CN109980654A - A kind of power grid high-frequency accident decline load prediction device and process - Google Patents
A kind of power grid high-frequency accident decline load prediction device and process Download PDFInfo
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- CN109980654A CN109980654A CN201910202835.8A CN201910202835A CN109980654A CN 109980654 A CN109980654 A CN 109980654A CN 201910202835 A CN201910202835 A CN 201910202835A CN 109980654 A CN109980654 A CN 109980654A
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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
- H02J3/12—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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- 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
- 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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
-
- 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
- H02J3/003—Load forecast, e.g. methods or systems for forecasting future load demand
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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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- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a kind of power grid high-frequency accidents to decline load prediction device, additionally provides a kind of power grid high-frequency accident decline load prediction process.Described device includes measuring unit, high frequency state recognition unit, predicting unit and load down processing unit, is connect with unit control system by soft communication modes, carries out the acquisition and passback of data.Load down prediction meanss account for the specific gravity of power grid total load by the changing rule and the unit actual load of mains frequency, predict the difference in current isolated network/micro-grid system between supply load and power load, load difference is passed into foundation of the unit control system as load down, caused unit frequency is ascended to heaven and overshoot when power grid local fault off-the-line of drawing up to greatest extent, and power grid large disturbances is avoided even to collapse.
Description
Technical field
The present invention relates to a kind of power grid high-frequency accident decline load prediction device and processes, belong to Load Prediction In Power Systems
Technical field.
Background technique
Mains frequency fluctuation can be caused if supply load and power load are uneven for the power grid of isolated operation, born
When lotus amount of unbalance is bigger, frequency fluctuation is bigger, and mains breakdown is caused when serious.Line fault (including it is single-phase earthing, alternate short
Road etc.) a kind of fault type common when being isolated power grid, when failure occurs, certain or a plurality of de- with electric line and main power grid
From power grid will get rid of a part of power load, it may appear that supply load is greater than the case where power load, if the load got rid of is more
Or account for entire network load specific gravity it is larger when, mains frequency can ascend to heaven rapidly, jeopardize unit and electric power netting safe running.
Currently, it is primary frequency modulation and OPC (Over-speed that fired power generating unit, which commonly inhibits the mode of Steam Turbine Over-speed Accident,
Protection Control, i.e. turbine over), the draw up method of high frequency of power grid cuts machine protection, but for automatic
The not high power grid of change degree, not yet configuration cut machine protection, and the targeted load down of Power Plant Side is to eliminate supply load in power grid
With the effective means of power load difference.The information of Power Plant Side monitoring wire is less at present, when line fault occurs, power plant
Side does not know about failure concrete condition, it is not known that electric network fault removal of load and the amount of unbalance that generates exist and blindly control by rule of thumb
The phenomenon that unit load, control it is improper easily causes mains frequency oscillation aggravation, cause when serious unit overspeed protection perseveration,
Situations such as mains breakdown.Therefore studying a kind of power grid high-frequency accident decline load prediction device and process has especially important meaning
Justice.
Summary of the invention
The object of the present invention is to provide a kind of designs rationally, the power grid high-frequency accident of reliable performance declines load prediction
Device additionally provides a kind of power grid high-frequency accident decline load prediction process, to solve the problems, such as background technique.
