CN106194684A

CN106194684A - A kind of water system control method and device

Info

Publication number: CN106194684A
Application number: CN201610594121.2A
Authority: CN
Inventors: 宋志春; 杨建文; 王亚静
Original assignee: POLYTRON TECHNOLOGIES Inc
Current assignee: Langfang new Olympic pan Energy Network Technology Service Co., Ltd.
Priority date: 2016-07-26
Filing date: 2016-07-26
Publication date: 2016-12-07
Anticipated expiration: 2036-07-26
Also published as: CN106194684B

Abstract

The present embodiments relate to the energy and field of energy-saving technology, particularly relate to a kind of water system control method and device, for saving the energy of water system, in the embodiment of the present invention, obtain the traffic demand amount that one group of parallel-connected pumps in water intake system next cycle need to meet；Be optimized computing according to traffic demand amount and constraints, determine that meet constraints and make to need in this group parallel-connected pumps of next cycle the general power of in running order pump reach minimum under conditions of in this group parallel-connected pumps of next cycle, need in running order pump；And need in running order pump in this group parallel-connected pumps of next cycle existence variable frequency pump time, determine the operational factor needing in running order each variable frequency pump in this group parallel-connected pumps of next cycle；Constraints at least includes that in this group parallel-connected pumps of next cycle, the flow summation of the pump that all need are in running order meets traffic demand amount.

Description

A kind of water system control method and device

Technical field

The present embodiments relate to the energy and field of energy-saving technology, particularly relate to a kind of water system control method and device.

Background technology

Water system suffers from important function in multiple fields, the water system in such as central air conditioner system, deposits in water system At multiple pumps.Owing to must design by the situation that load is maximum when design, and it is also contemplated that safety coefficient, so practical situation On, the water system overwhelming majority time in air-conditioning does not operate under full load condition, adds up according to relevant departments, central air-conditioning system System has the time of about 80% to be operate in below 75% underload.Present case is, the water system of most of central air-conditioning System all uses constant flow water system, often occurs the situation that the water yield is excessive when underload, causes the waste of energy greatly.

Along with energy shortage and global resources bone are guarded against, and country is to energy-conservation attention, it is provided that a kind of water system controlling party Case, for saving the energy in water system, becomes extremely urgent problem.

Summary of the invention

The embodiment of the present invention provides a kind of water system control method and device, for saving the energy of water system.

The embodiment of the present invention provides a kind of water system control method, it is adaptable to include the water system of least one set parallel-connected pumps, For often organizing parallel-connected pumps, the method includes:

Obtain the traffic demand amount that one group of parallel-connected pumps in water intake system next cycle need to meet；

According to traffic demand amount and constraints, it is optimized computing, determines that meet constraints and make next This group parallel-connected pumps of cycle needs the general power of in running order pump reach minimum under conditions of:

In running order pump is needed in this group parallel-connected pumps of next cycle；And need in this group parallel-connected pumps of next cycle During existence variable frequency pump in running order pump, determine this group parallel-connected pumps of next cycle needs in running order every The operational factor of individual variable frequency pump；

Wherein, constraints at least includes: the stream of the pump that all need are in running order in this group parallel-connected pumps of next cycle Amount summation meets traffic demand amount.

Alternatively, after obtaining the traffic demand amount that one group of parallel-connected pumps in water intake system next cycle need to meet, it is optimized Before computing, also include:

According to the pipe system performance curve of water system, and traffic demand amount, determine the lift demand of outlet system；

According to lift demand, determine the flow when meeting lift demand of the general pump in this group parallel-connected pumps；

According to the systematic parameter of each variable frequency pump in lift demand, this group parallel-connected pumps, and each variable frequency pump preset Efficiency threshold, determine the flow rate zone of variable frequency pump in this group parallel-connected pumps；

Constraints also includes:

When needing that in running order pump exists variable frequency pump in this group parallel-connected pumps of next cycle, in this group of next cycle The flow needing in running order each variable frequency pump in parallel-connected pumps is in the flow rate zone that this variable frequency pump is corresponding；

When needing that in running order pump exists general pump in this group parallel-connected pumps of next cycle, in this group of next cycle Flow when to need the flow of in running order each general pump in parallel-connected pumps be to meet lift demand.

Alternatively, according to the systematic parameter of each variable frequency pump in lift demand, this group parallel-connected pumps, and the frequency conversion preset The efficiency of pump is interval, determines the flow rate zone of variable frequency pump in this group parallel-connected pumps, including:

For each variable frequency pump in this group parallel-connected pumps, perform:

According to the systematic parameter of this variable frequency pump obtained, determine the performance curve of this variable frequency pump；

According to the performance curve of this variable frequency pump, determine that the initial flow of this variable frequency pump is interval, wherein, this variable frequency pump Flow value when being positioned at initial flow interval, the work efficiency of this variable frequency pump is not less than the efficiency threshold of this variable frequency pump；

According to lift demand, determine the flow value that this variable frequency pump is corresponding when meeting lift demand, determine flow When value is more than the peak flow values that initial flow is interval, by the interval between minimum stream value in initial flow interval to flow value It is defined as the flow rate zone of this pump；

According to lift demand, determine the flow value that this variable frequency pump is corresponding when meeting lift demand, determine flow During the value minimum stream value interval less than initial flow, by interval between peak flow values in flow value to initial flow interval It is defined as the flow rate zone of this pump；

According to lift demand, determine the flow value that this variable frequency pump is corresponding when meeting lift demand, determine flow Value is not more than the peak flow values that initial flow is interval, and during not less than the minimum stream value that initial flow is interval, by initial flow Amount interval is defined as the flow rate zone of this pump.

Alternatively, obtain the traffic demand amount that one group of parallel-connected pumps in water intake system next cycle need to meet, including:

Obtain the initial flow demand of this group parallel-connected pumps in water intake system next cycle；

When determining initial flow demand less than the minimum flow threshold value of the main frame of water system, minimum flow threshold value is set It is set to traffic demand amount；

When determining initial flow demand more than the maximum flow threshold value of the main frame of water system, maximum flow threshold value is set It is set to traffic demand amount；

Determining that initial flow demand is not less than the minimum flow threshold value of the main frame of water system and no more than water system During the maximum flow threshold value of main frame, initial flow demand is set to traffic demand amount.

Alternatively, before being optimized computing, also include:

For each pump in this group parallel-connected pumps, perform:

Obtain the identification number of this pump；

According to the corresponding relation between the identification number of this pump, and identification number and the systematic parameter of pump of the pump preset, really Make the systematic parameter of this pump.

Optionally it is determined that after going out the systematic parameter of this pump, also include:

According to the systematic parameter of pump in this group parallel-connected pumps, the pump in this group parallel-connected pumps is sorted out；Wherein, in same class The rated power of all pumps, rated head and metered flow the most identical；

Each pump for every apoplexy due to endogenous wind distributes classification logotype；Wherein, the classification logotype of each pump is used for identifying: and this pump Belong to variable frequency pump or general pump.

