CN112665233A - Control method and device for chilled water secondary pump, controller and water pump system - Google Patents
Control method and device for chilled water secondary pump, controller and water pump system Download PDFInfo
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Abstract
The invention relates to a control method, a control device and a water pump system of a chilled water secondary pump, wherein the control method of the chilled water secondary pump comprises the following steps: respectively collecting original water supply temperature on a water supply main pipe and original water return temperature on a water return main pipe; respectively processing the original water supply temperature and the original water return temperature to obtain an effective water supply temperature and an effective water return temperature; and adjusting the frequency of a secondary pump according to the effective water supply temperature and the effective water return temperature so as to control the water outlet flow. The control method of the invention firstly eliminates the hysteresis of the water supply temperature and the water return temperature, and then utilizes the difference value of the water supply temperature and the water return temperature to adjust the frequency of the secondary pump so as to control the water outlet flow, thereby avoiding the occurrence of the phenomenon of 'over-regulation', improving the stability of the water pump system and being beneficial to improving the energy efficiency of the water pump system.
Description
Technical Field
The invention relates to the technical field of water pump control, in particular to a control method and device of a chilled water secondary pump, a controller and a water pump system.
Background
At present, the frequency conversion technology of the chilled water secondary pump in China mainly realizes regulation of the secondary pump by acquiring the flow of chilled water in a secondary pump system and pressure values of a water supply end and a water return end and comparing pressure difference between the two ends, so that the energy efficiency is improved. In addition, there is a control method for adjusting the frequency of the water pump by using temperature so as to adjust the flowing speed of water in the pipeline and control the flow rate entering the heat exchanger, and the energy-saving rate of the method adopting temperature control is the highest, but the method has the following defects:
1. there is a severe "hysteresis" in temperature control: the system has larger thermal inertia, so the temperature change is obviously delayed, and after the rotating speed of the secondary water pump is adjusted, the temperature of the system cannot reflect the change of flow in time, so the phenomenon of 'over-adjustment' is easily caused, and the fluctuation of the return water temperature is larger.
2. The energy consumption is great, the wasting of resources: the phenomenon of 'overshoot' causes poor stability of the system, and a frequency converter, a water pump and the like do much useless work, thereby causing the waste of large energy consumption of the system.
3. In addition, the method needs the temperature difference of the freezing water of the test point to have obvious change along with the change of the load.
Therefore, the existing method adopting temperature control has poor precision and stability.
Disclosure of Invention
In view of this, the present invention provides a method and an apparatus for controlling a chilled water secondary pump, a controller and a water pump system.
In order to achieve the purpose, the invention adopts the following technical scheme: a control method of a chilled water secondary pump comprises the following steps:
respectively collecting original water supply temperature on a water supply main pipe and original water return temperature on a water return main pipe;
respectively processing the original water supply temperature and the original water return temperature to obtain an effective water supply temperature and an effective water return temperature;
and adjusting the frequency of a secondary pump according to the effective water supply temperature and the effective water return temperature so as to control the water outlet flow.
Optionally, processing the original water supply temperature to obtain an effective water supply temperature includes:
converting the original water supply temperature into water supply temperature deviation received by a water pump system, and calculating the deviation change rate of the water supply temperature deviation;
after the water supply temperature deviation and the temperature difference change rate are used as input signals and are subjected to fuzzy PID control calculation, pre-estimation compensation processing is carried out, and a water supply temperature signal with hysteresis influence eliminated is obtained;
and filtering the water supply temperature signal with the hysteresis influence eliminated to obtain the effective water supply temperature.
Optionally, the filtering the supply water temperature signal with the hysteresis effect eliminated includes:
filtering the water supply temperature signal with the hysteresis influence eliminated by using a transfer function;
wherein the transfer function is a function containing a time variable, the time variable being determined by a fuzzy adaptive mechanism;
the fuzzy self-adapting mechanism is a processing module with two inputs and one output, the two inputs are respectively the estimated compensation output and the deviation of the controlled object, and the change rate of the deviation, and the output is a time variable.
