CN102383466B - High-efficiency cluster type water pump system with constant pressure and variable flow and operation control method - Google Patents
High-efficiency cluster type water pump system with constant pressure and variable flow and operation control method Download PDFInfo
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- CN102383466B CN102383466B CN201110354792.9A CN201110354792A CN102383466B CN 102383466 B CN102383466 B CN 102383466B CN 201110354792 A CN201110354792 A CN 201110354792A CN 102383466 B CN102383466 B CN 102383466B
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Abstract
The invention discloses a high-efficiency cluster type water pump system with constant pressure and variable flow and an operation control method. According to the high-efficiency cluster type water pump system, a water pump can be reasonably configured according to the constant pressure and water consumption continuous change rule of industrial and mining enterprises. The high-efficiency cluster type water pump system comprises a plurality of water pumps, a full-voltage bus, two frequency converting buses, two frequency converters and a plurality of normally-opened alternating current contactors, wherein one water pump is a speed regulating pump and other water pumps are constant speed pumps; each water pump is provided with a driving motor; the driving motors are divided into a group I and a group II; each driving motor in two groups is connected with the full-voltage bus, a frequency converting bus I and a frequency converting bus II through contacts of the two alternating current contactors; a frequency converter I and a frequency converter II are respectively connected between the full-voltage bus and the frequency converting bus II as between the frequency converting bus I and the frequency converting bus II through contacts of another two alternating current contactors; and one residual contact of the alternating current contactor is connected between the two frequency converting buses. The control process comprises a start process of the water pumps, the speed regulating operation process of a variable speed pump, a flexible switching process of the water pumps and the speed regulating operation process of the variable speed pump after the flexible switching process is ended.
Description
Technical field
The present invention relates to high-efficiency cluster type water pump system and the progress control method of the fixed-voltage altering-current amount of water system, more particularly, according to the demand of industrial and mining enterprises' fixed-voltage altering-current amount, reasonable disposition constant speed pump, speed-variable pump and frequency converter also build cluster type water pump, guarantee every water pump under different operation conditions all in high efficiency section running status.
Background technology
At present, some industrial and mining enterprises' water supply volumes alter a great deal, and traditional manual manipulation mode is difficult to meet water requirements, often there is insufficient water or the phenomenon of metalling run out, so not only cause water resource waste, simultaneously because pump is often in poor efficiency district, often cause again wasting of electric energy.For complicated supply and drain water system, pertinent literature discloses by many water pumps and many team control water pump systems that frequency converter forms, pump group switching mode is realized position formula according to water demand and is controlled, this control method is simple, and can solve water resource waste problem, improved to a certain extent system effectiveness, but also there are the following problems: the configuration of (1) water pump is owed rationally, still have space energy-conservation very greatly and that raise the efficiency simultaneously; (2) whole system configuration frequency converter is more, and frequency converter price is high, and one-time investment is large, and whole system cost performance is low; (3) pump group adopts hard switching mode, easily causes water hammer effect, to pipe-line system, brings great destructiveness.
Summary of the invention
The present invention is directed to deficiency and defect that existing water pump allocation plan exists, provide a kind of according to operating mode enterprise constant voltage, the continuous Changing Pattern of water supply volume and high-efficiency cluster type water pump system and the progress control method of the number of units of reasonable disposition water pump, frequency converter and A.C. contactor and the fixed-voltage altering-current amount of nominal parameter.
Technical solution of the present invention is:
A kind of high-efficiency cluster type water pump system of fixed-voltage altering-current amount, comprise many water pumps, total head bus, frequency conversion bus I, frequency conversion bus II, with the capacity of separate unit water pump, configure frequency converter and a plurality of A.C. contactor open in usual of two coupling capacity, its special character is: wherein a water pump is governor impeller, all the other are constant speed pump, a drive motor of every water pump configuration, described drive motor is divided into two groups of I, II, number of units=2 of described A.C. contactor * water pump number of units+3, every drive motor in first group of I is connected with frequency conversion bus I with total head bus by the contact of two A.C. contactors respectively, every drive motor in second group of II is connected with frequency conversion bus II with total head bus by the contact of two A.C. contactors respectively, frequency converter I, frequency converter II is connected between total head bus and frequency conversion bus I and between total head bus and frequency conversion bus II by the contact of other two A.C. contactors respectively, the contact of last A.C. contactor is connected between frequency conversion bus I and frequency conversion bus II.
