CN105133699A - Water supply pump frequency-variable control method and system - Google Patents
Water supply pump frequency-variable control method and system Download PDFInfo
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- CN105133699A CN105133699A CN201510548469.3A CN201510548469A CN105133699A CN 105133699 A CN105133699 A CN 105133699A CN 201510548469 A CN201510548469 A CN 201510548469A CN 105133699 A CN105133699 A CN 105133699A
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Abstract
The invention discloses a water supply pump frequency-variable control method and system. By controlling a water pump connected with a power supply output end of a frequency converter to conduct normal water supply and conduct increase, decrease, dormancy and dormancy awakening control on the water pump in different judgment processes through the frequency converter when a received running command is effective, the water pump can be controlled without the cooperation with an additional water pump controller, and the problems that in the prior art, due to the fact that the water supply function can be achieved by using the frequency converter and the additional water pump controller in cooperation, cost and failure maintenance points are increased are solved.
Description
Technical field
The present invention relates to converter technology field, particularly relate to a kind of water supply pump method for controlling frequency conversion and system.
Background technology
For the position be above the ground level, such as office building or residential building, there is a demand for water supply function, and tap water is often stored in ground, this just needs the supercharging realizing piped water by controlling the running of water pump by water system, tap water is transported to building high level along pipe laying, high-level user water demand could be met like this.
Modern building water system generally adopts frequency conversion speed-adjusting system, and can control water pump soft start, and can realize constant pressure water supply by frequency conversion stepless time adjustment, and meanwhile, energy-saving efficiency is high.
But at present, a lot of building water management system all adopts water pump controller (as programmable logic controller system) and frequency converter jointly to come, and adds cost, too increases Breakdown Maintenance point simultaneously.
Summary of the invention
In view of this, the invention provides a kind of water supply pump method for controlling frequency conversion and system, need extra water pump controller to coordinate frequency converter jointly to realize the problem of water supply function to solve prior art.
A kind of water supply pump method for controlling frequency conversion, be applied to frequency converter, described water supply pump method for controlling frequency conversion comprises:
In the effective situation of action command received, the water pump controlling to be connected with the power output end of described frequency converter carries out normal water supply;
Judge whether the quantity running water pump is greater than one; When the quantity judging to run water pump is greater than one, judging whether to meet increases the pre-conditioned of water pump, if meet the pre-conditioned of described increase water pump, controls an off-duty water pump and puts into operation; And judge whether to meet the pre-conditioned of minimizing water pump, reduce the pre-conditioned of water pump if meet, control an operating water pump out of service;
When the quantity judging to run water pump is one, judge whether to meet the pre-conditioned of described increase water pump, if meet the pre-conditioned of described increase water pump, then control an off-duty water pump and put into operation; And judge whether to meet the pre-conditioned of dormancy, if meet the pre-conditioned of described dormancy, then enter water supply resting state; When being in water supply resting state, judge whether to meet the pre-conditioned of dormancy awakening, if meet the pre-conditioned of described dormancy awakening, then enter water supply dormancy awakening state, the water pump controlling to be connected with the power output end of described frequency converter enters the state of normal water supply.
Preferably, described normal water supply state is: carry out PID control according to the hydraulic pressure desired value preset and actual hydraulic pressure detected value, by controlling the running frequency of the water pump be connected with the power output end of described frequency converter, control the difference of described actual hydraulic pressure detected value and described default hydraulic pressure desired value within the scope of allowable error.
Preferably, described in judge whether to meet and increase water pump pre-conditioned, if meet the pre-conditioned of described increase water pump, control the step that an off-duty water pump puts into operation and comprise:
Judge whether the running frequency of the water pump be connected with the power output end of described frequency converter is more than or equal to the first predeterminated frequency;
When judging that the running frequency of water pump be connected with the power output end of described frequency converter is more than or equal to described first predeterminated frequency, judge whether the duration that described running frequency is more than or equal to described first predeterminated frequency is more than or equal to the first Preset Time;
When the duration judging that described running frequency is more than or equal to described first predeterminated frequency is more than or equal to described first Preset Time, judge whether described actual hydraulic pressure detected value is less than described default hydraulic pressure desired value, and the difference of described default hydraulic pressure desired value and described actual hydraulic pressure detected value is greater than the first preset difference value;
When judging that described actual hydraulic pressure detected value is less than described default hydraulic pressure desired value; and the difference of described default hydraulic pressure desired value and described actual hydraulic pressure detected value is when being greater than described first preset difference value; to shut down and the water pump that the power output end controlling current and described frequency converter is connected switches to and is connected with common frequency power network; control a water pump do not put into operation to be connected with the power output end of described frequency converter; restart, enter the state of normal water supply.
