CN110242531B - Energy-saving control method for constant-power plunger variable pump set driving system - Google Patents
Energy-saving control method for constant-power plunger variable pump set driving system Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B13/00—Pumps specially modified to deliver fixed or variable measured quantities
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
- F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B23/00—Pumping installations or systems
- F04B23/04—Combinations of two or more pumps
- F04B23/06—Combinations of two or more pumps the pumps being all of reciprocating positive-displacement type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
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Abstract
The invention discloses an energy-saving control method of a constant-power plunger variable pump set driving system, which comprises a constant-power plunger variable pump driving unit, a load hydraulic cylinder and a frequency converter, wherein the constant-power plunger variable pump set driving unit consists of a three-phase asynchronous motor and a constant-power plunger variable pump, and the frequency converter is used for adjusting the rotating speed of the three-phase asynchronous motor. According to the invention, different numbers of constant-power plunger variable pump driving units are respectively called to be in constant-power control and no-load operation states according to the flow and pressure requirements of different stages of the load. And establishing a rotation speed optimization model, calculating to obtain the optimal energy-saving target rotation speed under constant power control and no-load operation states, and controlling a frequency converter in each constant-power plunger variable pump driving unit to adjust the rotation speed of the asynchronous motor to the optimal energy-saving target rotation speed by using a control circuit, so that the no-load loss power of a constant-power plunger variable pump group driving system is reduced, and the input power and the output power of the constant-power plunger variable pump group driving system are matched as much as possible.
Description
Technical Field
The invention relates to an energy-saving speed regulation strategy of an asynchronous motor-constant power plunger variable pump driving unit, in particular to an energy-saving control method of a constant power plunger variable pump set driving system.
Background
The asynchronous motor-constant power plunger variable pump driving unit has the advantages of simple structure, convenience in adjustment, high cost performance and the like, and is widely applied to the situations of high flow, high power and flow adjustment requirements, such as large-scale hydraulic machinery, ships and the like.
In the actual working process of the driving unit, according to the characteristics of a hydraulic transmission system, only under the working condition of high load pressure, the motor and the pump can efficiently operate, under the working condition that other load requirements are not large or even zero, the energy efficiency of the motor is low, and a large amount of energy loss is caused by mismatching of the output power of the motor and the load required power. Therefore, the reduction of the power loss of the driving unit through the speed regulation control strategy has important significance and effect on improving the energy utilization efficiency of the driving unit, and meanwhile, the speed regulation control strategy has reference value on the transformation of large-size hydraulic forming equipment.
Patent applicationThe number CN108278200A provides a power test system and a method for a loss power test system of an asynchronous motor-constant power plunger pump, the test method utilizes the test system to carry out three rotational speed experiments, and the reliable and accurate rotational speed n and total loss power P of the asynchronous motor-constant power plunger variable pump can be obtainedWThe positive correlation relationship between the total power loss of the asynchronous motor and the constant power plunger variable pump and the rotation speed n is a quadratic function is found.
Disclosure of Invention
The invention aims to provide an energy-saving control method of a constant-power plunger variable pump set driving system, which is based on the loss mechanism of a motor and a pump, reduces power loss caused by mismatching of output power and load required power by adjusting the input rotating speed of a constant-power plunger variable pump driving unit, and achieves the effects of energy conservation and emission reduction.
In order to realize the purpose, the invention adopts the technical scheme that:
an energy-saving control method for a constant-power plunger variable pump set driving system comprises the following steps: the constant-power plunger variable pump driving unit comprises a three-phase asynchronous motor and a constant-power variable pump, a load hydraulic cylinder driven by the constant-power plunger variable pump driving unit and a frequency converter for adjusting the rotating speed of the three-phase asynchronous motor, wherein the number of the constant-power plunger variable pump driving units is two or more; the method is characterized in that: the load demand flow of the constant-power plunger variable pump set driving system is provided by all the constant-power plunger variable pump driving units together; the energy-saving control method of the constant-power plunger variable pump set driving system comprises the following steps: according to the flow and pressure requirements of different stages of the load, calling different numbers of constant-power plunger variable pump driving units to be in constant-power control and no-load operation states respectively, establishing a rotation speed optimization model, calculating and obtaining the optimal energy-saving target rotation speed in the constant-power control and no-load operation states, and adjusting the rotation speed of a three-phase asynchronous motor of a constant-power plunger variable pump group driving system to the optimal energy-saving target rotation speed by using a frequency converter in each constant-power plunger variable pump driving unit.
