CN114109858B - Balanced control method and system for rotational speed of boiler feed pump cluster - Google Patents
Balanced control method and system for rotational speed of boiler feed pump cluster Download PDFInfo
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- CN114109858B CN114109858B CN202111121890.8A CN202111121890A CN114109858B CN 114109858 B CN114109858 B CN 114109858B CN 202111121890 A CN202111121890 A CN 202111121890A CN 114109858 B CN114109858 B CN 114109858B
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0066—Control, e.g. regulation, of pumps, pumping installations or systems by changing the speed, e.g. of the driving engine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/12—Combinations of two or more pumps
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Abstract
The embodiment of the application provides a method and a system for controlling the rotation speed balance of a boiler feed pump cluster, wherein the rotation speed balance control aim of a feed system is that the maximum rotation speed difference of each running feed pump is not more than a preset threshold value, when the rotation speed of the feed pump is higher than the preset threshold value, the rotation speed of the maximum rotation speed feed pump is reduced, and the rotation speed of the minimum rotation speed feed pump is increased, so that the rotation speed difference between the maximum rotation speed feed pump and the minimum rotation speed feed pump is not more than the preset threshold value; in the process of calculating the comprehensive information coding minimum value of the water supply pump, the data processing speed of the microprocessor is greatly improved, the time proportion occupied by the numerical comparison operation in the whole control period is extremely small, the operation speed of the whole control logic cannot be influenced even if more data are compared, and the actual influence on a process control program is avoided. The cluster control of the water feed pumps can be realized, each water feed pump operates in a healthy state, the water feed of the boiler is ensured to be sufficient, and meanwhile, the rapid maneuverability requirement of a power system is met.
Description
Technical Field
The embodiment of the application relates to the technical field of boiler thermodynamic systems, in particular to a method and a system for controlling the rotation speed balance of a boiler feed pump cluster.
Background
In order to obtain performance indexes which cannot be achieved by the traditional single-actuator system, such as quick response time, higher control precision and the like, the multi-actuator system is widely applied to a modern control system, such as adopting a plurality of water supply pumps to supply water to the evaporator, so that the water level of the evaporator is ensured to be kept in a reasonable range. In addition, the adoption of multiple execution mechanisms can provide necessary redundancy for the system and improve the reliability of the control system. The water feed pump control technology is mature, such as intelligent rotation speed adjustment and operation data networking of the water feed pump. The traditional water supply pump set joint control technology usually adopts a sequential mode to control the operation and stop of the water supply pump, or carries out the combination of the load capacity and the size load capacity according to the load capacity to regulate the rotating speed. At present, along with various problems of control precision and engineering application limitation, a large number of cluster water supply pumps are often adopted for boiler water supply, start-stop distribution is required according to single-machine running time in order to ensure service life uniformity of each water supply pump, and meanwhile, the rotating speed difference of a plurality of water supply pump sets is required to be controlled in a smaller range.
In marine boilers, the load of the boiler changes greatly and rapidly, and a constant pressure difference water supply control method is often adopted to ensure that the water supply of the boiler is stable in a reasonable range. In order to ensure reliable operation of the power system, the boiler feed pump adopts a plurality of feed pumps, wherein the feed pumps at least comprise one standby pump. The start-stop control and the rotating speed control of the water supply pumps directly influence the safe and reliable operation of the boiler, and the dangerous situations of dry boiler, full water and the like are avoided. The common multi-feed pump start-stop control and the rotation speed balancing control adopt an enumeration method, all feed pump combinations are enumerated, the start-stop of the feed pumps is controlled, and the rotation speed balancing of the running pumps is controlled. When the number of the water feed pumps is large, the complexity of the water feed pump start-stop logic and the rotation speed balance control logic is multiplied, and the listed water feed pump combinations can be lost, so that the control potential safety hazard is increased.