Preferably, described in judge whether to meet and reduce water pump pre-conditioned, if meet the pre-conditioned of described minimizing water pump, the step controlling operating water pump out of service comprises:
Judge whether the running frequency of the water pump be connected with the power output end of described frequency converter is less than or equal to the second predeterminated frequency;
When judging that described running frequency is less than or equal to described second predeterminated frequency, judge whether the duration that described running frequency is less than or equal to described second predeterminated frequency is more than or equal to the second Preset Time;
When the duration judging that described running frequency is less than or equal to described second predeterminated frequency is more than or equal to described second Preset Time, judge whether described actual hydraulic pressure detected value is greater than described default hydraulic pressure desired value, and the difference of described default hydraulic pressure desired value and described actual hydraulic pressure detected value is greater than the second preset difference value;
When judging that described actual hydraulic pressure detected value is greater than described default hydraulic pressure desired value, and the difference of described default hydraulic pressure desired value and described actual hydraulic pressure detected value is when being greater than described second preset difference value, of controlling in the current water pump be connected with common frequency power network disconnects the connection with described common frequency power network.
Preferably, described in judge whether to meet the pre-conditioned of dormancy, if meet the pre-conditioned of described dormancy, then the step entering water supply resting state comprises:
Judge whether the running frequency of the water pump be connected with the power output end of described frequency converter is less than or equal to the 3rd predeterminated frequency;
When judging that described running frequency is less than or equal to described 3rd predeterminated frequency, judge whether the duration that described running frequency is less than or equal to described 3rd predeterminated frequency is more than or equal to the 3rd Preset Time;
When the duration judging that described running frequency is less than or equal to described 3rd predeterminated frequency is more than or equal to described 3rd Preset Time, replaces described default hydraulic pressure desired value with the second larger predetermined target value, carry out PID control with described actual hydraulic pressure detected value;
By controlling described running frequency in described 3rd Preset Time, control the difference of described actual hydraulic pressure detected value and described second predetermined target value within the scope of described allowable error, or after exceeding described 3rd Preset Time, speed reducing stopping.
Preferably, described judging whether meets the pre-conditioned of dormancy awakening, if meet the pre-conditioned of described dormancy awakening, then enter water supply dormancy awakening state, the step that the water pump controlling to be connected with the power output end of described frequency converter enters the state of normal water supply comprises:
Judge whether described actual hydraulic pressure detected value is less than described default hydraulic pressure desired value, and the difference of described default hydraulic pressure desired value and described actual hydraulic pressure detected value is greater than the 3rd preset difference value;
When judging that described actual hydraulic pressure detected value is less than described default hydraulic pressure desired value, and the difference of described default hydraulic pressure desired value and described actual hydraulic pressure detected value is when being greater than described 3rd preset difference value, judge whether the duration that the difference of described default hydraulic pressure desired value and described actual hydraulic pressure detected value is greater than described 3rd preset difference value is more than or equal to the 4th Preset Time;
When the duration judging that the difference of described default hydraulic pressure desired value and described actual hydraulic pressure detected value is greater than described 3rd preset difference value is more than or equal to described 4th Preset Time, the water pump that the power output end controlling current and described frequency converter is connected runs for lower frequency limit with the 4th predeterminated frequency, enters the state of normal water supply.
Preferably, also comprise: when judgement does not meet the pre-conditioned of described increase water pump, when also not meeting described minimizing water pump pre-conditioned, the water pump controlling to be connected with the power output end of described frequency converter enters the state of normal water supply.
Preferably, also comprise: when judgement does not meet the pre-conditioned of described dormancy, or when not meeting described increase water pump pre-conditioned, the water pump controlling to be connected with the power output end of described frequency converter enters the state of normal water supply.
