CN107769273A - A kind of steam turbine load distribution control method and system - Google Patents
A kind of steam turbine load distribution control method and system Download PDFInfo
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- CN107769273A CN107769273A CN201711070376.XA CN201711070376A CN107769273A CN 107769273 A CN107769273 A CN 107769273A CN 201711070376 A CN201711070376 A CN 201711070376A CN 107769273 A CN107769273 A CN 107769273A
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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
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- Control Of Eletrric Generators (AREA)
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Abstract
The present invention relates to a kind of steam turbine load distribution control method and system, especially for the power station (power station for including Isolated Networks) of the relatively independent operation of more Turbo-generator Set compositions, comprises the following steps：Calculate output performance control instruction Δ Sout；Calculate the load degree of approach d of every uniti, calculated load degree of approach average value davg；Unit load distribution correction factor A is calculatedi；According to output performance control instruction Δ Sout, unit load distribution correction factor Ai, fm control signal fiAnd DEH main valve bit instructions Ui, steam turbine valve control instruction U is calculatedoutiUnit increasing and decreasing load is controlled, balances generation load and power load.The beneficial effects of the invention are as follows：According to each unit generation capabilities might in power network and the output load of net frequency fluctuation signal adjustment each unit unit, each unit unit in each power station is set synchronously to undertake load variations or frequency change, to maintain generation load and station service balancing the load, and isolated network frequency stabilization.
Description
Technical field
The present invention relates to a kind of steam turbine load distribution control method and system, especially for more Turbo-generator Set groups
Into relatively independent operation power station (power station for including Isolated Networks).
Background technology
The private station in the power station of relatively independent operation, especially large size industrial enterprise, generally there are more Turbo-generator Sets
Composition, the electric energy of these units production are mainly delivered to itself business equipment productive power, some enterprise requirements private station energy
Maintain station-service electric equilibrium, i.e., neither to external power grid (such as national grid) power transmission, also not from external power grid (such as national grid) power taking, because
Enterprise also wants the higher industrial electricity charge of expenditure cost if from outer net power taking, if to outer net power transmission, not only can not receive the electricity charge,
Also to be limited by administration of power networks department and management and control.
Because general production unit station service load fluctuation is larger, so the moment each turbine generator in power station must be adjusted
The generated energy of unit, all as a result sent out using each Turbo-generator Set generation load in artificial judgment and artificial setting power station at present
Electric load and the power load often deviation that balances each other are larger.
For the power station of Isolated Networks, if generation load can not balance with power load, mains frequency will fluctuate,
Load unbalanced deviation is bigger, and frequency fluctuation is bigger, or even makes mains breakdown.Steam turbine DEH control system is typically set at present
Primary frequency function, i.e., according to mains frequency and the frequency departure and unit diversity factor parameter adjustment machine of setting value (3000rpm)
Group generation load output, is balanced with power load, mains frequency is remained stable.Due to each steamer in isolated operation power network
The fm capacity of generating set is different, it sometimes appear that " robbing load " phenomenon occurs, i.e. some units overload operation
Or run at low load, and some units are also in normal operation range, so reduce power station unit fm capacity and
Generating efficiency.
Therefore a kind of steam turbine load distribution control method is invented, according to each unit generation capabilities might in net and net frequency
Fluctuation signal adjusts the output load of each unit unit, each unit unit in each power station is synchronously undertaken load variations or frequency change
Change, to maintain generation load and station service balancing the load, and isolated network frequency stabilization.
The content of the invention
The shortcomings that for such scheme, the invention provides in a kind of relatively independent power plant under operation Turbo-generator Set it is negative
Lotus distributes control method and system.
The technical scheme is that：A kind of steam turbine load distributes control method, and methods described applies to more steamer hairs
The isolated power grid pattern or simultaneously the power station of outer net operational mode, this method comprise the following steps that group of motors forms：
(1) according to the frequency departure signal delta F in whole power station and power deviation signal delta P, calculate output performance control and refer to
Make Δ Sout；
(2) the load degree of approach d of every unit is calculatedi, according to load degree of approach diCalculated load degree of approach average value davg；
According to load degree of approach di, load degree of approach average value davg, actual power signal PiWith peak power signal PmaxList is calculated
First sharing of load correction factor Ai；
(3) according to output performance control instruction Δ Sout, unit load distribution correction factor Ai, fm control signal fiAnd
DEH main valve bit instructions Ui, steam turbine valve control instruction U is calculatedoutiUnit increasing and decreasing load is controlled, makes generation load and use
Electric load balances.
