CN113985284A - System and method for monitoring additional diesel generator of nuclear power station - Google Patents

System and method for monitoring additional diesel generator of nuclear power station Download PDF

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Publication number
CN113985284A
CN113985284A CN202111416215.8A CN202111416215A CN113985284A CN 113985284 A CN113985284 A CN 113985284A CN 202111416215 A CN202111416215 A CN 202111416215A CN 113985284 A CN113985284 A CN 113985284A
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data
module
diesel generator
voltage
formula
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何洋
赵江
易晋松
褚楚
徐日升
周项超
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Hainan Nuclear Power Co Ltd
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Hainan Nuclear Power Co Ltd
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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
    • G01R31/34—Testing dynamo-electric machines
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
    • G06F17/10—Complex mathematical operations
    • G06F17/16—Matrix or vector computation, e.g. matrix-matrix or matrix-vector multiplication, matrix factorization
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
    • G06F17/10—Complex mathematical operations
    • G06F17/18—Complex mathematical operations for evaluating statistical data, e.g. average values, frequency distributions, probability functions, regression analysis
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
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    • G06Q10/06—Resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation modelling
    • G06Q10/063—Operations research, analysis or management
    • G06Q10/0639—Performance analysis of employees; Performance analysis of enterprise or organisation operations
    • G06Q10/06393—Score-carding, benchmarking or key performance indicator [KPI] analysis
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
    • G06Q50/06—Electricity, gas or water supply

Abstract

The invention relates to a system and a method for monitoring an additional diesel generator of a nuclear power station, wherein the system comprises the following steps: the data acquisition module is used for acquiring the running data of the generator; the data preprocessing module is used for receiving and preprocessing the operation data; the data storage module is used for receiving and storing the preprocessed operation data; the data evaluation module is used for receiving the preprocessed data and carrying out comprehensive evaluation; and the display alarm module displays and alarms according to the combined evaluation result. The invention provides a monitoring system and a monitoring method for an additional diesel generator of a nuclear power station, which are used for effectively monitoring the additional diesel generator in real time, accurately mastering the running state of the additional diesel generator and timely early warning the abnormal state.

Description

System and method for monitoring additional diesel generator of nuclear power station
Technical Field
The invention belongs to the technical field of monitoring equipment, and particularly relates to a system and a method for monitoring an additional diesel generator of a nuclear power station.
Background
The reliability reduction of the emergency diesel unit can increase the probability of the nuclear power plant full power failure (SBO) accident, and the improvement of the reliability of the emergency power supply is of great importance to nuclear safety. In addition, the failure of the emergency diesel generator set increases the shutdown risk, and directly influences the unit availability of the nuclear power station and the benefit of the power plant. The reliability of the emergency power supply needs to be improved, and an additional diesel generator set needs to be additionally arranged to serve as an additional power supply besides the improvement of the reliability of the emergency diesel generator set. The additional diesel engine set is arranged to provide an additional alternating current power supply for the nuclear power plant, so that the melting frequency of the nuclear power plant is reduced, and the safety level of the power plant is improved. The method is characterized in that the method is used for replacing an emergency diesel engine to realize the on-line overhaul of the emergency diesel engine and eliminate the key path time occupied by overhaul of the emergency diesel engine in the overhaul of the nuclear power unit, thereby shortening the overhaul period and improving the unit availability. The additional alternating current power supply has important significance for improving the nuclear safety level of the two power stations and improving the economic benefit and social benefit of the nuclear power unit. However, the safe and reliable operation of the additional diesel generator will seriously affect the normal operation of the nuclear power plant and even the safe operation of the nuclear power plant. Therefore, there is a need for a monitoring system and method to effectively monitor the additional diesel generator in real time, accurately grasp the operating state of the additional diesel generator, and timely warn of abnormal conditions.
Disclosure of Invention
Aiming at the technical problems in the background technology, the invention provides a monitoring system and a monitoring method for an additional diesel generator of a nuclear power station, so as to effectively monitor the additional diesel generator in real time, accurately master the running state of the additional diesel generator and timely warn abnormal states.
