Method and device for monitoring communication gateway of steam turbine control system

Abstract

The invention relates to a turbine control system communication gateway monitoring method and device. The method comprises the following steps: S10, outputting an initial monitoring signal to an input end of a communication gateway to be monitored based on a set waveform type; wherein the set waveform types comprise square waves and triangular waves; s20, judging whether a feedback monitoring signal fed back by the output end of the communication gateway is obtained or not based on the waveform type of the initial monitoring signal, if yes, executing S30, and if not, executing S40; s30, analyzing and processing the feedback monitoring signal based on the waveform type of the initial monitoring signal to determine whether the communication gateway is abnormal or not according to the analysis and processing result, if yes, executing S40, and if not, returning to S10; and S40, outputting an authority switching signal capable of switching the steam turbine control authority from the DCS system to the TCS system. According to the invention, unexpected shutdown of the steam turbine due to abnormal communication gateway can be avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear power plant equipment monitoring, and in particular to a method and a device for monitoring a communication gateway of a steam turbine control system. Background Art

[0002] In nuclear power plants, the main function of the turbine control system (TCS system) is to adjust the steam inlet of the turbine to implement power control, frequency control, and pressure control on the unit, and to implement overspeed limit, load limit, and steam flow limit control on the load and speed of the unit, so that the unit can operate safely and economically in various working conditions. The distributed control system (DCS system) establishes a communication connection with the TCS system through a communication gateway to achieve data transmission, thereby realizing parameter monitoring and control command operation of the turbine, that is, the actual control authority of the turbine is in the DCS system when it is operating normally.

[0003] When the communication gateway fails, the DCS system loses connection with the TCS system, causing the DCS system to be unable to monitor the steam turbine. Although the nuclear power plant is equipped with protection control for this situation, the current solution is to obtain messages from the communication gateway through the controller regularly. When the controller on the TCS system side does not receive data from the DCS system for a certain period of time (generally 20 seconds), it will determine that the communication gateway is faulty, and then switch the turbine control authority from the DCS system to the TCS system after a certain delay. Although the controller has the function of freezing the turbine control instructions, the time required from the communication gateway failure to the control authority switching is too long, so some important control instructions of the steam turbine (such as target load value, steam flow instruction, high-pressure cylinder control valve limit instruction, etc.) are assigned "0", initial value and other inappropriate values, resulting in unexpected shutdown of the steam turbine. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a method and device for monitoring a communication gateway of a steam turbine control system.

[0005] The technical solution adopted by the present invention to solve the technical problem is: constructing a steam turbine control system communication gateway monitoring method, comprising:

[0006] S10, outputting an initial monitoring signal to an input end of the communication gateway to be monitored based on a set waveform type; wherein the set waveform type includes a square wave and a triangle wave;

[0007] S20, judging whether the feedback monitoring signal fed back from the output end of the communication gateway is obtained based on the waveform type of the initial monitoring signal, if so, executing S30, otherwise executing S40;

[0008] S30, analyzing and processing the feedback monitoring signal based on the waveform type of the initial monitoring signal, so as to determine whether the communication gateway is abnormal according to the result of the analysis and processing, and if so, executing S40, otherwise returning to S10;

[0009] S40: Output an authority switching signal capable of switching the steam turbine control authority from the DCS system to the TCS system.

[0010] Preferably, the S10 includes:

[0011] When the set waveform type is a square wave, an initial monitoring signal of a square wave is output to the input end of the communication gateway to be monitored based on a set period;

[0012] When the set waveform type is a triangular wave, an initial monitoring signal of a triangular wave is continuously output to the input end of the communication gateway to be monitored.

[0013] Preferably, in S30, the step of analyzing and processing the feedback monitoring signal based on the waveform type of the initial monitoring signal includes:

[0014] When the waveform type of the initial monitoring signal is a square wave, performing interval analysis processing on the feedback monitoring signal;

[0015] When the waveform type of the initial monitoring signal is a triangular wave, a waveform analysis process is performed on the feedback monitoring signal.

