CN113190978A - Motor model selection method and system in drainage pump station - Google Patents
Motor model selection method and system in drainage pump station Download PDFInfo
- Publication number
- CN113190978A CN113190978A CN202110393590.9A CN202110393590A CN113190978A CN 113190978 A CN113190978 A CN 113190978A CN 202110393590 A CN202110393590 A CN 202110393590A CN 113190978 A CN113190978 A CN 113190978A
- Authority
- CN
- China
- Prior art keywords
- motor
- power
- rated
- voltage
- pump station
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000010187 selection method Methods 0.000 title claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 43
- 238000005086 pumping Methods 0.000 claims abstract description 27
- 238000004364 calculation method Methods 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 21
- 230000009467 reduction Effects 0.000 claims description 11
- 238000013461 design Methods 0.000 claims description 10
- 239000007858 starting material Substances 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 238000003973 irrigation Methods 0.000 description 5
- 230000002262 irrigation Effects 0.000 description 5
- 238000011161 development Methods 0.000 description 4
- 230000018109 developmental process Effects 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 230000001360 synchronised effect Effects 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000012271 agricultural production Methods 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005520 electrodynamics Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000008447 perception Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q50/00—Information and communication technology [ICT] specially adapted for implementation of business processes of specific business sectors, e.g. utilities or tourism
- G06Q50/10—Services
- G06Q50/26—Government or public services
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2113/00—Details relating to the application field
- G06F2113/08—Fluids
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/40—Controlling or monitoring, e.g. of flood or hurricane; Forecasting, e.g. risk assessment or mapping
Landscapes
- Engineering & Computer Science (AREA)
- Business, Economics & Management (AREA)
- Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Tourism & Hospitality (AREA)
- Educational Administration (AREA)
- Human Resources & Organizations (AREA)
- Geometry (AREA)
- Development Economics (AREA)
- Evolutionary Computation (AREA)
- Computer Hardware Design (AREA)
- Health & Medical Sciences (AREA)
- Economics (AREA)
- General Health & Medical Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Marketing (AREA)
- Primary Health Care (AREA)
- Strategic Management (AREA)
- General Business, Economics & Management (AREA)
- Control Of Non-Positive-Displacement Pumps (AREA)
- Control Of Ac Motors In General (AREA)
- Motor And Converter Starters (AREA)
Abstract
The invention discloses a method and a system for selecting a type of a motor in a drainage pumping station, wherein the system comprises an axle power calculation module, a rated power selection module, a rated voltage selection module and a starting mode selection module, wherein the axle power calculation module is connected with the rated power selection module, and the rated power selection module is respectively connected with the rated voltage selection module and the starting mode selection module; the shaft power calculation module is used for calculating and acquiring the maximum shaft power of the water pump in the drainage pump station; the rated power selection module is used for selecting the rated power of the motor according to the maximum shaft power; the rated voltage selection module is used for selecting the rated voltage of the motor according to the rated power of the motor; and the starting mode selection module is used for selecting the starting mode of the motor according to the rated power of the motor. The invention provides a motor model selection scheme with relatively excellent operation reliability, technical performance and economical efficiency of the drainage pump station, so that the combination of the motor and the drainage pump station is more accurate, and the drainage pump station operates more efficiently.
Description
Technical Field
The invention belongs to the technical field of hydraulic engineering, and particularly relates to a method and a system for selecting a type of a motor in a drainage pump station.
Background
The problem of model selection of electromechanical equipment has been one of the key contents of the design of a flood drainage pump station, and the problem has direct influence on the capacity of the pump station for dealing with flood, waterlogging and drought. For some pump stations which are built earlier in China, due to the limitation of technical conditions at that time, the design and the type selection of part of main water pumps and main motors are unreasonable, and the pump stations work in low-efficiency areas for a long time. The depreciation age of large-scale electric power drainage and irrigation equipment is generally 25 years, the depreciation age of medium-sized and small-sized electric power drainage and irrigation equipment is generally 20 years, and the insulation performance of the medium-sized and small-sized electric power drainage and irrigation equipment is reduced and the operation efficiency is reduced due to overdimension. In order to ensure the normal operation of the whole pump station unit, improve the engineering benefit and ensure the sustainable development of the social economy in cities and towns in China, the redesign and model selection of electromechanical equipment such as a motor in a pump station becomes an important task at present.