In order to solve the above technical problems, the present invention adopts the following technical scheme that:
A kind of power grid high-frequency accident decline load prediction device includes load down prediction meanss, DCS system (i.e. a kind of unit
Control system) and unit, wherein load down prediction meanss are connect with DCS system by soft communication modes；The DCS system signal
It is connected to unit.Load down prediction meanss are connect with DCS system by soft communication modes, and the acquisition and passback of data are carried out.Its
In, it is a kind of communication modes that communication, which is generally divided into soft communication and hardwire, and difference is, communication cable transmission is number
Amount or analog quantity, soft communication belong to the former, and transmission is digital quantity, and two core cables can communicate most ginsengs when soft communication
Number, when being transmitted for multivariable, more efficient and saving cable.The changing rule that load down prediction meanss pass through mains frequency
The specific gravity that power grid total load is accounted for the unit actual load predicts supply load and power load in current isolated network/micro-grid system
Between difference, by unit capacity and adjust surplus the power of the assembling unit issued to unit by DCS system and change signal and unit function
Rate setting, unit receives rear quick execution, and when power grid local fault off-the-line of drawing up to greatest extent, caused unit frequency was ascended to heaven
And overshoot, avoid power grid large disturbances from even collapsing.The load down prediction meanss include measuring unit, high frequency state identification list
Member, predicting unit and load down processing unit, electric signal is connected to high frequency state recognition unit and pre- to the measuring unit respectively
Unit is surveyed, the high frequency state recognition unit electric signal is connected to predicting unit, and it is negative that the predicting unit electric signal is connected to drop
Lotus processing unit.
Power grid high-frequency accident decline load prediction device above-mentioned further includes RTU, and the load down prediction meanss further include
Centralized processor, the equal electric signal of the measuring unit, high frequency state recognition unit, predicting unit, load down processing unit connect
It is connected to centralized processor, the measuring unit is also connected to DCS system by soft communication modes, and 9 signal of DCS system connects
It is connected to RTU10, the other end of RTU10 is connected to power grid.Wherein RTU (Remote Terminal Unit) i.e. telecommunication fills
It sets.Communication is generally divided into soft communication and hardwire, is a kind of communication modes, and difference is, communication cable transmission is number
Amount or analog quantity, soft communication belong to the former, and transmission is digital quantity, and two core cables can communicate most ginsengs when soft communication
Number, when being transmitted for multivariable, more efficient and saving cable.
Power grid high-frequency accident above-mentioned declines load prediction device, and the load down processing unit is also by soft communication modes
It is connected to DCS system.
Power grid high-frequency accident above-mentioned declines load prediction device, the also built-in power grid frequency dynamic processing of the predicting unit
Module.The mains frequency dynamic processing module is able to carry out dynamic and handles, specifically, 15 second datas of caching seek consecutive mean
Value obtains oscillation intermediate value, the foundation of reference frequency (50Hz) is deviateed as actual frequency.
A kind of power grid high-frequency accident decline load prediction process, using power grid high-frequency accident above-mentioned decline load prediction dress
It sets, comprising the following steps: load down prediction meanss are connect with DCS system by soft communication modes, are carried out the acquisition of data and are returned
It passes；Load down prediction meanss account for the specific gravity of power grid total load by the changing rule and the unit actual load of mains frequency, in advance
The difference in current electric grid system between supply load and power load is surveyed, passes through DCS system by unit capacity and adjusting surplus
The power of the assembling unit is issued to unit and changes signal and power of the assembling unit setting, and unit receives rear quick execution, electricity of drawing up to greatest extent
Caused unit frequency is ascended to heaven and overshoot when net local fault off-the-line, avoids power grid large disturbances or collapse.
Power grid high-frequency accident above-mentioned declines load prediction process, and above-mentioned steps specifically include:
RTU acquires unit load instruction, power grid total load signal, mains frequency signal, and measuring unit uses and DCS system
Soft communication modes acquire turbine speed signal, unit actual load, as high frequency state recognition unit and predicting unit according to
According to；
The mains frequency signal that high frequency state recognition unit acquires measuring unit is compared with frequency high limit setting value
Operation, the out-of-limit signal of output frequency；Postrun frequency is compared with each generating unit speed signal high limit setting value respectively again
Out-of-limit signal and logical operation；It is higher than the progress of 50%Pe signal and operation with each unit respectively again, exports result as high frequency
Status signal；
Predicting unit high frequency state signal after the off-the-line of electric network fault part triggers, according to the latch data of measuring unit,
Prediction calculates network load amount of unbalance, calculates the power regulation and set value of the power of unit, the power of the assembling unit is changed
Signal and power of the assembling unit setting are issued by DCS system to unit；
The power regulation for calculating the unit and set value of the power are sent to load down processing unit by predicting unit, drop
Load processing unit is changed according to the quantity of unit in netting by unit capacity and in the way of adjusting surplus according to weight assignment
The distribution of load safeguards the stabilization of mains frequency for dissolving the load of high frequency state occurrence time group surplus.