Above-mentioned water pump number of units is determined in accordance with the following methods:
1) first determine the operation condition of user's request, comprise lift, maximum stream flow and minimum discharge;
2) using operating mode minimum discharge and the lift demand metered flow Q as separate unit water pump
nwith rated head H
n, then by the efficiency eta of actual pump
nselect rated shaft power parameter P
n=ρ gQ
nh
n/ (3600 η
n), ρ is fluid density, unit is Kg/m
3, g is acceleration of gravity, unit is meter per second square;
3) configuration water pump number of units
With maximum stream flow, configure the number of units of water pump, water pump number of units=[metered flow of maximum stream flow/separate unit water pump], [] is expressed as and gets maximum integer.
A progress control method for fixed-voltage altering-current amount high-efficiency cluster type water pump system, its special character is:
(1) starting mode of pump process
According to the metered flow Q of the demand Q of user's water supply volume and separate unit water pump
ndetermine the number of units m=[Q/Q of water pump to be moved
n], [] represents to get maximum integer, when m is even number, two groups of number of units n1=n2=m/2 that water pump is to be moved, if when m is odd number, two groups of water pump number of units to be moved are respectively n1=(m+1)/2, n2=(m-1)/2, according to the number of times of each starting mode of pump in every group, determine and start priority, fewer its priority of the number of starts is higher, and more its priority of the number of starts is lower, and each group is according to the numbering that starts priority and determine water pump to be started, if system is moved first or priority level is identical, adopt the way of randomly drawing to determine the numbering that starts water pump, running status by upper computer detection frequency converter, if two frequency converters are all normal, frequency converter I, II is simultaneously to I, II group treats that actuating motor starts one by one according to ascending numbered packets, if frequency converter I is normal, frequency converter II is undesired, adopt frequency converter I to start one by one according to ascending numbered packets two groups of motor, if frequency converter I is undesired, frequency converter II is normal, adopt frequency converter II to start one by one according to ascending numbered packets two groups of motor, during startup, make the ac contactor contact closure being connected with frequency conversion bus accordingly, if frequency converter I, II are all undesired, do not start water pump, to host computer, report to the police simultaneously, starting mode of pump process finishes, and control system is carried out speed-variable pump speed governing operation process,
(2) starting mode of pump process finishes rear speed-variable pump speed governing operation process
When two cover frequency converters are all normal, select at random a frequency converter as work frequency converter, another is as standby variable frequency device; When one, two cover frequency converter normal one when undesired, selecting normal frequency converter is work frequency converter, the last water pump starting of work frequency converter is just as governor impeller, and the ac contactor contact that the ac contactor contact being connected with frequency conversion bus corresponding to other water pump disconnects, is connected with total head bus is closed, make other water pumps as constant speed pump; By reference flow and actual flow calculated flow rate error e q, when eq is non-vanishing, work frequency converter carries out speed governing to governor impeller, until eq equals zero;
(3) the flexible switching process of water pump
When user's water supply volume changes, cause required water pump number of units to change, namely Δ ≠ 0, carries out the flexible switching of water pump, otherwise keeps original state, flexible switching process is: when number of units increases, Δ >0, is first converted to constant speed pump by the ac contactor contact closure being connected with total head bus by original governor impeller, when Δ is even number, two groups of number of units Δ 1=Δ 2=Δ/2 that water pump is to be dropped into, when if Δ is odd number, two groups of water pump number of units to be dropped into are respectively Δ 1=(Δ+1)/2, Δ 2=(Δ-1)/2, and each group determines according to described startup priority the water pump numbering that each group is to be dropped into, by upper computer detection frequency converter I, the running status of II, if frequency converter I, II is all normal, frequency converter I, II simultaneously to in two groups, start one by one according to the sequential packet of ascending numbering with motor corresponding to water pump to be dropped into, if frequency converter I is normal, frequency converter II is undesired, adopt frequency converter I and make to be connected on the motor corresponding with water pump to be dropped in two groups of two ac contactor contact closed pairs between frequency conversion bus and start one by one according to the sequential packet of ascending numbering, if frequency converter I is undesired, frequency