CN108599244A - Power frequency change-based power grid island black start device and method - Google Patents
Power frequency change-based power grid island black start device and method Download PDFInfo
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- CN108599244A CN108599244A CN201810398509.4A CN201810398509A CN108599244A CN 108599244 A CN108599244 A CN 108599244A CN 201810398509 A CN201810398509 A CN 201810398509A CN 108599244 A CN108599244 A CN 108599244A
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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Abstract
The invention discloses a power grid island black start device and a method based on power frequency change, wherein the power grid island black start device comprises a connecting line, an acquisition unit and a protection device; the control switch is arranged on the connecting line and used for connecting the small unit system and the infinite equivalent system; the acquisition unit is connected with the connecting line and is used for measuring the frequency at two sides of the connecting line and transmitting the measured value to the protection device; and the protection device is used for disconnecting the control switch to enable the small unit system and the infinite equivalent system to be disconnected and operated with auxiliary power when the frequency and the change rate thereof meet the action criterion of the protection device, so as to prepare for starting the main power plant. The method is a starting method using the power grid island black-start device. The invention has the characteristic of good quick start, can reduce the investment cost of a black start device, greatly shortens the recovery time of a power grid, and reduces economic loss and social influence.
Description
Technical field
The present invention relates to power grid"black-start" technical fields, and in particular to a kind of power grid isolated island based on work frequency variation is black
Starter and method.
Background technology
Recently as the continuous increase of major regional power grid scale and capacity, the contact between system is increased, electricity
The safe and stable operation of Force system subjects huge test.Although metropolitan grid structure and safety and stability level are more previous
When having large increase, but meeting with catastrophe failure, it is possible to causing the chain reaction of system, large-area power-cuts is eventually led to
Accident.The major accidents such as the beautiful ash moss of in August, 2003 have beaten alarm bell to power worker, and people is made to be fully recognized that greatly
The diversity and unpredictability of safety at power cut.Once and accident occurs, and takes suitable effective black starting-up prediction scheme can be most
Make system resumes power in the short time, the accident of substantially reducing brings the harmful effect of economy and society.For modern city electricity
For net, general hydroelectric resources is more deficient, selects self-starting gas turbine then to be invested as black start source larger.Therefore having must
Study a kind of new black starting-up pattern.
Invention content
The present invention is directed to solve the technical problems existing in the prior art at least to some extent, propose a kind of based on work
The power grid isolated island black starting-up device and method of frequent rate variation, has the characteristics of good quick startup, can reduce black open
The cost of investment of dynamic device, improves the practicability and economic benefit of black starting-up device.
In order to realize the object of the invention, according to a first aspect of the present invention, the embodiment of the present invention provides a kind of based on power frequency frequency
The power grid isolated island black starting-up device of rate variation, specifically uses following technical scheme：
The power grid isolated island black starting-up device includes interconnection, collecting unit and protective device；It is arranged on the interconnection
There is control to switch, is used to connect the valve systems such as small machine set system and infinity；The collecting unit is connect with the interconnection,
It is used to measure the frequency of the interconnection both sides and by transmitting measured values to the protective device；The protective device is used for
When the frequency and its change rate meet protective device operating criterion, disconnects the control and switch and make small machine set system and infinite
Big equivalence system sectionalizing and house load operation are prepared to start power plant of the main force.
Optionally, the collecting unit includes isolated island side mutual inductor and big system side mutual inductor, isolated island side mutual inductor,
Protective device and big system side mutual inductor are sequentially connected, and isolated island side mutual inductor connects with interconnection close to small machine set system side
It connects, the big system side mutual inductor is connect with interconnection close to the valve systems such as infinity side.
Optionally, the control switch includes first switch and the second switch, and the first switch is close to the isolated island side
The junction of mutual inductor and interconnection is arranged, and the second switch is close to the junction of big the system side mutual inductor and interconnection
Setting.
Optionally, the protective device is connect by signal wire to survey the frequency of isolated island side with isolated island side mutual inductor
Magnitude f1 is transmitted to the protective device, and the protective device is connect with the big system side mutual inductor by signal wire, will
The frequency measurement f2 of big system side is transmitted to the protective device.
