CN107591798A - The security and stability appraisal procedure of island network - Google Patents
The security and stability appraisal procedure of island network Download PDFInfo
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- CN107591798A CN107591798A CN201710731108.1A CN201710731108A CN107591798A CN 107591798 A CN107591798 A CN 107591798A CN 201710731108 A CN201710731108 A CN 201710731108A CN 107591798 A CN107591798 A CN 107591798A
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- 238000000034 method Methods 0.000 title claims abstract description 39
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 66
- 239000011707 mineral Substances 0.000 claims abstract description 66
- 238000003723 Smelting Methods 0.000 claims abstract description 37
- UGKDIUIOSMUOAW-UHFFFAOYSA-N iron nickel Chemical compound [Fe].[Ni] UGKDIUIOSMUOAW-UHFFFAOYSA-N 0.000 claims abstract description 37
- 238000004458 analytical method Methods 0.000 claims abstract description 9
- 238000004088 simulation Methods 0.000 claims abstract description 8
- 230000008569 process Effects 0.000 claims description 7
- 238000013097 stability assessment Methods 0.000 abstract description 3
- 230000001737 promoting effect Effects 0.000 abstract description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 14
- 230000004044 response Effects 0.000 description 14
- 229910000863 Ferronickel Inorganic materials 0.000 description 8
- 229910052759 nickel Inorganic materials 0.000 description 7
- 240000002853 Nelumbo nucifera Species 0.000 description 6
- 235000006508 Nelumbo nucifera Nutrition 0.000 description 6
- 235000006510 Nelumbo pentapetala Nutrition 0.000 description 6
- 238000005520 cutting process Methods 0.000 description 5
- 230000005611 electricity Effects 0.000 description 5
- 230000006641 stabilisation Effects 0.000 description 3
- 238000011105 stabilization Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000011217 control strategy Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000010977 unit operation Methods 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000009514 concussion Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 235000012054 meals Nutrition 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000005619 thermoelectricity Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
The present invention relates to island network stability assessment technical field, particularly a kind of security and stability appraisal procedure of nickel-iron smelting factory island network.Isolated network model is built in simulation software according to the topological structure of nickel-iron smelting factory island network, unit output and load boundary value are determined according to the installed capacity of nickel-iron smelting factory island network and total load amount, four kinds of limiting conditions under two dimensions are determined according to unit output and load boundary value, stable property simulation analysis are carried out to isolated network model under four kinds of limiting conditions, when can then illustrating that nickel-iron smelting factory island network can be with safe and stable operation under current installed capacity and total load amount with safe and stable operation under four kinds of limiting conditions.The island network that this method is contributed to load containing mineral hot furnace and blower fan first carries out security and stability control analysis with RTDS, has good promotional value and application prospect.
Description
Technical field
The present invention relates to island network stability assessment technical field, particularly a kind of security and stability of island network is commented
Estimate method.
Background technology
South east asia is the core cooperation region of " Maritime Silk Road " in China's the Belt and Road strategy, and India Buddhist nun
Economy of the West Asia (hereinafter referred to as Indonesia) as Southeast Asia Maximum Population is the Belt and Road development in south east asia
Fulcrum country, and the rich in mineral resources such as Indonesia's ferronickel, are the important ferronickel importing countries in China.But from 2011, print
Buddhist nun government is the domestic employment of increase, limits the outlet of high-grade nickel ores, i.e. Indonesia exists substantial amounts of high-grade nickel ore resources
The country is by processing, then exports abroad, is controlled with improving trade of this country to ferronickel, this policy of Indonesia causes domestic steel
The predicament that enterprise cooks a meal without rice, the domestic ferronickel performance of enterprises substantially reduce.Therefore with China's the Belt and Road Overseas Strategy
Iterative method, Chinese nickel enterprise go to Indonesia's investment to found the factory, it is contemplated that will intend within 2017 establishing 6 RKEF techniques ferronickel enterprises in Indonesia
Industry, 17 blast furnace ferronickel enterprises, these will possess the ferronickel production capacity for producing 3000000 tons per year in the josephinite that print Chinese opens up,
The domestic deficiency to ferronickel demand is compensated for.