Optionally, the processing the original return water temperature to obtain an effective return water temperature includes:
converting the original return water temperature into return water temperature deviation received by a water pump system, and calculating the deviation change rate of the return water temperature deviation;
after the return water temperature deviation and the temperature difference change rate are used as input signals and are subjected to fuzzy PID control calculation, pre-estimation compensation processing is carried out, and a return water temperature signal with hysteresis influence eliminated is obtained;
and filtering the backwater temperature signal without the hysteresis influence to obtain the effective backwater temperature.
Optionally, the filtering the backwater temperature signal without the hysteresis influence includes:
filtering the backwater temperature signal without the hysteresis influence by using a transfer function;
wherein the transfer function is a function containing a time variable, the time variable being determined by a fuzzy adaptive mechanism;
the fuzzy self-adapting mechanism is a processing module with two inputs and one output, the two inputs are respectively the estimated compensation output and the deviation of the controlled object, and the change rate of the deviation, and the output is a time variable.
Optionally, the adjusting the frequency of the secondary pump according to the effective water supply temperature and the effective water return temperature includes:
calculating the difference value between the effective water supply temperature and the effective water return temperature;
and adjusting the frequency of the secondary pump according to the difference value.
Optionally, the adjusting the frequency of the secondary pump according to the difference includes:
when the absolute value of the difference is larger than the preset temperature value, reducing the frequency of the secondary pump;
when the absolute value of the difference is smaller than the preset temperature value, increasing the frequency of the secondary pump;
when the absolute value of the difference is equal to the preset temperature value, the frequency of the secondary pump is kept unchanged.
The invention also provides a control device of the chilled water secondary pump, which comprises:
the temperature acquisition module is used for respectively acquiring the original water supply temperature on the water supply main pipe and the original water return temperature on the water return main pipe;
the processing module is used for respectively processing the original water supply temperature and the original water return temperature to obtain an effective water supply temperature and an effective water return temperature;
and the adjusting module is used for adjusting the frequency of the secondary pump according to the effective water supply temperature and the effective water return temperature so as to control the water outlet flow.
The invention also provides a controller for executing the control method of the chilled water secondary pump.
The present invention also provides a water pump system, comprising: the control device of the chilled water secondary pump is as described above.
By adopting the technical scheme, the control method of the chilled water secondary pump comprises the following steps: respectively collecting original water supply temperature on a water supply main pipe and original water return temperature on a water return main pipe; respectively processing the original water supply temperature and the original water return temperature to obtain an effective water supply temperature and an effective water return temperature; and adjusting the frequency of a secondary pump according to the effective water supply temperature and the effective water return temperature so as to control the water outlet flow. The control method of the invention firstly eliminates the hysteresis of the water supply temperature and the water return temperature, and then utilizes the difference value of the water supply temperature and the water return temperature to adjust the frequency of the secondary pump so as to control the water outlet flow, thereby avoiding the occurrence of the phenomenon of 'over-regulation', improving the stability of the water pump system and being beneficial to improving the energy efficiency of the water pump system.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic flow chart of an embodiment of a method for controlling a chilled water secondary pump according to the present invention;
FIG. 2 is a schematic flow chart of a secondary chilled water pump according to a second embodiment of the present invention;
FIG. 3 is a schematic structural diagram provided by an embodiment of a control device of a chilled water secondary pump according to the present invention;
FIG. 4 is a schematic diagram of a fuzzy Smith intelligent control architecture.
In the figure: 1. a temperature acquisition module; 2. a processing module; 3. and an adjusting module.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
Fig. 1 is a schematic flow chart provided in an embodiment of a method for controlling a chilled water secondary pump according to the present invention.