Although the scholars at home and abroad make more researches on the problems of the pump station updating and the like, the researches on the problems of the motor in the pump station updating and transformation are relatively less due to the various indexes of the pump station system, so that how to better select the type of the generator used in the pump station is a technical problem which needs to be solved urgently.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method and a system for selecting the type of a motor in a drainage pumping station, which can ensure the high-efficiency operation of the pumping station.
A method for selecting a type of a motor in a drainage pumping station comprises the following steps:
s1, acquiring the maximum shaft power of the water pump in the drainage pumping station;
s2, selecting the rated power of the motor according to the maximum shaft power;
and S3, selecting the rated voltage of the motor and the starting mode of the motor according to the rated power of the motor.
Preferably, in step S1, the maximum shaft power calculation formula of the water pump in the drainage pumping station is as follows:
wherein Q represents the flow of the water pump, H represents the design lift of the water pump, gamma represents the weight of water, eta represents the efficiency of the water pump, and N represents the maximum shaft power of the operation of the water pump.
Preferably, step S2 specifically includes the following steps:
s2.1, calculating the calculated power of the motor according to the maximum shaft power of the water pump;
and S2.2, selecting the rated power of the motor according to the calculated power.
Preferably, the calculation formula of the calculated power of the motor in step S2.1 is:
PN＝KN，
wherein, PNThe calculated power of the motor is represented and K represents a safety factor.
Preferably, in step S2.1, K is 1.1 to 1.2 when N is less than 55kW, and K is 1.05 to 1.1 when N is not less than 55 kW.
Preferably, in step S2.2, the motor power rating P iseThe conditions are satisfied: pe>PN。
Preferably, in step S3, selecting the rated motor voltage according to the rated motor power includes:
when the rated power P of the motoreWhen the rated voltage of the motor is less than 200kW, the rated voltage of the motor is 6 kV;
when the rated power P of the motoreThe rated voltage of the motor is 10kV when the rated voltage is more than 315 kW.
Preferably, in step S3, selecting the motor starting method according to the rated power of the motor specifically includes:
when the rated power P of the motoreLess than 55kW, and when the rated power of the motor is less than the preset power, a full-voltage direct starting mode is adopted, and when the rated power P of the motor iseLess than 55kw, and when the rated power of the motor is greater than the preset power, a voltage reduction starting mode is adopted, wherein the preset power is 20-30% of the capacity of the transformer;
when the rated power of the motor meets 55kW and is less than or equal to PeWhen the power is less than 315kW, a pressure reduction starting mode is adopted;
when the rated power of the motor meets 315kW or lesseWhen the power is less than or equal to 1500kW, judging that the motor starting current, the motor running current and the pump station bus adopt a full-voltage direct starting modeAnd whether the line voltage drop meets the preset condition or not, if so, adopting a full-voltage direct starting mode, and if not, adopting a voltage-reduction starting mode.
Preferably, the preset conditions include:
the starting current of the motor is 5-7 times of the rated current of the motor;
the running current of the motor is 80-90% of the rated current of the motor;
the bus voltage drop of the pump station is less than 15% of the rated voltage of the bus of the pump station;
the rated current of the motor is calculated by the following formula:
wherein, IeIndicating motor rated current, PeIndicating motor rated power, UeRepresenting the rated voltage of the motor, cos phi representing the power factor and eta representing the efficiency;
the calculation formula of the bus voltage drop of the pump station is as follows:
wherein, the delta mu% represents the bus voltage drop of the pump station, U1Indicating the voltage of the head end of the bus of the pump station, U2Indicating the bus-bar end voltage, U, of the pump stationNAnd the rated voltage of the bus of the pump station is represented.
Correspondingly, the model selection system for the motor in the drainage pumping station comprises an axle power calculation module, a rated power selection module, a rated voltage selection module and a starting mode selection module, wherein the axle power calculation module is connected with the rated power selection module, and the rated power selection module is respectively connected with the rated voltage selection module and the starting mode selection module;
the shaft power calculation module is used for calculating and acquiring the maximum shaft power of the water pump in the drainage pump station;
the rated power selection module is used for selecting the rated power of the motor according to the maximum shaft power;
the rated voltage selection module is used for selecting the rated voltage of the motor according to the rated power of the motor;
and the starting mode selection module is used for selecting the starting mode of the motor according to the rated power of the motor.
