KR100603217B1 - Apparatus for detecting failure of power converter unit in control rod control system of an nuclear reactor and method thereof - Google Patents

Abstract

The failure detection device of the power conversion unit of the control rod control system of the reactor according to the present invention, the main control unit 125 for controlling the power conversion unit 103, the control rod drive device 106 and the control rod control system of the control rod control system to the reactor. In the apparatus for detecting whether or not the power converter 103 is installed to be electrically connected to each of:

A signal processor 118 that receives DC voltages of the coils 107, 108, and 109 of the control rod drive device 106 of the nuclear reactor and performs low frequency filtering scale adjustment; An analog-digital converter 119 which receives an analog signal output from the signal processor 118 and converts the analog signal into a digital signal and outputs the digital signal; The failure of the power converter 103 is detected by a failure detection method using wavelet conversion by receiving the digital data output from the analog-digital converter 119 and driving the control rod from the main controller 125. A central processing unit (120) for receiving a control command related to the operation of the device (106) to control the power supply for the control rod drive device (106) to perform a desired operation; A field-programmable gate array (FPGA) 121 for receiving a digital signal output from the analog-digital converter 119 and implementing digital logic related to the detection of failure of the power converter 103; A digital-analog converter 122 which receives the digital signal output through the FPGA 121 and converts the digital signal into an analog signal and outputs the analog signal; A memory 123 for storing a variety of data and software programs related to signal processing in the central processing unit 120 and digital logic implementation in the FPGA 121; And a timer counter 124 that counts and outputs a supply power control related command signal from the central processing unit 120 output through the FPGA 121 at predetermined time intervals.

According to the present invention as described above, by monitoring the failure of the power conversion unit at all times, it is possible to further prevent the uninterruption of the power plant and further improve the nuclear power plant operating rate.

Description

Apparatus for detecting failure of power converter unit in control rod control system of an nuclear reactor and method             

1 is a view showing the configuration of a failure detection device of the power conversion unit of the control rod control system of the reactor according to the present invention.

Figure 2 is a flow chart showing the execution process of the failure detection method of the power converter of the control rod control system of the reactor according to the present invention.

3 is a view showing voltage and current waveforms of a stop clamp coil when a control rod moves by one step in a control rod control system of a nuclear reactor employing the failure detection device of the present invention.

4 is a diagram showing coil voltage waveforms when an abnormality occurs in a power conversion unit in a control rod control system of a nuclear reactor employing the failure detection device of the present invention.

FIG. 5 is a diagram showing fluctuations in coil voltage and wavelet transform coefficients when a phase skip failure occurs during a maximum positive force during control rod movement. FIG.

FIG. 6 is a diagram illustrating fluctuations in coil voltage and wavelet transform coefficients when a diode operation failure occurs during a maximum negative force during control rod movement. FIG.

Fig. 7 is a view showing fluctuations in coil voltage and wavelet transform coefficients when a phase-fall failure occurs in a three-phase half-wave converter for a stop clamping coil in a stopped state of a control rod.

8 is a view showing fluctuations in coil voltage and wavelet transform coefficients when a diode operation failure occurs in a three-phase half-wave converter for a stop tong coil in a control rod stop state.

9 is a diagram showing fluctuations in coil voltage and wavelet conversion coefficients when a diode operation failure occurs in a control rod stop state when there is a frequency variation of an input power source.

<Explanation of symbols for the main parts of the drawings>

101 ... Input power 102 ... 3-phase half-wave converter

103 Power converter 104 ... Thyristor

105 ... gate drive 106 ... control rod drive

107 raising coil 108 ... moving tong coil

109.Stop clamp coil 110

111.Arrange armature 112.Moving tongs

113.Stop clamp 114 Drive shaft

115 Transformers 116 Transformers

117 Fault detection device 118 Signal processing unit

119 Analog-to-digital converter 120 Central processing unit

121 ... FPGA 122 ... Digital-to-Analog Converter

123 Memory 124 Timer Counter

125.Main control unit

The present invention relates to a failure detection device and method of the power conversion unit of the control rod control system of the reactor, in particular to constantly monitor the failure of the control rod control system power conversion unit to improve the functional constraints of the temporary failure detection of the pulsation detector, The present invention relates to a failure detection device and a method of a power conversion unit of a control rod control system of a reactor capable of detecting failures more simply and clearly than a power converter failure detection method of the present invention.

