CN106199425A - A kind of for judging the method whether motor of oil extractor uses discontinuous power supply - Google Patents

Abstract

The invention discloses a kind of for judging the method whether motor of oil extractor uses discontinuous power supply, the electric parameters such as the discrete power during the motor measured fortune merit are utilized to be acquired and off-line identification, judge that motor is if appropriate for discontinuous power supply Energy Saving Control according to identification result and power-off criterion, if meeting power-off criterion, then according to carrying out power-off interval selection without the power curve feature under operating condition.The method is mainly used in periodically potential energy load and has electronic and generating operation mode electric motor system within a working cycle, and major function is to judge that motor if appropriate for discontinuous power supply Energy Saving Control and selects optimum power-off control strategy according to operating condition.Can judge online, if appropriate for discontinuous power supply control, to provide foundation for equipment the need of installing, artificial and equipment cost therefore can be greatly lowered by the industry and mining city of a working cycle.

Description

A kind of for judging the method whether motor of oil extractor uses discontinuous power supply

Technical field

The invention belongs to energy saving motor and control technical field, particularly relate to a kind of for judging that motor of oil extractor is The method of no use discontinuous power supply.

Background technology

Oil field equipment mostly is beam pumping unit, in order to realize good starting performance, simultaneously energy both at home and abroad Enough improving electric efficiency to greatest extent, the existence ratio of " low load with strong power " phenomenon is being in capacity configuration for pumping-unit motor Being gradually reduced, therefore the range of application of the corresponding conservation measures such as pressure regulation, the conversion of star angle is gradually reduced, and its energy-saving effect is the most Reduce.And discontinuous power supply technology is for load-rate of motor not requirement, only to the variation tendency of load power curve, electronic and send out Electricity feature has certain requirement, and therefore, discontinuous power supply technology has bigger range of application.But discontinuous power supply technology is not particularly suited for All oil well load, during controlling, the operation characteristic according to motor of oil extractor system and oil well load feature, pass through Motor of oil extractor is run the on-line checking of electric parameters, it is judged that different oil well load are if appropriate for using discontinuous power supply technology.

The multiformity feature of pumping unit load:

1) mostly there is generator operation operating mode in beam pumping unit load, but has minority oil well due to liquid component and to put down The reasons such as weighing apparatus configuration, power generation process is of short duration even without power generation process, the stability that so can control discontinuous power supply and joint thereof Can effect impact.

2) due to the complexity of underground hole condition, different pumping unit loads have different variation characteristics；Same is taken out Oil machine, the power variation rate on different load region in a load period is the most different.When load drastically changes, power becomes Rate is high, implements discontinuous power supply and controls there is bigger difficulty, even can affect pumpingh well normal safe and run.

In discontinuous power supply control, it is therefore intended that realize the energy-conservation of pumping-unit motor by discontinuous power supply technology and complete Become the controlling unit of " power-off is not shut down, is energized without impact ".This just requires that load power must change according to certain rule, is not to appoint The load of meaning change is suitable for discontinuous power supply control, if controlling to be applied on unaccommodated load by discontinuous power supply, then can go out The most energy-conservation situation about consuming energy all the better, even there will be the situation of oil pumper job insecurity；In addition, for suitable Close for implementing the oil well load that discontinuous power supply controls, in order to reach best energy-saving effect and not affect the normal steady of oil pumper Fixed work, selects suitable outage area particularly important.

Motor of oil extractor discontinuous power supply power-saving technology has been widely used for oil pumping in oil fields work, the oil pumping of prior art When electric motor implements discontinuous power supply technology, often directly at motor side, switch board is installed, and investigates this oil well the most in advance Load controls if appropriate for application discontinuous power supply, which results in after switch board puts into operation, and its internal judgment cannot be implemented Discontinuous power supply controls technology, and is constantly in continuous power supply state, thus result in the waste of equipment.

It is desirable to have a kind of disconnected if appropriate for using for judging when motor of oil extractor drive cycle potential energy loads The decision method that continuous power supply energy-saving controls is transformed, and is a kind of direction of following energy-saving control management system development, is existing The emphasis of technical research.

