CN105674791A - Cooling tower system based on centerless network, cooling tower controller and control method - Google Patents
Cooling tower system based on centerless network, cooling tower controller and control method Download PDFInfo
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- CN105674791A CN105674791A CN201610105097.1A CN201610105097A CN105674791A CN 105674791 A CN105674791 A CN 105674791A CN 201610105097 A CN201610105097 A CN 201610105097A CN 105674791 A CN105674791 A CN 105674791A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
- F28F27/003—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus specially adapted for cooling towers
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Abstract
The invention provides a cooling tower system based on a centerless network, a cooling tower controller and a control method of the cooling tower system. The method includes the steps that one cooling tower controller is arranged on each cooling tower, and all the cooling tower controllers are connected to form the centerless network; when it is judged that a certain trigger condition is met, the cooling tower controllers initiate adjusting tasks; the cooling tower controllers start to interact with the adjacent cooling tower controllers; and after interaction is conducted multiple times, the whole system confirms optimized operation parameters of all the cooling towers, and the corresponding cooling towers are controlled to be in the corresponding operation states according to the optimized operation parameters. The method is based on the centerless network, all the cooling towers connected in parallel finish target control equally and autonomously in a coordinated manner, the optimization control scheme is worked out in a distributed manner, the workload generated during manual configuration and debugging of a traditional control manner is lowered, and the control equipment is plugged and used immediately; and the control efficiency, robustness and expandability of the system are improved.
Description
Technical field
The present invention relates to building energy conservation and field of intelligent control technology, particularly relate to a kind of cooling tower systems based on network without center, cooling tower controller and control method.
Background technology
In the cooling water system of central air-conditioning, usually use multiple stage cooling tower in parallel, realize the cooling of the high-temperature cooling water flowed out from the condenser side of cold, cooling tower systems has cooling water channel and cooling tower fan two control subsystems, by regulating the number of units of cooling tower opened and the operating frequency of fan thereof to realize the control of cooler-water temperature.
In existing control system for cooling tower, usually central controlled mode is adopted, the multiple stage cooling tower being in cold station arranges a cooling tower controller, currently common control strategy is the start and stop (cold side be generally a machine to a pump to the mode of a tower) that cold is followed in the start and stop of cooling tower, blower fan standard-sized sheet, or blower fan has the shelves position of high, normal, basic third gear to control, the exit water temperature of control cooling tower.
The drawback of this kind of control mode is, in practice of construction, it is necessary to the work such as a large amount of on-the-spot secondary development, configuration debugging, wiring; When equipment change, it is necessary to central controller is carried out the debugging of configuration again; If equipment is optimized control, it is necessary to for concrete equipment modeling, by the personnel of specialty, model being write central controller, a step debug controller of going forward side by side, human cost, time cost are very high.
Summary of the invention
The present invention is intended to one of technical problem at least solving existence in prior art. For this reason, it is an object of the present invention to propose a kind of cooling tower systems control method based on network without center. The advantage that the method has controlling efficiency height, robustness is good and extendability is good.
Another object of the present invention is to propose a kind of cooling tower systems based on network without center.
Another object of the present invention is to propose a kind of cooling tower controller.
In order to realize above-mentioned purpose, the embodiment of first aspect present invention discloses a kind of cooling tower systems control method based on network without center, comprise the following steps: for each cooling tower in described cooling tower systems arranges a cooling tower controller respectively, and by interconnected for all cooling tower controllers to form network without center;When cooling tower controller judges to reach certain triggering condition, then initiate adjustment task by this cooling tower controller; If there is the cooling tower controller initiating adjustment task in system, then the cooling tower controller that the cooling tower controller in described system starts to be adjacent carries out information interaction; Determining the operating parameter after the optimization of every platform cooling tower through system after several times information interaction, described cooling tower controller controls corresponding cooling tower according to the operating parameter after optimization and reaches corresponding running status; If system is not initiated the cooling tower controller of adjustment task, then keep cooling tower operating parameter constant.
The cooling tower systems control method based on network without center according to embodiments of the present invention, utilize the network without center that the cooling tower controller of each cooling tower band communication function is set up, make each cooling tower determine each cooling tower whether start and stop and corresponding chilled-water flow demand thereof by autonomous negotiating, make the Overall energy efficiency of cooling tower systems optimum simultaneously. The cooling tower systems control method based on network without center of the embodiment of the present invention, at least has the following advantages:
1. scene only needs to communicate to connect cooling tower controller corresponding for cooling tower adjacent in topology, each cooling tower is namely by independently working in coordination with, complete control objectives efficiently, avoid loaded down with trivial details human configuration, the debugging link of automatic control manufacturer intervention in tradition centerized fusion mode, also the plug and play of equipment be can accomplish, handiness, the extensibility of system enhanced.