The energy-saving control method of the constant-power plunger variable pump set driving system is characterized by comprising the following steps of:
in the formula (1), qiActually outputting the flow for the driving unit; q. q.sVThe total volume loss flow of the plunger pump; q. q.sTThe theoretical output flow of the plunger pump is obtained; q. q.sV1、qV2、qV3、qV4Respectively obtaining plunger pump compression volume loss flow, expansion volume loss flow, flow distribution pair leakage loss flow and sliding shoe pair leakage loss flow;
wherein, the theoretical output flow of the plunger pump
Order to
Then
Compressed volume loss flow
Order to
Q is thenV1＝Cv1N; volume loss flow of expansion
Order to
Q is thenV2＝Cv21psn-Cv22n; leakage loss flow of flow distribution pair
Order to
Q is thenV3＝Cv3·ps(ii) a Sliding shoe pair leakage loss flow
Order to
Q is thenV4＝Cv4·ps；
Calculating the actual output flow q of the driving unit by the formula (1)iThe relation between (n) and the rotating speed n is shown as formula (2):
in the formula (2), Cq1、Cq2The correlation comprehensive coefficient of the actual output flow; cT1、Cv1、Cv21、Cv22、Cv3、Cv4The parameters are related to the flow loss of the plunger pump;
the total loss power P of the drive unit i of the constant power plunger variable pumpi WThe relation with the rotation speed n is shown in formula (3):
in the formula (3), the reaction mixture is,
the power loss of the plunger variable pump;
the loss power of the three-phase asynchronous motor; cw1、Cw2、Cw3Respectively, a constant power plunger variable pump driving unit structure and a load pressure ps iThe associated power loss integral coefficient;
step 1.1, inputting power P to driving unit i of constant power plunger variable pumpi input(n) is equal to the total power loss P of the drive uniti WAnd the output power Pi outputAnd (3) establishing an optimal rotating speed optimization model of the energy consumption target of the driving unit of the constant-power plunger variable pump according to the formula (4):
in the formula (4), qi(n) is the actual output flow of the constant power plunger variable pump driving unit when the rotating speed is n; k is a radical ofqThe value of the introduced flow coefficient is more than 1; k is a radical ofnThe value of the introduced plunger pump rotation speed coefficient is more than 1; n isi-minThe minimum allowable working rotating speed of the constant-power plunger variable pump driving unit is related to the type of the plunger pump; pi input(n) is the input power of the constant power plunger variable pump driving unit when the rotating speed is n;
step 1.2, outputting flow according to the working condition requirement of a given constant-power plunger variable pump driving unit i
And a load pressure ps iCan be controlled by constant powerThe optimal energy-saving target rotating speed of the constant-power plunger variable pump driving unit under the working condition requirement is solved by an optimal rotating speed optimization model formula (4) of the plunger variable pump driving unit energy consumption target
The energy-saving control method of the constant-power plunger variable pump set driving system is characterized by comprising the following steps of:
step 2.1, aiming at a constant power plunger variable pump set driving system formed by a constant power plunger variable pump driving unit consisting of (a + b) asynchronous motors with the same rated power and a swash plate type constant power axial plunger variable pump, the required output flow q of the constant power plunger variable pump set driving system is given according to the working condition characteristics of different stages of loadsneedOutput power PoutputAnd a load pressure psCalling a constant-power plunger variable pump driving units to be in a constant-power control operation state, calling b constant-power plunger variable pump driving units to be in an idle-load state operation, and distributing the mode as shown in a formula (5), namely:
in the formula (5), q (n)1) The rotating speed of a constant power plunger variable pump driving units in the constant power control running state is n1Total actual output flow rate; q. q.si(n1) For the i-th rotation speed n under constant power control1Actual output flow rate of the time; k is a radical ofqThe value of the introduced flow coefficient is more than 1;
the rotating speed of a constant power plunger variable pump driving units in the constant power control running state is n1Total actual input power in time; pi W(n1) The rotating speed of the ith constant-power plunger variable pump driving unit under constant-power control is n1Total power loss in time; pi output(n1) The rotating speed of the ith constant-power plunger variable pump driving unit under constant-power control is n1Actual output power in time;
