judges protection and automation movement
Really, properly, and be conducive to the recovery of subsequent normal operating mode.This programme is using local small power supply and local balancing the load degree
Energy index works as system jam to characterize, and after connection cutting system online interconnection, local load balances energy beyond small power supply
The severity of power is divided into three grades: yellow region, red color area and green area.These performance indicators are with the method for operation at that time
Lower generator issues what the active and real-time collection value of local load was shown by degree of balance performance indicator.
The power supply mode that Zaozhuang power grid is run using 220kV looped network, 110kV and the radiation of following voltage class, small power supply connect
Enter in radiation network voltage class.110kV and 35kV substation substantially uses a main standby power supply mode, stands interior equipped with for certainly
Throwing and low frequency, low-voltage load sheding device.
(see Figure 11) by taking protection act behavior when Zaozhuang electric system Nei Jia power plant surfs the Internet line fault as an example, explanation is based on
Protection connection is cut dynamic when there is small power supply access to break down with the standby protection for throwing integrated programme use of low frequency and automation equipment
Make behavior.
The method of operation is as follows: first power plant is surfed the Internet by A-wire, 101 switches, 111 switch operations, the ribbon second power transformation of first power plant
It stands, 102 switches, 03 switch operation, the third power plant is surfed the Internet by WL1 line by second substation, 11 switch operations；Second substation 04 opens
Stand-by heat is closed, C-wire is as siding.
The protection definite value and matching relationship that A-wire 111 is protected are as follows:
The protection definite value and matching relationship that second line 109 is protected are as follows:
The standby throwing definite value in second station is as follows:
It is that trip protection connection cuts 102 switching functions, and the spare power at second station can by definite value that 101 protections of A-wire, which use,
Know, being not required to cooperation directly can throw function through differential delay (0.3S) realization of a time is standby under the conditions of meeting standby throw.
Relaying configuration before scheme is implemented: all route protections match positive routine three-stage direction distance and zero sequence overcurrent is protected
Shield；The switch of A-wire 111,101 switch investment protection reclosing functions.Second substation puts into backup power automatic switching function.
When permanent earth fault occurs for the grid-connected interconnection A-wire of power plant, acted from the closer switch protection in fault point,
Since unbalanced fault mutually fast protection function is put into, opposite side switch protection is also moved at the same time, and cuts off fault point.At this point, first power plant
Single tape second transformer substation system side balancing the load performance indicator corresponds to red color area, and second substation sheet is as green area.At this point, 111
Switch protection checkout voltage is overlapped, and 101 switch protection of first Power Plant Side examines same period starting failure；First power plant single tape second substation operation,
Since second substation load is heavier, first power plant low frequency cuts machine.Second substation isolated operation, interior low-frequency and low-voltage device starting of standing, cuts
Except a part of load, reach electric quantity balancing in isolated island.Above process Zhong Jia factory power loss, second substation are difficult to ensure power supply quality,
And it is possible to face adjustment generator grid-connected problem synchronous with system.
Therefore, to shorten power off time, electric quantity loss is reduced, using integrated programme.
When single tape second substation, first power plant balancing the load performance indicator corresponds to red color area, and second substation sheet is as yellow
Qu Shi, using following scheme:
(1) increase first power plant 101 and switch 102 switching circuitry of shunt tripping；
(2) second substation (low frequency) prepared auto restart starting connection is added and cuts 11 switching function of the third power plant.
(3) protection reclosing in A-wire two sides deactivates.
Failure is same as above: due to 101 switch 102 switching function of shunt tripping investment in factory, first power plant, 102 switch trippings: first power plant
Machine is cut in the movement of generator underfrequency protection, and (because first power plant load balance quality index corresponds to red color area, second substation is yellow
Area)；Second line route reduces (df/dt > setting valve) without pressure, without stream (no longer sentencing bus without pressure), frequency, meets (low frequency) prepared auto restart
Operation condition；Second transformer substation spare power automatic switching (connection is cut) movement, the switch of tripping 03 close 04 switch, and the third power plant 11 of excision switchs, at this time
Second substation load shifts rapidly is powered by C-wire.