[0016] Preferably, the interval analysis process comprises:

[0017] Calculating the time interval between the acquisition time of the feedback monitoring signal and the output time of the initial monitoring signal, and generating an analysis result based on the time interval;

[0018] In S30, the step of determining whether the communication gateway is abnormal according to the result of the analysis process includes:

[0019] It is determined whether the time interval is greater than a first set time, if so, the communication gateway is determined to be abnormal, otherwise, the communication gateway is determined to be normal.

[0020] Preferably, the first set time ranges from 5 to 12 seconds.

[0021] Preferably, the waveform analysis process includes:

[0022] Performing a derivative operation on the feedback monitoring signal to obtain derivatives corresponding to when the feedback monitoring signal presents an upward trend and a downward trend, respectively, to obtain a first derivative and a second derivative;

[0023] Obtaining the pre-stored derivatives corresponding to the initial monitoring signal when it is in an upward and downward trend, respectively, to obtain a third derivative and a fourth derivative;

[0024] respectively calculating a first ratio of the first derivative to the third derivative and a second ratio of the second derivative to the fourth derivative;

[0025] After a delay of a second set time, generating an analysis result based on the first ratio and the second ratio;

[0026] In S30, the step of determining whether the communication gateway is abnormal according to the result of the analysis process includes:

[0027] It is determined whether the first ratio and the second ratio are less than a set threshold value respectively, and when the first ratio or the second ratio is less than the set threshold value, it is determined that the communication gateway is abnormal.

[0028] Preferably, the set threshold value ranges from 0.4 to 0.8.

[0029] The present invention also constructs a steam turbine control system communication gateway monitoring device, comprising:

[0030] A monitoring signal generating unit, used for outputting an initial monitoring signal to an input end of a communication gateway to be monitored based on a set waveform type; wherein the set waveform type includes a square wave and a triangle wave;

[0031] A judging unit, configured to judge whether a feedback monitoring signal fed back from an output end of the communication gateway is obtained based on a waveform type of the initial monitoring signal;

[0032] an analysis unit, configured to analyze and process the feedback monitoring signal based on the waveform type of the initial monitoring signal when the feedback monitoring signal is acquired, so as to determine whether the communication gateway is abnormal according to the result of the analysis and processing;

[0033] The switching signal generating unit is used to output an authority switching signal capable of switching the steam turbine control authority from the DCS system to the TCS system when the feedback monitoring signal is not obtained or the communication gateway is abnormal.

[0034] Preferably, the analysis unit comprises:

[0035] An interval analysis unit, configured to perform the interval analysis process;

[0036] Wherein, the interval analysis unit comprises:

[0037] A timing unit, used to calculate the time interval between the acquisition time of the feedback monitoring signal and the output time of the initial monitoring signal;

[0038] The first sub-judgment unit is used to determine that the communication gateway is abnormal when the time interval is greater than a first set time, and to determine that the communication gateway is normal when the time interval is not greater than the first set time.

[0039] Preferably, the analysis unit comprises:

[0040] A similarity analysis unit, used to perform the waveform analysis process;

[0041] Wherein, the similarity analysis unit comprises:

[0042] A derivation unit, used for performing a derivation operation on the feedback monitoring signal;

[0043] A trend analysis unit, used to cooperate with the derivation unit to obtain derivatives corresponding to the upward and downward trends of the feedback monitoring signal, respectively, to obtain a first derivative and a second derivative;

[0044] an absolute value unit, used to calculate the absolute values ​​of the first derivative and the second derivative to obtain a first absolute value and a second absolute value;

[0045] The second sub-judgment unit is used to obtain the absolute values ​​of the derivatives corresponding to the pre-stored initial monitoring signal when it shows an upward and downward trend, respectively, to obtain a third absolute value and a fourth absolute value, to calculate a first ratio of the first absolute value to the third absolute value and a second ratio of the second absolute value to the fourth absolute value, and after a delay of a second set time, to judge whether the first ratio and the second ratio are less than a set threshold value, respectively; when the first ratio or the second ratio is less than the set threshold value, the communication gateway is determined to be abnormal.

[0046] The implementation of the present invention has the following beneficial effects: providing a method for monitoring a communication gateway of a steam turbine control system; firstly, inputting an initial monitoring signal of a set waveform type into the communication gateway of the communication gateway to be monitored; then analyzing and processing the obtained feedback monitoring signal to determine whether the communication gateway is abnormal according to the result of the analysis and processing; when no feedback monitoring signal is received or the communication gateway is determined to be abnormal according to the result of the analysis and processing, outputting an authority switching signal to switch the control authority of the steam turbine from the DCS system to the TCS system, so that when an abnormality occurs in the communication gateway, the TCS system can take over the control of the steam turbine in time, avoiding unexpected shutdown of the steam turbine due to abnormality of the communication gateway, thereby improving the stability and economic benefits of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0048] Figure 1is a program flow chart of a method for monitoring a communication gateway of a steam turbine control system in some embodiments of the present invention;

[0049] Figure 2 is a communication link diagram of a communication gateway, a TCS system, and a DCS system in some embodiments of the present invention;

[0050] Figure 3 is a waveform diagram when the initial monitoring signal is a square wave in some embodiments of the present invention;

[0051] Figure 4 is a waveform diagram when the initial monitoring signal is a triangular wave in some embodiments of the present invention;

[0052] Figure 5 is a schematic diagram of the structure of a communication gateway monitoring device for a steam turbine control system in some embodiments of the present invention;

[0053] Figure 6 is a schematic diagram of the structure of an interval analysis unit in some embodiments of the present invention;

[0054] Figure 7 Schematic diagram of the structure of a similarity analysis unit in some embodiments of the present invention. DETAILED DESCRIPTION

[0055] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0056] It should be noted that the flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor do they have to be executed in the order described. For example, some operations / steps can be decomposed, while some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0057] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities may be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and processor devices and microcontroller devices.

[0058] like Figure 1 As shown, the present invention provides a method for monitoring a communication gateway of a steam turbine control system, which can detect the communication gateway of the steam turbine control system, and when an abnormality is found in the communication loop of the communication gateway, timely generate an authority switching signal to avoid unexpected shutdown of the steam turbine due to abnormality of the communication gateway. The method for monitoring the communication gateway of the steam turbine control system may include step S10, step S20, step S30 and step S40.

[0059] Step S10 includes: outputting an initial monitoring signal to the input end of the communication gateway to be monitored based on a set waveform type; wherein the set waveform type includes a square wave and a triangle wave. In this embodiment, the initial monitoring signal will be input into the communication gateway of the communication gateway to be monitored as a life signal, in preparation for the subsequent step of determining whether the communication gateway is abnormal.

[0060] In some embodiments, step S10 may include: when the waveform type is set to a square wave, outputting an initial monitoring signal as a square wave to the input end of the communication gateway to be monitored based on a set period; when the waveform type is set to a triangle wave, continuously outputting an initial monitoring signal as a triangle wave to the input end of the communication gateway to be monitored. Optionally, when the initial monitoring signal is a square wave, its set period may be 2 seconds, and its duty cycle may be 50%. For specific waveforms, please refer to Figure 3 When the initial monitoring signal is a triangular wave, the triangular wave may be an isosceles triangular wave, and each triangular wave is connected end to end, and its period may be 1 second. For specific waveforms, please refer to Figure 4 It should be noted that the frequency of the data (recorded as normal communication signal) used by the communication gateway to realize normal communication interaction between the TCS system and the DCS system is as high as 1000Hz, while the period of the initial monitoring signal superimposed on the communication gateway is more than 1 second (i.e., the frequency is less than 1Hz). The frequency difference between the two is obvious, and the normal communication signal and the feedback monitoring signal can be easily separated by a frequency divider so that the two do not affect each other. Of course, algorithms such as Fourier transform or wavelet packet decomposition can also be used to separate the feedback monitoring signal and the normal communication signal.

[0061] Step S20 includes: determining whether a feedback monitoring signal fed back from the output end of the communication gateway is obtained based on the waveform type of the initial monitoring signal, and if so, executing step S30, otherwise executing step S40.

[0062] See also Figure 2 , the communication gateway includes a first sub-communication gateway and / or a second sub-communication gateway, wherein the first sub-communication gateway includes a first gateway COM66A / B and a second gateway COM1047A / B, and the second sub-communication gateway includes a third gateway COM65A / B and a fourth gateway COM1046A / B. It should be noted that the output end of the communication gateway refers to the signal output end of one of the gateways included in the communication gateway, and the input end of the communication gateway refers to the signal input end of the gateway included in the communication gateway. Taking the first sub-communication gateway as an example, if the input end of the first gateway COM66A / B is set as the input end of the communication gateway, then the output end of the first gateway COM66A / B corresponds to the output end of the communication gateway. Similarly, if the input end of the second gateway COM1047A / B is set as the input end of the communication gateway, then the output end of the second gateway COM1047A / B corresponds to the output end of the communication gateway.

[0063] More specifically, in some embodiments, step S20 may include: when the initial monitoring signal is a square wave, determining whether a feedback monitoring signal having a waveform shape similar to a square wave is obtained within a set period, and if so, executing step S30, otherwise executing step S40; when the initial monitoring signal is a triangular wave, determining whether a real-time feedback monitoring signal having a waveform shape similar to a triangular wave is obtained, and if so, executing step S30, otherwise executing step S40.

[0064] It should be noted that since the initial monitoring signal will be affected by the circuit stray capacitance, stray inductance and resistance during the propagation process of the communication gateway, its waveform will be distorted to varying degrees. Therefore, it is normal for the waveform of the feedback monitoring signal to be slightly different from the theoretical waveform of the square wave or triangle wave. However, under normal circumstances of the communication gateway, the waveform shapes of the feedback monitoring signal and the initial monitoring signal are theoretically very similar.

[0065] In some embodiments, the following steps can be performed to determine whether the waveform shape of the feedback monitoring signal is similar to a square wave: monitor the voltage change at the output end of the communication gateway, start timing when a rising edge signal is detected, and stop timing when a falling edge is detected, and determine that the timing time is within a second set time range. If so, it is determined that the waveform shape of the feedback monitoring signal is similar to a square wave. In addition, the second set time range can be 0.9*T1*D1 to 1.1*T1*D1, where T1 represents the set period of the initial monitoring signal and D1 represents the duty cycle of the initial monitoring signal.

[0066] In some embodiments, the following steps can be performed to determine whether the waveform shape of the feedback monitoring signal is similar to a triangular wave: monitor the voltage change at the output end of the communication gateway, generate a voltage change curve based on the voltage change, and analyze the change trend of the voltage change curve to determine whether the voltage change curve is similar to a sine wave that continuously changes between increasing and decreasing in a cycle. If so, it is determined that the waveform shape of the feedback monitoring signal is similar to a triangular wave.

[0067] Step S30 includes: analyzing and processing the feedback monitoring signal based on the waveform type of the initial monitoring signal to determine whether the communication gateway is abnormal based on the results of the analysis and processing, and if so, executing step S40, otherwise returning to S10; wherein the analysis and processing includes interval analysis processing that can determine the time interval between the initial monitoring signal and the feedback monitoring signal and waveform analysis processing that can compare the waveform similarity between the initial monitoring signal and the feedback monitoring signal.

[0068] In some embodiments, the step of analyzing and processing the feedback monitoring signal based on the waveform type of the initial monitoring signal may include: when the waveform type of the initial monitoring signal is a square wave, performing interval analysis processing on the feedback monitoring signal; when the waveform type of the initial monitoring signal is a triangle wave, performing waveform analysis processing on the feedback monitoring signal.

[0069] In some embodiments, the interval analysis process may include: calculating the time interval between the acquisition time of the feedback monitoring signal and the output time of the initial monitoring signal, and generating an analysis result based on the time interval. Accordingly, the step of determining whether the communication gateway is abnormal based on the result of the analysis process may include: determining whether the time interval is greater than a first set time, if so, determining that the communication gateway is abnormal, otherwise determining that the communication gateway is normal.

[0070] In this embodiment, when the time interval is not greater than the first set time, it means that the square wave can be completely transmitted in the communication gateway, so the communication gateway is judged to be normal. When the time interval is greater than the first set time, it means that the communication gateway can no longer meet the communication requirements between the DCS system and the TCS system, and the main reasons for this abnormality include: 1. The monitored communication gateway has cable disconnection, poor contact, aging, etc.; 2. The communication gateway is stuck and down, etc.

[0071] Optionally, the first set time ranges from 5 to 12 seconds. It should be noted that a low degree of jamming of the communication gateway during operation will not affect the communication between the DCS system and the TCS system, so the first set time can be set according to actual needs, preferably, the first set time can be set to 10 seconds.

[0072] In some embodiments, the waveform analysis process may include: performing a derivative operation on the feedback monitoring signal to obtain the derivatives corresponding to the feedback monitoring signal when it is in an upward and downward trend, respectively, to obtain a first derivative (corresponding to the derivative when the feedback monitoring signal is in an upward trend) and a second derivative (corresponding to the derivative when the feedback monitoring signal is in a downward trend); obtaining the derivatives corresponding to the pre-stored initial monitoring signal when it is in an upward and downward trend, respectively, to obtain a third derivative (corresponding to the derivative when the initial monitoring signal is in an upward trend) and a fourth derivative (corresponding to the derivative when the initial monitoring signal is in a downward trend); calculating a first ratio of the first derivative to the third derivative, and calculating a second ratio of the second derivative to the fourth derivative; after a delay of a second set time, generating an analysis result based on the first ratio and the second ratio. Accordingly, the step of determining whether the communication gateway is abnormal according to the result of the analysis process may include: respectively judging whether the first ratio and the second ratio are less than a set threshold, determining that the communication gateway is abnormal when the first ratio or the second ratio is less than the set threshold, and determining that the communication gateway is normal when both the first ratio and the second ratio are not less than the set threshold.

[0073] In this embodiment, the feedback monitoring signal is a triangular wave or a voltage waveform similar to a triangular wave, so the feedback monitoring signal will change cyclically between increasing and decreasing similar to a sine wave, so when the feedback monitoring signal is derivatized, a positive derivative (corresponding to the derivative when the feedback monitoring signal is on an upward trend) and a negative derivative (corresponding to the derivative when the feedback monitoring signal is on a downward trend) will be obtained. When the first ratio or the second ratio is not less than the set threshold, it means that the feedback monitoring signal and the initial monitoring signal are relatively similar, and the triangular wave distortion is within a reasonable range, so it can be determined that the communication gateway is normal. When one of the first ratio or the second ratio is less than the set threshold, it means that the communication gateway can no longer meet the communication requirements between the DCS system and the TCS system, and the main reasons for this abnormality include: 1. The communication gateway to be monitored has cable disconnection, poor contact, aging, etc.; 2. The communication gateway is stuck and downtime, etc.

[0074] Taking into account that the triangular wave may be distorted during transmission, making it difficult for the waveform of the feedback monitoring signal to present a regular triangular wave shape, in some embodiments, before performing the derivation operation, the following steps may be included: performing curve fitting on the feedback monitoring signal based on the least squares method, support vector regression algorithm, etc. to obtain a fitting curve, and performing a derivation operation on the fitting curve to obtain the first derivative and the second derivative.

[0075] Optionally, the threshold value may be set in the range of 0.4 to 0.8, and the threshold value is preferably set to 0.5.

[0076] Step S40 includes: outputting an authority switching signal capable of switching the steam turbine control authority from the DCS system to the TCS system. In this step, when the steam turbine control authority is switched from the DCS system to the TCS system, the TCS system will be able to directly control the operation of the steam turbine, so that when an abnormality occurs in the communication gateway, the TCS system can take over the control of the steam turbine in time, avoiding unexpected shutdown of the steam turbine due to abnormality of the communication gateway, thereby improving the stability and economic benefits of the unit.

[0077] It should be noted that, for some situations including more than two sub-communication gateways (multiple sub-communication gateways are mainly to comply with the principle of redundant design), the permission switching signal will only be output when all sub-communication gateways are determined to be abnormal. As for the specific method of determining whether each sub-communication gateway is abnormal, please refer to steps S10 to S30 provided in the embodiment of the present invention, which will not be repeated here.

[0078] like Figure 5 As shown, the present invention further provides a steam turbine control system communication gateway monitoring device, which may include a monitoring signal generating unit 1, a judging unit 2, an analyzing unit 3 and a switching signal generating unit 4.

[0079] The monitoring signal generating unit 1 is used to output an initial monitoring signal to the input end of the communication gateway to be monitored based on a set waveform type; wherein the set waveform type includes a square wave and a triangular wave. It should be noted that the monitoring signal generating unit 1 can be an existing waveform generating circuit or module, which can output a square wave with a set period and duty cycle, or a triangular wave with a certain frequency.

[0080] The judgment unit 2 is connected to the monitoring signal generating unit 1, and the judgment unit 2 is used to judge whether the feedback monitoring signal fed back from the output end of the communication gateway is obtained based on the waveform type of the initial monitoring signal. It should be noted that the method for judging whether the feedback monitoring signal is obtained can refer to the method provided in the above embodiment, which will not be repeated here.

[0081] The analysis unit 3 is connected to the judgment unit 2. The analysis unit 3 is used to analyze and process the feedback monitoring signal based on the waveform type of the initial monitoring signal when the feedback monitoring signal is obtained, so as to determine whether the communication gateway is abnormal according to the result of the analysis and processing; wherein the analysis and processing includes interval analysis processing that can determine the time interval between the initial monitoring signal and the feedback monitoring signal and waveform analysis processing that can compare the waveform similarity between the initial monitoring signal and the feedback monitoring signal.

[0082] In order to avoid the normal communication signal and the feedback monitoring signal, in some embodiments, the steam turbine control system communication gateway monitoring device further includes a frequency division unit. The frequency division unit is connected between the judgment unit 2 and the communication gateway to separate the normal communication signal and the feedback monitoring signal according to the corresponding frequency. The frequency division unit can be an existing frequency divider.

[0083] In some embodiments, the analysis unit 3 comprises an interval analysis unit for performing an interval analysis process.

[0084] Furthermore, if Figure 6 As shown, the interval analysis unit may include a timing unit 311 and a first sub-determination unit 312 .

[0085] The timing unit 311 is used to calculate the time interval between the acquisition time of the feedback monitoring signal and the output time of the initial monitoring signal.

[0086] In some embodiments, Figure 6 As shown, the timing unit 311 may include a rising edge detection unit 3111 , a first constant setting module 3112 , a second constant setting module 3113 and a counter 3114 .

[0087] The rising edge detection unit 3111 is connected to the frequency division unit to output a timing signal when a rising edge of the feedback monitoring signal is detected.

[0088] The counter 3114 is connected to the rising edge detection unit 3111 to start timing when receiving the timing signal, and output a time interval signal that can indicate the time interval to the first sub-determination unit 312 .

[0089] The first constant setting module 3112 and the second constant setting module 3113 are respectively connected to the counter 3114 to output corresponding constants to the counter 3114. The constant output by the first constant setting module 3112 is used to set the counting cycle of the counter 3114, and the constant output by the second constant setting module 3113 is used to set the step of each counting of the counter 3114 (i.e., the value increased by the counter in each counting cycle).

[0090] The first sub-determination unit 312 is used to determine that the communication gateway is abnormal when the time interval is greater than a first set time, and to determine that the communication gateway is normal when the time interval is not greater than the first set time.

[0091] In some embodiments, the analyzing unit 3 may further include a similarity analyzing unit for performing waveform analysis processing.

[0092] Furthermore, if Figure 7 As shown, the similarity analysis unit may include a derivation unit 321 , a trend analysis unit 322 , an absolute value unit 323 , a second sub-judgment unit 324 and a second sub-judgment unit 324 .

[0093] The derivation unit 321 is used to perform a derivation operation on the feedback monitoring signal.

[0094] In some embodiments, the derivation unit 321 may also perform curve fitting on the feedback monitoring signal based on the least squares method to obtain a fitting curve, and then perform a derivation operation on the fitting curve to obtain a derivative of the fitting curve. Specifically, when the feedback monitoring signal is a triangular wave or a waveform signal similar to a triangular wave, the derivative of the fitting curve may be expressed as: Where f(t) represents the derivative, Indicates the timing from 0 to The derivative corresponding to the period, Indicates the timing The derivative corresponding to the period from t to T, where T represents the period of the fitting curve.

[0095] The trend analysis unit 322 is used to cooperate with the derivation unit 321 to obtain the derivatives corresponding to the feedback monitoring signal when it is in an upward and downward trend, respectively, to obtain the first derivative and the second derivative. Specifically, the function of the trend analysis unit 322 is to respectively determine whether the two derivatives output by the derivation unit 321 are greater than 0, and determine the derivative greater than 0 as the first derivative, and determine the derivative not greater than 0 as the second derivative.

[0096] The absolute value unit 323 is used to calculate the absolute values ​​of the first derivative and the second derivative to obtain a first absolute value (corresponding to the absolute value of the first derivative) and a second absolute value (corresponding to the absolute value of the second derivative).

[0097] The second sub-judgment unit 324 is used to obtain the absolute values ​​of the derivatives corresponding to the pre-stored initial monitoring signal when it shows an upward and downward trend, respectively, to obtain a third absolute value (corresponding to the absolute value of the derivative when the initial monitoring signal shows an upward trend) and a fourth absolute value (corresponding to the absolute value of the derivative when the initial monitoring signal shows a downward trend), calculate a first ratio of the first absolute value to the third absolute value and a second ratio of the second absolute value to the fourth absolute value, and after a delay of a second set time, determine whether the first ratio and the second ratio are less than a set threshold value; when the first ratio and the second ratio are less than the set threshold value, determine that the communication gateway is abnormal.

[0098] The switching signal generating unit 4 is used to output an authority switching signal capable of switching the steam turbine control authority from the DCS system to the TCS system when no feedback monitoring signal is obtained or the communication gateway is abnormal.

[0099] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0100] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0101] The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0102] It can be understood that the above embodiments only express the preferred implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the present invention. It should be pointed out that, for ordinary technicians in this field, the above technical features can be freely combined without departing from the concept of the present invention, and several deformations and improvements can be made, which all belong to the protection scope of the present invention. Therefore, all equivalent changes and modifications made to the scope of the claims of the present invention should belong to the coverage of the claims of the present invention.

Claims

1. A method for monitoring a communication gateway of a steam turbine control system, characterized in that: include: S10, outputting an initial monitoring signal to an input end of the communication gateway to be monitored based on a set waveform type; wherein the set waveform type includes a square wave and a triangle wave; S20, judging whether the feedback monitoring signal fed back from the output end of the communication gateway is obtained based on the waveform type of the initial monitoring signal, if so, executing S30, otherwise executing S40; S30, analyzing and processing the feedback monitoring signal based on the waveform type of the initial monitoring signal, so as to determine whether the communication gateway is abnormal according to the result of the analysis and processing, and if so, executing S40, otherwise returning to S10; S40: Output an authority switching signal capable of switching the steam turbine control authority from the DCS system to the TCS system.

2. The method for monitoring a communication gateway of a steam turbine control system according to claim 1, characterized in that: The S10 includes: When the set waveform type is a square wave, an initial monitoring signal of a square wave is output to the input end of the communication gateway to be monitored based on a set period; When the set waveform type is a triangular wave, an initial monitoring signal of a triangular wave is continuously output to the input end of the communication gateway to be monitored.

3. The method for monitoring a communication gateway of a steam turbine control system according to claim 2, characterized in that: In the S30, the step of analyzing and processing the feedback monitoring signal based on the waveform type of the initial monitoring signal includes: When the waveform type of the initial monitoring signal is a square wave, performing interval analysis processing on the feedback monitoring signal; When the waveform type of the initial monitoring signal is a triangular wave, a waveform analysis process is performed on the feedback monitoring signal.

4. The method for monitoring a communication gateway of a steam turbine control system according to claim 3, characterized in that: The interval analysis process includes: Calculating the time interval between the acquisition time of the feedback monitoring signal and the output time of the initial monitoring signal, and generating an analysis result based on the time interval; In S30, the step of determining whether the communication gateway is abnormal according to the result of the analysis process includes: It is determined whether the time interval is greater than a first set time, if so, the communication gateway is determined to be abnormal, otherwise, the communication gateway is determined to be normal.

5. The method for monitoring a communication gateway of a steam turbine control system according to claim 4, characterized in that: The first set time ranges from 5 to 12 seconds.

6. The method for monitoring a communication gateway of a steam turbine control system according to claim 3, characterized in that: The waveform analysis process includes: Performing a derivative operation on the feedback monitoring signal to obtain derivatives corresponding to when the feedback monitoring signal presents an upward trend and a downward trend, respectively, to obtain a first derivative and a second derivative; Obtaining the pre-stored derivatives corresponding to the initial monitoring signal when it is in an upward and downward trend, respectively, to obtain a third derivative and a fourth derivative; respectively calculating a first ratio of the first derivative to the third derivative and a second ratio of the second derivative to the fourth derivative; After a delay of a second set time, generating an analysis result based on the first ratio and the second ratio; In S30, the step of determining whether the communication gateway is abnormal according to the result of the analysis process includes: It is determined whether the first ratio and the second ratio are less than a set threshold value respectively, and when the first ratio or the second ratio is less than the set threshold value, it is determined that the communication gateway is abnormal.

7. The method for monitoring a communication gateway of a steam turbine control system according to claim 3, characterized in that: The set threshold value ranges from 0.4 to 0.

8.

8. A steam turbine control system communication gateway monitoring device, characterized in that: include: A monitoring signal generating unit (1) is used to output an initial monitoring signal to an input end of a communication gateway to be monitored based on a set waveform type; wherein the set waveform type includes a square wave and a triangle wave; A judgment unit (2) is used to judge whether a feedback monitoring signal fed back from the output end of the communication gateway is obtained based on the waveform type of the initial monitoring signal; An analysis unit (3) is used to analyze and process the feedback monitoring signal based on the waveform type of the initial monitoring signal when the feedback monitoring signal is acquired, so as to determine whether the communication gateway is abnormal according to the result of the analysis and processing; The switching signal generating unit (4) is used to output an authority switching signal capable of switching the steam turbine control authority from the DCS system to the TCS system when the feedback monitoring signal is not obtained or the communication gateway is abnormal.

9. The steam turbine control system communication gateway monitoring device according to claim 8, characterized in that: The analysis unit (3) comprises: An interval analysis unit, configured to perform the interval analysis process; Wherein, the interval analysis unit comprises: A timing unit (311), used for calculating the time interval between the acquisition time of the feedback monitoring signal and the output time of the initial monitoring signal; The first sub-judgment unit (312) is used to determine that the communication gateway is abnormal when the time interval is greater than a first set time, and to determine that the communication gateway is normal when the time interval is not greater than the first set time.

10. The steam turbine control system communication gateway monitoring device according to claim 8, characterized in that: The analysis unit (3) comprises: A similarity analysis unit, used to perform the waveform analysis process; Wherein, the similarity analysis unit comprises: A derivation unit (321), used for performing a derivation operation on the feedback monitoring signal; A trend analysis unit (322) is used to cooperate with the derivation unit (321) to obtain derivatives corresponding to when the feedback monitoring signal presents an upward trend or a downward trend, respectively, to obtain a first derivative and a second derivative; An absolute value unit (323), used for calculating the absolute values ​​of the first derivative and the second derivative to obtain a first absolute value and a second absolute value; The second sub-judgment unit (324) is used to obtain the absolute values ​​of the derivatives corresponding to the pre-stored initial monitoring signal when it shows an upward and downward trend, respectively, to obtain a third absolute value and a fourth absolute value, calculate a first ratio of the first absolute value to the third absolute value and a second ratio of the second absolute value to the fourth absolute value, and after a delay of a second set time, respectively judge whether the first ratio and the second ratio are less than a set threshold value, and when the first ratio or the second ratio is less than the set threshold value, determine that the communication gateway is abnormal.

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