converter II is normal, adopt frequency converter II and make to be connected on the motor corresponding with water pump to be dropped in two groups of two ac contactor contact closed pairs between frequency conversion bus and start one by one according to the sequential packet of ascending numbering, if I, II frequency converter is all undesired, do not start water pump, to host computer, report to the police simultaneously, when number of units reduces, be Δ <0, first by the ac contactor contact closure being connected with total head bus, original governor impeller is converted to constant speed pump, when | Δ | during for even number, two groups of number of units Δ 1=Δ 2=| Δs that water pump is to cut out |/2, if | Δ | during for odd number, two groups of water pump number of units to be closed are respectively Δ 1=(| Δ |+1)/2, Δ 2=(| Δ |-1)/2, and each group determines according to the order contrary with described startup priority the numbering that each group is to be switched off the pump, running status by upper computer detection frequency converter, if two frequency converters are all normal, frequency converter I, II is simultaneously to I, in II group, close one by one according to the sequential packet of ascending numbering with the corresponding motor of waiting to switch off the pump, if frequency converter I is normal, frequency converter II is undesired, adopt frequency converter I to closing one by one according to the sequential packet of ascending numbering with the corresponding motor of waiting to switch off the pump in two groups, if frequency converter I is undesired, frequency converter II is normal, adopt frequency converter II to closing one by one according to the sequential packet of ascending numbering with the corresponding motor of waiting to switch off the pump in two groups, if frequency converter I, II is all undesired, do not switch off the pump, to host computer, report to the police simultaneously,
(4) flexible switching process finishes rear speed-variable pump speed governing operation process
Host computer is carried out speed-variable pump speed governing operation, when frequency converter I, II are all normal, the work that the is chosen as frequency converter that work times is few, work times many as standby variable frequency device, when one, two cover frequency converter normal one when undesired, selecting normal frequency converter is work frequency converter, the last water pump starting of work frequency converter is just as governor impeller, and the ac contactor contact that the ac contactor contact being connected with frequency conversion bus corresponding to other water pump disconnects, is connected with total head bus is closed, make other water pumps as constant speed pump; By reference flow and actual flow calculated flow rate error e q, when eq is non-vanishing, work frequency converter carries out speed governing to governor impeller, until eq equals zero.
The invention has the beneficial effects as follows: with the water pump of many low capacity same model, replace a large capacity water pump, changes in flow rate rule for fixed-voltage altering-current amount water system, according to workload demand flexible dispatching water pump, combine, reasonable disposition water pump, builds cluster type water pump system with frequency converter and A.C. contactor.Compare with traditional water pump group control system, the water pump of all operations of this scheme all works in high efficiency section, and whole efficiency is high, and energy-saving effect is remarkable; Adopt two cover frequency converters, wherein a frequency converter is as speed governing use, and another is compared with traditional single frequency converter allocation plan as standby, and this scheme is more reliable; During water pump switching, two cover frequency converters coordinate the water hammer effect of more easily avoiding flow sudden change and bringing, and realize flexible switching; Two cover frequency converters can start water pump as starting equipment, have replaced soft initiator, can save hardware investment; In addition, two cover frequency converters can start for two groups of drive motors simultaneously, greatly shorten the starting time, have improved operational efficiency, and have reached most economical effect.
Accompanying drawing explanation
Fig. 1 is the cluster water pump system structure chart the present invention relates to;
Fig. 2 is starting mode of pump control flow chart of the present invention;
Fig. 3 is governor impeller running-course control flow chart of the present invention;
Fig. 4 is the flexible switching control flow chart of water pump of the present invention.
The specific embodiment
As shown in Figure 1, the cluster type water pump system the present invention relates to, comprises many water pumps 1 that carry out serial number, and every water pump connects respectively control valve 2, and described water pump number of units is determined in accordance with the following methods:
1) first determine the operation condition of user's request, comprise lift, maximum stream flow and minimum discharge; With lift H=250m, maximum stream flow Qmax=550m
3/ hour, minimum discharge Qmin=150 m
3/ hour be example.