Indonesia has high-grade lateritic nickel ore, but most of nickel minerals is used away from urban district or on island in factory
Electricity, which turns into, to be most difficult to solve the problems, such as, and Indonesia's power network system is weak, and the 50% of normal residential electricity consumption not yet meets, allows power network to provide
The commercial power of nickel minerals is even more not within the foreseeable future.Therefore ore deposit factory is established in Indonesia, it is necessary to consider to build power plant, and realize electric in ore deposit factory
Can self-centered island network system.But the general capacity of island network is smaller, the ratio of general power shared by each large-scale electric equipment
Weight is larger, and the disturbance quantity relative value of load is also just larger, and load fluctuation process will produce more tight to the frequency of isolated network and voltage
The influence of weight, and the frequent fluctuation of load most likely results in the unstability of isolated network.Main large capacity equipment is ore deposit heat in ore deposit factory
Stove and rolling mill, because of the technological process requirement of production, the power swing of its equipment is relatively frequent and fluctuation amplitude is higher, if isolated network system
System less stable, the unstability easily under limiting condition, influences the power supply of whole ore deposit factory.
At present, for the safety and stability evaluation of nickel-iron smelting factory island network, there has been no the method for maturation, most of patent
It is that stability strategy is proposed to existing isolated network, and does not account for influence of the impact load to isolated network, more rarely has document to proposed
Isolated network proposes stable control appraisal procedure, even, fluctuates big island network for all output unit outputs and load,
There is no a kind of effective method, accurate security and stability assessment can be carried out to it.
The content of the invention
In order to solve the above technical problems, it is an object of the invention to provide a kind of accuracy height and for all output machines
The security and stability appraisal procedure of the applicable island network of big island network is fluctuated in group output and load.
For a kind of security and stability appraisal procedure of island network of the present invention, its technological means used for：
Isolated network model is built in simulation software according to the topological structure of nickel-iron smelting factory island network, according to nickel-iron smelting
The installed capacity of factory's island network and total load amount determine unit output and load boundary value, according to unit output and load border
Value determines four kinds of limiting conditions under two dimensions, and stable property simulation analysis are carried out to isolated network model under four kinds of limiting conditions,
When can then illustrating nickel-iron smelting factory island network in current installed capacity and total with safe and stable operation under four kinds of limiting conditions
Can be with safe and stable operation under load capacity.
Further, four kinds of limiting conditions are respectively：Unit output high load capacity is horizontal high, unit output high load capacity water
Flat low, unit output low load levels are low, these four limiting conditions of unit output low load levels height.
Further, the unit output boundary value is the boundary value that blower fan is contributed, the boundary value root of the blower fan output
It is determined according to fan capacity.
Further, the load boundary value is mineral hot furnace load boundary value, and the mineral hot furnace load boundary value includes ore deposit
Hot stove maximum load Qmax* n and mineral hot furnace minimum load Qmin*n。
Further, every mineral hot furnace maximum load QmaxDetermination method it is as follows：
In the case where not considering that blower fan is contributed, according to the total load of statistics gained, and station service in total load and
The accounting of public auxiliary load obtains mineral hot furnace total load W, and the load Q=W/n, n of every mineral hot furnace are the quantity of mineral hot furnace；
When blower fan reaches maximum installed capacity W1, mineral hot furnace highest total load W is obtainedmax, Wmax=W+W1, every ore deposit heat
Stove maximum load Qmax=Wmax/n。
Further, every mineral hot furnace minimum load QminDetermination method it is as follows：
Mineral hot furnace total load W when asking for being out of order according to the power swing amplitude lower limit P of statistics gainedmin, Wmin=Wmax*
P/n, every mineral hot furnace minimum load Qmin=Wmin/n。
Further, the simulation software is RTDS.
