CN110380410B - Dynamic aggregation method and system for parameters of generator speed regulator - Google Patents
Dynamic aggregation method and system for parameters of generator speed regulator Download PDFInfo
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- CN110380410B CN110380410B CN201910647880.4A CN201910647880A CN110380410B CN 110380410 B CN110380410 B CN 110380410B CN 201910647880 A CN201910647880 A CN 201910647880A CN 110380410 B CN110380410 B CN 110380410B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
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Abstract
The invention discloses a dynamic parameter aggregation method and a system for a generator speed regulator, which comprises the following steps: calculating the rotating reserve capacity and active power regulation performance index of each generator i in the generator set to be aggregated; classifying the generators in the generator set according to the type of the speed regulator; summing the active regulation performance indexes of the same type of speed regulators to obtain the regulation performance indexes of different types of speed regulators, and calculating the average regulation performance index of each type of speed regulators; determining the type of a speed regulator of the equivalent generator; and dynamic aggregation is performed on the parameters of the speed regulator of the generator adopting the speed regulator. The invention provides a model selection and parameter aggregation method of a generator speed regulator in a power grid equivalence process by aiming at keeping the active rotary standby capacity and the overall regulation characteristic of a unit before and after equivalence unchanged, and the dynamic aggregation calculation speed is high and the engineering accuracy is high.
Description
Technical Field
The invention belongs to the technical field of power systems and automation thereof, and relates to a dynamic parameter aggregation method and a dynamic parameter aggregation system for a generator speed regulator.
Background
When large-scale alternating current and direct current power grid electromagnetic transient modeling is carried out, multiple generators are generally required to be equivalent. The existing research results focus on dynamic equivalent aggregation of generator body parameters, and neglect control systems (an exciter, a speed regulator, a PSS and the like). In the equivalent process of the speed regulator, the selection and calculation of each parameter are not paid enough attention all the time, and the effectiveness of the parameter directly influences the response characteristic of the generator to various types of power impact disturbance which can occur in the power grid.
At present, there is no clear formula derivation and algorithm for the value problem of the speed regulator parameters of the equivalent generator, and the final parameters are mostly determined by adopting experience values and combining comparison and iterative adjustment of multiple simulation curves. The method is completely valued by the experience of workers, and has the advantages of high difficulty, long time consumption and low accuracy.
Disclosure of Invention
The purpose of the invention is: aiming at the defects of the prior art, the dynamic aggregation method and the system for the generator speed regulator parameters based on the adjustment performance index weighting are provided, the dynamic aggregation calculation speed is high, and the engineering accuracy is high.
Specifically, the invention is realized by adopting the following technical proposal,
the invention discloses a dynamic polymerization method for parameters of a generator speed regulator, which comprises the following steps:
calculating the rotation reserve capacity P of the generator i in the set of generators { G } to be aggregated Ri Wherein, i =1,2, \8230, M and M are the number of the generators;
according to the reserve capacity P of rotation Ri Calculating the active power regulation performance index F of the generator i in the generator set (G) i ；
Classifying generators { G } in the generator set according to the type of the speed regulator; for active regulation performance index F adopting same type of speed regulator i Summing to obtain the regulation performance index of the j-th type speed regulator and F tj And calculating the average regulation performance index of the j-type speed regulator
Wherein j =1,2, \8230, T, T is the total number of types;
average regulation performance index according to T-type speed regulator
Sorting, selecting the kth speed regulator as an equivalent generator speed regulator, wherein the number of generators corresponding to the kth speed regulator is N tk (ii) a And dynamically aggregating the parameters of the equivalent generator speed regulator.
Preferably, the reserve capacity P of rotation of the generator i Ri The calculation formula is as follows:
P Ri ＝P ei ·(μ i -σ i ) (1)
wherein, P ei Is the rated active output, mu, of the generator i i For maximum opening of governor valve, sigma i The minimum opening degree of the governor is obtained.
