CN109286185B - System and method for determining maximum power supply capacity of transformer substation - Google Patents
System and method for determining maximum power supply capacity of transformer substation Download PDFInfo
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- CN109286185B CN109286185B CN201710591347.1A CN201710591347A CN109286185B CN 109286185 B CN109286185 B CN 109286185B CN 201710591347 A CN201710591347 A CN 201710591347A CN 109286185 B CN109286185 B CN 109286185B
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
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Abstract
The invention discloses a system for determining the maximum power supply capacity of a transformer substation. The system comprises an initial electrical parameter providing module, a control module and a control module, wherein the initial electrical parameter providing module is used for providing initial electrical parameters of a transformer substation system; the data preprocessing module is used for preprocessing the initial electrical parameters, calculating the per unit value of the high-medium impedance and removing the minimum value of the per unit value of the high-medium impedance; the maximum power supply capacity calculation module is used for calculating the maximum power supply capacity value of the transformer substation system; the matrix calculation module is used for carrying out matrixing treatment on the maximum power supply capacity value and the high-medium impedance per unit value of the transformer substation system so as to obtain a maximum power supply capacity calculation matrix and solving the maximum power supply capacity calculation matrix; and a result export module for exporting the calculation result of the matrix calculation module and visually presenting the calculation result. The invention also discloses a method for determining the maximum power supply capacity of the transformer substation. The system and the method have good universality, expansibility and intelligence, and can effectively improve the calculation efficiency.
Description
Technical Field
The invention relates to the technical field of power grids, in particular to a system and a method for determining the maximum power supply capacity of a transformer substation.
Background
As the overall development of the load is slowed down, the development of the power grid scale is gradually saturated, the gravity center of the power transmission and transformation project is gradually increased by ' new construction ' turning to capacity ', ' extension ', ' transformation ', and the like, which means that the power grid project is complicated in transition period, the project quantity is increased, the project construction period is shortened, and the like, and the accuracy, the specialty, the universality and the calculation efficiency of the system are required to be higher.
When a plurality of transformers are operated in parallel, the situation of uneven power distribution born by different transformers can occur, and the long-term operation not only has influence on the whole power supply capacity, but also is unfavorable for the economic and safe operation of equipment, and the utilization rate of partial equipment is lower or higher. Therefore, the calculation of the maximum power supply capacity of the transformer substation not only can provide scientific basis for the research on the feasibility of the schemes of various power transmission and transformation projects in power grid planning, but also can measure the matching degree of load supply and demand during project transition, and assist in making schemes such as construction, power failure and the like during the transition.
The traditional method of the related power units is poor in interactivity and accuracy, and has large defects in universality against different calculation boundary conditions, so that the efficiency is low.
Therefore, there is an urgent need in the art to develop a system and method that can intelligently, quickly and accurately determine the maximum power supply capacity of a substation.
Disclosure of Invention
The invention aims to provide a system and a method capable of quickly and intelligently determining the maximum power supply capacity of a transformer substation.
In a first aspect of the invention, the invention provides a system for determining a maximum power capacity of a substation. The system comprises:
the initial electrical parameter providing module is used for providing initial electrical parameters of the substation system;
the data preprocessing module is used for preprocessing the initial electrical parameters of the initial electrical parameter providing module, calculating the per unit value of the high-medium impedance and removing the minimum value of the per unit value of the high-medium impedance;
the maximum power supply capacity calculation module is used for calculating the maximum power supply capacity value of the transformer substation system;
the matrix calculation module is used for carrying out matrixing treatment on the maximum power supply capacity value and the high-medium impedance per unit value of the transformer substation system so as to obtain a maximum power supply capacity calculation matrix and solving the maximum power supply capacity calculation matrix; and
the result export module is used for exporting the calculation result of the matrix calculation module and visually presenting the calculation result;
the initial electrical parameter providing module is connected with the data preprocessing module and the maximum power supply capacity calculating module, the data preprocessing module is connected with the matrix calculating module and the maximum power supply capacity calculating module, and the matrix calculating module is connected with the result deriving module.
In another preferred embodiment, the system further comprises a control system.
Preferably, the control system is connected with a substation system.
Preferably, the control system is connected with the result deriving module.
Preferably, the initial electrical parameter providing module is connected to a substation system.
In another preferred embodiment, the initial electrical parameter providing module further comprises a data manual input module.
In another preferred embodiment, the system further comprises a result display module.
Preferably, the result display module is a display;
preferably, the result export module is connected with the result display module.
