CN108736493A - Construction method, control system and the control method on power system security island - Google Patents
Construction method, control system and the control method on power system security island Download PDFInfo
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- CN108736493A CN108736493A CN201810560668.XA CN201810560668A CN108736493A CN 108736493 A CN108736493 A CN 108736493A CN 201810560668 A CN201810560668 A CN 201810560668A CN 108736493 A CN108736493 A CN 108736493A
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- safety island
- island
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- load
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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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
- H02H7/262—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 switching or blocking orders
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
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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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The present invention discloses the construction method on power system security island, includes the following steps：Unit rated capacity is close, electric position is close and load are bound, and are formed a safety island, are specified safety island contact with foreign countries section；When electric system is broken down, according to failure scene, safety island internal fault control strategy and safety island external fault control strategy are executed respectively；When power system frequency or electric voltage exception, safety island off-the-line strategy is executed, solution is listed from electric system by the safety island, prevents electric system full cut-off；Multiple safety islands realize sequentially off-the-line by the way that different frequencies, voltage and delay definite value is arranged.Construction method, control system and the control method on power system security island proposed by the present invention, can do not increase provide for oneself power grid primary equipment input under the premise of, power grid full cut-off accident is not provided in guarantee for oneself, retain power supply for fast quick-recovery after accident, there is the economic implications and practical value of highly significant to providing power grid for oneself.
Description
Technical field
The present invention relates to the construction method on power system security island, control system and control methods, belong to electric system certainly
Dynamicization control technology field.
Background technology
Some industrial enterprise of China occur in evolution in recent years for " the small net of the big big load of machine " type electric system
A kind of large-sized unit, big load, mini system provide electric network composition for oneself, and the generally high energy-consuming enterprises such as metallurgy, refinery provide power grid for oneself.
Relative to large-scale power system, " the small net of the big big load of machine " type enterprise, which provides power grid for oneself, has net capacity smaller, and structure is than relatively thin
Weak, and bulk power grid is weaker contacts or without contacting, and power grid is provided for oneself and is equipped with single machine in power grid there are the probability of isolated power grid is bigger
The larger unit of capacity and the larger load of single group capacity (opposite provide for oneself net capacity for), there are stability for the electric system
Difference, the features such as system Ability of Resisting Disturbance is poor.Under various fault ' conditions, the frequency of the electric system is easy fluctuation, very
To large-area power-cuts is caused, heavy losses are caused.
In order to realize the quick black starting-up after providing power grid full cut-off for oneself, need to spend huge fund configuration black starting-up power supply, on the one hand
The diesel engine of large capacity is purchased, on the other hand realizes fast cut-back band station-service Electricity Functional by the way that fired power generating unit is transformed.Above-mentioned hand
Section increases financial burden and the O&M burden of enterprise, and black starting-up power supply does not have to for a long time, is negligent of safeguarding, make to really needing
Used time, black starting-up success rate are very low.
So if a kind of construction method, control system and the control method on power system security island can be worked out,
Do not increase under the premise of providing power grid primary equipment input for oneself, power grid full cut-off accident does not occur for guarantee, is fast quick-recovery guarantor after accident
Power supply is stayed, there is the economic implications and practical value of highly significant to providing power grid for oneself.
Term explanation：The electric power that generating set is sent out is known as contributing, and so-called generating set output is exactly the unit interval
Interior electric energy.
Invention content
The purpose of the present invention is：Network system stability is poor, feature of Ability of Resisting Disturbance difference for providing for oneself, how to solve therefore
In the case of barrier, the technical issues of network system frequency easily occurs fluctuation, even results in large-area power-cuts is provided for oneself, and be accident
Fast quick-recovery retains power supply afterwards.
The present invention adopts the following technical scheme that：The construction method on power system security island, which is characterized in that including walking as follows
Suddenly：
Step SS1：Unit rated capacity is close, electric position is close and load are bound, and a safety island is formed, bright
True safety island contact with foreign countries section；
Step SS2：When electric system is broken down, according to failure scene, safety island internal fault control is executed respectively
System strategy and safety island external fault control strategy；
Step SS3：When power system frequency or electric voltage exception, execute safety island off-the-line strategy, by the safety island from
Solution is listed in electric system, prevents electric system full cut-off；Multiple safety islands are fixed by the way that different frequencies, voltage and delay is arranged
Value realizes sequentially off-the-line.