In this group parallel-connected pumps of next cycle, in running order pump is needed optionally it is determined that go out, including:

If it is determined that in this group parallel-connected pumps in the in running order pump of current period: all general pumps are meeting lift need When each variable frequency pump flow rate zone maximum sum of the flow of the amount of asking and all variable frequency pumps is less than traffic demand amount；Then by this group Parallel-connected pumps is defined as the next cycle at the pump that current period is in running order and needs in running order pump, and by this group also Connection pump is not at least one pump of duty at current period be defined as the next cycle and need in running order pump；

If it is determined that in this group parallel-connected pumps in the in running order pump of current period: all general pumps are meeting lift need When the flow rate zone minima sum of each variable frequency pump of the flow of the amount of asking and all variable frequency pumps is more than traffic demand amount；Then by water System at least one pump in the in running order pump of current period is defined as the next cycle and need to be in off working state Pump, water system residual pump in the in running order pump of current period is defined as the next cycle to be needed in running order Pump；

If it is determined that water system is in the in running order pump of current period: all general pumps are meeting lift demand Flow exists not less than traffic demand amount and all general pumps with each variable frequency pump flow rate zone maximum sum of all variable frequency pumps When the flow rate zone minima sum of each variable frequency pump of the flow of current period and all variable frequency pumps is not more than traffic demand amount, Then water system is defined as, at the pump that current period is in running order, the pump that need of next cycle are in running order.

Alternatively, in this group parallel-connected pumps when the next cycle needs in running order pump to be two, next week is determined This group parallel-connected pumps of phase needs the operational factor of in running order each variable frequency pump, including:

If it is determined that this group parallel-connected pumps of next cycle needs in running order pump only include of a sort variable frequency pump, then will Traffic demand amount needs the value of the quantity gained of in running order pump need to be in work as the next cycle divided by the next cycle The flow of each pump in the pump of state；

If it is determined that this group parallel-connected pumps of next cycle needs in running order pump to include general pump and variable frequency pump and this work Frequently pump and this variable frequency pump belong to same class, then traffic demand amount deducts all general pumps that need of next cycle are in running order Meet flow during lift demand, obtain flow to be allocated；Flow to be allocated is needed in running order divided by the next cycle Pump in the value of quantity gained of variable frequency pump need the stream of each variable frequency pump in running order pump as the next cycle Amount；

Wherein, the rated power of all pumps in same class, rated head and metered flow are the most identical.

Alternatively, in this group parallel-connected pumps the next cycle need in running order pump be a variable frequency pump time, under This group parallel-connected pumps of individual cycle needs this in running order variable frequency pump, determines in this group parallel-connected pumps of next cycle and need to be in work Make the operational factor of each variable frequency pump of state, including:

The intersection point of performance curve after the frequency conversion of this variable frequency pump obtained with the pipe system performance curve of water system is determined For the next cycle operating point of this variable frequency pump, and determine this variable frequency pump flow at next cycle operating point, obtain first-class Amount；

The systematic parameter of the pipe system performance curve according to water system and this variable frequency pump, determine this variable frequency pump narrow sense pipe network Characteristic curve；Wherein, narrow sense pipe system performance curve is through the next cycle operating point of initial point He this variable frequency pump；

Determine the stream of narrow sense pipe system performance curve and the intersection point of the performance curve at current period of this variable frequency pump Amount, obtains second flow；

By the ratio of first flow Yu second flow, determine that the next cycle needs the rotating ratio of in running order pump.

The embodiment of the present invention provides a kind of water system control device, including:

Acquiring unit, for for the often group parallel-connected pumps in the water system including least one set parallel-connected pumps, obtains water intake system The traffic demand amount that one group of parallel-connected pumps in next cycle need to meet；

Processing unit, for according to traffic demand amount and constraints, is optimized computing, determines and meet constraints And make to need in this group parallel-connected pumps of next cycle the general power of in running order pump reach minimum under conditions of:

Alternatively, processing unit, it is additionally operable to:

Constraints also includes:

Alternatively, processing unit, it is used for:

Alternatively, acquiring unit, it is used for:

Alternatively, processing unit, it is additionally operable to:

For each pump in this group parallel-connected pumps, perform:

Obtain the identification number of this pump；

Alternatively, processing unit, it is additionally operable to:

Alternatively, in this group parallel-connected pumps when the next cycle needs in running order pump to be two, processing unit, also use In:

Alternatively, in this group parallel-connected pumps the next cycle need in running order pump be a variable frequency pump time, under This group parallel-connected pumps of individual cycle needs this in running order variable frequency pump, processing unit, is additionally operable to:

In the embodiment of the present invention, it is adaptable to include the water system of least one set parallel-connected pumps, for often organizing parallel-connected pumps, the method Including: obtain the traffic demand amount that one group of parallel-connected pumps in water intake system next cycle need to meet；According to traffic demand amount and constraint bar Part, is optimized computing, determines that meet constraints and makes to need in this group parallel-connected pumps of next cycle in running order The general power of pump reach minimum under conditions of: in this group parallel-connected pumps of next cycle, need in running order pump；And When needing the existence variable frequency pump in running order pump in this group parallel-connected pumps of next cycle, determine this group of next cycle also Connection pump needs the operational factor of in running order each variable frequency pump；Wherein, constraints at least includes: this group of next cycle The flow summation of the pump that in parallel-connected pumps, all need are in running order meets traffic demand amount.After being optimized computing, On the one hand ensure that in this group parallel-connected pumps of next cycle, the flow summation of the pump that all need are in running order meets traffic demand amount； On the other hand, that determines after being optimized computing needs in running order pump in this group parallel-connected pumps of next cycle；With And need in running order pump in this group parallel-connected pumps of next cycle existence variable frequency pump time, determine this group of next cycle Parallel-connected pumps needs the operational factor of in running order each variable frequency pump, the general power of this group parallel-connected pumps can be reached Low, i.e. degree of power conservation reaches maximum.

Accompanying drawing explanation

For the technical scheme being illustrated more clearly that in the embodiment of the present invention, in embodiment being described below required for make Accompanying drawing briefly introduce.

Fig. 1 is a kind of system architecture schematic diagram that the embodiment of the present invention is suitable for；

A kind of water system control method schematic flow sheet that Fig. 2 provides for the embodiment of the present invention；

A kind of performance curve that Fig. 2 a provides for the embodiment of the present invention and pipe system performance curve schematic diagram；

A kind of flow-lift schematic diagram that Fig. 2 b provides for the embodiment of the present invention；

The structural representation of the Fig. 3 a kind of water system control device for providing for the embodiment of the present invention.

Detailed description of the invention

In order to make the purpose of the present invention, technical scheme and beneficial effect clearer, below in conjunction with accompanying drawing and enforcement Example, is further elaborated to the present invention.Should be appreciated that specific embodiment described herein is only in order to explain this Bright, it is not intended to limit the present invention.

Fig. 1 illustrates a kind of system architecture schematic diagram that the embodiment of the present invention is suitable for, as it is shown in figure 1, the present invention The system architecture that embodiment is suitable for includes water system control device 101 and water system 102, and water system 102 includes organizing parallel-connected pumps more, Cold temperature pump group in such as water system and cooling pump group etc., one group of parallel-connected pumps includes at least one pump, in one group of parallel-connected pumps The all pumps included be parallel relationship.One group of parallel-connected pumps can only include general pump, or only include variable frequency pump, or bag Include general pump and variable frequency pump, Fig. 1 illustrates the pump 103 in the structural representation of one group of variable frequency pump, such as Fig. 1, pump 104 and pump 105 be one group of variable frequency pump, this group variable frequency pump is parallel relationship between pump 103, pump 104 and pump 105.

