An electric valve station abnormal working condition identification and control method and system thereof

Abstract

The application discloses an abnormal working condition identification and control method and system of an electric valve station, and the method comprises the following steps: collecting a working condition signal set of a low-voltage switch cabinet of the electric valve station and / or an auxiliary signal set of a control cabinet of the electric valve station; identifying the working condition of the electric valve station based on the working condition signal set and / or the auxiliary signal set, and triggering an abnormal working condition alarm signal and a passivation control signal if the working condition is identified as abnormal. The application realizes identification, early warning and passivation control of various electric valve failure modes based on the working condition signal set of the low-voltage switch cabinet of the electric valve station and the auxiliary signal set of the control cabinet of the electric valve station, provides an effective supplement for the failure diagnosis function of the electric valve, and can improve the reliability of the process system of an enterprise and reduce industrial accident losses based on the flexible combination of various electric valve failure divisions.

Description

A method and system for identifying and controlling abnormal operating conditions of an electric valve station. Technical Field

[0001] This invention belongs to the field of industrial control fault mode recognition technology, and in particular to a method and system for identifying and controlling abnormal operating conditions of electric valve stations. Background Technology

[0002] Electric valves are widely used in current industrial production as the execution terminals for process system control. With the continuous improvement of production processes and operational requirements, and the widespread adoption of industrial control systems (DCS, PLC, etc.) in manufacturing enterprises, the original crude electric valves can no longer meet the demands. From the perspective of optimization and precision control, more process parameters need to be collected. To meet this demand, the electric actuator units of electric valves are beginning to develop towards intelligence and integration. Low-voltage switchgear, as the control and protection mechanism for electric valves, is also constantly upgrading with the progress of industrial automation. Early switchgear generally combined common electrical components such as circuit breakers, contactors, and conventional relays using hard-wired circuits to achieve control and protection of electric valves. However, with the increasing intelligence and integration of electric actuator units in electric valves, low-voltage switchgear has gradually degenerated into simple electrical circuit breaker cabinets in actual industrial applications. At the same time, the fault diagnosis function of the electric actuator unit itself is still under development and cannot fully monitor all fault conditions in the use of electric valves. Moreover, its own fault diagnosis information is limited by communication protocol restrictions or insufficient signal cable laying, and most of it has not been able to enter the industrial control system (such as DCS, PLC, etc.). As a result, electric valves have long suffered from problems such as difficulty in identifying faults, lack of early warning of important faults, and high manpower and material resources consumed in the handling process. The continued use of electric valves that are operating with faults often causes great accident losses to industrial enterprises. Summary of the Invention

[0003] The main objective of this invention is to propose a method and system for identifying and controlling abnormal operating conditions of electric valve stations. Unlike the self-diagnostic technology of electric actuator units in electric valves, this method, based on the operating condition signal set of the low-voltage switchgear and the auxiliary signal set of the control cabinet of the electric valve station, achieves the identification, early warning, and passivation control of various electric valve fault modes. It effectively supplements the fault diagnosis function of electric valves. Furthermore, based on the segmentation of various electric valve faults, this invention can be flexibly combined and configured as needed, thereby improving the reliability of enterprise process systems and reducing industrial accident losses.

[0004] The present invention adopts the following technical solution:

[0005] On the one hand, a method for identifying and controlling abnormal operating conditions of an electric valve station includes:

[0006] The system collects the operating condition signal set of the low-voltage switchgear of the electric valve station and / or the auxiliary signal set of the electric valve station control cabinet; the operating condition signal set includes one or more of the following: main cabinet working circuit input voltage, main cabinet standby circuit input voltage, main cabinet working circuit input current, main cabinet standby circuit input current, main cabinet switching output voltage, main cabinet switching output current, main cabinet switching switch auxiliary contact, expansion cabinet branch output voltage, expansion cabinet branch output current, low-voltage switchgear internal temperature, low-voltage switchgear internal humidity, mixed control cabinet terminal interference voltage, low-voltage switchgear internal loudness, low-voltage switchgear internal closing handle displacement, and low-voltage switchgear internal circuit breaker auxiliary contact; the auxiliary signal set includes one or more of the following: electric valve front and rear medium parameters and electric valve control commands.

[0007] Based on the aforementioned operating condition signal set and / or auxiliary signal set, the operating condition of the electric valve station is identified. If an abnormal operating condition is identified, an abnormal operating condition alarm signal and a passivation control signal of the electric valve station are triggered.

[0008] Based on the passivation control signal, the corresponding passivation control is executed.

[0009] Preferably, the operating condition of the electric valve station is identified based on the operating condition signal set and / or auxiliary signal set. If an abnormal operating condition is identified, an abnormal operating condition alarm signal and a passivation control signal of the electric valve station are triggered, specifically including:

[0010] When any preset electric valve is detected to have an output control command, and the specified current does not reach the lower limit of the normal current of the corresponding electric valve within the first fixed time after the control command is triggered, or the pressure, temperature and flow of the medium before and after the electric valve do not exceed the corresponding threshold change, it is identified as the electric valve refusing to operate, and the electric valve refusing to operate alarm signal and the corresponding passivation control signal are triggered.

[0011] The identification equation is as follows:

[0012]

[0013] Where j represents the preset electric valve number; n represents the preset number of electric valves; Δt1 represents the first fixed time after the control command is triggered; F j This indicates that the electric valve outputs control commands; This indicates that the specified current has not reached the lower limit of the normal operating current of the electric valve; This indicates that the pressure change of the medium before and after the electric valve did not exceed the pressure threshold. This indicates that the temperature change of the medium before and after the electric valve did not exceed the temperature threshold. This indicates that the change in medium flow before and after the electric valve does not exceed the flow threshold; the specified current includes the input current of the main cabinet working circuit, the output current of the main cabinet switching circuit, or the output current of the branch circuit of the expansion cabinet.

[0014] Preferably, the operating condition of the electric valve station is identified based on the operating condition signal set and / or auxiliary signal set. If an abnormal operating condition is identified, an abnormal operating condition alarm signal and a passivation control signal of the electric valve station are triggered, specifically including:

[0015] When it is detected that all preset electric valves have not output control commands within the second forward time period, but the specified current reaches the minimum value of the lower limit of the normal operating current of the electric valve, or when it is detected that any preset electric valve has not output control commands within the second forward time period, but two of the media parameters before and after the corresponding electric valve exceed the corresponding threshold change, it is identified as a malfunction of the electric valve, triggering the electric valve malfunction alarm signal and the corresponding passivation control signal.

[0016] The identification equation is as follows:

[0017]

[0018] Where j represents the preset electric valve number; n represents the preset number of electric valves; min(I jL ) indicates the minimum value at which the specified current reaches the lower limit of the normal operating current of the electric valve; Δt2 indicates the second forward fixed time period; This indicates that the preset electric valve is not outputting control commands; This indicates that all preset electric valve control commands have not been triggered; ΔP j ΔT represents the change in medium pressure before and after the electric valve exceeding the pressure threshold; j ΔQ represents the change in medium temperature before and after the electric valve exceeding the temperature threshold; j This indicates the amount by which the flow rate of the medium before and after the electric valve exceeds the flow threshold; the specified current includes the input current of the main cabinet working circuit, the output current of the main cabinet switching circuit, or the output current of the branch circuit of the expansion cabinet.