Power grid high-frequency accident above-mentioned declines load prediction process, and above-mentioned calculating process is by load down prediction meanss
The centralized processor set is completed.
Power grid high-frequency accident above-mentioned declines load prediction process, and power grid frequency dynamic built in the predicting unit handles mould
Block, continuous 15 seconds dynamic datas can be stored by defining an array, the maximum value and minimum value of band frequency when filtering out this, be made
For hunting of frequency section；Intermediate value of the average value of maximum value and minimum value as hunting of frequency, the difference with 50Hz, as frequency
Deviation；Unit power regulation ability of the predicting unit based on generating set in netting, the numerical value risen according to frequency and the unit are real
Border load accounts for the specific gravity of power grid total load, calculates net internal loading surplus value.
Compared with prior art, the invention has the beneficial effects that: the present invention using communication by the way of obtain unit and electricity
The data such as net frequency account for the specific gravity of power grid total load by the changing rule and the unit actual load of Tracking Frequency of Power Grids, in advance
The difference in current isolated network/micro-grid system between supply load and power load is surveyed, passes through DCS by unit capacity and adjusting surplus
System issues the power of the assembling unit to unit and changes signal and power of the assembling unit setting, and unit receives rear quick execution, intends to greatest extent
Caused unit frequency is ascended to heaven and overshoot when power grid local fault off-the-line processed, is avoided power grid large disturbances from even collapsing, is greatly improved
Isolated Network System operation stability.This invention ensures that load down prediction meanss is accurate effective, isolated network/micro-grid system is improved
Operational reliability reduces the risk of mains breakdown.
Detailed description of the invention
Fig. 1 is connection relationship diagram of the invention；
Fig. 2 is control structure figure of the invention；
Fig. 3 is control strategy figure of the invention.
The meaning of appended drawing reference: 1- measuring unit, 2- high frequency state recognition unit, 3- predicting unit, the processing of 4- load down
Unit, 5- centralized processor, 6- load down prediction meanss, 8- unit, 9-DCS system, 10-RTU.
The present invention is further illustrated with reference to the accompanying drawings and detailed description.
Specific embodiment
The embodiment of the present invention 1: as Figure 1-Figure 2, a kind of power grid high-frequency accident decline load prediction device includes drop
Load prediction device 6, DCS system 9 and unit 8, wherein load down prediction meanss 6 are connected with DCS system 9 by soft communication modes
It connects；9 signal of DCS system is connected to unit 8.Load down prediction meanss 6 are connect with DCS system 9 by soft communication modes, into
The acquisition and passback of row data.Load down prediction meanss 6 account for electricity by the changing rule and the unit actual load of mains frequency
The specific gravity of net total load predicts the difference in current isolated network/micro-grid system between supply load and power load, by unit capacity
Power of the assembling unit variation signal and power of the assembling unit setting are issued to unit 8 by DCS system 9 with surplus is adjusted, after unit 8 receives
Quick execution, when power grid local fault off-the-line of drawing up to greatest extent, caused unit frequency was ascended to heaven and overshoot, and power grid is avoided to disturb greatly
It is dynamic even to collapse.The load down prediction meanss 6 include that measuring unit 1, high frequency state recognition unit 2, predicting unit 3 and drop are negative
Lotus processing unit 4, electric signal is connected to high frequency state recognition unit 2 and predicting unit 3, the height to the measuring unit 1 respectively
2 electric signal of frequency state recognition unit is connected to predicting unit 3, and 3 electric signal of predicting unit is connected to load down processing unit
4.Specifically, wherein load down prediction meanss 6 can be with 9 integrated design of DCS system, product type and DCS system 9 are consistent,
It is (measuring unit 1 therein, high such as south Ai Mosheng Ovation/ Siemens T3000/ from maxDNA) using conventional DCS system
Frequency state recognition unit 2, predicting unit 3, load down processing unit 4 can use and 9 auxiliary products of DCS system；Load down is pre-
Surveying device 6 can realize that product type can use routine PLC (such as Siemens, Mo Dikang, AB with independent design using PLC
Deng), measuring unit 1 therein, high frequency state recognition unit 2, predicting unit 3, load down processing unit 4 can be matched using PLC
Cover product；Unit 8 is generating set, generally 50MW-1000MW fired power generating unit.