In a second aspect of the invention, the invention provides a method of determining the maximum power capacity of a substation. The method comprises the following steps:
(a) Providing a substation system, and acquiring initial electrical parameters of the system, wherein the initial electrical parameters are selected from the following groups: main transformer number, power factor, allowable overload multiple, main transformer capacity and high-medium impedance value;
(b) Preprocessing the initial electrical parameters and obtaining a high-medium impedance per unit value;
(c) Calculating the maximum power supply capacity value of the transformer substation system;
(d) Performing matrixing treatment on the per unit value of the high-medium impedance and the maximum power supply capacity value of the transformer substation system to obtain a maximum power supply capacity calculation matrix XP=P'; and
(e) Calculating the power born by each main transformer according to the maximum power supply capacity calculation matrix;
wherein X is an impedance matrix, P' is a transformer substation maximum power matrix, and P is a main transformer power distribution matrix to be solved.
Preferably, step (b) further comprises removing the minimum value of the per unit value of the high-medium impedance.
Each element in the impedance matrix X is defined as follows:
where i, j=1 to N, N is the number of main transformers.
Each element in the transformer substation maximum power matrix P' is defined as follows:
where i, j=1 to N, N is the number of main transformers.
The maximum power supply capacity value of the transformer substation is calculated according to the following principle:
the main transformer N-1 operates in a mode that the rest main transformer is overloaded by a certain multiple, and simultaneously, the principle that the power and the impedance of the main transformer are inversely proportional is considered.
The maximum power supply capacity value of the substation system is calculated according to the following formula:
wherein Pmax is the maximum power supply capacity value of the transformer substation,
x min ＝min[x i ]，[x i ]to remove the impedance array after main transformer with the minimum impedance per unit value,
k is the allowable overload multiple and,
cos theta is the power factor and is used to control the power,
S i in order to be the main variable capacity,
x i is a high-medium impedance value, and the impedance value is high,
i=1 to N-1, N being the number of main transformers.
The maximum power supply capacity calculation matrix xp=p' is expressed as follows:
wherein x is i* I=1 to N-1, N is the number of main transformers, which is the per unit value of the high-medium impedance.
It is understood that within the scope of the present invention, the above-described technical features of the present invention and technical features specifically described below (e.g., in the examples) may be combined with each other to constitute new or preferred technical solutions. And are limited to a space, and are not described in detail herein.
Drawings
Fig. 1 is a schematic diagram of a system for determining a maximum power supply capability according to the present invention.
Detailed Description
The inventor of the invention is subjected to extensive and intensive research, and develops a system and a method for intelligently, quickly and accurately determining the maximum power supply capacity of a transformer substation aiming at different calculation boundaries for the first time. Aims at solving the following problems: aiming at the problems of uneven power distribution and limited overall power supply capacity in the transformer substation under different power grid boundaries, intelligent, rapid and accurate calculation and visual result derivation are performed, and scientific basis is provided for power grid engineering scheme feasibility research and power grid staff load allocation.
When a plurality of transformers are operated in parallel, when the impedance or the capacity of different transformers is inconsistent, the equivalent impedance of the transformers is inconsistent (x1 not equal to x2 not equal to x 3), so that the situation of uneven power distribution (IL 1 not equal to IL2 not equal to IL 3) borne by the different transformers is caused, the calculation of the maximum power supply capacity of the transformer substation is needed, on one hand, the load carried by the transformer substation can be planned and allocated, and the transformer substation does not need to be subjected to load transfer or cutting instantly under the condition of ensuring the fault or maintenance of any main transformer; on the other hand, the proportion of the power born by different main transformers can be measured, and the utilization rate of the equipment can be conveniently checked.
The main purpose of the invention is that: the method for determining the maximum power supply capacity of the transformer substation in a matrix mode is provided, aiming at different calculation boundaries, calculation can be intelligently, rapidly and accurately carried out, visual results are derived, and scientific basis is provided for the feasibility research of a power grid project scheme and the load allocation of power grid staff.
The present invention has been completed on the basis of this finding.
Terminology
As used herein, the term "maximum power capacity of a substation" refers to the maximum power that a substation should withstand under reasonable conditions when it has multiple main transformers, and when the actual load of the substation does not exceed the maximum power capacity, it can be ensured that the substation does not need to be instantaneously load transferred or cut off under the condition that any main transformer fails or overhauls.