Summary of the invention

Discontinuous power supply controls technology and is widely used in periodically potential energy load Energy Saving Control field, but the most all of week The load of phase property potential energy is suitable for carrying out discontinuous power supply control.Therefore, stable in order to ensure, save equipment investment, prejudge Different cycles load controls to become particularly important if appropriate for discontinuous power supply.The present invention is directed to discontinuous power supply energy-conserving control technology The problems such as operation stability and energy-saving efficiency are deposited, it is proposed that one is sentenced according to load behavior under different loads operating mode Disconnected motor of oil extractor is if appropriate for the decision method of discontinuous power supply and device.I.e. it is an object of the invention to provide a kind of for Judge whether motor of oil extractor uses the method for discontinuous power supply to overcome the above-mentioned problems in the prior art.

For achieving the above object, the present invention provides a kind of for judging whether motor of oil extractor uses the side of discontinuous power supply Method, is utilized and measures the motor operation electric parameters arrived, be filtered by the discrete power of calculated motor operation course, divide District processes, and analyzes changed power feature, it is judged that energy-conservation if appropriate for using discontinuous power supply during the load of electric motor driven cycle potential energy Control；

Calculated discrete power p (k) is carried out multiple spot filtering, and records filtered power curve；Filtering type is such as Under:

$P_{\_Filter}\left(i\right)=\left(\underset{j=0}{\overset{j=j_0}{\Σ}}p\right(j_0*i+j\left)\right)/j_0$

In above formula, p (k) is the discrete power point calculated in real time, j₀It is filtering number, P_{_Filter}I () is multi-point average after Filtered power point, i, j, k=1,2,3....

Preferably, calculated filtered power P_{_Filter}I () marks off electronic decline region, power generation region and electronic Elevated areas, the filtered power in each region is expressed as: p_dx(i)、p_fd(i)、p_ds(i)；

The minus continuum of filtered power is power generation region, and its duration is Δ T_f；Filtered power is more than The continuum of zero is electric zone, and the region that wherein filtered power rises continuously is electronic elevated areas, and filtered power is continuous The region declined is electronic decline region.

Preferably, as described duration Δ T_fLess than oil pumper cycle of operation T 8% time, be not suitable for power-off energy saving Control；As described duration Δ T_fMore than oil pumper cycle of operation T 8% time, be suitable for use power-off energy saving control.

Preferably, described p_fd(i)、p_dsI the region of () carries out power variation rate analysis, its formula is as follows:

P′_Filter(i)=| P_{_Filter}(i+1)-P_{_Filter}(i)|/P₀(i=1,2,3...)

Wherein P₀For motor rated power.

To P '_FilterI () discrete function takes maximum, its formula is as follows:

P′_max=max (P '_Filter(i))

P is calculated respectively by above-mentioned formula_fd(i)、p_dsThe maximum power variation value P ' in (i) region_fdmax、P′_dsmax。

Preferably, as P '_fdmax、P′_dsmaxIn at least one value less than or equal to 0.3 time, then meet discontinuous power supply control want Ask, carry out power-off program analysis；Such as P '_fdmax、P′_dsmaxDuring all greater than 0.3, then it is unsatisfactory for discontinuous power supply and controls requirement.

Preferably, put into according to power-off and power supply that region is different is divided into three kinds of discontinuous power supply control programs；

Scheme 1: at the power drop region P of electronic operating mode_dxRun slowly to power generation region P after (i) power-off_fdI (), adds Speed is run to putting into power supply during synchronizing speed；

Scheme 2: in power generation region P_fdI after () power-off, Accelerating running is to electronic elevated areas P_dsI (), runs slowly to same Power supply is put into when leg speed is spent；

Scheme 3: at electronic decline region P_dxI () power-off rear motor runs slowly, through power generation region P_fdI () accelerates fortune In electronic elevated areas P after row_dsI () is decelerated to during synchronizing speed put into power supply.

