CN109254187A - A kind of system and method for determining transformer substation system short circuit current - Google Patents
A kind of system and method for determining transformer substation system short circuit current Download PDFInfo
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Abstract
The invention discloses a kind of systems of determining transformer substation system short circuit current.The system includes that initial electric parameter provides module, for providing the initial electric parameter of transformer substation system；Data preprocessing module calculates standard reduced value for pre-processing to initial electric parameter；Matrix computing module, for carrying out matrixing processing to standard reduced value, to obtain admittance matrix；Error coefficient computing module for calculating the voltage coefficient of transformer substation system, and combines admittance matrix to calculate short circuit current；And result export module is visually presented with calculated result for exporting calculation of short-circuit current result.The invention also discloses a kind of methods of determining transformer substation system short circuit current.For system and method for the invention in the case where considering different calculating principles, energy is convenient, fast and accurately carries out distant view short circuit current prospect and engineering calculation of short-circuit current.
Description
Technical field
The present invention relates to electric power network technique field, relate more specifically to a kind of determining transformer substation system short circuit current system and
Method.
Background technique
Stage tends to be saturated for the development of power grid scale, and the center of gravity of project of transmitting and converting electricity gradually " is increased by " newly-built " steering
Appearance ", " enlarging ", " transformation " etc., it means that transition period complication will occur for electricity power engineering, engineering quantity increases, engineering is built
If cycle time etc. changes, this will face higher want to the accuracy, professional, versatility and computational efficiency of system-computed
It asks.
Core foundation of the calculation of short-circuit current as grid equipment type selecting is provided with weight in Practical Project and Electric Power Network Planning
Want meaning.To improve Engineering Task efficiency, different calculating principles, convenient accurate progress distant view short circuit current water how are considered
The problem of open and flat prestige and rapid cut-off galvanometer need system projector further to improve at last.
The correctness of existing implementation or its result is established on basis detailed, complicated, accurate modeling to power grid
On, and under different calculating principles, carry out the rapid cut-off galvanometer in the specific short circuit current level prospect of distant view and engineering
When calculation, redundancy and cumbersome is then shown slightly using professional software；Simplified calculating can only be carried out, interactivity and accuracy are poor,
And different calculation of boundary conditions are faced, versatility also leads to inefficiency there are larger defect.
Therefore, this field is badly in need of developing a kind of system and method for new quick determining transformer substation system short circuit current.
Summary of the invention
The object of the present invention is to provide a kind of system and methods for rapidly and accurately determining transformer substation system short circuit current.
In the first aspect of the present invention, the present invention provides a kind of systems of determining transformer substation system short circuit current.It is described
System includes:
Initial electric parameter provides module, for providing the initial electric parameter of transformer substation system；
Data preprocessing module obtains the initial electric parameter for providing module from the initial electric parameter, and
The initial electric parameter is pre-processed, standard reduced value is calculated；
Matrix computing module carries out matrixing processing for the standard reduced value to the data preprocessing module, thus
Obtain admittance matrix；
Error coefficient computing module, for calculating the voltage coefficient of the transformer substation system, and in conjunction with the admittance matrix
Short circuit current is calculated, and
As a result export module can for exporting the calculation of short-circuit current result of the error coefficient computing module
Calculated result is presented depending on changing ground；
Wherein, the initial electric parameter provides module and connect with the data preprocessing module, the data prediction
Module is connect with the matrix computing module, the error coefficient computing module and the matrix computing module and the result
Export module connection.
In another preferred example, the system also includes control systems.
In another preferred example, the control system is connect with transformer substation system.
In another preferred example, the control system is connect with the result export module.
In another preferred example, the initial electric parameter provides module and connect with transformer substation system.
In another preferred example, it further includes data manual input module that the initial electric parameter, which provides module,.
In another preferred example, the system also includes result display modules.
In another preferred example, the result display module is display.
In another preferred example, the result export module is connect with result display module.