Optionally, the operating criterion includes：
When the frequency fluctuation of the frequency measurement f2 of the frequency measurement f1 and big system side of isolated island side exceeds the frequency of setting
When rate fluctuation range, the control switch is disconnected after the t times that are delayed, wherein t is time-delay action；Or the frequency in isolated island side
The frequency fluctuation of rate measured value f1 and the frequency measurement f2 of big system side is without departing from the frequency fluctuation range of setting, and the two
Change rate Δ f1/ Δ t and Δ f2When/Δ t is beyond the limitation set, the control switch is disconnected.
In order to realize the object of the invention, as same inventive concept, according to a second aspect of the present invention, the embodiment of the present invention is also
A kind of power grid isolated island black-start method changed based on work frequency is provided comprising described in preceding embodiment based on power frequency frequency
The power grid isolated island black starting-up device of rate variation, described method includes following steps：
(1) collecting unit measures the frequency of the interconnection both sides, and frequency measurement is transmitted to the protection
Device；
(2) protective device receives the frequency measurement, and judges that the frequency and its change rate Δ f/ Δs t meet
When operating criterion, protection enters time delay process, while determining in system whether there is catastrophe or failure, if stopped really
Electrification or time delay process terminate not yet to determine system mode, then protection act, the valve systems solution such as small machine set system and infinity
Simultaneously house load operation is arranged, is prepared to start power plant of the main force；The frequency and its change rate Δ f/ Δ t measured values do not meet dynamic
When making criterion, small machine set system is incorporated into the power networks.
Optionally, the step (1) specifically includes：Isolated island side inductor measures the interconnection and the small unit
The frequency f1 of system connection side is simultaneously transmitted to the protective device by signal wire；Described in the big system side inductor measures
Interconnection connect the frequency f2 of side with valve systems such as the infinities and is transmitted to the protective device by signal wire.
Optionally, the step (2) specifically includes：
Judge whether the frequency fluctuation of the frequency measurement f1 of the isolated island side and frequency measurement f1 of big system side exceeds to set
Fixed frequency fluctuation range；
When the frequency fluctuation range beyond setting, the control switch is disconnected after the t times that are delayed, wherein t is that delay is dynamic
Make the time；
When the frequency fluctuation range without departing from setting, the change rate Δ f of the two is judged1/ Δ t and/or Δ f2Whether/Δ t surpasses
Go out the limit value of setting；
When beyond setting limit value, the control switch is disconnected；
When without departing from setting limit value, small machine set system is incorporated into the power networks.
Optionally, as Δ f1/ Δ t and/or Δ f2When/Δ t is beyond setting limit value, it is delayed after the t times, disconnects the control
Switch.
Compared with prior art, implement system and method for the embodiment of the present invention to have the advantages that：
Garbage power plant Deng Fei main forces unit may be used using interconnection both sides frequency in the small machine set system of the embodiment of the present invention
Rate and its change rate to determine whether according to plan Active Splitting formed isolated island, recycle the isolated island carry out black starting-up, relative to biography
For black starting-up mode of uniting, the economic cost of black starting-up device is significantly reduced, while having the advantages that good quickly startup.
If after mains breakdown, part of generating units can realize self-insurance station service and maintain generator synergic system, then can carry out immediately
Power supply is directly powered toward power grid by these units, and the rapid power demand for solving key sector and gradually expansion restore range,
To greatly shorten the power system restoration time, reduce economic loss and social influence.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Obtain other attached drawings according to these attached drawings.
Fig. 1 is power grid isolated island black starting-up apparatus structure schematic diagram provided in an embodiment of the present invention；
Fig. 2 is isolated island start-up mode black starting-up flow chart provided in an embodiment of the present invention；
Fig. 3 is power grid isolated island black-start method flow chart provided in an embodiment of the present invention.
Specific embodiment
In being described below, for illustration and not for limitation, it is proposed that such as tool of particular system structure, technology etc
Body details understands the embodiment of the present invention to cut thoroughly.However, it will be clear to one skilled in the art that there is no these specific
The present invention can also be realized in the other embodiments of details.In other situations, it omits to well-known system, device, electricity
The detailed description of road and method, in case unnecessary details interferes description of the invention.
In order to illustrate technical solutions according to the invention, illustrated below by specific embodiment combination attached drawing.