Further, power grid high-frequency accident decline load prediction device further includes RTU10, the load down prediction meanss 6
It further include centralized processor 5, the measuring unit 1, high frequency state recognition unit 2, predicting unit 3, load down processing unit 4
Equal electric signal is connected to centralized processor 5, and the measuring unit 1 is also connected to DCS system 9 by soft communication modes, described
9 signal of DCS system is connected to RTU10, and the other end of RTU10 is connected to power grid.Specifically, centralized processor 5 therein is adopted
Product type can be 300 series of PLC of Siemens；The product type that RTU10 is used can be the auspicious FJY-3 in south.The drop
Load processing unit 4 is connected to DCS system 9 also by soft communication modes.RTU10 acquires unit load instruction, power grid total load
Signal, mains frequency signal, measuring unit 1 is using real with the soft communication modes of DCS system 9 acquisition turbine speed signal, unit
Border load, as high frequency state recognition unit 2 and the foundation of predicting unit 3, wherein RTU (Remote Terminal Unit) is i.e.
Telecommunication devices.Wherein, communication is generally divided into soft communication and hardwire, is a kind of communication modes, difference is, connection
Cable transmission is digital quantity or analog quantity, and soft communication belongs to the former, and transmission is digital quantity, and two core cables when soft communication
Most parameters can be communicated, when being transmitted for multivariable, more efficient and saving cable.High frequency state recognition unit 2 will measure
The mains frequency signal that unit 1 acquires is compared operation, the out-of-limit signal of output frequency with frequency high limit setting value；Distinguish again
Postrun frequency out-of-limit signal and logical operation are compared with each generating unit speed signal high limit setting value；Again respectively and respectively
Platform unit is higher than the progress of 50%Pe signal and operation, exports result as high frequency state signal.Predicting unit 3 is in electric network fault office
High frequency state signal triggers after portion's off-the-line, and according to the latch data of measuring unit 1, prediction calculates network load amount of unbalance,
The power of the assembling unit is changed signal and power of the assembling unit setting passes through DCS system by the power regulation and set value of the power for calculating unit 8
System 9 is issued to unit 8.Centralized processor 5 of the above-mentioned calculating process as built in load down prediction meanss 6 is completed.For
The power regulation for calculating the unit and set value of the power are sent at load down by load down processing unit 4, predicting unit 3
Unit 4 is managed, load down processing unit 4 by unit capacity and adjusts surplus according to weight assignment according to the quantity of unit in netting
Mode carries out the distribution of variable load amount, for dissolving the load of high frequency state occurrence time group surplus, safeguards mains frequency
Stablize.
Specifically, the also built-in power grid frequency dynamic processing module of the predicting unit 3.In order to avoid frequency when load oscillation
Prediction deviation caused by unstable is larger, and the predicting unit 3 is provided with mains frequency dynamic processing module, defines a number
Group can store continuous 15 seconds dynamic datas, the maximum value and minimum value of band frequency when filtering out this, as hunting of frequency area
Between；Intermediate value of the average value of maximum value and minimum value as hunting of frequency, the difference with 50Hz, as frequency departure.Actually answer
With in the process, product type used by mains frequency dynamic processing module can be 300 series of Siemens, 500300 system of AB
Arrange PLC etc..
