CN111864744B - Online switching method and system for control modes of speed regulator of high-proportion hydroelectric system - Google Patents
Online switching method and system for control modes of speed regulator of high-proportion hydroelectric system Download PDFInfo
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- CN111864744B CN111864744B CN202010756934.3A CN202010756934A CN111864744B CN 111864744 B CN111864744 B CN 111864744B CN 202010756934 A CN202010756934 A CN 202010756934A CN 111864744 B CN111864744 B CN 111864744B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/002—Flicker reduction, e.g. compensation of flicker introduced by non-linear load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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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]
Abstract
The invention discloses a method and a system for on-line switching of control modes of a speed regulator of a high-proportion hydroelectric system, which are used for acquiring the current operation mode of the system, the load prediction level, the starting plan and the delivery arrangement in a period of time after the current time, and multiple control modes and corresponding parameters of the speed regulator; determining a bad operation mode within a period of time after the current time according to the current operation mode of the system and the load prediction level, the starting-up plan and the delivery arrangement within a period of time after the current time; sequentially calculating the lowest ultralow frequency oscillation damping of each fault in a severe operation mode after the speed regulator is configured with different control mode parameters; and the control module is used for judging which control mode is selected according to the damping calculated by the calculation module and outputting the result to switch the control modes of the transmission. The invention improves the frequency modulation capability of the system.
Description
Technical Field
The invention relates to the technical field of safety and stability control of an electric power system, in particular to a method, a system, equipment and a medium for online switching of control modes of a speed regulator of a high-proportion hydroelectric system.
Background
In recent years, many ultra-low frequency oscillation accidents occur continuously in a high-proportion hydroelectric system, periodic frequent actions of a speed regulating system are caused, and large-amplitude low-frequency oscillation occurs in system frequency, power and the like, so that the safe and stable operation of a power grid is seriously threatened. In order to prevent the occurrence of ultra-low frequency oscillation, the damping level of the speed regulator in an ultra-low frequency band is usually improved in a mode of optimizing PID parameters of the speed regulator in engineering, but the optimized PID parameters are generally low in response speed of primary frequency modulation, and when a system is disturbed by unbalanced power, the recovery speed of the system frequency is low, so that the contradiction occurs between the ultra-low frequency oscillation suppression and the frequency modulation capability of the system. In fact, to suppress the ultra-low frequency oscillation, the governor parameters are usually optimized in a severe operating mode, such as a heavy water period, a low power grid load level, a maximum hydroelectric power output, a minimum thermal power start-up, without considering direct current FC, and the like. When the scale of a power grid is increased, the load level is high, the thermal power starting is large, and the adjustable capacity of the direct current FC is large, the system damping is strong, which means that the requirement on the damping of a speed regulating system can be properly relaxed, and the frequency modulation capability of the system is mainly considered.
Disclosure of Invention
The invention provides an online switching method for a control mode of a speed regulator of a high-proportion hydroelectric system, aiming at filling the blank that the online switching is not carried out aiming at the control mode of the speed regulator of the high-proportion hydroelectric system at present. The invention provides a means for flexibly adjusting the control strategy of the high-proportion hydroelectric system aiming at different power grid scales and operation modes.
The invention is realized by the following technical scheme:
the method for switching the control modes of the speed regulator of the high-proportion hydroelectric system on line comprises the following steps:
step S1, acquiring the current operation mode of the system, and determining the severe operation mode within a period of time after the current time by combining the load prediction level, the starting plan and the delivery arrangement within a period of time after the current time;
step S2, the speed governor parameter corresponding to the speed governor control mode i is configured to the corresponding machine set in the bad operation mode, the bad operation mode is scanned, and the lowest ultralow frequency oscillation damping d under various faults is obtainediAs the damping corresponding to the governor mode i, the initial value of i is 1;
step S3, if di≥d0Then go to step S4; if d isi＜d0If so, let i equal to i +1, and return to step S2; wherein d is0Representing a preset damping index;
and step S4, switching the current control mode of the speed regulator to the control mode i.
Optionally, the speed regulator control modes of the present invention include n control modes, where n is a positive integer greater than or equal to 3 and i is not greater than n, the n control modes are sequentially arranged in an ascending order according to the ultra-low frequency oscillation damping level, the mode 1 is a large grid mode, the mode n is an isolated grid mode, and the mode j (j is 2, …, n-1) is an optimization mode.
Optionally, the obtaining mode of the optimization mode of the invention is as follows: and (3) according to the speed regulator optimization schemes determined by different power grid operation modes, optimizing speed regulator parameters for each optimization scheme, determining the speed regulator optimization range and each optimized hydroelectric generating set speed regulator parameter, and configuring the speed regulator optimization parameter corresponding to the operation mode j obtained through optimization into an optimization mode j.