The embodiment of the present invention provides a kind of power grid isolated island black starting-up device changed based on work frequency, is applied to power grid
The fast recovery of power supply of system, voltage difference of the conventional isolated island off-the-line protection generally using default between isolated island and system, phase angle difference,
Difference on the frequency etc. is used as operating criterion, and the power grid isolated island black starting-up device of the embodiment of the present invention is based on work frequency change and is turned to move
Make criterion, and garbage power plant is present among each big city for general at present.In contrast, the isolated island start-up mode of garbage power plant is thrown
Money is smaller, is a kind of new black starting-up pattern.On the basis of practical operating experiences, the present embodiment is using garbage power plant as lonely
Island unit, but isolated island unit is not limited to garbage power plant, can also be other non-main force's units, and propose technology in detail below
Scheme：
As shown in Figure 1, in one embodiment, the power grid isolated island black starting-up device include interconnection, collecting unit and
Protective device；It is provided with control switch on the interconnection, is used to connect the valve systems such as small machine set system and infinity, this is small
Machine set system is isolated island machine set system, the equivalent system of infinity for bulk power grid equal valve systems；The collecting unit with it is described
Winding thread connects, and is used to measure the frequency of the interconnection both sides and by transmitting measured values to the protective device；The protection
Device is used for when the frequency and its change rate meet protective device operating criterion, is disconnected the control and is switched so that small unit
System and infinitely great equivalent system sectionalizing and house load operation, prepare to start power plant of the main force.Network system is disturbed
When, the frequency of the interconnection between bulk power system and islanded system can fluctuate, therefore technical staff can be according to practical work
Make experience, technology requires and target setting frequency and its change rate protective device when meeting which kind of condition act, therefore this reality
It applies in example and the operating criterion is not defined.
Wherein, if it is desired to which unit can become isolated island by Active Splitting when accident may occur, it is contemplated that practicability and warp
Ji benefit, should select non-main force's unit that capacity is small, can not be incorporated into the power networks.By taking the burning power plant of Shenzhen South Mountain as an example, hair
Motor is a two pole synchronous generator of QF-12-2 types three-phase alternating current, rated power 12MW, single machine maximum output 15MW, volume
Constant voltage 10.5kV.It can pass through interconnection with bulk power grid paired running or islet operation in the case where catastrophe occurs for power grid
Station service can be provided for neighbouring gas turbine unit, auxiliary gas turbine is started, to carry out further system
Restore.The investment that large-sized diesel generating set is equipped with for gas turbine can be saved in this way, and it is fireballing to be likewise supplied with startup
Feature.
Wherein, isolated island, which starts, is used as a kind of black starting-up pattern, it is desirable that isolated network under any circumstance being capable of stable operation.This
It also means that if setting up isolated island in entire electric system starts scheme, when any catastrophe, failure occurs in bulk power system
Or when disturbance, unit and catastrophe system sectionalizing are formed into isolated island by protection and automatic device by prior scheduled mode.If problem
Solve, then by isolated island again with bulk power grid paired running；Further restored by the isolated island if having a power failure on a large scale,
It is as shown in Figure 2 that it restores flow.
Mini system side voltage data is obtained as shown in Figure 2, this side is transmitted in isolated island device through communication channel to side data
In handled.The active solution of the small unit in big system jam and catastrophe can be realized using isolated island protective device
Row.By the measurement of the frequency parameter of interconnection both sides between small unit and big system, to constitute the original of protective device action
Reason and basis for estimation, when the frequency of measurement and its change rate meet operating criterion, protection enters time delay process, and delay time is
T, while determining in system whether there is catastrophe or failure.If power outage occurs really, or delay end is not yet true
Determine system mode, then protection act, small unit and big system sectionalizing and house load operation are prepared to start power plant of the main force；
If large-scale blackout does not occur or system restores stable operation again, protection is failure to actuate, and small unit continues grid-connected
Operation.
As can be seen from the above description, power grid isolated island black starting-up device described in the present embodiment has the good spy quickly started
Point can reduce the cost of investment of black starting-up device, improve the practicability and economic benefit of black starting-up device.
In one embodiment, the collecting unit includes isolated island side mutual inductor and big system side mutual inductor, the isolated island
Side mutual inductor, protective device and big system side mutual inductor are sequentially connected, and isolated island side mutual inductor is with interconnection close to small unit
System side connects, for the frequency of the side of measurement interconnection；The big system side mutual inductor is with interconnection close to infinite
It is big to wait the connection of valve systems side, for the frequency of the other side of measurement interconnection.
