CN116163938A - Water supply pump operation switching method, device, system and storage medium - Google Patents

Abstract

The invention relates to a water supply pump operation switching method, a device, a system and a storage medium, wherein the method is applied to a water supply system, the water supply system comprises a main operation pump and a standby pump, the main operation pump is a variable frequency water pump, and the standby pump is a power frequency liquid coupling pump; the method comprises the following steps: under the condition that the standby pump input condition is true and the main operation pump is not stopped by fault, the control instruction of the standby pump tracks the variable frequency instruction of the main operation pump; and under the condition that the main operation pump fails and stops running, the standby pump is started in an interlocking way to supply water, and the control instruction is switched into a scoop tube instruction corresponding to the variable frequency instruction. According to the embodiment of the disclosure, the frequency conversion control instruction of the variable-frequency water pump of the main operation pump is tracked through the spoon pipe control instruction of the standby power frequency liquid coupling pump, so that when the main operation pump fails and is stopped and is switched to the standby pump, the water supply quantity of the water supply system cannot be greatly suddenly changed, and the boiler and generator set boiler jump and machine jump faults can be avoided.

Description

Water supply pump operation switching method, device, system and storage medium

Technical Field

The disclosure relates to the technical field of generator set control, in particular to a method, a device and a system for switching operation of a water supply pump and a storage medium.

Background

With the continuous increase of the installed capacity of new energy sources of the power grid, the thermal power unit is required to have peak shaving capacity in a deeper range according to the national requirements of energy conservation and emission reduction and rapid development of renewable energy sources. The participation peak regulation low-load operation of the thermal power generating unit is correspondingly increased, the thermal power generating unit is used as a water supply pump of the largest auxiliary equipment of the power plant, and the thermal power generating unit is provided with a hydraulic coupler at low load, but has poor energy conservation and high power consumption rate, and directly influences the economic benefit index of the unit. At present, the main water feed pump is mainly used for directly adjusting the rotating speed of a water feed pump motor by adopting a frequency converter, so that the electricity consumption of the main water feed pump can be effectively reduced.

In general, the service state of the service pump is a primary service state and a standby state, and when the main service pump in operation fails due to a main body failure or a system failure, the service pump stops and must be switched to the standby pump. When the type of the standby pump is different from that of the main pump, larger water supply flow mutation easily occurs due to main-standby switching, which can cause larger fluctuation of the drum water level, thereby triggering high or low protection of the drum water level and causing furnace skip and machine skip accidents.

Disclosure of Invention

In order to overcome the technical problems in the related art, according to a first aspect of embodiments of the present disclosure, a method for switching operation of a water supply pump is provided, and the method is applied to a water supply system, where the water supply system includes a main operation pump and a standby pump, the main operation pump is a variable frequency water pump, and the standby pump is a power frequency liquid coupling pump; the method comprises the following steps:

under the condition that the standby pump input condition is true and the main operation pump is not stopped by fault, the control instruction of the standby pump tracks the variable frequency instruction of the main operation pump;

and under the condition that the main operation pump fails and stops running, the standby pump is started in an interlocking way to supply water, and the control instruction is switched into a scoop tube instruction corresponding to the variable frequency instruction.

Optionally, the main operation pump malfunction comprises: the high-voltage switch of the frequency converter is stopped by fault or the frequency converter is stopped by fault.

Optionally, the frequency converter high voltage switch malfunction shutdown includes any two of: the high-voltage switch current of the frequency converter is lower than the switch current threshold value, the high-voltage switch of the frequency converter is switched off, and the switching-on state of the high-voltage switch of the frequency converter is reversed.

Optionally, the frequency converter outage comprises any two of: the current of the frequency converter is lower than the current threshold value of the frequency converter, the frequency converter stops running, and the running state of the frequency converter is reversed.

Optionally, said interlockingly activating said backup pump water supply in the event of a failure of said primary operational pump comprises: and under the condition that the standby pump input condition is true and the main operation pump fault shutdown pulse module is triggered, interlocking to start the standby pump to supply water.