Preferably, the active power regulation performance index F of the generator i i The calculation formula is as follows:
F i ＝P Ri ·K i (2)
wherein, K i The gain is amplified for the speed deviation.
As a preferred aspect of the present invention,
preferably, the step of selecting the kth class speed regulator as the equivalent generator speed regulator is as follows:
finding out the class a speed regulator with the maximum average adjusting performance index and finding out the class b speed regulator with the maximum number of sets, wherein a and b belong to [1, T ];
if it is
Selecting the class a speed regulator as an equivalent generator speed regulator, or selecting the class b speed regulator as the equivalent generator speed regulator; wherein, the first and the second end of the pipe are connected with each other,
for the average adjustment performance index of the class a speed regulator,
and the average regulation performance index of the class b speed regulator is shown, cset is a type selection threshold, and the default is 1.2.
Preferably, the equivalent generator governor parameters include：P e_eq 、P R_eq 、X _eq Rated active power of the aggregated equivalent generator, the spinning reserve capacity of the aggregated equivalent generator and the speed regulator parameters of the aggregated equivalent generator are respectively; wherein, the aggregated equivalent generator speed regulator parameters at least comprise one of the following parameters: the maximum opening degree of a speed regulator, the minimum opening degree of a speed regulator, a primary frequency modulation limiting threshold and a rotating speed deviation amplification gain; calculating P e_eq 、P R_eq 、X _eq The formula is as follows:
wherein M is the number of generators, F j Is the average regulation performance index, X, of the jth stage of the kth type speed regulator j The speed regulator parameters of the jth station of the kth speed regulator at least comprise one of the following parameters: the maximum opening degree of a speed regulator, the minimum opening degree of a speed regulator, a primary frequency modulation limiting threshold and a rotating speed deviation amplification gain.
Preferably, if the generator i does not have a speed regulator, P of the generator i ei 、μ i 、σ i 、F i The calculation formula is as follows:
wherein S is ei For rated capacity of the generator, P 0i For the active power output of the generator in a given operating mode,
for power factor, default is 0.85.
Preferably, if the generator i adopts an electro-hydraulic speed regulator and neither a load controller nor a regulation-stage pressure controller is put into operation, the rotating reserve capacity P of the generator i Ri The calculation formula is as follows:
P Ri ＝min[P ei ·(μ i -σ i )，2P ei ·L i ·K i ]
wherein L is i The threshold is limited for primary frequency modulation.
The invention discloses a dynamic parameter aggregation system of a generator speed regulator, which comprises a network interface, a memory and a processor, wherein the network interface is connected with the memory; wherein, the first and the second end of the pipe are connected with each other,
the network interface is used for receiving and sending signals in the process of receiving and sending information with other external network elements;
the memory for storing computer program instructions executable on the processor;
the processor is used for executing the steps of the dynamic aggregation method of the parameters of the generator speed regulator when the computer program instructions are executed.
The invention has the following beneficial effects: the invention provides a model selection and parameter aggregation method of a generator speed regulator in a power grid equivalence process by aiming at keeping the active rotary standby capacity and the overall regulation characteristic of a unit before and after equivalence unchanged, the dynamic aggregation calculation speed is high, the engineering accuracy is high, and a referable solution is provided for realizing the dynamic equivalence calculation of a generator control system.
Drawings
FIG. 1 is a work flow diagram of the method of the present invention;
FIG. 2 is a geographical wiring diagram of a practical grid;
FIG. 3 is a comparison of frequency response curves of a bus in a reserved system before and after equivalence after dynamic equivalence is performed on the power grid shown in FIG. 2 based on the method of the present invention.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The present invention will be further described with reference to the accompanying drawings. Referring to fig. 1, the dynamic aggregation method for generator governor parameters based on adjustment performance index weighting of the present invention includes the following steps:
as shown in fig. 2, a500 kV station CYA500 is connected to a 220kV grid in the area via 2 main transformers. The 220kV power grid comprises 11 units, and specific information is shown in Table 1.