The invention has the beneficial effects that: the motor model selection scheme with relatively excellent running reliability, technical performance and economical efficiency of the drainage pumping station is provided, the motor can be more accurately combined with the drainage pumping station, the normal water level running working point of the water pump is located in a high-efficiency area for a long time, and the running efficiency of the motor is higher. And a foundation is laid for the efficient and long-term operation of the pump station.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a method for selecting a type of a motor in a flood drainage pump station according to the invention;
FIG. 2 is a schematic structural diagram of a motor model selection system in a flood drainage pump station according to the invention;
FIG. 3 is a statistical chart of the rated power of a single motor of a pump station;
fig. 4 is a schematic diagram of a main wiring structure of the pumping station electric drainage station.
Detailed Description
The following description of the embodiments of the present invention is provided by way of specific examples, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
The first embodiment is as follows:
water conservancy is an important basic industry of national economy in Zhejiang province, flood drainage pump station engineering is an important component of water conservancy engineering, electromechanical irrigation and drainage engineering in Zhejiang province undertakes 41% of farmland irrigation and 70% of farmland flood drainage tasks, plays an extremely important role in water regulation, urban water supply and drainage, urban flood control and drainage, water environment improvement and the like, and plays a great role in labor-saving agricultural production in Zhejiang and national economy development. The invention researches the pump station engineering updating and transformation, namely, under the condition of comprehensively knowing the aging and risk of the Zhejiang province pump station, the model selection problem of electromechanical equipment in the pump station is tested and researched, in particular to a model selection allocation scheme of a motor, thereby laying a foundation for the sustainable development of the Zhejiang province pump station engineering in the future. At present, a motor in a medium-sized pump station in Zhejiang province mainly adopts an alternating-current asynchronous motor, and an alternating-current synchronous motor is applied to a large-sized pump station. As shown in fig. 3, the ac asynchronous motors used in the medium-sized pumping stations are mainly 55kW, 80kW, 130kW, and 155kW, and the ac synchronous motors used in the large-sized pumping stations are mainly 380kW and 630 kW.
The number of motors matched with 500, 700 and 900 axial-flow pumps commonly used in pumping stations in Zhejiang province is shown in Table 1. The 500 axial-flow pump mainly adopts a 55kW motor; the 700 axial-flow pump mainly adopts an 80kW motor; the 900 axial flow pump mainly adopts 130kW and 155kW motors.
TABLE 1 statistics table for motors matched with different axial-flow pumps of pumping station in Zhejiang province
However, based on the model selection condition of the electromechanical device in the current pump station, the comprehensive operation efficiency of the flood drainage pump station is not high, so referring to fig. 1, this embodiment provides a model selection method for a motor in a flood drainage pump station for the environment used by the flood drainage pump station in zhejiang, which includes the steps of:
s1, acquiring the maximum shaft power of the water pump in the drainage pumping station;
s2, selecting the rated power of the motor according to the maximum shaft power;
and S3, selecting the rated voltage of the motor and the starting mode of the motor according to the rated power of the motor.
Specifically, the method comprises the following steps:
in step S1, the maximum shaft power calculation formula of the water pump in the drainage pumping station is:
wherein Q represents the flow of the water pump, H represents the design lift of the water pump, gamma represents the weight of water, eta represents the efficiency of the water pump, and N represents the maximum shaft power of the operation of the water pump.
Step S2 specifically includes the following steps:
s2.1, calculating the calculated power of the motor according to the maximum shaft power of the water pump;
and S2.2, selecting the rated power of the motor according to the calculated power.
The formula for calculating the power of the motor in step S2.1 is:
PN＝KN，
wherein, PNThe calculated power of the motor is represented and K represents a safety factor.
In step S2.1, K is 1.1 to 1.2 when N is less than 55kW, and K is 1.05 to 1.1 when N is greater than 55 kW.
In step S2.2, the rated power P of the motoreThe conditions are satisfied: pe>PN。
In step S3, selecting the rated motor voltage according to the rated motor power includes:
when the rated power P of the motoreWhen the rated voltage of the motor is less than 200kW, 6kV (low-voltage motor) is adopted;
when the rated power P of the motoreWhen the rated voltage of the motor is more than 315kW, 10kV (high-voltage motor) is adopted;
when the rated power of the motor meets 200 ≤ PeWhen the pressure is less than or equal to 315kw, the selection is lowThe voltage or the high-voltage motor is determined by technical and economic comparison.
The same motor has larger difference in manufacturing cost due to different rated voltages and power factors, and the manufacturing cost of the motor is generally in direct proportion to the rated voltage; for asynchronous motors, it is economical to use a lower rated voltage when the single machine power is less than 200kW, and preferably 10kV for low-voltage motors and high-voltage motors with similar technical and economic conditions when the single machine power is greater than 315 kW.