The technical scheme adopted by the invention is as follows:
a nuclear power plant add-on diesel generator monitoring system comprising:
the data acquisition module is used for acquiring the running data of the generator;
the data preprocessing module is used for receiving and preprocessing the operation data;
the data storage module is used for receiving and storing the preprocessed operation data;
the data evaluation module is used for receiving the preprocessed data and carrying out comprehensive evaluation;
and the display alarm module displays and alarms according to the comprehensive evaluation result.
Further, the data acquisition module comprises:
the voltage acquisition module is used for acquiring the voltage of the generator and transmitting the voltage to the data preprocessing module;
the current acquisition module is used for acquiring the current of the generator and transmitting the current to the data preprocessing module;
and the rotating speed acquisition module is used for acquiring the rotating speed of the generator and transmitting the rotating speed to the data preprocessing module.
The system further comprises a communication module, and the data preprocessing module is connected with the data evaluation module through the communication module.
Further, the data preprocessing module comprises:
the first regulating circuit is used for receiving and processing the operation data transmitted by the voltage acquisition module;
the second regulating circuit is used for receiving and processing the operation data transmitted by the current acquisition module;
the third regulating circuit is used for receiving and processing the operation data transmitted by the rotating speed acquisition module;
and the A/D conversion module is used for receiving the operation data transmitted by the first regulating circuit, the second regulating circuit and the third regulating circuit, performing analog-to-digital conversion on the operation data and transmitting the converted data to the data evaluation module.
A method for monitoring an additional diesel generator of a nuclear power station comprises the following steps:
s1, collecting operation data according to a preset period;
s2, receiving and preprocessing the operation data;
s3, receiving the preprocessed operation data, performing comprehensive evaluation, and obtaining a comprehensive score;
and S4, displaying and alarming according to the comprehensive scores.
Further, the comprehensive evaluation step in step S3 includes:
a1, constructing a step hierarchical structure by using an analytic hierarchy process, wherein Y is a target layer, A, B, C is a target layer, and A1-C11 are index layers; the target layer comprises a reliability index A, a goodness index B and an economy index C respectively; the reliability A indexes comprise a load satisfaction rate A1, a capacity standby rate A2, an operation fault rate A3, a demand fault probability A4 and an unavailability A5; the goodness index B includes: voltage deviation B5, voltage fluctuation B6, total harmonic distortion rate B7, three-phase unbalance B8 and frequency deviation B9; the economic indicators C include operating maintenance cost C10 and fuel cost C11;
a2, obtaining data of the index layers A1-C11 by calculation,
the load satisfaction rate a1 represents the degree to which the load demand is satisfied by the additional diesel generator, and is calculated by the following equation:
Figure BDA0003375856470000031
in the formula: pDERepresents the sum of the generated power of the additional diesel generators; pLRepresenting the demanded power of the load;
the operation failure probability a2 represents the number of failures of the diesel generator per unit time during operation, and is calculated by the following formula:
Figure BDA0003375856470000032
in the formula: t is the accumulated running time; n is the accumulated failure times;
the demand fault probability a3 represents the probability that a device refuses to change state when the device is required to change state, and is calculated by the following formula:
Figure BDA0003375856470000033
in the formula: n is a radical ofFThe accumulated failure times when the equipment state is changed are obtained; n is a radical ofDThe total number of device state changes;
the unavailability a4 represents the probability that a class of equipment will be unavailable for maintenance or offline testing within the specified time that should be available, and is calculated by the following equation:
Figure BDA0003375856470000041
in the formula: t isuThe equipment is subjected to maintenance or off-line test to cause unavailable time; t isnTime that the device should be available;
the voltage deviation B5 represents the percentage of the actual voltage deviation from the nominal voltage value, calculated by the following equation:
Figure BDA0003375856470000042
in the formula: u shape0Is the actual voltage; u shapeNIs a rated voltage;
the voltage fluctuation B6 represents the percentage of the difference between the adjacent maximum and minimum voltage rms to the rated voltage of the grid, calculated by:
Figure BDA0003375856470000043