Figure 13 is the corresponding balancing the load schematic diagram of three kinds of schemes after failure occurs:
(1) standby throw to the station Xue Cheng in the station Lin Shan is powered, and balancing the load performance indicator corresponds to the area c, and the station Lin Shan is the area a.Movement
Behavior and treatment process are as described in scheme one.
To sum up, the first line of defence of the relay protection as electric system, protection act after a failure, belong to closed-loop control,
Using Feedback Control Law.And subsequent reclosing, prepared auto restart and low frequency, low pressure cutting load automatic device its protect matching for definite value
Close is to complete a whole set of protection act, Fault Isolation and load restoration work using off-line calculation mode with cooperation.But
Protection is used as a complete closed-loop system, and major function is to protect equipment, and cutting off this protection scope internal fault is target, but
Be it is specific whether can completely isolated failure, complete maximum load restoration, then significant portion depends on peace from device, also
The logic background of protection act, if this background set is wrong, not only protection act cannot complete Fault Isolation work well
Make, and be possible to that security risk can be left, leads to the misoperation of power grid, jeopardize power grid security when serious.And as small electricity
The considerations of situation, is accessed in source, is exactly one of them.The relaying configuration under various small power supply accesses should be discussed in detail in the present embodiment
And low-frequency and low-voltage off-the-line scheme, fundamentally solve the problems, such as this.
The foregoing is merely preferred embodiment of the present application, are not intended to limit this application, for the skill of this field
For art personnel, various changes and changes are possible in this application.Within the spirit and principles of this application, made any to repair
Change, equivalent replacement, improvement etc., should be included within the scope of protection of this application.
Although above-mentioned be described in conjunction with specific embodiment of the attached drawing to the disclosure, model not is protected to the disclosure
The limitation enclosed, those skilled in the art should understand that, on the basis of the technical solution of the disclosure, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within the protection scope of the disclosure.
Claims (10)
1. a kind of small power incorporating into power network guard method, it is characterized in that: the following steps are included:
According to small power incorporating into power network connection mode and it is incorporated to transformer substation voltage grade, configure the line protection scheme and its wavy trajectory,
It is determined corresponding according to the difference of protection scheme movement and the difference of the connection butt formula of small power supply, the difference of combination failure object
Low-frequency and low-voltage off-the-line allocation plan, constitute first carry out protection scheme movement, realize failure cutting load, then carry out connection cut off-the-line weight
It closes a floodgate, low-frequency and low-voltage completes the grid-connected protection act sequence of peak load supply.
2. a kind of small power incorporating into power network guard method as described in claim 1, it is characterized in that: small power supply plant stand through special line in
In 220kV substation, when low-pressure side is grid-connected, generator, the tranformer protection of small power supply plant stand are protected using differential protection and standby
Shield configuration, 110kV route protection configure longitudinal differential protection and three sections of phase spacings, three sections of ground distances, four sections of zero sequence overcurrents
Protection；35kV route protection configures longitudinal differential protection and three-stage directional current protection or longitudinal differential protection and three sections of distances
Protection, interconnection use off-the-line reclosing, i.e. interconnection main system power side puts into three-phase checkout voltage reclosing, and small power supply side is stopped
Use reclosing.
3. a kind of small power incorporating into power network guard method as described in claim 1, it is characterized in that: small power supply plant stand through T link in
In 220kV substation, when low-pressure side is grid-connected, generator, tranformer protection configuration differential protection and the standby of small power supply plant stand are protected
Shield, 110kV route protection configure three end longitudinal differential protections and three sections of phase spacings, three sections of ground distances, four sections of zero sequence overcurrents
Protection；35kV route protection configure three side longitudinal differential protections and three-stage directional current protection or three side longitudinal differential protections and
Three sections of distance protections, the protection of connection line load station side are only acted in signal；Interconnection main system power side uses off-the-line reclosing,
I.e. interconnection main system power side puts into three-phase checkout voltage reclosing, and small power supply side deactivates reclosing.
4. a kind of small power incorporating into power network guard method as described in claim 1, it is characterized in that: small power supply plant stand through special line in
When 110kV, 35kV substation mesolow side are grid-connected, the generator of small power supply plant stand, tranformer protection configuration differential protection and after
Standby protection；110kV interconnection configures longitudinal differential protection and three sections of phase spacings, three sections of ground distances, four sections of zero sequence overcurrents are protected
Shield；35kV route protection configures longitudinal differential protection and three-stage directional current protection or longitudinal differential protection and three sections of distances are protected
Shield；10kV route protection preferably configures longitudinal differential protection and three sections of directional current protections.
5. a kind of small power incorporating into power network guard method as claimed in claim 4, it is characterized in that: 35kV, 10kV small power incorporating into power network line
Configure low-frequency and low-voltage disconnection device, be used for main system failure when and system sectionalizing.
6. a kind of small power incorporating into power network guard method as described in claim 1, it is characterized in that: 35kV or 10kV interconnection main system
Source side uses off-the-line reclosing, i.e. interconnection main system power side puts into three-phase checkout voltage reclosing, and small power supply side deactivates weight
It closes a floodgate；The route main system power side upper level 110kV uses off-the-line reclosing, and the route main system power side 110kV puts into three-phase
The 110kV transformer substation side of checkout voltage reclosing, small power incorporating into power network deactivates reclosing.
7. a kind of small power incorporating into power network guard method as described in claim 1, it is characterized in that: for the master of heavy current grounding system
Network termination substation, the first time limit of transformer zero-sequence over-current protection connection cut the regional small power incorporating into power network point of jump, the second time limit jump pressure
Each side of device；
Or/and the major network one-end substation for heavy current grounding system, transformer install residual voltage and clearance zero sequence protection electric current
Disconnection device jumps the breaker of regional power networking lines.
8. a kind of small power incorporating into power network guard method as described in claim 1, it is characterized in that: for the low current of resistance grounded
Earthed system, regional power side transformer should install residual voltage and zero-sequence current disconnection device, operating time of protection and the side
The stream protection of all devices zero has the protection section of enough sensitivity coefficients to cooperate, and jumps the regional power transformer side breaker；
Or/and in ground fault, this side of transformer is matched with all outlet zero-sequenceprotections, that is, has the protection of zero sequence degree to be intended to
Cooperation, as back-up protection delay this side small power incorporating into power network of tripping switch.
9. a kind of small power incorporating into power network guard method as described in claim 1, it is characterized in that: small power supply plant stand through T link in
When public 110kV, 35kV substation medium voltage side is grid-connected, the generator of small power supply plant stand, tranformer protection configuration differential protection and
Back-up protection；110kV interconnection configures longitudinal differential protection and three sections of phase spacings, three sections of ground distances, four sections of zero sequence overcurrents
Protection；The movement of 110kV transformer substation side route protection jumps 35kV and gets in touch with wiretap；35kV route protection configures three side longitudinal differentials and protects
Shield and three-stage directional current protection or three side longitudinal differential protections and three sections of distance protections；T link load side switch motion
In signal；And 35kV small power incorporating into power network line configures low-frequency and low-voltage disconnection device.
10. a kind of small power incorporating into power network guard method as described in claim 1 is being set it is characterized in that: limiting as further
When setting the configuration of off-the-line reclosing, power supply low-frequency and low-voltage disconnection device definite value take turns last definite value of taking turns substantially with power grid and is matched, should not be
Leading off-the-line before grid disconnection.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110994543A (en) * | 2019-12-10 | 2020-04-10 | 广东电网有限责任公司 | Automatic reclosing method of bilateral power circuit with local power supply |
| CN111600281A (en) * | 2020-03-31 | 2020-08-28 | 国网上海市电力公司 | Method for cutting off small power supply of power distribution network |
| CN113964801A (en) * | 2021-10-13 | 2022-01-21 | 南京南瑞继保电气有限公司 | Distance protection optimization method and device for high-voltage line protection device |
| CN114389369A (en) * | 2022-03-23 | 2022-04-22 | 广东承能电力安装有限公司 | Intelligent monitoring system and method for electric room load |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101771278A (en) * | 2010-01-27 | 2010-07-07 | 中国华电工程(集团)有限公司 | Method for power network splitting and load shedding |
| CN101873007A (en) * | 2010-06-28 | 2010-10-27 | 北京四方继保自动化股份有限公司 | Micro-grid relay protection and automation integrated intelligent protection system |
| CN103248055A (en) * | 2013-05-13 | 2013-08-14 | 南京南瑞集团公司 | Method for solving accurate selecting and changing of generator and load after regional power grid splitting |
| CN103944160A (en) * | 2014-04-09 | 2014-07-23 | 国家电网公司 | Distribution network protection and automatic device cooperating method based on DG characteristics |
| CN105162086A (en) * | 2015-09-11 | 2015-12-16 | 国家电网公司 | Protection method for DG grid-connected transformer grounding system |
| CN106410766A (en) * | 2016-11-11 | 2017-02-15 | 国网山东省电力公司枣庄供电公司 | DG grid-connected electric system high acceptance protection method |
| CN108808832A (en) * | 2018-06-14 | 2018-11-13 | 国网山西省电力公司忻州供电公司 | A kind of band small power supply access system prepared auto restart application enhancements method |
-
2019
- 2019-03-29 CN CN201910250148.3A patent/CN109950882B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101771278A (en) * | 2010-01-27 | 2010-07-07 | 中国华电工程(集团)有限公司 | Method for power network splitting and load shedding |
| CN101873007A (en) * | 2010-06-28 | 2010-10-27 | 北京四方继保自动化股份有限公司 | Micro-grid relay protection and automation integrated intelligent protection system |
| CN103248055A (en) * | 2013-05-13 | 2013-08-14 | 南京南瑞集团公司 | Method for solving accurate selecting and changing of generator and load after regional power grid splitting |
| CN103944160A (en) * | 2014-04-09 | 2014-07-23 | 国家电网公司 | Distribution network protection and automatic device cooperating method based on DG characteristics |
| CN105162086A (en) * | 2015-09-11 | 2015-12-16 | 国家电网公司 | Protection method for DG grid-connected transformer grounding system |
| CN106410766A (en) * | 2016-11-11 | 2017-02-15 | 国网山东省电力公司枣庄供电公司 | DG grid-connected electric system high acceptance protection method |
| CN108808832A (en) * | 2018-06-14 | 2018-11-13 | 国网山西省电力公司忻州供电公司 | A kind of band small power supply access system prepared auto restart application enhancements method |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110994543A (en) * | 2019-12-10 | 2020-04-10 | 广东电网有限责任公司 | Automatic reclosing method of bilateral power circuit with local power supply |
| CN111600281A (en) * | 2020-03-31 | 2020-08-28 | 国网上海市电力公司 | Method for cutting off small power supply of power distribution network |
| CN111600281B (en) * | 2020-03-31 | 2022-03-29 | 国网上海市电力公司 | Method for cutting off small power supply of power distribution network |
| CN113964801A (en) * | 2021-10-13 | 2022-01-21 | 南京南瑞继保电气有限公司 | Distance protection optimization method and device for high-voltage line protection device |
| CN114389369A (en) * | 2022-03-23 | 2022-04-22 | 广东承能电力安装有限公司 | Intelligent monitoring system and method for electric room load |
| CN114389369B (en) * | 2022-03-23 | 2022-07-05 | 广东承能电力安装有限公司 | Intelligent monitoring system and method for electric room load |
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