CN104319806A - Inverting control system applicable to well sites of oil fields and used for photovoltaic power generation grid connection, and work method - Google Patents
Inverting control system applicable to well sites of oil fields and used for photovoltaic power generation grid connection, and work method Download PDFInfo
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Abstract
The invention relates to an inverting control system applicable to well sites of oil fields and used for photovoltaic power generation grid connection, and a work method. The inverting control system comprises a photovoltaic power generation device and an automatic equalization control inverter connected with a grid connection converter which is arranged in the photovoltaic power generation device. A three-phase output end of the automatic equalization control inverter is connected with a load of a well site of an oil field. The automatic equalization control inverter is suitable to convert switched-in power grid three-phase electricity into direct-current output voltage U0, and compares the direct-current output voltage U0 with direct-current output voltage U1 of the grid connection inverter to choose the output voltage with high voltage value to serve as input voltage of a three-phase inverter of the automatic equalization control inverter. The inverting control system achieves grid connection of output electricity of the photovoltaic power generation device and mains supply as well as automatic regulation and control through the automatic equalization control inverter, ensures that the three-phase inverter obtains the optimum input voltage, and accordingly improves the output power of the three-phase inverter.
Description
Technical field
The present invention relates to a kind of technical field of photovoltaic power generation, particularly a kind of photovoltaic power generation grid-connecting inverse control system and method for work being suitable for well site of oil field.
Background technology
After 20 century 70s, along with the development of modern industry, global energy crisis and atmosphere polluting problem become increasingly conspicuous, and traditional fossil fuel energy reduces day by day, become increasingly conspicuous to the harm that environment causes.Regenerative resource has all been invested sight in the whole world, wishes that regenerative resource can change the energy resource structure of the mankind, maintains long-range sustainable development, and wherein solar energy becomes the focus that people pay attention to its exclusive advantage.Abundant solar energy is the energy that inexhaustible, nexhaustible, pollution-free, cheap, the mankind can freely utilize.Solar energy arrives the energy on ground each second up to 800,000 kilowatt hours, if the solar energy of earth surface 0.1% is transferred to electric energy, number turnover 5%, every annual energy output can reach 5.6 × 1012 kilowatt-hours, is equivalent to 40 times of energy consumption in the world.Just because of these unique advantages of solar energy, after 2000, the range of application of solar energy power generating is day by day wide, market scale also progressively expands.
Oil extraction system (mainly pumping-unit motor) is as the maximum productive power system in oil field, and within its year, power consumption accounts for 56% of oil field total electricity consumption.There is the un-reasonable phenomenon of " low load with strong power " in the motor coupling of oil pumper, oil pumper existence is partly dragged for or sky drags for phenomenon, and motor load rate is general lower, and when therefore oil pumper runs, power factor is very low, and energy loss is serious.
In prior art, China Patent No. 201120440071.5, Authorization Notice No. CN 202309101 U, the utility model patent of " oil field distribution type photovoltaic power generation device " in authorized announcement date on July 4th, 2014 discloses a kind of oil field distribution type photovoltaic power generation device, it mainly adopts the technological maheup oil field distribution type photovoltaic power generation devices such as distributed power generation, common DC bus many inversions alternating current machine electric-generating feedback power supply capacity is shared, the observing and controlling of common DC bus electric energy balance, super capacitor energy-storage, although can meet the needs of oil field photovoltaic generation, power supply; But this technical scheme does not consider the output electric energy of photovoltaic power generation apparatus and the grid-connected and auto-adjustment control of civil power, to improve the problem of the power output of three-phase inverter, causes the power output of this technical scheme lower, affects the normal work of described oil pumper.
Summary of the invention
The object of this invention is to provide a kind of photovoltaic power generation grid-connecting inverse control system being suitable for well site of oil field, this inverse control system is by by the output electric energy of photovoltaic power generation apparatus and the grid-connected and auto-adjustment control of civil power, ensure that three-phase inverter obtains best input voltage, to improve the power output of three-phase inverter.
