CN115622088A - Primary frequency modulation closed-loop processing method and device based on integral electric quantity - Google Patents
Primary frequency modulation closed-loop processing method and device based on integral electric quantity Download PDFInfo
- Publication number
- CN115622088A CN115622088A CN202211618586.9A CN202211618586A CN115622088A CN 115622088 A CN115622088 A CN 115622088A CN 202211618586 A CN202211618586 A CN 202211618586A CN 115622088 A CN115622088 A CN 115622088A
- Authority
- CN
- China
- Prior art keywords
- frequency modulation
- electric quantity
- instruction
- integral electric
- primary frequency
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000003672 processing method Methods 0.000 title claims abstract description 28
- 238000012937 correction Methods 0.000 claims abstract description 55
- 238000012545 processing Methods 0.000 claims abstract description 19
- 238000004364 calculation method Methods 0.000 claims abstract description 14
- 230000006870 function Effects 0.000 claims description 66
- 238000004590 computer program Methods 0.000 claims description 15
- 230000004048 modification Effects 0.000 claims description 11
- 238000012986 modification Methods 0.000 claims description 11
- 230000003247 decreasing effect Effects 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 abstract description 3
- 230000001360 synchronised effect Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 30
- 238000004891 communication Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 8
- 230000009471 action Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 238000004148 unit process Methods 0.000 description 3
- 230000000750 progressive effect Effects 0.000 description 2
- 108010001267 Protein Subunits Proteins 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000005055 memory storage Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Classifications
-
- 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
- H02J3/241—The oscillation concerning frequency
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention provides a primary frequency modulation closed loop processing method and a primary frequency modulation closed loop processing device based on integral electric quantity, wherein the primary frequency modulation closed loop processing method based on the integral electric quantity comprises the following steps: generating a set value of integral electric quantity according to the first frequency difference function; calculating actual integral electric quantity in real time according to the second frequency difference function; the first frequency difference function is generated according to network frequency and frequency modulation load; the second frequency difference function is generated according to the network frequency and the correction value of the comprehensive flow instruction; and correcting a power grid dispatching load instruction and a comprehensive flow instruction according to the set value and the actual integral electric quantity. The invention can realize the synchronous millisecond calculation of the primary frequency modulation integral electric quantity and other core indexes on the unit side control system, and introduce the integral electric quantity index as the regulated quantity into the primary frequency modulation real-time closed-loop control, thereby realizing the accurate control of the unit primary frequency modulation integral electric quantity and other indexes, improving the unit primary frequency modulation performance, and meeting the related set standard.
Description
Technical Field
The application belongs to the technical field of power supply frequency modulation, and particularly relates to a primary frequency modulation closed-loop processing method and device based on integral electric quantity.
Background
With the stable enlargement of the installed scale of new energy, the power generation characteristics of randomness and low inertia impact the frequency stability of a power grid, so that the functions of providing regulation support and safely packing the bottom of a thermal power generating unit are particularly important. In recent years, the number of low-frequency oscillations generated in a power grid is increased year by year, and a thermal power generating unit is urgently needed to further improve the primary frequency modulation supporting capacity.
Taking a thermal power generating unit as an example, the prior art basically follows the design scheme of fig. 1. When the network frequency exceeds a frequency modulation dead zone, a frequency modulation load instruction is formed through a designed frequency difference function 1, and then the total instruction of an AGC load (power network scheduling load instruction) is corrected to ensure the stability of primary frequency modulation; meanwhile, the network frequency signal forms a comprehensive flow increment instruction through a frequency difference function 2, and the comprehensive flow increment instruction is superposed on a comprehensive valve position main instruction of the steam turbine, so that the rapidity of primary frequency modulation is ensured. The thermal generator set control system realizes primary frequency modulation control of the generator set, performance indexes such as primary frequency modulation integral electric quantity are realized on a power grid dispatching side, and a grid-connected performance assessment platform conducts backtracking calculation according to historical data of primary frequency modulation actions of the generator set.
In the method for testing the primary frequency modulation of the thermal power generating unit in the prior art, only a typical implementation scheme of the primary frequency modulation of the thermal power generating unit is provided, and integral electric quantity is not used as a closed-loop control variable, so that the real-time closed-loop adjustment of the primary frequency modulation adjustment process of the thermal power generating unit cannot follow an index of the integral electric quantity, the post-evaluation can be performed only after the primary frequency modulation action is finished, and when the index cannot meet the relevant requirements of a power grid, the compensation control cannot be performed on the finished primary frequency modulation process, so that the integral electric quantity of the primary frequency modulation of the thermal power generating unit cannot meet the standard.
Disclosure of Invention
The invention discloses a primary frequency modulation closed-loop processing method and device based on integral electric quantity, which realize synchronous millisecond-level calculation of core indexes such as primary frequency modulation integral electric quantity and the like in a unit side control system, and introduce the integral electric quantity index into primary frequency modulation real-time closed-loop control as a regulated quantity, thereby realizing accurate control of the indexes such as the primary frequency modulation integral electric quantity and the like of a unit, improving the primary frequency modulation performance of the unit and meeting related set standards.
In order to solve the technical problems, the invention provides the following technical scheme:
in a first aspect, the present invention provides a primary frequency modulation closed loop processing method based on integrated electric quantity, including:
generating a set value of integral electric quantity according to the first frequency difference function;
calculating actual integral electric quantity in real time according to a second frequency difference function; the first frequency difference function is generated according to network frequency and frequency modulation load; the second frequency difference function is generated according to the network frequency and the correction value of the comprehensive flow instruction;
and correcting a power grid dispatching load instruction and a comprehensive flow instruction according to the set value and the actual integral electric quantity.
In an embodiment, the modifying the power grid dispatching load instruction according to the set value and the actual integral electric quantity includes:
calculating a difference between the set value and the actual integrated electric quantity;
inputting the difference value into a first compensation controller to generate a frequency modulation load constant value correction instruction;
and correcting the power grid dispatching load instruction according to the frequency modulation load fixed value correction instruction.
In one embodiment, the step of correcting the integrated flow instruction according to the set value and the actual integrated electric quantity includes:
inputting the difference value into a second compensation controller to generate a flow correction instruction;
and correcting the comprehensive flow instruction according to the flow correction instruction.
In an embodiment, the generating the setting value of the integrated electric quantity according to the first frequency difference function includes:
respectively calculating target power under the condition that the frequency modulation load is increased and decreased according to the rotating speed difference of the steam turbine, the primary frequency modulation dead zone, the rated rotating speed of the steam turbine, the rated load and the primary frequency modulation rotating speed unequal rate;
and generating a set value of the integral electric quantity according to the target power.
In a second aspect, the present invention provides a primary frequency modulation closed loop processing apparatus based on integrated electric quantity, the apparatus comprising:
the set value generating module is used for generating a set value of the integral electric quantity according to the first frequency difference function;
the actual integral electric quantity calculating module is used for calculating actual integral electric quantity in real time according to the second frequency difference function; the first frequency difference function is generated according to network frequency and frequency modulation load; the second frequency difference function is generated according to the network frequency and the correction value of the comprehensive flow instruction;
and the instruction correction module is used for correcting the power grid dispatching load instruction and the comprehensive flow instruction according to the set value and the actual integral electric quantity.
In one embodiment, the instruction modification module includes:
a difference value calculation unit for calculating a difference value between the set value and the actual integrated electric quantity;
the fixed value correction instruction generating unit is used for inputting the difference value into the first compensation controller so as to generate a frequency modulation load fixed value correction instruction;
and the coincidence instruction correcting unit is used for correcting the power grid dispatching load instruction according to the frequency modulation load fixed value correcting instruction.
In one embodiment, the instruction modification module further includes:
a flow correction instruction generating unit, configured to input the difference value into a second compensation controller to generate a flow correction instruction;
and the flow instruction correcting unit is used for correcting the comprehensive flow instruction according to the flow correcting instruction.
In one embodiment, the setting value generating module includes:
the target power calculation unit is used for calculating target power under the condition that the frequency modulation load is increased and decreased respectively according to the rotating speed difference of the steam turbine, the primary frequency modulation dead zone, the rated rotating speed of the steam turbine, the rated load and the primary frequency modulation rotating speed unequal rate;
and the set value generating unit is used for generating a set value of the integral electric quantity according to the target power.
In a third aspect, the present invention provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the integrated power-based chirp-locked loop processing method when executing the program.
In a fourth aspect, the present invention provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of a method for integrated power-based chirp-closed-loop processing.
As can be seen from the foregoing description, an embodiment of the present invention provides a method and an apparatus for processing a primary frequency modulation closed loop based on integrated power, where the corresponding method includes: firstly, generating a set value of integral electric quantity according to a first frequency difference function; then, calculating actual integral electric quantity in real time according to a second frequency difference function; the first frequency difference function is generated according to the network frequency and the frequency modulation load; the second frequency difference function is generated according to the network frequency and the correction value of the comprehensive flow instruction; and finally, correcting the power grid dispatching load instruction and the comprehensive flow instruction according to the set value and the actual integral electric quantity.
On the basis of deeply analyzing the relation between the primary frequency modulation control and the related indexes of the unit, aiming at the problem that the control and the corresponding indexes are disconnected in the actual operation process of the unit, the invention provides an integrated control scheme for changing the related indexes into controlled variables, so as to solve the problem that the primary frequency modulation performance indexes of the thermal power unit cannot meet the requirements of the related indexes. The invention solves the basic common problem of primary frequency modulation grid connection of a thermoelectric generator set in the prior art. The millisecond operation of the integral electric quantity is realized in the unit process controller, and finally the closed-loop control of the integral electric quantity as the controlled quantity is realized, so that the timeliness and the accuracy of the unit primary frequency modulation performance response are improved. To sum up, the comprehensive application of the scheme can greatly improve the integral primary frequency modulation allowance of the power grid, and provide powerful frequency safety guarantee for the construction of a novel power system.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a frame diagram of a typical primary frequency modulation implementation method of a thermal generator set in the prior art;
fig. 2 is a schematic flow chart of a primary frequency modulation closed loop processing method based on integrated electric quantity according to an embodiment of the present invention;
fig. 3 is a block diagram of a primary frequency modulation closed loop processing method based on integrated power according to an embodiment of the present invention;
FIG. 4 is a first flowchart illustrating step 300 according to an embodiment of the present invention;
FIG. 5 is a second flowchart illustrating step 300 according to an embodiment of the present invention;
FIG. 6 is a flowchart illustrating step 100 in an embodiment of the present invention;
FIG. 7 is a diagram of the relationship between the primary frequency modulation rotation speed inequality rate and the frequency modulation power of the thermal generator set in the embodiment of the invention;
fig. 8 is a schematic flow chart of a primary frequency modulation closed loop processing method based on integrated electric quantity according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of an apparatus for processing a primary FM closed loop based on integrated power according to an embodiment of the present invention;
FIG. 10 is a block diagram of the instruction modification module 30 according to one embodiment of the present invention;
FIG. 11 is a block diagram of the instruction modification module 30 according to the second embodiment of the present invention;
FIG. 12 is a block diagram of the setting value generation module 10 according to the embodiment of the present invention;
fig. 13 is a schematic structural diagram of an electronic device in an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
It should be noted that the terms "comprises" and "comprising," and any variations thereof, in the description and claims of this application and the above-described drawings, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Based on the technical pain point, an embodiment of the present invention provides a specific implementation manner of a primary frequency modulation closed loop processing method based on integrated electric quantity, and referring to fig. 2, the method specifically includes the following contents:
step 100: generating a set value of integral electric quantity according to the first frequency difference function;
first, referring to table 1, a first frequency difference function is shown in table 1, and then, the target power under the conditions of frequency modulation amplification and frequency modulation reduction load are respectively calculated according to the first frequency difference function, and a set value of the integral electric quantity is calculated according to the target power.
TABLE 1
Step 200: calculating actual integral electric quantity in real time according to a second frequency difference function; the first frequency difference function is generated according to network frequency and frequency modulation load; the second frequency difference function is generated according to the network frequency and the correction value of the comprehensive flow instruction;
preferably, referring to table 2, the second frequency difference function is shown in table 2:
TABLE 2
Specifically, the second frequency difference function is used for detecting that the rated network frequency exceeds a dead zone (plus or minus 2 r/min), roughly designing a steam turbine flow instruction feedforward value according to corresponding historical data between the network frequency and the comprehensive flow, and directly acting a steam turbine comprehensive flow execution loop. The method mainly ensures the rapidity of primary frequency modulation action and belongs to feed-forward control.
Step 300: and correcting the power grid dispatching load instruction and the comprehensive flow instruction according to the set value and the actual integral electric quantity.
The integral scheme of the once frequency modulation integral electric quantity closed-loop control of the thermal generator set provided by the invention is shown in figure 3. On the basis of fig. 1, the calculation of actual integral electric quantity and integral electric quantity fixed value is added, and the difference value enters a load instruction loop and a comprehensive flow instruction loop of the original frequency modulation system through a compensation controller 1 and a compensation controller 2 respectively.
Referring to fig. 3, the calculated difference value of the integrated electric quantity (obtained by calculating the difference value between the set value of the integrated electric quantity and the actual integrated electric quantity) is sent to the compensation controller 1, and is calculated by the compensation controller 1 to form a fixed value correction instruction of the frequency modulation load, so as to correct the AGC load instruction.
Then, the calculated difference value of the integral electric quantity is sent to a compensation controller 2, and is calculated by the compensation controller 2 to form a flow correction instruction, and a comprehensive flow instruction is corrected
As can be seen from the foregoing description, an embodiment of the present invention provides a primary frequency modulation closed-loop processing method based on integrated electric quantity, including: firstly, generating a set value of integral electric quantity according to a first frequency difference function; then, calculating actual integral electric quantity in real time according to a second frequency difference function; the first frequency difference function is generated according to the network frequency and the frequency modulation load; the second frequency difference function is generated according to the network frequency and the correction value of the comprehensive flow instruction; and finally, correcting the power grid dispatching load instruction and the comprehensive flow instruction according to the set value and the actual integral electric quantity.
The invention realizes the synchronous millisecond calculation of the primary frequency modulation integral electric quantity and other core indexes on the unit side control system, and introduces the integral electric quantity index as the regulated quantity into the primary frequency modulation real-time closed-loop control, thereby realizing the accurate control of the unit primary frequency modulation integral electric quantity and other indexes and improving the unit primary frequency modulation performance.
In one embodiment, referring to fig. 4, step 300 includes:
step 301: calculating a difference between the set value and the actual integrated electric quantity;
step 302: inputting the difference value into a first compensation controller to generate a frequency modulation load constant value correction instruction;
step 303: and correcting the power grid dispatching load instruction according to the frequency modulation load fixed value correction instruction.
With reference to fig. 3, in steps 301 to 303, the calculated integrated power difference is sent to the first compensation controller, and is calculated by the compensation controller 1 to form a fixed frequency modulation load value correction instruction, so as to correct the AGC load instruction.
The compensation controller calculates the difference of the integral electric quantity and converts the difference into a compensation value of the frequency modulation load instruction, and the frequency modulation load instruction is further corrected in real time. Calculating the formula:
the compensation output 1 frequency modulation power P (MW) is calculated according to the following formula:
in the formula:
i-integrated electrical quantity, MWh;
t is time, h;
k 1-adjustment factor;
in one embodiment, referring to fig. 5, step 300 further comprises:
With reference to fig. 3, in step 301, the calculated integrated electric quantity difference is sent to the second compensation controller, and is calculated by the second compensation controller to form a flow correction command, so as to correct the integrated flow command.
The second compensation controller:
the compensation output 2 is calculated by the following formula according to the comprehensive valve position correction G (%):
in the formula:
i-integrated electrical quantity, MWh;
t is time, h;
k 2-adjustment factor;
in one embodiment, referring to fig. 6, step 100 comprises:
step 101: respectively calculating target power under the condition that the frequency modulation load is increased and decreased according to the turbine rotation speed difference, the primary frequency modulation dead zone, the turbine rated rotation speed, the rated load and the primary frequency modulation rotation speed unequal rate;
step 102: and generating a set value of the integral electric quantity according to the target power.
Specifically, the power command compensation amount P after the primary frequency modulation operation can be calculated by using the formula (1) and the formula (2) respectively during the frequency modulation load increase and load decrease.
When the frequency modulation is used for increasing the load, the target power is calculated according to the following formula:
when the frequency modulation is used for reducing the load, the target power is calculated according to the following formula:
in the formula:
FIG. 7 is a diagram illustrating the primary frequency modulation characteristic of a thermal power generating unit, wherein the primary frequency modulation dead zone is set to be +/-2 r/min, the rotation speed inequality rate is set to be 5%, and the lower limit of the limiting amplitude is 6% -10%P e In between.
In an embodiment, referring to fig. 8, the present invention further provides an embodiment of a method for processing a primary frequency modulation closed loop based on an integrated electric quantity.
S1: generating an integral electric quantity set value according to the frequency difference function 1;
the frequency difference function 1 can be seen in table 1. When the frequency difference function 1 detects that the rated network frequency exceeds the dead zone (plus or minus 2 r/min), the frequency modulation load instruction is calculated according to a rotating speed unequal rate formula and is superposed at an outlet of the network modulation AGC load instruction to jointly form a final unit load instruction. The method mainly ensures the accuracy of primary frequency modulation control, and belongs to closed-loop control.
S2: the real-time calculation of the millisecond-level actual integral electric quantity is realized in an embedded controller of the unit control system;
the method is realized by adopting a unit decentralized control system with high-speed operation capability. Firstly, millisecond-level real-time calculation of integral electric quantity and integral fixed value is needed to be realized, then the original primary frequency modulation control system logic is modified, the integral electric quantity closed-loop control scheme is implemented as shown in figure 3, and finally parameter setting and system debugging are carried out.
S3: calculating the difference value between the set value of the integral electric quantity and the actual integral electric quantity;
s4: sending the integral electric quantity difference calculated in the step S3 into a compensation controller 1, forming a frequency modulation load constant value correction instruction through the operation of the compensation controller 1, and correcting an AGC load instruction;
s5: sending the integral electric quantity difference calculated in the step S3 into a compensation controller 2, forming a flow correction instruction through calculation of the compensation controller 2, and correcting a comprehensive flow instruction;
in step S4 and step S5, a dedicated control device with a high-speed embedded controller is used. Firstly, a network frequency, a unit load, a flow instruction, a load correction instruction, a flow correction instruction and the like required by a primary frequency modulation control system are connected with a special control device in a hard connection or communication mode, the integral operation of the primary frequency modulation of the unit is realized by the special control device, the final load correction instruction and the final flow correction instruction are sent back to the distributed control system, and the whole process control of the primary frequency modulation of the unit is completed by the special device and the distributed control system together.
As can be seen from the foregoing description, an embodiment of the present invention provides a primary frequency modulation closed loop processing method based on integrated electric quantity, including: firstly, generating a set value of integral electric quantity according to a first frequency difference function; then, calculating actual integral electric quantity in real time according to a second frequency difference function; the first frequency difference function is generated according to the network frequency and the frequency modulation load; the second frequency difference function is generated according to the network frequency and the correction value of the comprehensive flow instruction; and finally, correcting the power grid dispatching load instruction and the comprehensive flow instruction according to the set value and the actual integral electric quantity.
On the basis of deeply analyzing the relation between the primary frequency modulation control and the related indexes of the unit, aiming at the problem that the control and the corresponding indexes in the actual operation process of the unit are disjointed, the invention provides an integrated control scheme for changing the related indexes into controlled variables, so as to solve the problem that the primary frequency modulation performance indexes of the thermal power unit cannot meet the requirements of the related indexes. The invention solves the basic common problem of primary frequency modulation grid connection of a thermoelectric generator set in the prior art. The millisecond operation of the integral electric quantity is realized in the unit process controller, and finally the closed-loop control of the integral electric quantity as the controlled quantity is realized, so that the timeliness and the accuracy of the unit primary frequency modulation performance response are improved. To sum up, the comprehensive application of the scheme can greatly improve the integral primary frequency modulation allowance of the power grid, and provide powerful frequency safety guarantee for the construction of a novel power system.
Based on the same inventive concept, the embodiment of the present application further provides a primary frequency modulation closed loop processing apparatus based on integrated electric quantity, which can be used to implement the methods described in the above embodiments, such as the following embodiments. Because the principle of solving the problems of the primary frequency modulation closed-loop processing device based on the integral electric quantity is similar to that of the primary frequency modulation closed-loop processing method based on the integral electric quantity, the implementation of the primary frequency modulation closed-loop processing device based on the integral electric quantity can be referred to the implementation of the primary frequency modulation closed-loop processing method based on the integral electric quantity, and repeated parts are not described again. As used hereinafter, the term "unit" or "module" may be a combination of software and/or hardware that implements a predetermined function. While the system described in the embodiments below is preferably implemented in software, implementations in hardware, or a combination of software and hardware are also possible and contemplated.
An embodiment of the present invention provides a specific implementation manner of a primary frequency modulation closed loop processing apparatus based on integrated electric quantity, which is capable of implementing a primary frequency modulation closed loop processing method based on integrated electric quantity, and referring to fig. 9, the primary frequency modulation closed loop processing apparatus based on integrated electric quantity specifically includes the following contents:
a set value generating module 10, configured to generate a set value of the integral electric quantity according to the first frequency difference function;
the actual integral electric quantity calculating module 20 is used for calculating actual integral electric quantity in real time according to the second frequency difference function; the first frequency difference function is generated according to network frequency and frequency modulation load; the second frequency difference function is generated according to the network frequency and the correction value of the comprehensive flow instruction;
and the instruction correction module 30 is used for correcting the power grid dispatching load instruction and the comprehensive flow instruction according to the set value and the actual integral electric quantity.
In one embodiment, referring to fig. 10, the instruction modification module 30 includes:
a difference calculation unit 301 configured to calculate a difference between the set value and the actual integrated electric quantity;
a constant value correction instruction generating unit 302, configured to input the difference value into the first compensation controller to generate a frequency modulation load constant value correction instruction;
and the coincidence instruction correcting unit 303 is used for correcting the power grid dispatching load instruction according to the frequency modulation load fixed value correcting instruction.
In an embodiment, referring to fig. 11, the instruction modification module 30 further includes:
a flow rate correction instruction generating unit 30a for inputting the difference value into the second compensation controller to generate a flow rate correction instruction;
and a flow instruction correction unit 30b configured to correct the integrated flow instruction according to the flow correction instruction.
In one embodiment, referring to fig. 12, the setting value generating module 10 includes:
the target power calculation unit 101 is used for calculating target power under the condition that the frequency modulation load is increased and decreased respectively according to the turbine rotation speed difference, the primary frequency modulation dead zone, the turbine rated rotation speed, the rated load and the primary frequency modulation rotation speed unequal rate;
a set value generating unit 102, configured to generate a set value of the integrated electric quantity according to the target power.
