TWI617108B - Judgment system for transformer operation status in power supply network - Google Patents

Judgment system for transformer operation status in power supply network Download PDF

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Publication number
TWI617108B
TWI617108B TW105140610A TW105140610A TWI617108B TW I617108 B TWI617108 B TW I617108B TW 105140610 A TW105140610 A TW 105140610A TW 105140610 A TW105140610 A TW 105140610A TW I617108 B TWI617108 B TW I617108B
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Taiwan
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data
power
value
refining
transformer
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TW105140610A
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Chinese (zh)
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TW201822434A (en
Inventor
Ming-Yuan Zhuo
Jun-Lian Su
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Publication of TW201822434A publication Critical patent/TW201822434A/en

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Abstract

The invention relates to a system for judging the operation state of a transformer in a power supply network, and the rough estimation of the load is mainly based on the power consumption data of the user terminal. According to the result of the rough estimation, the refinement estimation is performed by state estimation to improve the overall estimation accuracy, and then the state of the processor is judged according to the result of the final estimation, so that the operator can perform corresponding processing. means. Therefore, this case can effectively reduce the load survey measurement cost, and at the same time urgently deal with the problematic transformer to improve the power supply security of the power supply network.

Description

Judgment system for transformer operation status in power supply network
The invention relates to a fault judgment system, in particular to a judgment system for the operation state of a transformer in a power supply network.
According to, protecting the assets of power companies to ensure investment recovery is the goal pursued by each power company. Due to the large number of transformers and an important part of the power supply network, optimizing the utilization and service life of transformer assets is one of the essential tasks for every power company. At present, many power companies are facing the aging of power equipment. In terms of transformers, the average life expectancy is about 37 years and up to 40 years. According to the statistics of Taipower Company, by the end of September, the distribution system had about 470,437 transformers on the feeder line, about 1980 underground transformers, and about 806,448 transformers on the pole, totaling about 1.28 million sets, and secondary transformers. It accounts for the largest part of the power company's assets.
Because the transformer will be affected by the aging and damage of the internal components, the voltage conversion efficiency will be reduced, and the power supply will be lost. In order to maintain a large number of transformers, the power company must monitor the transformer to increase the reliability of the power supply and plan. And maintenance, but also can be used for transformer replacement time planning. However, for the monitoring of transformers, most power companies currently require on-site maintenance personnel to check the transformer for abnormal operation every year or at a fixed period. This traditional asset management method not only wastes time, is inefficient, and cannot detect abnormal transformers in real time. Furthermore, the aging of the internal components of the transformer cannot be known through the general piping or appearance.
Therefore, in view of the above problems, the creator of the present invention believes that there should be a means to know whether the transformer is aging, damaged, or faulty, etc., not only to ensure the power quality and safety of the power supply system, but also to reduce the power company. The cost of repair and maintenance.
In view of the deficiencies described in the prior art, the creator of the present invention proposes a solution for a judgment system for a transformer operating condition in a power supply network, comprising: a complex detector: the complex detector is available for detection The power consumption of each load in the power supply network is measured to obtain a plurality of power consumption data.
a database: the database includes a transformer average loss data, an average power factor data, a measured value function constant matrix, a measured value mutual variance matrix, a bus injection power and a system state solution function data, and a System admittance matrix data.
An alarm system.
a processor: the processor is electrically connected to each detector, the database, and the alarm system, wherein the processor writes a first bus flow power calculation program, a second bus flow power calculation program, and a third The sink power calculation program, a state estimation program, and a judgment program.
The first bus flow power calculation program is executable by the processor: calculating a real power rough estimation data of the transformer according to the plurality of power consumption data and the average loss data of the transformer, and the processor further estimates the data according to the real power, And the average power factor data calculates a virtual power rough estimate of a transformer.
The second bus flow power calculation program is executable by the processor: setting a voltage phase angle initial value data of a bus bar, and a voltage initial value data of a bus bar, according to the complex power consumption data, the voltage phase angle initial The value data, the initial value data of the voltage, and the constant matrix of the measured value function calculate a matrix of measured values.
The state estimation program is executable by the processor: performing state estimation according to the measured value matrix, the measured value mutual variance matrix, the real power rough estimation data, the virtual power rough estimation data, and the function data, when the state estimation result When the data is not converged, the voltage phase angle initial value data and the voltage initial value data are iteratively re-executed to execute the second bus flow power calculation program and the state estimation program; When the result of the state estimation is convergence, a voltage phase angle refining value data and a voltage refining value data are obtained.