Wherein, isolated island side mutual inductor and big system side mutual inductor are preferably voltage transformer, according to voltage transformer
The voltage of measurement, then corresponding frequency component can be extracted by Fourier algorithm.
In one embodiment, the control switch includes first switch and the second switch, and the first switch is close to institute
The junction for stating isolated island side mutual inductor and interconnection is arranged, and the second switch is close to the big system side mutual inductor and interconnection
Junction setting.The first switch and the second switch can select killer switch either breaker and disconnecting switch
Tandem compound switchs, and first switch can correspond to isolated island side mutual inductor, the frequency f1 and its change that mutual inductor detects when isolated island side
When rate meets criterion, first switch off-the-line isolated island is disconnected；Second switch can correspond to big system side mutual inductor, when big system side
When the frequency f2 and its change rate that mutual inductor detects meet criterion, second switch off-the-line isolated island is disconnected, is jumped to improve switch
Unwind the response speed of row isolated island.
In one embodiment, the protective device is connect with isolated island side mutual inductor by signal wire, the protection
Device is connect with the big system side mutual inductor by signal wire.Fiber optic cables can be selected but be not limited to the signal wire,
The frequency of measurement is transmitted to protective device by signal wire.
For the stability for ensureing after isolated island black start source off-the-line, it is necessary to ensure that automatic device is in the system that detects and default orphan
When island both ends frequency is more abnormal, Active Splitting device should be as fast as possible by isolated island and system sectionalizing.Therefore, in a reality
It applies in example, the operating criterion includes
Judge whether the frequency fluctuation of the frequency measurement f1 of the isolated island side and frequency measurement f1 of big system side exceeds to set
Fixed frequency fluctuation range；
When the frequency fluctuation range beyond setting, the control switch is disconnected after the t times that are delayed, wherein t is that delay is dynamic
Make the time；
When the frequency fluctuation range without departing from setting, the change rate Δ f of the two is judged1/ Δ t and Δ f2Whether/Δ t exceeds
The limit value of setting；
It when beyond setting limit value, is delayed after the t times, disconnects the control switch；
When without departing from setting limit value, small machine set system is incorporated into the power networks.
It should be noted that the specific time of t can also determine according to other modes, such as according to protective device and it is
Operating experience of uniting statistics determines a specific value.
The embodiment of the present invention uses order wire frequency change rate between isolated island and system to constitute inverse time-lag protection for operating criterion,
Realize quick off-the-line.When system is disturbed, flowing through the frequency of the interconnection between big system and isolated island mini system can fluctuate,
Using the protection of order wire frequency change rate Δ f/ Δs t, then it can shorten the time of protection reaction, it can be to avoid using overcurrent protection
Generator outage caused by reaction time longer possibility, realizes fast reaction off-the-line.
In addition, the embodiment of the present invention also provides a kind of power grid isolated island black-start method changed based on work frequency, packet
The power grid isolated island black starting-up device changed based on work frequency described in preceding embodiment is included, described method includes following steps：
(1) collecting unit measures the frequency of the interconnection both sides, and frequency measurement is transmitted to the protection
Device；
(2) protective device receives the frequency measurement, and judges that the frequency and its change rate Δ f/ Δs t meet
When operating criterion, protection enters time delay process, while determining in system whether there is catastrophe or failure, if stopped really
Electrification or time delay process terminate not yet to determine system mode, then protection act, the valve systems solution such as small machine set system and infinity
Simultaneously house load operation is arranged, is prepared to start power plant of the main force；The frequency change rate Δ f/ Δ t measured values do not meet action and sentence
According to when, small machine set system is incorporated into the power networks.The embodiment of the present invention use between isolated island and system order wire frequency change rate Δ f/ Δs t for
Operating criterion constitutes protection, realizes quick off-the-line.When system is disturbed, the interconnection between big system and isolated island mini system is flowed through
Frequency can fluctuate, using order wire frequency change rate Δ f/ Δs t judgement protect, then can shorten protection reaction when
Between, realize fast reaction off-the-line.
Further, in one embodiment, the step (1) specifically includes：Described in isolated island side inductor measures
Interconnection connect the frequency of side with the small machine set system and is transmitted to the protective device by signal wire；The big system
Side inductor measures the valve systems such as the interconnection and the infinity and connect the frequency of side and be transmitted to institute by signal wire
State protective device.