In the second aspect of the present invention, the present invention provides a kind of methods of determining transformer substation system short circuit current.It is described
Method the following steps are included:
(a) transformer substation system is provided, the initial electric parameter of the system is obtained；The initial electric parameter includes master
It is short to become number of units, power grid voltage rating, nominal voltage, capacity, practical tap voltage, main transformer impedance and height/medium voltage side system side
Road electric current；
(b) the initial electric parameter is pre-processed, calculates standard reduced value；
(c) matrixing processing is carried out to the standard reduced value, obtains N platform transformer admittance matrix Y arranged side by side；
(d) voltage coefficient of the transformer substation system is calculated by the initial electric parameter；And
(e) the short circuit current result of the transformer substation system is calculated by the admittance matrix Y and the voltage coefficient.
The standard reduced value includes: main transformer impedance per unit value, height, medium voltage side system impedance per unit value and low-pressure side string
Anti- per unit value.
In another preferred example, the standard reduced value further includes non-standard no-load voltage ratio conversion factor.
Each element Y in the admittance matrix YijIt is defined as follows:
Wherein, i, j=1~2N+2；
N is transformer number of units；
x(s1)For high-side system impedance per unit value；
x(s2)For medium voltage side system impedance per unit value；
xcn*For the anti-per unit value of low-pressure side string；
x(1)n*, x(2)n*, x(3)n*For main impedance per unit value；
k(1)n, k(2)n, k(3)nFor non-standard no-load voltage ratio conversion factor；
N=1~N+2.
The short circuit current result is by InIt indicates:
Wherein, ku(1), ku(2), ku(3)For each survey voltage coefficient；
N=1~N+2.
When the voltage coefficient is zero, the calculating voltage of short circuit current is voltage rating；
When the voltage coefficient is not zero, calculating voltage=voltage coefficient × nominal voltage of short circuit current.
It should be understood that above-mentioned each technical characteristic of the invention and having in below (eg embodiment) within the scope of the present invention
It can be combined with each other between each technical characteristic of body description, to form a new or preferred technical solution.As space is limited, exist
This no longer tires out one by one states.
Detailed description of the invention
Fig. 1 is the system structure diagram of determination transformer substation system short circuit current of the invention.
Specific embodiment
After extensive and in-depth study, develop a kind of determining transformer substation system short circuit current for the first time is the present inventor
System and method.This method is intended to consider different calculating principles, easily carries out power grid distant view short circuit current level prospect and fast
The carry out calculation of short-circuit current of speed can provide foundation not only for lectotype selection in engineering, but also can be for different regions electricity
The following short circuit current level development is netted, macroscopical Electric Power Network Planning is cooperated, lectotype selection guidance is provided.In bulk power grid, some is paid close attention to
Power grid except substation can be carried out system equivalent, thus simplified mathematical model by the short circuit current level of substation.For by
Common three-winding transformer forms substation, and high-side system equivalent impedance is xs1, and medium voltage side system equivalent impedance is xs2,
Every main transformer high-pressure side, medium voltage side, low-pressure side equivalent impedance be respectively x1 (i), x2 (i), x3 (i), using this model as base
Plinth, the short circuit current level that can carry out electricity grid substation calculate.
Simultaneously when determining transformer substation system short circuit current, to improve accuracy and usability, need to examine in the case of feature
Consider following principle:
Consider foozle: impedance can have error to transformer in the actual production process, in general in -10%~﹢
Between 10%, therefore, the foozle of transformer impedance can have an impact the short circuit current level of substation；
Consider non-standard no-load voltage ratio: when the tap voltage rating and power grid voltage rating of transformer are inconsistent or pressure regulation tap
After head position is adjusted as needed, consider to have an impact the short circuit current level to substation whether non-standard no-load voltage ratio.
The present invention is completed on this basis.
Term
As used herein, term " short circuit current " refers to electric system in operation, sends out between phase and phase or between phase and ground
The electric current flowed through when raw improper connection, value are far longer than rated current.
As used herein, term " non-standard no-load voltage ratio " refers to when the tap voltage rating and power grid voltage rating of transformer are different
After cause or pressure regulation tap joint position are adjusted as needed, the ratio between each side voltage rating of the practical no-load voltage ratio and power grid of transformer is different
When, generate non-standard no-load voltage ratio.
