CN110875599A - Control method and system for power grid frequency oscillation - Google Patents
Control method and system for power grid frequency oscillation Download PDFInfo
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- CN110875599A CN110875599A CN201911067454.XA CN201911067454A CN110875599A CN 110875599 A CN110875599 A CN 110875599A CN 201911067454 A CN201911067454 A CN 201911067454A CN 110875599 A CN110875599 A CN 110875599A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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Abstract
The invention relates to a control method and a control system for power grid frequency oscillation, and belongs to the technical field of power system analysis and control. The method comprises the steps of solving the frequency oscillation mode of the power grid to obtain the oscillation frequency
Damping ratio of
(ii) a If the damping ratio is lower than the set threshold value, calculating the oscillation frequency
Damping torque coefficient of each generator prime mover system
(ii) a According to the magnitude of the damping torque coefficient, adjusting each hairAnd the motor outputs force, so that the damping ratio of the frequency oscillation mode is improved to reach a set threshold value. The invention can effectively improve the damping ratio of the frequency oscillation mode, thereby preventing the frequency oscillation accident of the power grid.
Description
Technical Field
The invention belongs to the technical field of analysis and control of power systems, and particularly relates to a control method and system for power grid frequency oscillation.
Background
In recent years, many ultralow frequency oscillation events with oscillation frequency lower than that of the traditional low frequency oscillation occur in China, and through a great deal of research, the oscillation is the problem of small disturbance stability of a power system in the process of primary frequency modulation, and is the frequency oscillation which is the frequency-coherent oscillation of the whole system frequency. The existing method for inhibiting frequency oscillation mostly focuses on the optimization of the parameters of the speed regulator of the original system, but when the system has a frequency oscillation mode with lower damping, the parameters of the original system cannot be adjusted immediately. The frequency oscillation is the oscillation problem in the active frequency control process of the system, and the output scheme of the generator has great influence on the frequency oscillation. Therefore, how to overcome the defects of the prior art is a problem to be solved in the technical field of power system analysis and control.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides a control method and a control system for power grid frequency oscillation, and the method can effectively improve the damping ratio of a frequency oscillation mode so as to prevent the power grid from frequency oscillation accidents.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a control method for power grid frequency oscillation comprises the following steps:
solving the frequency oscillation mode of the power grid to obtain the oscillation frequency fdA damping ratio ζ;
if the damping ratio is lower than the set threshold value, calculating the oscillation frequency fdDamping torque coefficient K of each generator prime system;
and adjusting the output of each generator according to the damping torque coefficient, so that the damping ratio of the frequency oscillation mode is improved to reach a set threshold value.
Further, preferably, the method for calculating the damping torque coefficient K of the generator prime mover system comprises:
obtaining a transfer function model G(s) of the prime system, wherein the input of the model is negative generator rotation speed deviation-delta omega, and the output is mechanical power deviation delta PmI.e. by
J2 pi fdIn G(s), s is a laplacian, and its real part is a damping torque coefficient, i.e., K ═ Re (G (j2 π f)d))。
Further, preferably, the prime mover system includes a speed governor and a prime mover.
The original method for adjusting the output of each generator is as follows:
the damping torque coefficients of the generators are sequenced from small to large, the output force is adjusted from the generator with the minimum damping coefficient and the generator with the maximum damping coefficient, the output force is reduced by the generator with the small damping torque coefficient, the output force is increased by the generator with the large damping coefficient in an equivalent manner, and the frequency oscillation mode is recalculated until the damping ratio reaches the set threshold value.
In the original adjusting process, the output of the generator is ensured to be within the output upper and lower limit ranges, and the network transmission power is ensured to be within the line transmission limit.
The invention also provides a control system for the frequency oscillation of the power grid, which comprises the following components:
a first processing module for solving the frequency oscillation mode of the power grid to obtain an oscillation frequency fdA damping ratio ζ;
a second processing module for calculating the oscillation frequency f if the damping ratio is lower than a set thresholddDamping torque coefficient K of each generator prime system;
and the damping ratio adjusting module adjusts the output of each generator according to the damping torque coefficient, so that the damping ratio of the frequency oscillation mode is improved and reaches a set threshold value.