The production technology of high voltage motors is well established and the production costs of 6kV and 10kV alternating current asynchronous motors are almost equal, so that the market prices are not very different. If the voltage is between 6kV and 10kV, 10kV is recommended to be selected in research. Because 6kV electrical equipment manufacturers are few, later maintenance is difficult. In addition, the rural power supply grid mostly takes 10kV and 35kV as the main voltage class, and if a 10kV alternating current asynchronous motor is selected, a main transformer is omitted in the wiring scheme of the power supply system, so that the investment is saved, and the power supply link is simplified. For example, a pumping station of the horizontal mountain lake in Taizhou city of Zhejiang province is directly supplied with power of electric equipment by a power grid, so that the advantage of infinite power grid power supply can be realized, the circuit is simplified, the switches are reduced, the land is saved, and the investment is saved. As shown in figure 4, the main connection of the pump station can be known from the main electrical connection, the power supply of 7 high-voltage motors is realized through a high-voltage power distribution cabinet and a high-voltage control cabinet, the circuit is clear, simple and practical, the control links are few, and the maintenance amount is also small.
In step S3, selecting a motor start mode according to the motor rated power includes:
when the rated power P of the motoreLess than 55kW, and when the rated power of the motor is less than the preset power, a full-voltage direct starting mode is adopted, and when the rated power P of the motor iseLess than 55kw, and when the rated power of the motor is greater than the preset power, a voltage reduction starting mode is adopted, wherein the preset power is 20-30% of the capacity of the transformer;
when the rated power of the motor meets 55kW and is less than or equal to PeWhen the power is less than 315kW, a voltage reduction starting mode, specifically a soft starting mode is adopted;
when the rated power of the motor meets 315kW or lesseWhen being less than or equal to 1500kW, when judging to adopt full voltage direct start mode, whether motor starting current, motor running current and pump station bus voltage drop accord with the preset condition, if all accord with then adopt full voltage direct start mode, if any is not accord with then adopt the step-down start mode.
The preset conditions include:
the starting current of the motor is 5-7 times of the rated current of the motor;
the running current of the motor is 80-90% of the rated current of the motor;
the bus voltage drop of the pump station is less than 15% of the rated voltage of the bus of the pump station;
the rated current of the motor is calculated by the following formula:
wherein, IeIndicating motor rated current, PeIndicating motor rated power, UeRepresenting the rated voltage of the motor, cos phi representing the power factor and eta representing the efficiency;
the calculation formula of the bus voltage drop of the pump station is as follows:
wherein, the delta mu% represents the bus voltage drop of the pump station, U1Indicating the voltage of the head end of the bus of the pump station, U2Indicating the bus-bar end voltage, U, of the pump stationNIndicating pump station bus rated voltage, UNTypically 380V.
Generally, the starting mode of the motor can be divided into the following modes according to the parameters of the power grid and the conditions of the geographical economic environment of the region: the method comprises the steps of direct starting, star-delta step-down starting, one-time series resistance starting, autotransformer step-down starting, magnetic control type step-down starting and variable frequency speed regulation starting.
Full pressure direct start. The current required when the motor is started is 4-8 times of the nominal current, the starting torque is 0.5-1.5 times of the nominal torque, but the starting current multiple is high, a high torque peak value can be generated, and large impact can be generated on a water pump, so that the starting mode is only suitable for starting the motor with smaller power.
The star triangle is started after reducing the voltage. The starting current is 1.8-2.6 times of the nominal current. Although the current of the star-delta step-down starting can be greatly reduced during starting, the motor is provided with a plurality of leading-out ports, and three star-delta switching can be completed only after the current is divided by breaking the current contactor. The contact of the contactor deposits carbon after being started for many times, so that operators need to understand the knowledge of electricians to clean and maintain the contactor to ensure the contactor to normally operate, and the mode is generally only suitable for no-load starting of the motor or low-resistance torque.
A series resistor is started. One-time series resistor starting is variable resistor starting under the condition of stator side series, and generally adopts thermal change resistor or liquid resistance starting. This starting mode is an energy-consuming, pressure-reducing starting mode, since it consumes a large amount of electric energy during starting. Different from star-delta voltage reduction starting, the frequency of one-time series resistance starting is less, but the influence of the external environment is larger, the control capability is weakened, the starting current ratio is larger, the load is often greatly influenced, the size and the weight of the unit are larger, and once maintenance is needed, the workload is also larger. Its advantages are simple technology, low cost and no harmonic wave.
And starting by self-coupling voltage reduction. The auto-transformer is connected in series to the stator winding of the motor to reduce the starting voltage, and the starter is cut off after the starting is finished. The self-coupling voltage-reduction starting mode has the characteristics that the required starting current is small, so that the self-coupling voltage-reduction starting mode is more suitable for the state of larger resisting torque, but has the defects that the torque is increased suddenly in the starting process, the intention is generated, and the weight of the whole unit is also larger.
And starting the magnetic control type voltage reduction. The magnetically controlled step-down start is to connect a saturable reactor in series at the stator side, and to control the saturation degree of an iron core by changing the direct-current exciting current, thereby changing the alternating-current reactance value. When the iron core is saturated, the alternating current reactance is very small, so that the voltage obtained by the motor is high; the iron core is not saturated, the alternating current resistance is large, so that the voltage of the stator is reduced, and the voltage reduction starting is realized. The magnetic control type voltage reduction starting has better controllability and constant current property, but the voltage regulating range is smaller, so that larger torque sudden change still exists in the starting process, the starting current is larger, and in addition, the equipment is huge and heavy.
And (4) intelligent soft start. The soft starting mode is that three-phase positive and negative parallel thyristors are used as a voltage regulator and are connected between a power supply and a motor stator. By adjusting the trigger angle of the trigger pulse on the thyristor, the voltage of the motor can be increased smoothly and orderly, and finally the motor starts to accelerate and start normally. At the moment, the motor can realize smooth starting on the mechanical performance of rated voltage, so that starting current is reduced, and the phenomenon of tripping caused by over-speed starting is avoided. When the motor can reach a certain rotating speed, the soft starter automatically uses the bypass contactor to replace the thyristor which has completed the task, so that rated voltage is provided for the normal operation of the motor, the heat loss of the thyristor is reduced, the service life of the soft starter is prolonged, the working efficiency of the soft starter can be improved, and harmonic pollution of a power grid is avoided. Along with the development of economy, intelligent soft start can also be according to the big or small automatically regulated of electric current and voltage, the effectual cost of labor that has reduced, if the soft parking function just carries out opposite design with soft parking and soft start process, can make former starting voltage slowly step down, the revolution drops to zero gradually to effectively avoided the torque impact that free parking arouses, reduced the impact of water hammer to the water pump.
According to the pump station design specification, a full-voltage direct starting mode is preferably adopted for the unit, but the voltage drop of a bus is not more than 15% of the rated voltage. Generally, a pump station motor with a single machine rated power of less than 55kW recommends a full-voltage direct starting mode under the condition of power supply capacity allowance, and meanwhile, the motor capacity is less than 20% -30% of the transformer capacity; a pump station low-voltage motor with a single machine rated power of more than 55kW recommends a step-down starting mode (because the cost of the existing soft starter is greatly reduced, a soft starting mode is recommended to be used for a motor needing step-down starting); a pump station high-voltage motor with a single machine rated power of 315 kW-1500 kW recommends a full-voltage direct starting mode (however, calculation of starting current and voltage loss is required, if the pump station design specification is met, full-voltage direct starting can be adopted, and if the pump station design specification is not met, reduced-voltage starting is required).
As shown in fig. 4, the main wiring of the power distribution station of the transverse mountain lake pumping station adopts a direct power supply full-voltage starting mode, and has the advantages that: the method is not limited by a transformer, and the motor is directly connected with a power grid, so that the power grid can be regarded as infinite large capacity (according to experience, the maximum power of the squirrel-cage asynchronous motor which is allowed to be directly started is not more than 20-30% of the capacity of a power transformer); secondly, the rated current of the high-voltage motor is small, the motor cannot be overheated, and the generated electrodynamic force is insufficient to deform the end part of the winding; thirdly, direct starting is carried out without an intermediate link; fourthly, when the power supply voltage is in the range of plus or minus 5 percent, the direct start can be realized (the starting torque and the maximum torque are in direct proportion to the square of the voltage), and the like.
In order to ensure reliable starting, a pump station is combined according to the characteristics of various starting modes, and three starting control modes, namely automatic, electric and manual, are suggested for the pump station; the third manual mode is that under the condition that the former two modes are invalid, the motor is started in a short circuit mode (the contactor and the decompression starter can be used and cannot be used, the short circuit is realized, and the reliability of the pump station can be greatly improved by adopting the setting of the three starting modes as long as the circuit breaker can bear the load.