Further, it is described as follows to the stable property simulation analysis process of isolated network model progress under four kinds of limiting conditions：
Wherein under a limiting condition, tripping operation behaviour is carried out to the unit of EIAJ in nickel-iron smelting factory island network
Make, necessary stable measure then is implemented to nickel-iron smelting factory island network, if the frequency and electricity of nickel-iron smelting factory island network
Prescribed level can be returned to by being pressed in after implementing stable measure, then chooses another limiting condition and repeat this operation, until emulation
Terminate；
Wherein, if occurring the frequency of nickel-iron smelting factory island network and voltage under a certain limiting condition is implementing stable arrange
The phenomenon of prescribed level can not be still returned to after applying, then emulation terminates, and illustrates that nickel-iron smelting factory island network is working as frontloader
Unstable phenomenon is likely to occur under capacity and total load amount；
If under four kinds of limiting conditions, the frequency of nickel-iron smelting factory island network and voltage can be with after stable measure is implemented
Prescribed level is returned to, then emulation terminates, and illustrates nickel-iron smelting factory island network under current installed capacity and total load amount
Can be with safe and stable operation.
The beneficial effects of the invention are as follows：The island network that this method is contributed to load containing mineral hot furnace and blower fan first uses
RTDS carries out security and stability control analysis, has good promotional value and application prospect, such as to unit containing new energy and load
Larger isolated network is fluctuated to be applicable.Unit output fluctuation is influenceed synchronously to examine with load fluctuation on the safety and stability of isolated network
Consider, according to contributing and fluctuating situation, limiting condition of the system under running boundary is determined, when isolated network can be in finite number
Under limiting condition can stable operation, that is, illustrate under all operating modes that system is included inside limiting condition to stablize and transport
OK, isolated network is not in the phenomenon of unstability.According to stable situation of the isolated network under limiting condition, to peace of the isolated network in this border
Full stabilization is assessed, it is not necessary to carries out simulating, verifying, simple operation, and accuracy one by one to the situation under various operating conditions
It is high.And isolated network is emulated in the case of each limiting condition with RTDS, simulation result is more accurate.
Brief description of the drawings
Fig. 1 is the flow chart that limit of utilization operating mode scene of the present invention judges nickel-iron smelting factory island network security and stability.
Fig. 2 is the topological structure of nickel-iron smelting factory island network in the present invention.
Fig. 3 is the limiting condition typical examples that the present invention contributes according to blower fan and mineral hot furnace load boundary value is chosen.
Fig. 4 be the present invention using RTDS to isolated network in 135MW unit failures, be added without in the emulation carried out during stable measure
The voltage response curves of record.
Fig. 5 be the present invention using RTDS to isolated network in 135MW unit failures, be added without in the emulation carried out during stable measure
The frequency response curve of record.
Fig. 6 is that the present invention is maximum in blower fan output, and when mineral hot furnace load is in maximum, isolated network is existed using RTDS
135MW unit failures, the voltage response curves recorded in the emulation carried out when adding stable measure.
Fig. 7 is that the present invention is maximum in blower fan output, and when mineral hot furnace load is in maximum, isolated network is existed using RTDS
135MW unit failures, the frequency response curve recorded in the emulation carried out when adding stable measure.
Fig. 8 is that the present invention is maximum in blower fan output, and when mineral hot furnace load is in minimum value, isolated network is existed using RTDS
135MW unit failures, the voltage response curves recorded in the emulation carried out when adding stable measure.
Fig. 9 is that the present invention is maximum in blower fan output, and when mineral hot furnace load is in minimum value, isolated network is existed using RTDS
135MW unit failures, the frequency response curve recorded in the emulation carried out when adding stable measure.
Figure 10 is that the present invention is minimum in blower fan output, and when mineral hot furnace load is in minimum value, isolated network is existed using RTDS
135MW unit failures, the voltage response curves recorded in the emulation carried out when adding stable measure.
Figure 11 is that the present invention is minimum in blower fan output, and when mineral hot furnace load is in minimum value, isolated network is existed using RTDS
135MW unit failures, the frequency response curve recorded in the emulation carried out when adding stable measure.
