Thermal power plant unit state evaluation method and evaluation system

Abstract

The invention belongs to the technical field of thermal power plant unit evaluation, and provides a thermal power plant unit state evaluation method and system, a thermal power plant unit is divided, a plurality of equipment groups are obtained, operation data of each equipment group are obtained, the operation data comprise an actual power value, the actual power value of each equipment group is processed, and the actual power value of each equipment group is calculated. The method comprises the steps of obtaining an abnormal power time period, obtaining abnormal duration time and an abnormal deviation value based on the abnormal power time period, obtaining an abnormal duration proportion and an abnormal degree coefficient respectively, processing the abnormal duration proportion and the abnormal degree coefficient to obtain a unit state value, comparing the unit state value with a threshold value, and if the unit state value is larger than the unit state threshold value, determining that the unit state value is larger than the unit state threshold value. And if yes, generating a unit state unstable signal, thereby comprehensively evaluating the operation state of the thermal power plant unit by analyzing the abnormal time and the abnormal degree of each equipment group in the thermal power plant unit.

Description

Technical Field

[0001] The invention belongs to the technical field of thermal power plant unit evaluation, in particular to a thermal power plant unit state evaluation method and evaluation system. Background Art

[0002] The unit status assessment of thermal power plants is specially designed for thermal power generating units. It is used to assess the real-time operating status and health of the units. It monitors multiple equipment groups within the thermal power plant units, obtains the operating data of each equipment group, and comprehensively assesses the operating status of the thermal power plant units through the operating data of multiple equipment groups.

[0003] In the prior art, an analysis and prediction model is established by utilizing historical data of different dimensions of thermal power plant units, and model training is performed. By substituting the real-time data of the thermal power plant units into the analysis and prediction model, the operating status of the thermal power plant units is evaluated in real time. However, the present application monitors the operating data of multiple equipment groups in the thermal power plant units, comprehensively evaluates the operating status of the thermal power plant units through the operating data of multiple equipment groups, selects an abnormal target equipment group from multiple abnormal equipment groups, analyzes the actual power changes of the abnormal target equipment group and other abnormal equipment groups in each monitoring time period, selects abnormal similar equipment, and then analyzes the degree of abnormality of the actual power of the abnormal target equipment group and the abnormal similar equipment group, determines that the unstable operation of the thermal power plant units is due to the actual power changes of the abnormal target equipment group, which leads to abnormal actual power of other equipment groups in the entire thermal power plant units, and solves the problem of abnormal actual power of other equipment groups in the entire thermal power plant units due to the actual power changes of the abnormal target equipment group by adjusting the actual power changes of the abnormal target equipment group.

[0004] To this end, the present invention provides a method and system for evaluating the status of a unit in a thermal power plant. Summary of the invention

[0005] In order to make up for the deficiencies of the prior art, the problem proposed in the background technology that the actual power of other equipment groups in the entire thermal power plant unit is abnormal due to the abnormal actual power change of the target equipment group is solved.

[0006] The technical solution adopted by the present invention to solve the technical problem is: a method for evaluating the status of a unit in a thermal power plant, comprising:

[0007] Step 1: Divide the thermal power plant units into multiple equipment groups, obtain the operation data of each equipment group, wherein the operation data includes the actual power value, and process the actual power value of each equipment group to obtain the abnormal power time period;

[0008] Step 2: Based on the abnormal power time period, the abnormal duration and the abnormal deviation value are obtained, and the abnormal duration ratio and the abnormal degree coefficient are obtained respectively. The abnormal duration ratio and the abnormal degree coefficient are processed to obtain the unit state value, and compared with the threshold value. If the unit state value is greater than the unit state threshold value, a unit state instability signal is generated;

[0009] Step 3: Based on the unstable unit status signal, the actual power changes of multiple abnormal device groups are obtained, the actual power changes of the multiple abnormal device groups are analyzed to obtain the abnormal target device group, and the actual power changes of the abnormal target device group are compared with the actual power changes of other abnormal device groups to obtain an abnormal synchronization value, and compared with the threshold value. If the abnormal synchronization value is greater than or equal to the abnormal synchronization threshold, an abnormal synchronization signal is generated;

[0010] Step 4: Based on the abnormal synchronization signal, obtain the adjustment coefficient and adjust the status of the thermal power plant units.

[0011] As a further solution of the present invention: the abnormal power time period is obtained in the following manner:

[0012] The thermal power plant units are divided into multiple equipment groups according to the functional type to obtain multiple equipment groups, and the actual power of each equipment group is monitored. Within the monitoring period, the monitoring period is divided into several monitoring time periods to obtain the actual power value within each monitoring time period;

[0013] The actual power in each monitoring period is compared with the standard power. The comparison process is as follows:

[0014] If the actual power in each monitoring time period is greater than or equal to the standard power, the monitoring time period is marked as a normal power time period;

[0015] If the actual power in each monitoring time period is less than the standard power, the monitoring time period is marked as an abnormal power time period.