Common protection classes for motors are IP23, IP44, IP54, IP55, IP56, IP 65. According to the environment of the drainage pumping station in Zhejiang province, the motor with the protection level above IP23 can meet the requirement.
The beneficial effect of this embodiment does:
the motor model selection for updating and transforming the pump station can be divided into a synchronous motor, an asynchronous motor and a mixed loading of the synchronous motor and the asynchronous motor. The small and medium-sized drainage pumping stations usually adopt asynchronous motors, and the general selection basis is as follows: (1) the working performance of the motor needs to meet the working requirement of the pump; (2) the running efficiency of the motor is high; (3) the influence on the power grid is small when the motor is started and normally operates; (4) the secondary wiring of the motor, such as control, measurement, protection signals and the like, is simple and reliable as much as possible, and is convenient to maintain; (5) the investment cost of the whole station-tying engineering is low, and the like. However, because the water pump in the Zhejiang drainage pumping station is mainly an axial flow pump, although a small and medium-sized asynchronous motor is also adopted, the pumping station has the characteristics of large quantity, multiple models, no excitation system, simple structure, small operation and maintenance amount and the like, and a reactive power compensation device needs to be arranged due to low efficiency and power factor, relatively low stability and anti-interference capability and the like. If the power factor is compensated to 0.95 from 0.85, the compensation rate is 25 percent; if the compensation rate is 0.92, the compensation rate can also reach 15 percent. The compensation mode adopts static capacitor compensation and phase modulator compensation, and the compensation effect can be increased by matching with the corresponding number of units. The motor and the water pump are reasonably matched and selected, and the operating working condition points of the pump and the motor can be kept in a high-efficiency area, so that energy is saved; if the model is improperly selected, no allowance exists, the process requirement cannot be met, and if the allowance is too large, the low operation efficiency and the energy waste can be caused. Therefore, in the motor model selection in the technical scheme of the embodiment, firstly, the maximum shaft power calculation is adopted for selecting the motor in the pump station transformation, secondly, the rated power of the motor is selected according to the calculated power of the motor, the motor can be ensured to run uninterruptedly under the power, and finally, the rated voltage of the motor is selected according to the rated power of the motor, and the like so as to determine the starting mode of the motor. Through this technical scheme can make the motor combine more accurately with the drainage pumping station, make water pump normal water level operation operating point be located the high efficiency district for a long time, the operating efficiency of motor also can be higher.
Example two:
referring to fig. 2, the embodiment provides a model selection system for a motor in a drainage pumping station, which includes an axle power calculation module, a rated power selection module, a rated voltage selection module, and a starting mode selection module, wherein the axle power calculation module is connected with the rated power selection module, and the rated power selection module is respectively connected with the rated voltage selection module and the starting mode selection module;
the shaft power calculation module is used for calculating and acquiring the maximum shaft power of the water pump in the drainage pump station;
the rated power selection module is used for selecting the rated power of the motor according to the maximum shaft power;
the rated voltage selection module is used for selecting the rated voltage of the motor according to the rated power of the motor;
and the starting mode selection module is used for selecting the starting mode of the motor according to the rated power of the motor.
It should be noted that, similar to the embodiment, the semantic segmentation system based on dual-feature fusion for internet of things perception provided in this embodiment is not described herein in detail.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention by those skilled in the art should fall within the protection scope of the present invention without departing from the design spirit of the present invention.
Claims (10)
1. A method for selecting a type of a motor in a drainage pumping station is characterized by comprising the following steps:
s1, acquiring the maximum shaft power of the water pump in the drainage pumping station;
s2, selecting the rated power of the motor according to the maximum shaft power;
and S3, selecting the rated voltage of the motor and the starting mode of the motor according to the rated power of the motor.
2. The method for selecting the type of the motor in the flood drainage pump station according to claim 1, wherein in step S1, the maximum shaft power calculation formula of the operation of the water pump in the flood drainage pump station is as follows:
wherein Q represents the flow of the water pump, H represents the design lift of the water pump, gamma represents the weight of water, eta represents the efficiency of the water pump, and N represents the maximum shaft power of the operation of the water pump.
3. The method for model selection of the motor in the flood drainage pump station according to claim 2, wherein the step S2 specifically comprises the following steps:
s2.1, calculating the calculated power of the motor according to the maximum shaft power of the water pump;
and S2.2, selecting the rated power of the motor according to the calculated power.