in the formula: u shape1Is the maximum effective value; u shape2Is the minimum effective value;
the total harmonic distortion rate B7 represents the waveform-to-sine wave distortion degree, and is calculated by the following equation:
Figure BDA0003375856470000044
in the formula: gnEffective values of all harmonic components; g1Is the effective value of the fundamental component;
the three-phase unbalance degree B8 represents the unbalance degree of three-phase voltage in the system and is calculated by the following formula:
Figure BDA0003375856470000045
in the formula: phi is out of phase, Uφ1Is the effective value of the phase positive sequence voltage; u shapeφ2Is the effective value of the negative sequence voltage of the phase;
the frequency deviation B9 represents the difference between the actual value and the nominal value of the frequency, and is calculated by:
B9＝f0-fN
in the formula: b9 is frequency offset; f. of0Is the actual frequency; f. ofNIs a rated frequency;
the economic indicator C10 represents the maintenance and repair costs after the auxiliary power source is put into operation, and is calculated by the following formula:
C10＝KPi
in the formula: k represents a maintenance cost coefficient of the diesel generator; piRepresenting the output power of the diesel generator; fuel cost C11, calculated by the following equation:
Figure BDA0003375856470000051
the fuel cost of the diesel generator is:
C11＝kDiesel
in the formula: diesel is the oil consumption of the Diesel generator; pDEOutputting power for the diesel generator; pDE-ratedRated output power of the diesel generator; c1And C2Is a correlation coefficient; k is the price of unit diesel oil;
a3, constructing a comparison judgment matrix, and determining a judgment matrix X according to the relation between indexes of the index layers, wherein the element XijFor the importance degree of index i and index j relative to the target layer Y, adoptBy using a 1-9 scaling method, the greater the importance degree is, the more the indexes are combined with the assignment of the expert opinions of the related fields, and the matrix X is a positive and inverse matrix:
Figure BDA0003375856470000052
a4, carrying out normalization calculation on the judgment matrix X by adopting a geometric mean method to obtain a weight matrix, and calculating by the following formula:
Figure BDA0003375856470000061
the method comprises the following steps:
(1) multiplying the elements of X according to rows to obtain a new column vector;
(2) opening each component of the new vector by the power of n;
(3) carrying out normalization calculation on the column vector;
a5, correcting the weight matrix by an entropy weight method to obtain a final comprehensive weight value, wherein the method comprises the following steps:
(1) normalizing the rows of the judgment matrix X to obtain a standardized judgment matrix X;
(2) carrying out entropy weight method analysis on the standardized judgment matrix X to calculate an entropy weight matrix;
(3) correcting the index weight of the weight matrix through the entropy weight matrix to obtain the comprehensive weight q of each test itemi；
a6, carrying out comprehensive calculation on the comprehensive weight and the index layer data to obtain a comprehensive score, and calculating according to the following formula:
Figure BDA0003375856470000062
in the formula: q. q.siFor comprehensive weight, A1-C11 are data of index layer.
Compared with the prior art, the invention has the beneficial effects that:
1. the data acquisition module is used for acquiring the running parameters of the generator in real time, comprehensively evaluating the running parameters to obtain comprehensive scores, and then displaying and alarming the comprehensive scores in real time, so that the diesel generator is effectively monitored in real time and the reliability of the diesel generator is prejudged, the deterioration conditions of a unit system and a whole machine can be accurately evaluated and early warned, maintenance items can be reasonably arranged, targeted maintenance is realized, the economic benefit is greatly improved, and the safe operation of a nuclear power plant is further ensured.
2. The analytic data can be effectively corrected by combining the analytic hierarchy process and the entropy weight process for analysis, and the precision of analyzing the operational data is greatly improved.
Drawings
FIG. 1 is a schematic diagram of the overall system of the present invention;
FIG. 2 is a system diagram of evaluation indicators according to the present invention;
in the figure: 1. a voltage acquisition module; 2. a current collection module; 3. a rotating speed acquisition module; 4. a data acquisition module; 5. a first regulating circuit; 6. a second regulating circuit; 7. a third regulating circuit; 8. an A/D conversion module; 9. a data storage module; 10. a data preprocessing module; 11. a data evaluation module; 12. and a display alarm module.
Detailed Description
In order to better understand the technical content of the invention, specific embodiments are provided below, and the invention is further described with reference to the accompanying drawings.