Each pump in one group of parallel-connected pumps can include two states, the most in running order pump and be in off working state Pump, say, that the pump that in running order pump is powered on, the pump being in off working state is pent pump.Can Selection of land, the embodiment of the present invention puies forward water system and controls device 101, the state of every pump in control often group parallel-connected pumps, i.e. originally Inventive embodiments can control often organize the opening and closing of every pump in parallel-connected pumps.Further, water system in the embodiment of the present invention System controls device 101 also can realize the regulation of the operational factor to variable frequency pump, such as regulates frequency or the rotating ratio etc. of variable frequency pump Deng.In the embodiment of the present invention, alternatively, each pump that the water in water system is in running order in flowing through this group parallel-connected pumps it After, main frame 106 can be flowed through, by main frame 106 to user side transmission cold energy or heat energy.

Fig. 2 illustrates a kind of water system control method schematic flow sheet that the embodiment of the present invention provides.

Based on the system architecture shown in Fig. 1, as in figure 2 it is shown, a kind of water system control method that the embodiment of the present invention provides, Being applicable to include the water system of least one set parallel-connected pumps, for often organizing parallel-connected pumps, the method includes:

Step 201, obtains the traffic demand amount that one group of parallel-connected pumps in water intake system next cycle need to meet；

Step 202, according to traffic demand amount and constraints, is optimized computing, determine meet constraints and Make to need in this group parallel-connected pumps of next cycle the general power of in running order pump reach minimum under conditions of:

In the embodiment of the present invention, alternatively, obtaining the traffic demand amount in water intake system next cycle, method has a lot, such as Speculated by historical data, or calculated etc. by the prediction loading of user side.

Visible, after being optimized computing, on the one hand ensure that in this group parallel-connected pumps of next cycle, all need are in work The flow summation of the pump making state meets traffic demand amount；On the other hand, determine after being optimized computing in next week This group parallel-connected pumps of phase needs in running order pump；And need in running order pump in this group parallel-connected pumps of next cycle In existence variable frequency pump time, determine that the operation needing in running order each variable frequency pump in this group parallel-connected pumps of next cycle is joined Number, can reach minimum by the general power of this group parallel-connected pumps, i.e. degree of power conservation reaches maximum.

Alternatively, first obtaining the systematic parameter of each pump in this group parallel-connected pumps in the embodiment of the present invention, concrete mode has many Kind, obtaining the systematic parameter of each pump in this group parallel-connected pumps than some data informations such as by this group parallel-connected pumps, this group is also In connection pump, each pump can be general pump or variable frequency pump.In this group parallel-connected pumps, the systematic parameter of each pump is such as rated speed, volume Constant flow, rated power, rated head etc..Alternatively, the operating frequency of variable frequency pump is adjustable, and the lift in water system needs In the case of the amount of asking determines, the flow of general pump determines that, is a value, but the flow of variable frequency pump is can be along with change Frequently the change of the rotating ratio of pump and be adjusted.

Alternatively, the embodiment of the present invention provides a kind of method of systematic parameter obtaining pump, before being optimized computing, pin To each pump in this group parallel-connected pumps, perform:

Obtain the identification number of this pump；According to the identification number of this pump, and the identification number of the pump preset and the systematic parameter of pump Between corresponding relation, determine the systematic parameter of this pump.

Alternatively, in the embodiment of the present invention, when building water system, and when standby pump under unified central planning for water system, to each pump Systematic parameter carries out record, and is the identification number of pump dispensing pump, and build between identification number and the systematic parameter of pump of pump is right Should be related to.In this group parallel-connected pumps, the identification number of each pump can be stored in the memory block of water system in advance, when the present invention implements When water system control device in example needs to be controlled this group parallel-connected pumps, can obtain from the memory block of this water system should The identification number of each pump in group parallel-connected pumps.Alternatively, the corresponding relation between identification number and the systematic parameter of pump of pump can be pre- It is first stored in the memory block of water system, it is possible to be pre-stored within embodiment of the present invention grey water system and control in device.

Further, optionally it is determined that after going out the systematic parameter of this pump, according to the systematic parameter of pump in this group parallel-connected pumps, Pump in this group parallel-connected pumps is sorted out；Wherein, the rated power of all pumps, rated head and the metered flow in same class The most identical；Each pump for every apoplexy due to endogenous wind distributes classification logotype；Wherein, the classification logotype of each pump is used for identifying: this pump belongs to In frequency conversion or power frequency.

Alternatively, water system can include two groups of parallel-connected pumps, the coldest warm water pump group or cooling water pump group, cold warm water pump Group includes that the pump of multiple parallel connection, cooling water pump group include the pump of multiple parallel connection.Alternatively, the classification logotype of each pump is used for referring to Illustrate that this pump belongs to cold warm water pump group or cooling water pump group.Cold warm water pump group is used for carrying cold energy, and cooling water pump group is used for exporting The cooling water of cooling main frame, the main frame in the embodiment of the present invention can be the function host in water system.

Give an example, such as, obtain the systematic parameter of pump in water system, and pump is sorted out, and pump is distributed Classification logotype, as follows:

In this example, one-level dictionary status is not: CWCPG1 and CHWCPG1；Represent that the pump of water system is divided into two groups of parallel connections Pump, CWCPG1 represents cooling water pump group, and CHWCPG1 represents cold warm water pump group；

Two grades of dictionary key names are respectively 1,2, represent and sort out pump in each pump group, the numbering of inhomogeneous pump. Three grades of dictionary key name CF represent that general pump, VF represent variable frequency pump.

Such as, in ' CWCPG1' pump group:

First of a sort pump group ' 1' include pump be respectively as follows: ' CF' general pump is sky, with [] table in above-mentioned example Show, say, that first of a sort pump group ' 2' does not include general pump；' VF' variable frequency pump be respectively [' CWCP1', ' CWCP2']；Wherein, ' CWCP1' and ' CWCP2' is the identification number of pump；

Second of a sort pump group ' 2' include pump be respectively as follows: ' CF' general pump is sky, with [] table in above-mentioned example Show；' VF' variable frequency pump be respectively [' CWCP3']；Wherein, ' CWCP3' is the identification number of pump；

Such as, in ' CHWCPG1' pump group:

First of a sort pump group ' 1' include pump be respectively as follows: ' CF' general pump is sky, with [] table in above-mentioned example Show；' VF' variable frequency pump be respectively [' CHWCP1', ' CHWCP3', ' CHWCP2']；Wherein, ' CHWCP1', ' CHWCP3', ' CHWCP2' is the identification number of pump；

Second of a sort pump group ' the pump that includes of 2' is respectively as follows:

' CF' general pump is empty, above-mentioned example represents with []；' VF' variable frequency pump be respectively [' CWCP4']；Wherein, ' CWCP4' is the identification number of pump.

In above-mentioned example, such as first of a sort pump group ' 1' include pump be respectively as follows: ' CF' general pump is sky, Above-mentioned example represents with []；' VF' variable frequency pump be respectively [' CWCP1', ' CWCP2'], i.e. represent pump ' CWCP1' and pump ' CWCP2' belongs to same class, i.e. the rated power of the pump rated power of the CWCP1' ' with pump ' CWCP2' is identical, and pump ' CWCP1' The metered flow of rated head and pump ' the rated head of CWCP2' identical, pump ' CWCP1' and pump ' the metered flow phase of CWCP2' With.