4. The method for model selection of the motor in the flood drainage pump station according to claim 3, wherein the calculation formula of the calculated power of the motor in the step S2.1 is as follows:
PN＝KN，
wherein, PNThe calculated power of the motor is represented and K represents a safety factor.
5. The model selection method for the electric motor in the flood drainage pump station according to claim 4, wherein in the step S2.1, when N is less than 55kW, K is 1.1-1.2, and when N > is greater than or equal to 55kW, K is 1.05-1.1.
6. The method for model selection of the motor in the flood drainage pump station according to claim 4, wherein in the step S2.2, the rated power P of the motoreThe conditions are satisfied: pe>PN。
7. The method for selecting the type of the motor in the flood drainage pump station according to claim 4, wherein in the step S3, the step of selecting the rated voltage of the motor according to the rated power of the motor specifically comprises:
when the rated power P of the motoreWhen the rated voltage of the motor is less than 200kW, the rated voltage of the motor is 6 kV;
when the rated power P of the motoreThe rated voltage of the motor is 10kV when the rated voltage is more than 315 kW.
8. The method for selecting the type of the motor in the flood drainage pump station according to claim 4, wherein in the step S3, the step of selecting the starting mode of the motor according to the rated power of the motor specifically comprises the following steps:
when the rated power P of the motoreLess than 55kW, and when the rated power of the motor is less than the preset power, a full-voltage direct starting mode is adopted, and when the rated power P of the motor iseLess than 55kw, and when the rated power of the motor is greater than the preset power, a voltage reduction starting mode is adopted, wherein the preset power is 20-30% of the capacity of the transformer;
when the rated power of the motor meets 55kW and is less than or equal to PeWhen the power is less than 315kW, a pressure reduction starting mode is adopted;
when the rated power of the motor meets 315kW or lesseWhen being less than or equal to 1500kW, when judging to adopt full voltage direct start mode, whether motor starting current, motor running current and pump station bus voltage drop accord with the preset condition, if all accord with then adopt full voltage direct start mode, if any is not accord with then adopt the step-down start mode.
9. The method for model selection of the motor in the flood drainage pump station according to claim 8, wherein the preset conditions comprise:
the starting current of the motor is 5-7 times of the rated current of the motor;
the running current of the motor is 80-90% of the rated current of the motor;
the bus voltage drop of the pump station is less than 15% of the rated voltage of the bus of the pump station;
the rated current of the motor is calculated by the following formula:
wherein, IeIndicating motor rated current, PeIndicating motor rated power, UeRepresenting the rated voltage of the motor, cos phi representing the power factor and eta representing the efficiency;
the calculation formula of the bus voltage drop of the pump station is as follows:
wherein, the delta mu% represents the bus voltage drop of the pump station, U1Indicating the voltage of the head end of the bus of the pump station, U2Indicating the bus-bar end voltage, U, of the pump stationNAnd the rated voltage of the bus of the pump station is represented.
10. A model selection system for a motor in a drainage pumping station is characterized by comprising an axle power calculation module, a rated power selection module, a rated voltage selection module and a starting mode selection module, wherein the axle power calculation module is connected with the rated power selection module, and the rated power selection module is respectively connected with the rated voltage selection module and the starting mode selection module;
the shaft power calculation module is used for calculating and acquiring the maximum shaft power of the water pump in the drainage pump station;
the rated power selection module is used for selecting the rated power of the motor according to the maximum shaft power;
the rated voltage selection module is used for selecting the rated voltage of the motor according to the rated power of the motor;
and the starting mode selection module is used for selecting the starting mode of the motor according to the rated power of the motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110393590.9A CN113190978B (en) | 2021-04-13 | 2021-04-13 | Motor type selection method and system in drainage pump station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110393590.9A CN113190978B (en) | 2021-04-13 | 2021-04-13 | Motor type selection method and system in drainage pump station |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113190978A true CN113190978A (en) | 2021-07-30 |
