CN108565854A - Analogy method and system for reappearing power system frequency characteristic - Google Patents
Analogy method and system for reappearing power system frequency characteristic Download PDFInfo
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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
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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Abstract
The present invention provides a kind of analogy methods and system for reappearing power system frequency characteristic, are related to technical field of power systems.Method includes：According to the system frequency value of current time t, load active power is determined using pre-set load model；According to pre-set fuel reference signal and pitch aperture, air inlet magnitude is determined using pre-set main vapour pressure model；The mechanical output of steam turbine model is determined using pre-set steam turbine model；Electromagnetic power is generated using pre-set generating set model；According to electromagnetic power, fired power generating unit output power is generated by pre-set synchronous machine element；According to load active power and fired power generating unit output power, the system frequency predicted value that equation determines the subsequent time t+1 of current time t is waved using synchronous machine, and using the system frequency predicted value of subsequent time t+1 as the system frequency value at t+1 moment；Power system frequency characteristic is determined according to the system frequency predicted value at each moment.
Description
Technical field
The present invention relates to technical field of power systems more particularly to a kind of simulations for reappearing power system frequency characteristic
Method and system.
Background technology
Currently, with the fast development of the new energy technologies such as wind-power electricity generation, photovoltaic generation, new energy technology generates electricity in power grid
In accounting increasingly rise.As new energy technology power generation accounting in power grid is higher and higher, the frequency characteristic in electric system
There is larger differences with the frequency characteristic of the electric system before based on fired power generating unit.
In order to study characteristic of the new energy technology power generation in power grid, need first to carry out existing power system frequency characteristic
Reproduction research.However, existing power system digital simulation model is difficult to reflect the frequency characteristic of electric system of new generation, especially
It is to be difficult to reappear frequency characteristic of the electric system after there is high-power vacancy failure.
Invention content
The embodiment of the present invention provides a kind of analogy method and system for reappearing power system frequency characteristic, to realize
Accurate reproduction to current power system response has established base for characteristic of the research new energy technology power generation in power grid
Plinth.
In order to achieve the above objectives, the present invention adopts the following technical scheme that：
A kind of analogy method for reappearing power system frequency characteristic, including：
According to the system frequency value of current time t, load active power is determined using pre-set load model；
According to pre-set fuel reference signal and pitch aperture, using pre-set main vapour pressure model determine into
Tolerance value；
According to the air inlet magnitude, the mechanical output of steam turbine model is determined using pre-set steam turbine model；
According to the mechanical output, electromagnetic power is generated using pre-set generating set model；
According to the electromagnetic power, fired power generating unit output power is generated by pre-set synchronous machine element；
According to the load active power and the fired power generating unit output power, equation is waved using synchronous machine and is determined currently
The system frequency predicted value of the subsequent time t+1 of moment t, and using the system frequency predicted value of subsequent time t+1 as the t+1 moment
System frequency value；
Power system frequency characteristic is determined according to the system frequency predicted value at each moment.
Specifically, the system frequency value according to current time t, determines that load has using pre-set load model
Work(power, including：
System frequency value of the system frequency predicted value of t moment as t moment is obtained, or t moment is obtained by sampling
System frequency value of the system frequency actual value as t moment；
Using pre-set load model：Pt=PN(1+(fN-fst)×LD) determine the load active-power P of t momentt；
Wherein, PNFor load rated active power；fNFor system nominal frequency；fstFor the system frequency value of t moment；LDFor
Load coefficient of frequency modulation.
Specifically, it is described according to pre-set fuel reference signal and pitch aperture, using pre-set main vapour pressure
Power model determines air inlet magnitude, including：
According to pre-set fuel reference signal RrefWith a main vapour pressure initial value GZ0, obtained by pi controller
To pi controller output signal RrefPI；
According to pi controller output signal RrefPI, using formula：Determine the flow L of main vapour pressure model；Its
In, TwFor the time constant of boiler oil release；S is the signal that frequency is indicated in Fourier transformation；L0For main vapour pressure model
Flow initial value；TDFor drum accumulation of heat volume time constant；U is superheater and live steam piping discharge coefficient；
Pitch aperture is obtained from pre-set prime mover and investigation model, according to the flow L of the main vapour pressure model,
Using formula：Determine air inlet magnitude GJ；Wherein, GJ0For the first of air inlet magnitude
Value；TshFor superheater volume time constant；MDFor the pitch aperture.
Specifically, according to the air inlet magnitude, the machinery of steam turbine model is determined using pre-set steam turbine model
Power, including：
According to the air inlet magnitude GJ, using pre-set steam turbine model：Determine steam turbine model
Mechanical output Pm；Wherein, TchFor vapor volume time constant；FHPFor high pressure cylinder power proportions；FIPFor intermediate pressure cylinder power proportions；
TrhFor reheater time constant；FLPFor low pressure (LP) cylinder power proportions；TcoCross pipe time constant.