[0016] As a further solution of the present invention: the method for obtaining the abnormal continuous ratio is:

[0017] In the monitoring period, the interval time periods between all abnormal power time periods are obtained and marked as abnormal interval time periods;

[0018] The time length values ​​corresponding to all abnormal interval time periods are added together to obtain the abnormal interval time, and the ratio of the abnormal interval time to the monitoring cycle time is calculated to obtain the abnormal duration ratio;

[0019] The abnormal duration ratios of all equipment groups in the thermal power plant units are added together and averaged to obtain the abnormal duration ratio.

[0020] As a further solution of the present invention: the abnormality degree coefficient is obtained in the following manner:

[0021] Obtain the actual power corresponding to the abnormal time period, subtract the actual power corresponding to the abnormal time period from the standard power, and take the absolute value to obtain the actual deviation value;

[0022] The actual deviation values ​​corresponding to all abnormal time periods are added together and averaged to obtain the total actual deviation value;

[0023] The actual deviation degree coefficient is obtained by calculating the ratio of the actual deviation total value to the standard power;

[0024] The actual deviation degree values ​​of all equipment groups in the thermal power plant units are summed and averaged to obtain the abnormal degree coefficient.

[0025] As a further solution of the present invention: the method for obtaining the unit status value is:

[0026] Substitute the abnormal persistence ratio and the abnormal degree coefficient into the formula: The unit status value ZT is calculated, where T y Expressed as abnormal persistence ratio, PC y It is expressed as the abnormality degree coefficient, and α and β are preset weight coefficients.

[0027] As a further solution of the present invention: the process of obtaining the abnormal target device group is as follows:

[0028] During the monitoring period, an XY axis coordinate system is established, where the X axis represents time and the Y axis represents power. The actual power in each monitoring period is substituted into the XY axis coordinate system to draw an actual power change curve.

[0029] Based on the actual power change curve, substitute the standard power into the actual power change curve, mark the Y axis, and make a standard power line parallel to the X axis, marked as the standard power line;

[0030] Select the actual power change curve segment that is lower than the standard power line and mark it as an abnormal power curve segment;

[0031] The lengths of all abnormal power curve segments are added together and the ratio is calculated with the standard power line to obtain the abnormal power curve length ratio;

[0032] The abnormal power curve length ratios corresponding to each abnormal device group are compared, and the abnormal device group corresponding to the maximum abnormal power curve length ratio is selected and marked as the abnormal target device group.

[0033] As a further solution of the present invention: the method of obtaining the abnormally similar device group is:

[0034] Marking the actual power change curve corresponding to the abnormal target device group as the abnormal target power curve;

[0035] The abnormal target power curve is divided into a plurality of abnormal target power curve segments, and the endpoints and midpoints of both ends of the abnormal target power curve segments are obtained, and are marked as the abnormal target starting point, the abnormal target focus, and the abnormal target midpoint, respectively;

[0036] The abnormal target starting point, the abnormal target midpoint and the abnormal target focus are connected in sequence to obtain an abnormal target polyline segment;

[0037] Obtain the opening direction of each abnormal target polyline segment and mark it as the abnormal target opening direction;

[0038] The actual power change curve is divided into a number of abnormal power curve segments, and the endpoints and midpoints of the two ends of the abnormal target power curve segment are obtained, and are marked as the abnormal power starting point, the abnormal power end point and the abnormal power midpoint respectively;

[0039] The abnormal power starting point, the abnormal power focus point and the abnormal power midpoint are sequentially connected to obtain an abnormal power broken line segment;

[0040] The opening direction of each abnormal power polyline segment is obtained and marked as the abnormal power opening direction. During the monitoring period, the abnormal target opening direction in each same monitoring time period is compared with the abnormal power opening direction. The comparison process is as follows:

[0041] If the abnormal target opening direction is consistent with the abnormal power opening direction in each same monitoring time period, a signal with the same abnormal opening direction is generated, and other abnormal device groups corresponding to the signal with the same abnormal opening direction are marked as abnormal similar device groups.

[0042] As a further solution of the present invention: the abnormal synchronization value is obtained in the following manner:

[0043] Obtain the actual deviation degree coefficient corresponding to the abnormally similar device group, and mark it as the abnormally similar deviation value;

[0044] Obtain the actual deviation degree coefficient corresponding to the abnormal target device group and mark it as the abnormal target deviation value;

[0045] Calculate the ratio of the abnormal similarity deviation value corresponding to each abnormal similar device group to the abnormal target deviation value corresponding to the abnormal target device group to obtain an abnormal similarity value;

[0046] All abnormal similarity values ​​are added together to obtain the abnormal synchronization value.