The third bus flow power calculation program is executable by the processor: calculating, according to the voltage phase angle refining value data, the voltage refining value data, and the system admittance matrix data, a real power refining data, and a Virtual power refining data.
The determining program is executable by the processor: when the value represented by the real power refining data is greater than a real power overload preset value, and the value represented by the virtual power refining data is greater than a virtual power overload preset value, or When the value represented by the real power refining data is greater than a real power fault preset value, and the value represented by the virtual power refining data is greater than a virtual power fault preset value, the processor controls the alarm system to operate.
The invention is mainly aimed at improving economic efficiency and improving the efficiency of power supply network transformer management, making full use of the smart meter information of the downstream power supply user terminal of the transformer, the rough estimation of the load during the same period of the transformer, and the second stage of refining estimation. Estimate, in order to improve the accuracy of the overall estimate, and through the results of the estimate, can determine whether the transformer is overloaded or damaged. Therefore, this case can effectively reduce the load survey measurement cost, and at the same time urgently deal with the problematic transformer to improve the power supply security of the power supply network.
(A) ‧ ‧ judgment system
(1) ‧‧‧multiple detectors
(2) ‧ ‧ database
(3) ‧‧‧Human Machine Interface Unit
(4) ‧‧‧Alarm system
(5) ‧‧‧ processor
The first figure is a schematic diagram of the connection of each component of the creation of the present invention.
The construction, features and embodiments of the present invention will be described with the aid of the drawings, and the reviewers will have a better understanding of the present invention.
Referring to the first figure, the invention relates to a system for judging the running condition of a transformer in a power supply network, the judging system comprising: a complex detector (1): Please refer to the first figure, the complex detector (1) It is available to detect the power consumption of each load in the power supply network, and obtain multiple power consumption data ( For example, the detector (1) is preferably a smart meter for household use.
A database (2): Please refer to the first figure, the database (2) includes a transformer average loss data ( ), an average power factor data (pf i,k ), a measured value function constant matrix, a measured value mutual variance matrix ([R]), a bus injection power and a system state solution function data (f i ( x)), and a system admittance matrix data. Where k represents a point in time.
One-machine interface unit (3): Please refer to the first figure, the human-machine interface unit (3) can present various judgment results of the judgment system (A), various data or settings, etc., through visualization Presented so that the operator can understand the operation status of each transformer or set the parameters of the system.
An alarm system (4): As shown in the first figure, the alarm system (4) is electrically connected to the human interface unit (3), and can be used to sound or alert once the alarm system (4) is activated. The method reminds the power supply system (A) that there is a problem with the transformer. Taking the creation of the present invention as an example, the alarm system (4) can provide the human-machine interface unit (3) with a pattern of a transformer and change the transformer pattern. The color indicates the state of the transformer.
a processor (5): as shown in the first figure, the processor (5) is electrically connected to each detector (1), the database (2), the human interface unit (3), and The alarm system (4), the processor (5) respectively writes a first bus flow power calculation program, a second bus flow power calculation program, a third bus flow power calculation program, a state estimation program, and A judgment program.
The following is a one-to-one introduction to the operation of each program: First, the invention creates a mathematical relationship between the secondary measurement load of the transformer and the power consumption of each downstream user of the bus, and first obtains the injection power on the secondary measurement bus of the transformer. . At any point in time, the sum of the injected power of each bus must conform to the power balance equation, that is, the power measurement of the transformer is equal to the sum of the injected power of each bus, plus the line loss. The first bus flow power calculation program mainly provides a real power rough estimate of the transformer at a time point k, and a virtual power rough estimate, and thus, the first bus flow power calculation program is available to the processor ( 5) Execution: based on the plural electrical data ( ), the average loss data of the transformer ( ) Calculate the actual power rough estimate of a transformer based on And then the processor (5) further estimates the data based on the real power ( ) and the average power factor data (pf i,k ) Calculate the virtual power rough estimate of a transformer based on ).
In the above rough estimation stage, the judging system (A) has obtained the power injection amount of all the bus bars in the power supply network, and in order to improve the above-mentioned real power rough estimation data and the accuracy of the virtual power rough estimation data, the judging system utilization state Estimating means to improve the accuracy of the real power rough estimate and the virtual power rough estimate. First of all, the creation of the invention preferably establishes a measurement error matrix and a mathematical model of a Jacobian matrix, and then uses the calculation of Weighting Least Square (WLS) to determine the voltage of each bus of the system. Size and angle.