Preferably, also comprising: when not receiving action command, to shut down and to control water pump out of service.
A kind of water supply pump frequency-changing control system, it is characterized in that, comprise frequency converter, the power input of described frequency converter is connected with common frequency power network, the signal input part of described frequency converter is connected with device for detecting water pressure, the power output end of described frequency converter is connected with water pump, and described frequency converter is for performing above-mentioned arbitrary described water supply pump method for controlling frequency conversion.
Water supply pump method for controlling frequency conversion disclosed by the invention, by frequency converter in the effective situation of action command received, the water pump controlling to be connected with the power output end of described frequency converter carries out normal water supply, and realize the increase of water pump, minimizing, dormancy and dormancy awakening are controlled through different deterministic processes, without the need to the cooperation of extra water pump controller, the control for water pump can being realized, avoiding the increase problem of cost that prior art brings because needing extra water pump controller to coordinate frequency converter jointly to realize water supply function and Breakdown Maintenance point.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The schematic flow sheet of Fig. 1 water supply pump method for controlling frequency conversion disclosed in the embodiment of the present invention;
The schematic flow sheet of water pump is increased in Fig. 2 water supply pump method for controlling frequency conversion disclosed in another embodiment of the present invention;
The schematic flow sheet of water pump is reduced in Fig. 3 water supply pump method for controlling frequency conversion disclosed in another embodiment of the present invention;
The schematic flow sheet of water supply dormancy is entered in Fig. 4 water supply pump method for controlling frequency conversion disclosed in another embodiment of the present invention;
The schematic flow sheet of dormancy awakening is entered in Fig. 5 water supply pump method for controlling frequency conversion disclosed in another embodiment of the present invention;
The structural representation of Fig. 6 water supply pump frequency-changing control system disclosed in another embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
The invention provides a kind of water supply pump method for controlling frequency conversion and system, need extra water pump controller to coordinate frequency converter jointly to realize the problem of water supply function to solve prior art.
Concrete, described water supply pump method for controlling frequency conversion, as shown in Figure 1, comprising:
S100, reception action command, judge that whether described action command is effective;
S200, when judging that described action command is effective, controlling the water pump that is connected with the power output end of described frequency converter and carrying out normal water supply;
S300, judge whether run the quantity of water pump is greater than one;
The water pump that described Frequency Converter Control is connected with self carries out normal water supply, and can also there is at least one water pump be connected with common frequency power network is in running status simultaneously.The water pump such as run is altogether three, and wherein two water pumps be connected with described common frequency power network are in running status, and a water pump is connected with described frequency converter and is in normal water supply state; The operation of described two water pumps be now connected with described common frequency power network does not make pipeline hydraulic pressure reach demand, carries out hydraulic pressure and supplements, make it to satisfy the demands by the water pump be connected with described frequency converter.
When the quantity judging to run water pump is greater than one, performs step S401, judge whether to meet the pre-conditioned of increase water pump; With step S402, judge whether to meet and reduce the pre-conditioned of water pump;
When in building, user's water supply volume is large especially, pipeline hydraulic pressure is decayed very fast, and pipeline hydraulic pressure possibly cannot be stabilized in requirements by existing operation water pump, then need to increase water pump quantity.
If user's water supply volume is very little in building, then the pipeline hydraulic pressure after the supercharging of existing operation water pump may exceed requirements.And pipeline hydraulic pressure is too high large to pipe loss, affect the supply equipment life-span, now, need to reduce and run water pump.
S403, when judge to meet increase water pump pre-conditioned time, control an off-duty water pump and put into operation;
S404, when judge to meet reduce water pump pre-conditioned time, then control an operating water pump out of service;
Preferably, when judge to increase water pump and reduce water pump pre-conditioned all do not meet time, perform step S200;
When judging that running the quantity of water pump is one, perform step S401, and S501, judge whether to meet the pre-conditioned of dormancy;
The quantity running water pump is one, illustrates that the water pump now run is only one that is connected with described frequency converter.If now user's water supply volume is very little in building, then run without the need to described water pump always, enter water supply resting state, can realize energy-conservation.