Optionally, the switching of the control instruction to the scoop tube instruction corresponding to the variable frequency instruction includes: and the instruction of the manual operator of the scoop tube executor of the standby pump is automatically tracked and set as the scoop tube instruction corresponding to the variable frequency instruction before the fault shutdown of the main operation pump.

Optionally, the scoop tube instruction corresponding to the variable frequency instruction includes: the water supply flow corresponding to the variable frequency instruction is consistent with the water supply flow corresponding to the spoon pipe instruction.

According to a second aspect of embodiments of the present disclosure, a water supply pump operation switching device is provided, and is applied to a water supply system, where the water supply system includes a main operation pump and a standby pump, where the main operation pump is a variable frequency water pump, and the standby pump is a power frequency liquid coupling pump; the device comprises:

the tracking module is used for automatically tracking the variable frequency instruction of the variable frequency water pump according to the control instruction of the power frequency liquid coupling pump under the condition that the input condition of the standby pump is true and the main operation pump is not stopped by fault;

and the switching module is used for interlocking and starting the standby pump to supply water under the condition that the main operation pump fails and stops running, and the control instruction is automatically switched into the scoop tube instruction corresponding to the variable frequency instruction.

According to a third aspect of embodiments of the present disclosure, there is provided a water supply system comprising: a main operation pump and a backup pump;

the main operation pump is a variable-frequency water pump, and the standby pump is a power frequency liquid coupling pump;

the standby pump is used for tracking the variable frequency instruction of the main operation pump by the control instruction of the standby pump under the condition that the standby pump input condition is true and the main operation pump is not stopped by fault;

and the main operation pump is used for interlocking to start the standby pump to supply water under the condition that the main operation pump fails and stops running, and the control instruction is switched into a scoop tube instruction corresponding to the variable frequency instruction.

According to a fourth aspect of embodiments of the present disclosure, there is provided a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method of any of the first aspects.

The invention provides a water supply pump operation switching method which is applied to a water supply system, wherein the water supply system comprises a main operation pump and a standby pump, the main operation pump is a variable frequency water pump, and the standby pump is a power frequency liquid coupling pump; the method comprises the following steps: under the condition that the input condition of the standby pump is true and the main operation pump is not in fault stop operation, the control instruction of the standby pump tracks the variable frequency instruction of the main operation pump; under the condition that the main operation pump fails and stops running, the standby pump is started in an interlocking mode to supply water, and the control instruction is switched to a scoop tube instruction corresponding to the variable frequency instruction. According to the embodiment of the disclosure, the frequency conversion control instruction of the variable frequency water pump of the main operation pump is tracked through the scoop tube control instruction of the standby power frequency liquid coupling pump, so that when the main operation pump fails and is switched to the standby pump, the water supply quantity of the water supply system is not greatly suddenly changed, and is basically kept stable, and the boiler and generator set boiler jump and machine jump faults can be avoided.

Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:

FIG. 1 is a schematic diagram of an implementation scenario in which various embodiments of the present disclosure are involved;

FIG. 2 is a flow chart illustrating a method of switching operation of a feed pump according to an exemplary embodiment;

FIG. 3 is a schematic diagram illustrating a boiler drum water level control according to an exemplary embodiment;

FIG. 4 is a schematic diagram illustrating a backup pump start-up logic according to an example embodiment;

FIG. 5 is a schematic diagram illustrating a feedwater pump water level control and scoop command tracking according to an example embodiment;

FIG. 6 is a block diagram illustrating a feedwater pump operation switching device, according to an example embodiment;

FIG. 7 is a block diagram illustrating a feedwater pump operation switching control apparatus according to an example embodiment.

Detailed Description

Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.

It should be noted that, all actions for acquiring signals, information or data in the present disclosure are performed under the condition of conforming to the corresponding data protection rule policy of the country of the location and obtaining the authorization given by the owner of the corresponding device.

Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While certain embodiments of the present disclosure have been shown in the accompanying drawings, it is to be understood that the present disclosure may be embodied in various forms and should not be construed as limited to the embodiments set forth herein, but are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are for illustration purposes only and are not intended to limit the scope of the present disclosure.

It should be understood that the various steps recited in the method embodiments of the present disclosure may be performed in a different order and/or performed in parallel. Furthermore, method embodiments may include additional steps and/or omit performing the illustrated steps. The scope of the present disclosure is not limited in this respect.

The term "including" and variations thereof as used herein are intended to be open-ended, i.e., including, but not limited to. The term "based on" is based at least in part on. The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments. Related definitions of other terms will be given in the description below.

It should be noted that the terms "first," "second," and the like in this disclosure are merely used to distinguish between different devices, modules, or units and are not used to define an order or interdependence of functions performed by the devices, modules, or units.

It should be noted that references to "one", "a plurality" and "a plurality" in this disclosure are intended to be illustrative rather than limiting, and those of ordinary skill in the art will appreciate that "one or more" is intended to be understood as "one or more" unless the context clearly indicates otherwise.

The present disclosure is described below in connection with specific embodiments.

First, describing application scenarios of the present disclosure, fig. 1 is a schematic diagram of an implementation scenario according to various embodiments of the present disclosure, where the implementation scenario may include: the main operation pump is connected with the 6KV bus A through the frequency converter and the frequency converter high-voltage switch, and is connected with the standby pump of the 6KV bus B through the standby pump high-voltage switch, wherein the main operation pump is a frequency conversion water pump, and the standby pump is a power frequency liquid coupling pump. In order to improve the operational reliability of a water supply system, on the basis of realizing the protection and interlocking control functions of system equipment, the method solves the switching problem of the operation modes of the main water supply pump and the standby water supply pump during the operation of a unit, not only realizes the undisturbed switching of the main operation pump variable frequency water supply pump fault tripping automatic switching to the standby power frequency liquid coupling pump so as to meet the automatic control requirement of the boiler water level, but also realizes the automatic and rapid switching to the standby power frequency liquid coupling pump after the main operation water supply pump fault tripping through the optimal design of the water supply automatic control logic according to the configuration condition of the water supply pump, combines with the control logic of a water supply pump DCS (Distributed Control System, a distributed control system) system, obtains the relation between a main operation pump variable frequency instruction and the rotating speed and the flow and the relation between the standby power frequency liquid coupling water supply pump spoon pipe instruction and the rotating speed and the flow through the acquisition and analysis of relevant operation history data of the rotating speed characteristic test and the two water supply pumps, and simultaneously ensures that the water supply pump variable frequency instruction and the standby power frequency liquid coupling water supply pump spoon pipe instruction of the main operation pump is not disturbed, thereby achieving the safe operation of the power generating unit without abrupt change after the switching. The main operation pump and the standby pump can form a water supply system, wherein the main operation pump is a variable frequency water pump, the standby pump is a power frequency liquid coupling pump, and the standby pump is used for tracking the variable frequency instruction of the main operation pump under the condition that the input condition of the standby pump is true and the main operation pump is not in fault stop operation; and the main operation pump is used for interlocking to start the standby pump to supply water under the condition that the main operation pump fails and stops running, and the control instruction is switched to the scoop tube instruction corresponding to the variable frequency instruction.

FIG. 2 is a flow chart illustrating a method of switching operation of a feed pump according to an exemplary embodiment, as shown in FIG. 2, the method of switching operation of a feed pump according to an embodiment of the present disclosure may include the following steps:

in step S210, in the case where the standby pump input condition is true and the main operation pump is not out of order, the control instruction of the standby pump tracks the variable frequency instruction of the main operation pump.

In the step, under the condition that the standby pump is put into standby in the variable frequency operation mode of the main operation pump of the unit, in order to ensure that the corresponding rotating speed of the position of the scoop tube of the standby pump corresponds to the variable frequency rotating speed of the main operation pump, the scoop tube command of the standby power frequency liquid coupling pump automatically tracks the variable frequency rotating speed control command of the main operation pump.