Preferably, under isolated power grid pattern, output performance control instruction Δ S is calculated according to frequency departure signal delta Fout；
Under simultaneously outer net operational mode, output performance control instruction Δ S is calculated according to power deviation signal delta Pout。
Preferably, the calculated load degree of approach diMethod be：Receive unit actual power signal PiBelieve with peak power
Number Pmax, load degree of approach d is calculatedi：
di=(1-Pi/Pmax)。
Preferably, unit load distribution correction factor AiCalculation formula be：
Preferably, the steam turbine valve control instruction UoutiCalculation formula be：
Uouti=∑ (βi·Ai·ΔSout+Gi+ki·Ai·fi)
Wherein, β, k are constants, and G is DEH main valve bit instructions.
Present invention also offers a kind of steam turbine load to distribute control system, including：If main Control System of Load Distribution device and
Dry unit load dispensing controller, the main Control System of Load Distribution device include main Properties Control module and main load balancer module,
The unit load dispensing controller includes unit load balance module and unit frequency modulation control module；The main Properties Control mould
Block monitoring frequency deviation signal Δ F and power deviation signal delta P, calculate output performance control instruction Δ SoutList to each unit
First Control System of Load Distribution device；The unit load balance module and main load balancer module calculated load degree of approach diIt is averagely negative
Lotus degree of approach davg, obtain unit load distribution correction factor Ai；Unit frequency modulation control module calculates fm control signal fi；It is described
Steam turbine valve control instruction U is calculated in unit load dispensing controlleroutiTurbo-generator Set increasing and decreasing load is controlled, makes hair
Electric load and power load balance.
The beneficial effects of the invention are as follows：Each list is adjusted according to each unit generation capabilities might in power network and net frequency fluctuation signal
The output load of first unit, each unit unit in each power station is set synchronously to undertake load variations or frequency change, it is negative to maintain to generate electricity
Lotus and station service balancing the load, and isolated network frequency stabilization.
Brief description of the drawings
The present invention is further detailed explanation with reference to the accompanying drawings and detailed description.
Fig. 1 is the Control of Power Plant structured flowchart of more Turbo-generator Set compositions of the embodiment of the present invention；
Fig. 2 is power station steam turbine Control System of Load Distribution computation model block diagram of the embodiment of the present invention；
Fig. 3 is the overall flow schematic diagram of the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, technical scheme is further described, but the present invention is not limited to these realities
Apply example.
Accompanying drawing 1 shows the Control of Power Plant structured flowchart of more Turbo-generator Set compositions, with wherein two turbine generators
Exemplified by unit, steam turbine 101 and 201, drive generator 102 and 202 to generate electricity respectively, by field regulator 105 and 205, encourage
After magnetic transformer 107 and 207, divide two-way, become 106 and 206 through too high factory all the way, powered to power plant auxiliary machine, another way is through main transformer
Depressor 108 and 208, and main oil circuit breaker 110 and 210, are connected to utility power grid 905, rise and standby become 109 and 209 as starting and standby
Transformer.For the enterprise power station of non-orphaned operation, external power grid 906 (being typically national grid) can be also connected to, will be looked forward to
Industry providing auxiliary power amount is sent to external power grid, or takes electricity from external power grid.The enterprise power station of isolated operation, then itself composition is one small
Operation of power networks, realize the balance that enterprise generates electricity with power load.
Load distribution control system shown in accompanying drawing 2, distributed and controlled by the unit load of main Control System of Load Distribution device and each unit
Device composition processed.
Main Control System of Load Distribution device：It is made up of main Properties Control module 902 and main load balancer module 903, main performance control
The monitoring frequency deviation signal Δ F of molding block 902 and power deviation signal delta P, calculating output valve are Δ Sout, give each unit
Unit load dispensing controller computing.
When power station generated energy is more than business electrical amount, electricity Δ P is conveyed to external power grid, i.e. power offset value Δ P is small
In 0, main Properties Control module 902 calculates output Δ SoutValue is less than 0, it is desirable to which each unit unit reduces load, conversely, working as power station
When generated energy is less than business electrical amount, then require that each unit unit increases load, when to maintain enterprise's plant load equilibrium of supply and demand.
In isolated generating plant, when mains frequency is more than setpoint frequency (3000rpm) value, i.e. frequency deviation F is small
In 0, main Properties Control module 902 calculates output Δ SoutValue is less than 0, it is desirable to which each unit unit, which is reduced, contributes, conversely, working as power network
When frequency is less than setpoint frequency (3000rpm) value, then require that the increase of each unit unit is contributed, to maintain enterprise's plant load supply and demand
Balance, it is ensured that isolated power grid frequency stabilization.
Main load balancer module 903 receives the load proximity signal of each unit unit load balance control module output
di, calculate average load degree of approach davg, the foundation as each unit unit load EQUILIBRIUM CALCULATION FOR PROCESS.