As a kind of preferred embodiment, the clear safety island contact with foreign countries section in the step SS1 specifically wraps
It includes：Under normal operation, the unit output controlled in the safety island is suitable with load level, that is, keeps the safety island pair
Outer contact section is close to zero trend.
As a kind of preferred embodiment, the safety island internal fault control strategy in the step SS2 specifically wraps
Include following steps：
Step SS21：Inside certain safety island after unit tripping, if safety island internal load size PL| go out with loss unit
Power PGDeviation in permissible range PsetIt is interior, i.e., | PG-PL|<Pset then only cuts off the load of respective volume inside safety island；It is no
Then, load is preferably cut off in entire electric system inner tissue, wherein the electric system of the preferred excision load of tissue includes safety
Island does not include other safety islands；
Step SS22：After the tripping of certain safety island internal load, if unit output and loss payload inside the safety island
Deviation in permissible range Pset, then only inside excision safety island respective volume unit；Otherwise, in entire electric system
Inner tissue preferably cuts off unit, wherein the electric system of the preferred excision unit of tissue includes safety island, does not include other safety
Island.
As a kind of preferred embodiment, the safety island external fault control strategy in the step SS2 specifically wraps
It includes：After unit or load trip outside safety island, load and unit inside each safety island are not involved in stability contorting, i.e., are only pacifying
Quan Dao outside organizations preferably cut off load or excision unit.
As a kind of preferred embodiment, when the power system frequency exception in the step SS3, safety island is executed
Off-the-line strategy specifically comprises the following steps：As power system frequency f>fhsetOr power system frequency f<flset, and inside safety island
The deviation of unit output and payload is in permissible range PsetIt is interior, delay time t>Allowed time range tset, tripping safety island
Contact with foreign countries section, by safety island, solution is listed from electric system, prevents electric system full cut-off；Wherein, flsetMore than low frequency
Cut off the definite value of the load first round, fhsetLess than the definite value of the high cut unit first round.
As a kind of preferred embodiment, when the power system voltage exception in the step SS3, safety island is executed
Off-the-line strategy specifically comprises the following steps：As voltage U in safety island>UhsetOr U<Ulset, and inside safety island unit output with it is negative
The deviation of lotus size is in permissible range PsetIt is interior, delay time t>Allowed time range tset, tripping safety island contact with foreign countries section,
By safety island, solution is listed from electric system, prevents electric system full cut-off, UlsetDetermining for the load first round is cut off more than low pressure
Value, UhsetLess than the definite value of the high cut unit first round.
The present invention also proposes the control system on power system security island, which is characterized in that including safety island inner controller,
Safety island outer control device, communication interface, the safety island inner controller by the communication interface with it is described
The outer control device communication connection of safety island.
The present invention also proposes the control method of the control system on power system security island, which is characterized in that including walking as follows
Suddenly：
Step S1：Control device outside safety island inner controller and safety island is configured in safety island, in the safety island
The power of the assembling unit, load power in control device acquisition safety island, safety island contact with foreign countries section tidal current, the safety island internal control
Device acquisition busbar voltage processed and power, the power of the assembling unit of the outer outer electric system of control device acquisition safety island of the safety island,
Load power；When safety island contact with foreign countries section, which sends out trend, runs off dead zone, the safety island inner controller sends out instruction
To unit, unit output in safety island is lowered；When safety island contact with foreign countries section by it is after the fashion run off dead zone when, the safety island
Inner controller sends out instruction to unit, unit output in safety island is raised, until safety island contact with foreign countries section tidal current is dead
Within the scope of area；Wherein, the setting of dead band value is adjusted according to specific power grid；
Step S2：When the safety island inner controller, which is sentenced, unit or load tripping, according to safety island internal fault
Control strategy is controlled, and is specifically comprised the following steps：Step S21：Inside certain safety island after unit tripping, if in the safety island
Portion payload PL| with loss unit output PGDeviation in permissible range PsetIt is interior, i.e., | PG-PL|<Pset then only cuts off intrinsic safety
The load of respective volume inside full island；Otherwise, load is preferably cut off in entire electric system inner tissue, wherein tissue is preferably cut
Except the electric system of load includes safety island, other safety islands are not included；Step S22：After the tripping of certain safety island internal load,
If the deviation of unit output and loss payload is in permissible range Pset inside the safety island, only cut off in safety island