Specifically, according to the load active power and the fired power generating unit output power, equation is waved using synchronous machine
It determines the system frequency predicted value of the subsequent time t+1 of current time t, and the system frequency predicted value of subsequent time t+1 is made
For the system frequency value at t+1 moment, including：
According to the load active-power P of t momenttWith the fired power generating unit output power, equation is waved using synchronous machine：The system for determining the subsequent time t+1 of current time t
Frequency predication value fout,t+1；Wherein, JhFor fired power generating unit inertia coeffeicent；PhFor the fired power generating unit output power；KfFor thermal motor
Group coefficient of frequency modulation；
Using the system frequency predicted value of subsequent time t+1 as the system frequency value at t+1 moment.
A kind of simulation system for reappearing power system frequency characteristic, including：
Load model unit is determined for the system frequency value according to current time t using pre-set load model
Load active power；
Main vapour pressure model unit, for according to pre-set fuel reference signal and pitch aperture, using setting in advance
The main vapour pressure model set determines air inlet magnitude；
Steam turbine model unit, for according to the air inlet magnitude, steamer to be determined using pre-set steam turbine model
The mechanical output of machine model；
Generating set model unit, for according to the mechanical output, being generated using pre-set generating set model
Electromagnetic power；
Fired power generating unit output power generation unit is used for according to the electromagnetic power, by pre-set synchronous machine member
Part generates fired power generating unit output power；
Power system frequency properties determining unit, for according to the load active power and the fired power generating unit output work
Rate waves the system frequency predicted value that equation determines the subsequent time t+1 of current time t using synchronous machine, and by subsequent time t
System frequency value of+1 system frequency predicted value as the t+1 moment；Electric power is determined according to the system frequency predicted value at each moment
System response.
In addition, the load model unit, is specifically used for：
System frequency value of the system frequency predicted value of t moment as t moment is obtained, or t moment is obtained by sampling
System frequency value of the system frequency actual value as t moment；
Using pre-set load model：Pt=PN(1+(fN-fst)×LD) determine the load active-power P of t momentt；
Wherein, PNFor load rated active power；fNFor system nominal frequency；fstFor the system frequency value of t moment；LDFor
Load coefficient of frequency modulation.
In addition, the main vapour pressure model unit, is specifically used for：
According to pre-set fuel reference signal RrefWith a main vapour pressure initial value GZ0, obtained by pi controller
To pi controller output signal RrefPI；
According to pi controller output signal RrefPI, using formula：Determine the flow L of main vapour pressure model；Its
In, TwFor the time constant of boiler oil release；S is the signal that frequency is indicated in Fourier transformation；L0For main vapour pressure model
Flow initial value；TDFor drum accumulation of heat volume time constant；U is superheater and live steam piping discharge coefficient；
Pitch aperture is obtained from pre-set prime mover and investigation model, according to the flow L of the main vapour pressure model,
Using formula：Determine air inlet magnitude GJ；Wherein, GJ0For the first of air inlet magnitude
Value；TshFor superheater volume time constant；MDFor the pitch aperture.
In addition, the steam turbine model unit, is specifically used for：
According to the air inlet magnitude GJ, using pre-set steam turbine model：Determine steam turbine model
Mechanical output Pm；Wherein, TchFor vapor volume time constant；FHPFor high pressure cylinder power proportions；FIPFor intermediate pressure cylinder power proportions；
TrhFor reheater time constant；FLPFor low pressure (LP) cylinder power proportions；TcoCross pipe time constant.
In addition, the power system frequency properties determining unit, is specifically used for；
According to the load active-power P of t momenttWith the fired power generating unit output power, equation is waved using synchronous machine：The system for determining the subsequent time t+1 of current time t
Frequency predication value fout,t+1；Wherein, JhFor fired power generating unit inertia coeffeicent；PhFor the fired power generating unit output power；KfFor thermal motor
Group coefficient of frequency modulation；
Using the system frequency predicted value of subsequent time t+1 as the system frequency value at t+1 moment.
A kind of computer readable storage medium, is stored thereon with computer program, which realizes when being executed by processor
Following steps：
According to the system frequency value of current time t, load active power is determined using pre-set load model；
According to pre-set fuel reference signal and pitch aperture, using pre-set main vapour pressure model determine into
Tolerance value；
According to the air inlet magnitude, the mechanical output of steam turbine model is determined using pre-set steam turbine model；
According to the mechanical output, electromagnetic power is generated using pre-set generating set model；
According to the electromagnetic power, fired power generating unit output power is generated by pre-set synchronous machine element；
According to the load active power and the fired power generating unit output power, equation is waved using synchronous machine and is determined currently
The system frequency predicted value of the subsequent time t+1 of moment t, and using the system frequency predicted value of subsequent time t+1 as the t+1 moment
System frequency value；
Power system frequency characteristic is determined according to the system frequency predicted value at each moment.