2) using operating mode minimum discharge and the lift demand metered flow Q as separate unit water pump 1
nwith rated head H
n, then by the efficiency eta of actual pump
nselect specified rated shaft power parameter P
n=ρ gQ
nh
n/ (3600 η
n), ρ is fluid density, unit is Kg/m
3, g is acceleration of gravity, unit is meter per second square; With Q
n=150 m
3/ hour, H
n=250m, the rated efficiency of water pump is η
n=0.74 is example, and the rated shaft power of water pump is P
n=ρ gQ
nh
n/ (3600 η
n)=140Kw.
3) number of units of configuration water pump
With maximum stream flow, configure the number of units of water pump 1, the metered flow of number of units N=[maximum stream flow/separate unit water pump of water pump 1], [] is expressed as and gets maximum integer, during work 1 as governor impeller, other water pump is as constant speed pump.
A drive motor of every water pump 1 configuration, is divided into two groups of I, II the drive motor of water pump 1 correspondence simultaneously, the frequency converter that configures two coupling capacity with separate unit water pump capacity, is respectively frequency converter I 7, frequency converter II 8, be equipped with 1 of total head bus, 2 of frequency conversion buses, with the capacity of separate unit water pump, configure again the A.C. contactor open in usual of a plurality of coupling capacity, number of units=2 of A.C. contactor * water pump number of units+3, wherein every the drive motor 3 in first group of I is connected with frequency conversion bus I 5 with total head bus 4 by the constant open contact of two A.C. contactors respectively, every drive motor in second group of II is connected with frequency conversion bus II 6 with total head bus 4 by the normal contact of two A.C. contactors respectively, frequency converter I 7, frequency converter II 8 is connected on total head bus 4 by the constant open contact of another two A.C. contactors respectively, between frequency conversion bus I 5 and total head bus 4, between frequency conversion bus II 6, the constant open contact of a remaining A.C. contactor is connected on frequency conversion bus I 5, between frequency conversion bus II 6, by 3 pairs of frequency converter I 7 of upper device, frequency converter II 8, whether be that normal condition detects and the duty of A.C. contactor is controlled.
In the present embodiment, water pump 1 is six, number order is No. 1 pump～No. 6 pump, drive motor is M1～M6 and is divided into two groups of I, II, first group is drive motor M1～M3, second group is drive motor M4～M6, number of units=15 of A.C. contactor, are respectively A.C. contactor KM1～KM3, KM11～KM16, KM21～KM26, frequency converter I 7, the end of incoming cables of frequency converter II 8 is respectively by A.C. contactor KM1, the constant open contact of KM2 is connected on total head bus 4, frequency converter I 7, the leading-out terminal of frequency converter II 8 is connected to frequency conversion bus I 5, in frequency conversion bus II 6, two frequency conversion bus I 5, frequency conversion bus II 6 connects by the constant open contact of A.C. contactor KM3 again, first group of motor M1～M3 is by A.C. contactor KM11～KM12, KM13～KM14, the constant open contact of KM15～KM16 is connected with total head bus 4 with frequency conversion bus I 5, second group of motor M4, M5, M6 is by A.C. contactor KM21～KM22, KM23～KM24, KM25～KM26 is connected with total head bus 4 with frequency conversion bus II 6.
