CN112230117B - Fault on-line detection system and method for rotating diode of AP1000 bar power unit - Google Patents
Fault on-line detection system and method for rotating diode of AP1000 bar power unit Download PDFInfo
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- CN112230117B CN112230117B CN202011095432.7A CN202011095432A CN112230117B CN 112230117 B CN112230117 B CN 112230117B CN 202011095432 A CN202011095432 A CN 202011095432A CN 112230117 B CN112230117 B CN 112230117B
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- 238000004088 simulation Methods 0.000 description 4
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/26—Testing of individual semiconductor devices
- G01R31/2607—Circuits therefor
- G01R31/2632—Circuits therefor for testing diodes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/16—Spectrum analysis; Fourier analysis
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/54—Testing for continuity
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- Control Of Eletrric Generators (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The application relates to the technical field of overhaul of an AP1000 nuclear power station rod power supply unit, in particular to a fault on-line detection system and method for a rotating diode of the AP1000 rod power supply unit. The fault on-line detection system for the rotating diode of the AP1000 rod power supply unit comprises exciting current acquisition equipment, a control unit and a control unit, wherein the exciting current acquisition equipment is used for acquiring exciting current of the AP1000 rod power supply unit; the excitation current analysis platform is used for acquiring the harmonic content of the collected excitation current; the harmonic content fault comparison module comprises a harmonic content fault comparison table for judging whether faults exist in the rotating diode of the AP1000 bar power supply unit or not and specific fault types according to the obtained harmonic content. The system and the method can realize the online fault detection of the rotating diode of the rod power supply unit by measuring the exciting current of the rod power supply unit of the AP1000 nuclear power station and analyzing the harmonic content of the exciting current on the premise of not affecting the stable operation of the rod power supply unit and not changing the structure of the rod power supply unit, thereby ensuring the power supply reliability of the control rod of the AP1000 unit.
Description
Technical Field
The application relates to the technical field of overhaul of an AP1000 nuclear power station rod power supply unit, in particular to a fault on-line detection system and method for a rotating diode of the AP1000 rod power supply unit.
Background
As key sensitive equipment of a nuclear power station which runs for a long time, the rotating diode of the AP1000 rod power unit is required to bear mechanical working conditions such as large centrifugal force, large vibration, dust accumulation and the like besides bearing electric working conditions such as large current, frequent turn-off times and the like, and certain fault possibility exists. But the rotating diode of the rod power unit of the AP1000 nuclear power station has no online detection technology.
The fault detection method of the rotating diode of the rod power unit of the AP1000 nuclear power station at present is to disassemble an exciter end cover after shutdown, and the on-off of the diodes is measured one by one. The AP1000 nuclear power station rod power supply unit is stopped once every 18 months, and whether the rotating diode has faults or not is checked every 54 months, so that the current detection method obviously has no timeliness.
At present, a large-sized brushless excitation generator set can monitor the state of a rotating diode by adopting a diode non-conduction detection system, but because the structure of an AP1000 nuclear power station bar power unit generator is greatly different from that of the brushless excitation generator set generator and the influence of the rotating diode fault on exciting current and terminal voltage is different, the fault of the rotating diode of the AP1000 bar power unit cannot be detected by adopting the existing diode non-conduction detection system.
Disclosure of Invention
Aiming at the problems existing in the prior art, the application provides a fault online detection system and method for the rotating diode of the AP1000 bar power unit, which can online detect whether the diode has faults or not during the operation of the bar power unit, and effectively improve the fault detection efficiency and convenience of the rotating diode.
The technical scheme adopted for solving the technical problems is as follows: a fault on-line detection system for an AP1000 bar power unit rotating diode comprises
The excitation current acquisition equipment is used for acquiring excitation current of the AP1000 rod power supply unit;
the excitation current analysis platform is used for acquiring the harmonic content of the collected excitation current;
the harmonic content fault comparison module comprises a harmonic content fault comparison table for judging whether faults exist in the rotating diode of the AP1000 bar power supply unit or not and specific fault types according to the obtained harmonic content.