Main advantages of the present invention include:
(a) system and method for determination transformer substation system short circuit current of the invention, in the case where considering different calculating principles,
Energy is convenient, fast and accurately carries out distant view short circuit current prospect and engineering calculation of short-circuit current；
(b) method of determination transformer substation system short circuit current of the invention has good versatility, expansibility and intelligence
It can property；
(c) method of determination transformer substation system short circuit current of the invention, modeling is convenient, and computational efficiency is high.
Determine initial electric parameter that short circuit current need to provide include: main transformer number of units, power grid voltage rating, nominal voltage,
Each main transformer parameter (capacity, practical tap voltage, main transformer impedance etc.), height/medium voltage side system side short circuit current, impedance foozle
Deng；Output content includes: the short circuit current of each voltage class of substation.
Meanwhile to improve calculation of short-circuit current accuracy and applicability, it is contemplated that impedance foozle and non-standard no-load voltage ratio.
Main transformer impedance per unit value (only through overcapacity conversion and meter and impedance error) is calculated according to different input datas,
High, middle side system impedance per unit value, the anti-per unit value of low-pressure side string, non-standard no-load voltage ratio conversion factor and voltage coefficient；
Matrixing is carried out on this basis, forms N platform transformer admittance matrix Y arranged side by side.
Y matrix is defined as follows:
Wherein, i, j=1~2N+2.
According to newest short circuit current result in Y matrix and voltage coefficient calculating.
As a result as follows:
Wherein, n=1~N+2.
Calculated result includes voltage gear, voltage value and the circulation of the pressure regulation side of every main transformer.
The system of determination transformer substation system short circuit current of the invention is provided with result export module, can lead output result
It is used out to excel convenient for directly duplication.
The system of determination transformer substation system short circuit current of the invention is additionally provided with result display module, and calculating structure can be straight
It connects and is shown in result display module.
Present invention will be further explained below with reference to specific examples.It should be understood that these embodiments are merely to illustrate the present invention
Rather than it limits the scope of the invention.
It should be noted that in the claim and specification of this patent, such as first and second or the like relationship
Term is only used to distinguish one entity or operation from another entity or operation, without necessarily requiring or implying
There are any actual relationship or orders between these entities or operation.Moreover, the terms "include", "comprise" or its
Any other variant is intended to non-exclusive inclusion so that include the process, methods of a series of elements, article or
Person's equipment not only includes those elements, but also including other elements that are not explicitly listed, or further includes for this mistake
Journey, method, article or the intrinsic element of equipment.In the absence of more restrictions, being limited by sentence " including one "
Element, it is not excluded that there is also other identical elements in the process, method, article or apparatus that includes the element.
Embodiment 1
As shown in Figure 1, the system of determination transformer substation system short circuit current of the invention includes: that initial electric parameter provides mould
Block, for providing the initial electric parameter of transformer substation system；Data preprocessing module, for being provided from the initial electric parameter
Module obtains the initial electric parameter, and pre-processes to the initial electric parameter, calculates standard reduced value；Matrix meter
Module is calculated, matrixing processing is carried out for the standard reduced value to the data preprocessing module, to obtain admittance matrix；Accidentally
Poor coefficients calculation block calculates short circuit electricity for calculating the voltage coefficient of the transformer substation system, and in conjunction with the admittance matrix
Stream and result export module, for exporting the calculation of short-circuit current result of the error coefficient computing module, visually
Change ground and calculated result is presented；Wherein, the initial electric parameter provides module and connect with the data preprocessing module, the number
Data preprocess module is connect with the matrix computing module, the error coefficient computing module and the matrix computing module and
The result export module connection.The system considers impedance foozle, non-standard no-load voltage ratio and the anti-data of low pressure lateral confinement, tool
Standby higher accuracy and applicability.
Embodiment 2
Engineering feasibility study-impedance type selecting
Somewhere 500kV substation four main transformers of status, wherein #1, #2 main transformer capacity are 750MVA；#3, #4 main transformer hold
Amount is 1000MVA, this engineering project transform #1, #2 main transformer as 2 × 1200MVA, and each main transformer parameter is as follows:
#1, #2 main transformer: it is 14% that senior middle school/height/medium or low resistance, which resists,；
#3, #4 main transformer: high middle impedance is 16%；
This engineering replaces one of an important factor for high middle impedance of main transformer is chosen as the station short circuit current level, is advised according to power grid
It draws, rack variation in two years is smaller, and short circuit current level is close.
Therefore, it is the prospect zone for meeting engineering proposal, distant view short circuit current level need to be looked forward to, look forward to the change
Power station 500kV busbar short-circuit electric current reaches 60kA, calculates station 220kV busbar short-circuit electric current, while according to the power transformation
220kV subregion installation scale, the short circuit current that main transformer medium voltage side system provides are estimated by 7.5kA where standing.
It is calculated using the short circuit current of method of the invention to different high middle impedances, considers non-standard no-load voltage ratio, as a result
Such as table 1, according to calculated result, this engineering replaces the high middle impedance selection 22% of main transformer, if station distant view 4 × 1200MVA of scale,
The side 220kV short circuit current can be controlled in 48kA or less；If the station 2 × 1200+2 of distant view scale × 1000MVA, can incite somebody to action
Short circuit current control in the side 220kV is in 48kA hereinafter, comprehensively considering power network development uncertainty and prospect zone, it is proposed that this engineering
It replaces the high middle impedance of main transformer and chooses 22%.
Certain station distant view three short circuit current (unit kA) of table 1
Embodiment 3
The research of somewhere 1000MVA main transformer low-pressure side short circuit current and impedance, which are chosen, to be suggested
As Power grid structure is increasingly close, power supply increases, the short circuit current level of power grid is caused to increase, 1000MVA
Important component of the transformer as power grid, impedance type selecting can generate shadow to grid short circuit levels of current, space truss project
It rings.
The common modular design impedance of 1000MVA main transformer at present have two groups: 18%/58%/38% and 20%/62%/
40%, using method of the invention, consider the gradually development of power grid, high-pressure side, medium voltage side short circuit current level are adjusted to far
The level of scape 60kA, 48kA record low-pressure side short circuit current level, as shown in table 2 under different calculating principles.According to calculating
Results, it can be seen that 20%/62%/40% main transformer, reaches higher in high-pressure side, medium voltage side distant view short circuit current level
Level under the premise of, consider that different calculating principles, low-pressure side maximum short circuit current do not exceed 40kA still, therefore, for meet
The development of area power grid distant view, lectotype selection unification, it is proposed that the impedance of newly-built 1000MVA main transformer is examined by 20%/62%/40%
Consider.
Low-pressure side short circuit current level (unit kA) under the different calculating principle of table 2
To sum up, by calculating, the method for method of the invention compared with prior art, calculated result is more accurate, calculates
Process is more simplified efficiently, has good directive significance for sorts of systems conceptual design, decision in practical projects.
All references mentioned in the present invention is incorporated herein by reference, independent just as each document
It is incorporated as with reference to such.In addition, it should also be understood that, after reading the above teachings of the present invention, those skilled in the art can
To make various changes or modifications to the present invention, such equivalent forms equally fall within model defined by the application the appended claims
It encloses.
Claims (10)
1. a kind of system of determining transformer substation system short circuit current, which is characterized in that the system comprises
Initial electric parameter provides module, for providing the initial electric parameter of transformer substation system；
Data preprocessing module obtains the initial electric parameter for providing module from the initial electric parameter, and to institute
It states initial electric parameter to be pre-processed, calculates standard reduced value；
Matrix computing module carries out matrixing processing for the standard reduced value to the data preprocessing module, to obtain
Admittance matrix；
Error coefficient computing module is calculated for calculating the voltage coefficient of the transformer substation system, and in conjunction with the admittance matrix
Short circuit current；And
As a result export module, for the calculation of short-circuit current result of the error coefficient computing module to be exported, visualization
Calculated result is presented in ground；
Wherein, the initial electric parameter provides module and connect with the data preprocessing module, the data preprocessing module
It is connect with the matrix computing module, the error coefficient computing module and the matrix computing module and the result export
Module connection.