2. ensure that for given control objectives in theory, the result that algorithm calculates is the heat radiation area that fully make use of cooling tower, and the flow of every platform cooling tower is not less than lower limit simultaneously, thus ensure that the homogeneity that water coolant distributes.
In addition, the cooling tower systems control method based on network without center according to the above embodiment of the present invention can also have following additional technology feature:
Further, every platform cooling tower controller all can initiate adjustment task, and all the other cooling tower controllers coordinate described adjustment task to complete system operations.
Further, if adjustment task all initiated by multiple stage cooling tower controller within the identical or close time, then carry out system operations respectively according to each adjustment task, and then determined by arbitration mechanism to perform the operation result which regulates task.
Further, if adjustment task all initiated by multiple stage cooling tower controller within the identical or close time, then first select a promoter by arbitration mechanism, then perform the adjustment task initiated by this promoter.
Further, described arbitration mechanism comprise manually specify priority, draw lots, rob make board, random specify in one or more.
Further, described triggering condition necessarily is: described cooling tower controller reaches default control cycle.
Further, described triggering condition necessarily is: cooling water flow there occurs change, and cooling pump group calculates current cooling water flow and issues the controller of cooling tower, and corresponding cooling tower controller triggers adjustment task after receiving information.
Further, the process of described information interaction determines whether the water route of every platform cooling tower opens as often as possible to open the water route of cooling tower under the flow of every platform cooling tower is higher than the prerequisite of default lower value.
Further, determine that the step whether water route of every platform cooling tower opens comprises the steps: that the controller of whole system forms a link further, information is transmitted successively to chain tail by first beginning of chain, described information comprises the flow that each cooling tower is operated in minimum flux lower limit respectively, chain tail calculates the total flux under all combinations that every platform cooling tower is operated in minimum flux lower limit or water route is not opened and selects the combination of the most satisfied requirement of total flux, and data are back to successively chain head, now each cooling tower controller knows whether it should open.
Further, the described the most satisfied requirement of total flux refers to that the total flux of each cooling tower is not less than preset lower limit value closest to the flow of system total cooling water flow demand and each cooling tower.
Further, the chain in link is first variable in information interactive process with chain tail.
Further, after system determines the operating parameter after optimizing, the opening and closing of the valve on all cooling tower controller controlled cooling model tower water routes is so that cooling tower water route reaches corresponding start and stop state.
Further, operating parameter after described optimization comprises start and stop state and/or the frequency of cooling tower fan.
Further, the start and stop state of cooling tower fan and/or rotating speed are optimized according to following principle: as long as the water valve of corresponding cooling tower is opened, then respective fans is opened, frequency conversion unified by the fan opened, and the leaving water temperature(LWT) of controlled cooling model tower reaches water outlet temperature setting value, if the rotating speed of fan reaches the lower limit of rotating speed, then close a desk fan, if the fan rotating speed opened reaches the upper limit, and the fan still having the cooling tower of valve opening is not opened, then increase a desk fan.
Further, the way of realization of described network without center be in cable network and wireless network the two one of or the two combination.
Further, the control algorithm in multiple described cooling tower controller is identical.
Further, described cooling tower controller changes the operating parameter of corresponding cooling tower by the valve that controls on corresponding cooling tower water route and cooling tower fan.
Further, the minimum flux lower limit of cooling tower is transfused in cooling tower controller.
The embodiment of second aspect present invention also discloses a kind of cooling tower systems based on network without center, comprising: multiple cooling tower, and described multiple cooling tower is arranged in parallel; Multiple cooling tower controller, described multiple cooling tower controller is connected with described multiple cooling tower correspondingly, and wherein, all cooling tower controllers are interconnected to form network without center; Described cooling tower systems utilizes the control method as described in first aspect embodiment as above-mentioned in the present invention to run.
Third aspect present invention embodiment still provides a kind of cooling tower controller, all cooling tower controllers are interconnected to form network without center, when cooling tower controller judges to reach certain triggering condition, described cooling tower controller is for initiating adjustment task, when there is the cooling tower controller initiating adjustment task in systems in which, the cooling tower controller that described cooling tower controller starts to be adjacent carries out information interaction, and the operating parameter after determining the optimization of every platform cooling tower after several times information interaction, described cooling tower controller controls corresponding cooling tower according to the operating parameter after optimization and reaches corresponding running status, and when not initiating the cooling tower controller of adjustment task in systems in which, keep corresponding cooling tower operating parameter constant.
Cooling tower systems according to embodiments of the present invention and cooling tower controller, each cooling tower equality ground is made independently to have coordinated control objectives, calculate optimization control scheme in a distributed manner, reduce the workload of the human configuration debugging of Traditional control form, achieve the plug and play of operating device, it is to increase the controlling efficiency of system, robustness and extensibility
Accompanying drawing explanation
Above-mentioned and/or the additional aspect of the present invention and advantage from accompanying drawing below combining to the description of embodiment becoming obviously and it should be readily understood that wherein:
Fig. 1 is the schematic flow sheet of the cooling tower systems control method based on network without center of the embodiment of the present invention.
Fig. 2 is the structural representation of the cooling tower systems based on network without center of the embodiment of the present invention;
Fig. 3 is the pyramid structure schematic diagram during unlatching combination in the water route of the determination cooling tower of the embodiment of the present invention.
Embodiment
According to Figure of description, the cooling tower systems control method based on network without center of the embodiment of the present invention is carried out more detailed explanation below.
As shown in Figure 1, according to an embodiment of the invention based on the cooling tower systems control method of network without center, comprise the following steps:
S101: for each cooling tower in cooling tower systems arranges a cooling tower controller respectively, and by interconnected for all cooling tower controllers to form network without center.
Wherein, network without center refers to that the status of the node of each in network is equality, whole network is flat, the concept not having center or head, this network can be chain shape, it is possible to be ring-type, it can also be latticed or star, namely interconnected with certain topology relation between all nodes in network, and fasten in topology pass and between interconnected node, carry out information transmission, fasten in topology pass and between the node being not related to connection, do not carry out information interaction. For the cooling tower systems of the embodiment of the present invention, the status of each cooling tower in network without center is all equality, each cooling tower in parallel has independently coordinated control objectives by corresponding cooling tower controller equality ground, calculate optimization control scheme in a distributed manner, like this, the workload of the human configuration debugging of Traditional control form can be reduced, it is achieved the plug and play of operating device, it is to increase the controlling efficiency of system, robustness and extensibility. Such as: if newly-increased cooling tower, it is only necessary to it is in parallel with other cooling tower, then newly-increased cooling tower is arranged a cooling tower controller identical with other cooling tower controller, and this cooling tower controller is added in above-mentioned network without center.
Fig. 2 is the structural representation of the cooling tower systems based on network without center of one embodiment of the invention. As shown in Figure 2, cooling tower systems comprise n (usual n be greater than 1 positive integer) cooling tower of individual parallel connection, each cooling tower is configured with a cooling tower controller.
Shown in composition graphs 2, the way of realization of network without center that multiple cooling tower controller is formed can be the combination both in cable network and wireless network one or both of. That is, can be connected by cable network, wireless network or the integrated network in conjunction with wire and wireless two kinds of forms between multiple cooling tower controller, form network without center. It should be noted that, network without center in the embodiment of the present invention can adopt various communications protocols to communicate, as long as real-time and the validity of communication can be ensured, that is, the network without center of the embodiment of the present invention is not limited to any concrete communication control processor, as long as can carry out meeting the network communication of requirement and controlling, thus, node control network or network herein can carry out understanding and limiting with implication in technical field comparatively widely.
S102: when certain cooling tower controller judges to reach certain triggering condition, then initiate adjustment task by this cooling tower controller.
In the concrete example of the present invention, the cooling tower controller that every platform cooling tower is corresponding all can initiate adjustment task, and when wherein adjustment task initiated by a cooling tower controller, remaining cooling tower controller then coordinates this cooling tower controller to complete the computing of system.
In addition, due to the multiple cooling tower controller structure in the embodiment of the present invention is network without center, the sequence of control that each cooling tower controller runs is identical, accordingly, it is possible within the identical or close time, multiple cooling tower controller all meets task initiates condition and initiates adjustment task, for this kind of situation, system needs to arrange corresponding treatment mechanism, in one embodiment of the invention, it is possible to processed by the following two kinds mode.
One, the arbitration mechanism of aftertreatment is first calculated, specifically, first, calculating one time respectively for each adjustment task, several non-stop layer cooling tower controllers have connected to form non-stop layer computational grid, are equal to an operating system, support that multi-task parallel processes under this system, thus when there being multiple cooling tower controller to initiate adjustment task simultaneously, system can simultaneously computing, obtain multiple result. And then by arbitration mechanism, select and perform the result which regulates task.
Two, the arbitration mechanism calculated afterwards is first processed, specifically, first determine that who initiates adjustment task by arbitration mechanism, then adjustment task is initiated by it, that is: when running into multiple cooling tower controller and initiate adjustment task simultaneously, first select a promoter by arbitration mechanism, then initiate adjustment task by it.
First the arbitration mechanism calculated afterwards owing to first processing determines which cooling tower controller to initiate adjustment task by, therefore, the arbitration mechanism of aftertreatment is first calculated relative to the first, calculated amount is few, therefore, in most cases, it is possible to use the 2nd kind first processes the arbitration mechanism calculated afterwards to reduce calculated amount.
In one embodiment of the invention, the form of arbitration mechanism is also various, include but not limited to following several mode: in advance by manually specifying priority, operational process determines to take which kind of operation result according to priority set, draws lots, rob and make board, at random appointment etc.
Wherein, arbitration mode is to protect cooling tower water route not frequent start-stop, the adjustment task no matter which platform cooling tower is initiated, its the possibility of result obtained is all optimal result, but system generally has the cooling tower of multiple stage same model, such as T1, T2, T3, the cooling tower of three same models, several groups of results calculated open [T1, T2], [T1, T3], [T2, T3], and what currently running is these two cooling towers of T1 and T2, in order to avoid the frequent start-stop of cooling tower, frequent switching, arbitration result should be selected to open [T1, T2] corresponding scheme.
About triggering condition, in the concrete example of the present invention, triggering condition can have various ways, such as the form of (1), (2) below.
(1) can determine according to the time, such as, set a control cycle for each cooling tower controller, often spend the regular hour and just initiate Primary regulation task by this cooling tower controller; Such as the control cycle of cooling tower controller can be set to 5 minutes, when arriving control cycle, request task first initiated by corresponding cooling tower controller every time, read group total is initiated to cold station system, such as initiate read group total to the controller of cooling pump, obtain the total flux of current water coolant, then start to calculate.
(2) cooling pump side condition triggers: when the operation condition of cooling pump there occurs change, as frequency there occurs that change or number of units there occurs change, these all can cause the change of cooling water flow, now cooling pump group calculates current cooling water flow, then cooling tower is initiatively issued, after cooling tower receives information, initiate adjustment task, regulate.
S103: when there is the cooling tower controller initiating adjustment task in system, the cooling tower controller that the cooling tower controller in system starts to be adjacent carries out information interaction.
The process of information interaction is the process that chain type calculates, and process for the information interaction of cooling tower is described in detail below.
The control of cooling tower systems is divided into cooling tower unit number control (namely opening the water route of how many cooling towers) and cooling tower fan control (namely selecting whether cooling tower fan is opened and should be operated in what frequency) two subsystems, is described respectively below.
The main power consumption parts of cooling tower systems are cooling tower fan, its power is compared relatively little with cold with water pump, thus in order to ensure that cold is operated under higher efficiency, the cooling power of cooling tower systems should be made full use of, reduce the water temperature of water coolant as far as possible, increase in the energy consumption that the fan of cooling tower systems brings is insensitive for whole cold station system, the control thought that thus can determine the unit number control of cooling tower systems is: the high-temperature cooling water flowed out from the condenser side of cold should be tried one's best and evenly is assigned to each cooling tower, namely in the conceived case, as often as possible open the water coolant water route (even the valve open on cooling water pipeline) of cooling tower, water coolant is made to flow uniformly through each cooling tower to make full use of the heat interchanging area of cooling tower.
And the control thought of the fan control of cooling tower is: frequency conversion unified by the fan of the cooling tower that water route is opened, and total leaving water temperature(LWT) of controlled cooling model tower system reaches set(ting)value.
But the control in cooling tower water route also has a control condition, the cooling water flow flowing through each cooling tower exactly should not excessively little (such as can not be less than the 40% of this cooling tower rated flow), otherwise water coolant can be caused on the contrary to distribute inequality between each cooling tower, the cooling of water coolant is caused disadvantageous impact, it is thus desirable to arrange a lower limit for the cooling water flow of every platform cooling tower, at the flow of every platform cooling tower higher than the water route as often as possible opening cooling tower during lower limit.
Thus, the unit number control problem of cooling tower can be converted to the distribution problem of water coolant total flux, namely when given water coolant total flux ∑ G (this value can be the water coolant total flux that outside passes over), which how to select to open platform cooling tower so that the flow that every platform is opened is not less than lower limit G* i, the number of units simultaneously opened is maximum.
Composition graphs 3, addresses this problem and can adopt following algorithm:
First by spanning tree process, all cooling tower controllers being formed a link, chain two ends are respectively initial node v1With termination node vm, or it is called chain head and chain tail, then along chain node-by-node algorithm, after terminating node calculate, do final decision, then pointwise passback result. Whole search procedure once completes, it is not necessary to loop iteration, and specific algorithm is:
1) chain first launch task, propagates spanning tree (chain) instruction, until chain tail;
2) return spanning tree instruction by chain tail pointwise, complete the foundation of spanning tree;
3) chain first open begin calculate and outwards transmit following information, oneself close time value ∑ G (the water coolant total flux of system) and oneself unlatching time value ∑ G-G* 1, G* 1For cooling water flow lower limit when the first cooling tower of chain works, and pointwise performs operation below;
4) after each node receives information (being an array comprising k), for every number wherein, calculate and oneself do not open and open and the amount of remaining water coolant when being operated in cooling water flow lower limit, then new array (for comprising the array of 2k number) is issued its neighbor node;
5) after the node of end receives data, in internal calculation, the number eliminating being less than zero (is less than zero and shows that this kind is opened the flux lower limit sum combining lower each cooling tower and be greater than water coolant total flux, thus after actual unlatching, the actual flow that every platform cooling tower is got is less than flux lower limit), and find the immediate value with zero, the combination of cooling tower corresponding with it is final running scheme.Then all nodes are passed this combination to passback.
6) each node knows oneself whether right start and stop situation.
Which adopts node-by-node algorithm, and each node considers to participate in or do not participate in combination two kinds of situations simultaneously, thus forms the framework of a pyramid, as described in Figure 3. Meaning to pass to last node, after last node completes combination calculation, total 2m combination, which includes situation about all not participating in. So this algorithm enumerates all combined situation in limited step, it is complete.
If it should be noted that, joint of the chain tail has the value of multiple scheme identical when calculating and be, then select according to following principle: in order to avoid the switching of frequent start-stop, that group that prioritizing selection physical distance is nearest.
The control method of cooling tower fan is specifically described below:
The air-blower control rule of cooling tower is as follows: as long as the water valve of this cooling tower is opened, namely this cooling tower comes into operation, and its blower fan is opened; The blower fan opened unifies frequency conversion, the leaving water temperature(LWT) of controlled cooling model tower, reaches water outlet temperature setting value (the control algorithm that the given employing of set(ting)value is other); If the rotating speed of frequency conversion fan reaches the lower limit of rotating speed, then close a typhoon machine; If the rotation speed of fan opened reaches the upper limit, and the blower fan still having the cooling tower of valve opening is not opened, then increase a typhoon machine.
S104: the operating parameter after system determines the optimization of every platform cooling tower, cooling tower controller controls corresponding cooling tower according to the operating parameter after optimization and reaches corresponding running status.
S105: if not initiating the cooling tower controller of adjustment task in system, then the operating parameter that the cooling tower in system keeps original is constant.
In above-mentioned computation process, it is necessary to cooling tower flux lower limit value can be built in the middle of cooling tower controller.
The cooling tower systems control method based on network without center according to embodiments of the present invention, utilize the network without center that the cooling tower controller of each cooling tower band communication function in parallel is set up, making each cooling tower in parallel be determined the start and stop in each cooling tower water route and the start and stop of fan and rotating speed by autonomous negotiating, when making full use of the heat radiation area of cooling tower, the flow of every platform cooling tower is not less than flux lower limit. The cooling tower systems control method based on network without center of the embodiment of the present invention, at least has the following advantages:
1. scene only needs to communicate to connect controller corresponding for cooling tower adjacent in topology, cooling tower in parallel is namely by independently working in coordination with, complete control objectives efficiently, avoid loaded down with trivial details human configuration, the debugging link of automatic control manufacturer intervention in tradition centerized fusion mode, also the plug and play of equipment be can accomplish, handiness, the extensibility of system enhanced.
2. ensure that for given control objectives in theory, the result that algorithm calculates is the heat radiation area that fully make use of cooling tower, and the flow of every platform cooling tower is not less than lower limit simultaneously, thus ensure that the homogeneity that water coolant distributes.
Further, shown in composition graphs 2, further embodiment of the present invention also discloses a kind of cooling tower systems based on network without center, comprising: multiple cooling tower and multiple cooling tower controller.
Wherein, multiple cooling tower is arranged in parallel; Multiple cooling tower controller is connected with multiple cooling tower correspondingly, and described cooling tower systems utilizes control method as described in the above embodiment the present invention to run.
As shown in Figure 2, cooling tower systems comprise n (usual n be greater than 1 positive integer) cooling tower of individual parallel connection, each cooling tower is configured with a cooling tower controller.Shown in composition graphs 2, the way of realization of network without center that multiple cooling tower controller is formed can be the combination both in cable network and wireless network one or both of. That is, can be connected by cable network, wireless network or the integrated network in conjunction with wire and wireless two kinds of forms between multiple cooling tower controller, form network without center. It should be noted that, network without center in the embodiment of the present invention can adopt various communications protocols to communicate, as long as real-time and the validity of communication can be ensured, that is, the network without center of the embodiment of the present invention is not limited to any concrete communication control processor, as long as can carry out meeting the network communication of requirement and controlling, thus, node control network or network herein can carry out understanding and limiting with implication in technical field comparatively widely.
Composition graphs 2 again, each cooling tower controller can also be connected with the valve in cooling tower water route, to realize the start and stop in cooling tower water route by controlling corresponding valve; Each cooling tower controller also fan with corresponding cooling tower be connected, to control respective fans the reaching rotating speed needing start and stop state and needs. When certain cooling tower controller judges to reach certain triggering condition, then initiate adjustment task by this cooling tower controller.
In the concrete example of the present invention, every platform cooling tower controller all can initiate adjustment task, and when wherein adjustment task initiated by a cooling tower controller, remaining cooling tower controller then coordinates this cooling tower controller to complete the computing of system.
In addition, due to the multiple cooling tower controller structure in the embodiment of the present invention is network without center, the sequence of control that each cooling tower controller runs is identical, accordingly, it is possible within the identical or close time, multiple cooling tower controller all meets task initiates condition and initiates adjustment task, for this kind of situation, system needs to arrange corresponding treatment mechanism, in one embodiment of the invention, it is possible to processed by the following two kinds mode.
One, the arbitration mechanism of aftertreatment is first calculated, specifically, first, calculating one time respectively for each adjustment task, several non-stop layer cooling tower controllers have connected to form non-stop layer computational grid, are equal to an operating system, support that multi-task parallel processes under this system, thus when there being multiple cooling tower controller to initiate adjustment task simultaneously, system can simultaneously computing, obtain multiple result. And then by arbitration mechanism, select and perform the result which regulates task.
Two, the arbitration mechanism calculated afterwards is first processed, specifically, first determine that who initiates adjustment task by arbitration mechanism, then adjustment task is initiated by it, that is: when running into multiple cooling tower controller and initiate adjustment task simultaneously, first select a promoter by arbitration mechanism, then initiate adjustment task by it.
First the arbitration mechanism calculated afterwards owing to first processing determines which cooling tower controller to initiate adjustment task by, therefore, the arbitration mechanism of aftertreatment is first calculated relative to the first, calculated amount is few, therefore, in most cases, it is possible to use the 2nd kind first processes the arbitration mechanism calculated afterwards to reduce calculated amount.
In one embodiment of the invention, the form of arbitration mechanism is also various, include but not limited to following several mode: in advance by manually specifying priority, operational process determines to take which kind of operation result according to priority set, draws lots, rob and make board, at random appointment etc.
Wherein, arbitration mode is to protect cooling tower not frequent start-stop, the adjustment task no matter which platform cooling tower controller is initiated, its the possibility of result obtained is all optimal result, but system generally has the cooling tower of multiple stage same model, such as T1, T2, T3, the cooling tower of three same models, several groups of results calculated open [T1, T2], [T1, T3], [T2, T3], and what currently running is these two cooling towers of T1 and T2, in order to avoid the frequent start-stop of water pump, frequent switching, arbitration result should be selected to open [T1, T2] corresponding scheme.
About triggering condition, in the concrete example of the present invention, triggering condition can have various ways, such as the form of (1), (2) below.
(1) can determine according to the time, such as, set a control cycle for each cooling tower controller, often spend the regular hour and just initiate Primary regulation task by this cooling tower controller; Such as the control cycle of cooling tower controller can be set to 5 minutes, when arriving control cycle, request task first initiated by corresponding cooling tower controller every time, read group total is initiated to cold station system, such as initiate read group total to the controller of cooling pump, obtain the total flux of current water coolant, then start to calculate. (2) cooling pump side condition triggers: when the operation condition of cooling pump there occurs change, as frequency there occurs that change or number of units there occurs change, these all can cause the change of cooling water flow, now cooling pump group calculates current cooling water flow, then cooling tower is initiatively issued, after cooling tower receives information, initiate adjustment task, regulate.
When there is the cooling tower controller initiating adjustment task in system, the cooling tower controller that the cooling tower controller in system starts to be adjacent carries out information interaction.
The process of information interaction is the process that a chain type calculates, and the Method and Process of concrete calculating is identical with aforesaid chain type method of calculation, repeats no more herein.
Further, the invention allows for a kind of cooling tower controller, all cooling tower controllers are interconnected to form network without center, when cooling tower controller judges to reach certain triggering condition, cooling tower controller is for initiating adjustment task, when there is the cooling tower controller initiating adjustment task in systems in which, the cooling tower controller that this cooling tower controller starts to be adjacent carries out information interaction, and the operating parameter after determining the optimization of every platform cooling tower after several times information interaction, cooling tower controller controls corresponding cooling tower according to the operating parameter after optimization and reaches corresponding running status, and when not initiating the cooling tower controller of adjustment task in systems in which, keep corresponding cooling tower operating parameter constant.
In one embodiment of the invention, the process of described information interaction determines whether the water route of every platform cooling tower opens as often as possible to open the water route of cooling tower under the flow of every platform cooling tower is higher than the prerequisite of default lower value.
In one embodiment of the invention, it is determined that the step whether water route of every platform cooling tower opens comprises the steps: further
The cooling tower controller of whole system forms a link, information is transmitted successively to chain tail by first beginning of chain, this information comprises the flow that each cooling tower is operated in minimum flux lower limit respectively, chain tail calculates the total flux under all combinations that every platform cooling tower is operated in minimum flux lower limit or water route is not opened and selects the combination of the most satisfied requirement of total flux, and data are back to successively chain head, now each cooling tower controller knows whether it should open. Concrete computation process can see a front embodiment.
In one embodiment of the invention, the above-mentioned the most satisfied requirement of total flux refers to that the total flux of each cooling tower is not less than preset lower limit value closest to the flow of system total cooling water flow demand and each cooling tower.
In one embodiment of the invention, the chain in link is first variable in information interactive process with chain tail.
In one embodiment of the invention, after system determines the operating parameter after optimizing, the opening and closing of the valve on all cooling tower controller controlled cooling model tower water routes is so that cooling tower water route reaches corresponding start and stop state.
In one embodiment of the invention, operating parameter after described optimization comprises start and stop state and/or the frequency of cooling tower fan.
In one embodiment of the invention, the start and stop state of cooling tower fan and/or rotating speed are optimized according to following principle: as long as the water valve of corresponding cooling tower is opened, then respective fans is opened; Frequency conversion unified by the fan opened, and the leaving water temperature(LWT) of controlled cooling model tower reaches water outlet temperature setting value; If the rotating speed of fan reaches the lower limit of rotating speed, then close a desk fan; If the fan rotating speed opened reaches the upper limit, and the fan still having the cooling tower of valve opening is not opened, then increase a desk fan.
Cooling tower controller according to embodiments of the present invention, each cooling tower equality ground in parallel is made independently to have coordinated control objectives, calculate optimization control scheme in a distributed manner, reduce the workload of the human configuration debugging of Traditional control form, achieve the plug and play of operating device, it is to increase the controlling efficiency of system, robustness and extensibility.
It should be noted that, the specific implementation of the cooling tower controller of the embodiment of the present invention and method and/or components of system as directed are similar for the specific implementation of cooling tower controller, specifically refer to the description of method and/or components of system as directed, in order to reduce redundancy, do not repeat.
Claims (27)
1. the cooling tower systems control method based on network without center, it is characterised in that, comprise the following steps:
For each cooling tower in described cooling tower systems arranges a cooling tower controller respectively, and by interconnected for all cooling tower controllers to form network without center;
When cooling tower controller judges to reach certain triggering condition, then initiate adjustment task by this cooling tower controller;
If there is the cooling tower controller initiating adjustment task in system, then the cooling tower controller that the cooling tower controller in described system starts to be adjacent carries out information interaction;
Determining the operating parameter after the optimization of every platform cooling tower through system after several times information interaction, described cooling tower controller controls corresponding cooling tower according to the operating parameter after optimization and reaches corresponding running status;
If system is not initiated the cooling tower controller of adjustment task, then keep cooling tower operating parameter constant.
2. method according to claim 1, it is characterised in that: every platform cooling tower controller all can initiate adjustment task, and all the other cooling tower controllers coordinate described adjustment task to complete system operations.
3. method according to claim 2, it is characterized in that: if adjustment task all initiated by multiple stage cooling tower controller within the identical or close time, then carry out system operations respectively according to each adjustment task, and then determined by arbitration mechanism to perform the operation result which regulates task.
4. method according to claim 2, it is characterised in that: if adjustment task all initiated by multiple stage cooling tower controller within the identical or close time, then first select a promoter by arbitration mechanism, then perform the adjustment task initiated by this promoter.
5. method according to claim 3 or 4, it is characterised in that: described arbitration mechanism comprise manually specify priority, draw lots, rob make board, random specify in one or more.
6. method according to claim 1, it is characterised in that: described triggering condition necessarily is: described cooling tower controller reaches default control cycle.
7. method according to claim 1, it is characterized in that: described triggering condition necessarily is: cooling water flow there occurs change, cooling pump group calculates current cooling water flow and issues the controller of cooling tower, and corresponding cooling tower controller triggers adjustment task after receiving information.
8. method according to claim 1, it is characterised in that: the process of described information interaction determines whether the water route of every platform cooling tower opens as often as possible to open the water route of cooling tower under the flow of every platform cooling tower is higher than the prerequisite of default lower value.
9. method according to claim 8, it is characterised in that: determine that the step whether water route of every platform cooling tower opens comprises the steps: further
The controller of whole system forms a link, information is transmitted successively to chain tail by first beginning of chain, described information comprises the flow that each cooling tower is operated in minimum flux lower limit respectively, chain tail calculates the total flux under all combinations that every platform cooling tower is operated in minimum flux lower limit or water route is not opened and selects the combination of the most satisfied requirement of total flux, and data are back to successively chain head, now each cooling tower controller knows whether it should open.
10. method according to claim 9, it is characterised in that: the described the most satisfied requirement of total flux refers to that the total flux of all cooling towers is not less than preset lower limit value closest to the flow of system total cooling water flow demand and each cooling tower.
11. methods according to claim 9, it is characterised in that: the chain in link is first and chain tail is variable in information interactive process.
12. methods according to claim 1, it is characterised in that: after system determines the operating parameter after optimizing, the opening and closing of the valve on all cooling tower controller controlled cooling model tower water routes is so that cooling tower water route reaches corresponding start and stop state.
13. methods according to claim 1, it is characterised in that: the operating parameter after described optimization comprises start and stop state and/or the frequency of cooling tower fan.
14. methods according to claim 13, it is characterized in that: the start and stop state of cooling tower fan and/or rotating speed are optimized according to following principle: as long as the water valve of corresponding cooling tower is opened, then respective fans is opened, frequency conversion unified by the fan opened, the leaving water temperature(LWT) of controlled cooling model tower reaches water outlet temperature setting value, if the rotating speed of fan reaches the lower limit of rotating speed, then close a desk fan, if the fan rotating speed opened reaches the upper limit, and the fan still having the cooling tower of valve opening do not open, then increase a desk fan.
15. methods according to claim 1, it is characterised in that: the way of realization of described network without center be in cable network and wireless network the two one of or the two combination.
16. methods according to claim 1, it is characterised in that: the control algorithm in multiple described cooling tower controller is identical.
17. methods according to claim 1, it is characterised in that: described cooling tower controller changes the operating parameter of corresponding cooling tower by the valve that controls on corresponding cooling tower water route and cooling tower fan.
18. methods according to claim 9, it is characterised in that: the minimum flux lower limit of cooling tower is transfused in cooling tower controller.
19. 1 kinds of cooling tower systems based on network without center, it is characterised in that, comprising:
Multiple cooling tower, described multiple cooling tower is arranged in parallel;
Multiple cooling tower controller, described multiple cooling tower controller is connected with described multiple cooling tower correspondingly, and wherein, all cooling tower controllers are interconnected to form network without center;
Described cooling tower systems utilizes the control method as described in item as arbitrary in claim 1 to 18 to run.
20. 1 kinds of cooling tower controllers, it is characterized in that, all cooling tower controllers are interconnected to form network without center, when cooling tower controller judges to reach certain triggering condition, described cooling tower controller is for initiating adjustment task, when there is the cooling tower controller initiating adjustment task in systems in which, the cooling tower controller that described cooling tower controller starts to be adjacent carries out information interaction, and the operating parameter after determining the optimization of every platform cooling tower after several times information interaction, described cooling tower controller controls corresponding cooling tower according to the operating parameter after optimization and reaches corresponding running status, and when not initiating the cooling tower controller of adjustment task in systems in which, keep corresponding cooling tower operating parameter constant.
21. cooling tower controllers according to claim 20, it is characterised in that: the process of described information interaction determines whether the water route of every platform cooling tower opens as often as possible to open the water route of cooling tower under the flow of every platform cooling tower is higher than the prerequisite of default lower value.
22. cooling tower controllers according to claim 21, it is characterised in that: determine that the step whether water route of every platform cooling tower opens comprises the steps: further
The cooling tower controller of whole system forms a link, information is transmitted successively to chain tail by first beginning of chain, described information comprises the flow that each cooling tower is operated in minimum flux lower limit respectively, chain tail calculates the total flux under all combinations that every platform cooling tower is operated in minimum flux lower limit or water route is not opened and selects the combination of the most satisfied requirement of total flux, and data are back to successively chain head, now each cooling tower controller knows whether it should open.
23. cooling tower controllers according to claim 22, it is characterised in that: the described the most satisfied requirement of total flux refers to that the total flux of each cooling tower is not less than preset lower limit value closest to the flow of system total cooling water flow demand and each cooling tower.
24. cooling tower controllers according to claim 22, it is characterised in that: the chain in link is first and chain tail is variable in information interactive process.
25. cooling tower controllers according to claim 20, it is characterised in that: after system determines the operating parameter after optimizing, the opening and closing of the valve on all cooling tower controller controlled cooling model tower water routes is so that cooling tower water route reaches corresponding start and stop state.
26. cooling tower controllers according to claim 20, it is characterised in that: the operating parameter after described optimization comprises start and stop state and/or the frequency of cooling tower fan.
27. cooling tower controllers according to claim 26, it is characterized in that: the start and stop state of cooling tower fan and/or rotating speed are optimized according to following principle: as long as the water valve of corresponding cooling tower is opened, then respective fans is opened, frequency conversion unified by the fan opened, the leaving water temperature(LWT) of controlled cooling model tower reaches water outlet temperature setting value, if the rotating speed of fan reaches the lower limit of rotating speed, then close a desk fan, if the fan rotating speed opened reaches the upper limit, and the fan still having the cooling tower of valve opening do not open, then increase a desk fan.
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