In order to ensure safe and reliable operation of the boiler, 2 water feed pumps are operated in the boiler water feed system at least, and a standby water feed pump is required to be switched at any time. Once the running water supply pump gives an alarm, the safety failure of the pump set can be caused, and the running of the pump needs to be stopped; the newly started water feed pump has no potential safety hazard, and the running water feed pump is ensured to run without diseases. Meanwhile, the operation of the water supply pump also needs to consider the system state of the steam-water circulation of the whole boiler, and a series of parameter states such as the water pressure and the temperature of the outlet of the water supply pump, so that the abnormal damage of the boiler system to the health state of the water supply pump unit is prevented.
And the water supply pumps are controlled in a cluster mode, and each water supply pump operates in a healthy state, so that the water supply of the boiler is ensured to be sufficient, and meanwhile, the requirement of the power system on quick maneuverability is met.
Disclosure of Invention
The embodiment of the application provides a method and a system for controlling the rotation speed balance of a boiler feed pump cluster, which can realize the control of the feed pump cluster, ensure that the feed water of a boiler is sufficient when each feed pump runs in a healthy state, and simultaneously meet the requirement of quick maneuverability of a power system.
In a first aspect, an embodiment of the present application provides a method for controlling rotation speed balance of a boiler feed pump cluster, including:
step S1, determining two water feed pumps with the largest rotation speed difference in the water feed pumps running at the current moment in a water feed system, and combining the two water feed pumps as water feed pumps to be regulated;
step S2, if the rotation speed difference is judged to be larger than a preset threshold value, the rotation speed of the water feed pump with the largest rotation speed in the water feed pump combination to be regulated is increased based on a preset regulation parameter, and the rotation speed of the water feed pump with the smallest rotation speed in the water feed pump combination to be regulated is reduced; returning to step S1.
Preferably, before the step S1, the method further includes:
the method comprises the steps of digitally numbering a water supply pump, digitally processing the state of a check valve of the water supply pump, setting a corresponding value of 1 if the water supply pump is running, and setting a corresponding value of 0 if the water supply pump stops running;
and carrying out multidimensional data combination on the running state, the check valve state, the rotating speed and the water supply pump number of the water supply pump to form a digital code corresponding to the water supply pump.
Preferably, the step S1 specifically includes:
determining the rotation speeds of all water feed pumps running at the current moment in a water feed system, and determining the water feed pump with the maximum rotation speed and the minimum rotation speed;
and determining the water feed pump combination with the maximum rotating speed and the minimum rotating speed as the water feed pump combination to be regulated.
Preferably, the step S1 specifically includes:
determining the number and the rotating speed of all the water supply pumps running at the current moment based on the running state values in the digital codes of all the water supply pumps in the water supply system;
and determining the water feed pump with the maximum rotating speed and the minimum rotating speed based on the numbers and the rotating speeds of all the water feed pumps running at the current moment.
Preferably, in the step S2, if it is determined that the rotation speed difference is not greater than a preset threshold, the rotation speed of the water pump in the water pump combination to be adjusted is not adjusted.
In a second aspect, an embodiment of the present application provides a system for controlling cluster rotational speed balance of a boiler feed pump, further including:
the rotating speed determining module is used for determining two water feed pumps with the largest rotating speed difference in the water feed pumps running at the current moment in the water feed system and taking the two water feed pumps as a water feed pump combination to be adjusted;
the rotation speed balancing module is used for increasing the rotation speed of the water feed pump with the maximum rotation speed in the water feed pump combination to be regulated based on preset regulation parameters and reducing the rotation speed of the water feed pump with the maximum rotation speed in the water feed pump combination to be regulated if the rotation speed difference is judged to be larger than the preset threshold; returning to step S1.
Preferably, the device further comprises a coding module, wherein the coding module is used for digitally numbering the water supply pump, digitally processing the check valve state of the water supply pump, and combining the operation state, the rotating speed and the water supply pump number of the water supply pump with multidimensional data so as to form a digital code corresponding to the water supply pump: when the maximum rotation speed is obtained, the water supply pump corresponds to an operation state position 1 if the water supply pump is in operation, and corresponds to an operation state position 0 if the water supply pump stops operation; when the minimum rotation speed is obtained, if the running state bit of the water supply pump is detected to be 0, all the positions corresponding to the digital codes of the water supply pump are set to be 1.