The system can detect whether the rotating diode has faults or not on line during the running of the bar power unit, and effectively improves the fault detection efficiency and convenience of the rotating diode.
Preferably, the harmonic content fault control module further comprises
The modeling parameter acquisition unit is used for acquiring modeling parameters of the generator and the exciter of the AP1000 rod power unit;
the modeling platform is used for establishing a generator model and an exciter model of the AP1000 rod power supply unit according to modeling parameters;
the diode fault analysis platform is used for importing a generator model and an exciter model, simulating normal operation and various fault states of the rotating diode of the AP1000 rod power supply unit, and obtaining harmonic content of exciting current corresponding to the normal operation and various fault states of the rotating diode of the AP1000 rod power supply unit to form a harmonic content fault comparison table.
Preferably, the harmonic content fault control module further comprises
And the model verification unit is used for verifying the correctness of the generator model and the exciter model.
Preferably, the modeling platform comprises a MAXWELL software platform.
Preferably, the diode fault analysis platform comprises a simple software platform.
A fault on-line detection method for a rotating diode of an AP1000 bar power unit comprises the following steps of
S01, collecting exciting current of the AP1000 rod power supply unit in an on-line state through exciting current collecting equipment;
s02, acquiring the harmonic content of the collected exciting current through an exciting current analysis platform;
s03, judging whether faults exist in the rotating diode of the AP1000 bar power supply unit and the types of the faults according to the obtained harmonic content and by combining a harmonic content fault comparison table.
According to the method, the harmonic content of the excitation current of the rod power supply unit of the AP1000 nuclear power station can be analyzed by measuring the excitation current, so that the purpose of online detection of the fault of the rotating diode during the operation of the rod power supply unit is achieved.
Preferably, the harmonic content fault comparison table in S03 is obtained by the following steps,
s31, acquiring modeling parameters of an AP1000 rod power supply unit generator and an exciter by a modeling parameter acquisition unit;
s32, establishing a generator model and an exciter model of the AP1000 rod power supply unit on a modeling platform according to modeling parameters;
s33, the generator model and the exciter model are led into a diode fault analysis platform, normal operation and various fault states of the rotating diode of the AP1000 rod power supply unit are simulated through the diode fault analysis platform, and harmonic content of exciting current corresponding to the normal operation and various fault states of the rotating diode of the AP1000 rod power supply unit is obtained to form a harmonic content fault comparison table.
Preferably, the step S32 further includes verifying the correctness of the generator model and the exciter model by a model verification unit.
Preferably, the harmonic content fault comparison table specifically comprises,
when the rotating diode normally operates, 6 harmonic contents in the first 6 harmonic waves far exceed other harmonic contents;
when a single rotating diode is opened, the fundamental wave content in the first 6 harmonics is larger than the 2-order harmonic content, and the 2-order harmonic content far exceeds the other harmonic content;
when two rotating diodes in the same phase are open, the 2 nd harmonic content in the first 6 th harmonic is far more than the other harmonic content;
when two rotating diodes of different phases are open, the fundamental wave content in the first 6 harmonics is far higher than the other harmonic contents.
Preferably, the sampling frequency of the exciting current collecting device is greater than 1000Hz.
Advantageous effects
The system and the method can realize the fault on-line detection of the rotating diode of the rod power supply unit by measuring the exciting current of the rod power supply unit of the AP1000 nuclear power station and analyzing the harmonic content of the exciting current on the premise of not affecting the stable operation of the rod power supply unit and not changing the structure of the rod power supply unit, thereby improving the operation stability of the rod power supply unit and ensuring the power supply reliability of the control rod of the AP1000 unit.
Drawings
FIG. 1 is a schematic diagram of harmonic distribution in excitation current during normal operation of a stick power supply of the present application;
FIG. 2 is a schematic diagram of harmonic distribution in excitation current after a single diode of a bar power supply of the application is opened;
FIG. 3 is a schematic diagram of harmonic distribution in excitation current after two diodes of the same phase of the bar power supply are open circuit;
FIG. 4 is a schematic diagram of harmonic distribution in excitation current after two diodes of different phases of a bar power supply are opened.