In general, heat output control of a reactor is achieved through the control of nuclear reactions by vertical movement of control rods made of neutron absorbers. The control rod drive is in the form of an electromagnetic jack (Jack) to move the control rod up and down through the sequence operation of the mechanism by the coils that are energized by the current. The control rod control system selects a moving target control rod and controls the operation of the control rod drive device to move the selected control rod as required. The control rod control system receives the control rod movement-related control commands from the operator's manual operation or the reactor output control system, selects the control rods to be moved, determines the moving conditions, and transfers them to the lower controller. It is composed of a power control and monitoring unit that controls the power supply and monitors the operation so that the associated control rod drive device receives the related control command to perform the desired operation. If a failure occurs in the power converter that supplies current to each coil of the control rod drive, the control rod may not move properly or fall, which may adversely affect the reactor output control. For this reason, fast and accurate detection of power converter failure is required.

The types of faults that can occur in the power conversion unit are malfunctions such as thyristors are not driven due to fuse failure, etc., or the thyristors act like diodes because the drive signals are not connected. In order to detect this fault, the existing facility has a pulsation detector. The specific failure determination method of the pulsation detector is as follows. In order for the control rod to move one step, the stationary tong coil, the moving tong coil and the raising coil in the control rod driving device are alternately excited in a predetermined sequence so that the mechanisms driven by the respective coils are operated in turn. In order to obtain a predetermined sequence operation for each coil, it is necessary to adjust the coil current level. For this, the thyristor firing angle of the three-phase half-wave converter is adjusted. To raise the current level, the firing angle is pulled forward and this process is called the maximum positive force. Slowly slows the firing angle when the current approaches the command value and maintains it when the current reaches the command value. In order to lower the current level, the firing angle is slowed back to the maximum and this process is called the maximum negative force. Slowly advances the firing angle when the current approaches the command value and maintains it when the current reaches the command value. There is a big difference in the pulsation magnitudes before and after the failure in the coil voltage waveform when the phase-out failure occurs at the maximum positive force and when the diode operation fault occurs at the maximum negative force. The output voltage value of the pulsation detector is proportional to the pulsation magnitude of the current coil voltage and it is determined that a failure has occurred when the detector output voltage exceeds + 8.2V. The pulsation detector installs a zener diode to be used as a negative clipper, thereby adjusting the ratio of the pulsation magnitude before and after failure. After cutting the pulsation level at a certain level, the ratio of the normal voltage pulsation magnitude and phase missed pulsation magnitude in positive forcing is about 1: 3, and the ratio of the normal voltage pulsation magnitude and diode operating failure pulsation magnitude in negative forcing is This is equal to 1: 3, and by setting this ratio, + 8.2V is the threshold for fault determination.

On the other hand, in a nuclear power plant in charge of the base load, the control rods are often drawn to the maximum and remain stationary without actually performing operations such as insertion or withdrawal. Conventional pulsation detectors determine failures only while the control rod is moving, ie only when the coil current level changes so that a series of sequence actions of the control rod drive occurs for the control rod movement. When the control rod is in a stopped state, that is, when the control rod holding current flows only in the stop tong coil, failure detection cannot be performed by the existing pulsation detector. If a failure occurs in the control rod stop state, there is a risk that the control rod may fall, and therefore, a failure detection is required to determine whether the power converter is abnormal even in the control rod stop state. In addition, the pulsation detector is composed of analog circuitry, which is complicated, and deteriorates with time, and is difficult to maintain and repair.

The technical content of the failure detection of the power converter is the application number 10-2000-0049352 filed by the same applicant and the same applicant, this patent application analyzes the output voltage waveform of the phase control rectifier and phase through the frequency information An apparatus and method for determining a failure of a control rectifier are presented. In other words, to find the frequency information of the DC voltage waveform, Fourier transform is performed, each harmonic term is found, the spectral magnitudes of the frequencies within a certain range are found, and the maximum values are found. Compare and find the maximum value among them and compare the frequency corresponding to the maximum value with the fundamental wave component already determined. Through this process, if the frequency determined by the selection of the final maximum value is already determined fundamental wave component, it is determined as normal operation, otherwise it is determined as a failure.

However, the above-described prior application (Application No. 10-2000-0049352) is input to confirm that the dominant frequency of the pulsating voltage waveform is exactly six times the input power frequency in determining whether the phase control rectifier has failed by using a Fourier transform. The fault detection process is somewhat cumbersome, including the need to account for power frequency variations.

The present invention has been made in view of the above-mentioned matters, and constantly monitors the failure of the control rod control system power converter to improve the functional constraints of the temporary failure detection of the pulsation detector, and is simpler than the conventional power converter failure detection method. It is an object of the present invention to provide a failure detection device and a method of a power converter of a control rod control system of a nuclear reactor capable of clearly detecting a failure.