As used herein, the term "N-1 mode of operation" refers to when any one of the N elements of the power system fails and is cut out, should not cause a user power outage due to overload trip of other equipment; the system stability is not destroyed, and accidents such as voltage breakdown and the like are avoided.
The main advantages of the invention include:
(a) The method and the system for determining the maximum power supply capacity of the transformer substation can intelligently, rapidly and accurately calculate and derive visual results according to different calculation boundaries, and provide scientific basis for the feasibility research of the power grid engineering scheme and the load allocation of power grid staff;
(b) The method has good universality, expansibility and intelligence, and can effectively improve the calculation efficiency.
The method for determining the maximum power supply capacity of the transformer substation comprises the following steps of, wherein N is the number of main transformers.
(1) Calculating the per unit value of the main transformer impedance according to different input data;
(2) According to 1 main transformer N-1, the residual main transformer is overloaded by a certain multiple, and simultaneously, the principle that the main transformer power and the impedance are inversely proportional is considered, the maximum power supply capacity Pmax of the transformer substation is calculated;
(3) Matrixing on the basis to form a maximum power supply capacity calculation matrix XP=P'; x is an impedance matrix, P' is a transformer substation maximum power matrix, and P is a main transformer power distribution matrix to be solved.
The definition of each matrix is as follows:
i,j＝1～N
the matrixing of the input information can lead the method of the invention to have good universality and be applicable to different calculation boundary conditions.
The invention will be further illustrated with reference to specific examples. It is to be understood that these examples are illustrative of the present invention and are not intended to limit the scope of the present invention.
It should be noted that in the claims and the description of this patent, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Example 1
As shown in fig. 1, is a typical configuration of a system for determining maximum power supply capability according to the present invention. The system comprises: the initial electrical parameter providing module is used for providing initial electrical parameters of the substation system; the data preprocessing module is used for preprocessing the initial electrical parameters of the initial electrical parameter providing module, calculating the per unit value of the high-medium impedance and removing the minimum value of the per unit value of the high-medium impedance; the maximum power supply capacity calculation module is used for calculating the maximum power supply capacity value of the transformer substation system; the matrix calculation module is used for carrying out matrixing treatment on the maximum power supply capacity value and the high-medium impedance per unit value of the transformer substation system so as to obtain a maximum power supply capacity calculation matrix and solving the maximum power supply capacity calculation matrix; the result export module is used for exporting the calculation result of the matrix calculation module and visually presenting the calculation result; the initial electrical parameter providing module is connected with the data preprocessing module and the maximum power supply capacity calculating module, the data preprocessing module is connected with the matrix calculating module and the maximum power supply capacity calculating module, and the matrix calculating module is connected with the result deriving module. The result exported by the result export module comprises a voltage gear, a voltage value and a circulation current of the voltage regulating side of each main transformer.
Example 2
Four main transformers are present at a certain 500kV transformer substation in a certain area, wherein the main transformer capacities of #1 and #2 are 750MVA; the main transformer capacities of #3 and #4 are 1000MVA, the main transformers of #1 and #2 are modified into 2X 1200MVA according to the engineering project, and the parameters of the main transformers are as follows:
main transformer #1, #2 (before modification): the high-medium impedance is 14%;
main transformer #1, #2 (after modification): the high-medium impedance is 22%;
#3, #4 main variants: the high-medium impedance is 16%;
two schemes can be proposed during the transition of the project: the main transformers #1 and #2 are removed and replaced in turn (scheme one); the main transformers #1 and #2 are removed and replaced simultaneously (scheme II); the maximum power supply capacity of the substation system at each stage of two schemes is determined by the method, and the results are shown in table 1. On the basis of determining the maximum power supply capacity, carrying out power balance analysis by combining load prediction, power supply planning and seasonal load coefficients of the subareas where the transformer substation is located, and the results are shown in table 2.
Table 1 maximum power capability calculation
Table 2 partition power balance calculation unit: MW (MW)
(1) Transition scheme selection
The power supply capacity of the transformer substation during the transition period of the scheme I is obviously larger than that of the scheme II, and the scheme I is recommended to be selected as a transition scheme;
(2) Power outage planning during transitions
In order to meet the load demand as much as possible and reduce the load transfer quantity, the power failure construction of the main transformer #1 is recommended to be started in the autumn of 2016, and the main transformer #1 is modified and completed before the summer of 2017; and starting the power failure construction of the main transformer #2 in autumn in 2017, and finishing the main transformer #2 before the summer in 2018.