Detailed Description
The technical scheme of the application is further described below by the specific embodiments with reference to the accompanying drawings.
A fault on-line detection system for a rotating diode of an AP1000 bar power unit comprises exciting current acquisition equipment, an exciting current analysis platform and a harmonic content fault comparison module.
The excitation current acquisition equipment is used for acquiring excitation current of the AP1000 rod power supply unit, and the excitation current analysis platform is used for acquiring harmonic content of the acquired excitation current. The harmonic content fault comparison module comprises a harmonic content fault comparison table for judging whether faults exist in the rotating diode of the AP1000 bar power supply unit or not and specific fault types according to the obtained harmonic content. The system can detect whether the rotating diode has faults or not on line during the running of the bar power unit, and effectively improves the fault detection efficiency and convenience of the rotating diode.
The harmonic content fault comparison module further comprises a modeling parameter acquisition unit, a modeling platform and a diode fault analysis platform. The modeling parameter acquisition unit is used for acquiring modeling parameters of the generator and the exciter of the AP1000 rod power unit. The modeling platform is used for establishing a generator model and an exciter model of the AP1000 rod power unit according to modeling parameters. The modeling platform includes a MAXWELL software platform. The diode fault analysis platform is used for importing a generator model and an exciter model, simulating normal operation and various fault states of the rotating diode of the AP1000 rod power supply unit, and obtaining harmonic content of exciting current corresponding to the normal operation and various fault states of the rotating diode of the AP1000 rod power supply unit so as to form a harmonic content fault comparison table. The diode fault analysis platform comprises a simple software platform.
As the technology for performing the rotating diode fault simulation test on the rod power supply unit of the AP1000 nuclear power station is not available currently. Thus, the present application relies primarily on the joint simulation of MAXWELL software and SIMPLORER software. By measuring all parameters of a generator and an exciter of a rod power supply unit of an AP1000 nuclear power station on site, an exciter and generator model corresponding to the actual ratio is established in MAXWELL software, the model is imported into SIMPLORER software, and the harmonic influence of diode faults on exciting currents of the exciter is simulated.
The harmonic content fault control module further comprises a model verification unit for verifying the correctness of the generator model and the exciter model. Simulation of the excitation current during normal operation of the bar power unit in the simple software can be given as follows: the excitation current during normal operation contains mainly 6 th order harmonics. The actual running current of the acquisition rod power supply unit is analyzed, and the following steps are obtained: the excitation current during normal operation contains mainly 6 th order harmonics. The two analysis results are consistent, and the correctness of the establishment of the AP1000 rod power supply unit model can be proved.
According to the simulation model, tripping of the unit is obtained after the rotating diode of the AP1000 nuclear power station rod power unit is short-circuited, and the method is mainly used for analyzing harmonic content distribution conditions in exciting currents after the 1 and 2 diodes of the AP1000 nuclear power station rod power unit are most likely to be open so as to realize online detection of faults of the rotating diode of the AP1000 nuclear power station rod power unit.
As shown in fig. 1, during normal operation of the rotating diode: mainly contains the first 6 harmonics, wherein the 6 harmonics content far exceeds the other harmonics content. As shown in fig. 2, when a single diode of the rotating diode is open: mainly contains the first 6 harmonics, wherein the fundamental wave and the 2 harmonics far exceed the 6-order harmonic content. As shown in fig. 3, the same phase two diodes of the rotating diode are open: mainly comprises 2, 4 and 6 harmonics, wherein the 2-harmonic content exceeds the 4-harmonic and the 6-harmonic. As shown in fig. 4, when two diodes of different phases of the rotating diode are open: mainly contains the first 6 harmonics, wherein the fundamental wave exceeds the 6-harmonic content, and the 2-harmonic is approximately equal to the 6-harmonic.