Unit load dispensing controller：Mainly by the unit load balance module and unit frequency modulation control module group of each unit
Into.Unit frequency modulation control module 112 calculates fm control signal fi, monoblock is participated in isolated power grid frequency modulation control, it is ensured that
Isolated network frequency stabilization.Unit load balance module 111 receives unit actual power signal PiWith peak power signal Pmax, calculate
Obtain load degree of approach di。
The main calculated load degree of approach average value d of Control System of Load Distribution device 901avg, unit load balance module 111 calculates list
First sharing of load correction factor Ai.Sharing of load correction factor AiProperties Control for correcting each unit instructs Δ SoutAnd frequency modulation
Control signal fi。
As Properties Control instruction Δ SoutWith fm control signal f1It is required that monoblock application of load, i.e. Δ Sout>0 or fi>0
When, if Generating Unit Load degree of approach diMore than average load degree of approach davgWhen, show that the monoblock increases the space of load
More relatively large, unit load distribution correction factor output is more than 1, to increase the relative load of monoblock output.Conversely, work as
Generating Unit Load degree of approach diLess than average load degree of approach davgWhen, show that the space of monoblock increasing load is relatively small
A bit, unit load distribution correction factor output is less than 1, to reduce the relative load of monoblock output.
As Properties Control instruction Δ SoutWith fm control signal f1It is required that monoblock load shedding, i.e. Δ Sout<0 or fi<0
When, if Generating Unit Load degree of approach diLess than average load degree of approach davgWhen, show the space of the monoblock load shedding
More relatively large, unit load distribution correction factor output is more than 1, to strengthen the relative rate of unloading of the monoblock.Conversely,
As Generating Unit Load degree of approach diMore than average load degree of approach davgWhen, show that the space of the monoblock load shedding is relative
Smaller, unit load distribution correction factor output is less than 1, to reduce the relative rate of unloading of the monoblock.
Unit load dispensing controller finally calculates steam turbine valve control instruction UoutiOutput control turbine governor valve
103 realize that steam turbine load (frequency) controls, and each unit unit distributes the adjustment of correction factor by unit load, makes each unit
Load degree of approach convergence is identical, reaches the purpose of each unit synchronization distribution load in power station, and the frequency modulation energy of enhancing power station unit
Power.
The present embodiment further relates to a kind of steam turbine load distribution control method, and methods described applies to more steam turbine generators
The isolated power grid pattern of group composition or the simultaneously power station of outer net operational mode.With reference to accompanying drawing 3, this method comprises the following steps：
(1) according to the frequency departure signal delta F in whole power station and power deviation signal delta P, calculate output performance control and refer to
Make Δ Sout。
Under isolated power grid pattern, output performance control instruction Δ Sout is calculated according to frequency departure signal delta F；Simultaneously outer
Under network operation pattern, output performance control instruction Δ Sout is calculated according to power deviation signal delta P.
(2) the load degree of approach d of every unit is calculatedi, according to load degree of approach diCalculated load degree of approach average value davg；
According to load degree of approach di, load degree of approach average value davg, actual power signal PiWith peak power signal PmaxList is calculated
First sharing of load correction factor Ai；
Receive unit actual power signal PiWith peak power signal Pmax, load degree of approach d is calculatedi：
di=(1-Pi/Pmax)。
Unit load distribution correction factor AiCalculation formula be：
(3) according to output performance control instruction Δ Sout, unit load distribution correction factor Ai, fm control signal fiAnd
DEH main valve bit instructions Ui, steam turbine valve control instruction U is calculatedoutiUnit increasing and decreasing load is controlled, makes generation load and use
Electric load balances.
Steam turbine valve control instruction UoutiCalculation formula be：
Uouti=∑ (βi·Ai·ΔSout+Gi+ki·Ai·fi), wherein, β, k are constants, and G is DEH main valve bit instructions.
Specific embodiment described herein is only to spirit explanation for example of the invention.Technology belonging to the present invention is led
The technical staff in domain can be made various modifications or supplement to described specific embodiment or be replaced using similar mode
Generation, but without departing from the spiritual of the present invention or surmount scope defined in appended claims.