Because the main operation pump and the standby pump are in two different rotation speed regulation modes of frequency conversion and liquid coupling, the frequency conversion rotation speed instruction characteristic of the main operation pump and the rotation speed instruction characteristic of the standby power frequency liquid coupling pump have larger linear difference in actual operation, so that the control instruction of the standby power frequency liquid coupling pump scoop tube cannot directly adopt the control instruction of the frequency converter, and the corresponding function correction function of the frequency conversion instruction-scoop tube instruction is required to be added to the liquid coupling rotation speed control instruction of the standby pump in the automatic water supply control logic. And respectively analyzing the corresponding relation between the rotating speed, the flow and the control instruction of the main operating pump and the standby pump through the test and the collected historical operating data to obtain a corresponding tracking function f (x) of the variable frequency instruction of the main operating pump and the scoop tube instruction of the standby pump, as shown in the table 1:

TABLE 1 corresponding tracking function relationship Table for Main running Pump variable frequency instruction and Standby Pump spoon tube instruction

Wherein x is a control value of a variable frequency instruction, y is a control value of a spoon pipe instruction corresponding to x, and the variable frequency instruction x is consistent with the corresponding spoon pipe instruction y respectively corresponding to the variable frequency instruction x.

In step S220, under the condition that the main operation pump fails and stops running, the standby pump is started in an interlocking manner, and the control instruction is switched to a scoop tube instruction corresponding to the variable frequency instruction.

In the step, when the main operation pump frequency converter fails or the main operation pump frequency converter high-voltage switch trips, the standby pump high-voltage switch is started in an interlocking way, and the control instruction of the water supply system is automatically loaded to the scoop tube instruction corresponding to the frequency conversion instruction before the main operation pump stops running through tracking control.

In summary, the present disclosure provides a method for switching operation of a water supply pump, which is applied to a water supply system, where the water supply system includes a main operation pump and a standby pump, the main operation pump is a variable frequency water pump, and the standby pump is a power frequency liquid coupling pump; the method comprises the following steps: under the condition that the input condition of the standby pump is true and the main operation pump is not in fault stop operation, the control instruction of the standby pump tracks the variable frequency instruction of the main operation pump; under the condition that the main operation pump fails and stops running, the standby pump is started in an interlocking mode to supply water, and the control instruction is switched to a scoop tube instruction corresponding to the variable frequency instruction. According to the embodiment of the disclosure, the frequency conversion control instruction of the variable frequency water pump of the main operation pump is tracked through the scoop tube control instruction of the standby power frequency liquid coupling pump, so that when the main operation pump fails and is switched to the standby pump, the water supply quantity of the water supply system is not greatly suddenly changed, and is basically kept stable, and the boiler and generator set boiler jump and machine jump faults can be avoided.

FIG. 3 is a schematic diagram of a boiler drum level control according to an exemplary embodiment, as shown in FIG. 3, the main operation pump frequency converter level control scheme adopts drum level three-impulse control, uses the drum level fed back by the transmitter as a main adjustment signal, uses the steam flow of the drum as a feedforward signal, eliminates the adverse effect of false water level, and simultaneously introduces a water supply flow signal of the frequency converter as an internal disturbance signal through the transmitter, overcomes disturbance caused by water supply flow, and rapidly reflects the change condition of water supply flow at the water supply side. The frequency converter control instruction x is adjusted through the feedback control of a two-stage PID (Proportion Integration Differentiation, proportional-integral-derivative controller) (PID 1 and PID 2), so that the water supply flow corresponding to the frequency converter control instruction x can keep the drum water level stable at the water level set value. The water level control logic is implemented in the DCS system.

The variable frequency instruction of the main operating pump is designed to be linearly changed from 0-50Hz to 0-100%, so that the operating personnel can adapt to the percentage adjustment instruction of the standby power frequency liquid coupling pump spoon pipe. The main operation pump variable frequency rotating speed control mode is divided into manual control and automatic control, the manual/automatic switching can be carried out through the manual operator, in the automatic control mode, the three-impulse automatic control logic PID parameters of the main operation pump drum water level are reset and debugged, the analog disturbance test is carried out, and the main operation pump variable frequency control water level is ensured to meet the automatic regulation under the normal working condition.

Because the frequency is limited by the lowest operating frequency of the main operating pump frequency converter, after the starting instruction of the main operating pump frequency converter is triggered, the automatic control instruction of the main operating pump frequency converter is set to be 15% of the lowest control instruction, the manual output lower limit of a manual operator (not shown in the figure) of the main operating pump frequency converter is set to be 20%, and when the instruction output of the main operating pump frequency converter is less than 20% in the manual control mode, the control logic automatically locks the frequency converter for adjustment and triggers the low-limit alarm.