The unit power regulation of generator is indicated as the power for raising and reducing generating set sending of frequency is reduced
Or increased number, the unit power regulation of generator and the frequency characteristic of generating set are related.I.e. the unit of generator is adjusted
Power, unit MW/Hz, such as formula 1.
Wherein: KGRepresent the unit power regulation of generator, Δ PGPower variation is represented, Δ f represents frequency variation.
In addition, the unit power regulation of generator is according to adjusting, general Steam Turbine is 20-33.3MW/Hz.Prediction
Unit 3 be also based on net in generating set unit power regulation ability, according to frequency rise number, calculate net internal loading
How much is surplus.
Embodiment 2: as shown in Figure 1-Figure 3, a kind of power grid high-frequency accident decline load prediction process, using power grid above-mentioned
High frequency accident declines load prediction device, comprising the following steps: load down prediction meanss 6 and DCS system 9 pass through soft communication modes
Connection, carries out the acquisition and passback of data；Load down prediction meanss 6 pass through the changing rule and the unit actual negative of mains frequency
Lotus accounts for the specific gravity of power grid total load, predicts the difference in current electric grid system between supply load and power load, holds by unit
Amount and adjusting surplus issue the power of the assembling unit to unit 8 by DCS system 9 and change signal and power of the assembling unit setting, and unit 8 receives
Quick execution afterwards, when power grid local fault off-the-line of drawing up to greatest extent, caused unit frequency was ascended to heaven and overshoot, avoided power grid big
Disturbance or collapse.Wherein, communication is generally divided into soft communication and hardwire, is a kind of communication modes, difference is, connection
Cable transmission is digital quantity or analog quantity, and soft communication belongs to the former, and transmission is digital quantity, and two core cables when soft communication
Most parameters can be communicated, when being transmitted for multivariable, more efficient and saving cable.
Further, above-mentioned steps specifically include:
RTU10 acquires unit load instruction, power grid total load signal, mains frequency signal, and measuring unit 1 uses and DCS
The soft communication modes of system 9 acquire turbine speed signal, unit actual load, single as high frequency state recognition unit 2 and prediction
The foundation of member 3；
The mains frequency signal that high frequency state recognition unit 2 acquires measuring unit 1 is compared with frequency high limit setting value
Compared with operation, the out-of-limit signal of output frequency；Postrun frequency is compared with each generating unit speed signal high limit setting value respectively again
The out-of-limit signal of rate and logical operation；It is higher than the progress of 50%Pe signal and operation with each unit respectively again, output result is as high
Frequency status signal；
The high frequency state signal after the off-the-line of electric network fault part of predicting unit 3 triggers, according to the latch number of measuring unit 1
According to prediction calculates network load amount of unbalance, the power regulation and set value of the power of unit 8 is calculated, by the power of the assembling unit
Signal and power of the assembling unit setting is changed to issue by DCS system 9 to unit 8；
The power regulation for calculating the unit 8 and set value of the power are sent to load down processing unit by predicting unit 3
4, load down processing unit 4 according to net in unit quantity, by unit capacity and adjust surplus according to weight assignment in the way of into
The distribution of row variable load amount safeguards the stabilization of mains frequency for dissolving the load of high frequency state occurrence time group surplus.
Specifically, centralized processor 5 of the above-mentioned calculating process as built in load down prediction meanss 6 is completed.
Further, power grid frequency dynamic processing module built in the predicting unit 3, defining an array being capable of the company of storage
Continuous 15 seconds dynamic datas, the maximum value and minimum value of band frequency when filtering out this, as hunting of frequency section；Maximum value and most
Intermediate value of the average value of small value as hunting of frequency, the difference with 50Hz, as frequency departure；Predicting unit 3 is based on hair in net
The unit power regulation ability of motor group, the numerical value and the unit actual load that are risen according to frequency account for the ratio of power grid total load
Weight, calculates net internal loading surplus value.In actual application, product type used by mains frequency dynamic processing module can
Think 300 series of Siemens, 500300 series of PLC of AB etc..