[0019] Preferably, the operating condition of the electric valve station is identified based on the operating condition signal set and / or auxiliary signal set. If an abnormal operating condition is identified, an abnormal operating condition alarm signal and a passivation control signal of the electric valve station are triggered, specifically including:

[0020] When the specified current is detected to reach the second threshold of high load current of the low-voltage switchgear of the electric valve station, or when the specified current is detected to reach the first threshold of high load current of the low-voltage switchgear of the electric valve station and the electric valve has not been triggered due to malfunction within a third forward time period, the number of simultaneous trigger commands of all preset electric valves is not less than the number of media changes before and after the preset electric valve, it is identified as the electric valve is over-torque, and the electric valve over-torque alarm signal and the corresponding passivation control signal are triggered.

[0021] The identification equation is as follows:

[0022]

[0023]

[0024] Among them, I H2 This indicates the second threshold value for high-load current in the low-voltage switchgear of the electric valve station; I H1 Δt3 represents the first threshold value for high load current in the low-voltage switchgear of the electric valve station; Δt3 represents the third forward fixed time period. This indicates that the electric valve malfunctioned and was not triggered; CNT(F) j CNT(ΔP) represents the number of commands that can be triggered simultaneously by all preset electric valves; j ·ΔT j +ΔT j ·ΔQ j +ΔP j ·ΔQ j ) represents the number of media changes before and after all preset electric valves; j represents the preset electric valve number; n represents the number of preset electric valves; F j This indicates the control command for the electric valve; ΔP j ΔT represents the change in medium pressure before and after the electric valve exceeding the pressure threshold; j ΔQ represents the change in medium temperature before and after the electric valve exceeding the temperature threshold; j This indicates the amount by which the flow rate of the medium before and after the electric valve exceeds the flow threshold; the specified current includes the input current of the main cabinet working circuit, the output current of the main cabinet switching circuit, or the output current of the branch circuit of the expansion cabinet.

[0025] Preferably, the operating condition of the electric valve station is identified based on the operating condition signal set and / or auxiliary signal set. If an abnormal operating condition is identified, an abnormal operating condition alarm signal and a passivation control signal of the electric valve station are triggered, specifically including:

[0026] When any preset electric valve is detected to have an output control command, and the pressure, temperature and flow rate of the medium before and after the electric valve do not exceed the corresponding threshold changes within the first fixed time period after the control command is triggered, and the specified current reaches the maximum no-load current, it is identified as no-load stall of the electric valve, triggering the no-load stall alarm signal and the corresponding passivation control signal of the electric valve.

[0027] The identification equation is as follows:

[0028]

[0029] Where max(I) oH) indicates that the specified current has reached the maximum no-load current; j indicates the preset electric valve number; n indicates the preset number of electric valves; Δt1 indicates the first fixed time after the control command is triggered; F j This indicates that the electric valve outputs control commands; This indicates that the pressure change of the medium before and after the electric valve did not exceed the pressure threshold. This indicates that the temperature change of the medium before and after the electric valve did not exceed the temperature threshold. This indicates that the change in medium flow before and after the electric valve does not exceed the flow threshold; the specified current includes the input current of the main cabinet working circuit, the output current of the main cabinet switching circuit, or the output current of the branch circuit of the expansion cabinet.

[0030] Preferably, the operating condition of the electric valve station is identified based on the operating condition signal set and / or auxiliary signal set. If an abnormal operating condition is identified, an abnormal operating condition alarm signal and a passivation control signal of the electric valve station are triggered, specifically including:

[0031] When the displacement of the closing handle of the power switch in the low-voltage switch cabinet of any preset electric valve reaches the threshold, or when the auxiliary contact corresponding to the power switch of any preset electric valve sends a tripping signal, or when the loudness at the power switch of any preset electric valve reaches the threshold, it is identified as a partial electric valve power failure, triggering a partial electric valve power failure alarm signal and a corresponding passivation control signal.

[0032] The identification equation is as follows:

[0033]

[0034] Where j represents the preset electric valve number; n represents the preset number of electric valves; D jh This indicates that a displacement threshold was detected at the power switch closing handle inside the preset electric valve low-voltage switchgear; C j This indicates that the auxiliary contact corresponding to the preset electric valve power switch has issued a trip signal; V jH This indicates that the loudness detected at the preset electric valve power switch has reached the threshold.

[0035] Preferably, the operating condition of the electric valve station is identified based on the operating condition signal set and / or auxiliary signal set. If an abnormal operating condition is identified, an abnormal operating condition alarm signal and a passivation control signal of the electric valve station are triggered, specifically including:

[0036] When it is detected that any preset regulating electric valve does not output a control command within the fourth forward time period, but the specified current exceeds the minimum current change in the normal regulation process, the pressure of the medium before and after the electric valve exceeds the pressure threshold change, the temperature of the medium before and after the electric valve exceeds the temperature threshold change, or the flow rate of the medium before and after the electric valve exceeds the corresponding flow rate change, it is identified as regulating electric valve vibration, triggering the regulating electric valve vibration alarm signal and the corresponding passivation control signal.

[0037] The identification equation is as follows:

[0038]

[0039] Where k represents the preset regulating electric valve number; l represents the number of preset regulating electric valves; Δt4 represents the fourth forward time interval; This indicates that the preset regulating electric valve is not outputting control commands; ΔI k This indicates that the specified current exceeds the minimum current variation during normal regulation; ΔP k ΔT represents the change in medium pressure across a preset regulating electric valve that exceeds a pressure threshold. k ΔQ represents the change in medium temperature before and after the preset regulating electric valve exceeding the temperature threshold; k This indicates the amount by which the flow rate of the medium before and after the preset regulating electric valve exceeds the flow threshold; the specified current includes the input current of the main cabinet working circuit, the output current of the main cabinet switching circuit, or the output current of the branch circuit of the expansion cabinet.

[0040] Preferably, the operating condition of the electric valve station is identified based on the operating condition signal set and / or auxiliary signal set. If an abnormal operating condition is identified, an abnormal operating condition alarm signal and a passivation control signal of the electric valve station are triggered, specifically including:

[0041] When the input voltage of the main working circuit of the low-voltage switchgear of the electric valve station is detected to be lower than the lower threshold or higher than the upper threshold, or when the input voltage of the main standby circuit of the low-voltage switchgear is detected to be lower than the lower threshold or higher than the upper threshold, or when the output voltage of the main switchgear switching or the branch output voltage of the extension cabinet is detected to be lower than the lower threshold or higher than the upper threshold, it is identified as the power supply voltage exceeding the limit, triggering the power supply voltage exceeding the limit alarm signal and the corresponding passivation control signal.

[0042] When the main cabinet switching output voltage or the expansion cabinet branch output voltage is detected to fluctuate beyond the threshold within a certain time period, it is identified as a large fluctuation in power supply voltage, triggering a large fluctuation alarm signal for power supply voltage and a corresponding passivation control signal.

[0043] When the interference voltage at the terminal of the mixed control cabinet exceeds the preset interference voltage threshold, it is identified as line electromagnetic interference, triggering a line electromagnetic interference alarm signal and a corresponding passivation control signal.

[0044] When an input power switching signal is detected at the auxiliary contact of the main cabinet changeover switch, it is identified as a power supply switchover, triggering a power supply switchover alarm signal and a corresponding passivation control signal.

