CN105896491B - A kind of multilayer wheel grade suitable for extensive new energy power station interlocks isolated island guard method - Google Patents
A kind of multilayer wheel grade suitable for extensive new energy power station interlocks isolated island guard method Download PDFInfo
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- CN105896491B CN105896491B CN201610383736.0A CN201610383736A CN105896491B CN 105896491 B CN105896491 B CN 105896491B CN 201610383736 A CN201610383736 A CN 201610383736A CN 105896491 B CN105896491 B CN 105896491B
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- 230000006641 stabilisation Effects 0.000 claims abstract description 9
- 238000011105 stabilization Methods 0.000 claims abstract description 9
- 230000008569 process Effects 0.000 claims abstract description 8
- 230000009471 action Effects 0.000 claims description 8
- 230000017105 transposition Effects 0.000 claims description 5
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- 238000011079 streamline operation Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 4
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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
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Abstract
The invention discloses a kind of multilayer wheel grades suitable for extensive new energy power station to interlock isolated island guard method, including：(1) it according to the stable region degree of extensive new energy power station system, determines the definite value of isolated island protection feature amount, system stabilization is divided into multiple levels；(2) device type being spaced according to each of extensive new energy power station, and outlet matrix configuration, generate corresponding logical expression；(3) wheel grade interlock logic is generated；(4) by calculating characteristic variable value in real time, the stabilization level of system after identification island phenomenon occurs ensures rapidity, the reliability of outlet tripping according to the differentiation of wheel grade interlock logic as a result, acting on outlet matrix.Application wheel grade interlock logic method of the present invention prevents the mistake that extensive new energy power station isolated island protection occurs in the process from cutting problem, has higher automatization level; it being capable of streamline operation; operation and maintenance cost are reduced, increases the reliability of operation, while this method has wide applicability.
Description
Technical field
The present invention relates to a kind of multilayer wheel grades suitable for extensive new energy power station to interlock isolated island guard method, belongs to new
Energy technology field.
Background technology
New energy power station system is compared with traditional electrical network power station system, scale is smaller, to adapt to each need from different places
It asks, usually contains a variety of power equipments, such as grid-connected switch, energy storage inverter, distributed generation resource, load etc..When major network due to
When specific reasons stop power supply, the power load of new energy power station and surrounding forms island phenomenon, and unplanned property isolated island is existing
The generation of elephant can bring unpredictable harm to system equipment and related personnel.The new energy power station built at present has power generation
The features such as capacity is larger, synchronizing mode is complicated, the configuration of multiple energy storage inverter, after island phenomenon occurs, extensive new energy
The multiple combinations mode in power station, forms a variety of operating statuses, and the stability characteristic (quality) of system is also not quite similar under various states, existing
Isolated island guard method often cause load and the over-cutting of generating equipment, expand scope of power outage, reduce new energy
Utilization rate.Therefore a kind of effective isolated island guard method is found, under each method of operation of extensive new energy power station,
Can quickly, reliably be tripped outlet, while prevent the over-cutting during protection, and power grid system is effectively accessed for new energy
System has great importance.
The wheel grade control technology of conventional electric power system generally according to the characteristic quantities such as voltage, the amplitude of frequency, phase, slippage into
Row differentiates, when island phenomenon causes characteristic quantity beyond the range allowed, and after meeting certain dynamic condition, it is believed that system enters
Instability status, and then trigger protection control device controls system.Extensive new energy power station contains a large amount of distribution
The energy, distributed energy have the natural characteristics such as unstable, intermittent, randomness so that the stability characteristic (quality) of system one compared with
It floats in big section.New energy power station system is also related to geographical location, the new energy resources system of different regions, because of access point
The quantity of the cloth energy, the difference of characteristic, and also have larger difference in dynamic characteristic, voltage, frequency after island phenomenon generation
The characteristic of rate may also be different.
The action message for realizing the isolated island protection of extensive new energy power station system, needs intelligent recognition new energy power station
Current operational mode carries out the layering control methods taken turns more, acquires grid entry point, distributed generation resource, energy-storage units, load in real time
Line information carries out system stabilizing determination.After island phenomenon leads to system unstability, according to preset strategy, positioning system
The residing stabilization level of system, using wheel grade interlocking techniques, a series of switches of shunt tripping policy definition realize quick, reliable jump
Lock exports, and realizes the rebalancing of system, while preventing the over-cutting during protection.
Therefore need a kind of new technical solution to solve the above problems.
Invention content
The object of the present invention is to provide a kind of multilayer wheel grade interlocking isolated island protection sides suitable for extensive new energy power station
Method divides the stabilization grade of micro-grid system in a hierarchical fashion, to take turns the rebalancing that the interlocking technology of grade realizes system, realizes
Quickly, reliable tripping outlet, the over-cutting during prevention protection.