S502, when judging to meet dormancy pre-conditioned, enter water supply resting state;
S503, when being in water supply resting state, judge whether to meet the pre-conditioned of dormancy awakening;
S504, when judging to meet dormancy awakening pre-conditioned, entering water supply dormancy awakening state, performing step S200;
When judging not meet dormancy awakening pre-conditioned, described frequency converter can keep water supply resting state always;
Preferably, when the condition of the pre-conditioned and described increase water pump judging described dormancy does not all meet, perform step S200.
Preferably, do not receiving in the effective situation of action command, to shut down and to control water pump out of service.
Water supply pump method for controlling frequency conversion disclosed in the present embodiment, by frequency converter in the effective situation of action command received, the water pump controlling to be connected with the power output end of described frequency converter carries out normal water supply, and realize the increase of water pump, minimizing, dormancy and dormancy awakening are controlled through different deterministic processes, without the need to the cooperation of extra water pump controller, the control for water pump can being realized, avoiding the increase problem of cost that prior art brings because needing extra water pump controller to coordinate frequency converter jointly to realize water supply function and Breakdown Maintenance point.
Preferably, described normal water supply state is: carry out PID control according to the hydraulic pressure desired value preset and actual hydraulic pressure detected value, by controlling the running frequency of the water pump be connected with the power output end of described frequency converter, control the difference of described actual hydraulic pressure detected value and described default hydraulic pressure desired value within the scope of allowable error.
In concrete practical application, described default hydraulic pressure desired value in ordinarily resident building can get 0.6MPa, now described allowable error can control setting according to different PID and get 0.01 or 0.02MPa, is not specifically limited, depending on the applied environment that it is concrete herein.
Preferably, as shown in Figure 2, step S401 comprises:
Whether the running frequency of the water pump that S601, judgement are connected with the power output end of described frequency converter is more than or equal to the first predeterminated frequency;
S602, when judging that the running frequency of water pump be connected with the power output end of described frequency converter is more than or equal to described first predeterminated frequency, judge whether the duration that described running frequency is more than or equal to described first predeterminated frequency is more than or equal to the first Preset Time;
S603, when the duration judging that described running frequency is more than or equal to described first predeterminated frequency is more than or equal to described first Preset Time, judge whether described actual hydraulic pressure detected value is less than described default hydraulic pressure desired value, and the difference of described default hydraulic pressure desired value and described actual hydraulic pressure detected value is greater than the first preset difference value;
When judging that described actual hydraulic pressure detected value is less than described default hydraulic pressure desired value; and the difference of described default hydraulic pressure desired value and described actual hydraulic pressure detected value is when being greater than described first preset difference value; perform step S403; specifically comprise: to shut down and the water pump that the power output end controlling current and described frequency converter is connected switches to and is connected with common frequency power network; control a water pump do not put into operation to be connected with the power output end of described frequency converter; restart, enter the state of normal water supply.
In concrete practical application, if NO, the judged result of description of step S401 is no to the judged result of step S601, S602 and S603, then will enter step S200.
Because user's water supply volume in building is in constantly change, if user's water supply volume is large especially, then pipeline hydraulic pressure is decayed very fast, and piped water supercharging may be stabilized in described default hydraulic pressure desired value by existing operation water pump.Now then need to increase water pump, if water pump operation frequency is more than or equal to described first predeterminated frequency, and described first Preset Time of continuous service, pipeline hydraulic pressure still cannot arrive described default hydraulic pressure desired value, and the difference of pipeline hydraulic pressure and target hydraulic pressure is greater than described first preset difference value, then need to perform step S403.Now; described frequency converter is first shut down, and (now described frequency converter stops output voltage feed pump; but other modules of described frequency converter still can chargedly work on); then the water pump that the power output end controlling current and described frequency converter is connected switches to and is connected with common frequency power network; control a water pump do not put into operation to be connected with the power output end of described frequency converter; restart that (now described frequency converter restarts output voltage feed pump, enters the state of normal water supply.
Described first Preset Time in the present embodiment, described first preset difference value, described first predeterminated frequency and described default hydraulic pressure desired value all can set according to actual conditions, are not specifically limited herein.