[0045] Preferably, the operating condition of the electric valve station is identified based on the operating condition signal set and / or auxiliary signal set. If an abnormal operating condition is identified, an abnormal operating condition alarm signal and a passivation control signal of the electric valve station are triggered, specifically including:

[0046] When the temperature of any local power line surface in the low-voltage switchgear exceeds the preset temperature threshold, it is identified as local power line over-temperature, triggering a local power line over-temperature alarm signal and a corresponding passivation control signal.

[0047] When the humidity inside the low-voltage switchgear exceeds the set threshold, it is identified as dampness in the low-voltage switchgear, triggering a dampness alarm signal and a corresponding passivation control signal.

[0048] On the other hand, an abnormal operating condition identification and control system for an electric valve station includes:

[0049] The signal acquisition module is used to acquire the operating condition signal set of the low-voltage switchgear of the electric valve station and / or the auxiliary signal set of the electric valve station control cabinet; the operating condition signal set includes one or more of the following: main cabinet working circuit input voltage, main cabinet standby circuit input voltage, main cabinet working circuit input current, main cabinet standby circuit input current, main cabinet switching output voltage, main cabinet switching output current, main cabinet switching switch auxiliary contact, expansion cabinet branch output voltage, expansion cabinet branch output current, low-voltage switchgear internal temperature, low-voltage switchgear internal humidity, mixed control cabinet terminal interference voltage, low-voltage switchgear internal loudness, low-voltage switchgear internal closing handle displacement, and low-voltage switchgear internal circuit breaker auxiliary contact; the auxiliary signal set includes one or more of the following: electric valve front and rear medium parameters and electric valve control commands.

[0050] The electric valve station abnormal operating condition identification module is used to identify the operating condition of the electric valve station based on the operating condition signal set and / or auxiliary signal set. If an abnormal operating condition is identified, the module triggers the electric valve station abnormal operating condition alarm signal and passivation control signal.

[0051] The abnormal operating condition passivation control module is used to receive passivation control signals and execute corresponding passivation control.

[0052] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0053] (1) This invention differs from the self-diagnosis technology of electric actuator unit of electric valve. Based on the working condition signal set of the low-voltage switch cabinet of electric valve station and the auxiliary signal set of the control cabinet of electric valve station, it realizes the identification, early warning and passivation control of various electric valve fault modes, and provides an effective supplement to the fault diagnosis function of electric valve. Based on the segmentation of various faults of electric valve, it can be flexibly combined and matched as needed, which can improve the reliability of enterprise process system and reduce industrial accident losses.

[0054] (2) The abnormal operating condition identification method of the present invention is divided into two categories. One category is to form a mode judgment by collecting the operating condition signal in the low-voltage switch cabinet of the electric valve station according to a certain strategy, and actively suppress the fault by alarming the electric valve station control cabinet and / or triggering the electric valve function passivation. This category is a continuous monitoring and identification method. The other category is to trigger the mode identification by auxiliary signal of the electric valve station control cabinet. If the operating condition signal in the low-voltage switch cabinet is consistent with the pre-trained strategy, the corresponding fault mode judgment alarm and / or necessary fault suppression are triggered. This category is a pending intermittent monitoring and identification method. Based on these two categories of methods, multi-dimensional identification and early warning of electric valve faults can be achieved. Attached Figure Description

[0055] Figure 1 is a flowchart of the abnormal working condition identification and control method of electric valve station according to an embodiment of the present invention;

[0056] Figure 2 is a flowchart of the design of the abnormal working condition identification and control method for electric valve station according to an embodiment of the present invention.

[0057] Figure 3 is a structural block diagram of the electric valve station abnormal condition identification and control system according to an embodiment of the present invention;

[0058] Figure 4 is a structural diagram of the signal acquisition and abnormal working condition identification control module according to an embodiment of the present invention. Detailed Implementation

[0059] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0060] Terminology Explanation:

[0061] An electric valve, as a whole, consists of two parts: the valve itself and the electric actuator. Electric valves are widely used in industrial systems to control the flow of media and upstream and downstream process parameters. These electric valves are geographically dispersed, while their power load is concentrated in the low-voltage switchgear for electric valves (typically designed to house around 100 low-voltage power supplies for electric valves). Control signals are relatively concentrated in individual controllers of the industrial control system (generally, in DCS control system design, control units are divided according to process systems, and each individual control unit can centrally control commands for more than 50 electric valves). In this invention, the term "electric valve station" is used to define this collection of electric valves with relatively concentrated power loads and control signals. The source of signal acquisition within the low-voltage switchgear for electric valves is uniformly represented by "electric valve station low-voltage switchgear," the source of signal acquisition within the electric valve control system is uniformly represented by "electric valve station control cabinet," and individual valves are uniformly represented by "electric valve."

[0062] Referring to Figures 1 and 2, a method for identifying and controlling abnormal operating conditions of an electric valve station includes:

[0063] S101, collect the operating condition signal set of the low-voltage switchgear of the electric valve station and / or the auxiliary signal set of the electric valve station control cabinet; the operating condition signal set includes one or more of the following: main cabinet working circuit input voltage, main cabinet standby circuit input voltage, main cabinet working circuit input current, main cabinet standby circuit input current, main cabinet switching output voltage, main cabinet switching output current, main cabinet switching switch auxiliary contact, expansion cabinet branch output voltage, expansion cabinet branch output current, low-voltage switchgear internal temperature, low-voltage switchgear internal humidity, mixed control cabinet terminal interference voltage, low-voltage switchgear internal loudness, low-voltage switchgear internal closing handle displacement, and low-voltage switchgear internal circuit breaker auxiliary contact; the auxiliary signal set includes one or more of the following: electric valve front and rear medium parameters and electric valve control commands.

[0064] S102, Based on the operating condition signal set and / or auxiliary signal set, the operating condition of the electric valve station is identified. If an abnormal operating condition is identified, an abnormal operating condition alarm signal and a passivation control signal of the electric valve station are triggered.

[0065] S103, based on the passivation control signal, execute the corresponding passivation control.

[0066] In this embodiment, the control system can be a DCS control system or a PLC control system, specifically a control system actually used in an industrial field; it can also be a programmable controller embedded in a low-voltage switchgear. The configuration tool block used to implement the logical association represented by the identification equation can be a PLC, DCS control system, or programmable controller with functions including, but not limited to, multipliers, adders, upper and lower limit discriminators, sum and OR operations, counters, delays, registers, selectors, and first-output selectors.

[0067] Based on the aforementioned operating condition signal set and / or auxiliary signal set, the operating condition of the electric valve station is identified. If an abnormal operating condition is identified, the first application scenario for triggering the abnormal operating condition alarm signal and passivation control signal of the electric valve station is to identify the electric valve's failure to operate, specifically including:

[0068] When any preset electric valve is detected to have an output control command, and the specified current does not reach the lower limit of the normal current of the corresponding electric valve within the first fixed time after the control command is triggered, or the pressure, temperature and flow of the medium before and after the electric valve do not exceed the corresponding threshold change, it is identified as the electric valve refusing to operate, and the electric valve refusing to operate alarm signal and the corresponding passivation control signal are triggered.