Further, in one embodiment, the step (2) specifically includes：
Judge whether the frequency fluctuation of the frequency measurement f1 of the isolated island side and frequency measurement f2 of big system side exceeds to set
Fixed frequency fluctuation range；
When the frequency fluctuation range beyond setting, the control switch is disconnected after the t times that are delayed, wherein t is that delay is dynamic
Make the time；
When the frequency fluctuation range without departing from setting, the change rate Δ f of the two is judged1/ Δ t and/or Δ f2Whether/Δ t surpasses
Go out the limit value of setting；
When beyond setting limit value, the control switch is disconnected；
When without departing from setting limit value, small machine set system is incorporated into the power networks.
Preferably, as Δ f1/ Δ t and/or Δ f2When/Δ t is beyond setting limit value, it can be delayed after the t times, then disconnect institute
State control switch.
The present embodiment method constitutes Active Splitting using frequency discontinuity amount Δ f and Δ f/ Δ t the ≈ df/dt of network system
Operating criterion.It is more acutely and aobvious when the failure and catastrophe performance characteristic of the big system of urban distribution network are than General System oscillation step-out
It writes, system synchronization standard in higher sensitivity can be introduced, that is, utilize the inspection synchronous device arranged side by side on interconnection inversely to use, have
Obtained interconnection both sides frequency Δ f and frequency discontinuity amount Δ f/ Δs t ≈ df/dt can be compared by body with detection unit,
Can differentiate it is whether synchronous with network, to determine a need for off-the-line.
Specifically, protective device includes by the timer of computation delay time and by calculating based on frequency change rate
Unit is calculated, the step flow of the power grid isolated island black-start method changed based on work frequency is described in detail below, such as Fig. 3
It is shown：
(1) instantaneous working frequency is read in respectively in isolated island side and the big system side of power grid；
(2) two judgements are carried out to reading in frequency f1 and f2, i.e., whether exceeds normal frequency fluctuation (± 3Hz), two frequencies
Whether difference is beyond the range run simultaneously between rate；If within the scope of normal frequency, the frequency variation of two side systems is detected
Rate Δ f1/ Δ t and Δ f2Whether/Δ t is out-of-limit.It is unsatisfactory for if any any one, the delay being put into before isolated island device action is prolonged
When the time be t；
(3) meet criterion, when timing, which reaches, to be delayed, the tripping of isolated island device action, and reset timer.
As can be seen from the above description, implement system and method for the embodiment of the present invention to have the advantages that：
Garbage power plant Deng Fei main forces unit may be used using interconnection both sides frequency in the small machine set system of the embodiment of the present invention
Rate and its change rate to determine whether according to plan Active Splitting formed isolated island, recycle the isolated island carry out black starting-up, relative to biography
For black starting-up mode of uniting, the economic cost of black starting-up device is significantly reduced, while having the advantages that good quickly startup.
If after mains breakdown, part of generating units can realize self-insurance station service and maintain generator synergic system, then can carry out immediately
Power supply is directly powered toward power grid by these units, and the rapid power demand for solving key sector and gradually expansion restore range,
To greatly shorten the power system restoration time, reduce economic loss and social influence.
Part not deployed in devices and methods therefor in the embodiment of the present invention can refer to device and its side of above example
The corresponding part of method, is no longer developed in details herein.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " illustrative examples ",
The description of " example ", " specific example " or " some examples " etc. mean the specific features described in conjunction with the embodiment or example,
Structure, material or feature are included at least one embodiment or example of the invention.In the present specification, to above-mentioned term
Schematic representation may not refer to the same embodiment or example.Moreover, description specific features, structure, material or
Feature can be combined in any suitable manner in any one or more of the embodiments or examples.
Any process described otherwise above or method description are construed as in flow chart or herein, and expression includes
It is one or more for realizing specific logical function or process the step of executable instruction code module, segment or portion
Point, and the range of the preferred embodiment of the present invention includes other realization, wherein sequence that is shown or discussing can not be pressed,
Include according to involved function by it is basic simultaneously in the way of or in the opposite order, to execute function, this should be by the present invention's
Embodiment person of ordinary skill in the field is understood.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changes, replacing and modification.