step 2.2, the input power of the driving system of the constant-power plunger variable pump set is equal to the total loss power P of the driving system of the constant-power plunger variable pump setWAnd the output power PoutputSumming; the energy consumption target optimal rotating speed optimization model of the driving system of the constant-power plunger variable pump set is set in the joint vertical type (4) and the formula (5) as shown in the formula (6):
in the formula (6), n1The rotating speed of a constant power plunger variable pump driving units in a constant power control running state; n is2B constant power plunger variable pump driving unit rotating speeds in no-load running state; cqa1、Cqa2A is a relevant comprehensive coefficient of the actual output flow of the constant power plunger variable pump driving unit in a constant power control operation state; cwa1、Cwa2、Cwa3Respectively has a constant power plunger variable pump set driving system structure and a load pressure psThe associated power loss integral coefficient;
wherein,
step 2.3, outputting flow q according to the working condition requirement of a given constant-power plunger variable pump set driving systemneedAnd a load pressure psThe optimal energy-saving target rotating speed of a constant-power plunger variable pump driving units in a constant-power control running state under the condition requirement of the constant-power plunger variable pump driving system can be solved by an energy consumption target optimal rotating speed optimization model formula (6) of the constant-power plunger variable pump driving system
And b constant power plunger variable pump driving units in no-load running stateHigh energy-saving target rotating speed
Compared with the prior art, the invention has the beneficial effects that:
1. the variable-frequency speed regulation principle is applied to the constant-power plunger variable pump set driving system, and the parameters of the constant-power plunger variable pump driving unit and the constant-power plunger variable pump driving circuit are regulated according to the load working condition characteristics, so that the idle work output generated when an asynchronous motor-constant-power pump operates at a constant rotating speed is reduced, the no-load loss of the hydraulic driving unit is reduced, the output power is matched with the load required power as much as possible, and the variable-frequency speed regulation constant-power plunger variable pump driving system has important practical application value for optimizing the energy efficiency of the hydraulic driving unit.
2. According to the invention, the rotating speed of the asynchronous motor is regulated through the frequency converter, so that the reconstruction cost of medium and large hydraulic equipment is reduced, meanwhile, the relay switching control circuit can effectively avoid the reduction of the service life of the motor and a plunger pump caused by frequent starting and stopping of the motor, and the impact of the starting of a high-power motor on a power grid is reduced.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention, illustrate embodiments of the invention and together with the description serve to explain the invention and are not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of a constant power plunger variable displacement pump set drive system of the present invention;
FIG. 2 is a schematic diagram of a variable frequency speed control circuit of a constant power plunger variable pump set driving system; reference numbers in the figures: the system comprises a three-phase asynchronous motor 1, a constant-power variable pump 2, a constant-power plunger variable pump driving unit 3, a hydraulic cylinder 4 and a frequency converter 5.
Detailed Description
The invention will be further explained with reference to the drawings.
As the installed power of the medium and large hydraulic forming equipment is larger, as shown in figure 1, the constant power plunger variable pump set driving system comprises: the constant-power plunger variable pump driving unit comprises a constant-power plunger variable pump driving unit 3 consisting of a three-phase asynchronous motor 1 and a constant-power variable pump 2, a load hydraulic cylinder 4 driven by the constant-power plunger variable pump driving unit 3 and a frequency converter 5 used for adjusting the rotating speed of the three-phase asynchronous motor 1, wherein the number of the constant-power plunger variable pump driving units 3 is two or more, and a plurality of three-phase asynchronous motors-swash plate type constant-power axial plunger variable pumps are commonly adopted to work cooperatively to form the driving unit. According to different working condition requirements, plunger pumps with different quantities and powers are called to jointly complete output, and the rest plunger pumps are in a no-load running state. Therefore, for the constant-power plunger variable pump set driving system, at the same time, each motor-pump has two possible working states, namely constant-power control output or no-load operation, so that two different speed regulation requirements exist.