[0047] As a further solution of the present invention: the adjustment process of the state of the thermal power plant unit is as follows:

[0048] Substitute the unit status value into the formula: ZT t =ZT+ZT×K, calculate the adjusted thermal power plant state value ZT t , where ZT represents the current state value of the thermal power plant unit, and K represents the adjustment coefficient;

[0049] The adjustment coefficient is obtained as follows:

[0050] formula: The adjustment coefficient K is calculated, where PC m It is represented as the abnormal target deviation value of the abnormal target device group, G y Expressed as standard power.

[0051] A thermal power plant unit status assessment system, the system comprising:

[0052] Equipment data acquisition module: divide the thermal power plant units into multiple equipment groups, obtain the operating data of each equipment group, where the operating data includes the actual power value, and process the actual power value of each equipment group to obtain the abnormal power time period;

[0053] Unit status assessment module: Based on the abnormal power time period, the abnormal duration and abnormal deviation value are obtained, and the abnormal duration ratio and abnormal degree coefficient are obtained respectively. The abnormal duration ratio and abnormal degree coefficient are processed to obtain the unit status value, and compared with the threshold value. If the unit status value is greater than the unit status threshold, a unit status instability signal is generated;

[0054] Equipment data analysis module: Based on the unstable unit status signal, the actual power changes of multiple abnormal equipment groups are obtained, the actual power changes of multiple abnormal equipment groups are analyzed to obtain the abnormal target equipment group, and the actual power changes of the abnormal target equipment group are compared with the actual power changes of other abnormal equipment groups to obtain the abnormal synchronization value, and compared with the threshold. If the abnormal synchronization value is greater than or equal to the abnormal synchronization threshold, an abnormal synchronization signal is generated;

[0055] Unit status adjustment module: Based on the abnormal synchronization signal, the adjustment coefficient is obtained to adjust the status of the thermal power plant units.

[0056] The beneficial effects of the present invention are as follows:

[0057] (1) The present invention divides the units of a thermal power plant into multiple equipment groups, obtains the operating data of each equipment group, wherein the operating data includes an actual power value, processes the actual power value of each equipment group, obtains an abnormal power time period, obtains an abnormal duration and an abnormal deviation value based on the abnormal power time period, obtains an abnormal duration ratio and an abnormal degree coefficient respectively, processes the abnormal duration ratio and the abnormal degree coefficient, obtains a unit state value, and compares it with a threshold value. If the unit state value is greater than the unit state threshold value, a unit state instability signal is generated, thereby comprehensively evaluating the operating state of the thermal power plant unit by analyzing the abnormal time and abnormal degree of each equipment group in the thermal power plant unit;

[0058] (2) The present invention obtains actual power changes of multiple abnormal equipment groups based on the unstable unit state signal, analyzes the actual power changes of multiple abnormal equipment groups, obtains an abnormal target equipment group, and compares the actual power changes of the abnormal target equipment group with the actual power changes of other abnormal equipment groups to obtain an abnormal synchronization value, and compares it with a threshold value. If the abnormal synchronization value is greater than or equal to the abnormal synchronization threshold value, an abnormal synchronization signal is generated, thereby analyzing and comparing the actual power changes of multiple abnormal equipment groups, selecting an abnormal target equipment group, and analyzing the degree of synchronization between the abnormal target equipment group and the other abnormal equipment groups to determine an abnormally similar equipment group, and then analyzing and evaluating the degree of power change between the abnormal target equipment group and the abnormally similar equipment group, and determining that the unstable operation of the thermal power plant unit is due to the actual power change of the abnormal target equipment group causing abnormal actual power of other equipment groups in the entire thermal power plant unit;

[0059] (3) When the present invention generates an abnormal synchronization signal, it obtains the abnormal target deviation value of the abnormal target device group, substitutes the abnormal target deviation value of the abnormal target device group into the formula to obtain the adjustment coefficient, and substitutes the unit state value and the adjustment coefficient into the formula to obtain the adjusted thermal power plant state value, thereby completing the adjustment of the thermal power plant unit state, thereby solving the problem of abnormal actual power of other device groups in the entire thermal power plant unit caused by the actual power change of the abnormal target device group by adjusting the actual power change of the abnormal target device group. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] The present invention will be further described below in conjunction with the accompanying drawings.