Claims (6)
1. a kind of steam turbine load distributes control method, methods described applies to the isolated power grid of more Turbo-generator Set compositions
Pattern or the simultaneously power station of outer net operational mode, it is characterised in that this method comprises the following steps：
(1) according to the frequency departure signal delta F in whole power station and power deviation signal delta P, output performance control instruction Δ is calculated
Sout；
(2) the load degree of approach d of every unit is calculatedi, according to load degree of approach diCalculated load degree of approach average value davg；According to
Load degree of approach di, load degree of approach average value davg, actual power signal PiWith peak power signal PmaxUnit is calculated to bear
Lotus distribution correction factor Ai；
(3) according to output performance control instruction Δ Sout, unit load distribution correction factor Ai, fm control signal fiAnd DEH
Main valve bit instruction Ui, steam turbine valve control instruction U is calculatedoutiUnit increasing and decreasing load is controlled, bears generation load and electricity consumption
Lotus balances.
2. steam turbine load according to claim 1 distributes control method, it is characterised in that under isolated power grid pattern,
Output performance control instruction Δ S is calculated according to frequency departure signal delta Fout；Under simultaneously outer net operational mode, according to power deviation
Signal delta P calculates output performance control instruction Δ Sout。
3. steam turbine load according to claim 2 distributes control method, it is characterised in that the calculated load degree of approach
diMethod be：Receive unit actual power signal PiWith peak power signal Pmax, load degree of approach d is calculatedi：
di=(1-Pi/Pmax)。
4. steam turbine load according to claim 3 distributes control method, it is characterised in that unit load distribution amendment system
Number AiCalculation formula be：
5. steam turbine load according to claim 4 distributes control method, it is characterised in that the steam turbine valve control
Instruct UoutiCalculation formula be：
Uouti=∑ (βi·Ai·ΔSout+Gi+ki·Ai·fi)
Wherein, β, k are constants, and G is DEH main valve bit instructions.
6. a kind of steam turbine load distributes control system, it is characterised in that including：Main Control System of Load Distribution device and some units
Control System of Load Distribution device, the main Control System of Load Distribution device include main Properties Control module and main load balancer module, the list
First Control System of Load Distribution device includes unit load balance module and unit frequency modulation control module；The main Properties Control module monitors
Frequency departure signal delta F and power deviation signal delta P, calculate output performance control instruction Δ SoutUnit load to each unit
Dispensing controller；The unit load balance module and main load balancer module calculated load degree of approach diApproached with average load
Spend davg, obtain unit load distribution correction factor Ai；Unit frequency modulation control module calculates fm control signal fi；The unit is born
Steam turbine valve control instruction U is calculated in lotus dispensing controlleroutiTurbo-generator Set increasing and decreasing load is controlled, makes generation load
Balanced with power load.
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| CN108649618A (en) * | 2018-04-04 | 2018-10-12 | 广西大学 | A kind of exciter control system of the Turbo-generator Set suitable for power plant for self-supply |
| CN108708872A (en) * | 2018-04-26 | 2018-10-26 | 西安交通大学 | A kind of paired running turbocompressor control method and control system |
| CN109146269A (en) * | 2018-08-07 | 2019-01-04 | 中国华电科工集团有限公司 | The accurate distribution method of unit load when a kind of Isolated Network System line fault |
| CN109782584A (en) * | 2019-01-21 | 2019-05-21 | 杭州澎康自动化科技有限公司 | A kind of pumping back type steam turbine self-adjusting control |
| CN112803438A (en) * | 2021-02-25 | 2021-05-14 | 中国五环工程有限公司 | Frequency control system and method for multiple generators in isolated network operation power plant |
| CN114922701A (en) * | 2022-05-25 | 2022-08-19 | 哈尔滨汽轮机厂有限责任公司 | Three-furnace two-machine main pipe system biomass power plant steam turbine pressure and power control system |
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| CN108708872A (en) * | 2018-04-26 | 2018-10-26 | 西安交通大学 | A kind of paired running turbocompressor control method and control system |
| CN108708872B (en) * | 2018-04-26 | 2019-10-11 | 西安交通大学 | A kind of paired running turbocompressor control method and control system |
| CN109146269A (en) * | 2018-08-07 | 2019-01-04 | 中国华电科工集团有限公司 | The accurate distribution method of unit load when a kind of Isolated Network System line fault |
| CN109782584A (en) * | 2019-01-21 | 2019-05-21 | 杭州澎康自动化科技有限公司 | A kind of pumping back type steam turbine self-adjusting control |
| CN112803438A (en) * | 2021-02-25 | 2021-05-14 | 中国五环工程有限公司 | Frequency control system and method for multiple generators in isolated network operation power plant |
| CN114922701A (en) * | 2022-05-25 | 2022-08-19 | 哈尔滨汽轮机厂有限责任公司 | Three-furnace two-machine main pipe system biomass power plant steam turbine pressure and power control system |
| CN114922701B (en) * | 2022-05-25 | 2023-09-05 | 哈尔滨汽轮机厂有限责任公司 | Pressure and power control system of three-furnace two-machine main pipe biomass power plant steam turbine |
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