Figure 12 is that the present invention is minimum in blower fan output, and when mineral hot furnace load is in maximum, isolated network is existed using RTDS
135MW unit failures, the voltage response curves recorded in the emulation carried out when adding stable measure.
Figure 13 is that the present invention is minimum in blower fan output, and when mineral hot furnace load is in maximum, isolated network is existed using RTDS
135MW unit failures, the frequency response curve recorded in the emulation carried out when adding stable measure.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.The specific embodiments described herein are merely illustrative of the present invention, is not used to limit
The fixed present invention.In addition, as long as technical characteristic involved in each embodiment of invention described below is each other
Conflict can is not formed to be mutually combined.
It is a kind of flow of the security and stability appraisal procedure of the high nickel-iron smelting factory island network of accuracy as shown in Figure 1
Figure, it comprises the following steps：
Step 1, the investigation of data early stage and model are established：The installed capacity of proposed vertical nickel-iron smelting factory is obtained (containing conventional
Unit and wind power generating set) and total load amount, the topological structure of collection nickel-iron smelting factory island network；Provided according to investigation
Material, builds isolated network model in simulation software.
It is illustrated in figure 2 the topological structure of nickel-iron smelting factory island network, the isolated electricity of the nickel-iron smelting factory in the present embodiment
Net is made up of 1~6#, six fired power generating units and 7# blower fans, and total installation of generating capacity 690MW, main loads are born by the station service in power plant
Lotus, the public auxiliary burden of steel mill and mineral hot furnace load three parts composition, total load capacity 600MW, wherein station service and
The accounting of public auxiliary load is 10%, and power swing amplitude lower limit P is 70%.
Step 2, determine that blower fan is contributed and mineral hot furnace loads bound (i.e. boundary value).In this project, generating set includes
Blower fan, it is larger that blower fan goes out fluctuation, and regular poor, and the main loads of nickel smelter are mineral hot furnace load, mineral hot furnace with
To be influenceed by technological process, its load fluctuation is larger, and fluctuation range is wider.If only individually blower fan is contributed or ore deposit is hot
When stove load single factors account for, pole occurs because considering that limiting case is not reasonable so as to causing border value parameter to be chosen
Mistake, so as to cause system when being run within boundary value, it is possible to there is the phenomenon of unstability, therefore, this method is simultaneously
Two aspect factors are taken into account.
Nickel-iron smelting factory island network in the present embodiment only includes a blower fan, and its installed capacity is up to 50MW, i.e.,
The boundary value that blower fan is contributed is respectively 135MW*4+50MW*2+50MW and 135MW*4+50MW*2.The thermoelectricity installed capacity of system
For 640MW, when not considering that the larger blower fan of fluctuation is contributed for the time being, 600MW load is born by station-service electric load, public auxiliary
Lotus and mineral hot furnace load composition, according to the accounting of station service and public auxiliary load, the load that can obtain mineral hot furnace is about W=
480MW, i.e. every mineral hot furnace load Q=W/n=480/8=60MW.When blower fan reaches maximum installed capacity W1=50MW, ore deposit
Hot stove highest total load Wmax=W+W1=480MW+50MW=530MW, therefore the peak load of every mineral hot furnace is set herein
QmaxFor 65MW.
And the minimum load of mineral hot furnace appear in electrode blow or collapse material when, according to statistics, mineral hot furnace load level drops
It is low to the 70% of former power, i.e. power swing amplitude lower limit P is 70%, and the minimum load of every mineral hot furnace is Qmin=Wmin/ n=
Wmax* the ≈ 45MW of P/n=530MW*70%/8.
Step 3, the determination of limiting condition scene：As shown in figure 3, the blower fan determined according to step 2 is contributed and mineral hot furnace is born
Bound is carried, carries out different boundary combinations, system fan is formed and contributes maximum (135MW*4+50MW*2+50MW), mineral hot furnace is born
Lotus is in maximum (65MW*8), system fan is contributed maximum (135MW*4+50MW*2+50MW), and mineral hot furnace load is in minimum
It is worth (45MW*8), system fan output minimum (135MW*4+50MW*2), mineral hot furnace load is in minimum value (45MW*8), system
Blower fan is contributed minimum (135MW*4+50MW*2), and mineral hot furnace load is in maximum (65MW*8) this four limiting condition scenes.