2. the system as claimed in claim 1, which is characterized in that the system also includes control systems；
Preferably, the control system is connect with transformer substation system；
Preferably, the control system is connect with the result export module；
Preferably, the initial electric parameter provides module and connect with transformer substation system.
3. the system as claimed in claim 1, which is characterized in that it further includes that data are manual that the initial electric parameter, which provides module,
Input module；
Preferably, the system also includes result display modules；
Preferably, the result display module is display；
Preferably, the result export module is connect with result display module.
4. a kind of method of determining transformer substation system short circuit current, which is characterized in that the described method comprises the following steps:
(a) transformer substation system is provided, the initial electric parameter of the system is obtained；The initial electric parameter includes main transformer platform
Number, power grid voltage rating, nominal voltage, capacity, practical tap voltage, main transformer impedance and height/medium voltage side system side short circuit electricity
Stream；
(b) the initial electric parameter is pre-processed, calculates standard reduced value；
(c) matrixing processing is carried out to the standard reduced value, obtains N platform transformer admittance matrix Y arranged side by side；
(d) voltage coefficient of the transformer substation system is calculated by the initial electric parameter；And
(e) the short circuit current result of the transformer substation system is calculated by the admittance matrix Y and the voltage coefficient.
5. method as claimed in claim 4, which is characterized in that the standard reduced value include: main transformer impedance per unit value, height,
Medium voltage side system impedance per unit value and the anti-per unit value of low-pressure side string.
6. method as claimed in claim 4, which is characterized in that the standard reduced value further includes non-standard no-load voltage ratio conversion system
Number.
7. method as claimed in claim 4, which is characterized in that each element Y in the admittance matrix YijIt is defined as follows:
Wherein, i, j=1~2N+2；
N is transformer number of units；
x(s1)For high-side system impedance per unit value；
x(s2)For medium voltage side system impedance per unit value；
xcn*For the anti-per unit value of low-pressure side string；
x(1)n*, x(2)n*, x(3)n*For main impedance per unit value；
k(1)n, k(2)n, k(3)nFor non-standard no-load voltage ratio conversion factor；
N=1~N+2.
8. method as claimed in claim 4, which is characterized in that the short circuit current result is by InIt indicates:
Wherein, ku(1), ku(2), ku(3)For each survey voltage coefficient；
N=1~N+2.
9. method as claimed in claim 4, which is characterized in that when the voltage coefficient is zero, the calculating electricity of short circuit current
Pressure is voltage rating.
10. method as claimed in claim 4, which is characterized in that when the voltage coefficient is not zero, the calculating of short circuit current
Voltage=voltage coefficient × nominal voltage.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112924755A (en) * | 2020-12-30 | 2021-06-08 | 广东电网有限责任公司电力科学研究院 | Transformer monitoring method and device based on short-circuit current and storage medium |
| CN113659571A (en) * | 2021-08-13 | 2021-11-16 | 云南电网有限责任公司电力科学研究院 | Prediction device and method for predicting short-circuit current of power grid in-operation transformer in real time |
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| CN206906465U (en) * | 2017-07-14 | 2018-01-19 | 中国电力工程顾问集团华东电力设计院有限公司 | A kind of system for determining transformer substation system short circuit current |
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| CN112924755A (en) * | 2020-12-30 | 2021-06-08 | 广东电网有限责任公司电力科学研究院 | Transformer monitoring method and device based on short-circuit current and storage medium |
| CN112924755B (en) * | 2020-12-30 | 2022-03-04 | 广东电网有限责任公司电力科学研究院 | Transformer monitoring method and device based on short-circuit current and storage medium |
| CN113659571A (en) * | 2021-08-13 | 2021-11-16 | 云南电网有限责任公司电力科学研究院 | Prediction device and method for predicting short-circuit current of power grid in-operation transformer in real time |
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