The energy-saving control method of the constant-power plunger variable pump set driving system in the embodiment is carried out according to the following steps:
in the formula (1), qiActually outputting the flow for the driving unit; q. q.sVThe total volume loss flow of the plunger pump; q. q.sTThe theoretical output flow of the plunger pump is obtained; q. q.sV1、qV2、qV3、qV4Respectively obtaining plunger pump compression volume loss flow, expansion volume loss flow, flow distribution pair leakage loss flow and sliding shoe pair leakage loss flow;
wherein, the theoretical output flow of the plunger pump
Order to
Then
Compressed volume loss flow
Order to
Q is thenV1＝Cv1N; volume loss flow of expansion
Order to
Q is thenV2＝Cv21psn-Cv22n; leakage loss flow of flow distribution pair
Order to
Q is thenV3＝Cv3·ps(ii) a Sliding shoe pair leakage loss flow
Order to
Q is thenV4＝Cv4·ps；
The actual drive unit is calculated from equation (1)Output flow qiThe relation between (n) and the rotating speed n is shown as formula (2):
in the formula (2), Cq1、Cq2The correlation comprehensive coefficient of the actual output flow; cT1、Cv1、Cv21、Cv22、Cv3、Cv4The parameters are related to the flow loss of the plunger pump;
the total loss power P of the drive unit i of the constant power plunger variable pumpi WThe relation with the rotation speed n is shown in formula (3):
in the formula (3), the reaction mixture is,
the power loss of the plunger variable pump;
the loss power of the three-phase asynchronous motor; cw1、Cw2、Cw3Respectively, a constant power plunger variable pump driving unit structure and a load pressure ps iThe associated power loss integral coefficient;
step 1.1, inputting power P to driving unit i of constant power plunger variable pumpi input(n) is equal to the total power loss P of the drive uniti WAnd the output power Pi outputAnd (3) establishing an optimal rotating speed optimization model of the energy consumption target of the driving unit of the constant-power plunger variable pump according to the formula (4):
in the formula (4), qi(n) is the number of revolutions nThe constant power plunger variable pump driving unit actually outputs flow; k is a radical ofqThe value of the introduced flow coefficient is more than 1; k is a radical ofnThe value of the introduced plunger pump rotation speed coefficient is more than 1; n isi-minThe minimum allowable working rotating speed of the constant-power plunger variable pump driving unit is related to the type of the plunger pump; pi input(n) is the input power of the constant power plunger variable pump driving unit when the rotating speed is n;
step 1.2, outputting flow according to the working condition requirement of a given constant-power plunger variable pump driving unit i
And a load pressure ps iThe optimal energy-saving target rotating speed of the constant-power plunger variable pump driving unit i under the working condition requirement can be solved by an energy consumption target optimal rotating speed optimization model formula (4) of the constant-power plunger variable pump driving unit
Step 2.1, aiming at a constant power plunger variable pump set driving system formed by a constant power plunger variable pump driving unit consisting of (a + b) asynchronous motors with the same rated power and a swash plate type constant power axial plunger variable pump, the required output flow q of the constant power plunger variable pump set driving system is given according to the working condition characteristics of different stages of loadsneedOutput power PoutputAnd a load pressure psCalling a constant-power plunger variable pump driving units to be in a constant-power control operation state, calling b constant-power plunger variable pump driving units to be in an idle-load state operation, and distributing the mode as shown in a formula (5), namely:
in the formula (5), q (n)1) The rotating speed of a constant power plunger variable pump driving units in the constant power control running state is n1Total actual output flow rate; q. q.si(n1) Is at a positionThe rotating speed of the ith constant-power plunger variable pump driving unit under constant-power control is n1Actual output flow rate of the time; k is a radical ofqThe value of the introduced flow coefficient is more than 1;
the rotating speed of a constant power plunger variable pump driving units in the constant power control running state is n1Total actual input power in time; pi W(n1) The rotating speed of the ith constant-power plunger variable pump driving unit under constant-power control is n1Total power loss in time; pi output(n1) The rotating speed of the ith constant-power plunger variable pump driving unit under constant-power control is n1Actual output power in time;