| CN113190978B CN113190978B (en) | 2024-04-05 |
Family
ID=76975582
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110393590.9A Active CN113190978B (en) | 2021-04-13 | 2021-04-13 | Motor type selection method and system in drainage pump station |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113190978B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113944639A (en) * | 2021-10-15 | 2022-01-18 | 扬州大学 | Single unit control method of blade full-regulation pump station based on R-IPSO algorithm and considering start-up and shutdown loss |
| CN114033659A (en) * | 2021-11-12 | 2022-02-11 | 四川野马汽车股份有限公司 | Water-cooled motor system-based electric vehicle water pump model selection method and device |
| WO2023201894A1 (en) * | 2022-04-20 | 2023-10-26 | 广东高标电子科技有限公司 | Motor control method and electric vehicle |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108832864A (en) * | 2018-04-09 | 2018-11-16 | 上海勘测设计研究院有限公司 | A kind of drainage pumping stations asynchronous motor reactive compensation analysis calculation method |
-
2021
- 2021-04-13 CN CN202110393590.9A patent/CN113190978B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108832864A (en) * | 2018-04-09 | 2018-11-16 | 上海勘测设计研究院有限公司 | A kind of drainage pumping stations asynchronous motor reactive compensation analysis calculation method |
Non-Patent Citations (3)
| Title |
|---|
| 冯小燕等: "大中型排涝泵站电动机选型比较", 吉林水利, no. 10, pages 22 - 24 * |
| 冯晓莉等: "调水兼顾排涝的贯流泵站机组及工况调节方式定量选择", 水利发电学报, vol. 31, no. 6, pages 271 - 276 * |
| 沈轶君: "排水泵站异步电动机起动方式浅谈", 中国市政工程, no. 4, pages 42 - 44 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113944639A (en) * | 2021-10-15 | 2022-01-18 | 扬州大学 | Single unit control method of blade full-regulation pump station based on R-IPSO algorithm and considering start-up and shutdown loss |
| CN113944639B (en) * | 2021-10-15 | 2023-10-13 | 扬州大学 | R-IPSO algorithm-based single-unit group control method for blade full-adjustment pump station considering start-stop loss |
| CN114033659A (en) * | 2021-11-12 | 2022-02-11 | 四川野马汽车股份有限公司 | Water-cooled motor system-based electric vehicle water pump model selection method and device |
| WO2023201894A1 (en) * | 2022-04-20 | 2023-10-26 | 广东高标电子科技有限公司 | Motor control method and electric vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113190978B (en) | 2024-04-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113190978B (en) | Motor type selection method and system in drainage pump station | |
| CN102055207B (en) | Intelligent power control unit for low voltage ride through and application thereof | |
| CN103138674B (en) | High-power brushless double-fed motor variable frequency speed control system and control method | |
| CN104578060B (en) | Method for selecting black-start diesel engine of SFC self-start gas turbine set | |
| CN103199526A (en) | Short circuit power frequency electrical quantity calculating method for power system comprising doubly-fed induction generator | |
| CN103795081A (en) | Method for controlling low voltage ride-through of direct-drive type wind power system | |
| CN106026122A (en) | Integrated asynchronous excitation phase modifier and reactive compensation and active balance method thereof | |
| CN113991731B (en) | Black-start method for large-scale gas turbine energy storage system | |
| Nath et al. | The modeling and simulation of wind energy based power system using MATLAB | |
| CN106443135A (en) | Hybrid wind power plant output power frequency short-circuit current calculation method | |
| CN201118522Y (en) | Intelligent controller | |
| CN216929601U (en) | Black start system of large-scale gas turbine energy storage system | |
| CN202817775U (en) | Voltage regulating and capacitance regulating type integrated reactive power compensation device | |
| CN202433446U (en) | Function test platform for 1.5MW doubly-fed wind power converter | |
| Liu et al. | Research on low voltage ride through capability of wind farms grid integration using VSC-HVDC | |
| Min et al. | Analysis of the influence of installing synchronous condenser in HVDC inverter station to receiving-end grid | |
| CN201966629U (en) | Low voltage ride through intelligent power control unit | |
| CN111711200A (en) | Power grid synchronous phase modulator system | |
| CN115528723B (en) | Flexible direct-current constant-voltage control mode parameter design method and system | |
| Patil | Improvement of power quality considering voltage stability in grid connected system by FACTS devices | |
| RU53081U1 (en) | POWER SUPPLY SYSTEM | |
| CN1740559A (en) | Combined wind energy and hydraulic power varying generator | |
| Zhao et al. | Aggregation model of variable frequency motors and the analysis of active power and reactive power demand under transient state | |
| CN101030744A (en) | Starter of oil-submersible electric pump | |
| Zheng et al. | Variable Frequency Starting Strategy for Pumped Storage Unit Based on Flexible Excitation System |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |