CN106786419B - Wind power plant based on station domain protection philosophy collects system relay protection method - Google Patents
Wind power plant based on station domain protection philosophy collects system relay protection method Download PDFInfo
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- CN106786419B CN106786419B CN201611192814.5A CN201611192814A CN106786419B CN 106786419 B CN106786419 B CN 106786419B CN 201611192814 A CN201611192814 A CN 201611192814A CN 106786419 B CN106786419 B CN 106786419B
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- feeder line
- mutual inductor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—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 involving signal transmission between at least two stations
- H02H7/263—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 involving signal transmission between at least two stations involving transmissions of measured values
Abstract
The invention discloses a kind of wind power plants based on station domain protection philosophy to collect system relay protection method, including：Identical protective relaying device is installed respectively respectively collecting feeder line exit, ground connection change side and main transformer low-pressure side; every set protective relaying device follows IEC61850 specification and is communicated, and the electric quantity information that its internal electron formula mutual inductor measures is sent to station level decision center；Fault type is determined according to the size relation between each electric quantity information by station level decision center, enables corresponding station domain protection mechanism further according to fault type.This method has fully taken into account the fault characteristic of blower complexity and the topological structure that wind power plant is special; by carrying out fault distinguishing using the collected multiterminal information content of electronic mutual inductor; the station domain protection new principle of construction has preferable selectivity and quick-action, the wind-power electricity generation station suitable for various types different capabilities size.
Description
Technical field
Collect the present invention relates to technical field of relay protection more particularly to a kind of wind power plant based on station domain protection philosophy and is
System relay protecting method.
Background technique
Under the background of wind-powered electricity generation extensive development, the wind-powered electricity generation scale with access power grid constantly expands, the failure of wind power plant
Characteristic brings a series of new challenges to the safe and stable operation of electric system.Especially ensureing power grid and wind power plant safety
In the protection control measure problem of operation, influence of the wind power plant for electric system is increasingly enhanced, and wind power plant is considered as by tradition
The processing mode for imitating load is no longer applicable in.Since blower is different from the short circuit curve of normal power supplies, research meets selectivity, can
Wind field protection by property, rapidity, sensitivity is of great significance to the stable operation etc. of wind power plant and electric system.
Wind power plant collects system using traditional relay protection at present, carries out fault distinguishing using single-end information amount.Collecting
Differential current protection is configured on bus, and two-part current protection and zero sequence excess current protection are configured on collecting feeder line.However by
Power electronic devices is installed in wind-driven generator and uses complicated control strategy, its fault characteristic and conventional synchronization is caused to generate electricity
Machine is significantly different, while the special topological structure of wind power plant is also that relay protection correctly acts and brings challenge.As wind-powered electricity generation enters
Net ratio is continuously increased, and wind power plant collects system conventional protective device, and the problem of tripping is with malfunction occur increasingly prominent, therefore needle
It is of great significance to the system protection new principle of collecting of wind power plant research better adaptability.
Summary of the invention
The object of the present invention is to provide a kind of wind power plants based on station domain protection philosophy to collect system relay protection method, has
Have the advantages that high reliablity, sensitivity are high, the wind-power electricity generation station suitable for various types different capabilities size.
The purpose of the present invention is what is be achieved through the following technical solutions：
It is a kind of based on station domain protection philosophy wind power plant collect system relay protection method, including：
Identical protective relaying device is installed respectively respectively collecting feeder line exit, ground connection change side and main transformer low-pressure side, often
Set protective relaying device follows IEC61850 specification and is communicated, and the electrical quantity that its internal electron formula mutual inductor is measured is believed
Breath is sent to station level decision center；
Fault type is determined according to the size relation between each electric quantity information by station level decision center, further according to event
Hinder type and enables corresponding station domain protection mechanism.
It is described to determine that fault type includes according to the size relation between each electric quantity information by station level decision center：
When kth collects the zero-sequence current of the electronic mutual inductor measurement in feeder line exitEqual to the electronics that ground connection becomes side
The zero-sequence current for the collection bus that formula transformer measurement arrivesThen indicate that kth collects feeder line and single-phase fault occurs：
When kth collects the electric current of the electronic mutual inductor measurement in feeder line exitIt is mutual with the electronic type of main transformer low-pressure side
The electric current that sensor measuresMeet following formula, then kth collects feeder line generation phase-to phase fault：
Wherein, KadFor adjustment factor；
When the zero-sequence current for the collection bus that the electronic mutual inductor that ground connection becomes side measuresGo out with each feeder line that collects
The zero-sequence current that the zero-sequence current of electronic mutual inductor measurement and the electronic mutual inductor of main transformer low-pressure side at mouthful measure
Difference be all larger than the setting valve I of settingset1, then it represents that singlephase earth fault occurs for collection bus：
Wherein, p=1 when 2,3, indicates the zero-sequence current for the electronic mutual inductor measurement for accordingly collecting feeder line exit；p
=4, indicate the zero-sequence current that the electronic mutual inductor of main transformer low-pressure side measures
It is described to include according to the corresponding station domain protection mechanism of fault type enabling：
If collecting feeder line occurs single-phase fault or phase-to phase fault, respective circuit breakers tripping is controlled；
If singlephase earth fault occurs for collection bus, it is delayed or controls breaker time at current time.
As seen from the above technical solution provided by the invention, the fault characteristic and wind of blower complexity have been fully taken into account
The special topological structure of electric field, by carrying out fault distinguishing using the collected multiterminal information content of electronic mutual inductor, construction
Domain protection new principle of standing has preferable selectivity and quick-action, the wind power plant suitable for various types different capabilities size
It stands.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment
Attached drawing be briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this
For the those of ordinary skill in field, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is that wind power plant provided in an embodiment of the present invention collects system station domain protection wiring schematic diagram；
Fig. 2 is that collection bus single-phase fault protection act logical AND provided in an embodiment of the present invention collects route single-phase fault
Protection act logic chart；
Fig. 3 is that flow chart is protected in station domain provided in an embodiment of the present invention；
Fig. 4 is simulation model system schematic diagram provided in an embodiment of the present invention；
Fig. 5 is collection bus singlephase earth fault simulation result diagram provided in an embodiment of the present invention；
Fig. 6 collects feeder line phase-to phase fault simulation result diagram to be provided in an embodiment of the present invention；
Fig. 7 collects feeder line separate room fault simulation result figure to be provided in an embodiment of the present invention.
Specific embodiment
With reference to the attached drawing in the embodiment of the present invention, technical solution in the embodiment of the present invention carries out clear, complete
Ground description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on this
The embodiment of invention, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, belongs to protection scope of the present invention.
The embodiment of the present invention provides a kind of wind power plant based on station domain protection philosophy and collects system relay protection method, first
First, by the way of as shown in Figure 1 respectively collect feeder line exit, ground connection become side and main transformer low-pressure side install respectively it is identical after
Electrical protective device, every set protective relaying device follow IEC61850 specification and are communicated, its internal electron formula mutual inductor is measured
Obtained electric quantity information is sent to station level decision center；Then, by station level decision center according to each electric quantity information it
Between size relation determine fault type, enable corresponding station domain protection mechanism further according to fault type.
In Fig. 1, first collect feeder line, second collect feeder line, third collects electricity in the protective relaying device of feeder line exit
Minor mutual inductor is respectively TA1, TA2, TA3；Electronic mutual inductor in main transformer low-pressure side protective relaying device is TA4；Ground connection
Become the electronic mutual inductor in the protective relaying device of side as TA5.
In the embodiment of the present invention, determine that fault type is specific as follows according to the size relation between each electric quantity information：
1) when kth collects the zero-sequence current of the electronic mutual inductor measurement in feeder line exitEqual to the electricity that ground connection becomes side
The zero-sequence current for the collection bus that minor transformer measurement arrivesThen indicate that kth collects feeder line and single-phase fault occurs：
Illustratively, when first collects feeder line, and single-phase fault occurs,
2) when collecting route generation phase-to phase fault, because system side capacity is much larger than blower side capacity, for non-faulting
For route, system side failure current weight is much larger than fault component electric current at line outlet is respectively collected, i.e.,
It is invalid.When collecting route generation phase-to phase fault, the fault component electric current in faulty line exit by non-fault line and is
System side provides jointly, at this point, if kth collects the electric current of the electronic mutual inductor measurement in feeder line exitWith main transformer low pressure
The electric current that the electronic mutual inductor of side measuresMeet following formula, then kth collects feeder line generation phase-to phase fault：
Wherein, KadFor adjustment factor.
3) when singlephase earth fault occurs for collection bus, due to the connection type that main transformer and case become, zero-sequence current is only
It flows through bus and ground connection becomes.Zero-sequence current at current transformer TA1 at this time, TA2, TA3, TA4 is only out-of-balance current, only
Having has apparent zero-sequence current at current transformer TA5, i.e., ground connection change zero-sequence current is significantly greater than three and collects at line outlet
And the zero-sequence current of main transformer low-pressure side.The zero-sequence current that this fault signature also indicates that ground connection becomes branch has certain numerical value,
I.e. ground fault has occurred in system certainly, and ground fault one is positioned at current transformer TA1, TA2, TA3, and TA4, TA5 are enclosed
At region.When the zero-sequence current for the collection bus that the electronic mutual inductor that ground connection becomes side measuresCollect feeder line with each
The zero sequence electricity that the zero-sequence current of electronic mutual inductor measurement and the electronic mutual inductor of main transformer low-pressure side in exit measure
The difference of stream is all larger than the setting valve I of settingset1：
Wherein, p=1 when 2,3, indicates the zero-sequence current for the electronic mutual inductor measurement for accordingly collecting feeder line exit；p
=4, indicate the zero-sequence current that the electronic mutual inductor of main transformer low-pressure side measures.
At this point, illustrating that ground connection becomes zero-sequence current while significantly greater than three and collects at line outlet and main transformer low-pressure side
Singlephase earth fault occurs for zero-sequence current, i.e. collection bus：Shown in collection bus single-phase fault protection act logic such as Fig. 2 (a),
" & " represents logical "and" in figure.
On the other hand, when collecting route generation singlephase earth fault, when fault signature is with collection bus single-phase fault
Fault signature it is similar, only fault point is transferred to a certain item by bus and collects on feeder line, and zero-sequence current circuit is by bus-ground connection
Change is converted to failure and collects feeder line-ground connection change.When first collects feeder line, and single-phase fault occurs,Current transformer
Zero-sequence current at TA5 is greater than TA2, the zero-sequence current at TA3, TA4, that is to say, that Protection criteria at this time can still be continued to use
CriterionOnly its criterion result of faulty line is " 0 ", and non-fault line its criterion result is " 1 ".
When all criterion results are " 1 ", as collection bus single-phase fault, such situation had been analyzed.Collect route list as a result,
Shown in phase-failure protection action logic such as Fig. 2 (b), " >=1 " represents logical "or" in figure.
In summary new criterion is protected in station domain, by realizing that the temporal mutual cooperation of each Protection criteria is suitable with fault distinguishing
The coordination of sequence constructs the new wind power plant of one kind and collects the protection of system station domain.
Its protection scope is that wind power plant 35kV collects route and collection bus, comprehensively utilizes the electricity of bus institute connecting lines
Stream and busbar voltage protect collection bus and collect all types failure of route, and the standby for undertaking section box change is protected
Protective function.Domain protection process of standing is as shown in figure 3, determine fault type according to the electric quantity information measured first, and then carry out
Fault location, further according to fault type using enabling corresponding station domain protection mechanism, if such as collecting feeder line single-phase fault occurring
Or phase-to phase fault, then control respective circuit breakers tripping；If singlephase earth fault occurs for collection bus, it is delayed or current
Moment controls breaker time.In the embodiment of the present invention, collection bus and the different types of faults for collecting feeder line are divided
Criterion that Cai Yong be not different identifies abort situation；For collection bus singlephase earth fault with to collect Feeder equal
It is identified using scheme described in above-described embodiment, and case accident barrier can also be by collecting feeder line phase-to phase fault new criterion
To collect route where positioning failure case becomes；And collection bus phase-to phase fault can be known using conventional bus differential protection criterion
Not, and using conventional electric current main protection and its setting valve it positions phase-to phase fault place and collects route.
