CN107327397B - Electric control system for monitoring and improving starting performance of submersible electric pump - Google Patents
Electric control system for monitoring and improving starting performance of submersible electric pump Download PDFInfo
- Publication number
- CN107327397B CN107327397B CN201710758704.9A CN201710758704A CN107327397B CN 107327397 B CN107327397 B CN 107327397B CN 201710758704 A CN201710758704 A CN 201710758704A CN 107327397 B CN107327397 B CN 107327397B
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- electric pump
- submersible electric
- starting
- motor
- controller
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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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- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Non-Positive-Displacement Pumps (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
The invention relates to a control of the starting process of a submersible pump, which is characterized in that in the starting process of the submersible pump, when the starting torque of the submersible pump is close to a load resisting torque and the submersible pump is difficult to start, a matched capacitor is put into a loop along the polarity, so that the capacitor and the submersible pump in the starting state form an approximate LC oscillating loop, the voltage of the power receiving end of a motor is improved, the load resisting torque is overcome, and the motor is started safely. The invention effectively ensures the running safety of the transformer while improving the starting torque of the motor by improving the traditional starting mode.
Description
Technical Field
The invention relates to a control system for starting a submersible electric pump, in particular to an electric control system for monitoring and improving the starting performance of the submersible electric pump.
Background
At present, the starting modes of the electric submersible pumps commonly used in the market are divided into two main categories: one type is a direct start. The starting mode usually needs the capacity of the transformer to be 4 times larger than the rated capacity of the submersible electric pump, otherwise, when the current on a line exceeds the allowable current limit value of the transformer, the transformer is tripped, and the starting cannot be smoothly carried out. The operation occasion of the submersible electric pump is generally difficult to meet, and particularly the requirement is difficult to meet by a high-power submersible electric pump.
The second type is a step-down start, and the traditional step-down start modes are divided into three types: the first is stator series resistance or reactance starting; the second is the step-down starting of the autotransformer; the third is soft starter buck start.
The three starting modes have the common characteristic of reducing the voltage of the power receiving end of the submersible electric pump, so that the following defects exist: the drop in voltage of the electric motor for submersible pumps during starting causes a considerable reduction in the starting torque, which is known from the characteristics of electric motors: a one-time drop of voltage will causeThe motor starting torque decreases quadratically. The typical starting performance curve of a submersible electric pump is shown in fig. 1, in which: Ist/IN-starting current multiple of submersible electric pump at rated voltage; Ist'/IN-the starting current multiple of the submersible electric pump after depressurization; Tst/TN-starting torque multiple of submersible electric pump at rated voltage; Tst'/TN-the starting torque multiple of the submersible electric pump after depressurization; Tp/TN-load water pump drag torque multiple; s-slip ratio of motor for submersible electric pump.
As can be appreciated from fig. 1: when the starting performance curve of the submersible pump and the resistance torque curve of the load water pump intersect at the point A, namely the starting torque of the motor is lower than the resistance torque of the water pump, the rotating speed of the motor stays at the moment, the motor generates a buzzing sound, the rotating speed does not rise any more, and the rated rotating speed cannot be reached. At this time, the motor cannot start up, and the start fails.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides an electric control system 2 for monitoring and improving the starting performance of a submersible electric pump, wherein the electric control system 2 greatly improves the starting performance of the submersible electric pump 1, improves the starting torque of the submersible electric pump 1 while not influencing the running quality of a power grid 4, ensures the smooth starting of the submersible electric pump 1, and reasonably switches a capacitor 5 to the running mode of the submersible electric pump 1 after the starting process is finished. The operation safety of the transformer 3 and the starting reliability of the submersible pump are improved.
In order to achieve the purpose, the invention adopts the technical scheme that: an electric control system for monitoring and improving the starting performance of a submersible electric pump comprises: in the starting process of the submersible electric pump 1, a motor rotating speed velometer is arranged on a rotor of the submersible electric pump 1 matched with a motor, the acceleration of the rotating speed is monitored, and when the value is detected to be smaller than a certain fixed value, the starting torque of the submersible electric pump 1 is close to the load resisting torque, and the starting difficulty of the submersible electric pump 1 is predicted. According to the characteristic when the submersible electric pump 1 is started, the power factor is less than or equal to 0.2, the motor matched with the submersible electric pump is approximately considered to be inductive at the moment, then the matched capacitor 6 is put into the loop to form an approximate LC oscillation loop, and meanwhile, the capacitor 6 is put into the loop under the condition of a forward polarity phase to ensure the discharge state of the capacitor 6, so that the voltage of the power receiving end of the submersible electric pump 1 is improved, namely the starting torque of the submersible electric pump 1 is improved, the resistance moment of a load water pump is overcome, and the safe starting of the submersible electric pump 1 is realized. After the starting process is finished, the capacitor 6 is effectively switched in time, and the operation safety of the power grid 4 is ensured.