step 2.2, the input power of the driving system of the constant-power plunger variable pump set is equal to the total loss power P of the driving system of the constant-power plunger variable pump setWAnd the output power PoutputSumming; the energy consumption target optimal rotating speed optimization model of the driving system of the constant-power plunger variable pump set is set in the joint vertical type (4) and the formula (5) as shown in the formula (6):
in the formula (6), n1The rotating speed of a constant power plunger variable pump driving units in a constant power control running state; n is2B constant power plunger variable pump driving unit rotating speeds in no-load running state; cqa1、Cqa2The sum of the related comprehensive coefficients of the actual output flow of a constant power plunger variable pump driving units in a constant power control operation state; cwa1、Cwa2、Cwa3Respectively, a constant power plunger variable pump driving unit structure and a load pressure psThe sum of the associated loss power integral coefficients;
wherein,
step 2.3, outputting flow q according to the working condition requirement of a given constant-power plunger variable pump set driving systemneedAnd a load pressure psThe optimal energy-saving target rotating speed of a constant-power plunger variable pump driving units in a constant-power control running state under the condition requirement of the constant-power plunger variable pump driving system can be solved by an energy consumption target optimal rotating speed optimization model formula (6) of the constant-power plunger variable pump driving system
And b optimal energy-saving target rotating speeds of constant-power plunger variable pump driving units in no-load running state
Referring to fig. 2, a schematic diagram of a variable-frequency speed control circuit of a driving unit of a constant-power plunger variable pump set is designed in this embodiment, and for a constant-power plunger variable pump set driving system composed of (a + b) asynchronous motors with the same rated power and a swash plate type constant-power axial plunger variable pump, for different working stages, a plunger variable pump is called to output according to output flow and load pressure required by a working condition, and b plunger variable pumps are unloaded. Only according to the flow and load pressure required by working conditions, a asynchronous motors are connected into a circuit of the frequency converter 1 to
In operation, b asynchronous motors are connected into the line of the frequency converter 2 to
The energy-saving effect of the constant-power plunger variable pump set driving system is achieved.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (3)
1. An energy-saving control method for a constant-power plunger variable pump set driving system comprises the following steps: the constant-power plunger variable pump driving unit (3) consists of a three-phase asynchronous motor (1) and a constant-power plunger variable pump (2), the load hydraulic cylinder (4) is driven by the constant-power plunger variable pump driving unit (3), and the frequency converter (5) is used for adjusting the rotating speed of the three-phase asynchronous motor (1); the number of the constant-power plunger variable pump driving units (3) is two or more; the method is characterized in that: the load demand flow of the constant-power plunger variable pump set driving system is provided by all the constant-power plunger variable pump driving units together; the speed regulation control strategy of the constant-power plunger variable pump set driving system is as follows: according to the flow and pressure requirements of different stages of the load, calling different numbers of constant-power plunger variable pump driving units to be in constant-power control and no-load operation states respectively, establishing a rotation speed optimization model, calculating and obtaining the optimal energy-saving target rotation speed in the constant-power control and no-load operation states, and adjusting the rotation speed of a three-phase asynchronous motor of a constant-power plunger variable pump group driving system to the optimal energy-saving target rotation speed by using a frequency converter in each constant-power plunger variable pump driving unit.