In order to achieve the above object, the failure detection device of the power conversion unit of the control rod control system of the reactor according to the present invention,

An apparatus for detecting the failure of the power converter is installed so as to be electrically connected to the power converter of the control rod control system, the control rod drive device and the control rod control system of the reactor as a whole.

A signal processor configured to adjust a low frequency filtering scale by receiving a current of each coil of the control rod driver detected through a current transformer and a DC voltage of each coil of the control rod drive detected through a transformer;

An analog-digital converter for receiving an analog signal output from the signal processor and converting the analog signal into a digital signal and outputting the digital signal;

The fault detection method using wavelet conversion is received by receiving the digital data output from the analog-digital converter, and the fault of the power converter is detected, and the control rod is driven by receiving a control command related to the operation of the control rod drive device from the main controller. A central processing unit for controlling the power supply so that the device performs a desired operation;

A field-programmable gate array (FPGA) for receiving a digital signal output from the analog-to-digital converter and for implementing digital logic related to detection of failure of the power converter;

A digital-analog converter that receives the digital signal output through the FPGA and converts the digital signal into an analog signal;

A memory for storing various data and software programs related to signal processing in the central processing unit and digital logic implementation in the FPGA; And

And a timer counter for counting and outputting a supply power control related command signal outputted from the central processing unit through the FPGA at predetermined time intervals.

In addition, in order to achieve the above object, the failure detection method of the power conversion unit of the control rod control system of the reactor according to the present invention,

a) storing a plurality of voltage data sampled at predetermined time intervals of each coil of the control rod driving apparatus of the reactor to obtain voltage data for a predetermined time;

b) wavelet transforming the voltage data obtained in step a) by setting the scale factor to 1/180, and storing the representative value C ₁₈₀ having 2-norm as a result of the coefficient values;

c) wavelet transforming the voltage data obtained in step a) by setting the scale factor to 1/60, and storing the representative value C _{60 of} 2-norm as a result of the coefficient values;

d) whether the wavelet transform coefficient representative value C ₁₈₀ for the scale factor 1/180 taken in step b) is greater than the wavelet transform coefficient representative value C ₆₀ for the scale factor 1/60 taken in step c). Determining;

e) determining that the power converter is in normal operation if C ₁₈₀ is greater than C _{60 as a} result of the determination in step d);

f) if it is determined in step d) that C ₁₈₀ is less than or equal to C ₆₀ , determining that a failure has occurred in the power conversion unit; And

and g) notifying the fact that a failure occurs in the power conversion unit by various display devices.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing the configuration of a failure detection device of the power converter of the control rod control system of the reactor according to the present invention.

Referring to FIG. 1, the failure detection device 117 of the power conversion unit of the control rod control system of a nuclear reactor according to the present invention includes a power conversion unit 103, a control rod driving device 106, and a control rod control system of a control rod control system of a nuclear reactor. It is installed so as to be electrically connected to the main control unit 125 to control the overall, and to detect the failure of the power conversion unit 103, the signal processing unit 118, analog-to-digital converter 119, the central processing unit ( 120, FPGA 121, digital-to-analog converter 122, memory 123, and timer counter 124.

The signal processor 118 is a transformer and the current of each coil of the control rod drive device 106, that is, the lifting coil 107, the moving tong coil 108 and the stationary tong coil 109 detected through the current transformer 116 The low-frequency filtering scale is adjusted by receiving the DC voltages of the coils 107, 108, and 109 of the control rod driving apparatus detected through 115.

The analog-digital converter 119 receives an analog signal output from the signal processor 118 and converts the analog signal into a digital signal.

The central processing unit 120 receives the digital data output from the analog-to-digital converter 119 and detects the failure of the power conversion unit 103 by a failure detection method using wavelet conversion. The control rod driving device 106 receives a control command related to the operation of the control rod driving device from the unit 125 to control the power supply to perform the desired operation. As the central processing unit 120, a DSP (Digital Signal Processor) may be used.

The FPGA 121 receives a digital signal output from the analog-to-digital converter 119 and implements digital logic related to the fault detection of the power converter 103.

The digital-analog converter 122 receives a digital signal output through the FPGA 121 and converts the digital signal into an analog signal and outputs the analog signal.

The memory 123 stores software programs and various data related to signal processing in the central processing unit 120 and digital logic implementation in the FPGA 121.

The timer counter 124 counts and outputs a supply power control related command signal from the central processing unit 120 output through the FPGA 121 at predetermined time intervals.

In Fig. 1, reference numeral 101 is an input power source, 102 is a three-phase half-wave converter, 104 is a thyristor, 105 is a gate drive, 110 is a lifting stimulus, 111 is a lifting armature, 112 is a moving clip, 113 is a stop clamp, 114 is a drive shaft Represent each.

Then, the operation of the failure detection device of the power conversion unit of the control rod control system of the reactor having the above configuration and the failure detection method thereof will be described.

2 is a flowchart illustrating a process of detecting a failure of a power converter of a control rod control system of a nuclear reactor according to the present invention.

Referring to FIG. 2, according to a method of detecting a failure of a power conversion unit of a control rod control system of a nuclear reactor according to the present invention, first, a predetermined time interval of each coil 107, 108, 109 of a control rod driving apparatus of a nuclear reactor (eg, A plurality of (for example, 30) voltage data sampled at 0.56 msec) are stored to obtain voltage data for a predetermined time (1/60 second, about 16.67 msec) (step S201).

The 30 voltage data obtained are then wavelet transformed by first setting the scale factor (a factor that controls the height and width of the wavelet waveform) to 1/180, and as a result, 2-norm (where " 2-norm "is also called Euclidean norm and stores the representative value (C ₁₈₀ ) that takes each coefficient squared, adds them together, and takes the square root of the result to determine the representative size of a subset of coefficients. (Step S202). Then, the voltage data obtained in step S201 is wavelet transformed by setting the scale factor to 1/60, and as a result, the representative value C ₆₀ obtained by taking 2-norm with respect to the coefficient values is stored (step S203).

Thereafter, it is determined whether the wavelet transform coefficient representative value C ₁₈₀ for the scale factor 1/180 taken in step S202 is larger than the wavelet transform coefficient representative value C ₆₀ for the scale factor 1/60 taken in step S203. (Step S204). As a result of this determination, when C ₁₈₀ is larger than C ₆₀ , it is determined that the power converter 103 is in normal operation (step S205). When C ₁₈₀ is less than or equal to C _{60 as a} result of the determination, it is determined that a failure has occurred in the power conversion section 103 (step S206), and various display devices are notified of the failure occurrence in the power conversion section 103. (Step S207).

Hereinafter, the description will be made in detail with respect to the wavelet conversion and fault occurrence in the series of processes as described above, and various failures occurring in the power conversion unit 103.

If the frequency of the AC power source input of the three-phase half wave converter 102 is f, the pulsation frequency of the DC voltage output by the three-phase half wave converter 102 is 3f. Therefore, if the input power supply frequency is 60 Hz, the pulsation frequency of the output DC voltage of the three-phase half-wave converter 102 becomes 180 Hz, which is three times 60 Hz during normal conversion. However, when the conversion is not done properly, it has a pulsation frequency of less than 180Hz, paying attention to this fact, it is determined whether the power converter is abnormal by reading the pulsation frequency. The wavelet transform technique is used to analyze the pulsation waveform to determine the pulsation frequency. The fault detection method using the wavelet transform method is as follows.

The wavelet refers to a curved signal having an integrated value of 0. Among the various wavelets, the present invention uses a Morlet wavelet for wavelet transformation. The Morrit wavelet equation can be expressed by the following equation.

The wavelet group formula derived from the wavelet of Equation 1 may be expressed as follows.

Here, a is a scale factor for adjusting the height and width of the wavelet waveform, and b is a position factor for horizontally moving the wavelet waveform. The wavelet transform is continuously performed on the arbitrary signal s (t) using Equation 1 and Equation 2 as follows.

In the actual system, since the coil voltage is sampled at 0.56 msec, Equation 3 is transformed into a discrete equation, which is the same as the cross correlation between the coil voltage signal and the wavelet group equation. Continuous Wavelet Transform (CWT) through cross correlation of two signals is as follows.

In Equation 4, it can be seen that the wavelet group having a positional factor b of 0 in Equation 2 is used in the cross-correlation equation. Now, the wavelet transform result of an arbitrary signal will be described to reflect the frequency information of the corresponding signal.

의 라디안 주파수는

이고 따라서 스케일 인자 a는

의 주파수에 반비례한다. 수학식 4의 교차상관식의 결과는 두 신호 사이의 상관 관계를 판별하는 것이므로 웨이블릿 그룹식의 스케일 인자 a를 분석 신호 주파수의 역수로 취하면 다른 스케일 인자를 가지는 웨이블릿 그룹식을 통한 교차상관 결과보다 큰 값을 가지게 된다. 따라서, 180Hz의 정상 맥동 주파수를 가지는 전압 파형을 스케일 인자를 1/180으로 설정한 웨이블릿 그룹식과 교차상관하면 어떠한 다른 스케일 인자의 결과보다 크게 나올 것이고, 상고장 발생으로 180Hz보다 작은 맥동 주파수를 가지는 비정상 전압 파형을 만났을 때는 상대적으로 작은 교차상관값을 출력할 것이다. The radian frequency of the waveform is closely related to the scale factor a. Of equation (2)

Radian frequency of

And the scale factor a is

Inversely proportional to the frequency of Since the result of the cross-correlation of Equation 4 is to determine the correlation between the two signals, taking the scale factor a of the wavelet group equation as the inverse of the analysis signal frequency, the cross-correlation result of the wavelet group equation having different scale factors It will have a large value. Therefore, cross-correlating a voltage waveform with a normal pulsation frequency of 180 Hz with the wavelet group equation with the scale factor set to 1/180 will result in greater than the result of any other scale factor, and an abnormal voltage with a pulsation frequency of less than 180 Hz due to malfunction. When a waveform is encountered, it will output a relatively small cross-correlation value.

In order to compare the 1/180 scale factor wavelet transform result and the 1/60 scale factor wavelet transform result, each result coefficient is taken 2-norm and the magnitude is compared. The reason for using 1/60 is that the voltage waveform in the event of a fault is mixed with 60 Hz pulsation, and the fault waveform is repeated every 1/60 second.

Meanwhile, FIG. 3 shows a voltage waveform 350 and a current waveform 360 of the stop tweezer coil 109 of the control rod driving device 106. As shown in FIG. The coil current setpoint changes in a certain sequence given to each coil 107, 108, 109, and the actual coil current 360 must follow this setpoint properly. The change in the current level is obtained by controlling the firing angles of the thyristors 104 in the three-phase half-wave converter 102 of the power converter 103. To raise the current level, pull the firing angle forward and call this process the maximum positive force (270,310). As the current rises to the command value, the firing angle is gradually slowed down and the state is maintained when the current reaches the command value (280 and 320). In order to lower the current level, the firing angle is delayed to the maximum and this process is called the maximum negative force (290, 330). As the current decreases to the command value, the firing angle is gradually pulled out and the state is maintained when the current reaches the command value (300, 340). When the control rod is stopped, the control rod drive shaft 114 is always held by adjusting the firing angles 260 and 340 so that a constant current flows in the stop clamping coil 109.

4 shows a coil voltage waveform when an abnormality occurs, and a phase-fall failure 380 occurs at the maximum positive force 370 or a diode operation failure 400 at the maximum negative force 390. When it occurs, the magnitude of the pulsation of the coil voltage is greatly different before and after the failure. With this in mind, it is determined whether the existing pulsation detector has a failure by changing the voltage pulsation caused by the fault. However, the fault of the power converter 103 is monitored only during the maximum positive force 370 and the maximum negative force 390 during the movement of the control rod.

FIG. 5 shows a case where a phase omission failure occurs in one or more phases at the maximum force 480 during control rod movement. First, phase-fall fault 490 occurs in one phase, and phase-fall fault 500 occurs in another phase, where both pulsation frequencies do not have 180 Hz and fluctuation occurs and C ₆₀ (530) The occurrence of a fault can be seen from the result of becoming larger than C ₁₈₀ (520).

FIG. 6 shows a case where diode operation failure occurs in one or more phases during maximum negative force 550 during control rod movement. First, in the diode operation failure 560 occurs on a one and a diode operation failure 570 occurs on the other one again, it does not have both 580, 590. The pulse frequency 180Hz for both saenggimyeo variation, C ₆₀ ( It can be seen from the result that 610 becomes larger than C ₁₈₀ (600).

FIG. 7 illustrates a case where a phase omission failure occurs in one or more phases in the three-phase half-wave converter 102 for the stop tweezer coil 109 in the control rod stop state 620. First just dropped phases over a certain rim failure 630 occurs and saenggimyeo the oversight fault 640 does not have a pulse frequency 180Hz in both 650, 660 for the generation variation on an other one again C ₆₀ ( The occurrence of a fault can be seen from the result that 680 becomes larger than C ₁₈₀ 670.

FIG. 8 shows the results when a diode operation failure occurs in the three-phase half-wave converter 102 for the stop tipper coil in the control rod stop state 690. First, in the diode operation failure 700 occurs on a one and a diode operation failure 710 occurs on the other one again, and both 720, 730, Ie, the variation does not have a pulse frequency 180Hz for both C ₆₀ (750 The failure occurrence can be seen from the result of larger than C ₁₈₀ (740).

FIG. 9 illustrates a case in which diode operation failures 770 and 780 occur in the control rod stop state 760 when the frequency of the input power source 101 is not exactly 60 Hz and fluctuates. Since wavelet 790 with 1/180 scale factor is much more similar to normal waveform than wavelet 800 with 1/60 scale factor, C ₁₈₀ (810) is larger than C ₆₀ (820) during normal operation, Conversely, C ₆₀ (820) is larger than C ₁₈₀ (810) because wavelet 800 using the 1/60 scale factor is more similar to the fault waveform. Therefore, the method according to the present invention simply compares the two results of the conversion process having a large value with respect to the fault waveform and the conversion process having a large value with respect to the fault waveform even if the input power frequency fluctuates, so that the fault detection performance is not affected. Will not.

As described above, the failure detection device and method of the power converter of the control rod control system of the reactor according to the present invention implements the monitoring function for the failure of the power converter in software, compared to the existing analog pulsation detector efficiency or simplicity In order to achieve higher performance and better performance, wavelet transforms can be used to detect faults more quickly and accurately in a relatively simple manner. In addition, by constantly monitoring the fault of the power converter over the entire area of the current control, it is possible to overcome the disadvantage of the pulsation detector with the limitation of the temporary failure detection, thereby preventing the uninterrupted shutdown of the power plant due to the failure, As a result, there is an advantage of further improving the utilization rate of nuclear power plants.

Claims (4)

The power conversion unit 103 of the control rod control system of the nuclear reactor, the control rod drive device 106 and the main control unit 125 that collectively controls the control rod control system are installed so as to be electrically connected to each other, and whether the power conversion unit 103 is broken. In a device for detecting: Input the current of each coil (107, 108, 109) of the control rod drive device 106 detected through the current transformer 116 and the DC voltage of each coil (107, 108, 109) of the control rod drive device 106 detected through the transformer 115. A signal processor 118 that receives and adjusts the low frequency filtering scale; An analog-digital converter 119 which receives an analog signal output from the signal processor 118 and converts the analog signal into a digital signal and outputs the digital signal; The failure of the power converter 103 is detected by a failure detection method using wavelet conversion by receiving the digital data output from the analog-digital converter 119 and driving the control rod from the main controller 125. A central processing unit (120) for receiving a control command related to the operation of the device (106) to control the power supply for the control rod drive device (106) to perform a desired operation; A field-programmable gate array (FPGA) 121 for receiving a digital signal output from the analog-digital converter 119 and implementing digital logic related to the detection of failure of the power converter 103; A digital-analog converter 122 which receives the digital signal output through the FPGA 121 and converts the digital signal into an analog signal and outputs the analog signal; A memory 123 for storing a variety of data and software programs related to signal processing in the central processing unit 120 and digital logic implementation in the FPGA 121; And Control rod control of the reactor, characterized in that it comprises a timer counter 124 for counting and outputting the power supply control-related command signal from the central processing unit 120 output through the FPGA 121 at a predetermined time interval. Failure detection device of the power conversion unit of the system. delete a) storing a plurality of voltage data sampled at predetermined time intervals of each coil of the control rod driving apparatus of the reactor to obtain voltage data for a predetermined time; b) wavelet transforming the voltage data obtained in step a) by setting the scale factor to 1/180, and storing the representative value C ₁₈₀ having 2-norm as a result of the coefficient values; c) wavelet transforming the voltage data obtained in step a) by setting the scale factor to 1/60, and storing the representative value C ₆₀ having 2-norm as a result of the coefficient values; d) whether the wavelet transform coefficient representative value C ₁₈₀ for the scale factor 1/180 taken in step b) is greater than the wavelet transform coefficient representative value C ₆₀ for the scale factor 1/60 taken in step c). Determining; e) determining that the power converter is in normal operation if C ₁₈₀ is greater than C _{60 as a} result of the determination in step d); f) if it is determined in step d) that C ₁₈₀ is less than or equal to C ₆₀ , determining that a failure has occurred in the power conversion unit; And g) a method of detecting a failure of the power converter of the control rod control system of a nuclear reactor, the method comprising notifying a failure of the power converter to various display devices. delete

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