The rotation speed change measuring device in the electric control system adopts any one of a magnetoelectric sensor, a tachogenerator and a rotary encoder, and is arranged on a rotor of a matched motor.
The matched capacitor 6 in the electric control system calculates the inductance according to the starting performance of the motor, and then reasonably calculates and matches the capacitance value to form an approximate LC oscillating circuit.
The forward phase in the electric control system refers to a state where the capacitor 6 is discharged in the approximate LC oscillating circuit.
The power receiving end of the submersible electric pump in the electric control system refers to a cable outlet end of the submersible electric pump, namely a point B in fig. 2.
The electronic control system is controlled by a controller 10.
According to the technical scheme, the beneficial effects of the invention are as follows:
the electric control system improves the starting torque of the submersible electric pump 1, exceeds the load resisting torque thereof, and improves the starting reliability of the submersible electric pump. The electric control system utilizes the LC oscillation circuit principle to increase the voltage of the B point at the power receiving end of the submersible electric pump when the starting torque of the submersible electric pump 1 cannot overcome the resisting torque of the load water pump, so that the starting torque of the submersible electric pump 1 is increased, the resisting torque of the load water pump is overcome, and the effect of safely and reliably starting the submersible electric pump 1 is achieved.
Description of the drawings:
FIG. 1 is a typical starting performance curve and load pump drag torque curve for an electric submersible pump;
FIG. 2 is a diagram of the location of the present invention in a power grid;
wherein: the system comprises a submersible electric pump 1, an electric control system for monitoring and improving the starting performance of the submersible electric pump 2, a transformer 3, a power supply grid 4, a switching capacitor controller 5, a matching capacitor 6, a soft starter 7, a comprehensive protector 8, a motor speed measurer 9 and a controller 10.
Detailed Description
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention. The conditions used in the examples may be further adjusted according to the manufacturer's conditions, and the unexplained conditions are generally conventional experimental conditions.
Examples
The utility model provides an electrical system for monitoring, promotion submerged motor pump starting performance, includes power supply electric wire netting 4, transformer 3, switching capacitance controller 5, matches electric capacity 6, submerged motor pump 1, motor speed velometer 9, controller 10, the controller can calculate out the differential value dn/dt of rotational speed acceleration, and when the differential value of rotational speed acceleration was less than definite value C, the controller started switching capacitance controller, will match electric capacity and throw into the return circuit under the polarity phase condition, and when submerged motor pump start-up completion back, the controller disconnection switching capacitance controller switch, definite value C is the value of motor load resistance torque.
Specifically, the electric control system further comprises a soft starter 7 and a comprehensive protector 8, wherein the soft starter is arranged behind the transformer and in front of the switching capacitor controller, and the comprehensive protector is arranged behind the switching capacitor controller and in front of the submersible electric pump.
Specifically, the motor speed measurer is any one of a magnetoelectric sensor, a tachogenerator and a rotary encoder, and the mounting part is on a rotor of a matched motor.
Specifically, the controller is a DSP controller.
The working principle is as follows: when the submersible electric pump 1 is started, the differential quantity dn/dt of the rotating speed acceleration is monitored, when the differential quantity is monitored to be smaller than a certain value C, C is the value of load resistance torque of a motor, namely dn/dt < C, which indicates that the torque of the submersible electric pump 1 is close to the load water pump resistance torque at the moment and the starting is difficult, a capacitor 6 matched with the submersible electric pump is calculated in a loop along the polarity, the current in an approximate LC oscillation loop is increased at the moment, the voltage of a point B at the power receiving end of the submersible electric pump 1 is increased, according to the characteristic of the motor matched with the submersible electric pump 1, the voltage of the point B at the power receiving end is linearly increased, the quadratic power of the starting torque of the submersible electric pump 1 is increased, so that the starting torque of the submersible electric pump 1 is increased, the resistance torque of the load water pump is overcome, and the current in a superior power supply line is not increased, and after the submersible electric pump is started, the controller switches off the switch of the switched capacitor controller.