Referring to fig. 1 to 2, the present invention provides a nuclear power plant additional diesel generator monitoring system, including: the data acquisition module 4 is used for acquiring the running data of the generator; the data preprocessing module 10 is used for receiving the operation data, preprocessing and transmitting the operation data; the data storage module 9 is used for receiving and storing the preprocessed operation data; the data evaluation module 11 comprises an FPGA digital signal processing module and a host module, the FPGA digital signal processing module has 128 analog quantity (including alternating current quantity, direct current quantity and high-frequency wave detection quantity), 512 switching quantity and a pair of optical input units 12 (used for accessing the acquisition module), the FPGA digital signal processing module carries out integration, interpolation, packet processing and other processing on received data signals, simultaneously carries out data coding according to a transmission protocol and converts the processed data into optical signals to output the optical signals to the host module, the FPGA digital signal processing module can monitor the power supply state of the AD data processing module in real time to realize the real-time early warning function of abnormal conditions of a power supply, thereby quickly judging the validity and correctness of AD acquisition data, the host module is realized by adopting XC3SD 250E-FPGA chips of Xilinx company, the XC3SD 250E-FPGA chips have the working frequency of 200Mhz and the number of logic gates of 250k, a large number of on-chip memory units are provided, and the external part can normally operate only by one PROM memory; and the display alarm module 12 receives the data transmitted by the data evaluation module 11 to display and alarm, and the display alarm module 12 adopts a liquid crystal display screen.
Specifically, the data acquisition module 4 includes: the voltage acquisition module 1 is used for acquiring the voltage of the generator and transmitting the voltage to the data preprocessing module 10, and the voltage acquisition module 1 adopts a mutual inductor; the current acquisition module 2 is used for acquiring the current of the generator and transmitting the current to the data preprocessing module 10, and the current acquisition module 2 also adopts a mutual inductor; the rotating speed acquisition module 3 is used for acquiring the rotating speed of the generator and transmitting the rotating speed to the data preprocessing module 10, and the rotating speed acquisition module 3 adopts a photoelectric rotating speed sensor and technical parameters of the photoelectric rotating speed sensor: the rotating speed measuring range is 0-2000 rpm; the power supply voltage is 10VDC-30 VDC; power consumption current <50 mA; the number of pulses per revolution is 200; duty ratio is 50% +/-20%; the insulation strength is 500VAC/50Hz/1 min; the insulation resistance is more than or equal to 20M omega.
Specifically, the system further comprises a communication module, and the data preprocessing module 10 is connected with the data evaluation module 11 through the communication module and realizes remote communication.
Specifically, the data preprocessing module 10 includes: the first regulating circuit 5 is used for receiving and processing the operation data transmitted by the voltage acquisition module 1 so as to improve the accuracy of voltage acquisition; the second regulating circuit 6 is used for receiving and processing the operation data transmitted by the current acquisition module 2 so as to improve the accuracy of current acquisition; the third regulating circuit 7 is used for receiving and processing the operation data transmitted by the rotating speed acquisition module 3 so as to improve the precision of rotating speed acquisition; the a/D conversion module 8 is configured to receive the operation data transmitted by the first adjusting circuit 5, the second adjusting circuit 6, and the third adjusting circuit 7, perform analog-to-digital conversion, and transmit the converted data to the data evaluation module 11, where the a/D conversion module 8 adopts an AD7606 chip, and the AD7606 chip has the following main characteristics: the true bipolar analog input range is +/-10V and +/-5V; a 5V single-analog power supply, wherein VDRIVE is 2.3V-5V; the sampling precision of 16 bits is achieved, 8-channel synchronous sampling is supported, and the sampling frequency can reach 200kSPS at most; an input buffer with a built-in 2-order anti-aliasing analog filter and 1M omega analog input impedance; precise voltage and buffering in the chip.
The method for monitoring the additional diesel generator of the nuclear power station comprises the following steps:
s1, acquiring the running data of the generator by using the data acquisition module 4 according to a preset period;
s2, the data preprocessing module 10 receives the collected operation data and carries out preprocessing such as denoising and analog-to-digital conversion;
s3, the data evaluation module 11 receives the preprocessed operation data to carry out comprehensive evaluation and obtain a comprehensive score;
and S4, the display module displays and gives an alarm according to the comprehensive score.
Specifically, the comprehensive evaluation step in step S3 includes:
a1, constructing a step hierarchical structure by using an analytic hierarchy process, wherein Y is a target layer, A, B, C is a target layer, and A1-C11 are index layers; the target layer comprises a reliability index A, a goodness index B and an economy index C respectively; the reliability A indexes comprise a load satisfaction rate A1, a capacity standby rate A2, an operation fault rate A3, a demand fault probability A4 and an unavailability A5; the goodness index B includes: voltage deviation B5, voltage fluctuation B6, total harmonic distortion rate B7, three-phase unbalance B8 and frequency deviation B9; the economic indicators C include operating maintenance cost C10 and fuel cost C11;
a2, obtaining data of the index layers A1-C11 by calculation,
the load satisfaction rate a1 represents the degree to which the load demand is satisfied by the additional diesel generator, and is calculated by the following equation:
Figure BDA0003375856470000091
in the formula: pDERepresents the sum of the generated power of the additional diesel generators; pLRepresenting the demanded power of the load;
the operation failure probability a2 represents the number of failures of the diesel generator per unit time during operation, and is calculated by the following formula:
Figure BDA0003375856470000092
when the number of equipment operation faults is 0, 'χ' is adopted2Rule at 50% "as an approximate estimation method, calculated by the following equation:
Figure BDA0003375856470000101
in the formula: t is the accumulated running time; n is the accumulated failure times;
the demand fault probability a3 represents the probability that a device refuses to change state when the device is required to change state, and is calculated by the following formula:
Figure BDA0003375856470000102
when the failure frequency of the equipment during conversion is 0, adopting 'chi' mode2Rule at 50% "as an approximate estimation method, calculated by the following equation:
Figure BDA0003375856470000103
in the formula: n is a radical ofFThe accumulated failure times when the equipment state is changed are obtained; n is a radical ofDThe total number of device state changes;
the unavailability a4 represents the probability that a class of equipment will be unavailable for maintenance or offline testing within the specified time that should be available, and is calculated by the following equation:
Figure BDA0003375856470000104
in the formula: t isuThe equipment is subjected to maintenance or off-line test to cause unavailable time; t isnTime that the device should be available;
the voltage deviation B5 represents the percentage of the actual voltage deviation from the nominal voltage value, calculated by the following equation:
Figure BDA0003375856470000105
in the formula: u shape0Is the actual voltage; u shapeNIs a rated voltage;
the voltage fluctuation B6 represents the percentage of the difference between the adjacent maximum and minimum voltage rms to the rated voltage of the grid, calculated by:
Figure BDA0003375856470000111
in the formula: u shape1Is the maximum effective value; u shape2Is the minimum effective value;
the total harmonic distortion rate B7 represents the waveform-to-sine wave distortion degree, and is calculated by the following equation:
Figure BDA0003375856470000112
in the formula: gnEffective values of all harmonic components; g1Is the effective value of the fundamental component;
the three-phase unbalance degree B8 represents the unbalance degree of three-phase voltage in the system and is calculated by the following formula:
Figure BDA0003375856470000113
in the formula: phi is out of phase, Uφ1Is the effective value of the phase positive sequence voltage; u shapeφ2Is the effective value of the negative sequence voltage of the phase;
the frequency deviation B9 represents the difference between the actual value and the nominal value of the frequency, and is calculated by:
B9＝f0-fN
in the formula: b9 is frequency offset; f. of0Is the actual frequency; f. ofNIs a rated frequency;
the economic indicator C10 represents the maintenance and repair costs after the auxiliary power source is put into operation, and is calculated by the following formula:
C10＝KPi
in the formula: k represents a maintenance cost coefficient of the diesel generator; piRepresenting the output power of the diesel generator; fuel cost C11, calculated by the following equation:
Figure BDA0003375856470000114
the fuel cost of the diesel generator is:
C11＝kDiesel
in the formula: diesel is the oil consumption of the Diesel generator; pDEOutputting power for the diesel generator; pDE-ratedRated output power of the diesel generator; c1And C2Is a correlation coefficient; k is the price of unit diesel oil;
a3, constructing a comparison judgment matrix, and determining a judgment matrix X according to the relation between indexes of the index layers, wherein the element XijFor the importance degree of the index i and the index j relative to the target layer Y, a 1-9 scale method is adopted, the greater the importance degree is, the matrix X is a positive and negative matrix through the combination of the index itself and the assignment of the expert opinions of the related fields:
Figure BDA0003375856470000121
a4, carrying out normalization calculation on the judgment matrix X by adopting a geometric mean method to obtain a weight matrix, and calculating by the following formula:
Figure BDA0003375856470000122
the method comprises the following steps:
(1) multiplying the elements of X according to rows to obtain a new column vector;
(2) opening each component of the new vector by the power of n;
(3) carrying out normalization calculation on the column vector;
a5, in order to ensure the consistency test of the matrix and the reasonability of the index weight, correcting the weight matrix by an entropy weight method to obtain a final comprehensive weight value, wherein the method comprises the following steps:
(1) normalizing and calculating each row of the judgment matrix X to obtain a standardized judgment matrix
Figure BDA0003375856470000123
(2) Standardizing the judgment matrix
Figure BDA0003375856470000124
Carrying out entropy weight method analysis and calculating an entropy weight matrix;
(3) correcting the index weight of the weight matrix through the entropy weight matrix to obtain the comprehensive weight q of each test itemi；
a6, carrying out comprehensive calculation on the comprehensive weight and the index layer data to obtain a comprehensive score, and calculating according to the following formula:
Figure BDA0003375856470000131
in the formula: q. q.siFor comprehensive weight, A1-C11 are data of index layer.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (6)

1. A nuclear power plant add-on diesel generator monitoring system, comprising:
the data acquisition module is used for acquiring the running data of the generator;
the data preprocessing module is used for receiving and preprocessing the operation data;
the data storage module is used for receiving and storing the preprocessed operation data;
the data evaluation module is used for receiving the preprocessed data and carrying out comprehensive evaluation;
and the display alarm module displays and alarms according to the comprehensive evaluation result.
2. The nuclear power plant add-on diesel generator monitoring system of claim 1, wherein said data acquisition module comprises:
the voltage acquisition module is used for acquiring the voltage of the generator and transmitting the voltage to the data preprocessing module;
the current acquisition module is used for acquiring the current of the generator and transmitting the current to the data preprocessing module;
and the rotating speed acquisition module is used for acquiring the rotating speed of the generator and transmitting the rotating speed to the data preprocessing module.
3. The system for monitoring the additional diesel generator in the nuclear power plant as recited in claim 2, further comprising a communication module, wherein the data preprocessing module is connected with the data evaluation module through the communication module.
4. The nuclear power plant add-on diesel generator monitoring system of claim 3, wherein said data preprocessing module comprises:
the first regulating circuit is used for receiving and processing the operation data transmitted by the voltage acquisition module;
the second regulating circuit is used for receiving and processing the operation data transmitted by the current acquisition module;
the third regulating circuit is used for receiving and processing the operation data transmitted by the rotating speed acquisition module;
and the A/D conversion module is used for receiving the operation data transmitted by the first regulating circuit, the second regulating circuit and the third regulating circuit, performing analog-to-digital conversion on the operation data and transmitting the converted data to the data evaluation module.
5. A method for monitoring an additional diesel generator of a nuclear power station is characterized by comprising the following steps:
s1, collecting operation data according to a preset period;
s2, receiving and preprocessing the operation data;
s3, receiving the preprocessed operation data, performing comprehensive evaluation, and obtaining a comprehensive score;
and S4, displaying and alarming according to the comprehensive scores.