2. The energy-saving control method of the constant-power plunger variable pump set driving system according to claim 1, which is characterized by comprising the following steps:
step 1, aiming at the ith constant-power plunger variable pump driving unit, setting the required output flow of the driving unit according to the working condition characteristics of different stages of loads
Output power
And load pressure
According to plunger pump workOperating principle, the output power of the drive unit
And the output flow qiThe relation is shown in formula (1):
in the formula (1), qiThe actual output flow of the constant power plunger variable pump driving unit is obtained; q. q.sVThe total volume loss flow of the plunger pump; q. q.sTThe theoretical output flow of the plunger pump is obtained; q. q.sV1、qV2、qV3、qV4Respectively obtaining plunger pump compression volume loss flow, expansion volume loss flow, flow distribution pair leakage loss flow and sliding shoe pair leakage loss flow;
calculating the actual output flow q of the constant-power plunger variable pump driving unit by the formula (1)iThe relation between (n) and the rotating speed n is shown as formula (2):
in the formula (2), Cq1、Cq2The correlation comprehensive coefficient of the actual output flow; cT1、Cv1、Cv21、Cv22、Cv3、Cv4The parameters are related to the flow loss of the plunger pump;
the total loss power P of the drive unit i of the constant power plunger variable pumpi WThe relation with the rotation speed n is shown in formula (3):
in the formula (3), the reaction mixture is,
for variable-displacement pumpsPower loss;
the loss power of the three-phase asynchronous motor; cw1、Cw2、Cw3Respectively, a constant power plunger variable pump driving unit structure and a load pressure ps iThe associated power loss integral coefficient;
step 1.1, inputting power P to driving unit i of constant power plunger variable pumpi input(n) is equal to the total power loss P of the drive uniti WAnd the output power Pi outputAnd (3) establishing an optimal rotating speed optimization model of the energy consumption target of the driving unit of the constant-power plunger variable pump according to the formula (4):
in the formula (4), qi(n) is the actual output flow of the constant power plunger variable pump driving unit when the rotating speed is n; k is a radical ofqThe value of the introduced flow coefficient is more than 1; k is a radical ofnThe value of the introduced plunger pump rotation speed coefficient is more than 1; n isi-minThe minimum allowable working rotating speed of the constant-power plunger variable pump driving unit is related to the type of the plunger pump; pi input(n) is the input power of the constant power plunger variable pump driving unit when the rotating speed is n;
step 1.2, outputting flow according to the working condition requirement of a given constant-power plunger variable pump driving unit i
And a load pressure ps iThe optimal energy-saving target rotating speed of the constant-power plunger variable pump driving unit i under the working condition requirement can be solved by an energy consumption target optimal rotating speed optimization model formula (4) of the constant-power plunger variable pump driving unit
3. The energy-saving control method of the constant-power plunger variable pump set driving system according to claim 1, which is characterized by comprising the following steps:
step 2.1, aiming at a constant power plunger variable pump set driving system formed by a constant power plunger variable pump driving unit consisting of (a + b) asynchronous motors with the same rated power and a swash plate type constant power axial plunger variable pump, the required output flow q of the constant power plunger variable pump set driving system is given according to the working condition characteristics of different stages of loadsneedOutput power PoutputAnd a load pressure psCalling a constant-power plunger variable pump driving units to be in a constant-power control operation state, calling b constant-power plunger variable pump driving units to be in an idle-load state operation, and distributing the mode as shown in a formula (5), namely:
in the formula (5), q (n)1) The rotating speed of a constant power plunger variable pump driving units in the constant power control running state is n1Total actual output flow rate; q. q.si(n1) The rotating speed of the ith constant-power plunger variable pump driving unit under constant-power control is n1Actual output flow rate of the time; k is a radical ofqThe value of the introduced flow coefficient is more than 1;
the rotating speed of a constant power plunger variable pump driving units in the constant power control running state is n1Total actual input power in time; pi W(n1) The rotating speed of the ith constant-power plunger variable pump driving unit under constant-power control is n1Total power loss in time; pi output(n1) The rotating speed of the ith constant-power plunger variable pump driving unit under constant-power control is n1Actual output power in time;
step 2.2, the input power of the driving system of the constant-power plunger variable pump set is equal to the total loss power P of the driving system of the constant-power plunger variable pump setWAnd the output power PoutputSumming; the energy consumption target optimal rotating speed optimization model of the driving system of the constant-power plunger variable pump set is set in the joint vertical type (4) and the formula (5) as shown in the formula (6):
in the formula (6), n1The rotating speed of a constant power plunger variable pump driving units in a constant power control running state; n is2B constant power plunger variable pump driving unit rotating speeds in no-load running state; cqa1、Cqa2The sum of the related comprehensive coefficients of the actual output flow of a constant power plunger variable pump driving units in a constant power control operation state; cwa1、Cwa2、Cwa3Respectively, a constant power plunger variable pump driving unit structure and a load pressure psThe sum of the associated loss power integral coefficients;
wherein,
step 2.3, outputting flow q according to the working condition requirement of a given constant-power plunger variable pump set driving systemneedAnd a load pressure psThe optimal energy-saving target rotating speed of a constant-power plunger variable pump driving units in a constant-power control running state under the condition requirement of the constant-power plunger variable pump driving system can be solved by an energy consumption target optimal rotating speed optimization model formula (6) of the constant-power plunger variable pump driving system
And b optimal energy-saving target rotating speeds of constant-power plunger variable pump driving units in no-load running state
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