Table 1 regional power grid 11 unit information
According to the method, firstly, load flow calculation is carried out on a power grid, and active output of 11 generators in a given operation mode is obtained.
1) Calculating the rotation reserve capacity of each generator;
2) Calculating the active power regulation performance indexes of the generator to obtain that the active power regulation performance indexes of CBX # 1-CBX #3 are 81.25, the active power regulation performance indexes of Chuandongfeng # 1-Chuandongfeng #2 are 26.25, the active power regulation performance index of CFX #1 is 50, the active power regulation performance indexes of CJJ # 1-CJJ #2 are 26.4, the active power regulation performance indexes of CLX # 1-CLX #2 are 41.8 and the active power regulation performance index of CXG #1 is 66.6.
3) Two different speed regulators are arranged in the power grid, wherein 7 GM type speed regulators and 4 GN type speed regulators respectively sum active power regulation performance indexes of the two speed regulators to obtain the regulation performance indexes of the speed regulators. And calculating the average regulation performance indexes of the two types of speed regulators.
4) The GM type is determined according to the invention method step 5 as the governor type of the equivalence machine.
5) And calculating to obtain key parameters of the speed regulation of the equivalent machine according to a formula 3: p e_eq =441MW, and the maximum opening of the governor is mu _eq =1.03, primary frequency modulation limit threshold L _eq =0.166, and the amplification gain of the rotational speed deviation is K _eq ＝1.3。
According to the simulation analysis requirement, the power grid is divided into two parts: regarding the part which needs attention and does not allow equivalent simplification in the simulation process as a reserved system; and the other part is regarded as an equivalent system, and the generators in the equivalent system are taken as a set of generators to be aggregated. The same power disturbance simulation is respectively carried out on the power grids before and after the equivalence, and the frequency response pair of a certain bus selected in the system is reserved, as shown in fig. 3; the frequency response is also given empirically when typical values are used (i.e. maintaining the rated power of the unit, the rotational reserve capacity). It can be seen that the speed regulator parameters obtained based on the method of the invention can better preserve the frequency response characteristics of the original power grid.
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 so forth) 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 flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations 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.
Although the present invention has been described in terms of the preferred embodiment, it is not intended that the invention be limited to the embodiment. Any equivalent changes or modifications made without departing from the spirit and scope of the present invention are also within the protection scope of the present invention. The scope of the invention should therefore be determined with reference to the appended claims.
Claims (9)
1. A dynamic polymerization method for generator speed regulator parameters is characterized by comprising the following steps:
calculating the rotation reserve capacity P of the generator i in the set of generators { G } to be aggregated Ri Wherein, i =1,2, \8230, M and M are the number of the generators;
according to the reserve capacity P of rotation Ri Calculating the active power regulation performance index F of the generator i in the generator set (G) i ；
Classifying generators { G } in the generator set according to the type of the speed regulator; for active regulation performance index F adopting same type speed regulator i Summing to obtain the regulation performance index of the j-th type speed regulator and F tj And calculating the average regulation performance index of the j-type speed regulator
Wherein j =1,2, \8230, T, T is the total number of types;
average regulation performance index according to T-type speed regulator
Sorting, selecting the kth speed regulator as an equivalent generator speed regulator, wherein the number of generators corresponding to the kth speed regulator is N tk ；
Dynamically aggregating the equivalent generator speed regulator parameters;
the step of selecting the kth class speed regulator as the equivalent generator speed regulator is as follows:
finding out the class a speed regulator with the maximum average adjusting performance index and finding out the class b speed regulator with the maximum number of sets, wherein a and b belong to [1, T ];
if it is
Selecting the a-th speed regulator as the equivalent generator speed regulator, otherwise selecting the b-th speed regulator as the equivalent generator speed regulator; wherein the content of the first and second substances,
the performance index of the average regulation of the class a speed regulator is obtained,
and the performance index is averagely adjusted for the class b speed regulator, and Cset is a model selection threshold.