For achieving the above object, following technical solution can be used in the present invention：
A kind of multilayer wheel grade suitable for extensive new energy power station interlocks isolated island guard method, includes the following steps：
(1), it according to the stable region degree of extensive new energy power station system, determines the definite value of isolated island protection feature amount, will be
System stabilization is divided into multiple levels；
(2), the device type being spaced according to each of extensive new energy power station, and outlet matrix configuration, generation pair
The logical expression answered；
(3), wheel grade interlock logic is generated；
(4), by calculating characteristic variable value in real time, the stabilization level of system after identification island phenomenon occurs, according to wheel grade
Interlock logic differentiates as a result, acting on outlet matrix：If taking turns grade interlock logic differentiates that result is made for real movement, correspondence is acted on
The outlet matrix of level；If taking turns grade interlock logic differentiates that result is feinting deception, it is latched the outlet matrix of corresponding level.
Further, in the step (1), level division includes：Held according to generating equipment in extensive new energy power station
Amount, load capacity and the connection relation with power distribution network, determine the stable region degree of this system, according in extensive new energy power station
The definite value of system isolated island protection feature amount divides multiple stable level LEVEL (n).
Further, in the step (2), generating logical expression includes：It is integrally according to extensive new energy power station
System framework, it includes grid entry point switch SW (n), points of common connection switch SWT (n), busbar BUS to define the device type being each spaced
(n), controllable burden and power switch OP (n)；According to same level division principle, each spacing devices are collected into corresponding level
Under, generate each level logical device expression formula, LEVEL (n)：{ SW (i), BUS (j), OP (k) ... }.
Further, in the step (3), wheel grade interlock logic includes：Each wheel grade actuating signal ACT (n) is defined, is divided
Each wheel is two-step evolution, and the logic discrimination of latter wheel grade starts after the completion of the action of previous round grade；Definition wheel grade interlocking signal
LOCK (n) monitors the process of decline and the rise of characteristic quantity in real time, calculates the steepness DT of changing features amount, when detection steepness side
To change, and after meeting two-stage characteristic quantity transposition section, it is latched next stage round cut immediately and accordingly exports matrix, logical expression
Formula is LOCK (n)：(DT>0)&LEVEL(n)；Epicycle level interlock logic expression formula is ACT (n)：ACT(n-1)&NOT
(LOCK(n))。
Further, in the step (4), by calculating characteristic variable value in real time, after quickly identifying that island phenomenon occurs
The stabilization level of system, and carry out wheel grade interlock logic and differentiate；Including the directly exported mode of use, or it is based on high-speed traffic
The mode of GOOSE mechanism, the mistake during preventing isolated island from protecting cut problem.
The beneficial effects of the present invention are：
Extensive new energy power station isolated island is protected and is divided into multilayer step cone grade action process by the present invention, between each layer wheel grade
The interlocking that adjacent level is realized by taking turns grade interlock logic expression formula prevents from going out during extensive new energy power station isolated island protection
Existing mistake cuts problem, has higher automatization level, can simplify complicated operating process, reduce operation and safeguard at
This, increases the reliability of operation.Which kind of characteristic variable concrete application demand is depended on due to the use of, therefore this method has extensively
General applicability has extremely wide application prospect in extensive new energy power station.
Description of the drawings
The interlocking logical schematic of multilayer wheel grade of Fig. 1 amounts characterized by frequency.
The wheel grade interlocking of Fig. 2 amounts characterized by frequency avoided the schematic diagram cut.
The interlocking logical schematic of multilayer wheel grade of Fig. 3 amounts characterized by voltage.
Specific implementation mode
In the following with reference to the drawings and specific embodiments, the present invention is furture elucidated, it should be understood that these embodiments are merely to illustrate
It the present invention rather than limits the scope of the invention, after having read the present invention, those skilled in the art are to of the invention each
The modification of kind equivalent form falls within the application range as defined in the appended claims.
The multilayer wheel grade interlocking isolated island guard method suitable for extensive new energy power station of the present invention specifically includes following
Several steps：
(1) according to generating equipment capacity in extensive new energy power station, load capacity and with the connection relation of power distribution network,
The stable region degree for determining this system divides multiple according to the definite value in extensive new energy power station system isolated island protection feature amount
Stablize level LEVEL (n).
(2) according to extensive new energy power station overall system architecture, the device type being each spaced, such as grid entry point are defined
Switch SW (n), points of common connection switch SWT (n), busbar BUS (n), controllable burden and power switch OP (n)；According to identical layer
Grade division principle, each spacing devices are collected under corresponding level, generate each level logical device expression formula, LEVEL (n)：
{ SW (i), BUS (j), OP (k) ... }.