What deserves to be explained is; in actual applications; described frequency converter also can control a water pump do not put into operation after shutting down and is directly connected with described common frequency power network and then puts into operation, and the water pump that the power output end controlling current and described frequency converter is connected restarts to enter the state of normal water supply with certain predeterminated frequency.But the mode of this increase water pump, fails to take into account the frequency of utilization of all water pumps.And the mode of above-mentioned increase water pump is more preferred, the application life of each water pump can be extended.
Preferably, as shown in Figure 3, step S402 comprises:
Whether the running frequency of the water pump that S701, judgement are connected with the power output end of described frequency converter is less than or equal to the second predeterminated frequency;
S702, when judging that described running frequency is less than or equal to described second predeterminated frequency, judge whether the duration that described running frequency is less than or equal to described second predeterminated frequency is more than or equal to the second Preset Time;
S703, when the duration judging that described running frequency is less than or equal to described second predeterminated frequency is more than or equal to described second Preset Time, judge whether described actual hydraulic pressure detected value is greater than described default hydraulic pressure desired value, and the difference of described default hydraulic pressure desired value and described actual hydraulic pressure detected value is greater than the second preset difference value;
When judging that described actual hydraulic pressure detected value is greater than described default hydraulic pressure desired value, and the difference of described default hydraulic pressure desired value and described actual hydraulic pressure detected value is when being greater than described second preset difference value, perform step S404, specifically comprise: of controlling in the current water pump be connected with common frequency power network disconnects the connection with described common frequency power network.
In concrete practical application, the judged result of step S701, S702 and S703 if NO, all will turn back in the state of normal water supply.
If user's water supply volume is very little, pipeline hydraulic pressure then after the supercharging of existing operation water pump may exceed described default hydraulic pressure desired value, pipeline hydraulic pressure is too high large to pipe loss, affect the supply equipment life-span, now, need to reduce and run water pump, directly can deduct a water pump be connected with described common frequency power network from existing operation water pump, the i.e. direct connection breaking a water pump from described common frequency power network, the water pump controlling subsequently to be connected with the power output end of described frequency converter carries out normal water supply.
Described second Preset Time in the present embodiment, described second preset difference value, described second predeterminated frequency and described default hydraulic pressure desired value all can set according to actual conditions, are not specifically limited herein.
Preferably, as shown in Figure 4, step S501 comprises:
Whether the running frequency of the water pump that S801, judgement are connected with the power output end of described frequency converter is less than or equal to the 3rd predeterminated frequency;
S802, when judging that described running frequency is less than or equal to described 3rd predeterminated frequency, judge whether the duration that described running frequency is less than or equal to described 3rd predeterminated frequency is more than or equal to the 3rd Preset Time;
When the duration judging that described running frequency is less than or equal to described 3rd predeterminated frequency is more than or equal to described 3rd Preset Time, performs step S502, specifically comprise:
S803, replace described default hydraulic pressure desired value with larger second predetermined target value, carry out PID control with described actual hydraulic pressure detected value;
S804, judge to control the time that described actual hydraulic pressure detected value rises and whether be less than the 3rd Preset Time;
S805, when judging that the described rise time is less than described 3rd Preset Time, judge that the difference of described actual hydraulic pressure detected value and described second predetermined target value is whether within the scope of described allowable error;
S806, when judging that the difference of described actual hydraulic pressure detected value and described second predetermined target value is within the scope of described allowable error; or when judging that the described rise time is more than or equal to described 3rd Preset Time; (now described frequency converter stops output voltage feed pump to speed reducing stopping; but other modules of described frequency converter still can chargedly work on), enter water supply resting state.
When judging that the described rise time is less than described 3rd Preset Time, and the difference of described actual hydraulic pressure detected value and described second predetermined target value is greater than when exceeding described allowable error scope, continues to carry out PID control according to described second predetermined target value and described actual hydraulic pressure detected value.
Enter dormancy standby before, by replacing described default hydraulic pressure desired value with larger second predetermined target value, carrying out hydraulic pressure lifting, can dormancy time be increased, and then can energy-saving efficiency be improved.
In concrete practical application, the judged result of step S801 and S802 if NO, all will turn back in the state of normal water supply.
Described 3rd Preset Time in the present embodiment, described 3rd predeterminated frequency, described default hydraulic pressure desired value and described second predetermined target value all can set according to actual conditions, are not specifically limited herein.