The object of the present invention is achieved like this: a kind of photovoltaic power generation grid-connecting inverse control system being suitable for well site of oil field, comprise: photovoltaic power generation apparatus, and the automatic equalization control inverter to be connected with the grid-connection converter in this photovoltaic power generation apparatus, the three-phase output end of described automatic equalization control inverter is connected with well site of oil field load; Wherein, described automatic equalization control inverter, it is suitable for the electrical network three-phase electricity of access to be converted to VD U
0, and by this VD U
0with the VD U of described grid-connection converter
1compare, the input voltage using the output voltage selecting magnitude of voltage high as three-phase inverter in described automatic equalization control inverter.
The present invention achieves the output electric energy of photovoltaic power generation apparatus and the grid-connected and auto-adjustment control of civil power by automatic equalization control inverter, ensure that three-phase inverter obtains best input voltage, to improve the power output of three-phase inverter.
Preferably, the technical problem that the grid-connected and output voltage in auto-adjustment control of output electric energy and civil power in order to solve photovoltaic power generation apparatus further switches; Described automatic equalization control inverter comprises: main control module, and the control output end of this main control module is connected with the control end of each switching tube in described three-phase inverter; And input channel selection circuit, it comprises: be suitable for first, second switching tube connecting two output voltages respectively; Described main control module is suitable for VD U
0with VD U
1compare, connect switching tube conducting with the output voltage selecting magnitude of voltage high, input to described three-phase inverter afterwards after filtering to make this output voltage.VD U is achieved by first, second switching tube and main control module
0and U
1switching, have that circuit is simple, the advantage of good reliability.
Preferably, in order to make the power output of this inverse control system maximize further; Described automatic equalization control inverter comprises: be suitable for three-phase electricity to be converted to described VD U
0three phase rectifier module, and first, second current sensor that is connected with the output of described three phase rectifier module, three-phase inverter respectively, the signals collecting end of described main control module is connected with the signal output part of first, second current sensor described; Described main control module is also suitable for the phase induced current gathered respectively according to the first current sensor or the second current sensor, export corresponding modulation signal, realizing reducing the frequency exporting three-phase voltage when exporting high load capacity to control three-phase inverter, improving the frequency exporting three-phase voltage when exporting underload.Exported the frequency of three-phase voltage by electric current adjustment, power output is better regulated, controls, keep the maximization of power output.
Optionally, described photovoltaic power generation apparatus comprises: the photovoltaic battery matrix be connected with grid-connection converter and storage battery, to realize, when photovoltaic battery matrix output voltage is on the low side, utilizes storage battery to meet grid-connection converter and normally exporting.
On the other hand, the present invention additionally provides a kind of method of work of photovoltaic power generation grid-connecting inverse control system on the described basis being suitable for the photovoltaic power generation grid-connecting inverse control system of well site of oil field, this method of work is by the output electric energy of photovoltaic power generation apparatus and the grid-connected and auto-adjustment control of civil power, ensure that three-phase inverter obtains best input voltage, to improve the power output of three-phase inverter.
Another object of the present invention is achieved in that a kind of method of work of photovoltaic power generation grid-connecting inverse control system, described photovoltaic power generation grid-connecting inverse control system comprises: photovoltaic power generation apparatus, and the automatic equalization control inverter that the grid-connection converter in this photovoltaic power generation apparatus is connected, the three-phase output end of described automatic equalization control inverter is connected with well site of oil field load; Described method of work comprises: by described automatic equalization control inverter, the electrical network three-phase electricity of access is converted to VD U
0, and by this VD U
0with the VD U of described grid-connection converter
1compare, the input voltage using the output voltage selecting magnitude of voltage high as three-phase inverter in described automatic equalization control inverter.
The present invention achieves the output electric energy of photovoltaic power generation apparatus and the grid-connected and auto-adjustment control of civil power by automatic equalization control inverter, ensure that three-phase inverter obtains best input voltage, to improve the power output of three-phase inverter.