Claims (9)
1. a kind of power grid isolated island black starting-up device based on work frequency variation, which is characterized in that including interconnection, collecting unit
And protective device；It is provided with control switch on the interconnection, is used to connect the valve systems such as small machine set system and infinity；Institute
It states collecting unit to connect with the interconnection, is used to measure the frequency of the interconnection both sides and by transmitting measured values to described
Protective device；The protective device is used for when the frequency and its change rate meet protective device operating criterion, described in disconnection
Control switch does standard so that small machine set system and infinitely great equivalent system sectionalizing and house load operation to start power plant of the main force
It is standby.
2. the power grid isolated island black starting-up device as described in claim 1 based on work frequency variation, which is characterized in that described to adopt
It includes isolated island side mutual inductor and big system side voltage transformer, isolated island side mutual inductor, protective device and big system to collect unit
Side mutual inductor is sequentially connected, and isolated island side mutual inductor is connect with interconnection close to small machine set system side, the big system side
Mutual inductor is connect with interconnection close to the valve systems such as infinity side.
3. the power grid isolated island black starting-up device as claimed in claim 2 based on work frequency variation, which is characterized in that the control
System switch includes first switch and the second switch, and the first switch is close to the junction of isolated island side mutual inductor and interconnection
Setting, the second switch are arranged close to the junction of the big system side mutual inductor and interconnection.
4. the power grid isolated island black starting-up device as claimed in claim 2 based on work frequency variation, which is characterized in that the guarantor
Protection unit is connect by signal wire the frequency measurement f1 of isolated island side is transmitted to the protection with isolated island side mutual inductor
Device, the protective device is connect with the big system side mutual inductor by signal wire, by the frequency measurement of big system side
F2 is transmitted to the protective device.
5. the power grid isolated island black starting-up device as described in claim 1 based on work frequency variation, which is characterized in that described dynamic
Include as criterion：
When the frequency fluctuation of the frequency measurement f2 of the frequency measurement f1 and big system side of isolated island side exceeds the frequency wave of setting
When dynamic range, the control switch is disconnected after the t times that are delayed, wherein t is time-delay action；Or the frequency in isolated island side is surveyed
The frequency fluctuation of magnitude f1 and the frequency measurement f2 of big system side are without departing from the frequency fluctuation range of setting, and the variation of the two
Rate Δ f1/ Δ t and Δ f2When/Δ t is beyond the limitation set, the control switch is disconnected.
6. a kind of startup method of power grid isolated island black starting-up device as described in claim 1 comprising as described in claim 1
Power grid isolated island black starting-up device, which is characterized in that described method includes following steps：
(1) collecting unit measures the frequency of the interconnection both sides, and frequency measurement is transmitted to the protective device；
(2) protective device receives the frequency measurement, and judges the frequency and its action of change rate Δ f/ Δ t satisfactions
When criterion, protection enters time delay process, while determining in system whether there is catastrophe or failure, if power failure thing occurs really
Therefore or time delay process terminate not yet to determine system mode, then protection act, small machine set system with infinitely great equivalent system sectionalizing simultaneously
House load operation is prepared to start power plant of the main force；The frequency and its change rate Δ f/ Δ t measured values do not meet action and sentence
According to when, small machine set system is incorporated into the power networks.
7. starting method as claimed in claim 6, which is characterized in that the step (1) specifically includes：Isolated island side inductance
Device measures the interconnection and connect the frequency f1 of side with the small machine set system and be transmitted to the protection dress by signal wire
It sets；The big system side inductor measures the valve systems such as the interconnection and the infinity and connect the frequency f2 of side and pass through
Signal wire is transmitted to the protective device.
8. starting method as claimed in claim 7, which is characterized in that the step (2) specifically includes：
Judge the frequency fluctuation of the frequency measurement f1 of the isolated island side and frequency measurement f1 of big system side whether beyond setting
Frequency fluctuation range；
When the frequency fluctuation range beyond setting, the control switch is disconnected after the t times that are delayed, when wherein t is deferred action
Between；
When the frequency fluctuation range without departing from setting, the change rate Δ f of the two is judged1/ Δ t and/or Δ f2Whether/Δ t, which exceeds, sets
Fixed limit value；
When beyond setting limit value, the control switch is disconnected；
When without departing from setting limit value, small machine set system is incorporated into the power networks.
9. starting method as claimed in claim 8, which is characterized in that as Δ f1/ Δ t and/or Δ f2/ Δ t is beyond setting limit value
When, it is delayed after the t times, disconnects the control switch.
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