Preferably, as shown in Figure 5, step S503 comprises:
S901, judge whether described actual hydraulic pressure detected value is less than described default hydraulic pressure desired value, and the difference of described default hydraulic pressure desired value and described actual hydraulic pressure detected value is greater than the 3rd preset difference value;
S902, when judging that described actual hydraulic pressure detected value is less than described default hydraulic pressure desired value, and the difference of described default hydraulic pressure desired value and described actual hydraulic pressure detected value is when being greater than described 3rd preset difference value, judge whether the duration that the difference of described default hydraulic pressure desired value and described actual hydraulic pressure detected value is greater than described 3rd preset difference value is more than or equal to the 4th Preset Time;
When the duration judging that the difference of described default hydraulic pressure desired value and described actual hydraulic pressure detected value is greater than described 3rd preset difference value is more than or equal to described 4th Preset Time, perform step S504, specifically comprise: the water pump that the power output end controlling current and described frequency converter is connected runs for lower frequency limit with the 4th predeterminated frequency, enters the state of normal water supply.
In dormancy standby, user's water supply volume is change, if user's water supply volume increases, now, pipeline hydraulic pressure can be decayed quickening, when detecting that pipeline hydraulic pressure (described actual hydraulic pressure detected value) continues the 4th Preset Time and is less than described default hydraulic pressure desired value, and the difference of pipeline hydraulic pressure and target hydraulic pressure is greater than described 3rd preset difference value, then need to enter dormancy awakening state, the water pump that the power output end that now can control current and described frequency converter is connected with described 4th predeterminated frequency for lower frequency limit runs, the state entering normal water supply (carries out PID control according to the hydraulic pressure desired value preset and actual hydraulic pressure detected value, by controlling the running frequency of the water pump be connected with the power output end of described frequency converter, control the difference of described actual hydraulic pressure detected value and described default hydraulic pressure desired value within the scope of described allowable error).Avoid the start-up course slowly risen from low frequency, accelerate to enter normal water supply state procedure.
In concrete practical application, the judged result of step S901 and S902 if NO, all will turn back in the state of water supply dormancy.
Described 3rd preset difference value in the present embodiment, described 4th Preset Time, the described default hydraulic pressure desired value of described 4th predeterminated frequency level all can set according to actual conditions, are not specifically limited herein.
Another embodiment of the present invention additionally provides a kind of water supply pump frequency-changing control system, as shown in Figure 6, comprise frequency converter 101, the power input of frequency converter 101 is connected with common frequency power network, the signal input part of frequency converter 101 is connected with device for detecting water pressure, the power output end of frequency converter 101 is connected with water pump, and frequency converter 101 is for the arbitrary described water supply pump method for controlling frequency conversion of above-described embodiment.
In concrete practical application, the signal output part of frequency converter 101 can be connected with the control end of multiple SP3T switch by a relay, control each described SP3T switch to select to be connected with described common frequency power network, or be connected with the power output end of frequency converter 101, or unsettled (not all being connected with the power output end of described common frequency power network with frequency converter 101).
The described actual hydraulic pressure detected value (from described device for detecting water pressure) of frequency converter 101 by receiving, PID control is carried out with described default hydraulic pressure desired value (can be given from the hydraulic pressure of outside in actual application), by the frequency that the frequency inverted of the common frequency power network of reception is suitable, export the water pump be attached thereto to, control it by each pipeline for each building life pipe network carries out normal water supply.
In addition, frequency converter 101, also by the determining step shown in Fig. 2 or Fig. 3, controls water pump and is connected with self or is connected with described common frequency power network, and then the control realizing water pump increase or reduce.Or by the determining step shown in Fig. 4, the water pump controlling to be connected with self enters water supply resting state, and before entering dormancy and be standby, by replacing described default hydraulic pressure desired value with the second larger predetermined target value, carry out hydraulic pressure lifting, can dormancy time be increased, and then can energy-saving efficiency be improved.And frequency converter 101 is also by the determining step shown in Fig. 5, the water pump controlling to be connected with self enters dormancy awakening state, the water pump that the power output end that specifically can control current and described frequency converter is connected with described 4th predeterminated frequency for lower frequency limit runs, the state entering normal water supply (carries out PID control according to the hydraulic pressure desired value preset and actual hydraulic pressure detected value, by controlling the running frequency of the water pump be connected with the power output end of described frequency converter, control the difference of described actual hydraulic pressure detected value and described default hydraulic pressure desired value within the scope of described allowable error).Avoid the start-up course slowly risen from low frequency, accelerate to enter normal water supply state procedure.