According to the analysis of the engineering examples, the method can more accurately and efficiently calculate the maximum power supply capacity, and has good guiding significance for the design and decision of various system schemes in actual engineering.
All documents mentioned in this application are incorporated by reference as if each were individually incorporated by reference. Further, it will be appreciated that various changes and modifications may be made by those skilled in the art after reading the above teachings, and such equivalents are intended to fall within the scope of the claims appended hereto.
Claims (10)
1. A method of determining a maximum power capacity of a substation, the method comprising the steps of:
(a) Providing a substation system, and acquiring initial electrical parameters of the system, wherein the initial electrical parameters are selected from the following groups: main transformer number, power factor, allowable overload multiple, main transformer capacity and high-medium impedance value;
(b) Preprocessing the initial electrical parameters and obtaining a high-medium impedance per unit value;
(c) Calculating the maximum power supply capacity value of the transformer substation system;
(d) Performing matrixing treatment on the per unit value of the high-medium impedance and the maximum power supply capacity value of the transformer substation system to obtain a maximum power supply capacity calculation matrix XP=P'; and
(e) Calculating the power born by each main transformer according to the maximum power supply capacity calculation matrix;
wherein X is an impedance matrix, P' is a transformer substation maximum power matrix, and P is a main transformer power distribution matrix to be solved;
wherein step (b) further comprises removing a minimum value of the per unit value of the high-medium impedance;
wherein, each element in the impedance matrix X is defined as follows:
wherein i, j=1 to N, N is the number of main transformers;
wherein, each element in the transformer substation maximum power matrix P' is defined as follows:
wherein i, j=1 to N, N is the number of main transformers;
the maximum power supply capacity value of the transformer substation system is calculated according to the following formula:
wherein Pmax is the maximum power supply capacity value of the transformer substation,
x min ＝min[x i ]，[x i ]to remove the impedance array after main transformer with the minimum impedance per unit value,
k is the allowable overload multiple and,
cos theta is the power factor and is used to control the power,
S i in order to be the main variable capacity,
x i is a high-medium impedance value, and the impedance value is high,
i=1 to N-1, N is the number of main transformers;
the maximum power supply capacity calculation matrix xp=p' is expressed as follows:
wherein x is i* I=1 to N-1, N is the number of main transformers, which is the per unit value of the high-medium impedance.
2. The method of claim 1, wherein the method is performed by a system for determining a maximum power capacity of a substation, the system comprising:
the initial electrical parameter providing module is used for providing initial electrical parameters of the substation system;
the data preprocessing module is used for preprocessing the initial electrical parameters of the initial electrical parameter providing module, calculating the per unit value of the high-medium impedance and removing the minimum value of the per unit value of the high-medium impedance;
the maximum power supply capacity calculation module is used for calculating the maximum power supply capacity value of the transformer substation system;
the matrix calculation module is used for carrying out matrixing treatment on the maximum power supply capacity value and the high-medium impedance per unit value of the transformer substation system so as to obtain a maximum power supply capacity calculation matrix and solving the maximum power supply capacity calculation matrix; and
the result export module is used for exporting the calculation result of the matrix calculation module and visually presenting the calculation result;
the initial electrical parameter providing module is connected with the data preprocessing module and the maximum power supply capacity calculating module, the data preprocessing module is connected with the matrix calculating module and the maximum power supply capacity calculating module, and the matrix calculating module is connected with the result deriving module.
3. The method of claim 2, wherein the system further comprises a control system.
4. A method according to claim 3, wherein the control system is connected to a substation system.
5. A method as claimed in claim 3, wherein the control system is connected to the result derivation module.
6. The method of claim 2, wherein the initial electrical parameter providing module is coupled to a substation system.
7. The method of claim 2, wherein the initial electrical parameter providing module further comprises a data manual input module.
8. The method of claim 2, wherein the system further comprises a results display module.
9. The method of claim 8, wherein the results display module is a display.
10. The method of claim 8, wherein the result derivation module is coupled to a result display module.
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| WO2012155494A1 (en) * | 2011-05-16 | 2012-11-22 | 河北省电力研究院 | Verifying method of optimal control parameter in whole network for automatic voltage control system |
| KR20150111458A (en) * | 2014-03-24 | 2015-10-06 | 서울과학기술대학교 산학협력단 | High-Speed Method for Large Scale Power Systems |
| CN104899677A (en) * | 2015-05-06 | 2015-09-09 | 广东工业大学 | Quick estimation method for load maximum reactive power command of 500kv radial power supply network in disruption recovery |
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