[0069] The identification equation is as follows:

[0070]

[0071] Where j represents the preset electric valve number; n represents the preset number of electric valves; Δt1 represents the first fixed time after the control command is triggered; F j This indicates that the electric valve outputs control commands; This indicates that the specified current has not reached the lower limit of the normal operating current of the electric valve; This indicates that the pressure change of the medium before and after the electric valve did not exceed the pressure threshold. This indicates that the temperature change of the medium before and after the electric valve did not exceed the temperature threshold. This indicates that the change in medium flow before and after the electric valve does not exceed the flow threshold; the specified current includes the input current of the main cabinet working circuit, the output current of the main cabinet switching circuit, or the output current of the branch circuit of the expansion cabinet.

[0072] In the above formulas, the summation operation indicates that if any preset electric valve meets the conditions in the formula, an electric valve failure alarm signal will be triggered; · represents an AND operation; + represents an OR operation. Subsequent formulas use the same symbols with the same meaning.

[0073] It should be noted that in this embodiment, the specified current includes the main cabinet working circuit input current, the main cabinet switching output current, or the expansion cabinet branch output current. Generally, priority is given to the closer end based on electrical distance. That is, if the electric valve electrical circuit is pre-installed in the expansion cabinet, the expansion cabinet branch output current is used as the identification signal. The main cabinet switching output current uses a first preset proportional coefficient as the first backup identification signal, and the main cabinet working circuit input current uses a second preset proportional coefficient as the second backup identification signal. The corresponding current selection equation is as follows:

[0074]

[0075] In the above formula, I jIndicates the current selection signal, I jC I represents the output current of the expansion cabinet branch that matches the preset electric valve. jO I represents the main cabinet switching output current with an additional first preset proportional coefficient. jI This indicates the main cabinet working circuit input current with an additional second preset proportional coefficient. During low-voltage switchgear operation, if a switchover occurs, the original main cabinet standby circuit input current will be activated by the auxiliary contacts of the switching switch to become the main cabinet working circuit input current; ∨ indicates the OR selection operation of two analog data. This indicates the merging of two analog data points with a certain proportional coefficient.

[0076] Specifically, the electric valve failure design establishes a logical association between the preset electric valve control command (generally a critical electric valve) and the specified current and the media before and after the preset electric valve. When the preset electric valve control command is issued by a PLC, DCS control system, or programmable controller, the identification module based on the aforementioned identification equation is activated. This module calculates the change in the specified current over a first predetermined time period after the control command is triggered, as well as the changes in the pressure, temperature, and flow rate of the media before and after the electric valve over the same period. If neither the specified current value nor the changes in the media before and after the control command exceed the threshold, the PLC, DCS control system, or programmable controller can output an electric valve failure alarm.

[0077] Based on the aforementioned operating condition signal set and / or auxiliary signal set, the operating condition of the electric valve station is identified. If an abnormal operating condition is identified, the second application scenario that triggers the abnormal operating condition alarm signal and passivation control signal of the electric valve station is to identify valve maloperation, specifically including:

[0078] When it is detected that all preset electric valves have not output control commands within the second forward time period, but the specified current reaches the minimum value of the lower limit of the normal operating current of the electric valve, or when it is detected that any preset electric valve has not output control commands within the second forward time period, but two of the media parameters before and after the corresponding electric valve exceed the corresponding threshold change, it is identified as a malfunction of the electric valve, triggering the electric valve malfunction alarm signal and the corresponding passivation control signal.

[0079] The identification equation is as follows:

[0080]

[0081] Where j represents the preset electric valve number; n represents the preset number of electric valves; min(I jL ) indicates the minimum value at which the specified current reaches the lower limit of the normal operating current of the electric valve; Δt2 indicates the second forward fixed time period; This indicates that the preset electric valve is not outputting control commands; This indicates that all preset electric valve control commands have not been triggered; ΔP j ΔT represents the change in medium pressure before and after the electric valve exceeding the pressure threshold; j ΔQ represents the change in medium temperature before and after the electric valve exceeding the temperature threshold; j This indicates the amount by which the flow rate of the medium before and after the electric valve exceeds the flow threshold; the specified current includes the input current of the main cabinet working circuit, the output current of the main cabinet switching circuit, or the output current of the branch circuit of the expansion cabinet. The second forward time interval indicates the forward time interval triggered when the specified current reaches the lower limit of the normal operating current of the electric valve or when two of the medium parameters before and after the electric valve exceed the corresponding threshold changes.

[0082] Specifically, the design for preventing electric valve malfunction involves forming a logical association set between the control commands of the electric actuators of important electric valves, the switching output current of the main control cabinet of the designated valve station, and the media parameters before and after the important electric valves. When the PLC, DCS control system, or programmable controller detects that the specified current reaches the minimum value of the lower limit of the normal operating current of the electric valve, or that two of the preset media parameters before and after the electric valve exceed the corresponding threshold changes, the identification module based on the above identification equation is activated. If the preset electric valve control commands within a second forward time period have not been issued, the PLC, DCS control system, or programmable controller can output a valve malfunction alarm.

[0083] Based on the aforementioned operating condition signal set and / or auxiliary signal set, the operating condition of the electric valve station is identified. If an abnormal operating condition is identified, the third application scenario that triggers the abnormal operating condition alarm signal and passivation control signal of the electric valve station is to identify excessive torque in the electric valve, specifically including:

[0084] When the specified current is detected to reach the second threshold of high load current of the low-voltage switchgear of the electric valve station, or when the specified current is detected to reach the first threshold of high load current of the low-voltage switchgear of the electric valve station and the electric valve has not been triggered due to malfunction within a third forward time period, the number of simultaneous trigger commands of all preset electric valves is not less than the number of media changes before and after the preset electric valve, it is identified as the electric valve is over-torque, and the electric valve over-torque alarm signal and the corresponding passivation control signal are triggered.

[0085] The identification equation is as follows:

[0086]

[0087]

[0088] Among them, I H2 This indicates the second threshold value for high-load current in the low-voltage switchgear of the electric valve station; I H1Δt3 represents the first threshold value for high load current in the low-voltage switchgear of the electric valve station; Δt3 represents the third forward fixed time period. This indicates that the electric valve malfunctioned and was not triggered; CNT(F) j CNT(ΔP) represents the number of commands that can be triggered simultaneously by all preset electric valves; j ·ΔT j +ΔT j ·ΔQ j +ΔP j ·ΔQ j ) represents the number of media changes before and after all preset electric valves; j represents the preset electric valve number; n represents the number of preset electric valves; F j This indicates the control command for the electric valve; ΔP j ΔT represents the change in medium pressure before and after the electric valve exceeding the pressure threshold; j ΔQ represents the change in medium temperature before and after the electric valve exceeding the temperature threshold; j This indicates the amount by which the flow rate of the medium before and after the electric valve exceeds the flow threshold; the specified current includes the input current of the main cabinet working circuit, the output current of the main cabinet switching circuit, or the output current of the branch circuit of the expansion cabinet. The third forward fixed length refers to the forward fixed time when the specified current reaches the first threshold of high load current of the low-voltage switchgear of the electric valve station to trigger.

[0089] Specifically, the electric valve over-torque design incorporates a logical association set of specified current, electric valve control commands, upstream and downstream medium parameters, and electric valve malfunction identification signals. When the PLC, DCS control system, or programmable controller detects that the specified current reaches the first threshold of high-load current in the low-voltage switchgear of the electric valve station, it activates the identification module based on the aforementioned identification equation. It then searches for electric valve malfunction identification signals within a third forward time period. If no such signals are issued, or if the number of simultaneous trigger commands for all preset electric valves within the third forward time period is not less than the preset number of upstream and downstream medium changes, or if it is directly triggered based on a higher second threshold of high-load current in the low-voltage switchgear of the electric valve station, it outputs an important electric valve over-torque alarm.