The rotating speed determining module is specifically used for determining the numbers and the rotating speeds of all the water feeding pumps running at the current moment based on the running state values in the digital codes of all the water feeding pumps in the water feeding system.
And determining the water feed pump with the maximum rotating speed and the minimum rotating speed based on the numbers and the rotating speeds of all the water feed pumps running at the current moment.
Preferably, the rotation speed determining module is specifically configured to determine rotation speeds of all the water feed pumps running at the current moment in the water feed system, and determine the water feed pump with the maximum rotation speed and the minimum rotation speed;
and determining the water feed pump combination with the maximum rotating speed and the minimum rotating speed as the water feed pump combination to be regulated.
In a third aspect, an embodiment of the present application provides an electronic device, including a memory, a processor, and a computer program stored in the memory and capable of running on the processor, where the processor implements the steps of the method for controlling cluster rotational speed balance of a boiler feedwater pump according to the embodiment of the first aspect of the present application when the processor executes the program.
In a fourth aspect, an embodiment of the present application provides a non-transitory computer readable storage medium, on which a computer program is stored, which when executed by a processor, implements the steps of a method for controlling cluster rotational speed balance of a boiler feedwater pump according to the embodiment of the first aspect of the present application.
According to the method and the system for controlling the rotation speed balance of the boiler feed pump cluster, provided by the embodiment of the application, the rotation speed balance control target of a feed water system is that the maximum rotation speed difference of each running feed water pump is not greater than a preset threshold, when the rotation speed of the feed water pump is higher than the preset threshold, the rotation speed of the maximum rotation speed feed water pump is reduced, and the rotation speed of the minimum rotation speed feed water pump is increased, so that the rotation speed difference between the maximum rotation speed feed water pump and the minimum rotation speed feed water pump is not greater than the preset threshold; in the process of calculating the water supply pump comprehensive information coding minimum value, the data processing speed of the microprocessor is greatly improved, the time proportion occupied by the numerical comparison operation in the whole control period is extremely small, the whole control logic operation speed cannot be influenced even if more data are compared, and the actual influence on a process control program is avoided. The cluster control of the water feed pumps can be realized, each water feed pump operates in a healthy state, the water feed of the boiler is ensured to be sufficient, and meanwhile, the rapid maneuverability requirement of a power system is met. The potential safety hazard brought to the control system by program multi-layer nesting is avoided; the program has strong expansibility, strong portability, little code quantity and simple style. After the comprehensive information of each pump is encoded, only the operation of obtaining the maximum value or the minimum value of each encoding is needed to find the water supply pump with the speed regulation.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for controlling cluster rotational speed balance of a boiler feed pump according to an embodiment of the application;
fig. 2 is a schematic diagram of a physical structure according to an embodiment of the application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In the embodiment of the present application, the term "and/or" is merely an association relationship describing the association object, which indicates that three relationships may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone.
The terms "first", "second" in embodiments of the application are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the application, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion. For example, a system, article, or apparatus that comprises a list of elements is not limited to only those elements or units listed but may alternatively include other elements not listed or inherent to such article, or apparatus. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
Because the model of the selected water feed pump is the same, the performance parameters of the water feed pumps are consistent, and meanwhile, the installation modes of the water feed pumps are consistent, and the installation positions are all on the same horizontal plane, the rotation speed of each running water feed pump is required to be the same rotation speed based on the optimization consideration of factors such as safety, service life and the like. Due to the installation errors and the non-absolute consistency of the performance parameters of the water supply pumps, in the actual operation process of the boiler water supply system, even if the rotation speed set values of the water supply pumps are consistent, the actual operation rotation speeds deviate to some extent, so that the rotation speed difference between the water supply pumps is overlarge, and the performance state difference of the water supply pumps is larger.
Therefore, the embodiment of the application provides a method and a system for controlling the rotation speed balance of a boiler feed pump cluster, which can realize the control of the feed pump cluster, ensure that the feed water of a boiler is sufficient when each feed pump runs in a healthy state, and simultaneously meet the requirement of quick maneuverability of a power system. The following description and description will be made with reference to various embodiments.
Fig. 1 is a schematic diagram of a method for controlling rotation speed balance of a boiler feed pump cluster according to an embodiment of the present application, including:
step S1, determining two water feed pumps with the largest rotation speed difference in the water feed pumps running at the current moment in a water feed system, and combining the two water feed pumps as water feed pumps to be regulated;
step S2, if the rotation speed difference is judged to be larger than a preset threshold value, the rotation speed of the water feed pump with the largest rotation speed in the water feed pump combination to be regulated is increased based on a preset regulation parameter, and the rotation speed of the water feed pump with the smallest rotation speed in the water feed pump combination to be regulated is reduced; returning to step S1.
The rotational speed balance control objective of the water supply system is that the maximum rotational speed difference of each running water supply pump is smaller than a threshold value alpha, when the rotational speed of the water supply pump is higher than the threshold value alpha, the rotational speed of the water supply pump with the maximum rotational speed should be reduced, and the rotational speed of the water supply pump with the minimum rotational speed should be increased, so that the rotational speed difference between the water supply pump with the maximum rotational speed and the water supply pump with the minimum rotational speed is smaller than alpha.
On the basis of the foregoing embodiment, as a preferred implementation manner, before the step S1, the method further includes:
the method comprises the steps of digitally numbering a water supply pump, digitally processing the state of a check valve of the water supply pump, setting a corresponding value of 1 if the water supply pump is running, and setting a corresponding value of 0 if the water supply pump stops running;
and carrying out multidimensional data combination on the running state, the check valve state, the rotating speed and the water supply pump number of the water supply pump to form a digital code corresponding to the water supply pump.
When the number of the water feeding pump with the maximum rotation speed in the running process is obtained, data fusion is carried out on the data of the running state, the rotation speed, the pump number and the like (in the embodiment, only 3 items are listed as examples) of the water feeding pump to form the following coding information:
the method comprises the steps of performing digital processing on the state of a check valve of a water supply pump, and performing multidimensional data combination on the running state, the rotating speed and the water supply pump number of the water supply pump to form digital codes corresponding to the water supply pump: when the maximum rotation speed is obtained, the water supply pump corresponds to an operation state position 1 if the water supply pump is in operation, and corresponds to an operation state position 0 if the water supply pump stops operation; when the minimum rotation speed is obtained, if the running state bit of the water supply pump is detected to be 0, all the positions corresponding to the digital codes of the water supply pump are set to be 1.
On the basis of the foregoing embodiment, as a preferred implementation manner, there is provided an enumeration method rotation speed balancing solving method, where the step S1 specifically includes:
determining the rotation speeds of all water feed pumps running at the current moment in a water feed system, and determining the water feed pump with the maximum rotation speed and the minimum rotation speed;
and determining the water feed pump combination with the maximum rotating speed and the minimum rotating speed as the water feed pump combination to be regulated.
In the prior art, when the running number of the water supply pumps is m, the running pump combination is as follows:
X m1 (q 1 ,q 2 ,…,q m )；
X m2 (q 2 ,q 3 ,…,q m+1 )；
……
when m water pumps are running, the water pumps need to be configuredAnd comparing and combining the serial numbers of the water supply pumps with the maximum rotation speed and the minimum rotation speed.
Therefore, the total combined number when the running number of the water supply pumps is 2-N-1
When the total number of the water supply pumps used by the water supply system is large, the result of the formula is extremely large, which is not beneficial to programming, and meanwhile, the combination items of the running pumps are easy to be missed.
In the calculation process of subsequently solving the maximum rotation speed water feed pump and the minimum rotation speed water feed pump, elements in each combination are compared one by one to solve the maximum value and the minimum value, so that the number of the corresponding water feed pump is obtained, and then the iteration speed regulation is carried out on the rotation speed of the related water feed pump.