As shown in fig. 1, a control method of a secondary pump for chilled water according to this embodiment includes:
s11: respectively collecting original water supply temperature on a water supply main pipe and original water return temperature on a water return main pipe;
s12: respectively processing the original water supply temperature and the original water return temperature to obtain an effective water supply temperature and an effective water return temperature;
the effective water supply temperature is a temperature value of the acquired original water supply temperature with hysteresis eliminated; the effective return water temperature refers to a temperature value obtained by eliminating hysteresis of the acquired original return water temperature.
S13: and adjusting the frequency of a secondary pump according to the effective water supply temperature and the effective water return temperature so as to control the water outlet flow.
Further, the adjusting the frequency of the secondary pump according to the effective water supply temperature and the effective water return temperature includes:
calculating the difference value between the effective water supply temperature and the effective water return temperature;
and adjusting the frequency of the secondary pump according to the difference value.
Further, the adjusting the frequency of the secondary pump according to the difference value comprises:
when the absolute value of the difference is larger than the preset temperature value, reducing the frequency of the secondary pump;
when the absolute value of the difference is smaller than the preset temperature value, increasing the frequency of the secondary pump;
when the absolute value of the difference is equal to the preset temperature value, the frequency of the secondary pump is kept unchanged.
Fig. 2 is a schematic flow chart of a control method of a chilled water secondary pump according to a second embodiment of the present invention.
As shown in fig. 2, the control method of the secondary pump for chilled water according to the embodiment includes:
s201: collecting the original water supply temperature on a water supply main pipe;
s202: converting the original water supply temperature into water supply temperature deviation received by a water pump system, and calculating the deviation change rate of the water supply temperature deviation;
s203: taking the water supply temperature deviation and the temperature difference change rate as input signals and calculating through fuzzy PID control;
s204: performing pre-estimation compensation processing to obtain a water supply temperature signal for eliminating hysteresis influence;
s205: filtering the water supply temperature signal with the lag influence eliminated to obtain an effective water supply temperature T1;
further, the filtering the supply water temperature signal for eliminating the hysteresis influence includes:
filtering the water supply temperature signal with the hysteresis influence eliminated by using a transfer function;
wherein the transfer function is a function containing a time variable, the time variable being determined by a fuzzy adaptive mechanism;
the fuzzy self-adapting mechanism is a processing module with two inputs and one output, the two inputs are respectively the estimated compensation output and the deviation of the controlled object, and the change rate of the deviation, and the output is a time variable.
While steps S201-S205 are being performed, steps S206-S210 are being performed,
s206: collecting the original backwater temperature on a backwater main pipe;
s207: converting the original return water temperature into return water temperature deviation received by a water pump system, and calculating the deviation change rate of the return water temperature deviation;
s208: taking the return water temperature deviation and the temperature difference change rate as input signals and calculating through fuzzy PID control;
s209: carrying out pre-estimation compensation processing to obtain a backwater temperature signal for eliminating hysteresis influence;
s210: filtering the backwater temperature signal with the hysteresis influence eliminated to obtain effective backwater temperature T2;
further, the filtering the backwater temperature signal from which the hysteresis influence is eliminated includes:
filtering the backwater temperature signal without the hysteresis influence by using a transfer function;
wherein the transfer function is a function containing a time variable, the time variable being determined by a fuzzy adaptive mechanism;
the fuzzy self-adapting mechanism is a processing module with two inputs and one output, the two inputs are respectively the estimated compensation output and the deviation of the controlled object, and the change rate of the deviation, and the output is a time variable.
S211: judging whether the absolute value of the difference value of the effective water supply temperature and the effective water return temperature is greater than a preset temperature value (for example, 5 ℃);
s212: when the absolute value of the difference is larger than the preset temperature value, reducing the frequency of the secondary pump;
s213: when the absolute value of the difference is not greater than a preset temperature value, judging that the absolute value of the difference between the effective water supply temperature and the effective water return temperature is equal to the preset temperature value;
s214: when the absolute value of the difference value is equal to the preset temperature value, keeping the frequency of the secondary pump unchanged;
s215: and when the absolute value of the difference is smaller than the preset temperature value, increasing the frequency of the secondary pump.
According to the control method, the hysteresis of the acquired original water supply temperature and the original water return temperature is eliminated, and the frequency of the secondary pump is adjusted by utilizing the difference value of the water supply temperature and the water return temperature with the hysteresis eliminated so as to control the water outlet flow, so that the phenomenon of 'over-regulation' is avoided, the stability of the water pump system is improved, and the energy efficiency of the water pump system is also improved.
FIG. 3 is a schematic structural diagram of a control device of a chilled water secondary pump according to an embodiment of the invention.
As shown in fig. 3, the control device for a chilled water secondary pump according to the present embodiment includes:
the temperature acquisition module 1 is used for respectively acquiring the original water supply temperature on the water supply main pipe and the original water return temperature on the water return main pipe;
the processing module 2 is used for respectively processing the original water supply temperature and the original water return temperature to obtain an effective water supply temperature and an effective water return temperature;
and the adjusting module 3 is used for adjusting the frequency of the secondary pump according to the effective water supply temperature and the effective water return temperature so as to control the water outlet flow.
In this embodiment the processing module adopts intelligent processing module, intelligent processing module can eliminate temperature "hysteresis" problem, avoids "overshoot" phenomenon, improves water pump system stability, and it is extravagant to reduce the energy consumption. The intelligent processing module is shown in fig. 4.
Fig. 4 is a schematic diagram of a fuzzy Smith intelligent control structure, which introduces a Smith estimation control algorithm and includes a Smith estimator. The feedback link and the compensation link are added, and the hysteresis transfer function disappears in the closed loop transfer function through calculation and is not influenced by the hysteresis time constant. The Smith predictor is connected in parallel to the main controller instead of the controlled object. Fig. 4 also includes a transfer function 1/(tfs +1) in the feedback path, which is equivalent to a filtering element, so that the output is not directly fed back to the controller, but passes through the filtering element. And (3) adapting to the variation of the deviation by adjusting the value of tfs in real time, wherein the deviation is subjected to filtering processing. The time variable tfs contained in the transfer function is determined by the fuzzy adaptive mechanism. Establishing a fuzzy rule table according to the practice and experience; the fuzzy self-adapting mechanism is a module with two inputs and one output, wherein the inputs are the output of the predictor and the deviation te of the controlled object respectively, and the output is the time variable tfs, and the deviation change rate tec is the output of the predictor and the time variable tfs. The time variable output by the fuzzy self-adapting mechanism is transmitted to the transfer function, thereby adjusting the filtering effect of the transfer function on the controlled signal.
The control device of this embodiment in the in-service use, gather the water main temperature to change water supply temperature deviation and the water supply temperature deviation rate of change that water pump system accepted, through fuzzy control calculation, the parameter of output is through the compensation link of modified predictor after PID calculates, eliminates the hysteresis influence, and after the transfer function that obtains through adaptive mechanism calculation carries out filtering, returns required value as effective water supply temperature. Wherein,
and collecting the temperature of the return water main pipe, and obtaining the effective return water temperature through the steps. Comparing the difference value of the effective water supply temperature and the effective backwater temperature, adopting a constant temperature difference mode (for example: 5 ℃), and adjusting the frequency of the secondary pump to control the water outlet flow.
The control device of the embodiment eliminates the hysteresis of the acquired original water supply temperature and the original water return temperature through the processing module 2, and then adjusts the frequency of the secondary pump by the adjusting module 3 by utilizing the difference value of the acquired water supply temperature and the acquired water return temperature to control the water outlet flow, so that the phenomenon of 'over-regulation' is avoided, the stability of the water pump system is improved, and the energy efficiency of the water pump system is also improved.
The invention also provides a controller for executing the control method of the chilled water secondary pump in the figure 1 or the figure 2.