A kind of computer equipment, including memory, processor and the meter that is stored in storage above and can run on a processor
Calculation machine program, the processor realize following steps when executing described program：
According to the system frequency value of current time t, load active power is determined using pre-set load model；
According to pre-set fuel reference signal and pitch aperture, using pre-set main vapour pressure model determine into
Tolerance value；
According to the air inlet magnitude, the mechanical output of steam turbine model is determined using pre-set steam turbine model；
According to the mechanical output, electromagnetic power is generated using pre-set generating set model；
According to the electromagnetic power, fired power generating unit output power is generated by pre-set synchronous machine element；
According to the load active power and the fired power generating unit output power, equation is waved using synchronous machine and is determined currently
The system frequency predicted value of the subsequent time t+1 of moment t, and using the system frequency predicted value of subsequent time t+1 as the t+1 moment
System frequency value；
Power system frequency characteristic is determined according to the system frequency predicted value at each moment.
Analogy method and system provided in an embodiment of the present invention for reappearing power system frequency characteristic, first basis are worked as
The system frequency value of preceding moment t determines load active power using pre-set load model；Later according to pre-set
Fuel reference signal and pitch aperture determine air inlet magnitude using pre-set main vapour pressure model；According to the air inflow
Value, the mechanical output of steam turbine model is determined using pre-set steam turbine model；According to the mechanical output, using advance
The generating set model of setting generates electromagnetic power；According to the electromagnetic power, according to the electromagnetic power, by pre-setting
Synchronous machine element generate fired power generating unit output power；Generate fired power generating unit output power；According to the load active power and
The fired power generating unit output power waves equation using synchronous machine and determines that the system frequency of the subsequent time t+1 of current time t is pre-
Measured value, and using the system frequency predicted value of subsequent time t+1 as the system frequency value at t+1 moment；According to the system at each moment
Frequency predication value determines power system frequency characteristic.As it can be seen that the embodiment of the present invention may be implemented to current power system frequency spy
Property accurate reproduction, lay a good foundation for characteristic of the research new energy technology power generation in power grid.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention without having to pay creative labor, may be used also for those of ordinary skill in the art
With obtain other attached drawings according to these attached drawings.
Fig. 1 is a kind of flow chart for reappearing the analogy method of power system frequency characteristic provided in an embodiment of the present invention
One；
Fig. 2 is the schematic diagram one of the simulation model system in the embodiment of the present invention；
Fig. 3 is a kind of flow chart for reappearing the analogy method of power system frequency characteristic provided in an embodiment of the present invention
Two；
Fig. 4 is the logical schematic of the main vapour pressure model in the embodiment of the present invention；
Fig. 5 is the logical schematic of the steam turbine model in the embodiment of the present invention；
Fig. 6 is the schematic diagram two of the simulation model system in the embodiment of the present invention；
Fig. 7 is pair of the frequency characteristic of the power system frequency characteristic curve and real system in the embodiment of the present invention
Compare schematic diagram；
Fig. 8 is the structural representation provided in an embodiment of the present invention for reappearing the simulation system of power system frequency characteristic
Figure.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
As shown in Figure 1, the embodiment of the present invention provides a kind of analogy method for reappearing power system frequency characteristic, packet
It includes：
Step 101, the system frequency value according to current time t, determine that load is active using pre-set load model
Power.
Step 102, according to pre-set fuel reference signal and pitch aperture, using pre-set main vapour pressure mould
Type determines air inlet magnitude.
Step 103, according to the air inlet magnitude, the machinery of steam turbine model is determined using pre-set steam turbine model
Power.
Step 104, according to the mechanical output, electromagnetic power is generated using pre-set generating set model.
Step 105, according to the electromagnetic power, generate fired power generating unit output work by pre-set synchronous machine element
Rate.
Step 106, according to the load active power and the fired power generating unit output power, equation is waved using synchronous machine
It determines the system frequency predicted value of the subsequent time t+1 of current time t, and the system frequency predicted value of subsequent time t+1 is made
For the system frequency value at t+1 moment.
101 can be returned to step after step 106, by the continuous iteration of step 101 to step 106, finally
The system frequency predicted value at each moment can be formed, and then executes subsequent step 107.
Step 107 determines power system frequency characteristic according to the system frequency predicted value at each moment.