On the basis of the foregoing embodiment, as another preferred embodiment, a multi-information fusion rotation speed balancing control method is provided, where the step S1 specifically includes:
determining the number and the rotating speed of all the water supply pumps running at the current moment based on the running state values in the digital codes of all the water supply pumps in the water supply system;
and determining the water feed pump with the maximum rotating speed and the minimum rotating speed based on the numbers and the rotating speeds of all the water feed pumps running at the current moment.
a) And combining the comprehensive information codes of all the water supply pumps, and solving the maximum value of the comprehensive information data to obtain the maximum rotation speed pump, thereby obtaining the serial number of the pump. Further reducing the rotational speed control signal quantity of the pump and reducing the rotational speed of the pump.
b) When the number of the feed pump with the minimum rotation speed in the running process is obtained, the running state of the feed pump and the state code of the check valve are inverted, namely D when the feed pump runs n When the water supply pump stops, D n =1. The number of the lowest-rotation-speed water supply pump can be obtained by the same method, and then the rotation speed control signal of the pump is increased, so that the rotation speed of the pump is increased.
c) And judging whether the rotating speed difference exceeds a set value range. And if the rotation speed exceeds the preset rotation speed, the rotation speed of the minimum rotation speed pump is increased, and the rotation speed of the maximum rotation speed pump is reduced. When the rotation speed difference is within the set value range, the adjustment of the rotation speed difference is not required.
and a), b) and c) are combined, and the maximum rotation speed difference of the system can be reduced.
On the basis of the above embodiment, as a preferred implementation manner, in the step S2, if it is determined that the rotation speed difference is not greater than the preset threshold, the rotation speed of the water pump in the water pump combination to be adjusted is not adjusted.
In summary, the greatest characteristic is that after the number of the water feed pumps is determined, the number of the data compared in the process of solving the minimum running time of the water feed pumps is determined, and the water feed pump is unique and has no multiple combinations. In the process of calculating the minimum value of the comprehensive information codes of the water feed pumps, all water feed pumps are selected for comparison, and the combination number isA kind of module is assembled in the module and the module is assembled in the module. With the rapid development of electronic technology, the data processing speed of a microprocessor is greatly improved, the proportion of time occupied by numerical comparison operation in the whole control period is extremely small, even more data comparison cannot influence the operation speed of the whole control logic, and the method has no practical influence on a process control program.
The embodiment of the application also provides a system for controlling the cluster rotation speed balance of the boiler feed pump, which is based on the method for controlling the cluster rotation speed balance of the boiler feed pump in each embodiment, and comprises the following steps:
the rotating speed determining module is used for determining two water feed pumps with the largest rotating speed difference in the water feed pumps running at the current moment in the water feed system and taking the two water feed pumps as a water feed pump combination to be adjusted;
the rotation speed balancing module is used for increasing the rotation speed of the water feed pump with the maximum rotation speed in the water feed pump combination to be regulated based on preset regulation parameters and reducing the rotation speed of the water feed pump with the minimum rotation speed in the water feed pump combination to be regulated if the rotation speed difference is judged to be greater than the preset threshold; returning to step S1.
On the basis of the above embodiment, as another preferred implementation manner, a multi-information fusion rotation speed balancing control method is provided, and further includes an encoding module, where the encoding module is configured to digitally number the water supply pump, digitally process the check valve state of the water supply pump, and perform multidimensional data combination on the operation state, the rotation speed, and the water supply pump number of the water supply pump to form a digital code corresponding to the water supply pump: when the maximum rotation speed is obtained, the water supply pump corresponds to an operation state position 1 if the water supply pump is in operation, and corresponds to an operation state position 0 if the water supply pump stops operation; when the minimum rotating speed is obtained, if the running state bit of the water supply pump is detected to be 0, all the positions corresponding to the digital codes of the water supply pump are set to be 1;
the rotating speed determining module is specifically used for determining the numbers and the rotating speeds of all the water supply pumps running at the current moment based on the running state values in the digital codes of all the water supply pumps in the water supply system;
and determining the water feed pump with the maximum rotating speed and the minimum rotating speed based on the numbers and the rotating speeds of all the water feed pumps running at the current moment.
When the number of the water feeding pump with the maximum rotation speed in the running process is obtained, data fusion is carried out on the data of the running state, the rotation speed, the pump number and the like (in the embodiment, only 3 items are listed as examples) of the water feeding pump to form the following coding information:
the method comprises the steps of performing digital processing on the state of a check valve of a water supply pump, and performing multidimensional data combination on the running state, the rotating speed and the water supply pump number of the water supply pump to form digital codes corresponding to the water supply pump: when the maximum rotation speed is obtained, the water supply pump corresponds to an operation state position 1 if the water supply pump is in operation, and corresponds to an operation state position 0 if the water supply pump stops operation; when the minimum rotating speed is obtained, if the running state bit of the water supply pump is detected to be 0, all the positions corresponding to the digital codes of the water supply pump are set to be 1;
a) And combining the comprehensive information codes of all the water supply pumps, and solving the maximum value of the comprehensive information data to obtain the maximum rotation speed pump, thereby obtaining the serial number of the pump. Further reducing the rotational speed control signal quantity of the pump and reducing the rotational speed of the pump.
b) When the number of the feed pump with the minimum rotation speed in the running process is obtained, the running state of the feed pump and the state code of the check valve are inverted, namely D when the feed pump runs n When the water supply pump stops, D n =1. The number of the lowest-rotation-speed water supply pump can be obtained by the same method, and then the rotation speed control signal of the pump is increased, so that the rotation speed of the pump is increased.
c) And judging whether the rotating speed difference exceeds a set value range. And if the rotation speed exceeds the preset rotation speed, the rotation speed of the minimum rotation speed pump is increased, and the rotation speed of the maximum rotation speed pump is reduced. When the rotation speed difference is within the set value range, the adjustment of the rotation speed difference is not required.
and a), b) and c) are combined, and the maximum rotation speed difference of the system can be reduced.
On the basis of the above embodiment, as a preferred implementation manner, an enumeration method rotation speed balance solving method is provided, where the rotation speed determining module is specifically configured to determine rotation speeds of all water feed pumps running at a current moment in the water supply system, and determine a water feed pump with a maximum rotation speed and a minimum rotation speed;
and determining the water feed pump combination with the maximum rotating speed and the minimum rotating speed as the water feed pump combination to be regulated.
In the prior art, when the running number of the water supply pumps is m, the running pump combination is as follows:
X m1 (q 1 ,q 2 ,…,q m )；
X m2 (q 2 ,q 3 ,…,q m+1 )；
……
when m water pumps are running, the water pumps need to be configuredAnd comparing and combining the serial numbers of the water supply pumps with the maximum rotation speed and the minimum rotation speed.
Therefore, the total combined number when the running number of the water supply pumps is 2-N-1
When the total number of the water supply pumps used by the water supply system is large, the result of the formula is extremely large, which is not beneficial to programming, and meanwhile, the combination items of the running pumps are easy to be missed.
In the calculation process of subsequently solving the maximum rotation speed water feed pump and the minimum rotation speed water feed pump, elements in each combination are compared one by one to solve the maximum value and the minimum value, so that the number of the corresponding water feed pump is obtained, and then the iteration speed regulation is carried out on the rotation speed of the related water feed pump.
Based on the same conception, the embodiment of the present application further provides a physical structure schematic diagram, as shown in fig. 2, where the server may include: processor 810, communication interface (Communications Interface) 820, memory 830, and communication bus 840, wherein processor 810, communication interface 820, memory 830 accomplish communication with each other through communication bus 840. The processor 810 may invoke logic instructions in the memory 830 to perform the steps of the boiler feedwater pump cluster speed balance control method described in the various embodiments above. Examples include:
step S1, determining two water feed pumps with the largest rotation speed difference in the water feed pumps running at the current moment in a water feed system, and combining the two water feed pumps as water feed pumps to be regulated;
step S2, if the rotation speed difference is judged to be larger than a preset threshold value, the rotation speed of the water feed pump with the largest rotation speed in the water feed pump combination to be regulated is increased based on a preset regulation parameter, and the rotation speed of the water feed pump with the smallest rotation speed in the water feed pump combination to be regulated is reduced; returning to step S1.
Further, the logic instructions in the memory 830 described above may be implemented in the form of software functional units and may be stored in a computer-readable storage medium when sold or used as a stand-alone product. Based on this understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
Based on the same conception, the embodiments of the present application also provide a non-transitory computer readable storage medium storing a computer program, where the computer program includes at least one section of code, and the at least one section of code may be executed by a master control device to control the master control device to implement the steps of the boiler feedwater pump cluster rotational speed balancing control method according to the embodiments above. Examples include:
step S1, determining two water feed pumps with the largest rotation speed difference in the water feed pumps running at the current moment in a water feed system, and combining the two water feed pumps as water feed pumps to be regulated;
step S2, if the rotation speed difference is judged to be larger than a preset threshold value, the rotation speed of the water feed pump with the largest rotation speed in the water feed pump combination to be regulated is increased based on a preset regulation parameter, and the rotation speed of the water feed pump with the smallest rotation speed in the water feed pump combination to be regulated is reduced; returning to step S1.
Based on the same technical concept, the embodiment of the present application also provides a computer program, which is used to implement the above-mentioned method embodiment when the computer program is executed by the master control device.
The program may be stored in whole or in part on a storage medium that is packaged with the processor, or in part or in whole on a memory that is not packaged with the processor.
Based on the same technical concept, the embodiment of the application also provides a processor, which is used for realizing the embodiment of the method. The processor may be a chip.
In summary, according to the method and system for controlling the rotation speed balance of the boiler feed pump cluster provided by the embodiments of the present application, the rotation speed balance control objective of the feed system is that the maximum rotation speed difference of each running feed pump is not greater than a preset threshold, when the rotation speed of the feed pump is higher than the preset threshold, the rotation speed of the maximum rotation speed feed pump should be reduced, and the rotation speed of the minimum rotation speed feed pump should be increased, so that the rotation speed difference between the maximum rotation speed feed pump and the minimum rotation speed feed pump is not greater than the preset threshold; in the process of calculating the water supply pump comprehensive information coding minimum value, the data processing speed of the microprocessor is greatly improved, the time proportion occupied by the numerical comparison operation in the whole control period is extremely small, the whole control logic operation speed cannot be influenced even if more data are compared, and the actual influence on a process control program is avoided. The cluster control of the water feed pumps can be realized, each water feed pump operates in a healthy state, the water feed of the boiler is ensured to be sufficient, and meanwhile, the rapid maneuverability requirement of a power system is met. The potential safety hazard brought to the control system by program multi-layer nesting is avoided; the program has strong expansibility, strong portability, little code quantity and simple style. After the comprehensive information of each pump is encoded, only the operation of obtaining the maximum value or the minimum value of each encoding is needed to find the water supply pump with the speed regulation.
The embodiments of the present application may be arbitrarily combined to achieve different technical effects.
In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions in accordance with the present application are produced in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by a wired (e.g., coaxial cable, fiber optic, digital subscriber line), or wireless (e.g., infrared, wireless, microwave, etc.). The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains an integration of one or more available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid state disk), etc.