[0090] The fourth application scenario for identifying the operating condition of an electric valve station based on the aforementioned operating condition signal set and / or auxiliary signal set, and triggering an abnormal operating condition alarm signal and passivation control signal for the electric valve station if an abnormal operating condition is identified, is to identify the no-load stall of the electric valve, specifically including:

[0091] When any preset electric valve is detected to have an output control command, and the pressure, temperature and flow rate of the medium before and after the electric valve do not exceed the corresponding threshold changes within the first fixed time period after the control command is triggered, and the specified current reaches the maximum no-load current, it is identified as no-load stall of the electric valve, triggering the no-load stall alarm signal and the corresponding passivation control signal of the electric valve.

[0092] The identification equation is as follows:

[0093]

[0094] Where max(I) oH ) indicates that the specified current has reached the maximum no-load current; j indicates the preset electric valve number; n indicates the preset number of electric valves; Δt1 indicates the first fixed time after the control command is triggered; F j This indicates that the electric valve outputs control commands; This indicates that the pressure change of the medium before and after the electric valve did not exceed the pressure threshold. This indicates that the temperature change of the medium before and after the electric valve did not exceed the temperature threshold. This indicates that the change in medium flow before and after the electric valve does not exceed the flow threshold; the specified current includes the input current of the main cabinet working circuit, the output current of the main cabinet switching circuit, or the output current of the branch circuit of the expansion cabinet.

[0095] Specifically, the no-load stall design of the electric valve is to form a logical association set between the specified current, the electric valve control command, and the parameters of the medium before and after the electric valve. When the preset electric valve control command is issued by the PLC, DCS control system, or programmable controller, the recognition module based on the above recognition equation is activated. It calculates the change in the specified current value within the first fixed time period after the control command is triggered, and also calculates the changes in the pressure, temperature, and flow rate of the medium before and after the electric valve within the same fixed time period. If the specified current value reaches the maximum no-load current threshold, and the changes in the medium before and after the electric valve within the fixed time period do not reach the threshold, then the electric valve is considered to have no-load stall, and the PLC, DCS control system, or programmable controller will output an electric valve no-load stall alarm.

[0096] The fifth application scenario for identifying the operating condition of an electric valve station based on the aforementioned operating condition signal set and / or auxiliary signal set, and triggering the electric valve station abnormal operating condition alarm signal and passivation control signal if an abnormal operating condition is identified, is to identify partial power failure of electric valves, specifically including:

[0097] When the displacement of the closing handle of the power switch in the low-voltage switch cabinet of any preset electric valve reaches the threshold, or when the auxiliary contact corresponding to the power switch of any preset electric valve sends a trip signal (corresponding to the auxiliary contact of the circuit breaker in the low-voltage switch cabinet), or when the loudness at the power switch of any preset electric valve reaches the threshold, it is identified as a partial electric valve power failure, triggering a partial electric valve power failure alarm signal and a corresponding passivation control signal.

[0098] The identification equation is as follows:

[0099]

[0100] Where j represents the preset electric valve number; n represents the preset number of electric valves; D jH This indicates that a displacement threshold was detected at the power switch closing handle inside the preset electric valve low-voltage switchgear; C j This indicates that the auxiliary contact corresponding to the preset electric valve power switch has issued a trip signal; V jH This indicates that the loudness detected at the preset electric valve power switch has reached the threshold.

[0101] Specifically, a sound-activated switch is installed inside the low-voltage switchgear for electric valves, and alarm auxiliary contacts or displacement switches are installed on the power switches of important electric valves. When a circuit breaker in the low-voltage switchgear for electric valves trips, the preset sound-activated switch receives a threshold sound level, and the PLC, DCS control system, or programmable controller outputs a preset electric valve power failure alarm. If the preset electric valve power switch alarm auxiliary contact or displacement switch actuates, the PLC, DCS control system, or programmable controller outputs a preset electric valve power failure alarm.

[0102] Based on the aforementioned operating condition signal set and / or auxiliary signal set, the operating condition of the electric valve station is identified. If an abnormal operating condition is identified, the sixth application scenario that triggers the abnormal operating condition alarm signal and passivation control signal of the electric valve station is to identify the vibration of the regulating electric valve, specifically including:

[0103] When it is detected that any preset regulating electric valve does not output a control command within the fourth forward time period, but the specified current exceeds the minimum current change in the normal regulation process, the pressure of the medium before and after the electric valve exceeds the pressure threshold change, the temperature of the medium before and after the electric valve exceeds the temperature threshold change, or the flow rate of the medium before and after the electric valve exceeds the corresponding flow rate change, it is identified as regulating electric valve vibration, triggering the regulating electric valve vibration alarm signal and the corresponding passivation control signal.

[0104] The identification equation is as follows:

[0105]

[0106] Where k represents the preset regulating electric valve number; l represents the number of preset regulating electric valves; Δt4 represents the fourth forward time interval; This indicates that the preset regulating electric valve is not outputting control commands; ΔI k This indicates that the specified current exceeds the minimum current variation during normal regulation; ΔP k ΔT represents the change in medium pressure across a preset regulating electric valve that exceeds a pressure threshold. k ΔQ represents the change in medium temperature before and after the preset regulating electric valve exceeding the temperature threshold;k This indicates the amount by which the flow rate of the medium before and after the preset regulating electric valve exceeds the flow threshold; the specified current includes the input current of the main cabinet working circuit, the output current of the main cabinet switching circuit, or the output current of the branch circuit of the extension cabinet. The fourth forward time limit indicates the forward time limit triggered when the specified current exceeds the minimum current change during the normal regulation process or when the medium parameters before and after the electric valve exceed the corresponding change.

[0107] Specifically, the design for regulating electric valve vibration detection establishes a logical association between the specified current, the regulating electric valve control command, and the parameters of the medium before and after the regulating electric valve. When the PLC, DCS control system, or programmable controller detects that the specified current reaches the minimum current variation during normal regulation, the pressure change of the medium before and after the regulating electric valve exceeds the pressure threshold, the temperature change of the medium before and after the regulating electric valve exceeds the temperature threshold, or the flow rate of the medium before and after the regulating electric valve exceeds the corresponding flow rate change, the identification module based on the above identification equation is activated. It searches for the 4-20mA control command for the regulating electric valve within a four-preceding time frame. If no such command is issued, it is considered that the regulating electric valve is vibrating, and the PLC, DCS control system, or programmable controller outputs a regulating electric valve vibration alarm. It should be noted that the formula only represents the preset trigger sensitivity; the regulating electric valve vibration detection can also be adjusted according to the false alarm rate. The ΔP in the M6 ​​formula... k ΔT k and ΔQ k Similarly, it can be corrected to ΔP in M2 and M3. j ΔT j and ΔQ j The "two out of three" logic method can be used to reduce the false alarm rate, or the alarm can be output after being triggered two or more times consecutively within a certain period of time using the aforementioned identification method. Similarly, formulas M2 and M3 can also use single-point triggering logic, as in formula M6, to reduce the false alarm rate.

[0108] The seventh application scenario for identifying the operating condition of an electric valve station based on the aforementioned operating condition signal set and / or auxiliary signal set, and triggering the abnormal operating condition alarm signal and passivation control signal of the electric valve station if an abnormal operating condition is identified, is to identify power supply voltage exceeding the limit, specifically including:

[0109] When the input voltage of the main working circuit of the low-voltage switchgear of the electric valve station is detected to be lower than the lower threshold or higher than the upper threshold, or when the input voltage of the main standby circuit of the low-voltage switchgear is detected to be lower than the lower threshold or higher than the upper threshold, or when the output voltage of the main switchgear switching or the branch output voltage of the extension cabinet is detected to be lower than the lower threshold or higher than the upper threshold, it is identified as the power supply voltage exceeding the limit, triggering the power supply voltage exceeding the limit alarm signal and the corresponding passivation control signal.

[0110] The identification equation is as follows:

[0111] M7 = U AL +U AH +U BL +U BH +U OL +U oH

[0112] Among them, U AL This indicates that the input voltage of the main working circuit of the low-voltage switchgear is lower than the lower threshold; U AH This indicates that the input voltage of the main working circuit of the low-voltage switchgear exceeds the upper limit threshold; U BL This indicates that the input voltage of the main cabinet's standby circuit in the low-voltage switchgear is below the lower threshold (generally 70% of 380V); U BH This indicates that the input voltage of the main cabinet standby circuit of the low-voltage switchgear exceeds the upper limit threshold (generally 110% of 380V); U OL This indicates that the main cabinet switching output voltage or the expansion cabinet branch output voltage is below the lower threshold; U OH This indicates that the main cabinet switching output voltage or the branch output voltage of the expansion cabinet exceeds the upper limit threshold.

[0113] Specifically, upper and lower threshold values ​​for the power supply voltage are set in the PLC, DCS control system, or programmable controller. The input voltage of the main cabinet's working circuit, the input voltage of the main cabinet's standby circuit, and the output voltage of the main cabinet's switching circuit are continuously monitored. When any signal value exceeds the upper or lower threshold value, the PLC, DCS control system, or programmable controller outputs a power supply voltage over-limit alarm.

[0114] Based on the aforementioned operating condition signal set and / or auxiliary signal set, the operating condition of the electric valve station is identified. If an abnormal operating condition is identified, the eighth application scenario that triggers the abnormal operating condition alarm signal and passivation control signal of the electric valve station is to identify large fluctuations in the power supply voltage, specifically including:

[0115] When the main cabinet switching output voltage or the expansion cabinet branch output voltage is detected to fluctuate beyond the threshold within the fifth fixed time period, it is identified as a large fluctuation of the power supply voltage, triggering a large fluctuation alarm signal for the power supply voltage and the corresponding passivation control signal.

[0116] The identification equation is as follows:

[0117] M8=Δt5·(ΔU O +ΔU C )

[0118] Where Δt5 represents the fifth fixed time interval; ΔU O This indicates that the main cabinet switching output voltage fluctuation exceeds the threshold, ΔU C This indicates that the voltage fluctuation of the branch output of the expansion cabinet exceeds the threshold.

[0119] Specifically, a voltage fluctuation threshold is set in the PLC, DCS control system or programmable controller to continuously monitor the main cabinet switching output voltage and the expansion cabinet branch output voltage. If the fluctuation of the main cabinet switching output voltage or the expansion cabinet branch output voltage exceeds the threshold within a certain time period, the PLC, DCS control system or programmable controller will output a large power supply voltage fluctuation alarm.

[0120] Based on the aforementioned operating condition signal set and / or auxiliary signal set, the operating condition of the electric valve station is identified. If an abnormal operating condition is identified, the ninth application scenario that triggers the abnormal operating condition alarm signal and passivation control signal of the electric valve station is to identify line electromagnetic interference, specifically including:

[0121] When the interference voltage at the terminal of the mixed control cabinet exceeds the preset interference voltage threshold, it is identified as line electromagnetic interference, triggering a line electromagnetic interference alarm signal and a corresponding passivation control signal.

[0122] The identification equation is as follows:

[0123]

[0124] Where i represents the mixed-assembly electric valve number; m represents the number of mixed-assembly electric valves; U iH This indicates that the preset interference voltage at the terminals of the mixed electric valve exceeds the preset interference voltage threshold.

[0125] Specifically, the interference voltage of the preset mixed electric valve terminals is continuously monitored by installing interference voltage measurement sensors in the mixed control cabinet, but not limited to. Interference voltage thresholds are set in the PLC, DCS control system or programmable controller. When the interference voltage of any preset mixed electric valve terminal exceeds the preset interference voltage threshold, the valve command and signal are passivated, and an electromagnetic interference alarm for the valve control circuit is output.

[0126] Based on the aforementioned operating condition signal set and / or auxiliary signal set, the operating condition of the electric valve station is identified. If an abnormal operating condition is identified, the tenth application scenario that triggers the abnormal operating condition alarm signal and passivation control signal of the electric valve station is to identify power supply switching, specifically including:

[0127] When an input power switching signal is detected at the auxiliary contact of the main cabinet switch, it is identified as a power supply switch, triggering a power supply switch alarm signal and a corresponding passivation control signal.

[0128] The identification equation is as follows:

[0129] M 100 =KC O

[0130] Among them, KC O This indicates that the auxiliary contact of the main cabinet changeover switch has generated an input power switching signal.

[0131] Specifically, the auxiliary contacts of the main cabinet switching switch are continuously monitored. When the PLC, DCS control system or programmable controller detects a jump in the auxiliary contacts of the main cabinet switching switch, it completes a count in the internal counter and outputs a power supply switching alarm.

[0132] Based on the aforementioned operating condition signal set and / or auxiliary signal set, the operating condition of the electric valve station is identified. If an abnormal operating condition is identified, the eleventh application scenario that triggers the abnormal operating condition alarm signal and passivation control signal of the electric valve station is to identify local power line overheating, specifically including:

[0133] When the temperature of any local power line surface in the low-voltage switchgear exceeds the preset temperature threshold, it is identified as local power line over-temperature, triggering a local power line over-temperature alarm signal and a corresponding passivation control signal.

[0134] The identification equation is as follows:

[0135]

[0136] Where k represents the power line number; s represents the number of preset local power lines; CT jH This indicates that the cable temperature of the corresponding numbered line exceeds the threshold, which is set according to the maximum power operation period of heat source equipment near the switchgear during high summer temperatures.

[0137] Specifically, various temperature sensors, including infrared temperature sensors and surface-mount temperature sensors, are installed in the low-voltage switchgear to continuously monitor the surface temperature of preset local power lines. A temperature threshold is set in the PLC, DCS control system, or programmable logic controller (PLC). If the surface temperature of the preset local power line exceeds the set threshold, the PLC, DCS control system, or PLC outputs an over-temperature alarm for the power line.

[0138] Based on the aforementioned operating condition signal set and / or auxiliary signal set, the operating condition of the electric valve station is identified. If an abnormal operating condition is identified, the twelfth application scenario that triggers the abnormal operating condition alarm signal and passivation control signal of the electric valve station is to identify moisture in the low-voltage switchgear, specifically including:

[0139] When the humidity inside the low-voltage switchgear exceeds the set threshold, it is identified as the low-voltage switchgear is damp, triggering a low-voltage switchgear damp alarm signal and a corresponding passivation control signal.