In above-mentioned example, CF and VF i.e. can be described as classification logotype, and being used for identifying this pump is variable frequency pump or general pump.Optional Ground, CWCPG1 and CHWCPG1 is alternatively referred to as classification logotype, and being used for identifying pump is cold warm water pump group or cooling water pump group.

Alternatively, embodiment of the present invention grey water system controls device can send signaling to water system, and being used for obtaining this should The identification number of each pump in group parallel-connected pumps, such as, water system control device send to water system confirm certain pump be frequency conversion or The signaling of power frequency, water system return value be the return value of the ad-hoc location of the identification number of the identification number of pump, such as pump be " 1 ", then Water system control device, according to the corresponding relation between identification number and the systematic parameter of pump of the pump preset, determines the mark of pump Number ad-hoc location represent that this pump is variable frequency pump for " 1 ".For another example, water system control device sends to water system and confirms certain Pump is the signaling of frequency conversion or power frequency, and water system return value is returning of the ad-hoc location of the identification number of the identification number of pump, such as pump Returning value is " 0 ", then water system control device is according to the corresponding relation between identification number and the systematic parameter of pump of the pump preset, really For " 0 ", the ad-hoc location of the identification number making pump represents that this pump is general pump.

Alternatively, in the embodiment of the present invention, the systematic parameter of acquisition pump, the mathematical model that matching pump is corresponding afterwards, such as Pump lift～flow mathematical model, power～flow mathematical model and efficiency～flow mathematical model etc..

Lift～flow mathematical model such as formula (1) that pump is corresponding are shown:

H=a₁*Q²+a₂*Q+a₃... formula (1)

In above-mentioned formula (1), H is this pump lift, and Q is the flow of this pump；a₁、a₂And a₃It is respectively constant term；a₁、a₂ And a₃Systematic parameter according to pump determines；* multiplication sign is represented.

Power～flow mathematical model such as formula (2) that pump is corresponding are shown:

N=b₁*Q²+b₂*Q+b₃... formula (2)

In above-mentioned formula (2), N is the power of this pump, and Q is the flow of this pump；b₁、b₂And b₃It is respectively constant term；b₁、b₂ And b₃Systematic parameter according to pump determines；* multiplication sign is represented.

Efficiency～flow mathematical model such as formula (3) that pump is corresponding are shown:

η=c₁*Q³+c₂*Q²+c₃*Q+c₄... formula (3)

In above-mentioned formula (3), η is the efficiency of this pump, and Q is the flow of this pump；c₁、c₂And c₃It is respectively constant term；c₁、c₂ And c₃Systematic parameter according to pump determines；* multiplication sign is represented.

Above-mentioned formula (1) is applicable to general pump to formula (3), and is in the variable frequency pump under rated speed.Alternatively, place The rotating ratio of the variable frequency pump under rated speed is 1.

Lift～flow mathematical model such as formula (4) that variable frequency pump is corresponding are shown:

H_i=a_i1*Q_i ²+a_i2*k*Q_i+a_i3*k²... formula (4)

In above-mentioned formula (4), H_iFor this pump lift, Q_iFlow for this pump；a_i1、a_i2And a_i3It is respectively constant term； a_i1、a_i2And a_i3Systematic parameter according to pump determines；* multiplication sign is represented.

Power～flow mathematical model such as formula (5) that variable frequency pump is corresponding are shown:

N_i=b_i1*k*Q_i ²+b_i2*k²*Q_i+b_i3*k³... formula (5)

In above-mentioned formula (5), N_iFor the power of this pump, Q_iFlow for this pump；b_i1、b_i2And b_i3It is respectively constant term； b_i1、b_i2And b_i3Systematic parameter according to pump determines；* multiplication sign is represented.

Efficiency～flow mathematical model such as formula (6) that variable frequency pump is corresponding are shown:

In above-mentioned formula (6), η_iFor the efficiency of this pump, Q_iFlow for this pump；c_i1、c_i2And c_i3It is respectively constant term； c_i1、c_i2And c_i3Systematic parameter according to pump determines；* multiplication sign is represented.

In water system, electric efficiency uses following formula (7) to be calculated:

η _ m=0.94187* (1-exp (-9.04*k)) ... formula (7)

In above-mentioned formula (7), η _ m is the electric efficiency of this pump, and k is the rotating ratio of this pump；* multiplication sign is represented.

In water system, converter efficiency uses following formula (8) to be calculated:

η _ VFD=0.5067+1.283*k-1.42*k²+0.5842*k³... formula (8)

In above-mentioned formula (8), η _ VFD is the converter efficiency of this pump, and k is the rotating ratio of this pump；* multiplication sign is represented.

In water system, power can use following formula (9) to be calculated:

N=g*Q*H/ (3600* η) ... formula (9)

In above-mentioned formula (9), N is the power of pump, and η is the efficiency of pump, and g is acceleration of gravity；Q is flow；H is for raising Journey；* represent multiplication sign ,/represent divided by.In the embodiment of the present invention/represent divided by.

Alternatively, in the embodiment of the present invention, the next cycle in this group parallel-connected pumps whole that calculates needs in running order pump General power, specific algorithm is:

Calculate the general power needing in running order pump in this group parallel-connected pumps of next cycle, be embodied as:

In above-mentioned formula (10), P is the general power needing in running order pump in this group parallel-connected pumps of next cycle, N is the quantity needing in running order pump in this group parallel-connected pumps of next cycle, and j is variable, and span is [1, n]；P_j For needing the power of in running order each pump in this group parallel-connected pumps of next cycle；Wherein:

When to need in running order pump in this group parallel-connected pumps of next cycle be general pump,

Wherein, N_jThe power of this pump for obtaining according to formula (2)；η_jFor according to formula (3) The efficiency of this pump obtained；η _ m is the electric efficiency of this pump in above-mentioned formula (7)；The now k=1 in formula；

When to need in running order pump in this group parallel-connected pumps of next cycle be variable frequency pump,

Wherein, N_jThe power of this pump for obtaining according to formula (5)；η_jFor Efficiency according to this pump that formula (6) obtains；η _ m is the electric efficiency of this pump in above-mentioned formula (7)；η _ VFD is above-mentioned formula (8) the converter efficiency of this pump in.

Alternatively, this group parallel-connected pumps includes general pump and variable frequency pump, obtains one group of this group parallel-connected pumps next cycle also After the traffic demand amount that connection pump need to meet, before being optimized computing, also include:

According to the systematic parameter of each variable frequency pump in lift demand, this group parallel-connected pumps, and each variable frequency pump preset Efficiency threshold, determine the flow rate zone of variable frequency pump in this group parallel-connected pumps.

Constraints also includes:

It is to say, the work in the embodiment of the present invention, after determining the lift demand in next cycle, in this group parallel-connected pumps Frequently the flow of pump just has determined that, i.e. needs the stream of in running order each general pump in this group parallel-connected pumps of next cycle Amount is for meeting flow during lift demand.And after lift demand determines, the flow of variable frequency pump or adjustable.