[0061] Figure 1 is a flowchart of the steps of Embodiment 1 of the present invention;

[0062] Figure 2 is a flowchart of the steps of Embodiment 2 of the present invention;

[0063] Figure 3 is a flowchart of the steps of Embodiment 3 of the present invention;

[0064] Figure 4 It is a system flow chart of embodiment 4 of the present invention. DETAILED DESCRIPTION

[0065] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0066] Example 1

[0067] like Figure 1 As shown, a method for evaluating the status of a thermal power plant unit according to an embodiment of the present invention includes:

[0068] Step 1: Divide the units of the thermal power plant into multiple equipment groups, monitor the actual power of each equipment group, divide the monitoring period into several monitoring time periods within the monitoring period, obtain the operation data of each equipment group, wherein the operation data includes the actual power value, process the actual power value of each equipment group, and obtain the abnormal power time period;

[0069] It should be noted that: the monitoring period is divided in the following manner: the monitoring period is divided into equal time intervals to obtain monitoring time periods;

[0070] It should be noted that the abnormal power time period means that during the monitoring time period, the actual power of each equipment group in the thermal power plant unit is significantly different from the standard power, and the monitoring time period is marked as the abnormal power time period;

[0071] In some embodiments, the thermal power plant units are divided into multiple groups of equipment groups according to the functional type corresponding to each equipment group, to obtain multiple groups of equipment groups, and the actual power value in each monitoring time period is obtained;

[0072] The actual power in each monitoring period is compared with the standard power. The comparison process is as follows:

[0073] If the actual power in each monitoring time period is greater than or equal to the standard power, the monitoring time period is marked as a normal power time period;

[0074] If the actual power in each monitoring time period is less than the standard power, the monitoring time period is marked as an abnormal power time period;

[0075] Step 2: Based on the abnormal power time period, the abnormal duration and the abnormal deviation value are obtained, and the abnormal duration ratio and the abnormal degree coefficient are obtained respectively. The abnormal duration ratio and the abnormal degree coefficient are processed to obtain the unit state value, and compared with the threshold value to generate a signal of whether the unit state is stable;

[0076] The signal of whether the unit state is stable includes a signal of a stable unit state or a signal of an unstable unit state;

[0077] In some embodiments, during the monitoring period, the interval time periods between all abnormal power time periods are obtained and marked as abnormal interval time periods;

[0078] The time length values ​​corresponding to all abnormal interval time periods are added together to obtain the abnormal interval time, and the ratio of the abnormal interval time to the monitoring cycle time is calculated to obtain the abnormal duration ratio;

[0079] The abnormal duration ratios of all equipment groups in the thermal power plant are added and averaged to obtain the abnormal duration ratio;

[0080] Obtain the actual power corresponding to the abnormal time period, subtract the actual power corresponding to the abnormal time period from the standard power, and take the absolute value to obtain the actual deviation value;

[0081] The actual deviation values ​​corresponding to all abnormal time periods are added together and averaged to obtain the total actual deviation value;

[0082] The actual deviation degree coefficient is obtained by calculating the ratio of the actual deviation total value to the standard power;

[0083] The actual deviation degree values ​​of all equipment groups in the thermal power plant unit are summed and averaged to obtain the abnormal degree coefficient;

[0084] Substitute the abnormal persistence ratio and the abnormal degree coefficient into the formula: The unit status value ZT is calculated, where T y Expressed as abnormal persistence ratio, PC y It is expressed as the abnormality degree coefficient, and α and β are the preset weight coefficients;

[0085] It can be understood that: the meaning of the unit status value is: within the monitoring period, the operation status of the entire thermal power plant unit is reflected by the duration of the abnormal operation time of the equipment group in the thermal power plant unit and the degree of deviation during the abnormal operation time. Specifically, the larger this value is, the longer the abnormal operation time of the equipment group in the thermal power plant unit is, the greater the degree of deviation during the abnormal operation time is, and the stability of the thermal power plant unit operation is low. The smaller this value is, the shorter the abnormal operation time of the equipment group in the thermal power plant unit is, the smaller the degree of deviation during the abnormal operation time is, and the stability of the thermal power plant unit operation is high.

[0086] The unit status value is compared with the unit status threshold. The comparison process is as follows:

[0087] If the unit status value is greater than the unit status threshold, it means that the abnormal operation time of the equipment group in the thermal power plant unit continues for a long time, and the deviation degree during the abnormal operation time is large, the stability of the thermal power plant unit operation state is low, and the unit state instability signal is generated;

[0088] If the unit status value is less than or equal to the unit status threshold, it means that the abnormal operation time of the equipment group in the thermal power plant unit is short and the deviation degree within the abnormal operation time is small, the operation status of the thermal power plant unit is stable, and the unit status stability signal is generated;

[0089] The specific implementation plan of the embodiment of the present invention is: divide the units of the thermal power plant to obtain multiple groups of equipment groups, obtain the operating data of each equipment group, wherein the operating data includes the actual power value, process the actual power value of each equipment group to obtain the abnormal power time period, based on the abnormal power time period, obtain the abnormal duration and the abnormal deviation value, respectively obtain the abnormal duration ratio and the abnormal degree coefficient, process the abnormal duration ratio and the abnormal degree coefficient to obtain the unit state value, and compare it with the threshold value, if the unit state value is greater than the unit state threshold, then generate a unit state instability signal, thereby comprehensively evaluating the operating state of the thermal power plant unit by analyzing the abnormal time and abnormal degree of each equipment group in the thermal power plant unit.