Concrete operating principle is same as the previously described embodiments, repeats no more herein.
In this manual, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a water supply pump method for controlling frequency conversion, is characterized in that, is applied to frequency converter, and described water supply pump method for controlling frequency conversion comprises:
In the effective situation of action command received, the water pump controlling to be connected with the power output end of described frequency converter carries out normal water supply;
Judge whether the quantity running water pump is greater than one; When the quantity judging to run water pump is greater than one, judging whether to meet increases the pre-conditioned of water pump, if meet the pre-conditioned of described increase water pump, controls an off-duty water pump and puts into operation; And judge whether to meet the pre-conditioned of minimizing water pump, reduce the pre-conditioned of water pump if meet, control an operating water pump out of service;
When the quantity judging to run water pump is one, judge whether to meet the pre-conditioned of described increase water pump, if meet the pre-conditioned of described increase water pump, then control an off-duty water pump and put into operation; And judge whether to meet the pre-conditioned of dormancy, if meet the pre-conditioned of described dormancy, then enter water supply resting state; When being in water supply resting state, judge whether to meet the pre-conditioned of dormancy awakening, if meet the pre-conditioned of described dormancy awakening, then enter water supply dormancy awakening state, the water pump controlling to be connected with the power output end of described frequency converter enters the state of normal water supply.
2. water supply pump method for controlling frequency conversion according to claim 1, it is characterized in that, described normal water supply state is: carry out PID control according to the hydraulic pressure desired value preset and actual hydraulic pressure detected value, by controlling the running frequency of the water pump be connected with the power output end of described frequency converter, control the difference of described actual hydraulic pressure detected value and described default hydraulic pressure desired value within the scope of allowable error.
3. water supply pump method for controlling frequency conversion according to claim 2, is characterized in that, described in judge whether to meet and increase water pump pre-conditioned, if meet the pre-conditioned of described increase water pump, control the step that an off-duty water pump puts into operation and comprise:
Judge whether the running frequency of the water pump be connected with the power output end of described frequency converter is more than or equal to the first predeterminated frequency;
When judging that the running frequency of water pump be connected with the power output end of described frequency converter is more than or equal to described first predeterminated frequency, judge whether the duration that described running frequency is more than or equal to described first predeterminated frequency is more than or equal to the first Preset Time;
When the duration judging that described running frequency is more than or equal to described first predeterminated frequency is more than or equal to described first Preset Time, judge whether described actual hydraulic pressure detected value is less than described default hydraulic pressure desired value, and the difference of described default hydraulic pressure desired value and described actual hydraulic pressure detected value is greater than the first preset difference value;
When judging that described actual hydraulic pressure detected value is less than described default hydraulic pressure desired value; and the difference of described default hydraulic pressure desired value and described actual hydraulic pressure detected value is when being greater than described first preset difference value; to shut down and the water pump that the power output end controlling current and described frequency converter is connected switches to and is connected with common frequency power network; control a water pump do not put into operation to be connected with the power output end of described frequency converter; restart, enter the state of normal water supply.
4. water supply pump method for controlling frequency conversion according to claim 2, is characterized in that, described in judge whether to meet and reduce water pump pre-conditioned, if meet the pre-conditioned of described minimizing water pump, the step controlling operating water pump out of service comprises:
Judge whether the running frequency of the water pump be connected with the power output end of described frequency converter is less than or equal to the second predeterminated frequency;
When judging that described running frequency is less than or equal to described second predeterminated frequency, judge whether the duration that described running frequency is less than or equal to described second predeterminated frequency is more than or equal to the second Preset Time;
When the duration judging that described running frequency is less than or equal to described second predeterminated frequency is more than or equal to described second Preset Time, judge whether described actual hydraulic pressure detected value is greater than described default hydraulic pressure desired value, and the difference of described default hydraulic pressure desired value and described actual hydraulic pressure detected value is greater than the second preset difference value;
When judging that described actual hydraulic pressure detected value is greater than described default hydraulic pressure desired value, and the difference of described default hydraulic pressure desired value and described actual hydraulic pressure detected value is when being greater than described second preset difference value, of controlling in the current water pump be connected with common frequency power network disconnects the connection with described common frequency power network.