Give an example, this group parallel-connected pumps of next cycle need in running order pump to include pump 1, pump 2 and pump 3 and pump 4, Pump 1 and pump 2 are general pump, and pump 3 and pump 4 are variable frequency pump, it is determined that after lift demand, determine according to this lift demand The pump 1 flow in the case of this lift demand of next working cycle internal satisfaction, and pump 2 within the next working cycle Meet the flow in the case of this lift demand, afterwards, adjust pump 3 and the rotating ratio of pump 4, thus have adjusted pump 3 and pump 4 exists The flow in next cycle, so that pump 1, pump 2 and pump 3 and the pump 4 flow summation in the next cycle meet traffic demand amount and make pump The flow of 3 is in the flow rate zone of pump 3, makes the flow of pump 4 be in the flow rate zone of pump 4, and determines pump 1 of sening as an envoy to, pump 2 and Pump 3 and the pump 4 general power in the next cycle reach rotating ratio and the rotating ratio of pump 4 of minimum pump 3.

Alternatively, the efficiency threshold preset is a bigger value, such as 82%, 75% etc..I.e. due to according to presetting Efficiency threshold, determine the flow rate zone of variable frequency pump in this group parallel-connected pumps, and constraints be included in this group of next cycle also Connection pump need the flow of in running order each variable frequency pump to be in the flow rate zone that this variable frequency pump is corresponding, therefore, variable frequency pump As long as being operated in this flow rate zone, can ensure that the efficiency of this variable frequency pump is in a higher degree, say, that, it is ensured that The next cycle needs in running order each variable frequency pump to be in efficiency operation state.That is, not only full in the embodiment of the present invention The foot efficiency requirements of each pump, reduces the power consumption of water system the most generally.

In the embodiment of the present invention, this group parallel-connected pumps there is multiple pump, determines that the method for the flow rate zone of this variable frequency pump is similar, In the description below as a example by a variable frequency pump, the method introducing the flow rate zone determining variable frequency pump.

According to the systematic parameter of this variable frequency pump obtained, determining the performance curve of this variable frequency pump, Fig. 2 a is exemplary Show a kind of performance curve that the embodiment of the present invention provides and pipe system performance curve schematic diagram, such as Fig. 2 a institute Showing, transverse axis 2101 represents that flow, the longitudinal axis 2102 represent that lift, curve 2103 represent the performance curve of variable frequency pump, curve 2104 pipe system performance curves representing this group parallel-connected pumps, the intersection point of the pipe system performance curve of the performance curve of pump and water system 2105 operating points being variable frequency pump.

Alternatively, efficiency threshold has and multiple determines method, the most directly arranges a higher value, and such as 80%.This Bright embodiment provides a kind of method, according to the sample data of every pump and efficiency and flow formula, determines that this pump is corresponding Efficiency flow curve, and determine the efficiency peak of this pump, i.e. best efficiency point, use best efficiency point to deduct one afterwards Individual default value, i.e. obtains the efficiency threshold of this variable frequency pump, and efficiency threshold to best efficiency point is the efficient flow rate zone of this pump. Such as, variable frequency pump the next cycle best efficiency point be 82%, then deduct a default value 7% by 82%, obtain 75% efficiency threshold being set to this variable frequency pump.Alternatively, can be that each variable frequency pump arranges an efficiency threshold, it is possible to be all Variable frequency pump arranges same efficiency threshold, at this point it is possible to select the efficiency of in running order all variable frequency pumps of next cycle Minima in threshold value is as this same efficiency threshold.

Alternatively, calculate two flow values that variable frequency pump is corresponding at this efficiency threshold, these two flow values obtained The initial flow being this pump is interval.Owing to the efficiency of pump and the curve of discharge relation are a parabola；Therefore, efficiency with On the curve of discharge relation, efficiency threshold can two points on the efficiency curve of respective pump, i.e. one efficiency threshold can be right Two flow values of this pump should be gone out.Such as, pump when reaching efficiency and being 75%, the flow of the pump calculated be 600m3/h (cube Rice is per hour) and 850m3/h, then the initial flow interval of pump is 600m³/ h to 850m³/h。

According to the performance curve of this variable frequency pump, determine the flow that variable frequency pump is corresponding at lift demand, such as, become Frequently the flow that pump is corresponding at lift demand is 900m³/ h, due to 900m³The maximum that/h is interval more than initial flow 850m³/ h, accordingly, it is determined that the flow rate zone of this pump is 600m³/ h to 900m³/h；

For another example, the flow that variable frequency pump is corresponding at lift demand is 550m³/ h, due to 550m³/ h is less than initial flow Interval minima 600m³/ h, accordingly, it is determined that the flow rate zone of this pump is 550m³/ h to 850m³/h；

For another example, the flow that pump is corresponding at lift demand is 700m³/ h, due to 700m³/ h is not less than initial flow district Between minima 600m³/ h, and the maximum 850m that no more than initial flow is interval³/ h, accordingly, it is determined that the flow rate zone of this pump For 600m³/ h to 850m³/h。

Obtain the initial flow demand of this group parallel-connected pumps in water intake system next cycle；Determining that initial flow demand is little When the minimum flow threshold value of the main frame of water system, minimum flow threshold value is set to traffic demand amount；Determining initial flow When demand is more than the maximum flow threshold value of the main frame of water system, maximum flow threshold value is set to traffic demand amount；Determining The initial flow demand minimum flow threshold value not less than the main frame of water system and the maximum flow of the no more than main frame of water system During threshold value, initial flow demand is set to traffic demand amount.

Alternatively, there is the minimum flow threshold value and maximum flow threshold value, maximum flow preset in the main frame correspondence of water system Threshold value is positioned in the range of minimum flow threshold value and maximum flow threshold value more than minimum flow threshold value, the only total flow of water system Time, the safety of guarantee whole water system, the current driven due to all pumps of whole water system are both needed to by water system Main frame, the traffic demand amount in the most next cycle must is fulfilled for minimum flow threshold value and the maximum flow threshold value of main frame.This In bright embodiment, by the regulation to above-mentioned initial flow demand, it is ensured that the traffic demand amount in next cycle meets main frame Minimum flow threshold value and the restriction of maximum flow threshold value.

In the embodiment of the present invention, can be according to the traffic demand amount in this group parallel-connected pumps next cycle, in this group parallel-connected pumps Pump carries out loading and off-load, saves energy further.Alternatively, need in this group parallel-connected pumps of next cycle in running order Pump, including:

In order to avoid the opening and closing frequently of pump, therefore, the most true according to the pump that current period is in running order Fix cycle in running order pump.Giving an example, the pump that such as current period has been switched on is pump 1, pump 2 and pump 3, not The pump opened is pump 4 and pump 5, and wherein, pump 1 and pump 2 are general pump, and pump 3, pump 4 and pump 5 are variable frequency pump；Wherein,

If it is determined that pump 1 meets the flow of lift demand, pump 2 meets the flow of lift demand and pump 3 is in the next cycle In flow rate zone maximum sum less than traffic demand amount time, illustrate to need load pump, i.e. needs to be then turned on a pump, unlatching Pump 4 or pump 5；

If it is determined that pump 1 meets the flow of lift demand, pump 2 meets the flow of lift demand and pump 3 is in the next cycle In flow rate zone minima sum more than traffic demand amount time；Then illustrate that this group parallel-connected pumps needs off-load, i.e. close a pump, I.e. need the pump in pump 1, pump 2 and pump 3 to cut out at least one, using the pump that is not turned off in pump 1, pump 2 and pump 3 as the next cycle Need in running order pump；