Preferably, judge whether motor of oil extractor uses discontinuous power supply in the following way:

1) as only P '_dsmaxWhen≤0.3, and meet Δ T_fMore than the 15% of oil pumper cycle of operation, then selection scheme 3；

As only P '_dsmaxWhen≤0.3, and meet Δ T_fLess than the 15% of oil pumper cycle of operation, then selection scheme 2；

2) as only P '_fdmaxWhen≤0.3, then selection scheme 1；

3) as P '_dsmax、P′_fdmaxWhen simultaneously≤0.3, as Δ T_fMore than oil pumper cycle of operation 15% time, then selecting party Case 3；

As Δ T_fLess than oil pumper cycle of operation 15% time, and P '_fdmax＜ P '_dsmaxTime, then selection scheme 1；

As Δ T_fLess than oil pumper cycle of operation 15% time, and P '_fdmax＞ P '_dsmaxTime, then selection scheme 2.

The present invention has taken into full account oil well load feature, the parameter such as including continuous power-off time, region load changing rate, When switch board do not installed by motor, can test this oil well load if appropriate for application discontinuous power supply control technology, if passed through Test judges inapplicable this kind of power-saving technology of this oil well load, the most no longer installs discontinuous power supply switch board, joint for this motor Save equipment investment, it is to avoid the wasting of resources.

The invention have the benefit that

Proposed by the invention for judging the oil pumper decision method if appropriate for discontinuous power supply, it is possible to for different oil Well load carries out precision analysis, has taken into full account oil well load feature, oil well load different characteristic interval can be carried out segmentation, The parameter such as including continuous power-off time, region load changing rate, according to the characteristic interval of different load, it is judged that this load is the fullest Foot discontinuous power supply criterion；Method proposed by the invention can be used for check oil pumper the need of install discontinuous power supply switch board, Save equipment investment, it is to avoid the wasting of resources.

Accompanying drawing explanation

Accompanying drawing 1 is that judgement oil pumper of the present invention is if appropriate for discontinuous power supply flow chart；

Accompanying drawing 2 is the A load power curve gathered for device of the present invention；

Accompanying drawing 3 is that device of the present invention is by 10 filtered waveforms of A load power curve；

Accompanying drawing 4 is the region division schematic diagram that will carry out after the filtering of load A power curve of the present invention；

Accompanying drawing 5 is load A power variation rate oscillogram of the present invention；

Accompanying drawing 6 is the B load power curve that device of the present invention gathers；

Accompanying drawing 7 is the region division schematic diagram that will carry out after the filtering of load B power curve of the present invention；

Accompanying drawing 8 is the C load power curve that device of the present invention gathers；

Accompanying drawing 9 is the region division schematic diagram that will carry out after the filtering of load C power curve of the present invention；

Accompanying drawing 10 is load C power variation rate oscillogram of the present invention.

Detailed description of the invention

Clearer for the purpose making the present invention implement, technical scheme and advantage, below in conjunction with in the embodiment of the present invention Accompanying drawing, the technical scheme in the embodiment of the present invention is further described in more detail.In the accompanying drawings, the most identical or class As label represent same or similar element or there is the element of same or like function.Described embodiment is the present invention A part of embodiment rather than whole embodiments.The embodiment described below with reference to accompanying drawing is exemplary, it is intended to use In explaining the present invention, and it is not considered as limiting the invention.Based on the embodiment in the present invention, ordinary skill people The every other embodiment that member is obtained under not making creative work premise, broadly falls into the scope of protection of the invention.Under Face combines accompanying drawing and is described in detail embodiments of the invention.

In describing the invention, it is to be understood that term " " center ", " longitudinally ", " laterally ", "front", "rear", The orientation of the instruction such as "left", "right", " vertically ", " level ", " top ", " end " " interior ", " outward " or position relationship are for based on accompanying drawing institute The orientation shown or position relationship, be for only for ease of and describe the present invention and simplify description rather than instruction or the dress of hint indication Put or element must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that protect the present invention The restriction of scope.

In the present invention one broad embodiment: a kind of for judging whether motor of oil extractor uses the side of discontinuous power supply Method, is utilized and measures the motor operation electric parameters arrived, be filtered by the discrete power of calculated motor operation course, divide District processes, and analyzes changed power feature, it is judged that energy-conservation if appropriate for using discontinuous power supply during the load of electric motor driven cycle potential energy Control；

Calculated discrete power p (k) is carried out multiple spot filtering, and records filtered power curve；Filtering type is such as Under:

$P_{\_Filter}\left(i\right)=\left(\underset{j=0}{\overset{j=j_0}{\Σ}}p\right(j_0*i+j\left)\right)/j_0$

In above formula, p (k) is the discrete power point calculated in real time, j₀It is filtering number, P_{_Filter}I () is multi-point average after Filtered power point, i, j, k=1,2,3....

The present invention has taken into full account oil well load feature, the parameter such as including continuous power-off time, region load changing rate, When switch board do not installed by motor, can test this oil well load if appropriate for application discontinuous power supply control technology, if passed through Test judges inapplicable this kind of power-saving technology of this oil well load, the most no longer installs discontinuous power supply switch board, joint for this motor Save equipment investment, it is to avoid the wasting of resources.

Proposed by the invention for judging the oil pumper decision method if appropriate for discontinuous power supply, it is possible to for different oil Well load carries out precision analysis, has taken into full account oil well load feature, oil well load different characteristic interval can be carried out segmentation, The parameter such as including continuous power-off time, region load changing rate, according to the characteristic interval of different load, it is judged that this load is the fullest Foot discontinuous power supply criterion；Method proposed by the invention can be used for check oil pumper the need of install discontinuous power supply switch board, Save equipment investment, it is to avoid the wasting of resources.

Now according to accompanying drawing 1-10, embodiments of the present invention is described in detail.

The present invention provides a kind of for judging the method whether motor of oil extractor uses discontinuous power supply, utilizes measurement to arrive Motor runs electric parameters, is filtered by the discrete power of calculated motor process, multidomain treat-ment, analyzes changed power Feature, it is judged that if appropriate for using discontinuous power supply Energy Saving Control during the load of electric motor driven cycle potential energy；

Calculated discrete power p (k) is carried out multiple spot filtering, and records filtered power curve；Filtering type is such as Under:

$P_{\_Filter}\left(i\right)=\left(\underset{j=0}{\overset{j=j_0}{\Σ}}p\right(j_0*i+j\left)\right)/j_0$

In above formula, p (k) is the discrete power point calculated in real time, j₀It is filtering number, P_{_Filter}I () is multi-point average after Filtered power point, i, j, k=1,2,3....

Calculated filtered power P_{_Filter}I () marks off electronic decline region, power generation region and electronic rising area Territory, the filtered power in each region is expressed as: p_dx(i)、p_fd(i)、p_ds(i)；

The minus continuum of filtered power is power generation region, and its duration is Δ T_f；Filtered power is more than The continuum of zero is electric zone, and the region that wherein filtered power rises continuously is electronic elevated areas, and filtered power is continuous The region declined is electronic decline region.

As described duration Δ T_fLess than oil pumper cycle of operation T 8% time, be not suitable for power-off energy saving control；When Described duration Δ T_fMore than oil pumper cycle of operation T 8% time, be suitable for use power-off energy saving control.

Described p_fd(i)、p_dsI the region of () carries out power variation rate analysis, its formula is as follows:

P′_Filter(i)=| P_{_Filter}(i+1)-P_{_Filter}(i)|/P₀(i=1,2,3...)

Wherein P₀For motor rated power.

To P '_FilterI () discrete function takes maximum, its formula is as follows:

P′_max=max (P '_Filter(i))

P is calculated respectively by above-mentioned formula_fd(i)、p_dsThe maximum power variation value P ' in (i) region_fdmax、P′_dsmax。

As P '_fdmax、P′_dsmaxIn at least one value less than or equal to 0.3 time, then meet discontinuous power supply control requirement, carry out Power-off program analysis；Such as P '_fdmax、P′_dsmaxDuring all greater than 0.3, then it is unsatisfactory for discontinuous power supply and controls requirement.

Put into according to power-off and power supply that region is different is divided into three kinds of discontinuous power supply control programs；

Scheme 1: at the power drop region P of electronic operating mode_dxRun slowly to power generation region P after (i) power-off_fdI (), adds Speed is run to putting into power supply during synchronizing speed；

Scheme 2: in power generation region P_fdI after () power-off, Accelerating running is to electronic elevated areas P_dsI (), runs slowly to same Power supply is put into when leg speed is spent；

Scheme 3: at electronic decline region P_dxI () power-off rear motor runs slowly, through power generation region P_fdI () accelerates fortune In electronic elevated areas P after row_dsI () is decelerated to during synchronizing speed put into power supply.

Judge whether motor of oil extractor uses discontinuous power supply in the following way:

1) as only P '_dsmaxWhen≤0.3, and meet Δ T_fMore than the 15% of oil pumper cycle of operation, then selection scheme 3；

As only P '_dsmaxWhen≤0.3, and meet Δ T_fLess than the 15% of oil pumper cycle of operation, then selection scheme 2；

2) as only P '_fdmaxWhen≤0.3, then selection scheme 1；

3) as P '_dsmax、P′_fdmaxWhen simultaneously≤0.3, as Δ T_fMore than oil pumper cycle of operation 15% time, then selecting party Case 3；

As Δ T_fLess than oil pumper cycle of operation 15% time, and P '_fdmax＜ P '_dsmaxTime, then selection scheme 1；

As Δ T_fLess than oil pumper cycle of operation 15% time, and P '_fdmax＞ P '_dsmaxTime, then selection scheme 2.

Embodiment one:

Accompanying drawing 2 show device of the present invention and utilizes the electric parameters calculated load power curve detected, right Calculated discrete power p (k) of load power curve shown in accompanying drawing 2 carries out multiple spot filtering, and it is bent to record filtered power Line；Filtering type is as follows:

$P_{\_Filter}\left(i\right)=\left(\underset{j=0}{\overset{j=j_0}{\Σ}}p\right(j_0*i+j\left)\right)/j_0$

In above formula, p (k) is the discrete power point calculated in real time, j₀It is filtering number, P_{_Filter}I () is multi-point average after Filtered power point, i, j, k=1,2,3..., obtain the power curve the most more smoothed after filtering；

Calculated filtered power P_{_Filter}I () marks off electronic decline region, power generation region and electronic rising area Territory, the filtered power in each region is expressed as: p_dx(i)、p_fd(i)、p_ds(i)；

The minus continuum of filtered power is power generation region, and its duration is Δ T_f；Filtered power is more than The continuum of zero is electric zone, and the region that wherein filtered power rises continuously is electronic elevated areas, and filtered power is continuous The region declined is electronic decline region, the filtered power of detection carries out region and divides as shown in Figure 4；

As described duration Δ T_fLess than oil pumper cycle of operation T 8% time, be not suitable for power-off energy saving control；When Described duration Δ T_fMore than oil pumper cycle of operation T 8% time, be suitable for use power-off energy saving control.Song shown in accompanying drawing 4 Power generation region duration Δ T in line_f＞ 8%T；

Described p_fd(i)、p_dsI the region of () carries out power variation rate analysis, its formula is as follows:

P′_Filter(i)=| P_{_Filter}(i+1)-P_{_Filter}(i)|/P₀(i=1,2,3...)

Wherein P₀For motor rated power.

To P '_FilterI () discrete function takes maximum, its formula is as follows:

P′_max=max (P '_Filter(i))

Curve p described in accompanying drawing 4 is calculated respectively by above-mentioned formula_fd(i)、p_dsThe maximum power variation value in (i) region P′_fdmax、P′_dsmax, 5 understand maximum power variation value P ' with reference to the accompanying drawings_fdmax、P′_dsmaxSmaller than 0.3, and Δ T_f=37.5%T, Meet as P '_dsmax、P′_fdmaxWhen simultaneously≤0.3, as Δ T_fMore than oil pumper cycle of operation 15% time, then selection scheme 3；When ΔT_fLess than oil pumper cycle of operation 15% time, and P '_fdmax＜ P '_dsmaxTime, then selection scheme 1；As Δ T_fLess than oil pumper Cycle of operation 15% time, and P '_fdmax＞ P '_dsmaxTime, then selection scheme 2, corresponding power-off criterion；

Embodiment two:

Accompanying drawing 6 show device of the present invention and utilizes the electric parameters calculated load power curve detected, right Calculated discrete power p (k) of load power curve shown in accompanying drawing 6 carries out multiple spot filtering, and it is bent to record filtered power Line；Filtering type is as follows:

$P_{\_Filter}\left(i\right)=\left(\underset{j=0}{\overset{j=j_0}{\Σ}}p\right(j_0*i+j\left)\right)/j_0$

In above formula, p (k) is the discrete power point calculated in real time, j₀It is filtering number, P_{_Filter}I () is multi-point average after Filtered power point, i, j, k=1,2,3..., obtain the power curve the most more smoothed after the filtering of described method；

Calculated filtered power P_{_Filter}I () marks off electronic decline region, power generation region and electronic rising area Territory, the filtered power in each region is expressed as: p_dx(i)、p_fd(i)、p_ds(i)；

The minus continuum of filtered power is power generation region, and its duration is Δ T_f；Filtered power is more than The continuum of zero is electric zone, and the region that wherein filtered power rises continuously is electronic elevated areas, and filtered power is continuous The region declined is electronic decline region, the filtered power of detection carries out region and divides as shown in Figure 7；

As described duration Δ T_fLess than oil pumper cycle of operation T 8% time, be not suitable for power-off energy saving control；When Described duration Δ T_fMore than oil pumper cycle of operation T 8% time, be suitable for using power-off energy saving to control, bent shown in accompanying drawing 7 Power generation region duration Δ T in line_f≤ 8%T, is unsatisfactory for power-off criterion；

Embodiment three:

Accompanying drawing 8 show device of the present invention and utilizes the electric parameters calculated load power curve detected, right Load power curve shown in accompanying drawing 8 carries out multiple spot filtering to calculated discrete power p (k), and records filtered power Curve；Filtering type is as follows:

$P_{\_Filter}\left(i\right)=\left(\underset{j=0}{\overset{j=j_0}{\Σ}}p\right(j_0*i+j\left)\right)/j_0$

In above formula, p (k) is the discrete power point calculated in real time, j₀It is filtering number, P_{_Filter}I () is multi-point average after Filtered power point, i, j, k=1,2,3..., obtain the power curve the most more smoothed after the filtering of described method；

Calculated filtered power P_{_Filter}I () marks off electronic decline region, power generation region and electronic rising area Territory, the filtered power in each region is expressed as: p_dx(i)、p_fd(i)、p_ds(i)；

The minus continuum of filtered power is power generation region, and its duration is Δ T_f；Filtered power is more than The continuum of zero is electric zone, and the region that wherein filtered power rises continuously is electronic elevated areas, and filtered power is continuous The region declined is electronic decline region, the filtered power of detection carries out region and divides as shown in Figure 7；

As described duration Δ T_fLess than oil pumper cycle of operation T 8% time, be not suitable for power-off energy saving control；When Described duration Δ T_fMore than oil pumper cycle of operation T 8% time, be suitable for using power-off energy saving to control, bent shown in accompanying drawing 9 Power generation region duration Δ T in line_f＞ 8%T；

P ' shown in 10 with reference to the accompanying drawings_dsmax＞ 0.3 and P '_fdmax＜ 0.3, meeting ought only P '_dsmaxWhen≤0.3, and meet Δ T_fMore than the 15% of oil pumper cycle of operation, then selection scheme 3；

As only P '_dsmaxWhen≤0.3, and meet Δ T_fLess than the 15% of oil pumper cycle of operation, then selection scheme 2 right The power-off criterion answered.

Last it is noted that above example is only in order to illustrate technical scheme, it is not intended to limit.To the greatest extent The present invention has been described in detail by pipe with reference to previous embodiment, it will be understood by those within the art that: it is still Technical scheme described in foregoing embodiments can be modified, or wherein portion of techniques feature is carried out equivalent replace Change；And these amendments or replacement, do not make the essence of appropriate technical solution depart from the essence of various embodiments of the present invention technical scheme God and scope.

Claims (7)

1. one kind is used for judging the method whether motor of oil extractor uses discontinuous power supply, it is characterised in that: utilize measurement to arrive Motor runs electric parameters, is filtered by the discrete power of calculated motor operation course, multidomain treat-ment, analyzes power Variation Features, it is judged that if appropriate for using discontinuous power supply Energy Saving Control during the load of electric motor driven cycle potential energy；

Described calculated discrete power p (k) is carried out multiple spot filtering, and records filtered power curve；Filtering type is such as Under:

$P_{\_Filter}\left(i\right)=\left(\underset{j=0}{\overset{j=j_0}{\Σ}}p\right(j_0*i+j\left)\right)/j_0$

In above formula, p (k) is the discrete power point calculated in real time, j₀It is filtering number, P_{_Filter}I () is the filtering after multi-point average Power points, i, j, k=1,2,3.....

The most according to claim 1 for judging the method whether motor of oil extractor uses discontinuous power supply, its feature exists In: calculated filtered power P_{_Filter}I () marks off electronic decline region, power generation region and electronic elevated areas, respectively The filtered power in region is expressed as: p_dx(i)、p_fd(i)、p_ds(i)；

The minus continuum of filtered power is power generation region, and its duration is Δ T_f；The filtered power company more than zero Continuous region is electric zone, and the region that wherein filtered power rises continuously is electronic elevated areas, and filtered power declines continuously Region is electronic decline region.

3. judge, according to being used for described in its claim 2, the method whether motor of oil extractor uses discontinuous power supply, its feature It is: as described duration Δ T_fLess than oil pumper cycle of operation T 8% time, be not suitable for power-off energy saving control；When described Duration Δ T_fMore than oil pumper cycle of operation T 8% time, be suitable for use power-off energy saving control.

4. a kind of for judging the method whether motor of oil extractor uses discontinuous power supply according to described in its claim 3, its It is characterised by: described p_fd(i)、p_dsI the region of () carries out power variation rate analysis, its formula is as follows:

P′_Filter(i)=| P_{_Filter}(i+1)-P_{_Filter}(i)|P₀(i=1,2,3 ...)

Wherein P₀For motor rated power.

To P '_FilterI () discrete function takes maximum, its formula is as follows:

P′_max=max (P '_Filter(i))

P is calculated respectively by above-mentioned formula_fd(i)、p_dsThe maximum power variation value P ' in (i) region_fdmax、P′_dsmax。

5. a kind of for judging the method whether motor of oil extractor uses discontinuous power supply according to described in its claim 4, It is characterized in that: as P '_fdmax、P′_dsmaxIn at least one value less than or equal to 0.3 time, then meet discontinuous power supply control requirement, Carry out power-off program analysis；Such as P '_fdmax、P′_dsmaxDuring all greater than 0.3, then it is unsatisfactory for discontinuous power supply and controls requirement.

6. a kind of for judging the method whether motor of oil extractor uses discontinuous power supply according to described in its claim 5, It is characterized in that: put into according to power-off and power supply that region is different is divided into three kinds of discontinuous power supply control programs；

Scheme 1: at the power drop region P of electronic operating mode_dxRun slowly to power generation region P after (i) power-off_fd(i), Accelerating running To putting into power supply during synchronizing speed；

Scheme 2: in power generation region P_fdI after () power-off, Accelerating running is to electronic elevated areas P_dsI (), runs slowly to synchronizing speed Time put into power supply；

Scheme 3: at electronic decline region P_dxI () power-off rear motor runs slowly, through power generation region P_fdAfter (i) Accelerating running Electronic elevated areas P_dsI () is decelerated to during synchronizing speed put into power supply.

7. a kind of for judging the method whether motor of oil extractor uses discontinuous power supply according to described in its claim 6, It is characterized in that:

1) as only P '_dsmaxWhen≤0.3, and meet Δ T_fMore than the 15% of oil pumper cycle of operation, then selection scheme 3；

As only P '_dsmaxWhen≤0.3, and meet Δ T_fLess than the 15% of oil pumper cycle of operation, then selection scheme 2；

2) as only P '_fdmaxWhen≤0.3, then selection scheme 1；

3) as P '_dsmax、P′_fdmaxWhen simultaneously≤0.3, as Δ T_fMore than oil pumper cycle of operation 15% time, then selection scheme 3；

As Δ T_fLess than oil pumper cycle of operation 15% time, and P '_fdmax＜ P '_dsmaxTime, then selection scheme 1；

As Δ T_fLess than oil pumper cycle of operation 15% time, and P '_fdmax＞ P '_dsmaxTime, then selection scheme 2.