Analogy method provided in an embodiment of the present invention for reappearing power system frequency characteristic, first according to current time
The system frequency value of t determines load active power using pre-set load model；Joined later according to pre-set fuel
Signal and pitch aperture are examined, air inlet magnitude is determined using pre-set main vapour pressure model；According to the air inlet magnitude, use
Pre-set steam turbine model determines the mechanical output of steam turbine model；According to the mechanical output, use is pre-set
Generating set model generates electromagnetic power；According to the electromagnetic power, thermal motor is generated by pre-set synchronous machine element
Group output power；According to the load active power and the fired power generating unit output power, equation is waved using synchronous machine and is determined
The system frequency predicted value of the subsequent time t+1 of current time t, and using the system frequency predicted value of subsequent time t+1 as t+1
The system frequency value at moment；Power system frequency characteristic is determined according to the system frequency predicted value at each moment.As it can be seen that the present invention is real
Example is applied by partly being modeled key equipment, component, the device etc. in electric system, it can be achieved that current power system frequency
The accurate reproduction of rate characteristic, to study characteristic of the new energy technology power generation in power grid, such as frequency modulation measure effect, analysis system frequency
Rate stability etc. is laid a good foundation.
For above-mentioned pre-set load model, main vapour pressure model, steam turbine model, generating set model and same
Step machine element, as shown in Fig. 2, following simulation model system realization can be used in the embodiment of the present invention, including：Load model 21, master
Steam pressure model 22, steam turbine model 23, generating set model 24 and synchronous machine element 25, in addition, the tune in above-mentioned steps 102
Door aperture can be given by a prime mover and investigation model 26, above-mentioned main vapour pressure model 22, steam turbine model 23, generator
Group model 24, synchronous machine element 25 and prime mover and investigation model 26 constitute entire fired power generating unit model 20.In addition, in load
The resistance and capacitor model 27 for transmission line simulation actual conditions are provided between model 21 and fired power generating unit model 20.It is right
The correlation modeling method and model of prime mover and investigation model 26 and generating set model 24 in fired power generating unit model 20, with
And synchronous machine element 25, correlative study is had existed in the prior art, will not repeated, and can specifically joined in embodiments of the present invention
Examine following document：(military sincere, Xu Zheng, Ni Qiulong wait prime mover and governor modeling and parameter identification based on response characteristic
[J] electrotechnics journals, 2012,27 (6)：226-231.).For load model 21, main vapour pressure model 22, steam turbine mould
The specific implementation of type 23, also see subsequent embodiment.
In order to make those skilled in the art be better understood by the present invention, a more detailed embodiment is set forth below,
As shown in figure 3, the embodiment of the present invention provides a kind of analogy method for reappearing power system frequency characteristic, including：
Step 301 obtains system frequency value of the system frequency predicted value of t moment as t moment, or is obtained by sampling
Take the system frequency actual value of t moment as the system frequency value of t moment.
Step 302, using pre-set load model：Pt=PN(1+(fN-fst)×LD) determine that the load of t moment has
Work(power Pt。
Wherein, PNFor load rated active power；fNFor system nominal frequency；fstFor the system frequency value of t moment；LDFor
Load coefficient of frequency modulation.
Step 303, according to pre-set fuel reference signal RrefWith a main vapour pressure initial value GZ0, by proportional integration
Controller obtains pi controller output signal RrefPI。
Wherein, fuel reference signal RrefIt is generally set 1 (perunit value).
Step 304, according to pi controller output signal RrefPI, using formula：Determine the flow L of main vapour pressure model.
Wherein, TwFor the time constant of boiler oil release；S is the signal that frequency is indicated in Fourier transformation；L0For main vapour
The flow initial value of pressure model；TDFor drum accumulation of heat volume time constant；U is superheater and live steam piping discharge coefficient.
Step 305 obtains pitch aperture from pre-set prime mover and investigation model, according to the main vapour pressure model
Flow L, using formula：Determine air inlet magnitude GJ；Wherein, GJ0For air inflow
The initial value of value；TshFor superheater volume time constant；MDFor the pitch aperture.
For above-mentioned steps 303 to step 305, which may be used realization method as shown in Figure 4,
Wherein PI is pi controller.
Step 306, according to the air inlet magnitude GJ, using pre-set steam turbine model：Determine steam turbine model
Mechanical output Pm。
Wherein, TchFor vapor volume time constant；FHPFor high pressure cylinder power proportions；FIPFor intermediate pressure cylinder power proportions；TrhFor
Reheater time constant；FLPFor low pressure (LP) cylinder power proportions；TcoCross pipe time constant.
For above-mentioned steps 306, which may be used realization method as shown in Figure 5.
Step 307, according to the mechanical output, electromagnetic power is generated using pre-set generating set model.
Step 308, according to the electromagnetic power, generate fired power generating unit output work by pre-set synchronous machine element
Rate.
Step 309, the load active-power P according to t momenttWith the fired power generating unit output power, shaken using synchronous machine
Put equation：Determine the subsequent time t+ of current time t
1 system frequency predicted value fout,t+1。
Wherein, JhFor fired power generating unit inertia coeffeicent；PhFor the fired power generating unit output power；KfFor fired power generating unit frequency modulation system
Number.
Step 310, using the system frequency predicted value of subsequent time t+1 as the system frequency value at t+1 moment.
After step 310, it can return to and execute step 301, to which the iteration gradually Jing Guo step 301 to step 310 can
With formed each moment (t, t+1, t+2 ..., t+n) system frequency predicted value.In this way when subsequently continuing to execute step 311,
Have：
Step 311 determines power system frequency characteristic according to the system frequency predicted value at each moment.
Illustrate the above-mentioned steps 301 of the embodiment of the present invention to the effect of step 311 with reference to one group of detailed data：
Corresponding to above-mentioned simulation model system as shown in Figure 2, by combining 22 He of main vapour pressure model as shown in Figure 4
Steam turbine model 23 as shown in Figure 5, and combine already existing prime mover and investigation model, generating set mould in the prior art
Type 24 and synchronous machine element 25, can form the specific example of simulation model system as shown in FIG. 6.
Each relevant parameter is as shown in table 1 in simulation model system wherein as shown in FIG. 6：
Table 1：
301 is as shown in Figure 7 to the finally formed power system frequency characteristic curve of step 311 through the above steps, it is seen that：
The frequency characteristic of finally formed power system frequency indicatrix (simulation model curve) and real system of the embodiment of the present invention
It is sufficiently close to, therefore the embodiment of the present invention can reappear power system frequency characteristic completely.
Analogy method provided in an embodiment of the present invention for reappearing power system frequency characteristic, by electric system
The part such as key equipment, component, device modeled the accurate reproduction, it can be achieved that current power system response, be
Characteristic of the new energy technology power generation in power grid is studied, such as frequency modulation measure effect, analysis of frequency stability have established base
Plinth.
Corresponding to above-mentioned Fig. 1 and embodiment of the method shown in Fig. 3, it is used for as shown in figure 8, the embodiment of the present invention provides one kind
Reappear the simulation system of power system frequency characteristic, including：
Load model unit 41, it is true using pre-set load model for the system frequency value according to current time t
Constant load active power.
Main vapour pressure model unit 42 is used for according to pre-set fuel reference signal and pitch aperture, using advance
The main vapour pressure model of setting determines air inlet magnitude.
Steam turbine model unit 43, for according to the air inlet magnitude, vapour to be determined using pre-set steam turbine model
The mechanical output of turbine model.
Generating set model unit 44, for according to the mechanical output, being given birth to using pre-set generating set model
At electromagnetic power.
Fired power generating unit output power generation unit 45 is used for according to the electromagnetic power, by pre-set synchronous machine
Element generates fired power generating unit output power.
Power system frequency properties determining unit 46, for being exported according to the load active power and the fired power generating unit
Power waves the system frequency predicted value that equation determines the subsequent time t+1 of current time t using synchronous machine, and by lower a period of time
Carve system frequency value of the system frequency predicted value of t+1 as the t+1 moment；Electricity is determined according to the system frequency predicted value at each moment
Force system frequency characteristic.
In addition, the load model unit 41, is specifically used for：
System frequency value of the system frequency predicted value of t moment as t moment is obtained, or t moment is obtained by sampling
System frequency value of the system frequency actual value as t moment.
Using pre-set load model：Pt=PN(1+(fN-fst)×LD) determine the load active-power P of t momentt。
Wherein, PNFor load rated active power；fNFor system nominal frequency；fstFor the system frequency value of t moment；LDFor
Load coefficient of frequency modulation.
In addition, the main vapour pressure model unit 42, is specifically used for：
According to pre-set fuel reference signal RrefWith a main vapour pressure initial value GZ0, obtained by pi controller
To pi controller output signal RrefPI。
According to pi controller output signal RrefPI, using formula：Determine the flow L of main vapour pressure model；Its
In, TwFor the time constant of boiler oil release；S is the signal that frequency is indicated in Fourier transformation；L0For main vapour pressure model
Flow initial value；TDFor drum accumulation of heat volume time constant；U is superheater and live steam piping discharge coefficient.
Pitch aperture is obtained from pre-set prime mover and investigation model, according to the flow L of the main vapour pressure model,
Using formula：Determine air inlet magnitude GJ；Wherein, GJ0For the first of air inlet magnitude
Value；TshFor superheater volume time constant；MDFor the pitch aperture.
In addition, the steam turbine model unit 43, is specifically used for：
According to the air inlet magnitude GJ, using pre-set steam turbine model：Determine steam turbine model
Mechanical output Pm；Wherein, TchFor vapor volume time constant；FHPFor high pressure cylinder power proportions；FIPFor intermediate pressure cylinder power proportions；
TrhFor reheater time constant；FLPFor low pressure (LP) cylinder power proportions；TcoCross pipe time constant.
In addition, the power system frequency properties determining unit 46, is specifically used for；
According to the load active-power P of t momenttWith the fired power generating unit output power, equation is waved using synchronous machine：The system for determining the subsequent time t+1 of current time t
Frequency predication value fout,t+1；Wherein, JhFor fired power generating unit inertia coeffeicent；PhFor the fired power generating unit output power；KfFor thermal motor
Group coefficient of frequency modulation.
Using the system frequency predicted value of subsequent time t+1 as the system frequency value at t+1 moment.
Simulation system provided in an embodiment of the present invention for reappearing power system frequency characteristic, by electric system
The part such as key equipment, component, device modeled the accurate reproduction, it can be achieved that current power system response, be
Characteristic of the new energy technology power generation in power grid is studied, such as frequency modulation measure effect, analysis of frequency stability have established base
Plinth.
In addition, the embodiment of the present invention also provides a kind of computer readable storage medium, it is stored thereon with computer program, it should
Following steps are realized when program is executed by processor：
According to the system frequency value of current time t, load active power is determined using pre-set load model.
According to pre-set fuel reference signal and pitch aperture, using pre-set main vapour pressure model determine into
Tolerance value.
According to the air inlet magnitude, the mechanical output of steam turbine model is determined using pre-set steam turbine model.
According to the mechanical output, electromagnetic power is generated using pre-set generating set model.
According to the electromagnetic power, fired power generating unit output power is generated by pre-set synchronous machine element.
According to the load active power and the fired power generating unit output power, equation is waved using synchronous machine and is determined currently
The system frequency predicted value of the subsequent time t+1 of moment t, and using the system frequency predicted value of subsequent time t+1 as the t+1 moment
System frequency value.
Power system frequency characteristic is determined according to the system frequency predicted value at each moment.
In addition, the embodiment of the present invention also provides a kind of computer equipment, including memory, processor and it is stored in storage
And the computer program that can be run on a processor, the processor realize following steps when executing described program：
According to the system frequency value of current time t, load active power is determined using pre-set load model.
According to pre-set fuel reference signal and pitch aperture, using pre-set main vapour pressure model determine into
Tolerance value.
According to the air inlet magnitude, the mechanical output of steam turbine model is determined using pre-set steam turbine model.
According to the mechanical output, electromagnetic power is generated using pre-set generating set model.
According to the electromagnetic power, fired power generating unit output power is generated by pre-set synchronous machine element.
According to the load active power and the fired power generating unit output power, equation is waved using synchronous machine and is determined currently
The system frequency predicted value of the subsequent time t+1 of moment t, and using the system frequency predicted value of subsequent time t+1 as the t+1 moment
System frequency value.
Power system frequency characteristic is determined according to the system frequency predicted value at each moment.
It should be understood by those skilled in the art that, the embodiment of the present invention can be provided as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the present invention
Apply the form of example.Moreover, the present invention can be used in one or more wherein include computer usable program code computer
The computer program production implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.)
The form of product.
The present invention be with reference to according to the method for the embodiment of the present invention, the flow of equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that can be realized by computer program instructions every first-class in flowchart and/or the block diagram
The combination of flow and/or box in journey and/or box and flowchart and/or the block diagram.These computer programs can be provided
Instruct the processor of all-purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine so that the instruction executed by computer or the processor of other programmable data processing devices is generated for real
The device for the function of being specified in present one flow of flow chart or one box of multiple flows and/or block diagram or multiple boxes.
These computer program instructions, which may also be stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that instruction generation stored in the computer readable memory includes referring to
Enable the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one box of block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device so that count
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, in computer or
The instruction executed on other programmable devices is provided for realizing in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Specific embodiment is applied in the present invention, and principle and implementation of the present invention are described, above example
Explanation be merely used to help understand the present invention method and its core concept；Meanwhile for those of ordinary skill in the art,
According to the thought of the present invention, there will be changes in the specific implementation manner and application range, in conclusion in this specification
Appearance should not be construed as limiting the invention.
Claims (12)
1. a kind of analogy method for reappearing power system frequency characteristic, which is characterized in that including：
According to the system frequency value of current time t, load active power is determined using pre-set load model；
According to pre-set fuel reference signal and pitch aperture, air inflow is determined using pre-set main vapour pressure model
Value；
According to the air inlet magnitude, the mechanical output of steam turbine model is determined using pre-set steam turbine model；
According to the mechanical output, electromagnetic power is generated using pre-set generating set model；
According to the electromagnetic power, fired power generating unit output power is generated by pre-set synchronous machine element；
According to the load active power and the fired power generating unit output power, equation is waved using synchronous machine and determines current time
The system frequency predicted value of the subsequent time t+1 of t, and be as the t+1 moment using the system frequency predicted value of subsequent time t+1
System frequency values；
Power system frequency characteristic is determined according to the system frequency predicted value at each moment.
2. the analogy method according to claim 1 for reappearing power system frequency characteristic, which is characterized in that described
According to the system frequency value of current time t, load active power is determined using pre-set load model, including：
System frequency value of the system frequency predicted value of t moment as t moment is obtained, or is by what sampling obtained t moment
System frequency value of the frequency actual value of uniting as t moment；
Using pre-set load model：Pt=PN(1+(fN-fst)×LD) determine the load active-power P of t momentt；
Wherein, PNFor load rated active power；fNFor system nominal frequency；fstFor the system frequency value of t moment；LDFor load
Coefficient of frequency modulation.
3. the analogy method according to claim 2 for reappearing power system frequency characteristic, which is characterized in that described
According to pre-set fuel reference signal and pitch aperture, air inlet magnitude is determined using pre-set main vapour pressure model, is wrapped
It includes：
According to pre-set fuel reference signal RrefWith a main vapour pressure initial value GZ0, compared by pi controller
Example integral controller output signal RrefPI；
According to pi controller output signal RrefPI, using formula：Determine the flow L of main vapour pressure model；Its
In, TwFor the time constant of boiler oil release；S is the signal that frequency is indicated in Fourier transformation；L0For main vapour pressure model
Flow initial value；TDFor drum accumulation of heat volume time constant；U is superheater and live steam piping discharge coefficient；
Pitch aperture is obtained from pre-set prime mover and investigation model, according to the flow L of the main vapour pressure model, is used
Formula：Determine air inlet magnitude GJ；Wherein, GJ0For the initial value of air inlet magnitude；Tsh
For superheater volume time constant；MDFor the pitch aperture.
4. the analogy method according to claim 3 for reappearing power system frequency characteristic, which is characterized in that according to institute
Air inlet magnitude is stated, the mechanical output of steam turbine model is determined using pre-set steam turbine model, including：
According to the air inlet magnitude GJ, using pre-set steam turbine model：Determine steam turbine model
Mechanical output Pm；Wherein, TchFor vapor volume time constant；FHPFor high pressure cylinder power proportions；FIPFor intermediate pressure cylinder power proportions；
TrhFor reheater time constant；FLPFor low pressure (LP) cylinder power proportions；TcoCross pipe time constant.
5. the analogy method according to claim 4 for reappearing power system frequency characteristic, which is characterized in that according to institute
Load active power and the fired power generating unit output power are stated, lower a period of time that equation determines current time t is waved using synchronous machine
The system frequency predicted value of t+1 is carved, and using the system frequency predicted value of subsequent time t+1 as the system frequency value at t+1 moment,
Including：
According to the load active-power P of t momenttWith the fired power generating unit output power, equation is waved using synchronous machine：The system for determining the subsequent time t+1 of current time t
Frequency predication value fout,t+1；Wherein, JhFor fired power generating unit inertia coeffeicent；PhFor the fired power generating unit output power；KfFor thermal motor
Group coefficient of frequency modulation；
Using the system frequency predicted value of subsequent time t+1 as the system frequency value at t+1 moment.
6. a kind of simulation system for reappearing power system frequency characteristic, which is characterized in that including：
Load model unit determines load for the system frequency value according to current time t using pre-set load model
Active power；
Main vapour pressure model unit, for pre-set according to pre-set fuel reference signal and pitch aperture, use
Main vapour pressure model determines air inlet magnitude；
Steam turbine model unit, for according to the air inlet magnitude, steam turbine mould to be determined using pre-set steam turbine model
The mechanical output of type；
Generating set model unit, for according to the mechanical output, electromagnetism to be generated using pre-set generating set model
Power；
Fired power generating unit output power generation unit, for according to the electromagnetic power, being given birth to by pre-set synchronous machine element
At fired power generating unit output power；
Power system frequency properties determining unit is used for according to the load active power and the fired power generating unit output power,
The system frequency predicted value that equation determines the subsequent time t+1 of current time t is waved using synchronous machine, and by subsequent time t+1
System frequency value of the system frequency predicted value as the t+1 moment；Power train is determined according to the system frequency predicted value at each moment
System frequency characteristic.
7. the simulation system according to claim 6 for reappearing power system frequency characteristic, which is characterized in that described negative
Lotus model unit, is specifically used for：
System frequency value of the system frequency predicted value of t moment as t moment is obtained, or is by what sampling obtained t moment
System frequency value of the frequency actual value of uniting as t moment；
Using pre-set load model：Pt=PN(1+(fN-fst)×LD) determine the load active-power P of t momentt；
Wherein, PNFor load rated active power；fNFor system nominal frequency；fstFor the system frequency value of t moment；LDFor load
Coefficient of frequency modulation.
8. the simulation system according to claim 7 for reappearing power system frequency characteristic, which is characterized in that the master
Steam pressure model unit, is specifically used for：
According to pre-set fuel reference signal RrefWith a main vapour pressure initial value GZ0, compared by pi controller
Example integral controller output signal RrefPI；
According to pi controller output signal RrefPI, using formula：Determine the flow L of main vapour pressure model；Its
In, TwFor the time constant of boiler oil release；S is the signal that frequency is indicated in Fourier transformation；L0For main vapour pressure model
Flow initial value；TDFor drum accumulation of heat volume time constant；U is superheater and live steam piping discharge coefficient；
Pitch aperture is obtained from pre-set prime mover and investigation model, according to the flow L of the main vapour pressure model, is used
Formula：Determine air inlet magnitude GJ；Wherein, GJ0For the initial value of air inlet magnitude；Tsh
For superheater volume time constant；MDFor the pitch aperture.
9. the simulation system according to claim 8 for reappearing power system frequency characteristic, which is characterized in that the vapour
Turbine model unit, is specifically used for：
According to the air inlet magnitude GJ, using pre-set steam turbine model：Determine steam turbine model
Mechanical output Pm；Wherein, TchFor vapor volume time constant；FHPFor high pressure cylinder power proportions；FIPFor intermediate pressure cylinder power proportions；
TrhFor reheater time constant；FLPFor low pressure (LP) cylinder power proportions；TcoCross pipe time constant.
10. the simulation system according to claim 9 for reappearing power system frequency characteristic, which is characterized in that described
Power system frequency properties determining unit, is specifically used for；
According to the load active-power P of t momenttWith the fired power generating unit output power, equation is waved using synchronous machine：The system for determining the subsequent time t+1 of current time t
Frequency predication value fout,t+1；Wherein, JhFor fired power generating unit inertia coeffeicent；PhFor the fired power generating unit output power；KfFor thermal motor
Group coefficient of frequency modulation；
Using the system frequency predicted value of subsequent time t+1 as the system frequency value at t+1 moment.
11. a kind of computer readable storage medium, is stored thereon with computer program, which is characterized in that the program is by processor
Following steps are realized when execution：
According to the system frequency value of current time t, load active power is determined using pre-set load model；
According to pre-set fuel reference signal and pitch aperture, air inflow is determined using pre-set main vapour pressure model
Value；
According to the air inlet magnitude, the mechanical output of steam turbine model is determined using pre-set steam turbine model；
According to the mechanical output, electromagnetic power is generated using pre-set generating set model；
According to the electromagnetic power, fired power generating unit output power is generated by pre-set synchronous machine element；
According to the load active power and the fired power generating unit output power, equation is waved using synchronous machine and determines current time
The system frequency predicted value of the subsequent time t+1 of t, and be as the t+1 moment using the system frequency predicted value of subsequent time t+1
System frequency values；
Power system frequency characteristic is determined according to the system frequency predicted value at each moment.
12. a kind of computer equipment, including memory, processor and the calculating that is stored in storage above and can run on a processor
Machine program, which is characterized in that the processor realizes following steps when executing described program：
According to the system frequency value of current time t, load active power is determined using pre-set load model；
According to pre-set fuel reference signal and pitch aperture, air inflow is determined using pre-set main vapour pressure model
Value；
According to the air inlet magnitude, the mechanical output of steam turbine model is determined using pre-set steam turbine model；
According to the mechanical output, electromagnetic power is generated using pre-set generating set model；
According to the electromagnetic power, fired power generating unit output power is generated by pre-set synchronous machine element；
According to the load active power and the fired power generating unit output power, equation is waved using synchronous machine and determines current time
The system frequency predicted value of the subsequent time t+1 of t, and be as the t+1 moment using the system frequency predicted value of subsequent time t+1
System frequency values；
Power system frequency characteristic is determined according to the system frequency predicted value at each moment.
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| WO2020199644A1 (en) * | 2019-04-04 | 2020-10-08 | 华北电力科学研究院有限责任公司 | Prime mover simulation method and apparatus, and multi-machine synchronization system frequency characteristic simulation system |
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