[0090] Example 2

[0091] like Figure 2 As shown, a method for evaluating the status of a thermal power plant unit according to an embodiment of the present invention includes:

[0092] Step 3: Based on the unstable unit status signal, the actual power changes of multiple abnormal device groups are obtained, and the actual power changes of the multiple abnormal device groups are analyzed to obtain the abnormal target device group, and the actual power changes of the abnormal target device group are compared with the actual power changes of other abnormal device groups to obtain the abnormal synchronization value, and compared with the threshold value to generate an abnormal synchronization signal;

[0093] The abnormal synchronization signal includes: abnormal synchronization signal and abnormal non-synchronization signal;

[0094] In some embodiments, based on the unstable unit status signal, the actual power change of each abnormal device group is obtained in the following manner:

[0095] During the monitoring period, an XY axis coordinate system is established, where the X axis represents time and the Y axis represents power. The actual power in each monitoring period is substituted into the XY axis coordinate system to draw an actual power change curve.

[0096] Based on the actual power change curve, substitute the standard power into the actual power change curve, mark the Y axis, and make a standard power line parallel to the X axis, marked as the standard power line;

[0097] Select the actual power change curve segment that is lower than the standard power line and mark it as an abnormal power curve segment;

[0098] The lengths of all abnormal power curve segments are added together and the ratio is calculated with the standard power line to obtain the abnormal power curve length ratio;

[0099] Compare the length ratios of the abnormal power curves corresponding to each abnormal device group, select the abnormal device group corresponding to the maximum abnormal power curve length ratio, mark it as the abnormal target device group, and mark the actual power change curve corresponding to the abnormal target device group as the abnormal target power curve;

[0100] The abnormal target power curve is divided into a plurality of abnormal target power curve segments, and the endpoints and midpoints of both ends of the abnormal target power curve segments are obtained, and are marked as the abnormal target starting point, the abnormal target focus, and the abnormal target midpoint, respectively;

[0101] It should be noted that: the abnormal target power curve is divided in the following way: the monitoring time period on the X-axis of the actual power change curve is divided into abnormal target power curve segments;

[0102] The abnormal target starting point, the abnormal target midpoint and the abnormal target focus are connected in sequence to obtain an abnormal target polyline segment;

[0103] Obtain the opening direction of each abnormal target polyline segment and mark it as the abnormal target opening direction;

[0104] The actual power change curve is divided into a number of abnormal power curve segments, and the endpoints and midpoints of the two ends of the abnormal target power curve segment are obtained, and are marked as the abnormal power starting point, the abnormal power end point and the abnormal power midpoint respectively;

[0105] It should be noted that the actual power change curve is divided in the same way as the abnormal target power curve;

[0106] The abnormal power starting point, the abnormal power focus point and the abnormal power midpoint are sequentially connected to obtain an abnormal power broken line segment;

[0107] Obtain the opening direction of each abnormal power polyline segment and mark it as the abnormal power opening direction;

[0108] During the monitoring cycle, the abnormal target opening direction and the abnormal power opening direction in each same monitoring time period are compared. The comparison process is as follows:

[0109] If the abnormal target opening direction is consistent with the abnormal power opening direction in each same monitoring time period, it means that the actual power changes of the abnormal target device group and other abnormal device groups are synchronized, and the same abnormal opening direction signal is generated, and other abnormal device groups corresponding to the same abnormal opening direction signal are marked as abnormal similar device groups;

[0110] If the abnormal target opening direction is inconsistent with the abnormal power opening direction in each same monitoring time period, it means that the actual power changes of the abnormal target device group and other abnormal device groups are not synchronized, and abnormal change different signals are generated, and other abnormal device groups corresponding to the abnormal opening direction different signals are marked as abnormal non-similar device groups;

[0111] Obtain the actual deviation degree coefficient corresponding to the abnormally similar device group, and mark it as the abnormally similar deviation value;

[0112] Obtain the actual deviation degree coefficient corresponding to the abnormal target device group and mark it as the abnormal target deviation value;

[0113] Calculate the ratio of the abnormal similarity deviation value corresponding to each abnormal similar device group to the abnormal target deviation value corresponding to the abnormal target device group to obtain an abnormal similarity value;

[0114] All abnormal similarity values ​​are added together to obtain the abnormal synchronization value;