[0140] The identification equation is as follows:

[0141] M12 =HU MH

[0142] Among them, HU MH This indicates that the humidity of the specified low-voltage switchgear exceeds the threshold; the threshold is set according to the training test quantity during the rainy season when there is high humidity and the steam and water pipes near the switchgear leak but the low pressure or flow alarm of the pipe is not triggered.

[0143] Specifically, humidity sensors, including but not limited to absolute or relative humidity sensors, are installed inside the low-voltage switchgear for continuous monitoring. A humidity alarm threshold is set in the PLC, DCS control system, or programmable controller. When the humidity inside the low-voltage switchgear exceeds the set threshold, the PLC, DCS control system, or programmable controller outputs a moisture alarm for the low-voltage switchgear.

[0144] The passivation control signal is specifically manifested as control commands. For preset electric valves (important electric valves), it includes, but is not limited to, delaying, clipping, interrupting, and locking the control commands for preset electric valves; issuing safety set commands to preset electric valves to activate them to the valve switch positions that ensure the safety of the process system and flow; and issuing remote power-off commands to the air switches in the low-voltage switchgear corresponding to the preset electric valves, immediately braking them to the current valve switch positions. For application scenarios seven through twelfth, the passivation control commands include, but are not limited to, remote main cabinet switching switch switching commands triggered by fluctuations in the working circuit input voltage; delaying, clipping, interrupting, and locking the control commands for electric valves in the corresponding power supply area triggered by local over-temperature, moisture, or over-limit voltage in the expansion cabinet branch; triggering remote power-off commands to the power switches of non-important electric valves in the corresponding power supply area, so that the power load in that area is concentrated to protect the important electric valves; and issuing safety set commands and power supply disconnect commands to the corresponding electric valves after electromagnetic interference identification in the mixed cabinet.

[0145] It should be noted that in specific applications, one or more of the above 12 scenarios can be selected and combined arbitrarily according to the needs of production and site layout to implement abnormal working condition identification and control of electric valve stations.

[0146] Referring to Figure 3, an abnormal operating condition identification and control system for an electric valve station includes:

[0147] The signal acquisition module 301 is used to acquire the operating condition signal set of the low-voltage switchgear of the electric valve station and / or the auxiliary signal set of the electric valve station control cabinet; the operating condition signal set includes one or more of the following: main cabinet working circuit input voltage, main cabinet standby circuit input voltage, main cabinet working circuit input current, main cabinet standby circuit input current, main cabinet switching output voltage, main cabinet switching output current, main cabinet switching switch auxiliary contact, expansion cabinet branch output voltage, expansion cabinet branch output current, low-voltage switchgear internal temperature, low-voltage switchgear internal humidity, mixed control cabinet terminal interference voltage, low-voltage switchgear internal loudness, low-voltage switchgear internal closing handle displacement, and low-voltage switchgear internal circuit breaker auxiliary contact; the auxiliary signal set includes one or more of the following: electric valve front and rear medium parameters and electric valve control commands.

[0148] The electric valve station abnormal operating condition identification module 302 is used to identify the operating condition of the electric valve station based on the operating condition signal set and / or auxiliary signal set. If an abnormal operating condition is identified, the module triggers the electric valve station abnormal operating condition alarm signal and passivation control signal.

[0149] The abnormal operating condition passivation control module 303 is used to receive passivation control signals and execute corresponding passivation control.

[0150] Specifically, as shown in Figure 4, the signal acquisition module 301 obtains the corresponding signal sets from the main cabinet, expansion cabinet, mixed control cabinet and control system cabinet.

[0151] The abnormal operating condition identification module 302 and the abnormal operating condition passivation control module 303 of the electric valve station can be implemented based on the above identification equation. Specifically, they are identification and control systems composed of the collected operating condition signal set and / or auxiliary signal set in a PLC, DCS control system or programmable controller.

[0152] The specific implementation of an abnormal operating condition identification and control system for an electric valve station is the same as the abnormal operating condition identification and control method for an electric valve station, and will not be described again in this embodiment.

[0153] The above are merely specific embodiments of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial modifications made to the present invention using this concept shall be considered as infringing upon the protection scope of the present invention.

Claims

1. A method for identifying and controlling abnormal operating conditions of an electric valve station, characterized in that, include: The system collects the operating condition signal set of the low-voltage switchgear of the electric valve station and / or the auxiliary signal set of the electric valve station control cabinet; the operating condition signal set includes one or more of the following: main cabinet working circuit input voltage, main cabinet standby circuit input voltage, main cabinet working circuit input current, main cabinet standby circuit input current, main cabinet switching output voltage, main cabinet switching output current, main cabinet switching switch auxiliary contacts, expansion cabinet branch output voltage, expansion cabinet branch output current, low-voltage switchgear internal temperature, low-voltage switchgear internal humidity, mixed control cabinet terminal interference voltage, low-voltage switchgear internal loudness, low-voltage switchgear internal closing handle displacement, and low-voltage switchgear internal circuit breaker auxiliary contacts; the auxiliary signal set includes one or more of the following: electric valve upstream and downstream medium parameters and electric valve control commands; based on the operating condition signal set and / or auxiliary signals... The system uses a set of signal sets to identify the operating conditions of the electric valve station. If an abnormal operating condition is identified, an abnormal operating condition alarm signal and a passivation control signal are triggered. Based on the passivation control signal, corresponding passivation control is executed. The system also uses the operating condition signal set and / or auxiliary signal set to identify the operating conditions of the electric valve station. If an abnormal operating condition is identified, an abnormal operating condition alarm signal and a passivation control signal are triggered. Specifically, when any preset electric valve is detected to have an output control command, and the specified current does not reach the lower limit of the normal current of the corresponding electric valve within a first fixed time period after the control command is triggered, or the pressure, temperature, and flow rate of the medium before and after the electric valve do not exceed the corresponding threshold changes, it is identified as an electric valve failure to operate, triggering an electric valve failure to operate alarm signal and a corresponding passivation control signal. The identification equation is as follows: Where j represents the preset electric valve number; n represents the preset number of electric valves; Δt1 represents the first fixed time after the control command is triggered; F j This indicates that the electric valve outputs control commands; This indicates that the specified current has not reached the lower limit of the normal operating current of the electric valve; This indicates that the pressure change of the medium before and after the electric valve did not exceed the pressure threshold. This indicates that the temperature change of the medium before and after the electric valve did not exceed the temperature threshold. This indicates that the change in medium flow before and after the electric valve does not exceed the flow threshold; the specified current includes the input current of the main cabinet working circuit, the output current of the main cabinet switching circuit, or the output current of the branch circuit of the expansion cabinet.

2. The method for identifying and controlling abnormal operating conditions of an electric valve station according to claim 1, characterized in that, Based on the aforementioned operating condition signal set and / or auxiliary signal set, the operating condition of the electric valve station is identified. If an abnormal operating condition is identified, an abnormal operating condition alarm signal and a passivation control signal of the electric valve station are triggered. This also includes: when it is detected that all preset electric valves have not output control commands within a second forward time period, but the specified current reaches the minimum value of the lower bound of the normal operating current of the electric valve; or when it is detected that any preset electric valve has not output control commands within a second forward time period, but two of the corresponding medium parameters before and after the electric valve exceed the corresponding threshold changes, it is identified as a malfunction of the electric valve, triggering an electric valve malfunction alarm signal and the corresponding passivation control signal. The identification equation is as follows: Wherein, min(I jL ) indicates the minimum value at which the specified current reaches the lower limit of the normal operating current of the electric valve; Δt2 indicates the second forward fixed time period; This indicates that the preset electric valve is not outputting control commands; This indicates that all preset electric valve control commands have not been triggered; ΔP j ΔT represents the change in medium pressure before and after the electric valve exceeding the pressure threshold; j ΔQ represents the change in temperature of the medium before and after the electric valve exceeding the temperature threshold. j This indicates the amount by which the flow rate of the medium before and after the electric valve exceeds the flow threshold; the specified current includes the input current of the main cabinet working circuit, the output current of the main cabinet switching circuit, or the output current of the branch circuit of the expansion cabinet.