Step 4, the isolated network peace stability analysis under limiting condition scene.Fault generator is disconnected after steady-state operation 6s is set
Wire-outgoing breaker, that is, allow corresponding generator failure out of service, then postpone 0.2s after carry out, disconnect a number of ore deposit
The breaker at furnace load end, system is maintained at safety and stability level, and the frequency and voltage change of record system, finally divide
The response characteristic and corresponding control strategy of analysis system frequency and voltage.Fig. 4 and Fig. 5 is 135MW unit maintenances, and system is not adopted
Take the voltage and frequency response curve of stable measure.It can be seen that after cutting machine, system voltage and frequency can not all be maintained at permission
In the range of, system unstability.
In the step, implementing to pacify if occurring the frequency of nickel-iron smelting factory island network and voltage under a certain limiting condition
The phenomenon of prescribed level can not be still returned to after steady measure, then emulation terminates, and illustrates nickel-iron smelting factory island network current
Unstable phenomenon is likely to occur under installed capacity and total load amount；If under four kinds of limiting conditions, the frequency of nickel-iron smelting factory island network
Rate and voltage can return to prescribed level after stable measure is implemented, then emulation terminates, and illustrates that nickel-iron smelting factory isolates
Power network can be with safe and stable operation under current installed capacity and total load amount.
The specific simulation process of the present embodiment is as follows：
As shown in Figures 6 and 7, the method for operation of this example is that 6 fired power generating units are all run, and blower fan is contributed to be maximum
50MW, every mineral hot furnace are maximum 65MW.Fired power generating unit output and the parameter of reactive power compensator are adjusted first, make orphan
Net system is in steady operational status.After system is stable, rupturing capacity is the leading-out terminal breaker of 135MW unit, and prolongs
Cut away two mineral hot furnace loads after slow 0.2s, make system voltage and frequency retrieval in the range of permission.Because mineral hot furnace is born
Lotus voltage pulsation is larger, and frequency is higher, therefore voltage responsive is banding, and voltage is between 0.94pu and 1.055pu after cutting machine
Concussion, 1pu fluctuations nearby are dropped to after taking stable measure；System frequency cut it is minimum after machine drop to 49.6Hz, take stable
It is final stable after measure to be fluctuated in 50Hz or so, it is seen that under this limiting condition, cut off after maximum unit and take stable measure,
Voltage and frequency retrieval can be caused to power network prescribed level.
As shown in FIG. 8 and 9, the method for operation of this example is still all run for 6 fired power generating units, and blower fan is contributed to be maximum
50MW, every mineral hot furnace are minimum value 45MW.System unit capacity is larger under this state, but load is less, fired power generating unit
Relatively low operation level is in, the space that unit can issue additional output is larger, therefore after the excision of 135MW units, excision one
Platform mineral hot furnace can just make system be in stable running status.Remaining process is similar with a upper example, the sound of voltage and frequency
Should result respectively as shown in FIG. 8 and 9, busbar voltage is shaken in 0.95pu between 1.05pu after cutting machine, after taking stable measure,
Voltage stabilization fluctuates near 1.01pu；Cut after machine that system frequency is minimum to drop to 49.6Hz, be stabilized to after taking stable measure
49.93HZ is nearby fluctuated, it is seen that under this limiting condition, is cut off after maximum unit and is taken stable measure, can cause voltage
With frequency retrieval to power network prescribed level.