[0115] It should be noted that the abnormal synchronization value is obtained in the following way: within the monitoring period, the degree of synchronization between the abnormal target device group (i.e., the device group identified as having the largest abnormal power curve length ratio) and other abnormal device groups in actual power changes is determined by comparing the opening direction of the abnormal target power change broken line segment with the opening direction of other abnormal power change broken line segments in each same monitoring time period. Specifically, if the opening direction of the power change broken line segment of the abnormal target device group and other abnormal device groups in each same monitoring time period is consistent, then the other abnormal device groups are marked as abnormally similar device groups, and the abnormally similar device groups and the abnormal target device groups are calculated. The ratio of the actual deviation degree coefficients (i.e., the abnormal similarity value) is calculated, and all abnormal similarity values ​​are added together to obtain the abnormal synchronization value, which reflects the overall synchronization degree of the power changes of the abnormal target device group and other abnormal device groups. Specifically, if the abnormal synchronization value is large, it means that the power changes of the abnormal target device group and other abnormal device groups are relatively consistent, and the actual power changes of the abnormal target device group have a greater impact on the power changes of other abnormal device groups. If the abnormal synchronization value is small, it means that there is a large difference in the power changes of the abnormal target device group and other abnormal device groups, and the actual power changes of the abnormal target device group have a smaller impact on the power changes of other abnormal device groups.

[0116] The abnormal synchronization value is compared with the abnormal synchronization threshold. The comparison process is as follows:

[0117] If the abnormal synchronization value is greater than or equal to the abnormal synchronization threshold, it means that the power changes of the abnormal target device group and other abnormal device groups are relatively consistent, and the actual power change of the abnormal target device group has a greater impact on the power changes of other abnormal device groups, and an abnormal synchronization signal is generated;

[0118] If the abnormal synchronization value is less than the abnormal synchronization threshold, it means that there is a large difference in power changes between the abnormal target device group and other abnormal device groups, and the actual power change of the abnormal target device group has a small impact on the power changes of other abnormal device groups, generating an abnormal asynchronous signal;

[0119] The specific implementation plan of the embodiment of the present invention is: based on the unstable unit status signal, the actual power changes of multiple abnormal equipment groups are obtained, the actual power changes of the multiple abnormal equipment groups are analyzed to obtain the abnormal target equipment group, and the actual power changes of the abnormal target equipment group are compared with the actual power changes of other abnormal equipment groups to obtain an abnormal synchronization value, and compared with the threshold value. If the abnormal synchronization value is greater than or equal to the abnormal synchronization threshold, an abnormal synchronization signal is generated, so as to select the abnormal target equipment group by analyzing and comparing the actual power changes of multiple abnormal equipment groups, and analyze the degree of synchronization between the abnormal target equipment group and the other abnormal equipment groups to determine the abnormal similar equipment group, and then analyze and evaluate the degree of power change between the abnormal target equipment group and the abnormal similar equipment group, and determine that the unstable operation of the thermal power plant unit is due to the actual power change of the abnormal target equipment group causing the actual power abnormality of other equipment groups in the entire thermal power plant unit.

[0120] Example 3

[0121] like Figure 3 As shown, based on Example 1 and Example 2, a method for evaluating the state of a thermal power plant unit according to an embodiment of the present invention includes:

[0122] Step 4: Based on the abnormal synchronization signal, the adjustment coefficient is obtained to adjust the status of the thermal power plant unit;

[0123] In some embodiments, when an abnormal synchronization signal is generated, an abnormal target deviation value of an abnormal target device group is obtained, and the abnormal target deviation value of the abnormal target device group is substituted into a formula to obtain an adjustment coefficient. The specific process is as follows:

[0124] formula: The adjustment coefficient K is calculated, where PC m It is represented as the abnormal target deviation value of the abnormal target device group, G y Expressed as standard power;

[0125] The adjustment process of the unit status of a thermal power plant is as follows:

[0126] Substitute the unit status value into the formula: ZT t =ZT+ZT×K, calculate the adjusted thermal power plant state value ZT t , where ZT represents the current state value of the thermal power plant unit, and K represents the adjustment coefficient;

[0127] The specific implementation plan of the embodiment of the present invention is: when an abnormal synchronization signal is generated, the abnormal target deviation value of the abnormal target equipment group is obtained, the abnormal target deviation value of the abnormal target equipment group is substituted into the formula to obtain the adjustment coefficient, and the unit state value and the adjustment coefficient are substituted into the formula to obtain the adjusted thermal power plant state value, and the adjustment of the thermal power plant unit state is completed, thereby solving the problem of abnormal actual power of other equipment groups in the entire thermal power plant unit caused by the actual power change of the abnormal target equipment group by adjusting the actual power change of the abnormal target equipment group.