The unit of portion's respective volume；Otherwise, unit is preferably cut off in entire electric system inner tissue, wherein the preferred excision unit of tissue
Electric system include safety island, do not include other safety islands；
Step S3：When outside safety island control device sentence unit or load and trip when, controlled according to safety island external fault
Strategy is controlled, and is specifically included：After unit or load trip outside safety island, load and unit inside each safety island are not joined
With stability contorting, i.e., only load or excision unit are preferably cut off in safety island outside organization；And safety island inner controller is latched,
The order of any excision load or unit is not received；
Step S4：Sentence when safety island inner controller and power system frequency exception, and meets power system frequency exception,
When executing the criterion of safety island off-the-line strategy, i.e., as power system frequency f>fhsetOr power system frequency f<flset, and safety island
The deviation of internal unit output and payload is in permissible range PsetIt is interior, delay time t>Allowed time range tset, tripping peace
Full island contact with foreign countries section, by safety island, solution is listed from electric system, prevents electric system full cut-off；Wherein, flsetIt is more than
The definite value of the low cut load first round, fhsetLess than the definite value of the high cut unit first round, then safety island inner controller
The tripping safety island contact with foreign countries section in outlet all switchs；Sentence when safety island inner controller and power system voltage exception,
And meet power system voltage exception, when executing the criterion of safety island off-the-line strategy, i.e., as voltage U in safety island>UhsetOr U<
Ulset, and the deviation of safety island inside unit output and payload is in permissible range PsetIt is interior, delay time t>Allowed time model
Enclose tset, tripping safety island contact with foreign countries section, by safety island, solution is listed from electric system, prevents electric system full cut-off,
UlsetMore than the definite value that low pressure cuts off the load first round, UhsetLess than the definite value of the high cut unit first round, then safety island internal control
Device outlet tripping safety island contact with foreign countries section processed all switchs.
As a kind of preferred embodiment, the step S1 further includes：The safety island inner controller is lowered or up-regulation
The instruction of unit output is realized by the distributed monitoring control system or digital electrohydraulic control system DEH of unit.
As a kind of preferred embodiment, the step S2 further includes：When only need to safety island inner tissue cut off load
Or when unit, tripping load is exported by safety island inner controller or unit switchs；When need cut off safety island outside load or machine
When group, control device outside safety island is sent instructions to by safety island inner controller, tripping is exported by control device outside safety island
Load or unit switch.
The advantageous effect that the present invention is reached：The construction method on power system security island proposed by the present invention, control system
And control method, can not increase provide for oneself power grid primary equipment input under the premise of, guarantee do not provide power grid full cut-off accident for oneself,
Retain power supply for fast quick-recovery after accident, there is the economic implications and practical value of highly significant to providing power grid for oneself.
Description of the drawings
Fig. 1 is the principle schematic of the preferred embodiment of the construction method on the power system security island of the present invention.
Fig. 2 is the principle schematic of the preferred embodiment of the control system on the power system security island of this present invention.
Specific implementation mode
The invention will be further described below in conjunction with the accompanying drawings.Following embodiment is only used for clearly illustrating the present invention
Technical solution, and not intended to limit the protection scope of the present invention.
As shown in Fig. 1 the principle signal of the preferred embodiment of the construction method on the power system security island of the present invention
Figure, the present invention propose the construction method on power system security island, include the following steps：
Step 1：By unit A and load A bindings, safety island A is formed, contact with foreign countries section is section A；By B of Unit and bear
Lotus B bindings, form safety island B, and contact with foreign countries section is section B.Under normal operation, the unit in safety island A (B) is controlled
A (B) outputs are on close level with load A (B), that is, keep safety island A (B) contact with foreign countries section A (B) close to zero trend.To avoid
The flexibility of the entire Operation of Electric Systems control of excessive influence, should not be arranged excessive safety island in an electric system.
Step 2：When electric system is broken down, according to failure scene, the control of safety island internal fault is executed respectively
Strategy and safety island external fault control strategy.
Step 2-1 is by taking safety island A as an example, if failure is happened inside safety island A, control strategy is as follows：
1) after unit A trippings, if the deviation that unit A contributes before load A and tripping is in permissible range PsetIt is interior, i.e., | PG-PL|<
Pset, then load A is only cut off；Otherwise, (A containing load is free of load B) the preferred cutting load of tissue in Integrated power system.