In order to achieve the above purpose, the second bus flow power calculation program is executable by the processor (5): setting a voltage phase angle initial value data (θ i ) of a bus bar, and a voltage initial value data of a bus bar (E i ), based on the plural electrical data ( The voltage phase angle initial value data (θ i ), the voltage initial value data (E i ), and the measured value function constant matrix calculate a measured value matrix data ([H]). Wherein, the measured value function constant matrix can be expressed as: .
Then, the state estimation program is executable by the processor (5): according to the measured value matrix data ([H]), the measured value mutual variance number matrix ([R]), the real power rough estimate data ( ), the virtual power rough estimate data ( ) and the function data (f i (x)) Based on the state estimation, when the result of the state estimation is the end convergence, the voltage phase angle initial value data (θ i ) and the voltage initial value data (E i ) are iteratively performed to re-execute the second sink. The drain power calculation program and the state estimation program; when the result of the state estimation is convergence, a voltage phase angle refining value data and a voltage refining value data are obtained.
The matrix of mutual values of the measured values can be expressed as: ,among them Is the variance of the i-th measured value.
Then, the third bus flow power calculation program is executable by the processor (5): performing operation according to the voltage phase angle refining value data, the voltage refining value data, and the admittance matrix respectively = Based on a real power refining data ( ), and a virtual power refining data ( ).
The main process of the judgment system of the present invention is to first set calculation related parameters, including transformer load power factor, system line loss, etc., in the rough estimation stage, and then read the user's injected power measurement value, and through the sink flow The power calculation program is used to calculate the rough estimate of the injected real power and virtual power of the transformer bus. In the accurate estimation stage, the measured value of the injected power of each user bus and the rough estimate of the injected power of the transformer are measured data, and the state variables of each bus are recursively solved by the state estimation program. Finally, the convergence result can be used to obtain the real power and virtual power injection amount of all the bus bars of the system with the third bus flow power calculation program. Then, based on the final calculation result of the injection power of the transformer bus, the effective human-machine interface technology can be used for load monitoring and management.
Finally, the determining program is executable by the processor (5): when the value represented by the real power refining data is greater than a real power overload preset value, and the value represented by the virtual power refining data is greater than a virtual power overload preloading When the value is set, or the value represented by the real power refining data is greater than a real power fault preset value, and the value represented by the virtual power refining data is greater than a virtual power fault preset value, the processor (5) Control the alarm system (4) to operate. Taking the creation of the present invention as an example, when the value represented by the real power refining data is greater than a real power overload preset value, and the value represented by the virtual power refining data is greater than a virtual power overload preset value, it indicates that the transformer has The overload causes the human interface unit (3) to display a first warning pattern. When the value represented by the real power refining data is greater than a real power fault preset value, and the value represented by the virtual power refining data is greater than a virtual power fault preset value, the alarm system ( 4) A second warning pattern can be displayed for the human interface unit (3). The first warning pattern and the second warning pattern can be presented in different color transformer patterns. In addition, the creation of the present invention can also present transformer patterns of different colors in the human-machine interface unit (3) according to the load condition of the transformer.
The invention is mainly aimed at improving economic efficiency and improving the efficiency of power supply network transformer management, making full use of the smart meter information of the downstream power supply user terminal of the transformer, the rough estimation of the load during the same period of the transformer, and the second stage of refining estimation. Estimate, in order to improve the accuracy of the overall estimate, and through the results of the estimate, can determine whether the transformer is overloaded or damaged. Therefore, this case can effectively reduce the load survey measurement cost, and at the same time urgently deal with the problematic transformer to improve the power supply security of the power supply network.
In order to enable the operator to understand the historical load status of the transformers of the power supply system, the invention can be further implemented by: the processor (5) writing a storage program, the storage program being executable by the processor (5): storing The real power refining data and the virtual power refining data obtain a power history data; the human machine interface unit (3) is configured to display the power history data.
In summary, the creation of the present invention is indeed in line with the industrial applicability, and is not found in the publication or public use before the application, nor is it known to the public, and has non-obvious knowledge, conforms to the patentable requirements, and is patented according to law. Application.
However, the above-mentioned statements are a preferred embodiment of the invention in the creation of the invention, and all the changes in the scope of the patent application according to the invention are within the scope of the claim.