Preferably, the technical problem that the grid-connected and output voltage in auto-adjustment control of output electric energy and civil power in order to solve photovoltaic power generation apparatus further switches; Described automatic equalization control inverter comprises: main control module, and the control output end of this main control module is connected with the control end of each switching tube in described three-phase inverter; And input channel selection circuit, it comprises: be suitable for first, second switching tube connecting two output voltages respectively; Described main control module is suitable for VD U
0with VD U
1compare, connect switching tube conducting with the output voltage selecting magnitude of voltage high, input to described three-phase inverter afterwards after filtering to make this output voltage.VD U is achieved by first, second switching tube and main control module
0and U
1switching, have that circuit is simple, the advantage of good reliability.
Preferably, described by VD U
0with VD U
1compare, the method using the output voltage selecting magnitude of voltage high as the input voltage of three-phase inverter in described automatic equalization control inverter comprises: by described VD U
1in be greater than VD U
0voltage segment be converted to pulse voltage, if when there is described pulse voltage, then described three-phase inverter obtains VD U
1; If when there is not described pulse voltage, then described three-phase inverter obtains VD U
0.By the pulse voltage of conversion, more directly, accurately VD U can be judged
0and U
1voltage swing.
Preferably, in order to make the power output of this inverse control system maximize further; Described automatic equalization control inverter comprises: be suitable for three-phase electricity to be converted to described VD U
0three phase rectifier module, and first, second current sensor that is connected with the output of described three phase rectifier module, three-phase inverter respectively, the signals collecting end of described main control module is connected with the signal output part of first, second current sensor described; Described method of work also comprises: the phase induced current that described main control module gathers respectively according to the first current sensor or the second current sensor, export corresponding modulation signal, realizing reducing the frequency exporting three-phase voltage when exporting high load capacity to control three-phase inverter, improving the frequency exporting three-phase voltage when exporting underload.Exported the frequency of three-phase voltage by electric current adjustment, power output is better regulated, controls, keep the maximization of power output.
Accompanying drawing explanation
Fig. 1 is theory diagram one of the present invention;
Fig. 2 is theory diagram two of the present invention;
Fig. 3 is theory diagram three of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further detailed explanation.These accompanying drawings are the schematic diagram of simplification, only basic structure of the present invention are described in a schematic way, and therefore it only shows the formation relevant with the present invention.
Embodiment 1
For the sake of clarity, the photovoltaic power generation grid-connecting inverse control system being suitable for well site of oil field described in can referred to as inverse control system.
Fig. 1 shows the theory diagram one of described inverse control system.
As shown in Figure 1, a kind of photovoltaic power generation grid-connecting inverse control system being suitable for well site of oil field, comprise: photovoltaic power generation apparatus, and the automatic equalization control inverter to be connected with the grid-connection converter in this photovoltaic power generation apparatus, the three-phase output end of described automatic equalization control inverter is connected with well site of oil field load; Wherein, described automatic equalization control inverter, it is suitable for the electrical network three-phase electricity of access to be converted to VD U
0, and by this VD U
0with the VD U of described grid-connection converter
1compare, the input voltage using the output voltage selecting magnitude of voltage high as three-phase inverter in described automatic equalization control inverter.Grid-connection converter is dc-dc.
Wherein, described well site of oil field load includes but not limited to oil pumper, is specially the motor of this oil pumper.
Fig. 2 shows the theory diagram two of described inverse control system.
As shown in Figure 2, described automatic equalization control inverter comprises: main control module, and the control output end of this main control module is connected with the control end of each switching tube in described three-phase inverter; And input channel selection circuit, it comprises: be suitable for first, second switching tube connecting two output voltages respectively; Described main control module is suitable for VD U
0with VD U
1compare, connect switching tube conducting with the output voltage selecting magnitude of voltage high, input to described three-phase inverter afterwards after filtering to make this output voltage.Described main control module adopts but is not limited to, such as TMS320 series DSP chip.First, second switching tube described can adopt but be not limited to metal-oxide-semiconductor, NPN triode.In described three-phase inverter, each switching tube can adopt but be not limited to igbt transistor.
Optionally, described VD U
1with described VD U
0compare, by described VD U
1in be greater than VD U
0voltage segment be converted to pulse voltage; If when there is described pulse voltage, then described three-phase inverter obtains VD U from photovoltaic power generation apparatus
1; If when there is not described pulse voltage, then described three-phase inverter obtains VD U
0.When illumination is sufficient, the duty ratio of described pulse voltage is high.
Described automatic equalization control inverter comprises: being suitable for three-phase electricity being converted to described VD is U
0three phase rectifier module, and first, second current sensor that is connected with the output of described three phase rectifier module, three-phase inverter respectively, the signals collecting end of described main control module is connected with the signal output part of first, second current sensor described; Described main control module is also suitable for the phase induced current gathered respectively according to the first current sensor or the second current sensor, export corresponding modulation signal, realizing reducing the frequency exporting three-phase voltage when exporting high load capacity to control three-phase inverter, improving the frequency exporting three-phase voltage when exporting underload.Wherein, operationally, the load of its up-down stroke is different to described oil pumper, just because of load is different, namely causes the output load of described inverse control system different; Equally, the difference of load also causes the supply current of the output of described three phase rectifier module or three-phase inverter different, gather the change by this supply current, judge the change of load, the i.e. corresponding modulation signal of described master control module controls, this modulation signal is SPWM signal, regulates its modulation degree can change the duty ratio of SPWM signal, thus plays the effect of regulation output electric voltage frequency.Described automatic equalization control inverter is suitable for being supplied to the maximum power output of oil pumper.
Described photovoltaic power generation apparatus comprises: the photovoltaic battery matrix be connected with grid-connection converter.Described photovoltaic battery matrix is installed on well site of oil field, time by day, solar energy is converted to photovoltaic electric energy and is supplied to grid-connection converter.
Fig. 3 shows the theory diagram three of described inverse control system.
As shown in Figure 3, optionally, described grid-connection converter is also connected with storage battery.Need supporting installation batteries according to scene, unnecessary photovoltaic electric energy can be stored in batteries by grid-connection converter.
When cloudy day or night, photovoltaic battery matrix cannot provide enough electric energy, and the electric energy be stored in batteries can be supplied to automatic equalization control inverter by grid-connection converter.If the electric energy stored in batteries is too low, grid-connection converter cannot provide enough electric energy to automatic equalization control inverter, and automatic equalization control inverter can from utility grid electric energy supplement, and this part electric energy can by electricity-measuring meter metering examination.
Embodiment 2
As shown in Figure 1 to Figure 3, the method of work of a kind of photovoltaic power generation grid-connecting inverse control system on embodiment 1 basis, wherein, described photovoltaic power generation grid-connecting inverse control system comprises: photovoltaic power generation apparatus, and the automatic equalization control inverter that the grid-connection converter in this photovoltaic power generation apparatus is connected, the three-phase output end of described automatic equalization control inverter is connected with well site of oil field load.Described method of work comprises: by described automatic equalization control inverter, the electrical network three-phase electricity of access is converted to VD U
0, and by this VD U
0with the VD U of described grid-connection converter
1compare, the input voltage using the output voltage selecting magnitude of voltage high as three-phase inverter in described automatic equalization control inverter.
Described automatic equalization control inverter comprises: main control module, and the control output end of this main control module is connected with the control end of each switching tube in described three-phase inverter; And input channel selection circuit, it comprises: be suitable for first, second switching tube connecting two output voltages respectively; Described main control module is suitable for VD U
0with VD U
1compare, connect switching tube conducting with the output voltage selecting magnitude of voltage high, input to described three-phase inverter afterwards after filtering to make this output voltage.
Preferably, described by VD U
0with VD U
1compare, the method using the output voltage selecting magnitude of voltage high as the input voltage of three-phase inverter in described automatic equalization control inverter comprises: by described VD U
1in be greater than VD U
0voltage segment be converted to pulse voltage, if when there is described pulse voltage, then described three-phase inverter obtains VD U
1; If when there is not described pulse voltage, then described three-phase inverter obtains VD U
0.