5. water supply pump method for controlling frequency conversion according to claim 2, is characterized in that, described in judge whether to meet the pre-conditioned of dormancy, if meet the pre-conditioned of described dormancy, then the step entering water supply resting state comprises:
Judge whether the running frequency of the water pump be connected with the power output end of described frequency converter is less than or equal to the 3rd predeterminated frequency;
When judging that described running frequency is less than or equal to described 3rd predeterminated frequency, judge whether the duration that described running frequency is less than or equal to described 3rd predeterminated frequency is more than or equal to the 3rd Preset Time;
When the duration judging that described running frequency is less than or equal to described 3rd predeterminated frequency is more than or equal to described 3rd Preset Time, replaces described default hydraulic pressure desired value with the second larger predetermined target value, carry out PID control with described actual hydraulic pressure detected value;
By controlling described running frequency in described 3rd Preset Time, control the difference of described actual hydraulic pressure detected value and described second predetermined target value within the scope of described allowable error, or after exceeding described 3rd Preset Time, speed reducing stopping.
6. water supply pump method for controlling frequency conversion according to claim 2, it is characterized in that, described judging whether meets the pre-conditioned of dormancy awakening, if meet the pre-conditioned of described dormancy awakening, then enter water supply dormancy awakening state, the step that the water pump controlling to be connected with the power output end of described frequency converter enters the state of normal water supply comprises:
Judge whether described actual hydraulic pressure detected value is less than described default hydraulic pressure desired value, and the difference of described default hydraulic pressure desired value and described actual hydraulic pressure detected value is greater than the 3rd preset difference value;
When judging that described actual hydraulic pressure detected value is less than described default hydraulic pressure desired value, and the difference of described default hydraulic pressure desired value and described actual hydraulic pressure detected value is when being greater than described 3rd preset difference value, judge whether the duration that the difference of described default hydraulic pressure desired value and described actual hydraulic pressure detected value is greater than described 3rd preset difference value is more than or equal to the 4th Preset Time;
When the duration judging that the difference of described default hydraulic pressure desired value and described actual hydraulic pressure detected value is greater than described 3rd preset difference value is more than or equal to described 4th Preset Time, the water pump that the power output end controlling current and described frequency converter is connected runs for lower frequency limit with the 4th predeterminated frequency, enters the state of normal water supply.
7. water supply pump method for controlling frequency conversion according to claim 1, it is characterized in that, also comprise: when judgement does not meet the pre-conditioned of described increase water pump, when also not meeting described minimizing water pump pre-conditioned, the water pump controlling to be connected with the power output end of described frequency converter enters the state of normal water supply.
8. water supply pump method for controlling frequency conversion according to claim 1, it is characterized in that, also comprise: when judgement does not meet the pre-conditioned of described dormancy, or when not meeting described increase water pump pre-conditioned, the water pump controlling to be connected with the power output end of described frequency converter enters the state of normal water supply.
9. water supply pump method for controlling frequency conversion according to claim 1, is characterized in that, also comprise: when not receiving action command, shuts down and to control water pump out of service.
10. a water supply pump frequency-changing control system, it is characterized in that, comprise frequency converter, the power input of described frequency converter is connected with common frequency power network, the signal input part of described frequency converter is connected with device for detecting water pressure, the power output end of described frequency converter is connected with water pump, and described frequency converter is used for enforcement of rights and requires 1 to 9 arbitrary described water supply pump method for controlling frequency conversion.
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| CN201510548469.3A CN105133699A (en) | 2015-08-31 | 2015-08-31 | Water supply pump frequency-variable control method and system |
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| CN201510548469.3A CN105133699A (en) | 2015-08-31 | 2015-08-31 | Water supply pump frequency-variable control method and system |
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| CN201510548469.3A Pending CN105133699A (en) | 2015-08-31 | 2015-08-31 | Water supply pump frequency-variable control method and system |
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