2) after load A trippings, if unit A contributes and the deviation of tripping preload A sizes is in permissible range PsetIt is interior, then only
Cut off unit A；Otherwise, (A containing unit is free of B of Unit) tissue preferably cuts unit in Integrated power system.
For step 2-2 for safety island external fault, control strategy is as follows：
After unit or load trip outside safety island, the load inside safety island A, B and unit, i.e. load A, B and unit
A, B is not involved in stability contorting, only in the preferred cutting load of safety island outside organization or cuts unit.
Step 3：When system frequency or electric voltage exception, safety island off-the-line strategy is executed, safety island is solved from electric system
It lists, anti-locking system full cut-off is illustrated by taking safety island A as an example below.
Step 3-1 works as system frequency f>fhsetOr f<flset, and unit A contributes and the deviation of load A sizes is in permissible range
PsetInterior, be delayed t>tset, tripping section A, by safety island A, solution is listed from system, anti-locking system full cut-off.flsetMore than low frequency
The definite value of the cutting load first round, fhsetLess than the definite value of the high-frequency cutting machine first round.
Step 3-2 is as voltage U in safety island A>UhsetOr U<Ulset, and unit A contributes and the deviation of load A sizes is being held
Perhaps range PsetInterior, be delayed t>tset, tripping section A, by safety island A, solution is listed from system, anti-locking system full cut-off.UlsetGreatly
In the definite value of the low pressure cutting load first round.
As shown in Fig. 2 the principle signal of the preferred embodiment of the control system on power system security island of the invention
Figure, the present invention also propose to control dress outside the control system on power system security island, including safety island inner controller, safety island
It sets, communication interface, the safety island inner controller outside the communication interface and the safety island by controlling dress
Set communication connection.
The present invention also proposes the control method of the control system on power system security island, includes the following steps：
Step 1：Control device A, control device B, the control device in safety island are configured inside safety island A, safety island B
It is interconnected through channel by communication interface with the control device configured outside safety island, constitutes power system security island control system
System；
Step 1-1：Control device A in safety island A is responsible for acquiring unit A power, load A power, section A trends, adopts
Collect busbar voltage, frequency, when the submitting of section A trends runs off dead zone, control device A issues an order to unit A, lowers unit A and contributes；
When section A trends are entered to run off dead zone, control device A issues an order to unit A, and up-regulation unit A contributes, until safety island A is external
Section tidal current is got in touch in dead zone range.
Step 1-2：Control device B in safety island B is responsible for acquiring B of Unit power, load B power, section B trends, adopts
Collect busbar voltage, frequency, when the submitting of section B trends runs off dead zone, control device B issues an order to B of Unit, lowers B of Unit and contributes；
When section B trends are entered to run off dead zone, control device B issues an order to B of Unit, and up-regulation B of Unit is contributed, until safety island B is external
Section tidal current is got in touch in dead zone range.
Step 1-3：Control device outside the safety island configured outside safety island, the unit work(of the outer electric system of acquisition safety island
Rate, load power.
Step 2：When safety island inner controller, which is sentenced, unit or load tripping, according to the step 2-1 institutes of construction method
Principle is stated to be controlled；
Step 3：When outside safety island control device sentence unit or load and trip when, control plan according to safety island external fault
It is slightly controlled, is specifically included：After unit or load trip outside safety island, load and unit inside each safety island are not involved in
Stability contorting only preferably cuts off load or excision unit in safety island outside organization；And safety island inner controller is latched, no
Receive the order of any excision load or unit；
Step 4：Sentence when safety island inner controller and power system frequency exception, and meets power system frequency exception,
When executing the criterion of safety island off-the-line strategy, i.e., as power system frequency f>fhsetOr power system frequency f<flset, and safety island
The deviation of internal unit output and payload is in permissible range PsetIt is interior, delay time t>Allowed time range tset, tripping peace
Full island contact with foreign countries section, by safety island, solution is listed from electric system, prevents electric system full cut-off；Wherein, flsetIt is more than
The definite value of the low cut load first round, fhsetLess than the definite value of the high cut unit first round, then safety island inner controller
The tripping safety island contact with foreign countries section in outlet all switchs；Sentence when safety island inner controller and power system voltage exception,
And meet power system voltage exception, when executing the criterion of safety island off-the-line strategy, i.e., as voltage U in safety island>UhsetOr U<
Ulset, and the deviation of safety island inside unit output and payload is in permissible range PsetIt is interior, delay time t>Allowed time model
Enclose tset, tripping safety island contact with foreign countries section, by safety island, solution is listed from electric system, prevents electric system full cut-off,
UlsetMore than the definite value that low pressure cuts off the load first round, UhsetLess than the definite value of the high cut unit first round, then safety island internal control
Device outlet tripping safety island contact with foreign countries section processed all switchs.