In summary, the embodiment of the disclosure controls the main operation pump frequency converter instruction by adopting the three-impulse control scheme of the drum water level, ensures the stability of the drum water level of the boiler, and avoids non-stop events of the unit and the boiler caused by unstable drum water level.

In order to prevent the misjudgment of the shutdown of the main operation pump and the loss caused by the shutdown of the main operation pump, the interlocking start control logic of the standby pump is perfected, the operation states of the two devices, namely the frequency converter of the main operation pump and the high-voltage switch of the frequency converter, are monitored simultaneously, namely any one device is judged to be in shutdown or trip, in order to improve the reliability of the switching protection logic, the operation states of the frequency converter and the high-voltage switch of the frequency converter are judged by adopting triple redundant 'three-out-of-two' logic, namely the current of the high-voltage switch of the frequency converter is lower than a switch current threshold value, any two of the three conditions of switching on and switching off of the high-voltage switch of the frequency converter are true, and the fault shutdown of the high-voltage switch of the frequency converter is judged; and if any two of the three conditions that the current of the frequency converter is lower than the current threshold value of the frequency converter, the frequency converter stops running and the running state of the frequency converter is reversed are true, judging that the frequency converter fails to stop running. And if the failure stop of the high-voltage switch of the frequency converter is true or the failure stop of the frequency converter is true, judging that the main operation pump is stopped. For example, referring to fig. 4, fig. 4 is a schematic diagram illustrating a standby pump start logic according to an exemplary embodiment, as shown in fig. 4, a high-voltage switch of a frequency converter is connected to an input terminal 1 of a two-out-of-three logic S5 through a low-limit monitor S1, a high-voltage switch of the frequency converter is disconnected to an input terminal 2 of the two-out-of-three logic S5, and a high-voltage switch of the frequency converter is connected to an input terminal 3 of the two-out-of-three logic S5 through a not gate S2; for example, the low limit value of the low limit monitor S1 may be set to 10% of the rated current of the high voltage switch of the frequency converter, wherein the logic of the low limit monitor S1 is that the input is smaller than the set low limit value, the output is true, and otherwise the output is false. The logic of the two-out-of-three logic S5 is true as long as any two of the three inputs are true.

The current of the frequency converter is connected with the input end 1 of the three-out-of-two logic S6 through the low-limit monitor S3, the frequency converter is stopped to be connected with the input end 2 of the three-out-of-two logic S6, and the frequency converter is operated to be connected with the input end 3 of the three-out-of-two logic S6 through the NOT gate S4; for example, the low limit value of the low limit monitor S3 may be set to 10% of the rated current of the frequency converter, wherein the logic of the low limit monitor S3 is that the input is smaller than the set low limit value, the output is true, and otherwise the output is false. The logic of the two-out-of-three logic S6 is true as long as any two of the three inputs are true.

The outputs of the two-out-of-three logics S5 and S6 are respectively connected with two input ends of the OR gate S7, and if the output end of the OR gate S7 is true, the main operation pump is stopped.

The output of the OR gate S7 is connected with the input end of the main operation pump fault shutdown pulse module S8, the OR gate S7 triggers the main operation pump fault shutdown pulse module S8 when the output of the OR gate S7 is true, a high pulse signal (logic 1) with the duration of 2S is output, the output end of the main operation pump fault shutdown pulse module S8 and the standby pump input condition S9 are respectively connected with the two input ends of the AND gate S10, the output end of the AND gate S10 is a standby pump interlocking start control command, and the AND gate S10 is interlocked to start the standby pump when the output of the AND gate S10 is true. I.e. the interlock starts the backup pump water supply in case the backup pump input condition is true and the main operating pump failure shut down pulse module is triggered. The control logic is completed by the DCS system.

In summary, according to the embodiment of the disclosure, by adopting triple redundant 'three-out-of-two' logic for determining the operation states of the frequency converter and the high-voltage switch of the frequency converter, taking or determining is performed, the main operation pump is prevented from being stopped due to misjudgment to the greatest extent, and the reliability of the main and standby pump switching protection logic is improved.

FIG. 5 is a schematic diagram illustrating water level control and scoop tube command tracking of a feed pump according to an exemplary embodiment, as shown in FIG. 5, the backup pump still employs three-impulse control of the drum level, uses the drum level fed back by the transmitter as a main adjustment signal, uses the steam flow of the drum as a feedforward signal, eliminates the adverse effect of "false water level", and simultaneously introduces a feed water flow signal of the frequency converter as an internal disturbance signal through the transmitter, overcomes disturbance caused by the feed water flow, and rapidly reflects the change condition of the feed water flow at the feed water side. And the scoop tube control command y is regulated through two-stage PID (PID 3 and PID 4) feedback control, so that the water supply flow corresponding to the scoop tube control command y can keep the drum water level stable at the water level set value. Wherein, the dotted line frame part is a spare pump spoon pipe control command tracking frequency converter control command and a main and spare pump switching logic, T1 is a condition selector, and T2 is a manual operator. When the standby pump input condition is true and the main operation pump is not stopped, the AND gate output is true, and the condition selector T1 input condition is true, the standby pump scoop tube control command y tracks the main operation pump variable frequency command x; when the main operation pump is stopped, the output of the AND gate is false, the input condition of the condition selector T1 is false, and the condition selector T1 outputs the function value y of the tracking function f (x) to the manual operator T2, namely, the instruction of the manual operator of the spoon pipe executor of the standby pump automatically tracks and sets the spoon pipe instruction y corresponding to the variable frequency instruction x before the fault stopping of the main operation pump. According to the definition of the tracking function f (x), the water supply flow corresponding to the spoon pipe instruction y is consistent with the water supply flow corresponding to the variable frequency instruction x before the main operation pump fails and stops operation, so that the water supply flow before and after the main operation pump is switched can be ensured not to have large abrupt change, and non-stop accidents such as furnace jump, machine jump and the like are avoided.

FIG. 6 is a block diagram of a feedwater pump operation switching device according to an exemplary embodiment, as shown in FIG. 6, the feedwater pump operation switching device 600 is applied to a feedwater system including a main operation pump and a backup pump, wherein the main operation pump is a variable frequency water pump, and the backup pump is a power frequency fluid coupling pump; the device comprises:

the tracking module 610 is configured to automatically track a variable frequency instruction of the variable frequency water pump according to a control instruction of the power frequency liquid coupled pump when the standby pump input condition is true and the main operation pump is not in fault and is not out of operation;

and the switching module 620 is used for interlocking and starting the standby pump to supply water under the condition that the main operation pump fails and stops running, and the control instruction is automatically switched into the scoop tube instruction corresponding to the variable frequency instruction.

Optionally, the tracking module 610 includes:

a fault tracking sub-module for tracking a fault outage of the main operating pump, the fault outage of the main operating pump comprising: the high-voltage switch of the frequency converter is stopped by fault or the frequency converter is stopped by fault.

Optionally, the fault tracking sub-module is further configured to track a frequency converter high voltage switch fault outage, where the frequency converter high voltage switch fault outage includes any two of: the high-voltage switch current of the frequency converter is lower than the switch current threshold value, the high-voltage switch of the frequency converter is switched off, and the switching-on state of the high-voltage switch of the frequency converter is reversed.

Optionally, the fault tracking sub-module is further configured to track a frequency converter fault outage, the frequency converter fault outage including any two of: the current of the frequency converter is lower than the current threshold value of the frequency converter, the frequency converter stops running, and the running state of the frequency converter is reversed.

Optionally, the switching module 620 includes:

a fail-over sub-module for interlocking the backup pump water supply in the event of a failure outage of the primary operational pump, the interlocking the backup pump water supply in the event of a failure outage of the primary operational pump comprising: and under the condition that the standby pump input condition is true and the main operation pump fault shutdown pulse module is triggered, interlocking to start the standby pump to supply water.

Optionally, the fault switching sub-module is further configured to switch a control instruction to a scoop tube instruction corresponding to the variable frequency instruction, where the switching of the control instruction to the scoop tube instruction corresponding to the variable frequency instruction includes: and the instruction of the manual operator of the scoop tube executor of the standby pump is automatically tracked and set as the scoop tube instruction corresponding to the variable frequency instruction before the fault shutdown of the main operation pump.

Optionally, the tracking module 610 is further configured to track a scoop tube instruction corresponding to the variable frequency instruction, where a feedwater flow corresponding to the variable frequency instruction is consistent with a feedwater flow corresponding to the scoop tube instruction.

In summary, the embodiment of the present disclosure provides a water supply pump operation switching device 600, which is applied to a water supply system, where the water supply system includes a main operation pump and a standby pump, the main operation pump is a variable frequency water pump, and the standby pump is a power frequency liquid coupling pump; the device comprises: the tracking module 610 is configured to automatically track a variable frequency instruction of the variable frequency water pump according to a control instruction of the power frequency liquid coupled pump when the standby pump input condition is true and the main operation pump is not in fault and is not out of operation; and the switching module 620 is used for interlocking and starting the standby pump to supply water under the condition that the main operation pump fails and stops running, and the control instruction is automatically switched into the scoop tube instruction corresponding to the variable frequency instruction. According to the embodiment of the disclosure, the frequency conversion control instruction of the variable frequency water pump of the main operation pump is tracked through the scoop tube control instruction of the standby power frequency liquid coupling pump, so that when the main operation pump fails and is switched to the standby pump, the water supply quantity of the water supply system is not greatly suddenly changed, and is basically kept stable, and the boiler and generator set boiler jump and machine jump faults can be avoided.

The specific manner in which the various modules perform the operations in the apparatus of the above embodiments have been described in detail in connection with the embodiments of the method, and will not be described in detail herein.

FIG. 7 is a block diagram illustrating a feedwater pump operation switching control apparatus according to an example embodiment. The electronic device 700 may be a DCS system, as shown in fig. 7, the electronic device 700 may include: a processor 701, a memory 702. The electronic device 700 may also include one or more of a multimedia component 703, an input/output (I/O) interface 704, and a communication component 705.

The processor 701 is configured to control the overall operation of the electronic device 700 to perform all or part of the above-mentioned steps of the method for switching operation of the feed pump. The memory 702 is used to store various types of data to support operation on the electronic device 700, which may include, for example, instructions for any application or method operating on the electronic device 700, as well as application-related data, such as contact data, messages sent and received, pictures, audio, video, and so forth. The Memory 702 may be implemented by any type or combination of volatile or non-volatile Memory devices, such as static random access Memory (Static Random Access Memory, SRAM for short), electrically erasable programmable Read-Only Memory (Electrically Erasable Programmable Read-Only Memory, EEPROM for short), erasable programmable Read-Only Memory (Erasable Programmable Read-Only Memory, EPROM for short), programmable Read-Only Memory (Programmable Read-Only Memory, PROM for short), read-Only Memory (ROM for short), magnetic Memory, flash Memory, magnetic disk, or optical disk. The multimedia component 703 can include a screen and an audio component. Wherein the screen may be, for example, a touch screen, the audio component being for outputting and/or inputting audio signals. For example, the audio component may include a microphone for receiving external audio signals. The received audio signals may be further stored in the memory 702 or transmitted through the communication component 705. The audio assembly further comprises at least one speaker for outputting audio signals. The I/O interface 704 provides an interface between the processor 701 and other interface modules, which may be a keyboard, mouse, buttons, etc. These buttons may be virtual buttons or physical buttons. The communication component 705 is for wired or wireless communication between the electronic device 700 and other devices. Wireless communication, such as Wi-Fi, bluetooth, near field communication (Near Field Communication, NFC for short), 2G, 3G, 4G, NB-IOT, eMTC, or other 5G, etc., or one or a combination of more of them, is not limited herein. The corresponding communication component 705 may thus comprise: wi-Fi module, bluetooth module, NFC module, etc.