As shown in FIG. 10 and 11, this example unit operation mode is that 6 fired power generating units are all run, and blower fan is contributed as the most
Extreme 0MW, every mineral hot furnace are minimum value 45MW.Now the less and mineral hot furnace load of system output is relatively low, due to being
Spare capacity of uniting is smaller, therefore after excision 135MW units, need to cut off can just make system steady with unit generation amount identical load
It is fixed.After adjusting parameter makes system stable, 135MW units are cut off, two mineral hot furnace loads are cut off after 0.2s, system is kept steady
It is fixed.The response results of voltage and frequency respectively as shown in Figures 9 and 10, cut the voltage of system after machine 0.955pu and 1.09pu it
Between shake, after taking stable measure, system voltage is stable to be fluctuated near 1.03pu；And system frequency is down to 49.6Hz after cutting machine
Left and right, after taking stable measure, frequency stabilization is in 50Hz or so, it is seen that under this limiting condition, cuts off after maximum unit and adopts
Stable measure is taken, voltage and frequency retrieval can be caused to power network prescribed level.
As shown in Figures 12 and 13, this example unit operation mode is that 6 fired power generating units are all run, and blower fan is contributed as the most
Extreme 0MW, every mineral hot furnace are maximum 65MW.Unit capacity is smaller under this state, and load is very big, at unit
In the space very little that full hair-like state, unit additional issue are contributed, 135MW unit is now cut off, excision should be corresponded to slightly larger than 135MW's
Load can make system stable.Adjustment equipment parameter makes isolated network be in stable operation first, then cuts off 135MW units,
Three mineral hot furnace loads are cut off after 0.2s, the voltage and frequency of system are gone up, and system is stable.The response knot of voltage and frequency
Fruit is as shown in Figures 12 and 13.After cutting machine, system voltage shakes between 0.94pu and 1.07pu, after taking stable measure, system
Voltage recovers to 1pu or so；And system frequency drop to 49.35Hz or so after machine is cut, frequency retrieval after stable measure is taken
Nearby fluctuated to 50Hz, it is seen that under this limiting condition, cut off after maximum unit and take stable measure, can cause voltage and
Frequency retrieval is to power network prescribed level.
This patent uses RTDS realtime digital simulation platforms, has studied in detail islanded system under the various limit methods of operation
Frequency and voltage responsive and corresponding control strategy.It can be analyzed from result above, when unit capacity is larger, i.e., blower fan goes out
During power abundance, the output that each generating set can be issued additional is more, if now there is unit failure, non-fault generator group can increase
Power is sent out, can just make system stable so as to cut a small amount of mineral hot furnace load；And when unit capacity is smaller, i.e., blower fan is contributed
Deficiency, the output that each generator can be issued additional is also just less, if now there is large-sized unit failure, needs to cut off more ore deposit heat
Stove load can make system keep stable.
It is can be seen that from each limiting condition under high unit high load capacity capacity and low unit underload capacity, the source of system
Lotus configuration is relatively reasonable, and conversely under high unit underload capacity and low unit high load capacity capacity, the configuration of source lotus is unbalance, now
If there is the failure compared with large-sized unit, the stable more difficult control of measure, easily there is the phenomenon of voltage and collapse of frequency.
System can be stablized under four kinds of limiting conditions, and can make electricity using accurate stable means after unit is cut
Pressure and frequency retrieval are normal.It can be said that the bright islanded system designed herein blower fan contribute above and below 0~50MW fluctuation and
When every mineral hot furnace load fluctuates above and below 45~65MW, system can be stablized, and meet that event occurs in system maximum generation machine
During barrier, the characteristics of taking stable means still to keep system stable.
It should be appreciated that for those of ordinary skills, can according to the above description be improved or converted,
And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.
Claims (10)
- A kind of 1. security and stability appraisal procedure of island network, it is characterised in that：According to opening up for nickel-iron smelting factory island network Flutter structure and isolated network model is built in simulation software, determined according to the installed capacity of nickel-iron smelting factory island network and total load amount Unit output and load boundary value, four kinds of limiting conditions under two dimensions are determined according to unit output and load boundary value, Stable property simulation analysis are carried out to isolated network model under four kinds of limiting conditions, when can be transported under four kinds of limiting conditions with safety and stability OK, then illustrate that nickel-iron smelting factory island network can be with safe and stable operation under current installed capacity and total load amount.