2. The dynamic aggregation method of generator governor parameters of claim 1,
reserve capacity P of rotation of the generator i Ri The calculation formula is as follows:
P Ri ＝P ei ·(μ i -σ i ) (1)
wherein, P ei Is the rated active output, mu, of the generator i i For maximum opening of governor valve, sigma i The minimum opening degree of the governor is obtained.
3. The dynamic aggregation method of generator governor parameters of claim 1, characterized in that the determination method of the set of generators is as follows: active power regulation performance index F of the generator i i The calculation formula is as follows:
F i ＝P Ri ·K i (2)
wherein, K i Amplifying gain for the rotation speed deviation;
the average adjustment performance index
The calculation formula is as follows:
4. the generator governor parameter dynamic aggregation method of claim 1, wherein the Cset takes 1.2.
5. The generator governor parameter dynamic aggregation method of claim 1, wherein the equivalent generator governor parameters include: p e_eq 、P R_eq 、X _eq Rated active power of the aggregated equivalent generator, the spinning reserve capacity of the aggregated equivalent generator and the speed regulator parameters of the aggregated equivalent generator are respectively; wherein, the aggregated equivalent generator speed regulator parameters at least comprise one of the following parameters: the maximum opening degree of a speed regulator, the minimum opening degree of a speed regulator, a primary frequency modulation limiting threshold and a rotating speed deviation amplification gain; calculating P e_eq 、P R_eq 、X _eq The formula is as follows:
wherein M is the number of generators, F j Is the average regulation performance index, X, of the jth platform of the kth type speed regulator j The speed regulator parameters of the jth station of the kth speed regulator at least comprise one of the following parameters: maximum opening degree of a speed regulator, minimum opening degree of a speed regulator, a primary frequency modulation limiting threshold, a rotation speed deviation amplification gain, P ei Is the rated active output of the generator i.
6. The dynamic aggregation method of generator governor parameter of claim 1, wherein if generator i does not have a governor, P of generator i ei 、μ i 、σ i 、F i The calculation formula is as follows:
wherein S is ei For rated capacity of the generator, P 0i For the active output of the generator in a given operating mode,
is a power factor, P ei Is the rated active output, mu, of the generator i i For maximum opening of governor valve, σ i For minimum opening of governor, K i The gain is amplified for the speed deviation.
7. The generator governor parameter dynamic aggregation method of claim 6, wherein the method is characterized by
0.85 was taken.
8. The method of claim 1, wherein if the generator i uses an electro-hydraulic governor and neither a load controller nor a regulation stage pressure controller is engaged, the generator i has a reserve capacity P for rotation Ri The calculation formula is as follows:
P Ri ＝min[P ei ·(μ i -σ i )，2P ei ·L i ·K i ]
wherein L is i Limiting the threshold for primary frequency modulation, P ei Is the rated active output, mu, of the generator i i For maximum opening of governor valve, sigma i For minimum opening of governor, K i And amplifying gain for the rotation speed deviation.
9. A generator governor parameter dynamic aggregation system, the system comprising a network interface, a memory, and a processor; wherein the content of the first and second substances,
the network interface is used for receiving and sending signals in the process of receiving and sending information with other external network elements;
the memory to store computer program instructions operable on the processor;
the processor, when executing the computer program instructions, performing the steps of the generator governor parameter dynamic aggregation method of any of claims 1 to 8.
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| CN105281319A (en) * | 2015-08-14 | 2016-01-27 | 国电南瑞科技股份有限公司 | Generator parameter dynamic aggregation method based on weighted least spuare method |
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| CN1967960A (en) * | 2006-09-29 | 2007-05-23 | 天津大学 | Coherency generating sets of electric power system and polymeric method of asynchronous motor group parameter |
| WO2012055115A1 (en) * | 2010-10-29 | 2012-05-03 | Abb Research Ltd. | Integrated excitation and turbine controller for synchronous generator and control method thereof |
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