The above is only the typical case case of the present invention, is not intended to limit the present invention in any form, ability
Field technique personnel make a little simple modification, equivalent variations or modification using the technology contents of the disclosure above, all fall within the present invention
Protection domain in.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations
Also it should be regarded as protection scope of the present invention.
Claims (10)
1. the construction method on power system security island, which is characterized in that include the following steps：
Step SS1：Unit rated capacity is close, electric position is close and load are bound, and are formed a safety island, are clearly pacified
Full island contact with foreign countries section；
Step SS2：When electric system is broken down, according to failure scene, safety island internal fault is executed respectively and controls plan
It omits and safety island external fault control strategy；
Step SS3：When power system frequency or electric voltage exception, safety island off-the-line strategy is executed, by the safety island from electric power
Solution is listed in system, prevents electric system full cut-off；Multiple safety islands by the way that different frequency, voltage and delay definite value is arranged,
Realize sequentially off-the-line.
2. the construction method on power system security island according to claim 1, which is characterized in that in the step SS1
The clear safety island contact with foreign countries section specifically includes：Under normal operation, the unit output in the safety island is controlled
It is suitable with load level, that is, keep the safety island contact with foreign countries section close to zero trend.
3. the construction method on power system security island according to claim 1, which is characterized in that in the step SS2
The safety island internal fault control strategy specifically comprises the following steps：
Step SS21：Inside certain safety island after unit tripping, if safety island internal load size PL| with loss unit output PG
Deviation in permissible range PsetIt is interior, i.e., | PG-PL|<Pset then only cuts off the load of respective volume inside safety island；Otherwise,
Load is preferably cut off in entire electric system inner tissue, wherein the electric system of the preferred excision load of tissue includes safety island,
Not comprising other safety islands；
Step SS22：Certain safety island internal load tripping after, if the safety island inside unit output with lose payload it is inclined
Difference then only cuts off the unit of respective volume inside safety island in permissible range Pset；Otherwise, the group in entire electric system
Knit preferred excision unit, wherein the electric system of the preferred excision unit of tissue includes safety island, does not include other safety islands.
4. the construction method on power system security island according to claim 1, which is characterized in that in the step SS2
The safety island external fault control strategy specifically includes：After unit or load trip outside safety island, inside each safety island
Load and unit are not involved in stability contorting, i.e., only preferably cut off load or excision unit in safety island outside organization.
5. the construction method on power system security island according to claim 1, which is characterized in that in the step SS3
When the power system frequency exception, executes safety island off-the-line strategy and specifically comprise the following steps：As power system frequency f>
fhsetOr power system frequency f<flset, and the deviation of safety island inside unit output and payload is in permissible range PsetIt is interior,
Delay time t>Allowed time range tset, tripping safety island contact with foreign countries section, by safety island, solution is listed from electric system
Come, prevents electric system full cut-off；Wherein, flsetMore than the definite value of the low cut load first round, fhsetLess than high cut unit
The definite value of the first round.
6. the construction method on power system security island according to claim 1, which is characterized in that in the step SS3
When the power system voltage exception, executes safety island off-the-line strategy and specifically comprise the following steps：As voltage U in safety island>
UhsetOr U<Ulset, and the deviation of safety island inside unit output and payload is in permissible range PsetIt is interior, delay time t>Hold
Perhaps time range tset, tripping safety island contact with foreign countries section, by safety island, solution is listed from electric system, prevents power train
System full cut-off, UlsetMore than the definite value that low pressure cuts off the load first round, UhsetLess than the definite value of the high cut unit first round.