Described automatic equalization control inverter comprises: be suitable for three-phase electricity to be converted to described VD U
0three phase rectifier module, and first, second current sensor that is connected with the output of described three phase rectifier module, three-phase inverter respectively, the signals collecting end of described main control module is connected with the signal output part of first, second current sensor described;
Described method of work also comprises: the phase induced current that described main control module gathers respectively according to the first current sensor or the second current sensor, export corresponding modulation signal, realizing reducing the frequency exporting three-phase voltage when exporting high load capacity to control three-phase inverter, improving the frequency exporting three-phase voltage when exporting underload.Wherein, operationally, the load of its up-down stroke is different to described oil pumper, just because of load is different, namely causes the output load of described inverse control system different; Equally, the difference of load also causes the supply current of the output of described three phase rectifier module or three-phase inverter different, gather the change by this supply current, judge the change of load, the i.e. corresponding modulation signal of described master control module controls, this modulation signal is SPWM signal, regulates its modulation degree can change the duty ratio of SPWM signal, thus plays the effect of regulation output electric voltage frequency.Described automatic equalization control inverter is suitable for being supplied to the maximum power output of oil pumper.
In main control module in embodiment 2, input channel selection circuit and three-phase inverter, each switching tube is in the same manner as in Example 1.
The present invention is not limited to above-described embodiment; on the basis of technical scheme disclosed by the invention; those skilled in the art is according to disclosed technology contents; do not need performing creative labour just can make some to some technical characteristics wherein to replace and distortion, these are replaced and are out of shape all in protection scope of the present invention.
Claims (8)
1. one kind is suitable for the photovoltaic power generation grid-connecting inverse control system of well site of oil field, it is characterized in that, comprise: photovoltaic power generation apparatus, and the automatic equalization control inverter to be connected with the grid-connection converter in this photovoltaic power generation apparatus, the three-phase output end of described automatic equalization control inverter is connected with well site of oil field load; Wherein,
Described automatic equalization control inverter, it is suitable for the electrical network three-phase electricity of access to be converted to VD U
0, and by this VD U
0with the VD U of described grid-connection converter
1compare, the input voltage using the output voltage selecting magnitude of voltage high as three-phase inverter in described automatic equalization control inverter.
2. the photovoltaic power generation grid-connecting inverse control system being suitable for well site of oil field according to claim 1, is characterized in that,
Described automatic equalization control inverter comprises: main control module, and the control output end of this main control module is connected with the control end of each switching tube in described three-phase inverter; And
Input channel selection circuit, it comprises: be suitable for first, second switching tube connecting two output voltages respectively;
Described main control module is suitable for VD U
0with VD U
1compare, connect switching tube conducting with the output voltage selecting magnitude of voltage high, input to described three-phase inverter afterwards after filtering to make this output voltage.
3. the photovoltaic power generation grid-connecting inverse control system being suitable for well site of oil field according to claim 2, is characterized in that,
Described automatic equalization control inverter comprises: be suitable for three-phase electricity to be converted to described VD U
0three phase rectifier module, and first, second current sensor that is connected with the output of described three phase rectifier module, three-phase inverter respectively, the signals collecting end of described main control module is connected with the signal output part of first, second current sensor described;
Described main control module is also suitable for the phase induced current gathered respectively according to the first current sensor or the second current sensor, export corresponding modulation signal, realizing reducing the frequency exporting three-phase voltage when exporting high load capacity to control three-phase inverter, improving the frequency exporting three-phase voltage when exporting underload.
4. the photovoltaic power generation grid-connecting inverse control system being suitable for well site of oil field according to claim 3, is characterized in that,
Described photovoltaic power generation apparatus comprises: the photovoltaic battery matrix be connected with grid-connection converter and storage battery.
5. a method of work for photovoltaic power generation grid-connecting inverse control system, is characterized in that,
Described photovoltaic power generation grid-connecting inverse control system comprises: photovoltaic power generation apparatus, and the automatic equalization control inverter that the grid-connection converter in this photovoltaic power generation apparatus is connected, the three-phase output end of described automatic equalization control inverter is connected with well site of oil field load;
Described method of work comprises: by described automatic equalization control inverter, the electrical network three-phase electricity of access is converted to VD U
0, and by this VD U
0with the VD U of described grid-connection converter
1compare, the input voltage using the output voltage selecting magnitude of voltage high as three-phase inverter in described automatic equalization control inverter.
6. method of work according to claim 5, is characterized in that,
Described automatic equalization control inverter comprises: main control module, and the control output end of this main control module is connected with the control end of each switching tube in described three-phase inverter; And
Input channel selection circuit, it comprises: be suitable for first, second switching tube connecting two output voltages respectively;
Described main control module is suitable for VD U
0with VD U
1compare, connect switching tube conducting with the output voltage selecting magnitude of voltage high, input to described three-phase inverter afterwards after filtering to make this output voltage.
7. method of work according to claim 5, is characterized in that, described by VD U
0with VD U
1compare, the method using the output voltage selecting magnitude of voltage high as the input voltage of three-phase inverter in described automatic equalization control inverter comprises:
By described VD U
1in be greater than VD U
0voltage segment be converted to pulse voltage,
If when there is described pulse voltage, then described three-phase inverter obtains VD U
1;
If when there is not described pulse voltage, then described three-phase inverter obtains VD U
0.
8. method of work according to claim 7, is characterized in that,
Described automatic equalization control inverter comprises: be suitable for three-phase electricity to be converted to described VD U
0three phase rectifier module, and first, second current sensor that is connected with the output of described three phase rectifier module, three-phase inverter respectively, the signals collecting end of described main control module is connected with the signal output part of first, second current sensor described;
Described method of work also comprises: the phase induced current that described main control module gathers respectively according to the first current sensor or the second current sensor, export corresponding modulation signal, realizing reducing the frequency exporting three-phase voltage when exporting high load capacity to control three-phase inverter, improving the frequency exporting three-phase voltage when exporting underload.
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| CN112653119A (en) * | 2020-12-18 | 2021-04-13 | 南京欧陆电气股份有限公司 | Motor microgrid system for oil pumping unit |
| CN114035491A (en) * | 2021-11-05 | 2022-02-11 | 大庆恒驰电气有限公司 | Green intelligent pumping unit system |
| CN114665511A (en) * | 2022-05-27 | 2022-06-24 | 西安海联石化科技有限公司 | Electric quantity energy-saving control method for photoelectric comprehensive energy direct-current power supply system of pumping unit well group |
| US11955782B1 (en) | 2022-11-01 | 2024-04-09 | Typhon Technology Solutions (U.S.), Llc | System and method for fracturing of underground formations using electric grid power |
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| 关俊岭: "西北地区油田偏远井场光伏发电系统的开发与应用", 《石油石化节能与减排》 * |
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| CN107065521A (en) * | 2016-12-23 | 2017-08-18 | 上海致远绿色能源股份有限公司 | A kind of self-adaptation control method for the rectifier for accessing oil machine |
| CN107065521B (en) * | 2016-12-23 | 2020-05-26 | 上海致远绿色能源股份有限公司 | Self-adaptive control method of rectifier connected into oil engine |
| CN112653119A (en) * | 2020-12-18 | 2021-04-13 | 南京欧陆电气股份有限公司 | Motor microgrid system for oil pumping unit |
| CN112653119B (en) * | 2020-12-18 | 2023-08-01 | 南京欧陆电气股份有限公司 | Motor micro-grid system for pumping unit |
| CN114035491A (en) * | 2021-11-05 | 2022-02-11 | 大庆恒驰电气有限公司 | Green intelligent pumping unit system |
| CN114665511A (en) * | 2022-05-27 | 2022-06-24 | 西安海联石化科技有限公司 | Electric quantity energy-saving control method for photoelectric comprehensive energy direct-current power supply system of pumping unit well group |
| US11955782B1 (en) | 2022-11-01 | 2024-04-09 | Typhon Technology Solutions (U.S.), Llc | System and method for fracturing of underground formations using electric grid power |
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| CN104319806B (en) | 2017-01-25 |
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