The invention also provides an electronic device, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the program to realize the steps of the control method of the power grid frequency oscillation.
The invention further provides a non-transitory computer-readable storage medium, on which a computer program is stored, characterized in that the computer program, when executed by a processor, implements the steps of the above-described method for controlling a grid frequency oscillation.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a control method and a control system for power grid frequency oscillation, when a frequency oscillation mode with weak damping or even negative damping occurs in a power system, the damping ratio of the frequency oscillation mode can be effectively improved by the method, so that frequency oscillation accidents of a power grid are prevented. The method can inhibit the frequency oscillation of weak damping or negative damping in time by adjusting the power of the generator when the power grid normally operates, and effectively reduces the risk of the frequency oscillation of the power grid.
Drawings
Fig. 1 is a flow chart of a method of controlling grid frequency oscillation according to the present invention.
Fig. 2 is a schematic structural diagram of a control system for grid frequency oscillation according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples.
It will be appreciated by those skilled in the art that the following examples are illustrative of the invention only and should not be taken as limiting the scope of the invention. The examples do not specify particular techniques or conditions, and are performed according to the techniques or conditions described in the literature in the art or according to the product specifications. The materials or equipment used are not indicated by manufacturers, and all are conventional products available by purchase.
The damping ratio of the power grid frequency oscillation mode is closely related to the output scheme of the generator in the system, and when the frequency oscillation mode has weak damping or even negative damping, the damping of the frequency oscillation mode can be improved by reasonably adjusting the output of the generator. The invention provides a control method of power grid frequency oscillation, which comprises the following steps:
a: solving the frequency oscillation mode of the power grid to obtain the oscillation frequency fdDamping ratio ζ, if the damping ratio is below a set threshold (e.g.: damping ratio<0.05), the following control is performed.
The general method for solving the frequency oscillation mode is a characteristic value analysis method, and is a mature method in the stability analysis of the power system. Firstly, constructing a dynamic model of an electric power system comprising a speed regulator and a prime mover, then solving a balance point and a state matrix at the balance point, calculating a characteristic value of the state matrix, and screening out a characteristic value lambda (sigma +/-j omega) corresponding to a frequency oscillation modedFrequency of oscillation
Damping ratio
B: calculating the frequency of oscillation fdAnd the damping torque coefficient K of the prime mover system of each generator.
The calculation method is as follows:
B1) obtaining a transfer function model G(s) of a prime mover system (comprising a speed regulator and a prime mover), wherein the input of the model is negative generator speed deviation-delta omega, and the output of the model is mechanical power deviation delta PmI.e. by
B2) J2 pi fdG(s) is introduced, and the real part is the damping torque coefficient, i.e., K — Re (G (j2 pi f)d))。
C: and adjusting the output of the generator according to the damping torque coefficient, and improving the damping ratio of the frequency oscillation mode.
The specific method comprises the following steps:
C1) the damping torque coefficients of the generators are sequenced from small to large, the output of the generators with the minimum damping coefficient and the maximum damping coefficient is adjusted according to the following method, and in the adjusting process, the output of the generators is ensured to be within the output upper and lower limit ranges, and the network transmission power is ensured to be within the line transmission limit.
C2) And the generator with small damping torque coefficient reduces output force, the generator with large damping coefficient equivalently increases output force, and the frequency oscillation mode is recalculated until the damping ratio meets the requirement and reaches the set threshold value.
In specific implementation, according to a certain step length PCThe output of the generator with small damping torque coefficient is reduced by P by changing the outputCThe generator output increase P with large damping torque coefficientCAnd recalculating the frequency oscillation mode, and continuously adjusting the output until the damping ratio meets the requirement.