Closed-loop test of the present invention on power system real-time simulation device (RTDS) is given below as a result, as shown in Figure 4.
Wind-driven generator：Rated capacity SGW is 1.5MW, stator voltage rating 0.69kV, and Stator and Rotor Windings turn ratio is
2.6377, stator resistance and leakage inductance are respectively 0.00806pu and 0.168pu, rotor resistance and leakage inductance be 0.006pu and
0.152pu, magnetizing inductance 3.48pu.
Case becomes：Rated capacity ST1N is 1.6MVA, and voltage rating is 35000 ± 2 × 2.5%/690V, and connection group number is D/
Yn11, primary side rated current are 26.39A, and secondary side rated current is 1338.8A, and short-circuit impedance UT1k% is 6.5, load
Loss is 1610W, no-load loss 13156W, no-load current 2.95A.
Collect route：Voltage class 35kV is overhead line, and model LGJ-150, length is 10km, resistance per unit length
It is respectively r1=0.21 Ω/km, x1=0.379 Ω/km, x0=1.33 Ω/km with reactance.
Main transformer：Rated capacity ST2N is 100MVA, and voltage rating is 230 ± 8 × 1.25%/35kV, and connection group number is YN/
D11, high-pressure side rated current are 251A, and low-pressure side rated current is 1649.6A, and short-circuit impedance UT2k% is 14.22, load damage
Consumption is 285kW, no-load loss 63.4kW, no-load current 0.2%.
Grounding transformer：Rated capacity 1220kVA, voltage rating 35/10.5kV, connection group number are Znyn11, primary side
Neutral point is grounded through 261 Ω ground resistance rg, and secondary side is unloaded, and zero sequence impedance ZT0 is 133 Ω.
The general very little of Zero-sequence Impedance for Earthing Transformer, only 10 ohms.
Transmission line：Voltage class 220kV, length 50km, unit length parameter r ' 1=0.076 Ω/km, x ' 1=0.338
Ω/km, r ' 0=0.284 Ω/km, x ' 0=0.824 Ω/km.
System：Using External Grid simulation system side, voltage rating 220kV, maximum capacity of short circuit is
3052MVA, minimum capacity of short circuit are 1581MVA.
Example 1：A phase ground fault occurs for collection bus
As seen from Figure 5, main transformer low-pressure side and all almost equal (curves in Fig. 5 of zero-sequence current size for collecting feeder line
Essentially coincide), it is all satisfiedJudge that single-phase fault occurs for bus.It can then be delayed according to the actual situation
Or i.e. vertical excision failure.
Example 2：First collect the end feeder line # occur AB double earthfault collect the end route 1# occur A phase be grounded therefore
Barrier.
In Fig. 6 a, two curves essentially coincided collect feeder line for second and third collects the A phase current curve of feeder line, rise
Lying prostrate biggish curve is the first A phase current curve for collecting feeder line；In Fig. 6 b, two curves essentially coincided collect feedback for second
Line and third collect the B current curve of feeder line, and the curve of big rise and fall is the first B phase current curve for collecting feeder line.
It will be appreciated from fig. 6 that first collects the A phase of feeder line, B phase short circuit current is all larger than setting valve, that is, first collects feeder line hair
Two-phase or double earthfault are given birth to, immediately tripping respective circuit breakers.
Example 3：First, which collects the end feeder line #, occurs A phase ground fault
In Fig. 7, two curves essentially coincided collect feeder line for second and third collects the A phase current curve of feeder line, most
The dotted curve of lower lower section is the first A phase current curve for collecting feeder line.
As shown in Figure 7, only the first zero-sequence current for collecting feeder line is unsatisfactory forYou can get it first collects
Single-phase fault occurs for feeder line, immediately tripping respective circuit breakers.
The above scheme of the embodiment of the present invention is believed by the electrical quantity that the electronic mutual inductor acquisition of wall collects system
Breath, and station level decision center is uploaded to by combining unit, fault location is carried out according to new station domain Protection criteria.The party
Method has fully taken into account the fault characteristic of blower complexity and the topological structure that wind power plant is special, by being adopted using electronic mutual inductor
The multiterminal information content collected carries out fault distinguishing, and the station domain protection new principle of construction has preferable selectivity and quick-action, fits
Wind-power electricity generation station for various types different capabilities size.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Within the technical scope of the present disclosure, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of claims
Subject to enclosing.