Optionally, in step S2 of the present invention, the lowest ultralow frequency oscillation damping under various faults is obtained by analysis using the Prony method.
On the other hand, the invention also provides an online switching system for the control mode of the speed regulator of the high-proportion hydroelectric system, which comprises an input module, a calculation module and an output module; wherein the content of the first and second substances,
the input module is used for obtaining: the system comprises a current operation mode, a load prediction level, a starting-up plan and a delivery arrangement in a period of time after the current time, a speed regulator multi-control mode and corresponding parameters; determining a bad operation mode within a period of time after the current time according to the current operation mode of the system and the load prediction level, the starting-up plan and the delivery arrangement within a period of time after the current time;
the calculation module is used for sequentially calculating the lowest ultralow frequency oscillation damping of each fault in a severe operation mode after the speed regulator is configured with different control mode parameters;
and the output module is used for judging which control mode is selected according to the damping calculated by the calculation module and outputting the result to switch the control modes of the transmission.
Optionally, the multiple control modes of the speed regulator of the invention include n control modes, where n is a positive integer greater than or equal to 3, the n control modes are sequentially arranged in an ascending order according to the ultralow frequency oscillation damping level, mode 1 is a large grid mode, mode n is an isolated grid mode, and mode j (j is 2, …, n-1) is an optimization mode.
Optionally, the obtaining mode of the optimization mode of the invention is as follows: and (3) according to the speed regulator optimization schemes determined by different power grid operation modes, optimizing speed regulator parameters for each optimization scheme, determining the speed regulator optimization range and each optimized hydroelectric generating set speed regulator parameter, and configuring the speed regulator optimization parameter corresponding to the operation mode j obtained through optimization into an optimization mode j.
Optionally, the calculation module of the present invention analyzes by using a Prony method to obtain the lowest ultralow frequency oscillation damping under various faults.
The invention also proposes a computer device comprising a memory and a processor, the memory storing a computer program, the processor implementing the steps of the above method when executing the computer program.
The invention also proposes 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 above-mentioned method.
The invention has the following advantages and beneficial effects:
the speed regulator control mode on-line switching technology of the high-proportion hydroelectric system can flexibly switch the speed regulator control mode according to the actual condition of a power grid, and when the ultralow frequency oscillation of the system is prominent, the inhibition of the ultralow frequency oscillation is preferentially considered; when the ultra-low frequency oscillation risk of the system is low, the parameters of the speed regulator are properly adjusted, and the frequency modulation capability of the system is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic flow chart of the method of the present invention.
FIG. 2 is a schematic flow chart of the system of the present invention.
FIG. 3 is a functional block diagram of the computer apparatus of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
The embodiment provides an online switching method for a control mode of a speed regulator of a high-proportion hydroelectric system.
As shown in fig. 1, the handover method of the present embodiment includes the following steps:
step S1, acquiring the current operation mode of the system, and determining the severe operation mode within a period of time after the current time by combining the load prediction level, the starting plan and the delivery arrangement within a period of time after the current time;
step S2, the speed governor parameter corresponding to the speed governor control mode i is configured to the corresponding machine set in the bad operation mode, the bad operation mode is scanned, and the lowest ultralow frequency oscillation damping d under various faults is obtainediAs the damping corresponding to the governor mode i, the initial value of i is 1;
step S3, if di≥d0Then go to step S4; if d isi＜d0If so, let i equal to i +1, and return to step S2; wherein d is0Representing a preset damping index;
and step S4, switching the current control mode of the speed regulator to the control mode i.
Step S1 of this embodiment further obtains a multiple control mode of the speed governor and corresponding parameters thereof, where the multiple control mode of the speed governor includes n control modes, where n is a positive integer greater than or equal to 3, and the control modes are sequentially arranged from low to high according to the ultralow frequency oscillation damping level, where mode 1 is generally a large network mode, and the frequency modulation performance is the best, and the speed governor meets the requirement of primary frequency modulation performance assessment; the mode n is an isolated network mode, the damping level is highest, and the stability of isolated operation of the unit is met; the mode j (j is 2 … n-1) is a speed regulator optimization scheme determined according to different power grid operation modes, and for each optimization scheme, the prior patent number ZL201811326765.9 of the applicant is adopted, and the patent name is as follows: a speed regulator parameter adjusting scheme and system after asynchronous interconnection of a water and electricity serving as a main power grid are disclosed, the patent technology with application date of 20181108 is used for optimizing speed regulator parameters, and the optimization range of the speed regulators and the speed regulator parameters of each optimized hydroelectric generating set are determined. And (4) configuring the governor optimization parameters corresponding to the optimized operation mode j into an optimization mode j.