Fig. 2 is a schematic structural diagram of a control system for grid frequency oscillation according to an embodiment of the present invention, and as shown in fig. 2, an embodiment of the present invention provides a control system for grid frequency oscillation, including: a first processing module 101, configured to solve a frequency oscillation mode of a power grid to obtain an oscillation frequency fdA damping ratio ζ; a second processing module 102 for calculating the oscillation frequency f if the damping ratio is lower than a set thresholddDamping torque coefficient K of each generator prime system; and the damping ratio adjusting module 103 is used for adjusting the output of each generator according to the damping torque coefficient, so that the damping ratio of the frequency oscillation mode is improved and reaches a set threshold value.
In the embodiment of the present invention, the first processing module 101 solves the frequency oscillation mode of the power grid to obtain the oscillation frequency fdA damping ratio ζ; then, the second processing module 102 determines whether the damping ratio reaches a set threshold, and if the damping ratio is lower than the set threshold, calculates the oscillation frequency fdDamping torque coefficient K of each generator prime system; then, the damping ratio adjusting module 103 adjusts the output of each generator according to the damping torque coefficient, so as to increase the damping ratio of the frequency oscillation mode to reach a set threshold.
The control system for the frequency oscillation of the power grid provided by the embodiment of the invention can effectively improve the damping ratio of the frequency oscillation mode, thereby preventing the frequency oscillation accident of the power grid.
The system provided by the embodiment of the present invention is used for executing the above method embodiments, and for details of the process and the details, reference is made to the above embodiments, which are not described herein again.
FIG. 3 is a structural diagram of an electronic device according to an embodiment of the present inventionIt is intended, referring to fig. 3, that the electronic device may include: a processor (processor)301, a communication Interface (communication Interface)302, a memory (memory)303 and a communication bus 304, wherein the processor 301, the communication Interface 302 and the memory 303 complete communication with each other through the communication bus 304. Processor 301 may call logic instructions in memory 303 to perform the following method: solving the frequency oscillation mode of the power grid to obtain the oscillation frequency fdA damping ratio ζ; if the damping ratio is lower than the set threshold value, calculating the oscillation frequency fdDamping torque coefficient K of each generator prime system; and adjusting the output of each generator according to the damping torque coefficient, so that the damping ratio of the frequency oscillation mode is improved to reach a set threshold value, and the control of the frequency oscillation of the power grid is realized.
In addition, the logic instructions in the memory 303 may be implemented in the form of software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In another aspect, an embodiment of the present invention further provides a non-transitory computer-readable storage medium, on which a computer program is stored, where the computer program is implemented to, when executed by a processor, perform the method for controlling grid frequency oscillation provided in the foregoing embodiments, for example, including: solving the frequency oscillation mode of the power grid to obtain the oscillation frequency fdA damping ratio ζ; if the damping ratio is lower than the set threshold value, calculating the oscillation frequency fdAt the position of the air compressor, the air compressor is started,damping torque coefficient K of each generator prime system; and adjusting the output of each generator according to the damping torque coefficient, so that the damping ratio of the frequency oscillation mode is improved to reach a set threshold value.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. A control method for power grid frequency oscillation is characterized by comprising the following steps:
solving the frequency oscillation mode of the power grid to obtain the oscillation frequency fdA damping ratio ζ;
if the damping ratio is lower than the set threshold value, calculating the oscillation frequency fdDamping torque coefficient K of each generator prime system;
and adjusting the output of each generator according to the damping torque coefficient, so that the damping ratio of the frequency oscillation mode is improved to reach a set threshold value.
2. The method for controlling the grid frequency oscillation according to claim 1, wherein the damping torque coefficient K of the generator prime mover system is calculated by:
obtaining a transfer function model G(s) of the prime system, wherein the input of the model is negative generator rotation speed deviation-delta omega, and the output is mechanical power deviation delta PmI.e. by
J2 pi fdIn G(s), s is a laplacian, and its real part is a damping torque coefficient, i.e., K ═ Re (G (j2 π f)d))。
3. A method of controlling oscillation of a frequency of a power grid as claimed in claim 2, wherein the prime mover system comprises a speed governor and a prime mover.