(3) each wheel grade actuating signal ACT (n) is defined, it is two-step evolution to divide each wheel, and the logic discrimination of latter wheel grade is necessary
Start after the completion of the action of previous round grade；Definition wheel grade interlocking signal LOCK (n) monitors the decline and rise of characteristic quantity in real time
Process, calculate the steepness DT of changing features amount, when detection steepness direction changes, and meet two-stage characteristic quantity transposition section
Afterwards, it is latched next stage round cut immediately and accordingly exports matrix, logical expression is LOCK (n)：(DT>0)&LEVEL(n).Epicycle
Level interlock logic expression formula is ACT (n)：ACT(n-1)&NOT(LOCK(n)).
(4) it by calculating characteristic variable value in real time, quickly identifies the stabilization level of system after island phenomenon occurs, and carries out
Grade interlock logic is taken turns to differentiate.If taking turns grade interlock logic differentiates that result is action, the outlet matrix of corresponding level is acted on；Such as
Fruit takes turns grade interlock logic and differentiates that result is action, then is latched the outlet matrix of corresponding level.Directly exported mode generally can be used,
Or the mode based on high-speed traffic GOOSE mechanism, ensure rapidity, the reliability of outlet tripping, prevents isolated island from protecting process
In mistake cut problem.
In the present embodiment, shown in FIG. 1 is a frequency amount of being characterized, and adds two independent level knots with four interlocking levels
The extensive new energy power station system rock-steady structure that structure divides illustrates that multilayer wheel grade interlocks below by taking the new energy power station as an example
The generation of isolated island guard method logic differentiates process.
According to technical scheme steps, (1) protects frequency according to the stable region degree and isolated island of extensive new energy power station system
The definite value of rate characteristic quantity divides multiple four stable levels, i.e. LEVEL (1)：[F1, F0], LEVEL (2)：[F2, F1], LEVEL
(3)：[F3, F2], LEVEL (4)：[F4, F3].
(2) according to extensive new energy power station overall system architecture, the device type being each spaced is defined, such as this is energy
There is 3, grid entry point switch in source power station, then defines SW (1), SW (2), SW (3)；2, points of common connection switch, then define SWT (1),
SWT(2)；Two groups of busbar BUS (1), BUS (2), controllable burden and power switch 5, then define OP (1), OP (2) ..., OP
(5).According to the outlet matrix configuration of each level, each spacing devices are collected under corresponding level, each level logic is generated and sets
Standby expression formula, such as LEVEL (1)：{ SW (1), BUS (2), SWT (1), OP (4) }, LEVEL (2)：{ BUS (2), OP (1), OP
(2), (5) OP }, LEVEL (3)：{ SW (2), BUS (2), OP (3), OP (4) } ..., LEVEL (5)：{ BUS (2), SWT (2), OP
(1), (2) OP, OP (5) }.
(3) wheel grade interlock logic is generated, characteristic quantity is frequency, then the steepness of changing features amount is defined as DT (F), then first
Level interlocking signal expression formula is LOCK (1)：(DT(F)>0) (1), the first level interlock logic expression formula is ACT
(1)：ACT(0)&NOT(LOCK(1))；Second level interlocking signal expression formula is LOCK (2)：(DT(F)>0) (2) &LEVEL,
Second level interlock logic expression formula is ACT (2)：ACT(1)&NOT(LOCK(2))；Third, the 4th level and so on.
(4) characteristic variable, i.e. system frequency value F are calculated in real time, it is assumed that frequency calculated value F：[F2, F1], according to step (1)
Level division result is carried out, system belongs to stable level LEVEL (2) after quickly identifying island phenomenon generation, by the time of Tf2
Broadening, frequency F do not drop to F2 hereinafter, not entering the transposition section of the second level, so LOCK (2) is false, logic mutual
Lock expression formula ACT (2) is true, then in the outlet matrix of the first level, sphere of action is LEVEL (2) for isolated island protective effect：{BUS
(2), (1) OP, OP (2), OP (5) }.
(5) new energy power station is assumed after the second wheel connection is cut, system frequency bottom out, but frequency values have fallen to F2
Hereinafter, i.e. F：[F2, F1], as shown in Fig. 2, carrying out level division result according to step (1), quickly system belongs to steady at this time for identification
Given layer grade LEVEL (3), frequency F drop to F2 hereinafter, entering the transposition section of the second level, but frequency bottom out, i.e.,
DT(F)>0, so LOCK (3)：(DT(F)>0) &LEVEL (3) is true, logical interlock expression formula ACT (3)：ACT(2)&NOT
(LOCK (3)) are false, then are latched the outlet matrix of third level, and realize prevented that cuts to ask after the protection of the second level isolated island
Topic.