Embodiment 3: the network structure of power grid high-frequency accident decline load prediction device is as shown in Fig. 2, produce including surveying
The load down prediction meanss 6 of unit 1, high frequency state recognition unit 2, predicting unit 3 and load down processing unit 4 are measured, and are dropped negative
Centralized processor 5 built in lotus prediction meanss 6 is communicated with 9 side communication unit of DCS system and RTU10, receives 8 turns of unit
Fast signal, real-time load signal, power grid total load signal etc. send unit power setting and power of the assembling unit variation.Pass through electricity
The changing rule and the unit actual load of net frequency account for the specific gravity of power grid total load, predict to supply in current isolated network/micro-grid system
Difference between electric load and power load issues unit function to unit 8 by DCS system 9 by unit capacity and adjusting surplus
Rate changes signal and power of the assembling unit setting, and unit 8 receives rear quick execution, when power grid local fault off-the-line of drawing up to greatest extent
Caused unit frequency is ascended to heaven and overshoot, and power grid large disturbances is avoided even to collapse.According to the control logic structure of Fig. 3, first root
High frequency state signal, then frequency difference calculated and generator are identified according to mains frequency and turbine speed redundancy determination
Unit power regulation be multiplied, calculate the unit load down amount.
Embodiment 4: as Figure 1-Figure 2, a kind of power grid high-frequency accident decline load prediction device includes load down prediction
Device 6, DCS system 9 and unit 8, wherein load down prediction meanss 6 are connect with DCS system 9 by soft communication modes；The DCS
9 signal of system is connected to unit 8.Load down prediction meanss 6 are connect with DCS system 9 by soft communication modes, and adopting for data is carried out
Collection and passback.Load down prediction meanss 6 account for power grid total load by the changing rule and the unit actual load of mains frequency
Specific gravity predicts the difference in current isolated network/micro-grid system between supply load and power load, by unit capacity and adjusts surplus
The power of the assembling unit, which is issued, to unit 8 by DCS system 9 changes signal and power of the assembling unit setting, unit 8 receives rear quick execution,
Caused unit frequency is ascended to heaven and overshoot when power grid local fault off-the-line of drawing up to greatest extent, and power grid large disturbances is avoided even to collapse
It bursts.The load down prediction meanss 6 include that measuring unit 1, high frequency state recognition unit 2, predicting unit 3 and load down processing are single
Member 4, electric signal is connected to high frequency state recognition unit 2 and predicting unit 3 to the measuring unit 1 respectively, and the high frequency state is known
Other 2 electric signal of unit is connected to predicting unit 3, and 3 electric signal of predicting unit is connected to load down processing unit 4.Specifically,
The product type that measuring unit 1 therein uses can be the auspicious FJY-3 in south, Ovation analog acquisition fastener；High frequency state is known
The product type that other unit 2 uses can be Ovation analog acquisition fastener；The product type that predicting unit 3 uses can be with
For 300 series of PLC of Siemens；The product type that load down processing unit 4 uses can be 300 series of PLC of Siemens；Load down
The product type that prediction meanss 6 use can be with are as follows: 300 series of PLC of Siemens；The product type that DCS system 9 uses can be with are as follows:
Ovation or maxDNA；Unit 8 is generating set, generally 50MW-1000MW fired power generating unit.
Further, power grid high-frequency accident decline load prediction device further includes RTU10, the load down prediction meanss 6
It further include centralized processor 5, the measuring unit 1, high frequency state recognition unit 2, predicting unit 3, load down processing unit 4
Equal electric signal is connected to centralized processor 5, and the measuring unit 1 is also connected to DCS system 9 by soft communication modes, described
9 signal of DCS system is connected to RTU10, and the other end of RTU10 is connected to power grid.Specifically, centralized processor 5 therein is adopted
Product type can be 300 series of PLC of Siemens；The product type that RTU10 is used can be the auspicious FJY-3 in south.The drop
Load processing unit 4 is connected to DCS system 9 also by soft communication modes.RTU10 acquires unit load instruction, power grid total load
Signal, mains frequency signal, measuring unit 1 is using real with the soft communication modes of DCS system 9 acquisition turbine speed signal, unit
Border load, as high frequency state recognition unit 2 and the foundation of predicting unit 3, wherein RTU (Remote Terminal Unit) is i.e.