Claims (4)

  1. A judging system for operating conditions of a transformer in a power supply network, comprising: a plurality of detectors for detecting the amount of electricity used by each load in the power supply network to obtain a plurality of power consumption data; and a database comprising: a transformer average loss data, Average power factor data, a measured value function constant matrix, a measured value mutual variance matrix, a bus injection power and system state solution function data, and a system admittance matrix data; an alarm system; a processor: electricity The detectors are connected to the detector, the database, and the alarm system. The processor writes a first bus flow power calculation program, a second bus flow power calculation program, and a third bus flow power calculation program. a state estimation program and a determination program; the first bus flow power calculation program is executable by the processor: calculating a real power rough estimation data of the transformer according to the plurality of power consumption data and the average loss data of the transformer, the processing And calculating a virtual power rough estimate data of the transformer according to the real power rough estimate data and the average power factor data; the second bus flow The rate calculation program is executable by the processor: setting a voltage phase angle initial value data of a bus, and a voltage initial value data of the bus, according to the plurality of power data, the voltage phase angle initial value data, the voltage initial The value data and the measured value function constant matrix calculate a measured value matrix data; the state estimation program is executable by the processor: according to the measured value matrix, the measured value mutual variance matrix, the real power rough estimate data, the The virtual power rough estimation data and the function data are used for state estimation. When the result of the state estimation is not converged, the voltage phase angle initial value data and the voltage initial value data are iteratively re-executed to execute the second row. a flow power calculation program and the state estimation program; when the result of the state estimation is convergence, a voltage phase angle refining value data and a voltage refining value data are obtained; The third bus flow power calculation program is executable by the processor: calculating, according to the voltage phase angle refining value data, the voltage refining value data, and the system admittance matrix data, a real power refining data, and a Virtual power refining data; the judging program is executable by the processor: when the value represented by the real power refining data is greater than a real power overload preset value, and the value represented by the virtual power refining data is greater than a virtual power overload preload When the value is set, or the value represented by the real power refining data is greater than a real power fault preset value, and the value represented by the virtual power refining data is greater than a virtual power fault preset value, the processor controls the alarm. System action.
  2. For example, in the judgment system of the operation state of the transformer in the power supply network according to the first aspect of the patent application, a human-machine interface unit electrically connected to the processor is further provided, and the human-machine interface unit is configured to display the real power refining data, and The virtual power refines the data.
  3. The system for judging the operating condition of a transformer in a power supply network according to the first or second aspect of the patent application, wherein the alarm system is electrically connected to the human-machine interface unit, and the value represented by the real-power refining data is greater than a real power. When the preset value is overloaded, and the value represented by the virtual power refining data is greater than a virtual power overload preset value, the alarm system is configured to display a first warning pattern on the human interface unit; the real power refining data represents The alarm system is configured to display a second warning pattern for the human interface unit when the value of the virtual power refinement data is greater than a virtual power failure preset value.
  4. The system for determining the operating condition of a transformer in a power supply network according to claim 3, wherein the processor writes a storage program executable by the processor: storing the real power refining data, and the virtual power refining The data is obtained by a data history data unit; the human-machine interface unit is configured to display the power history data.
TW105140610A 2016-12-08 2016-12-08 Judgment system for transformer operation status in power supply network TWI617108B (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103398769B (en) * 2013-08-05 2014-12-31 国家电网公司 Transformer on-line fault detecting method based on sampling integrated SVM (support vector machine) under wavelet GGD (general Gaussian distribution) feather and unbalanced K-mean value
CN204228368U (en) * 2014-10-29 2015-03-25 云南电网公司电力科学研究院 A kind of transformer on-line fault diagnosis pick-up unit
CN204578211U (en) * 2015-02-11 2015-08-19 广东梅雁吉祥水电股份有限公司 The system that a kind of transformer presence detects
CN102866377B (en) * 2012-09-17 2016-03-09 中国电力科学研究院 The detection check system and method for the online monitoring assembly of transformer partial discharge and location
CN205210176U (en) * 2015-12-08 2016-05-04 哈尔滨瑞兴变压器制造有限公司 Transformer detection device
CN104280071B (en) * 2014-10-16 2016-07-06 国家电网公司 A kind of fault detection method of oil-immersed power transformer accident warning device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102866377B (en) * 2012-09-17 2016-03-09 中国电力科学研究院 The detection check system and method for the online monitoring assembly of transformer partial discharge and location
CN103398769B (en) * 2013-08-05 2014-12-31 国家电网公司 Transformer on-line fault detecting method based on sampling integrated SVM (support vector machine) under wavelet GGD (general Gaussian distribution) feather and unbalanced K-mean value
CN104280071B (en) * 2014-10-16 2016-07-06 国家电网公司 A kind of fault detection method of oil-immersed power transformer accident warning device
CN204228368U (en) * 2014-10-29 2015-03-25 云南电网公司电力科学研究院 A kind of transformer on-line fault diagnosis pick-up unit
CN204578211U (en) * 2015-02-11 2015-08-19 广东梅雁吉祥水电股份有限公司 The system that a kind of transformer presence detects
CN205210176U (en) * 2015-12-08 2016-05-04 哈尔滨瑞兴变压器制造有限公司 Transformer detection device

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