[0128] Example 4

[0129] like Figure 4 Based on Example 1, Example 2 and Example 3, a thermal power plant unit status assessment system includes:

[0130] Equipment data acquisition module: divide the thermal power plant units into multiple equipment groups, obtain the operating data of each equipment group, where the operating data includes the actual power value, and process the actual power value of each equipment group to obtain the abnormal power time period;

[0131] Unit status assessment module: Based on the abnormal power time period, the abnormal duration and abnormal deviation value are obtained, and the abnormal duration ratio and abnormal degree coefficient are obtained respectively. The abnormal duration ratio and abnormal degree coefficient are processed to obtain the unit status value, and compared with the threshold value. If the unit status value is greater than the unit status threshold, a unit status instability signal is generated;

[0132] Equipment data analysis module: Based on the unstable unit status signal, the actual power changes of multiple abnormal equipment groups are obtained, the actual power changes of multiple abnormal equipment groups are analyzed to obtain the abnormal target equipment group, and the actual power changes of the abnormal target equipment group are compared with the actual power changes of other abnormal equipment groups to obtain the abnormal synchronization value, and compared with the threshold. If the abnormal synchronization value is greater than or equal to the abnormal synchronization threshold, an abnormal synchronization signal is generated;

[0133] Unit status adjustment module: Based on the abnormal synchronization signal, the adjustment coefficient is obtained to adjust the status of the thermal power plant units.

[0134] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for evaluating the status of a thermal power plant unit, characterized in that: include: Step 1: Divide the thermal power plant units into multiple equipment groups, obtain the operation data of each equipment group, wherein the operation data includes the actual power value, and process the actual power value of each equipment group to obtain the abnormal power time period; Step 2: Based on the abnormal power time period, the abnormal duration and the abnormal deviation value are obtained, and the abnormal duration ratio and the abnormal degree coefficient are obtained respectively. The abnormal duration ratio and the abnormal degree coefficient are processed to obtain the unit state value, and compared with the threshold value. If the unit state value is greater than the unit state threshold value, a unit state instability signal is generated; Step 3: Based on the unstable unit status signal, the actual power changes of multiple abnormal device groups are obtained, the actual power changes of the multiple abnormal device groups are analyzed to obtain the abnormal target device group, and the actual power changes of the abnormal target device group are compared with the actual power changes of other abnormal device groups to obtain an abnormal synchronization value, and compared with the threshold value. If the abnormal synchronization value is greater than or equal to the abnormal synchronization threshold, an abnormal synchronization signal is generated; Step 4: Based on the abnormal synchronization signal, obtain the adjustment coefficient and adjust the status of the thermal power plant units.

2. A method for evaluating the status of a thermal power plant unit according to claim 1, characterized in that: The method for obtaining the abnormal power time period is as follows: The thermal power plant units are divided into multiple equipment groups according to the functional type to obtain multiple equipment groups, and the actual power of each equipment group is monitored. Within the monitoring period, the monitoring period is divided into several monitoring time periods to obtain the actual power value within each monitoring time period; The actual power in each monitoring period is compared with the standard power. The comparison process is as follows: If the actual power in each monitoring time period is greater than or equal to the standard power, the monitoring time period is marked as a normal power time period; If the actual power in each monitoring time period is less than the standard power, the monitoring time period is marked as an abnormal power time period.

3. A method for evaluating the status of a thermal power plant unit according to claim 1, characterized in that: The method for obtaining the abnormal continuous ratio is as follows: In the monitoring period, the interval time periods between all abnormal power time periods are obtained and marked as abnormal interval time periods; The time length values ​​corresponding to all abnormal interval time periods are added together to obtain the abnormal interval time, and the ratio of the abnormal interval time to the monitoring cycle time is calculated to obtain the abnormal duration ratio; The abnormal duration ratios of all equipment groups in the thermal power plant units are added together and averaged to obtain the abnormal duration ratio.

4. A method for evaluating the status of a thermal power plant unit according to claim 1, characterized in that: The abnormality coefficient is obtained as follows: Obtain the actual power corresponding to the abnormal time period, subtract the actual power corresponding to the abnormal time period from the standard power, and take the absolute value to obtain the actual deviation value; The actual deviation values ​​corresponding to all abnormal time periods are added together and averaged to obtain the total actual deviation value; The actual deviation degree coefficient is obtained by calculating the ratio of the actual deviation total value to the standard power; The actual deviation degree values ​​of all equipment groups in the thermal power plant units are summed and averaged to obtain the abnormal degree coefficient.

5. A method for evaluating the status of a thermal power plant unit according to claim 1, characterized in that: The unit status value is obtained as follows: Substitute the abnormal persistence ratio and the abnormal degree coefficient into the formula: The unit status value ZT is calculated, where T y Expressed as abnormal persistence ratio, PC y It is expressed as the abnormality degree coefficient, and α and β are preset weight coefficients.

6. A method for evaluating the status of a thermal power plant unit according to claim 5, characterized in that: The process of obtaining the abnormal target device group is as follows: During the monitoring period, an XY axis coordinate system is established, where the X axis represents time and the Y axis represents power. The actual power in each monitoring period is substituted into the XY axis coordinate system to draw an actual power change curve. Based on the actual power change curve, substitute the standard power into the actual power change curve, mark the Y axis, and make a standard power line parallel to the X axis, marked as the standard power line; Select the actual power change curve segment that is lower than the standard power line and mark it as an abnormal power curve segment; The lengths of all abnormal power curve segments are added together and the ratio is calculated with the standard power line to obtain the abnormal power curve length ratio; The abnormal power curve length ratios corresponding to each abnormal device group are compared, and the abnormal device group corresponding to the maximum abnormal power curve length ratio is selected and marked as the abnormal target device group.

7. A method for evaluating the status of a thermal power plant unit according to claim 5, characterized in that: The method of obtaining abnormally similar device groups is as follows: Marking the actual power change curve corresponding to the abnormal target device group as the abnormal target power curve; The abnormal target power curve is divided into a plurality of abnormal target power curve segments, and the endpoints and midpoints of both ends of the abnormal target power curve segments are obtained, and are marked as the abnormal target starting point, the abnormal target focus, and the abnormal target midpoint, respectively; The abnormal target starting point, the abnormal target midpoint and the abnormal target focus are connected in sequence to obtain an abnormal target polyline segment; Obtain the opening direction of each abnormal target polyline segment and mark it as the abnormal target opening direction; The actual power change curve is divided into a number of abnormal power curve segments, and the endpoints and midpoints of the two ends of the abnormal target power curve segment are obtained, and are marked as the abnormal power starting point, the abnormal power end point and the abnormal power midpoint respectively; The abnormal power starting point, the abnormal power focus point and the abnormal power midpoint are sequentially connected to obtain an abnormal power broken line segment; The opening direction of each abnormal power polyline segment is obtained and marked as the abnormal power opening direction. During the monitoring period, the abnormal target opening direction in each same monitoring time period is compared with the abnormal power opening direction. The comparison process is as follows: If the abnormal target opening direction is consistent with the abnormal power opening direction in each same monitoring time period, a signal with the same abnormal opening direction is generated, and other abnormal device groups corresponding to the signal with the same abnormal opening direction are marked as abnormal similar device groups.

8. A method for evaluating the status of a thermal power plant unit according to claim 5, characterized in that: The method for obtaining the abnormal synchronization value is: Obtain the actual deviation degree coefficient corresponding to the abnormally similar device group, and mark it as the abnormally similar deviation value; Obtain the actual deviation degree coefficient corresponding to the abnormal target device group and mark it as the abnormal target deviation value; Calculate the ratio of the abnormal similarity deviation value corresponding to each abnormal similar device group to the abnormal target deviation value corresponding to the abnormal target device group to obtain an abnormal similarity value; All abnormal similarity values ​​are added together to obtain the abnormal synchronization value.

9. A method for evaluating the status of a thermal power plant unit according to claim 5, characterized in that: The adjustment process of the unit status of a thermal power plant is as follows: Substitute the unit status value into the formula: ZT t =ZT+ZT×K, calculate the adjusted thermal power plant state value ZT t , where ZT represents the current state value of the thermal power plant unit, and K represents the adjustment coefficient; The adjustment coefficient is obtained as follows: formula: The adjustment coefficient K is calculated, where PC m It is represented as the abnormal target deviation value of the abnormal target device group, G y Expressed as standard power.

10. A thermal power plant unit status assessment system, characterized in that: The system includes: Equipment data acquisition module: divide the thermal power plant units into multiple equipment groups, obtain the operating data of each equipment group, where the operating data includes the actual power value, and process the actual power value of each equipment group to obtain the abnormal power time period; Unit status assessment module: Based on the abnormal power time period, the abnormal duration and abnormal deviation value are obtained, and the abnormal duration ratio and abnormal degree coefficient are obtained respectively. The abnormal duration ratio and abnormal degree coefficient are processed to obtain the unit status value, and compared with the threshold value. If the unit status value is greater than the unit status threshold, a unit status instability signal is generated; Equipment data analysis module: Based on the unstable unit status signal, the actual power changes of multiple abnormal equipment groups are obtained, the actual power changes of multiple abnormal equipment groups are analyzed to obtain the abnormal target equipment group, and the actual power changes of the abnormal target equipment group are compared with the actual power changes of other abnormal equipment groups to obtain the abnormal synchronization value, and compared with the threshold. If the abnormal synchronization value is greater than or equal to the abnormal synchronization threshold, an abnormal synchronization signal is generated; Unit status adjustment module: Based on the abnormal synchronization signal, the adjustment coefficient is obtained to adjust the status of the thermal power plant units.

Images