As can be seen from the foregoing description, an embodiment of the present invention provides a primary frequency modulation closed-loop processing apparatus based on integrated electric quantity, including: firstly, generating a set value of integral electric quantity according to a first frequency difference function; then, calculating actual integral electric quantity in real time according to a second frequency difference function; the first frequency difference function is generated according to the network frequency and the frequency modulation load; the second frequency difference function is generated according to the network frequency and the correction value of the comprehensive flow instruction; and finally, correcting the power grid dispatching load instruction and the comprehensive flow instruction according to the set value and the actual integral electric quantity.
On the basis of deeply analyzing the relation between the primary frequency modulation control and the related indexes of the unit, aiming at the problem that the control and the corresponding indexes are disconnected in the actual operation process of the unit, the invention provides an integrated control scheme for changing the related indexes into controlled variables, so as to solve the problem that the primary frequency modulation performance indexes of the thermal power unit cannot meet the requirements of the related indexes. The invention solves the basic common problem of primary frequency modulation grid connection of a thermoelectric generator set in the prior art. The millisecond-level operation of the integral electric quantity is realized in the unit process controller, and finally the closed-loop control of the integral electric quantity as the controlled quantity is realized, so that the timeliness and the accuracy of the unit primary frequency modulation performance response are improved. To sum up, the comprehensive application of the scheme can greatly improve the integral primary frequency modulation allowance of the power grid, and provide powerful frequency safety guarantee for the construction of a novel power system.
An embodiment of the present application further provides a specific implementation manner of an electronic device, which is capable of implementing all steps in the integrated power-based primary frequency modulation closed-loop processing method in the foregoing embodiment, and referring to fig. 13, the electronic device specifically includes the following contents:
a processor (processor) 1201, a memory (memory) 1202, a communication Interface (Communications Interface) 1203, and a bus 1204;
the processor 1201, the memory 1202 and the communication interface 1203 complete communication with each other through the bus 1204; the communication interface 1203 is used for implementing information transmission between related devices such as server-side devices and client-side devices;
the processor 1201 is configured to call the computer program in the memory 1202, and the processor executes the computer program to implement all the steps in the integrated power-based chirp closed-loop processing method in the above embodiments, for example, the processor executes the computer program to implement the following steps:
step 100: generating a set value of integral electric quantity according to the first frequency difference function;
step 200: calculating actual integral electric quantity in real time according to the second frequency difference function; the first frequency difference function is generated according to network frequency and frequency modulation load; the second frequency difference function is generated according to the network frequency and the correction value of the comprehensive flow instruction;
step 300: and correcting a power grid dispatching load instruction and a comprehensive flow instruction according to the set value and the actual integral electric quantity.
Embodiments of the present application further provide a computer-readable storage medium capable of implementing all steps of the integrated power-based primary frequency modulation closed-loop processing method in the foregoing embodiments, where the computer-readable storage medium stores a computer program, and the computer program implements all steps of the integrated power-based primary frequency modulation closed-loop processing method in the foregoing embodiments when executed by a processor, for example, the processor implements the following steps when executing the computer program:
step 100: generating a set value of integral electric quantity according to the first frequency difference function;
step 200: calculating actual integral electric quantity in real time according to a second frequency difference function; the first frequency difference function is generated according to network frequency and frequency modulation load; the second frequency difference function is generated according to the network frequency and the correction value of the comprehensive flow instruction;
step 300: and correcting a power grid dispatching load instruction and a comprehensive flow instruction according to the set value and the actual integral electric quantity.
All the embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the hardware + program class embodiment, since it is substantially similar to the method embodiment, the description is simple, and the relevant points can be referred to the partial description of the method embodiment.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand the invention for and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
The foregoing description of specific embodiments has been presented for purposes of illustration and description. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.
Although the present application provides method steps as in embodiments or flowcharts, additional or fewer steps may be included based on routine or non-inventive labor. The order of steps recited in the embodiments is merely one manner of performing the steps in a multitude of orders and does not represent the only order of execution. When an actual apparatus or client product executes, it may execute sequentially or in parallel (e.g., in the context of parallel processors or multi-threaded processing) according to the embodiments or methods shown in the figures.
For convenience of description, the above devices are described as being divided into various modules by functions, and are described separately. Of course, in implementing the embodiments of the present description, the functions of each module may be implemented in one or more software and/or hardware, or a module implementing the same function may be implemented by a combination of multiple sub-modules or sub-units, and the like. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one type of logical functional division, and other divisions may be realized in practice, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
Those skilled in the art will also appreciate that, in addition to implementing the controller as pure computer readable program code, the same functionality can be implemented by logically programming method steps such that the controller is in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers and the like. Such a controller may therefore be considered as a hardware component, and the means included therein for performing the various functions may also be considered as a structure within the hardware component. Or even means for performing the functions may be regarded as being both a software module for performing the method and a structure within a hardware component.
In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of a computer-readable medium.
The embodiments of this specification may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. The described embodiments may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage devices.
All the embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment. In the description of the specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments of the specification. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
The above description is only an example of the embodiments of the present disclosure, and is not intended to limit the embodiments of the present disclosure. Various modifications and variations to the embodiments described herein will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present specification should be included in the scope of the claims of the embodiments of the present specification.
Claims (11)
1. A primary frequency modulation closed loop processing method based on integral electric quantity is characterized by comprising the following steps:
generating a set value of integral electric quantity according to the first frequency difference function;
calculating actual integral electric quantity in real time according to a second frequency difference function; the first frequency difference function is generated according to network frequency and frequency modulation load; the second frequency difference function is generated according to the network frequency and the correction value of the comprehensive flow instruction;
and correcting a power grid dispatching load instruction and a comprehensive flow instruction according to the set value and the actual integral electric quantity.
2. A primary frequency modulation closed loop processing method as claimed in claim 1, wherein said modifying the grid dispatching load command according to the set value and the actual integral electric quantity comprises:
calculating a difference between the set value and the actual integrated electric quantity;
inputting the difference value into a first compensation controller to generate a frequency modulation load constant value correction instruction;
and correcting the power grid dispatching load instruction according to the frequency modulation load fixed value correction instruction.
3. A primary frequency modulation closed loop processing method as claimed in claim 2, wherein the step of correcting the integrated flow rate command according to the set value and the actual integrated electric quantity comprises:
inputting the difference value into a second compensation controller to generate a flow correction instruction;
and correcting the comprehensive flow instruction according to the flow correction instruction.
4. A primary frequency modulation closed-loop processing method as claimed in claim 1, wherein said generating a setting value of an integrated electric quantity according to a first frequency difference function comprises:
respectively calculating target power under the condition that the frequency modulation load is increased and decreased according to the rotating speed difference of the steam turbine, the primary frequency modulation dead zone, the rated rotating speed of the steam turbine, the rated load and the primary frequency modulation rotating speed unequal rate;
and generating a set value of the integral electric quantity according to the target power.
5. A primary frequency modulation closed loop processing device based on integral electric quantity is characterized by comprising:
the set value generating module is used for generating a set value of the integral electric quantity according to the first frequency difference function;
the actual integral electric quantity calculating module is used for calculating actual integral electric quantity in real time according to the second frequency difference function; the first frequency difference function is generated according to network frequency and frequency modulation load; the second frequency difference function is generated according to the network frequency and the correction value of the comprehensive flow instruction;
and the instruction correction module is used for correcting the power grid dispatching load instruction and the comprehensive flow instruction according to the set value and the actual integral electric quantity.
6. A primary frequency modulation closed-loop processing apparatus according to claim 5, wherein the instruction modification module comprises:
a difference value calculation unit for calculating a difference value between the set value and the actual integrated electric quantity;
the fixed value correction instruction generating unit is used for inputting the difference value into the first compensation controller so as to generate a frequency modulation load fixed value correction instruction;
and the coincidence instruction correcting unit is used for correcting the power grid dispatching load instruction according to the frequency modulation load fixed value correcting instruction.
7. A primary frequency closed-loop processing apparatus according to claim 6, wherein said instruction modification module further comprises:
a flow correction instruction generating unit, configured to input the difference value into a second compensation controller to generate a flow correction instruction;
and the flow instruction correction unit is used for correcting the comprehensive flow instruction according to the flow correction instruction.
8. A primary frequency modulated closed loop processing apparatus as defined in claim 5, wherein the set point generating module comprises:
the target power calculation unit is used for calculating target power under the condition that the frequency modulation load is increased and decreased respectively according to the rotating speed difference of the steam turbine, the primary frequency modulation dead zone, the rated rotating speed of the steam turbine, the rated load and the primary frequency modulation rotating speed unequal rate;
and the set value generating unit is used for generating the set value of the integral electric quantity according to the target power.
9. A computer program product comprising computer program/instructions, characterized in that the computer program/instructions, when executed by a processor, implement the steps of the integrated power based primary chirp closed loop processing method of any one of claims 1 to 4.
10. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the steps of the integrated power-based chirp-closed-loop processing method according to any one of claims 1 to 4 when executing the program.
11. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the integrated-power-based primary tone closed-loop processing method according to any one of claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211618586.9A CN115622088A (en) | 2022-12-16 | 2022-12-16 | Primary frequency modulation closed-loop processing method and device based on integral electric quantity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211618586.9A CN115622088A (en) | 2022-12-16 | 2022-12-16 | Primary frequency modulation closed-loop processing method and device based on integral electric quantity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115622088A true CN115622088A (en) | 2023-01-17 |
Family
ID=84879724
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211618586.9A Pending CN115622088A (en) | 2022-12-16 | 2022-12-16 | Primary frequency modulation closed-loop processing method and device based on integral electric quantity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115622088A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109638879A (en) * | 2018-12-14 | 2019-04-16 | 国网山东省电力公司电力科学研究院 | Primary frequency modulation dynamic compensation adjustment system and method based on performance indicator assessment |
| CN112531769A (en) * | 2020-11-20 | 2021-03-19 | 华能国际电力股份有限公司汕头电厂 | Primary frequency modulation control method for thermal power plant |
| CN112865134A (en) * | 2021-01-04 | 2021-05-28 | 神华神东电力有限责任公司 | Power grid frequency primary frequency modulation control system |
| US20210218247A1 (en) * | 2019-03-13 | 2021-07-15 | Xi'an Jiaotong University | Optimized control method for primary frequency regulation based on exergy storage correction of thermodynamic system of coal-fired unit |
| CN114928119A (en) * | 2022-06-16 | 2022-08-19 | 吉林省电力科学研究院有限公司 | Primary frequency modulation control method considering dynamic frequency modulation amplitude and integral electric quantity of power grid |
-
2022
- 2022-12-16 CN CN202211618586.9A patent/CN115622088A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109638879A (en) * | 2018-12-14 | 2019-04-16 | 国网山东省电力公司电力科学研究院 | Primary frequency modulation dynamic compensation adjustment system and method based on performance indicator assessment |
| US20210218247A1 (en) * | 2019-03-13 | 2021-07-15 | Xi'an Jiaotong University | Optimized control method for primary frequency regulation based on exergy storage correction of thermodynamic system of coal-fired unit |
| CN112531769A (en) * | 2020-11-20 | 2021-03-19 | 华能国际电力股份有限公司汕头电厂 | Primary frequency modulation control method for thermal power plant |
| CN112865134A (en) * | 2021-01-04 | 2021-05-28 | 神华神东电力有限责任公司 | Power grid frequency primary frequency modulation control system |
| CN114928119A (en) * | 2022-06-16 | 2022-08-19 | 吉林省电力科学研究院有限公司 | Primary frequency modulation control method considering dynamic frequency modulation amplitude and integral electric quantity of power grid |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Rafiee et al. | Robust load-frequency control in islanded microgrids: Virtual synchronous generator concept and quantitative feedback theory | |
| Lei et al. | Optimization and coordination of damping controls for improving system dynamic performance | |
| Capitanescu et al. | A new iterative approach to the corrective security-constrained optimal power flow problem | |
| Glavic et al. | Receding-horizon multi-step optimization to correct nonviable or unstable transmission voltages | |
| Yazdi et al. | Analytical modeling and inertia estimation of VSG-controlled Type 4 WTGs: Power system frequency response investigation | |
| CN109447379B (en) | Step-by-step optimization method and system for safety correction of medium-and-long-term electric quantity | |
| Jiang et al. | Storage-based frequency shaping control | |
| Park et al. | Model-free control for frequency response support in microgrids utilizing wind turbines | |
| Hongesombut et al. | Fractional order based on a flower pollination algorithm PID controller and virtual inertia control for microgrid frequency stabilization | |
| Attya et al. | Novel concept of renewables association with synchronous generation for enhancing the provision of ancillary services | |
| Chang-Chien et al. | Estimation of/spl beta/for adaptive frequency bias setting in load frequency control | |
| Long et al. | Frequency stability enhancement of an islanded microgrid: A fractional-order virtual synchronous generator | |
| Xiong et al. | Event triggered prescribed time convergence sliding mode control of DFIG with disturbance rejection capability | |
| Almada et al. | Microgrid distributed secondary control and energy management using multi‐agent system | |
| Swain et al. | Stabilized frequency response of a microgrid using a two-degree-of-freedom controller with African vultures optimization algorithm | |
| Aziz et al. | Participation of DFIG based wind energy system in load frequency control of interconnected multigeneration power system | |
| Elliott et al. | Real power modulation strategies for transient stability control | |
| CN104240151A (en) | Transient stability optimal correcting and control system and method for power system | |
| CN115622088A (en) | Primary frequency modulation closed-loop processing method and device based on integral electric quantity | |
| CN110867893A (en) | Primary frequency modulation control method and device of combined cycle unit | |
| Riquelme et al. | RoCoF-Minimizing H₂ Norm Control Strategy for Multi-Wind Turbine Synthetic Inertia | |
| Riquelme et al. | A review of limitations of wind synthetic inertia methods | |
| CN110374789A (en) | A kind of water turbine set governor pid parameter switching method and device | |
| Ganesan et al. | Coordinated control of rotor side converter and grid side converter on 15 kW DFIG using cascaded feedback linearization controllers | |
| Bhowmik et al. | Experimental prototyping of synthetic inertial system for the improvement in frequency deflection |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20230117 |
|
| RJ01 | Rejection of invention patent application after publication |