For above example using frequency as characteristic quantity, Fig. 3 is that a typical case is described using voltage as characteristic quantity is new on a large scale
The rock-steady structure of energy electric power station system, implementation is similarly.
Above example is only the explanation to technical solution of the present invention, and protection scope of the present invention is not limited to this,
The modification or equivalent replacement that any skilled professional staff carries out specific embodiments of the present invention, should be included in the present invention
Right within.
Claims (4)
1. a kind of multilayer wheel grade suitable for extensive new energy power station interlocks isolated island guard method, which is characterized in that including with
Lower step：
（1）, according to the stable region degree of extensive new energy power station system, determine the definite value of isolated island protection feature amount, system is steady
Surely multiple levels are divided into；
（2）, the device type that is spaced according to each of extensive new energy power station, and outlet matrix configuration generates corresponding
Logical expression；
（3）, generate wheel grade interlock logic；Taking turns grade interlock logic includes：Each wheel grade actuating signal ACT (n) is defined, dividing each wheel is
The logic discrimination of two-step evolution, latter wheel grade starts after the completion of the action of previous round grade；Define each wheel grade interlocking signal LOCK
(n), the process of decline and the rise of monitoring characteristic quantity, the steepness DT of calculating changing features amount change when detecting steepness direction in real time
Become, and after meeting two-stage characteristic quantity transposition section, be latched next stage round cut immediately and accordingly export matrix, logical expression
For LOCK (n)：(DT > 0) & LEVEL(n)；Epicycle level interlock logic expression formula is ACT (n)：ACT(n-1) & NOT
(LOCK(n))；
（4）, by calculating characteristic variable value in real time, the stabilization level of system after identification island phenomenon occurs, according to wheel grade interlocking
Logic discrimination is as a result, act on outlet matrix：If taking turns grade interlock logic differentiates that result is made for real movement, corresponding level is acted on
Outlet matrix；If taking turns grade interlock logic differentiates that result is feinting deception, it is latched the outlet matrix of corresponding level.
2. the multilayer wheel grade according to claim 1 suitable for extensive new energy power station interlocks isolated island guard method,
It is characterized in that, the step（1）In, level division includes：Held according to generating equipment capacity, load in extensive new energy power station
Amount and the connection relation with power distribution network, determine the stable region degree of this system, according in extensive new energy power station system isolated island
The definite value of protection feature amount divides multiple stable level LEVEL (n).
3. the multilayer wheel grade according to claim 1 suitable for extensive new energy power station interlocks isolated island guard method,
It is characterized in that, the step（2）In, generating logical expression includes：It is fixed according to extensive new energy power station overall system architecture
The device type that is each spaced of justice includes grid entry point switch SW (n), points of common connection switch SWT (n), busbar BUS (n), controllably
Load and power switch OP (n)；According to same level division principle, each spacing devices are collected under corresponding level, are generated
Each level logical device expresses formula, LEVEL (n)：{ SW (i), BUS (j), OP (k) } or LEVEL (n)：{ SW (i), BUS
(j), SWT (n), OP (k) }.
4. the multilayer wheel grade according to claim 1 suitable for extensive new energy power station interlocks isolated island guard method,
It is characterized in that, the step（4）In, by calculating characteristic variable value in real time, system is steady after quickly identification island phenomenon occurs
Given layer grade, and carry out wheel grade interlock logic and differentiate；Including the directly exported mode of use, or it is based on high-speed traffic GOOSE mechanism
Mode, prevent isolated island protect during mistake cut problem.
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| CN103311906A (en) * | 2013-03-19 | 2013-09-18 | 山东理工大学 | Switch displacement island detection and direct-trip island protection method based on wide area information |
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| CN104319871A (en) * | 2014-09-30 | 2015-01-28 | 国家电网公司 | Transformer station domain island protection and backup automatic switching integrated method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101269659B1 (en) * | 2011-09-05 | 2013-05-30 | 카코뉴에너지 주식회사 | New and renewable energy generation system and its anti islanding protecting method |
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- 2016-06-02 CN CN201610383736.0A patent/CN105896491B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103311906A (en) * | 2013-03-19 | 2013-09-18 | 山东理工大学 | Switch displacement island detection and direct-trip island protection method based on wide area information |
| CN104242270A (en) * | 2014-09-18 | 2014-12-24 | 南京南瑞继保电气有限公司 | Passive anti-island protection maloperation preventing method |
| CN104319871A (en) * | 2014-09-30 | 2015-01-28 | 国家电网公司 | Transformer station domain island protection and backup automatic switching integrated method |
Non-Patent Citations (1)
| Title |
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| 载波闭锁式孤岛保护方案;樊淑娴等;《电力***保护与控制》;20110116;第39卷(第2期);第119-124页 * |
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