If really pump 1 meets the flow of lift demand, pump 2 meets the flow of lift demand and pump 3 is in the next cycle Flow rate zone maximum not less than traffic demand amount；And pump 1 meets the flow of lift demand, pump 2 meets lift demand Flow and the pump 3 flow rate zone minima sum in next cycle when being not more than traffic demand amount, the most next cycle needs place Pump in duty is pump 1, pump 2 and pump 3, is i.e. not loaded with the most not off-load, when being now optimized computing, it is only necessary to optimize pump The rotating ratio of 3, so that this group parallel-connected pumps of water system is in the case of meeting constraints, needs in this group parallel-connected pumps of next cycle The general power of in running order pump reaches minimum.Such as, when the rotating ratio of pump 3 is k1, k2 and k3, it is satisfied by retraining bar Part, now selects the suitable rotating ratio of pump 3, so that needing the total work of in running order pump in this group parallel-connected pumps of next cycle Rate reaches minimum, specifically, when the rotating ratio of calculating pump 3 is k1, k2 and k3 respectively, needs place in this group parallel-connected pumps of next cycle In three general powers of the pump of duty, therefrom select the general power of minimum, and determine corresponding the turning of general power of this minimum Speed ratio is this pump 3 rotating ratio in the next cycle.Alternatively, in being embodied as, during the loading or off-load of pump, can pass through 15 minutes, run to stable state.

Alternatively, when the next cycle needs the quantity of in running order pump to be at least two, in this group parallel-connected pumps under The individual cycle needs in running order pump when being two, determine this group parallel-connected pumps of next cycle needs in running order every The operational factor of individual variable frequency pump, including:

If it is determined that this group parallel-connected pumps of next cycle needs in running order pump to include general pump and variable frequency pump and this work Frequently pump and this variable frequency pump belong to same class, then traffic demand amount deducts all general pumps that need of next cycle are in running order Meet flow during lift demand, obtain flow to be allocated；Flow to be allocated is needed in running order divided by the next cycle Pump in the value of quantity gained of variable frequency pump need the stream of each variable frequency pump in running order pump as the next cycle Amount.

By above-mentioned flow allocation method, can on the one hand ensure that the efficiency of pump is positioned at efficiency interval, i.e. ensure next week Phase needs in running order each pump to be in efficiency operation state；On the other hand, it is ensured that the next cycle need to be in work shape The total flow of the pump of state meets traffic demand amount；The third aspect, after being optimized computing, is meeting the situation of constraints Under, the next cycle needs the general power of in running order pump to reach minimum, i.e. degree of power conservation reaches maximum.

This group parallel-connected pumps is divided into without back pressure and the state having back pressure, in being embodied as, the pipe network of this group parallel-connected pumps of enclosed Characteristic equation is generally written into equation below form, as shown in formula (10):

H=S₁*Q²... formula (10)

In formula (10), H is lift, and Q is flow, S₁For pipe network impedance, unit s²/m⁵；Constant, * is for taking advantage of.

Shown in the equation such as formula (11) of the pipe system performance curve with back pressure control:

H=det_p/9.8+S₂*Q²... formula (11)

In formula (11), H is lift, and Q is flow, S₂For pipe network impedance, unit s²/m⁵；* for taking advantage of, det_p is pressure, Pressure unit is on the basis of kPa (kPa).

In being embodied as, the water service system of open type, such as the equation such as formula (12) of the pipe system performance curve of cooling system Shown in:

H=H0+S3*Q²... formula (12)

In formula (12), H is lift, H0: tower body lift, and Q is flow, S₃For pipe network impedance, unit s²/m⁵；* for taking advantage of.

Embodiment of the present invention grey water system can be a water system system or secondary water system, and the equation of pipe system performance curve can Equation with reference to the pipe system performance curve of above-mentioned water system.

When water system includes back pressure apparatus, alternatively, this group parallel-connected pumps need in running order in the next cycle Pump when being a variable frequency pump, need this in running order variable frequency pump in this group parallel-connected pumps of next cycle, determine down This group parallel-connected pumps of individual cycle needs the operational factor of in running order each variable frequency pump, including:

Alternatively, when the next cycle needs in running order pump to be a variable frequency pump, the next cycle need to be in work shape The pump of state is also at duty at current period, and Fig. 2 b illustrates a kind of flow-raise that the embodiment of the present invention provides Journey schematic diagram, as shown in Figure 2 b, transverse axis 2201 represents that flow, the longitudinal axis 2202 represent lift.Curve 2203 represents at current period The operation characteristic of the pump corresponding under the rotating ratio of current operating cycle with the variable frequency pump that the next cycle is in duty is bent Line；Curve 2204 represents the variable frequency pump rotating speed in the next working cycle being in duty at current period and next cycle Performance curve than the pump of lower correspondence.Curve 2205 is the pipe system performance curve of water system, curve 2205 and curve 2203 Intersection point 2207 be this variable frequency pump operating point in the next cycle, curve 2205 is this variable frequency pump with the intersection point 2208 of curve 2203 Operating point at current period.Curve 2206 is the narrow sense pipe system performance curve that this variable frequency pump is corresponding, narrow sense pipe system performance curve The operating point in the next cycle of in running order pump is needed through initial point and next cycle.Determine narrow sense pipe system performance curve with The next cycle needs the second flow of the intersection point of the performance curve at current period of in running order pump；I.e. intersection point Flow corresponding at 2209 is second flow, and flow corresponding at intersection point 2207 is first flow, by first flow and second The ratio of amount, determines that the next cycle needs the rotating ratio of in running order pump.Alternatively, by said method, can be in equivalence In the case of use proportionality law to try to achieve the rotating ratio of variable frequency pump.Generally use first flow and intersection point in compared to existing technology The ratio of flow corresponding at 2208, determines that the next cycle needs the scheme of the rotating ratio of in running order pump, it is possible to more Determine that the next cycle needs the rotating ratio of in running order pump accurately.

In the embodiment of the present invention, alternatively, if carried out optimizing computing, do not determine and meet the next of constraints Cycle needs in running order pump, outside being positioned at, than the flow if any a pump, the flow rate zone that this pump is corresponding, the most now needs Optimization computing to be re-started, when re-starting optimization computing, constraints is modified accordingly, will stream corresponding to each pump Amount interval is relaxed and is commonly used option for user.After the flow rate zone of the pump in change constraints, re-start optimization, now full The efficiency summation of foot this group parallel-connected pumps whole reaches maximum, in the case, makes the next cycle need in running order as far as possible The general power of pump reaches relatively low level.

It can be seen from the above: the embodiment of the present invention is applicable to include the water system of least one set parallel-connected pumps, for Often organizing parallel-connected pumps, the method includes: obtain the traffic demand amount that one group of parallel-connected pumps in water intake system next cycle need to meet；According to stream Amount demand and constraints, is optimized computing, determines that meet constraints and makes at this group parallel-connected pumps of next cycle The general power of the pump that middle need are in running order reach minimum under conditions of: need to be in work in this group parallel-connected pumps of next cycle Make the pump of state；And need in running order pump in this group parallel-connected pumps of next cycle existence variable frequency pump time, determine Go out the operational factor needing in running order each variable frequency pump in this group parallel-connected pumps of next cycle；Wherein, constraints is at least Including: in this group parallel-connected pumps of next cycle, the flow summation of the pump that all need are in running order meets traffic demand amount.Due to After being optimized computing, on the one hand ensure that in this group parallel-connected pumps of next cycle, the flow of the pump that all need are in running order is total With meet traffic demand amount；On the other hand, that determines after being optimized computing needs place in this group parallel-connected pumps of next cycle Pump in duty；And need in running order pump in this group parallel-connected pumps of next cycle existence variable frequency pump time, Determine the operational factor needing in running order each variable frequency pump in this group parallel-connected pumps of next cycle, can be in parallel by this group The general power of pump reaches minimum, i.e. degree of power conservation reaches maximum.