The present invention also provides a water pump system, comprising: the control device of the chilled water secondary pump is shown in figure 3.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that the terms "first," "second," and the like in the description of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present invention, the meaning of "a plurality" means at least two unless otherwise specified.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A control method of a chilled water secondary pump is characterized by comprising the following steps:
respectively collecting original water supply temperature on a water supply main pipe and original water return temperature on a water return main pipe;
respectively processing the original water supply temperature and the original water return temperature to obtain an effective water supply temperature and an effective water return temperature;
and adjusting the frequency of a secondary pump according to the effective water supply temperature and the effective water return temperature so as to control the water outlet flow.
2. The control method of claim 1, wherein processing the raw feed water temperature to obtain an effective feed water temperature comprises:
converting the original water supply temperature into water supply temperature deviation received by a water pump system, and calculating the deviation change rate of the water supply temperature deviation;
after the water supply temperature deviation and the temperature difference change rate are used as input signals and are subjected to fuzzy PID control calculation, pre-estimation compensation processing is carried out, and a water supply temperature signal with hysteresis influence eliminated is obtained;
and filtering the water supply temperature signal with the hysteresis influence eliminated to obtain the effective water supply temperature.
3. The control method according to claim 2, wherein the filtering the lag-eliminated supply water temperature signal includes:
filtering the water supply temperature signal with the hysteresis influence eliminated by using a transfer function;
wherein the transfer function is a function containing a time variable, the time variable being determined by a fuzzy adaptive mechanism;
the fuzzy self-adapting mechanism is a processing module with two inputs and one output, the two inputs are respectively the estimated compensation output and the deviation of the controlled object, and the change rate of the deviation, and the output is a time variable.
4. The control method according to claim 1, wherein the processing the original return water temperature to obtain an effective return water temperature comprises:
converting the original return water temperature into return water temperature deviation received by a water pump system, and calculating the deviation change rate of the return water temperature deviation;
after the return water temperature deviation and the temperature difference change rate are used as input signals and are subjected to fuzzy PID control calculation, pre-estimation compensation processing is carried out, and a return water temperature signal with hysteresis influence eliminated is obtained;
and filtering the backwater temperature signal without the hysteresis influence to obtain the effective backwater temperature.
5. The control method according to claim 4, wherein the filtering the backwater temperature signal for eliminating the hysteresis influence comprises:
filtering the backwater temperature signal without the hysteresis influence by using a transfer function;
wherein the transfer function is a function containing a time variable, the time variable being determined by a fuzzy adaptive mechanism;
the fuzzy self-adapting mechanism is a processing module with two inputs and one output, the two inputs are respectively the estimated compensation output and the deviation of the controlled object, and the change rate of the deviation, and the output is a time variable.
6. The control method according to any one of claims 1 to 5, wherein the adjusting the frequency of the secondary pump according to the effective supply water temperature and the effective return water temperature comprises:
calculating the difference value between the effective water supply temperature and the effective water return temperature;
and adjusting the frequency of the secondary pump according to the difference value.
7. The control method of claim 6, wherein said adjusting the frequency of the secondary pump based on said difference comprises:
when the absolute value of the difference is larger than the preset temperature value, reducing the frequency of the secondary pump;
when the absolute value of the difference is smaller than the preset temperature value, increasing the frequency of the secondary pump;
when the absolute value of the difference is equal to the preset temperature value, the frequency of the secondary pump is kept unchanged.
8. A control device of a chilled water secondary pump is characterized by comprising:
the temperature acquisition module is used for respectively acquiring the original water supply temperature on the water supply main pipe and the original water return temperature on the water return main pipe;
the processing module is used for respectively processing the original water supply temperature and the original water return temperature to obtain an effective water supply temperature and an effective water return temperature;
and the adjusting module is used for adjusting the frequency of the secondary pump according to the effective water supply temperature and the effective water return temperature so as to control the water outlet flow.
9. A controller for performing the method of controlling the secondary pump of chilled water according to any one of claims 1 to 7.
10. A water pump system, comprising: control device for a chilled water secondary pump according to claim 8.
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Application publication date: 20210416 |