Telecommunication devices.Wherein, communication is generally divided into soft communication and hardwire, is a kind of communication modes, difference is, connection
Cable transmission is digital quantity or analog quantity, and soft communication belongs to the former, and transmission is digital quantity, and two core cables when soft communication
Most parameters can be communicated, when being transmitted for multivariable, more efficient and saving cable.High frequency state recognition unit 2 will measure
The mains frequency signal that unit 1 acquires is compared operation, the out-of-limit signal of output frequency with frequency high limit setting value；Distinguish again
Postrun frequency out-of-limit signal and logical operation are compared with each generating unit speed signal high limit setting value；Again respectively and respectively
Platform unit is higher than the progress of 50%Pe signal and operation, exports result as high frequency state signal.Predicting unit 3 is in electric network fault office
High frequency state signal triggers after portion's off-the-line, and according to the latch data of measuring unit 1, prediction calculates network load amount of unbalance,
The power of the assembling unit is changed signal and power of the assembling unit setting passes through DCS system by the power regulation and set value of the power for calculating unit 8
System 9 is issued to unit 8.Centralized processor 5 of the above-mentioned calculating process as built in load down prediction meanss 6 is completed.For
The power regulation for calculating the unit and set value of the power are sent at load down by load down processing unit 4, predicting unit 3
Unit 4 is managed, load down processing unit 4 by unit capacity and adjusts surplus according to weight assignment according to the quantity of unit in netting
Mode carries out the distribution of variable load amount, for dissolving the load of high frequency state occurrence time group surplus, safeguards mains frequency
Stablize.
Specifically, the also built-in power grid frequency dynamic processing module of the predicting unit 3.In order to avoid frequency when load oscillation
Prediction deviation caused by unstable is larger, and the predicting unit 3 is provided with mains frequency dynamic processing module, defines a number
Group can store continuous 15 seconds dynamic datas, the maximum value and minimum value of band frequency when filtering out this, as hunting of frequency area
Between；Intermediate value of the average value of maximum value and minimum value as hunting of frequency, the difference with 50Hz, as frequency departure.Actually answer
With in the process, product type used by mains frequency dynamic processing module can be 300 series of Siemens, 500300 system of AB
Arrange PLC etc..
The unit power regulation of generator is indicated as the power for raising and reducing generating set sending of frequency is reduced
Or increased number, the unit power regulation of generator and the frequency characteristic of generating set are related.I.e. the unit of generator is adjusted
Power, unit MW/Hz, such as formula 1.
Wherein: KGRepresent the unit power regulation of generator, Δ PGPower variation is represented, Δ f represents frequency variation.
In addition, the unit power regulation of generator is according to adjusting, general Steam Turbine is 20-33.3MW/Hz.Prediction
Unit 3 be also based on net in generating set unit power regulation ability, according to frequency rise number, calculate net internal loading
How much is surplus.
Claims (8)
1. a kind of power grid high-frequency accident declines load prediction device, which is characterized in that including load down prediction meanss (6), unit
(8) and DCS system (9), wherein load down prediction meanss (6) are connect with DCS system (9) by soft communication modes；The DCS system
System (9) signal is connected to unit (8)；
The load down prediction meanss (6) include measuring unit (1), high frequency state recognition unit (2), predicting unit (3) and drop
Load processing unit (4), electric signal is connected to high frequency state recognition unit (2) and predicting unit to the measuring unit (1) respectively
(3), high frequency state recognition unit (2) electric signal is connected to predicting unit (3), predicting unit (3) the electric signal connection
In load down processing unit (4).