6. The nuclear power plant extra diesel generator monitoring method as claimed in claim 5, wherein the comprehensive evaluation step in the step S3 includes:
a1, constructing a step hierarchical structure by using an analytic hierarchy process, wherein Y is a target layer, A, B, C is a target layer, and A1-C11 are index layers; the target layer comprises a reliability index A, a goodness index B and an economy index C respectively; the reliability A indexes comprise a load satisfaction rate A1, a capacity standby rate A2, an operation fault rate A3, a demand fault probability A4 and an unavailability A5; the goodness index B includes: voltage deviation B5, voltage fluctuation B6, total harmonic distortion rate B7, three-phase unbalance B8 and frequency deviation B9; the economic indicators C include operating maintenance cost C10 and fuel cost C11;
a2, obtaining data of the index layers A1-C11 by calculation,
the load satisfaction rate a1 represents the degree to which the load demand is satisfied by the additional diesel generator, and is calculated by the following equation:
Figure FDA0003375856460000021
in the formula: pDERepresents the sum of the generated power of the additional diesel generators; pLRepresenting the demanded power of the load;
the operation failure probability a2 represents the number of failures of the diesel generator per unit time during operation, and is calculated by the following formula:
Figure FDA0003375856460000022
in the formula: t is the accumulated running time; n is the accumulated failure times;
the demand fault probability a3 represents the probability that a device refuses to change state when the device is required to change state, and is calculated by the following formula:
Figure FDA0003375856460000031
in the formula: n is a radical ofFThe accumulated failure times when the equipment state is changed are obtained; n is a radical ofDThe total number of device state changes;
the unavailability a4 represents the probability that a class of equipment will be unavailable for maintenance or offline testing within the specified time that should be available, and is calculated by the following equation:
Figure FDA0003375856460000032
in the formula: t isuThe equipment is subjected to maintenance or off-line test to cause unavailable time; t isnTime that the device should be available;
the voltage deviation B5 represents the percentage of the actual voltage deviation from the nominal voltage value, calculated by the following equation:
Figure FDA0003375856460000033
in the formula: u shape0Is the actual voltage; u shapeNIs a rated voltage;
the voltage fluctuation B6 represents the percentage of the difference between the adjacent maximum and minimum voltage rms to the rated voltage of the grid, calculated by:
Figure FDA0003375856460000034
in the formula: u shape1Is the maximum effective value; u shape2Is the minimum effective value;
the total harmonic distortion rate B7 represents the waveform-to-sine wave distortion degree, and is calculated by the following equation:
Figure FDA0003375856460000035
in the formula: gnEffective values of all harmonic components; g1Is the effective value of the fundamental component;
the three-phase unbalance degree B8 represents the unbalance degree of three-phase voltage in the system and is calculated by the following formula:
Figure FDA0003375856460000036
in the formula: phi is out of phase, Uφ1Is the effective value of the phase positive sequence voltage; u shapeφ2Is the effective value of the negative sequence voltage of the phase;
the frequency deviation B9 represents the difference between the actual value and the nominal value of the frequency, and is calculated by:
B9＝f0-fN
in the formula: b9 is frequency offset; f. of0Is the actual frequency; f. ofNIs a rated frequency;
the economic indicator C10 represents the maintenance and repair costs after the auxiliary power source is put into operation, and is calculated by the following formula:
C10＝KPi
in the formula: k represents a maintenance cost coefficient of the diesel generator; piRepresenting the output power of the diesel generator;
fuel cost C11, calculated by the following equation:
Figure FDA0003375856460000041
the fuel cost of the diesel generator is:
C11＝kDiesel
in the formula: diesel is the oil consumption of the Diesel generator; pDEOutputting power for the diesel generator; pDE-ratedRated output power of the diesel generator; c1And C2Is a correlation coefficient; k is the price of unit diesel oil;
a3, constructing a comparison judgment matrix, and determining a judgment matrix X according to the relation between indexes of the index layers, wherein the element XijFor the importance degree of the index i and the index j relative to the target layer Y, a 1-9 scale method is adopted, the greater the importance degree is, the matrix X is a positive and negative matrix through the combination of the index itself and the assignment of the expert opinions of the related fields:
Figure FDA0003375856460000042
a4, carrying out normalization calculation on the judgment matrix X by adopting a geometric mean method to obtain a weight matrix, and calculating by the following formula:
Figure FDA0003375856460000051
the method comprises the following steps:
(1) multiplying the elements of X according to rows to obtain a new column vector;
(2) opening each component of the new vector by the power of n;
(3) carrying out normalization calculation on the column vector;
a5, correcting the weight matrix by an entropy weight method to obtain a final comprehensive weight value, wherein the method comprises the following steps:
(1) normalizing and calculating each row of the judgment matrix X to obtain a standardized judgment matrix
Figure FDA0003375856460000052
(2) Standardizing the judgment matrix
Figure FDA0003375856460000053
Carrying out entropy weight method analysis and calculating an entropy weight matrix;
(3) correcting the index weight of the weight matrix through the entropy weight matrix to obtain the comprehensive weight q of each test itemi；
a6, carrying out comprehensive calculation on the comprehensive weight and the index layer data to obtain a comprehensive score, and calculating according to the following formula:
Figure FDA0003375856460000054
in the formula: q. q.siFor comprehensive weight, A1-C11 are data of index layer.
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