Step S1 of the present embodiment derives the current mode of operation of the high proportion hydro-electric system by means of a dispatch control system, such as a D5000 system.
In step S2 of this embodiment, the lowest ultralow frequency oscillation damping i under each fault is analyzed by, but not limited to, the Prony method.
The method of the embodiment is implemented in the current operation mode, and when the operation mode is changed greatly, if the minimum load is lower than the minimum load calculated before, the thermal power start is lower than the start calculated before, the hydroelectric power start is increased, and the like, the check needs to be recalculated, and the adaptability of the control mode of the speed regulator is confirmed.
As shown in fig. 3, the computer device includes a processor, a memory, and a system bus; various device components including a memory and a processor are connected to the system bus. A processor is hardware used to execute computer program instructions through basic arithmetic and logical operations in a computer system. Memory is a physical device used for temporarily or permanently storing computing programs or data (e.g., program state information). The system bus may be any of several types of bus structures including a memory bus or memory controller, a peripheral bus, and a local bus. The processor and the memory may be in data communication via a system bus. Including read-only memory (ROM) or flash memory (not shown), and Random Access Memory (RAM), which typically refers to main memory loaded with an operating system and computer programs.
Computer devices typically include a storage device. The storage device may be selected from a variety of computer readable media, which refers to any available media that can be accessed by a computer device, including both removable and non-removable media. For example, computer-readable media includes, but is not limited to, flash memory (micro SD cards), CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer device.
A computer device may be logically connected in a network environment to one or more network terminals. The network terminal may be a personal computer, a server, a router, a smart phone, a tablet, or other common network node. The computer apparatus is connected to the network terminal through a network interface (local area network LAN interface). A Local Area Network (LAN) refers to a computer network formed by interconnecting within a limited area, such as a home, a school, a computer lab, or an office building using a network medium. WiFi and twisted pair wiring ethernet are the two most commonly used technologies to build local area networks.
It should be noted that other computer systems including more or less subsystems than computer devices can also be suitable for use with the invention.
As described in detail above, the computer apparatus suitable for use in the present invention is capable of performing the designated operations of the high-proportion hydro-electric system governor control mode on-line switching method. The computer device performs these operations in the form of software instructions executed by a processor in a computer-readable medium. These software instructions may be read into memory from a storage device or from another device via a local area network interface. The software instructions stored in the memory cause the processor to perform the method of processing group membership information described above. Furthermore, the present invention can be implemented by hardware circuits or by a combination of hardware circuits and software instructions. Thus, implementations of the invention are not limited to any specific combination of hardware circuitry and software.
Example 2
The embodiment provides an online switching system for a speed regulator control mode of a high-proportion hydroelectric system.
As shown in fig. 2, the system of the present embodiment includes an input module, a calculation module, and an output module. Wherein the content of the first and second substances,
the input module is used for obtaining: the system comprises a current operation mode, a load prediction level, a starting-up plan and a delivery arrangement in a period of time after the current time, a speed regulator multi-control mode and corresponding parameters; determining a bad operation mode within a period of time after the current time according to the current operation mode of the system and the load prediction level, the starting-up plan and the delivery arrangement within a period of time after the current time;
the calculation module is used for calculating the lowest ultralow frequency oscillation damping under each fault in the severe operation mode after the speed regulator is configured with different control mode parameters in sequence, specifically, configuring the speed regulator parameter corresponding to the speed regulator control mode i to a corresponding unit in the severe operation mode, scanning the severe operation mode, and obtaining the lowest ultralow frequency oscillation damping d under each faultiAs the damping corresponding to governor mode i;
the output module is used for judging which control mode is selected according to the damping calculated by the calculation module, and outputting the result to switch the control modes of the transmission, and specifically comprises the following steps: if d isi≥d0If yes, switching the current control mode of the speed regulator into a control mode i; if d isi＜d0If the speed regulator control mode i is set to be i +1, executing the steps of configuring the speed regulator parameters corresponding to the speed regulator control mode i to the corresponding unit in the severe operation mode, scanning the severe operation mode and obtaining the lowest ultralow frequency oscillation damping d under various faultsiDamping corresponding to the governor mode i; wherein d is0Indicating a preset damping index, i has an initial value of 1.