7. the control system on power system security island, which is characterized in that including controlling dress outside safety island inner controller, safety island
It sets, communication interface, the safety island inner controller outside the communication interface and the safety island by controlling dress
Set communication connection.
8. the control method of the control system using the power system security island described in claim 7, which is characterized in that including such as
Lower step：
Step S1：Control device outside safety island inner controller and safety island is configured in safety island, is controlled in the safety island
The power of the assembling unit, load power in device acquisition safety island, safety island contact with foreign countries section tidal current, the interior control dress of the safety island
Set acquisition busbar voltage and power, the power of the assembling unit of the outer outer electric system of control device acquisition safety island of the safety island, load
Power；When safety island contact with foreign countries section, which sends out trend, runs off dead zone, the safety island inner controller sends out instruction to machine
Group lowers unit output in safety island；When safety island contact with foreign countries section by it is after the fashion run off dead zone when, the safety island internal control
Device processed sends out instruction to unit, unit output in safety island is raised, until safety island contact with foreign countries section tidal current is in dead zone model
In enclosing；Wherein, the setting of dead band value is adjusted according to specific power grid；
Step S2：When the safety island inner controller, which is sentenced, unit or load tripping, controlled according to safety island internal fault
Strategy is controlled, and is specifically comprised the following steps：Step S21：Inside certain safety island after unit tripping, if negative inside the safety island
Lotus size PL| with loss unit output PGDeviation in permissible range PsetIt is interior, i.e., | PG-PL|<Pset then only cuts off safety island
The load of internal respective volume；Otherwise, load is preferably cut off in entire electric system inner tissue, wherein the preferred excision of tissue is negative
The electric system of lotus includes safety island, does not include other safety islands；Step S22：After the tripping of certain safety island internal load, if should
The deviation of unit output and loss payload then only cuts off phase inside safety island in permissible range Pset inside safety island
Answer the unit of capacity；Otherwise, unit is preferably cut off in entire electric system inner tissue, wherein the electricity of the preferred excision unit of tissue
Force system includes safety island, does not include other safety islands；
Step S3：When outside safety island control device sentence unit or load and trip when, according to safety island external fault control strategy
It is controlled, is specifically included：After unit or load trip outside safety island, load and unit inside each safety island are not involved in surely
Fixed control only preferably cuts off load or excision unit in safety island outside organization；And safety island inner controller is latched, and is not connect
By any excision load or unit order；
Step S4：Sentence when safety island inner controller and power system frequency exception, and meet power system frequency exception, executes
When the criterion of safety island off-the-line strategy, i.e., as power system frequency f>fhsetOr power system frequency f<flset, and inside safety island
The deviation of unit output and payload is in permissible range PsetIt is interior, delay time t>Allowed time range tset, tripping safety island
Contact with foreign countries section, by safety island, solution is listed from electric system, prevents electric system full cut-off；Wherein, flsetMore than low frequency
Cut off the definite value of the load first round, fhsetLess than the definite value of the high cut unit first round, then safety island inner controller outlet
The tripping safety island contact with foreign countries section all switchs；Sentence when safety island inner controller and power system voltage exception, and is full
Sufficient power system voltage is abnormal, when executing the criterion of safety island off-the-line strategy, i.e., as voltage U in safety island>UhsetOr U<Ulset,
And the deviation of safety island inside unit output and payload is in permissible range PsetIt is interior, delay time t>Allowed time range
tset, tripping safety island contact with foreign countries section, by safety island, solution is listed from electric system, prevents electric system full cut-off, Ulset
More than the definite value that low pressure cuts off the load first round, UhsetLess than the definite value of the high cut unit first round, then control in safety island
The device outlet tripping safety island contact with foreign countries section all switchs.
9. the control method on power system security island according to claim 8, which is characterized in that the step S1 is also wrapped
It includes：The distributed monitoring control system or number that the safety island inner controller is lowered or the instruction of up-regulation unit output passes through unit
Word electrohydraulic control system DEH is realized.
10. the control method on power system security island according to claim 8, which is characterized in that the step S2 is also wrapped
It includes：When only need to cutting off load in safety island inner tissue or when unit, tripping load or machine exported by safety island inner controller
Group switch；When needing to cut off outside safety island load or when unit, safety island external control sent instructions to by safety island inner controller
Device processed is switched by control device outlet tripping load or unit outside safety island.
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