Fig. 3 illustrates the structural representation of a kind of water system control device that the embodiment of the present invention provides.

Based on same idea, the embodiment of the present invention provides a kind of water system control device, is used for performing said method flow process, This water system control device 300 includes acquiring unit 301 and processing unit 302, wherein:

Alternatively, processing unit, it is additionally operable to:

Constraints also includes:

Alternatively, processing unit, it is used for:

Alternatively, acquiring unit, it is used for:

Alternatively, processing unit, it is additionally operable to:

For each pump in this group parallel-connected pumps, perform:

Obtain the identification number of this pump；

Alternatively, processing unit, it is additionally operable to:

It can be seen from the above: the embodiment of the present invention is applicable to include the water system of least one set parallel-connected pumps, for Often organizing parallel-connected pumps, the method includes: obtain the traffic demand amount that one group of parallel-connected pumps in water intake system next cycle need to meet；According to stream Amount demand and constraints, is optimized computing, determines that meet constraints and makes at this group parallel-connected pumps of next cycle The general power of the pump that middle need are in running order reach minimum under conditions of: need to be in work in this group parallel-connected pumps of next cycle Make the pump of state；And need in running order pump in this group parallel-connected pumps of next cycle existence variable frequency pump time, determine Go out the operational factor needing in running order each variable frequency pump in this group parallel-connected pumps of next cycle；Wherein, constraints is at least Including: in this group parallel-connected pumps of next cycle, the flow summation of the pump that all need are in running order meets traffic demand amount.Due to After being optimized computing, on the one hand ensure that in this group parallel-connected pumps of next cycle, the flow of the pump that all need are in running order is total With meet traffic demand amount；On the other hand, that determines after being optimized computing needs place in this group parallel-connected pumps of next cycle Pump in duty；And need in running order pump in this group parallel-connected pumps of next cycle existence variable frequency pump time, Determine the operational factor needing in running order each variable frequency pump in this group parallel-connected pumps of next cycle, can be in parallel by this group The general power of pump reaches minimum, i.e. degree of power conservation reaches maximum.Those skilled in the art are it should be appreciated that embodiments of the invention Method or computer program can be provided as.Therefore, the present invention can use complete hardware embodiment, complete software implementation, Or combine the form of embodiment in terms of software and hardware.And, the present invention can use and wherein include meter one or more The computer-usable storage medium of calculation machine usable program code (includes but not limited to disk memory, CD-ROM, optical memory Deng) form of the upper computer program implemented.

The present invention is with reference to method, device (system) and the flow process of computer program according to embodiments of the present invention Figure and/or block diagram describe.It should be understood that can the most first-class by computer program instructions flowchart and/or block diagram Flow process in journey and/or square frame and flow chart and/or block diagram and/or the combination of square frame.These computer programs can be provided Instruction arrives the processor of general purpose computer, special-purpose computer, Embedded Processor or other programmable data processing meanss to produce A raw machine so that the instruction performed by the processor of computer or other programmable data processing meanss is produced for real The device of the function specified in one flow process of flow chart or multiple flow process and/or one square frame of block diagram or multiple square frame now.

These computer program instructions may be alternatively stored in and computer or other programmable data processing meanss can be guided with spy Determine in the computer-readable memory that mode works so that the instruction being stored in this computer-readable memory produces and includes referring to Make the manufacture of device, this command device realize at one flow process of flow chart or multiple flow process and/or one square frame of block diagram or The function specified in multiple square frames.

These computer program instructions also can be loaded in computer or other programmable data processing meanss so that at meter Perform sequence of operations step on calculation machine or other programmable devices to produce computer implemented process, thus at computer or The instruction performed on other programmable devices provides for realizing at one flow process of flow chart or multiple flow process and/or block diagram one The step of the function specified in individual square frame or multiple square frame.

Although preferred embodiments of the present invention have been described, but those skilled in the art once know basic creation Property concept, then can make other change and amendment to these embodiments.So, claims are intended to be construed to include excellent Select embodiment and fall into all changes and the amendment of the scope of the invention.

Obviously, those skilled in the art can carry out various change and the modification essence without deviating from the present invention to the present invention God and scope.So, if these amendments of the present invention and modification belong to the scope of the claims in the present invention and equivalent technologies thereof Within, then the present invention is also intended to comprise these change and modification.

Claims

1. a water system control method, it is characterised in that be applicable to include the water system of least one set parallel-connected pumps, for often group Parallel-connected pumps, the method includes:

According to described traffic demand amount and constraints, it is optimized computing, determines that meet described constraints and make This group parallel-connected pumps of described next cycle needs the general power of in running order pump reach minimum under conditions of:

In running order pump is needed in this group parallel-connected pumps of described next cycle；And at this group parallel-connected pumps of described next cycle During existence variable frequency pump in the pump that middle need are in running order, determine in this group parallel-connected pumps of described next cycle and need to be in work The operational factor of each variable frequency pump of state；

Wherein, described constraints at least includes: the pump that in this group parallel-connected pumps of described next cycle, all need are in running order Flow summation meet described traffic demand amount.

2. the method for claim 1, it is characterised in that described in obtain one group of parallel-connected pumps in water intake system next cycle and need to expire After the traffic demand amount of foot, before being optimized computing, also include:

According to the pipe system performance curve of described water system, and described traffic demand amount, determine that the lift of described water system needs The amount of asking；

According to described lift demand, determine the stream when meeting described lift demand of the general pump in this group parallel-connected pumps Amount；

According to the systematic parameter of each variable frequency pump in described lift demand, this group parallel-connected pumps, and each variable frequency pump preset Efficiency threshold, determine the flow rate zone of variable frequency pump in this group parallel-connected pumps；

Described constraints also includes:

When needing that in running order pump exists variable frequency pump in this group parallel-connected pumps of described next cycle, in the described next cycle This group parallel-connected pumps need the flow of in running order each variable frequency pump be in the flow rate zone that this variable frequency pump is corresponding；

When needing that in running order pump exists general pump in this group parallel-connected pumps of described next cycle, in the described next cycle Flow when to need the flow of in running order each general pump in this group parallel-connected pumps be to meet described lift demand.