The system can realize the online detection of the rotating diode faults of the rod power supply unit on the premise of not influencing the stable operation of the rod power supply unit and not changing the structure of the rod power supply unit, thereby improving the operation stability of the rod power supply unit and ensuring the power supply reliability of the control rod of the AP1000 unit.
A fault on-line detection method for a rotating diode of an AP1000 rod power supply unit comprises the following steps that S01 excitation current of the AP1000 rod power supply unit in an on-line state is collected through excitation current collection equipment, and the sampling frequency of the excitation current collection equipment is required to be larger than 1000Hz. S02, acquiring the harmonic content of the collected exciting current through an exciting current analysis platform. The excitation current analysis platform can adopt a MATLAB software platform. S03, judging whether faults exist in the rotating diode of the AP1000 bar power supply unit and the types of the faults according to the obtained harmonic content and by combining a harmonic content fault comparison table. According to the method, the harmonic content of the excitation current of the rod power supply unit of the AP1000 nuclear power station can be analyzed by measuring the excitation current, so that the purpose of online detection of the fault of the rotating diode during the operation of the rod power supply unit is achieved.
The harmonic content fault comparison table in the S03 is obtained through the following steps, and the modeling parameters of the generator and the exciter of the AP1000 rod power unit are collected through the modeling parameter collection unit in the S31. S32, a generator model and an exciter model of the AP1000 rod power supply unit are established on a modeling platform according to modeling parameters. S33, the generator model and the exciter model are led into a diode fault analysis platform, normal operation and various fault states of the rotating diode of the AP1000 rod power supply unit are simulated through the diode fault analysis platform, and harmonic content of exciting current corresponding to the normal operation and various fault states of the rotating diode of the AP1000 rod power supply unit is obtained to form a harmonic content fault comparison table.
As shown in fig. 1 to 4, the harmonic content fault lookup table specifically includes that when the rotating diode is operating normally, 6 th harmonic content in the first 6 th harmonic is far higher than other harmonic content; when a single rotating diode is opened, the fundamental wave content in the first 6 harmonics is larger than the 2-order harmonic content, and the 2-order harmonic content far exceeds the other harmonic content; when two rotating diodes in the same phase are open, the 2 nd harmonic content in the first 6 th harmonic is far more than the other harmonic content; when two rotating diodes of different phases are open, the fundamental wave content in the first 6 harmonics is far higher than the other harmonic contents.
The S32 further includes verifying the correctness of the generator model and the exciter model by the model verification unit. The excitation current during normal operation of the rod power unit is simulated in the simple software, and the following steps are obtained: the excitation current during normal operation contains mainly 6 th order harmonics. The actual running current of the acquisition rod power supply unit is analyzed, and the following steps are obtained: the excitation current during normal operation contains mainly 6 th order harmonics. The two analysis results are consistent, and the correctness of the establishment of the AP1000 rod power supply unit model can be proved.
According to the method, on the premise that the stable operation of the rod power supply unit is not affected and the structure of the rod power supply unit is not changed, the fault on-line detection of the rotating diode of the rod power supply unit is realized by measuring the excitation current of the rod power supply unit of the AP1000 nuclear power station and analyzing the harmonic content of the excitation current, so that the operation stability of the rod power supply unit is improved, and the power supply reliability of the control rod of the AP1000 unit is ensured.
The above examples are only illustrative of the preferred embodiments of the present application and do not limit the spirit and scope of the present application. Various modifications and improvements of the technical scheme of the present application will fall within the protection scope of the present application without departing from the design concept of the present application, and the technical content of the present application is fully described in the claims.