4. The method of controlling grid frequency oscillation according to claim 1, wherein the method of adjusting the output of each generator is:
the damping torque coefficients of the generators are sequenced from small to large, the output force is adjusted from the generator with the minimum damping coefficient and the generator with the maximum damping coefficient, the output force is reduced by the generator with the small damping torque coefficient, the output force is increased by the generator with the large damping coefficient in an equivalent manner, and the frequency oscillation mode is recalculated until the damping ratio reaches the set threshold value.
5. A method for controlling grid frequency oscillation according to claim 4, wherein during regulation the generator output is within its upper and lower output limits and the network transmission power is within line transmission limits.
6. A control system for grid frequency oscillation, comprising:
a first processing module for solving the frequency oscillation mode of the power grid to obtain an oscillation frequency fdA damping ratio ζ;
a second processing module for calculating the oscillation frequency f if the damping ratio is lower than a set thresholddDamping torque coefficient K of each generator prime system;
and the damping ratio adjusting module is used for adjusting the output of each generator according to the damping torque coefficient, so that the damping ratio of the frequency oscillation mode is improved and reaches a set threshold value.
7. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor, when executing the program, carries out the steps of the method for controlling oscillation of the grid frequency according to any of claims 1 to 5.
8. A non-transitory 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 for controlling oscillation of a grid frequency according to any one of claims 1 to 5.
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| CN111864744A (en) * | 2020-07-31 | 2020-10-30 | 国网四川省电力公司电力科学研究院 | Online switching method and system for control modes of speed regulator of high-proportion hydroelectric system |
| CN112186777A (en) * | 2020-09-03 | 2021-01-05 | 中国南方电网有限责任公司 | AGC frequency deviation coefficient adjusting method, system and device for inhibiting frequency oscillation |
| CN113742931A (en) * | 2021-09-13 | 2021-12-03 | 中国电子信息产业集团有限公司第六研究所 | Block chain edge safety detection method, system and electronic equipment |
| CN116613751A (en) * | 2023-07-19 | 2023-08-18 | 国网江西省电力有限公司电力科学研究院 | Small interference stability analysis method and system for new energy grid-connected system |
| CN117937520A (en) * | 2024-03-20 | 2024-04-26 | 国网江西省电力有限公司电力科学研究院 | New energy multi-machine system stability analysis method and system |
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| CN111864744A (en) * | 2020-07-31 | 2020-10-30 | 国网四川省电力公司电力科学研究院 | Online switching method and system for control modes of speed regulator of high-proportion hydroelectric system |
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| CN113742931A (en) * | 2021-09-13 | 2021-12-03 | 中国电子信息产业集团有限公司第六研究所 | Block chain edge safety detection method, system and electronic equipment |
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| CN116613751A (en) * | 2023-07-19 | 2023-08-18 | 国网江西省电力有限公司电力科学研究院 | Small interference stability analysis method and system for new energy grid-connected system |
| CN116613751B (en) * | 2023-07-19 | 2023-11-07 | 国网江西省电力有限公司电力科学研究院 | Small interference stability analysis method and system for new energy grid-connected system |
| CN117937520A (en) * | 2024-03-20 | 2024-04-26 | 国网江西省电力有限公司电力科学研究院 | New energy multi-machine system stability analysis method and system |
| CN117937520B (en) * | 2024-03-20 | 2024-07-05 | 国网江西省电力有限公司电力科学研究院 | New energy multi-machine system stability analysis method and system |
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Effective date of registration: 20220719 Address after: No.73 Tuodong Road, Guandu District, Kunming, Yunnan 650011 Applicant after: YUNNAN POWER GRID Co.,Ltd. Address before: No.73 Tuodong Road, Guandu District, Kunming, Yunnan 650011 Applicant before: YUNNAN POWER GRID Co.,Ltd. Applicant before: Tsinghua University |
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Application publication date: 20200310 |