Claims (1)
1. An electric control system for monitoring and improving the starting performance of a submersible electric pump is characterized in that: the controller calculates a differential value dn/dt of rotating speed acceleration, when the differential value of the rotating speed acceleration is smaller than a fixed value C, the controller starts the switching capacitor controller, the matching capacitor is put into a loop under a forward polarity phase condition, after the submersible electric pump is started, the controller switches off a switch of the switching capacitor controller, and the fixed value C is a value of load resistance torque of the motor;
the electric control system further comprises a soft starter and a comprehensive protector, wherein the soft starter is arranged behind the transformer and in front of the switched capacitor controller, and the comprehensive protector is arranged behind the switched capacitor controller and in front of the submersible electric pump;
the motor rotating speed velometer is any one of a magnetoelectric sensor, a tachogenerator and a rotary encoder, and the installation part is a rotor matched with a motor;
the controller is a DSP controller;
when the submersible electric pump is started, a differential value dn/dt of the rotating speed and the acceleration of the submersible electric pump is monitored, when the differential value is monitored to be smaller than a fixed value C, namely dn/dt < C, which indicates that the torque of the submersible electric pump at the moment is close to the load resistance torque of a motor and the starting is difficult, a matching capacitor of the submersible electric pump is put into a loop along the polarity, the current in an approximate LC oscillation loop is increased at the moment, the voltage of a point B at a power receiving end of the submersible electric pump is increased, the voltage of the point B at the power receiving end of the submersible electric pump is linearly increased according to the characteristic of the motor matched with the submersible electric pump, the starting torque of the submersible electric pump is increased quadratically, the starting torque of the submersible electric pump is improved, the load resistance torque of the motor is overcome, the current in a superior power supply line is not increased, the power supply transformer is safely operated, and after the submersible electric pump is, the submersible electric pump can be started safely and reliably.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710758704.9A CN107327397B (en) | 2017-08-29 | 2017-08-29 | Electric control system for monitoring and improving starting performance of submersible electric pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710758704.9A CN107327397B (en) | 2017-08-29 | 2017-08-29 | Electric control system for monitoring and improving starting performance of submersible electric pump |
Publications (2)
| Publication Number | Publication Date |
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| CN107327397A CN107327397A (en) | 2017-11-07 |
| CN107327397B true CN107327397B (en) | 2021-06-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710758704.9A Active CN107327397B (en) | 2017-08-29 | 2017-08-29 | Electric control system for monitoring and improving starting performance of submersible electric pump |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108879392A (en) * | 2018-07-26 | 2018-11-23 | 江苏银佳电气设备有限公司 | A kind of 10kV high-pressure immersed electromotor monitoring switching cabinet |
| CN111692088B (en) * | 2020-05-21 | 2022-03-01 | 钦州绿传科技有限公司 | Diagnosis and control method for preventing electronic oil pump from failing |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2151091A (en) * | 1983-11-07 | 1985-07-10 | Pfeiffer Vakuumtechnik | Electric drive for oil sealed sliding vane rotary vacuum pump |
| JPS62207192A (en) * | 1986-03-04 | 1987-09-11 | Nippon Denso Co Ltd | Chopper device for dc motor |
| CN1132961A (en) * | 1994-08-31 | 1996-10-09 | 三菱电机株式会社 | Single-phase induction motor and refrigerator using single-phase induction motor |
| CN2285376Y (en) * | 1996-11-22 | 1998-07-01 | 庞春龙 | Regenerative starter for air conditioner compressor |
| CN101361244A (en) * | 2006-01-20 | 2009-02-04 | 开利公司 | Electronic method for starting compressor |
| CN207377784U (en) * | 2017-08-29 | 2018-05-18 | 合肥恒大江海泵业股份有限公司 | A kind of electric-control system for being used to monitoring, being promoted submersible pump startability |
-
2017
- 2017-08-29 CN CN201710758704.9A patent/CN107327397B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2151091A (en) * | 1983-11-07 | 1985-07-10 | Pfeiffer Vakuumtechnik | Electric drive for oil sealed sliding vane rotary vacuum pump |
| JPS62207192A (en) * | 1986-03-04 | 1987-09-11 | Nippon Denso Co Ltd | Chopper device for dc motor |
| CN1132961A (en) * | 1994-08-31 | 1996-10-09 | 三菱电机株式会社 | Single-phase induction motor and refrigerator using single-phase induction motor |
| CN2285376Y (en) * | 1996-11-22 | 1998-07-01 | 庞春龙 | Regenerative starter for air conditioner compressor |
| CN101361244A (en) * | 2006-01-20 | 2009-02-04 | 开利公司 | Electronic method for starting compressor |
| CN207377784U (en) * | 2017-08-29 | 2018-05-18 | 合肥恒大江海泵业股份有限公司 | A kind of electric-control system for being used to monitoring, being promoted submersible pump startability |
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| CN107327397A (en) | 2017-11-07 |
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