The multi-control mode of the speed regulator comprises n control modes, wherein n is a positive integer larger than or equal to 3, the control modes are sequentially arranged from low to high according to the ultralow frequency oscillation damping level, the mode 1 is generally a large network mode, the frequency modulation performance is best, and the speed regulator meets the primary frequency modulation performance assessment requirement; the mode n is an isolated network mode, the damping level is highest, and the stability of isolated operation of the unit is met; the mode j (j is 2 … n-1) is a speed regulator optimization scheme determined according to different power grid operation modes, and for each optimization scheme, the prior patent number ZL201811326765.9 of the applicant is adopted, and the patent name is as follows: a speed regulator parameter adjusting scheme and system after asynchronous interconnection of a water and electricity serving as a main power grid are disclosed, the patent technology with application date of 20181108 is used for optimizing speed regulator parameters, and the optimization range of the speed regulators and the speed regulator parameters of each optimized hydroelectric generating set are determined. And (4) configuring the governor optimization parameters corresponding to the optimized operation mode j into an optimization mode j.
The input module of the present embodiment obtains the current operation mode of the high-proportion hydroelectric system through a dispatch control system, such as a D5000 system.
The calculation module of this embodiment adopts the analysis of Prony's method to obtain the lowest ultralow frequency oscillation damping under various faults.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application 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.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. The method for switching the control modes of the speed regulator of the high-proportion hydroelectric system on line is characterized by comprising the following steps of:
step S1, acquiring the current operation mode of the system, and determining the severe operation mode within a period of time after the current time by combining the load prediction level, the starting plan and the delivery arrangement within a period of time after the current time;
step S2, the speed governor parameter corresponding to the speed governor control mode i is configured to the corresponding machine set in the bad operation mode, the bad operation mode is scanned, and the lowest ultralow frequency oscillation damping d under various faults is obtainediAs damping for governor mode i, iThe initial value is 1;
step S3, if di≥d0Then go to step S4; if d isi＜d0If so, let i equal to i +1, and return to step S2; wherein d is0Representing a preset damping index;
step S4, switching the current control mode of the speed regulator into a control mode i; the speed regulator control modes comprise n control modes, wherein n is a positive integer larger than or equal to 3, i is smaller than or equal to n, the n control modes are sequentially arranged in an ascending order according to the ultralow frequency oscillation damping level, the mode 1 is a large-network mode, the mode n is an isolated-network mode, the mode j is an optimization mode, and j is 2, … or n-1; the optimization mode obtaining mode is as follows: and (3) according to the speed regulator optimization schemes determined by different power grid operation modes, optimizing speed regulator parameters for each optimization scheme, determining the speed regulator optimization range and each optimized hydroelectric generating set speed regulator parameter, and configuring the speed regulator optimization parameter corresponding to the operation mode j obtained through optimization into an optimization mode j.
2. The high-proportion hydroelectric system speed regulator control mode online switching method according to claim 1, wherein the step S2 adopts a Prony method to analyze and obtain the lowest ultralow frequency oscillation damping under various faults.
3. The high-proportion hydroelectric system speed regulator control mode online switching system is characterized by comprising an input module, a calculation module and an output module; wherein the content of the first and second substances,
the input module is used for obtaining: the system comprises a current operation mode, a load prediction level, a starting-up plan and a delivery arrangement in a period of time after the current time, a speed regulator multi-control mode and corresponding parameters; determining a bad operation mode within a period of time after the current time according to the current operation mode of the system and the load prediction level, the starting-up plan and the delivery arrangement within a period of time after the current time;
the calculation module is used for sequentially calculating the lowest ultralow frequency oscillation damping of each fault in a severe operation mode after the speed regulator is configured with different control mode parameters;
the output module is used for judging which control mode is selected according to the damping calculated by the calculation module and outputting the result to switch the control modes of the transmission; the multi-control mode of the speed regulator comprises n control modes, wherein n is a positive integer larger than or equal to 3, the n control modes are sequentially arranged in an ascending order according to the ultralow frequency oscillation damping level, the mode 1 is a large-network mode, the mode n is an isolated-network mode, the mode j is an optimization mode, and j is 2, … or n-1; the optimization mode obtaining mode is as follows: and (3) according to the speed regulator optimization schemes determined by different power grid operation modes, optimizing speed regulator parameters for each optimization scheme, determining the speed regulator optimization range and each optimized hydroelectric generating set speed regulator parameter, and configuring the speed regulator optimization parameter corresponding to the operation mode j obtained through optimization into an optimization mode j.
4. The high-proportion hydroelectric system speed regulator control mode online switching system of claim 3, wherein the calculation module analyzes the lowest ultralow frequency oscillation damping under various faults by using a Prony method.
5. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor realizes the steps of the method of any of claims 1-2 when executing the computer program.
6. 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 method according to any one of claims 1-2.
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| CN116632864B (en) * | 2023-05-31 | 2024-04-19 | 东北电力大学 | Ultra-low frequency oscillation control method based on parameter switching of speed regulator under environmental excitation |
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