Claims (2)
1. a kind of wind power plant based on station domain protection philosophy collects system relay protection method, which is characterized in that including：
Respectively collect feeder line exit, ground connection becomes side and main transformer low-pressure side and installs identical protective relaying device respectively, every set after
Electrical protective device follows IEC61850 specification and is communicated, and the electric quantity information that its internal electron formula mutual inductor is measured is sent out
It send to station level decision center；
Fault type is determined according to the size relation between each electric quantity information by station level decision center, further according to failure classes
Type enables corresponding station domain protection mechanism；
Wherein, described that fault type packet is determined according to the size relation between each electric quantity information by station level decision center
It includes：
When kth collects the zero-sequence current of the electronic mutual inductor measurement in feeder line exitIt is mutual equal to the electronic type that ground connection becomes side
The zero-sequence current for the collection bus that sensor measuresThen indicate that kth collects feeder line and single-phase fault occurs：
When kth collects the fault current component of the electronic mutual inductor measurement in feeder line exitWith the electronics of main transformer low-pressure side
The fault current component electric current that formula transformer measurement arrivesMeet following formula, then kth collects feeder line generation phase-to phase fault：
Wherein, KadFor adjustment factor；
When the zero-sequence current for the collection bus that the electronic mutual inductor that ground connection becomes side measuresCollect feeder line exit with each
The zero-sequence current of electronic mutual inductor measurement and the difference of zero-sequence current that measures of the electronic mutual inductor of main transformer low-pressure side
It is all larger than the setting valve I of settingset1, then it represents that singlephase earth fault occurs for collection bus：
Wherein, p=1 when 2,3, indicates the zero-sequence current for the electronic mutual inductor measurement for accordingly collecting feeder line exit；P=4,
Indicate the zero-sequence current that the electronic mutual inductor of main transformer low-pressure side measures.
2. a kind of wind power plant based on station domain protection philosophy according to claim 1 collects system relay protection method,
It is characterized in that, it is described to include according to the corresponding station domain protection mechanism of fault type enabling：
If collecting feeder line occurs single-phase fault or phase-to phase fault, respective circuit breakers tripping is controlled；
If singlephase earth fault occurs for collection bus, it is delayed or controls breaker time at current time.
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| CN109842100B (en) * | 2017-11-27 | 2022-06-10 | 中国电力科学研究院有限公司 | Method and system for improving zero-sequence current differential protection of half-wavelength power transmission line |
| CN108429246A (en) * | 2018-03-29 | 2018-08-21 | 内蒙古电力勘测设计院有限责任公司 | A kind of wind power plant current collection line protection method and device |
| CN113092951B (en) * | 2021-06-10 | 2021-08-06 | 沈阳工业大学 | Offshore wind farm complex topology line fault information prediction method and device |
| CN113488964B (en) * | 2021-07-27 | 2023-02-21 | 西安热工研究院有限公司 | System and method for protecting high-speed permanent magnet wind driven generator and outgoing cable by electric quantity |
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| CN102244380B (en) * | 2010-12-22 | 2013-09-11 | 保定天威集团有限公司 | Open-phase protection method and device of 35kV American box-type substation for wind power station |
| CN202076784U (en) * | 2011-06-28 | 2011-12-14 | 内蒙古电力勘测设计院 | Protective system for collecting line of wind power plant |
| CN102882229B (en) * | 2012-09-21 | 2015-06-17 | 北京金风科创风电设备有限公司 | Automatic control system for dynamic voltage of wind power plant |
| CN204732888U (en) * | 2015-05-25 | 2015-10-28 | 国家电网公司 | The micro-grid system of a kind of grid type island electrical network |
| CN105391033B (en) * | 2015-11-24 | 2018-06-26 | 国网甘肃省电力公司 | Layering for large-scale wind power generation divides domain anti-isolated island guard method |
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