2. power grid high-frequency accident according to claim 1 declines load prediction device, which is characterized in that further include RTU
(10), the load down prediction meanss (6) further include centralized processor (5), the measuring unit (1), high frequency state identification
Unit (2), predicting unit (3), load down processing unit (4) electric signal are connected to centralized processor (5), and the measurement is single
First (1) is also connected to DCS system (9) by soft communication modes, and DCS system (9) signal is connected to RTU (10), RTU (10)
The other end be connected to power grid.
3. power grid high-frequency accident according to claim 2 declines load prediction device, which is characterized in that at the load down
It manages unit (4) and is connected to DCS system (9) also by soft communication modes.
4. power grid high-frequency accident according to claim 3 declines load prediction device, which is characterized in that the predicting unit
(3) also built-in power grid frequency dynamic processing module.
5. a kind of power grid high-frequency accident declines load prediction process, using any power grid high-frequency accident of claim 1-4
Decline load prediction device, which comprises the following steps:
Load down prediction meanss (6) are connect with DCS system (9) by soft communication modes, and the acquisition and passback of data are carried out；Drop is negative
Lotus prediction meanss (6) account for the specific gravity of power grid total load by the changing rule and the unit actual load of mains frequency, and prediction is worked as
Difference in preceding network system between supply load and power load, by unit capacity and adjust surplus by DCS system (9) to
Unit (8) issues the power of the assembling unit and changes signal and power of the assembling unit setting, and unit (8) receives rear quick execution, intends to greatest extent
Caused unit frequency is ascended to heaven and overshoot when power grid local fault off-the-line processed, avoids power grid large disturbances or collapse.
6. power grid high-frequency accident according to claim 5 declines load prediction process, which is characterized in that above-mentioned steps are specific
Include:
RTU (10) acquires unit load instruction, power grid total load signal, mains frequency signal, and measuring unit (1) uses and DCS
The soft communication modes of system (9) acquire turbine speed signal, unit actual load, as high frequency state recognition unit (2) and in advance
Survey the foundation of unit (3)；
The mains frequency signal that high frequency state recognition unit (2) acquires measuring unit (1) is compared with frequency high limit setting value
Compared with operation, the out-of-limit signal of output frequency；Postrun frequency is compared with each generating unit speed signal high limit setting value respectively again
The out-of-limit signal of rate and logical operation；It is higher than the progress of 50%Pe signal and operation with each unit (8) respectively again, exports result conduct
High frequency state signal；
Predicting unit (3) high frequency state signal after the off-the-line of electric network fault part triggers, according to the latch number of measuring unit (1)
According to prediction calculates network load amount of unbalance, the power regulation and set value of the power of unit (8) is calculated, by unit function
Rate changes signal and power of the assembling unit setting and is issued by DCS system (9) to unit (8)；
The power regulation for calculating the unit (8) and set value of the power are sent to load down processing unit by predicting unit (3)
(4), load down processing unit (4) by unit capacity and adjusts surplus according to weight assignment according to the quantity of unit (8) in netting
Mode carries out the distribution of variable load amount, for dissolving the load of high frequency state occurrence time group (8) surplus, safeguards mains frequency
Stabilization.
7. power grid high-frequency accident according to claim 6 declines load prediction process, which is characterized in that above-mentioned calculating
Centralized processor (5) of the journey as built in load down prediction meanss (6) is completed.
8. power grid high-frequency accident according to claim 6 declines load prediction process, which is characterized in that the predicting unit
(3) power grid frequency dynamic processing module built in, continuous 15 seconds dynamic datas can be stored by defining an array, when filtering out this
The maximum value and minimum value of band frequency, as hunting of frequency section；The average value of maximum value and minimum value is as hunting of frequency
Intermediate value, the difference with 50Hz, as frequency departure；Unit power regulation ability of the predicting unit (3) based on generating set in netting,
The numerical value and the unit actual load that are risen according to frequency account for the specific gravity of power grid total load, calculate net internal loading surplus value.
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| CN111835022A (en) * | 2020-07-14 | 2020-10-27 | 国网电力科学研究院有限公司 | Industrial isolated network frequency adjusting method, device and system |
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