Those of ordinary skill in the art will appreciate that implementing all or part of the above-described method embodiments may be accomplished by a computer program to instruct related hardware, the program may be stored in a computer readable storage medium, and the program may include the above-described method embodiments when executed. And the aforementioned storage medium includes: ROM or random access memory RAM, magnetic or optical disk, etc.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims (7)
1. The method for controlling the rotation speed balance of the boiler feed water pump cluster is characterized by comprising the following steps of:
step S1, performing digital processing on the state of a check valve of the water supply pump, and performing multidimensional data combination on the running state, the rotating speed and the water supply pump number of the water supply pump to form digital codes corresponding to the water supply pump: when the maximum rotation speed is obtained, the water supply pump corresponds to an operation state position 1 if the water supply pump is in operation, and corresponds to an operation state position 0 if the water supply pump stops operation; when the minimum rotating speed is obtained, if the running state bit of the water supply pump is detected to be 0, all the positions corresponding to the digital codes of the water supply pump are set to be 1;
determining two water feed pumps with the largest rotating speed difference in the water feed pumps running at the current moment in a water feed system and taking the two water feed pumps as a water feed pump combination to be regulated, wherein the water feed pump combination to be regulated specifically comprises: determining the number and the rotating speed of all the water supply pumps running at the current moment based on the running state values in the digital codes of all the water supply pumps in the water supply system; determining the water feed pump with the maximum rotating speed and the minimum rotating speed based on the numbers and the rotating speeds of all the water feed pumps running at the current moment;
step S2, if the rotation speed difference is judged to be larger than a preset threshold value, the rotation speed of the water feed pump with the minimum rotation speed in the water feed pump combination to be regulated is increased based on a preset regulation parameter, and the rotation speed of the water feed pump with the maximum rotation speed in the water feed pump combination to be regulated is reduced; returning to step S1.
2. The method for controlling the rotation speed balance of a boiler feed water pump cluster according to claim 1, wherein the step S1 specifically includes:
determining the rotation speeds of all water feed pumps running at the current moment in a water feed system, and determining the water feed pump with the maximum rotation speed and the minimum rotation speed;
and determining the water feed pump combination with the maximum rotating speed and the minimum rotating speed as the water feed pump combination to be regulated.
3. The method for controlling the rotation speed balance of the boiler feed water pump cluster according to claim 1, wherein in the step S2, if the rotation speed difference is not greater than the preset threshold, the rotation speed of the water pump in the feed water pump combination to be adjusted is not adjusted.
4. A boiler feed pump cluster rotational speed balance control system, comprising:
the rotating speed determining module is used for determining two water feed pumps with the largest rotating speed difference in the water feed pumps running at the current moment in the water feed system and taking the two water feed pumps as a water feed pump combination to be adjusted;
the rotation speed balancing module is used for increasing the rotation speed of the water feed pump with the minimum rotation speed in the water feed pump combination to be regulated based on preset regulation parameters and reducing the rotation speed of the water feed pump with the maximum rotation speed in the water feed pump combination to be regulated if the rotation speed difference is judged to be larger than the preset threshold; returning to the rotating speed determining module;
the water supply pump water supply system further comprises a coding module, wherein the coding module is used for digitally numbering the water supply pump, digitally processing the check valve state of the water supply pump, and performing multidimensional data combination on the running state, the rotating speed and the water supply pump number of the water supply pump so as to form digital codes corresponding to the water supply pump: when the maximum rotation speed is obtained, the water supply pump corresponds to an operation state position 1 if the water supply pump is in operation, and corresponds to an operation state position 0 if the water supply pump stops operation; when the minimum rotating speed is obtained, if the running state bit of the water supply pump is detected to be 0, all the positions corresponding to the digital codes of the water supply pump are set to be 1;
the rotating speed determining module is specifically used for determining the numbers and the rotating speeds of all the water supply pumps running at the current moment based on the running state values in the digital codes of all the water supply pumps in the water supply system;
and determining the water feed pump with the maximum rotating speed and the minimum rotating speed based on the numbers and the rotating speeds of all the water feed pumps running at the current moment.
5. The system according to claim 4, wherein the rotation speed determining module is specifically configured to determine rotation speeds of all the water feed pumps currently running in the water feed system, and determine the water feed pump with the largest rotation speed and the smallest rotation speed;
and determining the water feed pump combination with the maximum rotating speed and the minimum rotating speed as the water feed pump combination to be regulated.
6. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the method for controlling the rotational speed balance of a boiler feedwater pump cluster according to any of claims 1 to 3 when executing the program.
7. A non-transitory computer readable storage medium having stored thereon a computer program, which when executed by a processor, implements the steps of the boiler feedwater pump cluster rotational speed balancing control method of any of claims 1 to 3.
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