- 2. the security and stability appraisal procedure of island network as claimed in claim 1, it is characterised in that four kinds of limiting conditions Respectively：Unit output high load capacity is horizontal high, and unit output high load capacity level is low, and unit output low load levels are low, and unit goes out These four limiting conditions of power low load levels height.
- 3. the security and stability appraisal procedure of island network as claimed in claim 1, it is characterised in that：The unit output border It is worth the boundary value contributed for blower fan, the boundary value that the blower fan is contributed is determined according to fan capacity.
- 4. the security and stability appraisal procedure of island network as claimed in claim 1, it is characterised in that：The load boundary value is The upper load limit value and load lower limit of all loads in whole island network region.
- 5. the security and stability appraisal procedure of island network as claimed in claim 1, it is characterised in that：The load boundary value is The upper load limit value and load lower limit of the load of maximum are fluctuated in whole island network region.
- 6. the security and stability appraisal procedure of island network as claimed in claim 5, it is characterised in that：Whole island network region The maximum load of middle fluctuation is mineral hot furnace, and the mineral hot furnace load boundary value includes mineral hot furnace maximum load Qmax* n and mineral hot furnace Minimum load Qmin*n。
- 7. the security and stability appraisal procedure of island network as claimed in claim 4, it is characterised in that：Every mineral hot furnace is most High load capacity QmaxDetermination method it is as follows：In the case where not considering that blower fan is contributed, according to the total load of statistics gained, and station service in total load and public affairs it is auxiliary The accounting of load obtains mineral hot furnace total load W, and the load Q=W/n, n of every mineral hot furnace are the quantity of mineral hot furnace；When blower fan reaches maximum installed capacity W1, mineral hot furnace highest total load W is obtainedmax, Wmax=W+W1, every mineral hot furnace is most High load capacity Qmax=Wmax/n。
- 8. the security and stability appraisal procedure of island network as claimed in claim 5, it is characterised in that every mineral hot furnace is most Underload QminDetermination method it is as follows：Mineral hot furnace total load W when asking for being out of order according to the power swing amplitude lower limit P of statistics gainedmin, Wmin=Wmax* P/n, Every mineral hot furnace minimum load Qmin=Wmin/n。
- 9. the security and stability appraisal procedure of island network as claimed in claim 1, it is characterised in that：The simulation software is RTDS。
- 10. the security and stability appraisal procedure of island network as claimed in claim 1, it is characterised in that described in four kinds of limit It is as follows that stable property simulation analysis process is carried out to isolated network model under operating mode：Wherein under a limiting condition, trip operation is carried out to the unit of EIAJ in nickel-iron smelting factory island network, so Necessary stable measure is implemented to nickel-iron smelting factory island network afterwards, if the frequency of nickel-iron smelting factory island network and voltage are in reality Prescribed level can be returned to after applying stable measure, then chooses another limiting condition and repeats this operation, until emulation terminates；Wherein, if occurring the frequency of nickel-iron smelting factory island network and voltage under a certain limiting condition after stable measure is implemented The phenomenon of prescribed level can not be still returned to, then emulation terminates, and illustrates nickel-iron smelting factory island network in current installed capacity Be likely to occur unstable phenomenon under total load amount；If under four kinds of limiting conditions, the frequency and voltage of nickel-iron smelting factory island network can be recovered after stable measure is implemented To prescribed level, then emulation terminates, and illustrates that nickel-iron smelting factory island network can be with current installed capacity and total load amount Safe and stable operation.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710731108.1A CN107591798B (en) | 2017-08-23 | 2017-08-23 | Safety stability evaluation method for isolated power grid |
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|---|---|---|---|
| CN201710731108.1A CN107591798B (en) | 2017-08-23 | 2017-08-23 | Safety stability evaluation method for isolated power grid |
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| CN107591798A true CN107591798A (en) | 2018-01-16 |
| CN107591798B CN107591798B (en) | 2020-08-07 |
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