Operation control procedure is as follows:
(1) starting mode of pump process
As shown in Figure 2, according to the metered flow Q of the demand Q of user's water supply volume and separate unit water pump 1
ndetermine the number of units m=[Q/Q of water pump to be moved
n], [] represents to get maximum integer.When m is even number, two groups of number of units n1=n2=m/2 that water pump is to be moved; When if m is odd number, two groups of water pump number of units to be moved are respectively n1=(m+1)/2, n2=(m-1)/2; According to the number of times that each water pump 1 starts in every group, determine and start priority, fewer its priority of the number of starts is higher, and more its priority of the number of starts is lower, and each group is according to the numbering that starts priority and determine each group water pump 1 to be started; If system is moved first or priority level is identical, adopt the way of randomly drawing to determine the numbering that starts water pump 1; The running status that is detected frequency converter I, II by host computer 3, if two frequency converters are all normal, frequency converter I 7, frequency converter II 8 treat that to I, II group actuating motor starts one by one according to the sequential packet of ascending numbering simultaneously; If frequency converter I 7 is normal, frequency converter II 8 is undesired, adopts 7 pairs of two groups of motor of frequency converter I to start one by one according to the sequential packet of ascending numbering; If frequency converter I 7 is undesired, frequency converter II 8 is normal, adopt 8 pairs of two groups of motor of frequency converter II to start one by one according to the sequential packet of ascending numbering, during startup, make the ac contactor contact closure being connected with frequency conversion bus accordingly, after startup, from reservoir, draw water for user; If frequency converter I, II are all undesired, do not start water pump, to host computer 3, report to the police simultaneously.
In the present embodiment, having four water pumps needs to start, and first group starts priority and be from high to low: No. 3 water pump-No. 1 water pumps, second group starts priority and be from high to low: No. 4 water pump-No. 5 water pumps, frequency converter I 7, frequency converter II 8 are all normal.During startup, frequency converter I 7 will start before and after No. 1 water pump, No. 3 water pumps in first group, frequency converter II 8 will start before and after No. 4 water pumps and No. 5 water pumps (if frequency converter I 7 is normal, frequency converter II 8 is undesired, by frequency converter I 7, will in I group, before and after No. 1 water pump, No. 3 water pumps, be started, and then will in II group, before and after No. 4 water pumps and No. 5 water pumps, start).
(2) speed-variable pump speed governing operation process after starting mode of pump
As shown in Figure 3, when frequency converter I, II are all normal, select at random a frequency converter as work frequency converter, another is as standby variable frequency device; When one, two cover frequency converter normal one when undesired, selecting normal frequency converter is work frequency converter, the last water pump starting of work frequency converter is just as governor impeller, and the ac contactor contact that the ac contactor contact being connected with frequency conversion bus corresponding to other water pump disconnects, is connected with total head bus is closed, make other water pumps as constant speed pump; By host computer 3, by reference flow and actual flow calculated flow rate error e q, when eq is non-vanishing, work frequency converter carries out speed governing to governor impeller, until eq equals zero;
In conjunction with the present embodiment, frequency converter I is as work frequency converter, No. 3 water pump is governor impeller, A.C. contactor KM11, the KM21 corresponding with No. 1 water pump, No. 4 water pumps and No. 5 water pumps and the constant open contact of KM23 disconnect and the constant open contact of A.C. contactor KM12, KM22 and KM24 is closed, make No. 1 water pump, No. 4 water pumps and No. 5 water pumps as constant speed pump.
(3) the flexible switching process of water pump
As shown in Figure 4, when user's water supply volume changes, cause the number of units of required water pump 1 to change, namely Δ ≠ 0, carries out the flexible switching of water pump, otherwise keeps original state, flexible switching process is: when number of units increases, be Δ >0, first the constant open contact by the A.C. contactor that is connected with total head bus 4 is converted to constant speed pump by original governor impeller, when Δ is even number, two groups of number of units Δ 1=Δ 2=Δ/2 that water pump is to be dropped into, when if Δ is odd number, two groups of water pump number of units to be dropped into are respectively Δ 1=(Δ+1)/2, Δ 2=(Δ-1)/2, and each group determines according to startup priority the water pump numbering that each group is to be dropped into, by host computer 3, detect frequency converter I, the running status of II, if two frequency converters are all normal, frequency converter I, II is simultaneously to I, motor corresponding with water pump to be dropped in II group starts one by one according to the sequential packet of ascending numbering, if frequency converter I 7 is normal, frequency converter II 8 is undesired, adopt the motor corresponding with water pump to be dropped in 7 pairs two groups of frequency converter I to start one by one according to the sequential packet of ascending numbering, if frequency converter I 7 is undesired, frequency converter II 8 is normal, adopt the motor corresponding with water pump to be dropped in 8 pairs two groups of frequency converter II to start one by one according to the sequential packet of ascending numbering, if frequency converter I, II is all undesired, do not start water pump, to host computer 3, report to the police simultaneously.When water pump number of units reduces, be Δ <0, first the constant open contact by the A.C. contactor that is connected with total head bus 4 is converted to constant speed pump by original governor impeller, when | Δ | during for even number, two groups of number of units Δ 1=Δ 2=| Δs that water pump is to cut out |/2, if | Δ | during for odd number, two groups of water pump number of units to be closed are respectively Δ 1=(| Δ |+1)/2, Δ 2=(| Δ |-1)/2, each group determines according to the order contrary with starting priority the numbering that each group is to be switched off the pump, by host computer 3, detect frequency converter I, the running status of II, if two frequency converters are all normal, frequency converter I 7, frequency converter II 8 is simultaneously to I, II group is closed according to the sequential packet of descending numbering one by one with the corresponding motor of waiting to switch off the pump, if frequency converter I 7 is normal, frequency converter II 8 is undesired, adopt in 7 pairs two groups of frequency converter I with the corresponding motor of waiting to switch off the pump and close one by one according to the sequential packet of descending numbering, if frequency converter I 7 is undesired, frequency converter II 8 is normal, adopt in 8 pairs two groups of frequency converter II with the corresponding motor of waiting to switch off the pump and close one by one according to the sequential packet of descending numbering, if frequency converter I, II is all undesired, do not switch off the pump, to host computer 3, report to the police simultaneously.
In conjunction with the present embodiment, when number of units increases by two, first by the constant open contact closure of A.C. contactor KM15 disconnection, A.C. contactor KM16 is converted to constant speed pump by No. 3 water pumps, each group determines that according to starting priority water pump to be dropped into is numbered No. 2 water pumps, No. 6 water pumps, in 8 pairs of II groups of motor M2, frequency converter II that in 7 pairs of I groups of frequency converter I, No. 2 water pumps are corresponding, No. 6 motor M6 corresponding to water pump divide into groups to start, and during startup, by host computer 3, make constant open contact KM13, KM25 closed.If frequency converter I 7 is normal, frequency converter II 8 is undesired, by host computer 3, make constant open contact KM3 closed, in 7 pairs of I groups of frequency converter I in the motor M2 corresponding with No. 2 water pumps, II group with motor M6 corresponding to No. 6 water pumps startup of divide into groups.
(4) flexible switching process finishes rear speed-variable pump speed governing operation process
In the present embodiment, frequency converter I, II are all normal, and frequency converter II work times is chosen as work frequency converter less, and frequency converter I is as standby variable frequency device.
Claims (3)
1. the high-efficiency cluster type water pump system of a fixed-voltage altering-current amount, comprise many water pumps, total head bus, frequency conversion bus I, frequency conversion bus II, two frequency converters and a plurality of A.C. contactor open in usual, it is characterized in that: wherein a water pump is governor impeller, all the other are constant speed pump, a drive motor of every water pump configuration, described drive motor is divided into two groups of I, II, number of units=2 of described A.C. contactor * water pump number of units+3, every drive motor in first group of I is connected with frequency conversion bus I with total head bus by the contact of two A.C. contactors respectively, every drive motor in second group of II is connected with frequency conversion bus II with total head bus by the contact of two A.C. contactors respectively, frequency converter I, frequency converter II is connected between total head bus and frequency conversion bus I and between total head bus and frequency conversion bus II by the contact of other two A.C. contactors respectively, the contact of last A.C. contactor is connected between frequency conversion bus I and frequency conversion bus II.
2. the high-efficiency cluster type water pump system of fixed-voltage altering-current amount according to claim 1, is characterized in that: described water pump number of units is determined in accordance with the following methods:
(1) first determine the operation condition of user's request, comprise lift, maximum stream flow and minimum discharge;
(2) using operating mode minimum discharge and the lift demand metered flow Q as separate unit water pump
nwith rated head H
n, then by the efficiency eta of actual pump
nselect rated shaft power parameter P
n=ρ gQ
nh
n/ (3600 η
n), ρ is fluid density, unit is Kg/m
3, g is acceleration of gravity, unit is meter per second square;
(3) configure water pump number of units, with maximum stream flow, configure the number of units of water pump, water pump number of units=[metered flow of maximum stream flow/separate unit water pump], [] is expressed as and gets maximum integer.
3. the progress control method of fixed-voltage altering-current amount high-efficiency cluster type water pump system as claimed in claim 1, is characterized in that:
(1) starting mode of pump process
According to the metered flow Q of the demand Q of user's water supply volume and separate unit water pump
ndetermine the number of units m=[Q/Q of water pump to be moved
n], [] represents to get maximum integer, when m is even number, two groups of number of units n1=n2=m/2 that water pump is to be moved, if when m is odd number, two groups of water pump number of units to be moved are respectively n1=(m+1)/2, n2=(m-1)/2, according to the number of times of each starting mode of pump in every group, determine and start priority, fewer its priority of the number of starts is higher, and more its priority of the number of starts is lower, and each group is according to the numbering that starts priority and determine water pump to be started, if system is moved first or priority level is identical, adopt the way of randomly drawing to determine the numbering that starts water pump, running status by upper computer detection frequency converter, if two frequency converters are all normal, frequency converter I, II is simultaneously to I, II group treats that actuating motor starts one by one according to ascending numbered packets, if frequency converter I is normal, frequency converter II is undesired, adopt frequency converter I to start one by one according to ascending numbered packets two groups of motor, if frequency converter I is undesired, frequency converter II is normal, adopt frequency converter II to start one by one according to ascending numbered packets two groups of motor, during startup, make the ac contactor contact closure being connected with frequency conversion bus accordingly, if frequency converter I, II are all undesired, do not start water pump, to host computer, report to the police simultaneously, starting mode of pump process finishes, and control system is carried out speed-variable pump speed governing operation process,
(2) starting mode of pump process finishes rear speed-variable pump speed governing operation process
When two frequency converters are all normal, select at random a frequency converter as work frequency converter, another is as standby variable frequency device; When one, two frequency converters normal one when undesired, selecting normal frequency converter is work frequency converter, the last water pump starting of work frequency converter is just as governor impeller, and the ac contactor contact that the ac contactor contact being connected with frequency conversion bus corresponding to other water pump disconnects, is connected with total head bus is closed, make other water pumps as constant speed pump; By reference flow and actual flow calculated flow rate error e q, when eq is non-vanishing, work frequency converter carries out speed governing to governor impeller, until eq equals zero;
(3) the flexible switching process of water pump
When changing, user's water supply volume cause required water pump number of units to change, Δ ≠ 0 namely, and the water pump number of units of Δ for increasing or reducing, carries out the flexible switching of water pump, otherwise keeps original state, flexible switching process is: when number of units increases, Δ >0, is first converted to constant speed pump by the ac contactor contact closure being connected with total head bus by original governor impeller, when Δ is even number, two groups of number of units Δ 1=Δ 2=Δ/2 that water pump is to be dropped into, when if Δ is odd number, two groups of water pump number of units to be dropped into are respectively Δ 1=(Δ+1)/2, Δ 2=(Δ-1)/2, and each group determines according to described startup priority the water pump numbering that each group is to be dropped into, by upper computer detection frequency converter I, the running status of II, if frequency converter I, II is all normal, frequency converter I, II is simultaneously to I, motor corresponding with water pump to be dropped in II group starts one by one according to the sequential packet of ascending numbering, if frequency converter I is normal, frequency converter II is undesired, adopt frequency converter I and make to be connected on the motor corresponding with water pump to be dropped in two groups of two ac contactor contact closed pairs between frequency conversion bus and start one by one according to the sequential packet of ascending numbering, if frequency converter I is undesired, frequency converter II is normal, adopt frequency converter II and make to be connected on the motor corresponding with water pump to be dropped in two groups of two ac contactor contact closed pairs between frequency conversion bus and start one by one according to the sequential packet of ascending numbering, if frequency converter I, II is all undesired, do not start water pump, to host computer, report to the police simultaneously, when number of units reduces, be Δ <0, first by the ac contactor contact closure being connected with total head bus, original governor impeller is converted to constant speed pump, when | Δ | during for even number, two groups of number of units Δ 1=Δ 2=| Δs that water pump is to cut out |/2, if | Δ | during for odd number, two groups of water pump number of units to be closed are respectively Δ 1=(| Δ |+1)/2, Δ 2=(| Δ |-1)/2, and each group determines according to the order contrary with described startup priority the numbering that each group is to be switched off the pump, running status by upper computer detection frequency converter, if two frequency converters are all normal, frequency converter I, II is simultaneously to I, in II group, close one by one by the sequential packet of ascending numbering with the corresponding motor of waiting to switch off the pump, if frequency converter I is normal, frequency converter II is undesired, adopt frequency converter I to closing one by one according to the sequential packet of ascending numbering with the corresponding motor of waiting to switch off the pump in two groups, if frequency converter I is undesired, frequency converter II is normal, adopt frequency converter II to closing one by one according to the sequential packet of ascending numbering with the corresponding motor of waiting to switch off the pump in two groups, if frequency converter I, II is all undesired, do not switch off the pump, to host computer, report to the police simultaneously,
(4) flexible switching process finishes rear speed-variable pump speed governing operation process
Host computer is carried out speed-variable pump speed governing operation, when frequency converter I, II are all normal, the work that the is chosen as frequency converter that work times is few, work times many as standby variable frequency device, when one, two frequency converters normal one when undesired, selecting normal frequency converter is work frequency converter, the last water pump starting of work frequency converter is just as governor impeller, and the ac contactor contact that the ac contactor contact being connected with frequency conversion bus corresponding to other water pump disconnects, is connected with total head bus is closed, make other water pumps as constant speed pump; By reference flow and actual flow calculated flow rate error e q, when eq is non-vanishing, work frequency converter carries out speed governing to governor impeller, until eq equals zero.
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| CN102705216B (en) * | 2012-06-29 | 2015-06-24 | 广西佛泵科技有限公司 | Switching method and equipment for high-pressure water supply pumps |
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| CN103603409B (en) * | 2013-12-03 | 2015-01-07 | 中国农业大学 | Method for stopping pumps in well cluster water supply system by means of cooperated action of pumps and flow regulating valve |
| CN104595168A (en) * | 2014-12-03 | 2015-05-06 | 安徽士华机电设备科技有限公司 | Method for controlling water pump frequency conversion based on tail end constant impedance |
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| CN110821805A (en) * | 2019-11-01 | 2020-02-21 | 神华粤电珠海港煤炭码头有限责任公司 | Water pump for water supply adjusting station |
| CN110912190B (en) * | 2019-12-03 | 2022-03-04 | 国网冀北电力有限公司电力科学研究院 | Black start method and device for pumped storage power station |
| CN113653133B (en) * | 2021-06-30 | 2023-04-07 | 广州文冲船舶修造有限公司 | Water supply monitoring system |
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| CN1030539C (en) * | 1990-08-23 | 1995-12-20 | 南通市节约用水办公室 | Programmable regulating device of deep-well pumping water-supply system |
| CN1216793A (en) * | 1997-10-30 | 1999-05-19 | 赵虎哲 | Variable-frequency, speed-regulation and constant pressure water supply equipment and method for high buildings |
| ES1063841Y (en) * | 2006-09-01 | 2007-03-16 | Aigeltec Ingenieria S L | CONTROL EQUIPMENT FOR A PRESSURE GROUP |
| CN201204559Y (en) * | 2008-04-14 | 2009-03-04 | 中国洛阳浮法玻璃集团有限责任公司 | Constant-pressure closed-loop frequency conversion water supply controller |
| CN201756720U (en) * | 2010-07-01 | 2011-03-09 | 江苏旷达汽车织物集团股份有限公司 | Variable-frequency constant-pressure water supply system |
| CN202298755U (en) * | 2011-11-10 | 2012-07-04 | 渤海大学 | Efficient cluster water pump system for constant-voltage converting quantities |
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