In an exemplary embodiment, the electronic device 700 may be implemented by one or more application specific integrated circuits (Application Specific Integrated Circuit, abbreviated ASIC), digital signal processor (Digital Signal Processor, abbreviated DSP), digital signal processing device (DigitalSignal Processing Device, abbreviated DSPD), programmable logic device (Programmable Logic Device, abbreviated PLD), field programmable gate array (Field Programmable Gate Array, abbreviated FPGA), controller, microcontroller, microprocessor, or other electronic components for performing the above-described method of switching operation of a feed pump.

In another exemplary embodiment, a computer readable storage medium is also provided that includes program instructions that when executed by a processor implement the steps of the above-described feedwater pump operation switching method. For example, the computer readable storage medium may be the memory 702 including program instructions described above that are executable by the processor 701 of the electronic device 700 to perform the method of switching operation of the feed pump described above.

The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.

In addition, the specific features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, the present disclosure does not further describe various possible combinations.

Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.

Claims (10)

1. The water supply pump operation switching method is characterized by being applied to a water supply system, wherein the water supply system comprises a main operation pump and a standby pump, the main operation pump is a variable frequency water pump, and the standby pump is a power frequency liquid coupling pump; the method comprises the following steps:

under the condition that the standby pump input condition is true and the main operation pump is not stopped by fault, the control instruction of the standby pump tracks the variable frequency instruction of the main operation pump;

and under the condition that the main operation pump fails and stops running, the standby pump is started in an interlocking way to supply water, and the control instruction is switched into a scoop tube instruction corresponding to the variable frequency instruction.

2. The method of claim 1, wherein the primary operation pump failure shutdown comprises: the high-voltage switch of the frequency converter is stopped by fault or the frequency converter is stopped by fault.

3. The method of claim 2, wherein the inverter high voltage switch failure outage comprises any two of: the high-voltage switch current of the frequency converter is lower than the switch current threshold value, the high-voltage switch of the frequency converter is switched off, and the switching-on state of the high-voltage switch of the frequency converter is reversed.

4. The method of claim 2, wherein the converter outage comprises any two of: the current of the frequency converter is lower than the current threshold value of the frequency converter, the frequency converter stops running, and the running state of the frequency converter is reversed.

5. The method of claim 1, wherein said interlockingly enabling said backup pump water supply in the event of a failure of said main operating pump comprises: and under the condition that the standby pump input condition is true and the main operation pump fault shutdown pulse module is triggered, interlocking to start the standby pump to supply water.

6. The method of claim 1, wherein the switching of the control instruction to the scoop tube instruction corresponding to the variable frequency instruction comprises: and the instruction of the manual operator of the scoop tube executor of the standby pump is automatically tracked and set as the scoop tube instruction corresponding to the variable frequency instruction before the fault shutdown of the main operation pump.

7. The method of claim 1, wherein the scoop tube instruction corresponding to the variable frequency instruction comprises: the water supply flow corresponding to the variable frequency instruction is consistent with the water supply flow corresponding to the spoon pipe instruction.

8. The water supply pump operation switching device is characterized by being applied to a water supply system, wherein the water supply system comprises a main operation pump and a standby pump, the main operation pump is a variable frequency water pump, and the standby pump is a power frequency liquid coupling pump; the device comprises:

the tracking module is used for automatically tracking the variable frequency instruction of the variable frequency water pump according to the control instruction of the power frequency liquid coupling pump under the condition that the input condition of the standby pump is true and the main operation pump is not stopped by fault;

and the switching module is used for interlocking and starting the standby pump to supply water under the condition that the main operation pump fails and stops running, and the control instruction is automatically switched into the scoop tube instruction corresponding to the variable frequency instruction.

9. A water supply system, comprising: a main operation pump and a backup pump;

the main operation pump is a variable-frequency water pump, and the standby pump is a power frequency liquid coupling pump;

the standby pump is used for tracking the variable frequency instruction of the main operation pump by the control instruction of the standby pump under the condition that the standby pump input condition is true and the main operation pump is not stopped by fault;

and the main operation pump is used for interlocking to start the standby pump to supply water under the condition that the main operation pump fails and stops running, and the control instruction is switched into a scoop tube instruction corresponding to the variable frequency instruction.

10. A non-transitory computer readable storage medium having stored thereon a computer program, characterized in that the program when executed by a processor realizes the steps of the method according to any of claims 1-7.

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