3. The method for identifying and controlling abnormal operating conditions of an electric valve station according to claim 2, characterized in that, Based on the aforementioned operating condition signal set and / or auxiliary signal set, the operating condition of the electric valve station is identified. If an abnormal operating condition is identified, an abnormal operating condition alarm signal and a passivation control signal of the electric valve station are triggered. This also includes: when a specified current is detected to reach the second threshold of high load current for the low-voltage switchgear of the electric valve station, or when a specified current is detected to reach the first threshold of high load current for the low-voltage switchgear of the electric valve station and the electric valve has not been malfunctioning within a third forward predetermined time period, the number of simultaneous trigger commands for all preset electric valves is not less than the number of media changes before and after the preset electric valve, indicating that the electric valve is under excessive torque, an over-torque alarm signal and a corresponding passivation control signal are triggered. The identification equation is as follows: Among them, I H2 This indicates the second threshold value for high-load current in the low-voltage switchgear of the electric valve station; I H1 Δt3 represents the first threshold value for high load current in the low-voltage switchgear of the electric valve station; Δt3 represents the third forward fixed time period. This indicates that the electric valve malfunctioned and was not triggered; CNT(F) j (Indicates the number of commands that can be triggered simultaneously by all preset electric valves; CNT(ΔP) j ·ΔT j +ΔT j ·ΔQ j +ΔP j ·ΔQ j ) represents the change in medium before and after all preset electric valves; ΔP j ΔT represents the change in medium pressure before and after the electric valve exceeding the pressure threshold; j ΔQ represents the change in temperature of the medium before and after the electric valve exceeding the temperature threshold. j This indicates the amount by which the flow rate of the medium before and after the electric valve exceeds the flow threshold; the specified current includes the input current of the main cabinet working circuit, the output current of the main cabinet switching circuit, or the output current of the branch circuit of the expansion cabinet.

4. The method for identifying and controlling abnormal operating conditions of an electric valve station according to claim 1, characterized in that, Based on the aforementioned operating condition signal set and / or auxiliary signal set, the operating condition of the electric valve station is identified. If an abnormal operating condition is identified, an abnormal operating condition alarm signal and a passivation control signal of the electric valve station are triggered. The process also includes: when any preset electric valve is detected to have an output control command, and within a first fixed time period after the control command is triggered, the pressure, temperature, and flow rate of the medium before and after the electric valve do not exceed the corresponding threshold changes, and the specified current reaches the maximum no-load current, the electric valve is identified as experiencing no-load stall, triggering an electric valve no-load stall alarm signal and a corresponding passivation control signal. The identification equation is as follows: Where max(I) oH This indicates that the specified current has reached the maximum no-load current.

5. The method for identifying and controlling abnormal operating conditions of an electric valve station according to claim 1, characterized in that, Based on the aforementioned operating condition signal set and / or auxiliary signal set, the operating condition of the electric valve station is identified. If an abnormal operating condition is identified, an abnormal operating condition alarm signal and a passivation control signal of the electric valve station are triggered. This also includes: when it is detected that any preset regulating electric valve has not output a control command within a fourth forward time period, but the specified current exceeds the minimum current variation during normal regulation, the pressure change of the medium before and after the electric valve exceeds the pressure threshold change, the temperature change of the medium before and after the electric valve exceeds the temperature threshold change, or the flow rate of the medium before and after the electric valve exceeds the corresponding flow rate change, it is identified as regulating electric valve vibration, triggering a regulating electric valve vibration alarm signal and a corresponding passivation control signal. The identification equation is as follows: Where k represents the preset regulating electric valve number; l represents the number of preset regulating electric valves; Δt4 represents the fourth forward time interval; This indicates that the preset regulating electric valve is not outputting control commands; ΔI k This indicates that the specified current exceeds the minimum current variation during normal regulation; ΔP k ΔT represents the change in medium pressure across a preset regulating electric valve that exceeds a pressure threshold. k ΔQ represents the change in medium temperature before and after the preset regulating electric valve exceeding the temperature threshold; k This indicates the amount by which the flow rate of the medium before and after the preset regulating electric valve exceeds the flow threshold; the specified current includes the input current of the main cabinet working circuit, the output current of the main cabinet switching circuit, or the output current of the branch circuit of the expansion cabinet.

6. A system for identifying and controlling abnormal operating conditions of an electric valve station, characterized in that, include: The signal acquisition module is used to acquire the operating condition signal set of the low-voltage switchgear of the electric valve station and / or the auxiliary signal set of the electric valve station control cabinet; the operating condition signal set includes one or more of the following: main cabinet working circuit input voltage, main cabinet standby circuit input voltage, main cabinet working circuit input current, main cabinet standby circuit input current, main cabinet switching output voltage, main cabinet switching output current, main cabinet switching switch auxiliary contacts, expansion cabinet branch output voltage, expansion cabinet branch output current, low-voltage switchgear internal temperature, low-voltage switchgear internal humidity, mixed control cabinet terminal interference voltage, low-voltage switchgear internal loudness, low-voltage switchgear internal closing handle displacement, and low-voltage switchgear internal circuit breaker auxiliary contacts; the auxiliary signal set includes one or more of the following: electric valve front and rear medium parameters and electric valve control commands; The abnormal operating condition identification module for the electric valve station is used to identify the operating condition of the electric valve station based on the operating condition signal set and / or auxiliary signal set. If an abnormal operating condition is identified, an abnormal operating condition alarm signal and a passivation control signal are triggered. The abnormal operating condition passivation control module is used to receive the passivation control signal and execute the corresponding passivation control. Specifically, the abnormal operating condition identification module for the electric valve station is used to: identify the electric valve as refusing to operate when any preset electric valve is detected to have an output control command, and the specified current does not reach the lower limit of the normal current of the corresponding electric valve or the pressure, temperature, and flow rate of the medium before and after the electric valve do not exceed the corresponding threshold change within a first fixed time period after the control command is triggered, and trigger the electric valve refusing to operate alarm signal and the corresponding passivation control signal. The identification equation is as follows: Where j represents the preset electric valve number; n represents the preset number of electric valves; Δt1 represents the first fixed time after the control command is triggered; F j This indicates that the electric valve outputs control commands; This indicates that the specified current has not reached the lower limit of the normal operating current of the electric valve; This indicates that the pressure change of the medium before and after the electric valve did not exceed the pressure threshold. This indicates that the temperature change of the medium before and after the electric valve did not exceed the temperature threshold. This indicates that the change in medium flow before and after the electric valve does not exceed the flow threshold; the specified current includes the input current of the main cabinet working circuit, the output current of the main cabinet switching circuit, or the output current of the branch circuit of the expansion cabinet.

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