Claims (8)
1. A trouble on-line measuring system for AP1000 stick power unit rotating diode, its characterized in that: comprising
The excitation current acquisition equipment is used for acquiring excitation current of the AP1000 rod power supply unit;
the excitation current analysis platform is used for acquiring the harmonic content of the collected excitation current;
the harmonic content fault comparison module comprises a harmonic content fault comparison table for judging whether faults exist in the rotating diode of the AP1000 bar power supply unit or not and specific fault types according to the obtained harmonic content;
the harmonic content fault comparison table specifically comprises,
when the rotating diode normally operates, 6 harmonic contents in the first 6 harmonic waves far exceed other harmonic contents;
when a single rotating diode is opened, the fundamental wave content in the first 6 harmonics is larger than the 2-order harmonic content, and the 2-order harmonic content far exceeds the other harmonic content;
when two rotating diodes in the same phase are open, the 2 nd harmonic content in the first 6 th harmonic is far more than the other harmonic content;
when two rotating diodes in different phases are opened, the fundamental wave content in the first 6 harmonics is far higher than the other harmonic wave contents;
the sampling frequency of the exciting current acquisition equipment is larger than 1000Hz.
2. The fault on-line detection system for rotating diodes of an AP1000 bar power pack of claim 1, wherein: the harmonic content fault control module further comprises
The modeling parameter acquisition unit is used for acquiring modeling parameters of the generator and the exciter of the AP1000 rod power unit;
the modeling platform is used for establishing a generator model and an exciter model of the AP1000 rod power supply unit according to modeling parameters;
the diode fault analysis platform is used for importing a generator model and an exciter model, simulating normal operation and various fault states of the rotating diode of the AP1000 rod power supply unit, and obtaining harmonic content of exciting current corresponding to the normal operation and various fault states of the rotating diode of the AP1000 rod power supply unit to form a harmonic content fault comparison table.
3. The fault on-line detection system for the rotating diode of the AP1000 bar power unit according to claim 2, wherein: the harmonic content fault control module further comprises
And the model verification unit is used for verifying the correctness of the generator model and the exciter model.
4. The fault on-line detection system for the rotating diode of the AP1000 bar power unit according to claim 2, wherein: the modeling platform includes a MAXWELL software platform.
5. The fault on-line detection system for the rotating diode of the AP1000 bar power unit according to claim 2, wherein: the diode fault analysis platform comprises a simple software platform.
6. The fault online detection method for the rotating diode of the AP1000 bar power unit is characterized by comprising the following steps of: comprises the following steps
S01, collecting exciting current of the AP1000 rod power supply unit in an on-line state through exciting current collecting equipment;
s02, acquiring the harmonic content of the collected exciting current through an exciting current analysis platform;
s03, judging whether faults exist in the rotating diode of the AP1000 bar power supply unit and the types of the faults according to the obtained harmonic content and by combining a harmonic content fault comparison table;
the harmonic content fault comparison table specifically comprises,
when the rotating diode normally operates, 6 harmonic contents in the first 6 harmonic waves far exceed other harmonic contents;
when a single rotating diode is opened, the fundamental wave content in the first 6 harmonics is larger than the 2-order harmonic content, and the 2-order harmonic content far exceeds the other harmonic content;
when two rotating diodes in the same phase are open, the 2 nd harmonic content in the first 6 th harmonic is far more than the other harmonic content;
when two rotating diodes in different phases are opened, the fundamental wave content in the first 6 harmonics is far higher than the other harmonic wave contents;
the sampling frequency of the exciting current acquisition equipment is larger than 1000Hz.
7. The online fault detection method for the rotating diode of the AP1000 bar power unit according to claim 6, wherein the fault detection method comprises the following steps: the harmonic content fault comparison table in the S03 is obtained through the following steps,
s31, acquiring modeling parameters of an AP1000 rod power supply unit generator and an exciter by a modeling parameter acquisition unit;
s32, establishing a generator model and an exciter model of the AP1000 rod power supply unit on a modeling platform according to modeling parameters;
s33, the generator model and the exciter model are led into a diode fault analysis platform, normal operation and various fault states of the rotating diode of the AP1000 rod power supply unit are simulated through the diode fault analysis platform, and harmonic content of exciting current corresponding to the normal operation and various fault states of the rotating diode of the AP1000 rod power supply unit is obtained to form a harmonic content fault comparison table.
8. The online fault detection method for the rotating diode of the AP1000 bar power unit according to claim 7, wherein the fault detection method comprises the following steps: the S32 further includes verifying the correctness of the generator model and the exciter model by the model verification unit.
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