3. method as claimed in claim 2, it is characterised in that described according to every in described lift demand, this group parallel-connected pumps The systematic parameter of individual variable frequency pump, and the efficiency of the variable frequency pump preset is interval, determines the flow of variable frequency pump in this group parallel-connected pumps Interval, including:

According to the performance curve of this variable frequency pump, determine that the initial flow of this variable frequency pump is interval, wherein, the stream of this variable frequency pump When value is positioned at described initial flow interval, the work efficiency of this variable frequency pump is not less than the efficiency threshold of this variable frequency pump；

According to described lift demand, determine the flow value that this variable frequency pump is corresponding when meeting described lift demand, determining When described flow value is more than the peak flow values that described initial flow is interval, by minimum stream value in described initial flow interval extremely Interval between described flow value is defined as the flow rate zone of this pump；

According to described lift demand, determine the flow value that this variable frequency pump is corresponding when meeting described lift demand, determining When described flow value is less than the minimum stream value that described initial flow is interval, by described flow value to described initial flow interval Interval between peak flow values is defined as the flow rate zone of this pump；

According to described lift demand, determine the flow value that this variable frequency pump is corresponding when meeting described lift demand, determining Described flow value is not more than the peak flow values that described initial flow is interval, and the minimum stream interval not less than described initial flow During value, described initial flow interval is defined as the flow rate zone of this pump.

4. the method for claim 1, it is characterised in that described in obtain one group of parallel-connected pumps in water intake system next cycle and need to expire The traffic demand amount of foot, including:

Obtain the initial flow demand of this group parallel-connected pumps in described water system next cycle；

When determining described initial flow demand less than the minimum flow threshold value of the main frame of described water system, by described lowest stream Amount threshold value is set to described traffic demand amount；

When determining described initial flow demand more than the maximum flow threshold value of the main frame of described water system, by the highest described stream Amount threshold value is set to described traffic demand amount；

Determining that described initial flow demand not less than the minimum flow threshold value of the main frame of described water system and is not more than described During the maximum flow threshold value of the main frame of water system, described initial flow demand is set to described traffic demand amount.

5. the method for claim 1, it is characterised in that described in be optimized computing before, also include:

For each pump in this group parallel-connected pumps, perform:

Obtain the identification number of this pump；

According to the corresponding relation between the identification number of this pump, and identification number and the systematic parameter of pump of the pump preset, determine The systematic parameter of this pump.

6. method as claimed in claim 5, it is characterised in that described in determine this pump systematic parameter after, also include:

According to the systematic parameter of pump in this group parallel-connected pumps, the pump in this group parallel-connected pumps is sorted out；Wherein, the institute in same class There are the rated power of pump, rated head the most identical with metered flow；

Each pump for every apoplexy due to endogenous wind distributes classification logotype；Wherein, the classification logotype of each pump is used for identifying: and this pump belongs to Variable frequency pump or general pump.

7. the method for claim 1, it is characterised in that determine and need to be in this group parallel-connected pumps of described next cycle The pump of duty, including:

If it is determined that in this group parallel-connected pumps in the in running order pump of current period: all general pumps are meeting described lift need When each variable frequency pump flow rate zone maximum sum of the flow of the amount of asking and all variable frequency pumps is less than described traffic demand amount；Then will This group parallel-connected pumps is defined as, at the pump that current period is in running order, the pump that need of described next cycle are in running order, and It is defined as the described next cycle need to be in work by this group parallel-connected pumps is not at least one pump of duty at current period Make the pump of state；

If it is determined that in this group parallel-connected pumps in the in running order pump of current period: all general pumps are meeting described lift need When the flow rate zone minima sum of each variable frequency pump of the flow of the amount of asking and all variable frequency pumps is more than described traffic demand amount；Then Described water system at least one pump in the in running order pump of current period is defined as the described next cycle need to be in The pump of off working state, is defined as described next by described water system residual pump in the in running order pump of current period Cycle needs in running order pump；

If it is determined that described water system is in the in running order pump of current period: all general pumps are meeting described lift demand The flow of amount and owns not less than described traffic demand amount with each variable frequency pump flow rate zone maximum sum of all variable frequency pumps General pump is not more than described at the flow of current period with the flow rate zone minima sum of each variable frequency pump of all variable frequency pumps During traffic demand amount, then at the pump that current period is in running order described water system being defined as the described next cycle need to be in The pump of duty.

8. the method for claim 1, it is characterised in that work shape need to be in the described next cycle in this group parallel-connected pumps When the pump of state is two, described in determine this group parallel-connected pumps of described next cycle need in running order each variable frequency pump Operational factor, including:

If it is determined that this group parallel-connected pumps of described next cycle needs in running order pump only include of a sort variable frequency pump, then will Described traffic demand amount needs the value of the quantity gained of in running order pump as described next week divided by the described next cycle Phase needs the flow of each pump in running order pump；

If it is determined that this group parallel-connected pumps of described next cycle needs in running order pump to include general pump and variable frequency pump and this work Frequently pump and this variable frequency pump belong to same class, then described traffic demand amount deducts the institute that need of described next cycle are in running order Flow when having general pump to meet described lift demand, obtains flow to be allocated；By described flow to be allocated divided by under described The individual cycle needs the value of the quantity gained of the variable frequency pump in running order pump need to be in work shape as the described next cycle The flow of each variable frequency pump in the pump of state；

9. the method for claim 1, it is characterised in that work shape need to be in the described next cycle in this group parallel-connected pumps When the pump of state is a variable frequency pump, need this in running order variable frequency pump, institute in this group parallel-connected pumps of described next cycle State and determine the operational factor needing in running order each variable frequency pump in this group parallel-connected pumps of described next cycle, including:

The intersection point of performance curve after the frequency conversion of this variable frequency pump obtained with the pipe system performance curve of described water system is determined For the next cycle operating point of this variable frequency pump, and determine this variable frequency pump flow at described next cycle operating point, obtain One flow；

The systematic parameter of the pipe system performance curve according to described water system and this variable frequency pump, determine this variable frequency pump narrow sense pipe network Characteristic curve；Wherein, described narrow sense pipe system performance curve is through the described next cycle operating point of initial point He this variable frequency pump；

Determine the stream of described narrow sense pipe system performance curve and the intersection point of the performance curve at current period of this variable frequency pump Amount, obtains second flow；

By the ratio of described first flow Yu described second flow, determine that the described next cycle needs turning of in running order pump Speed ratio.

10. a water system control device, it is characterised in that including:

Acquiring unit, for for the often group parallel-connected pumps in the water system including least one set parallel-connected pumps, obtains water intake system next The traffic demand amount that one group of parallel-connected pumps in cycle need to meet；

Processing unit, for according to described traffic demand amount and constraints, is optimized computing, determines and meet described constraint Condition and make to need the general power of in running order pump to reach minimum condition in this group parallel-connected pumps of described next cycle Under:

11. devices as claimed in claim 10, it is characterised in that described processing unit, are additionally operable to:

Described constraints also includes:

12. devices as claimed in claim 11, it is characterised in that described processing unit, are used for:

13. devices as claimed in claim 10, it is characterised in that described acquiring unit, are used for:

14. devices as claimed in claim 10, it is characterised in that described processing unit, are additionally operable to:

For each pump in this group parallel-connected pumps, perform:

Obtain the identification number of this pump；

15. devices as claimed in claim 14, it is characterised in that described processing unit, are additionally operable to:

16. devices as claimed in claim 10, it is characterised in that described processing unit, are additionally operable to:

17. devices as claimed in claim 10, it is characterised in that work need to be in the described next cycle in this group parallel-connected pumps When the pump of state is two, described processing unit, it is additionally operable to:

18. devices as claimed in claim 10, it is characterised in that work need to be in the described next cycle in this group parallel-connected pumps When the pump of state is a variable frequency pump, need this in running order variable frequency pump in this group parallel-connected pumps of described next cycle, Described processing unit, is additionally operable to: