CN109193764A - A kind of photovoltaic plant idle work optimization method based on self study identification - Google Patents
A kind of photovoltaic plant idle work optimization method based on self study identification Download PDFInfo
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- CN109193764A CN109193764A CN201811072793.2A CN201811072793A CN109193764A CN 109193764 A CN109193764 A CN 109193764A CN 201811072793 A CN201811072793 A CN 201811072793A CN 109193764 A CN109193764 A CN 109193764A
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- 238000005457 optimization Methods 0.000 title claims abstract description 24
- 210000000051 wattle Anatomy 0.000 claims abstract description 9
- 230000005611 electricity Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
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Classifications
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- H02J3/383—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/50—Controlling the sharing of the out-of-phase component
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The present invention relates to technical field of electric power, in particular to a kind of photovoltaic plant idle work optimization method based on self study identification.The method includes the steps of: recognizing the system impedance X between photovoltaic plant and power grid by self study method；Judge the validity and reasonability of system impedance X；Calculate photovoltaic plant wattles power economic equivalent target value Qtarget.Advantages of the present invention: (1) self study recognizes, intelligent.(2) method is simple, effective.(3) real-time optimization.(4) the voltage support dynamics of system improves, and network loss reduces.
Description
Technical field
The present invention relates to technical field of electric power, in particular to a kind of photovoltaic plant idle work optimization side based on self study identification
Method.
Background technique
The economy and power quality and reactive power of Operation of Electric Systems have great relationship.Reactive power is power train
Unified kind of indispensable power.Reactive power loss in a large amount of inductive load and power grid, it is desirable that system provides enough
Reactive power, otherwise network voltage will decline, and power quality cannot be guaranteed.Meanwhile the unreasonable distribution of reactive power, also will
It causes line loss to increase, reduces the economy of Operation of Electric Systems.
Idle work optimization is exactly in the case where system network architecture and given system loading, is to be by adjusting control variable
System network loss in the case where meeting various constraints and adjusting reaches minimum, not only transports whole power near rated value by idle work optimization
Row, and can be improved electrical network economy benefit, power quality.
Existing photovoltaic plant is provided solely for own reactive loss, seldom considers to send out the reactive loss of route and sends out route
Terminal voltage, this control mode not only waste the idle fan-out capability of photovoltaic plant itself, also influence photovoltaic plant and send
When the conveying capacity of route out, especially photovoltaic plant send out route access weakness power grid through long-distance, such as Qinghai Province west
Photovoltaic power station group, the power loss and terminal voltage for sending out route all have larger impact to self generating and grid stability.
Therefore, photovoltaic plant there are the problem of: quality of voltage is not ideal enough, and voltage fluctuation is excessive when load peak valley.
And influence voltage level key factor is reactive power, the reasonable layout of reactive power is to guarantee quality of voltage
Primary condition.On the one hand, idle surplus will raise system voltage, it is superfluous it is idle flow in systems, can not only be lost
Function power occupies transmission line of electricity and place capacity, and can generate voltage landing on the line, influences quality of voltage and stabilization
Property.On the other hand, idle deficiency will lead to system voltage reduction, and electrical equipment cannot make full use of, and too low voltage level is very
To will lead to the major accidents such as collapse of voltage.So the Rational flow that control is idle, keeps reactive balance, not only can guarantee voltage
Quality, improves the safety and stability of system operation, and can reduce electric energy loss, obtains economic benefit.Therefore, idle excellent
It is turned to an important component of photoelectricity Electric Power Network Planning, by reactive compensation, network voltage control may be implemented, improve electricity
Net stability reduces via net loss and guarantees there is wider operation nargin.
Summary of the invention
Technical problem to be solved by the invention is to provide photovoltaic plant idle work optimization methods, for improving photovoltaic plant
Idle work optimization application improves the voltage support dynamics of system to optimize own reactive power target value, and network loss reduces.
In order to achieve the above objectives, the technical solution adopted by the present invention are as follows:
A kind of photovoltaic plant idle work optimization method based on self study identification, the method includes the steps of:
The system impedance X between photovoltaic plant and power grid is recognized by self study method；
Judge the validity and reasonability of system impedance X；
Calculate photovoltaic plant wattles power economic equivalent target value Qtarget。
Further, the system impedance X by between self study method identification photovoltaic plant and power grid includes:
If before the S times adjustment, photovoltaic plant high voltage bus voltage is US-, issuing idle to system is QS-；Photovoltaic after adjustment
Power station high voltage bus voltage is US+, issuing idle to system is QS+, then have:
(QS+/US+-QS-/US-) X=(US+-US-)；
It records, then has equipped with T adjustment:
It writes a Chinese character in simplified form are as follows: [△ Q/U] X=[△ U].
Both sides are multiplied by [△ Q/U]T, it can be obtained after arrangement:
Wherein, US-High voltage bus voltage, Q before being adjusted for the S timesS-It issues for the S times adjustment forward direction system without work value, US+
For high voltage bus voltage after the S times adjustment, QS+To be issued to system without work value after the S times adjustment.
Further, the validity and reasonability of the judgement system impedance X includes: Xmin≤X≤Xmax；
Wherein, Xmin=0；
Xmax=1.5LX1, L is that photovoltaic plant sends out line length, X1Route unit length is sent out for photovoltaic plant
Impedance；
When system impedance cannot be picked out, X=X is takenmax。
Further, the value range of the T are as follows: 3≤T≤9.
Further, the value of the T is 5.
Further, the front and back of identification system impedance 0.5% bus voltage rating of voltage difference > twice.
Further, the calculating photovoltaic plant wattles power economic equivalent target value QtargetIt is calculated by following formula:
Wherein, UtargetFor photovoltaic electric station grid connection point voltage-target, UmeaFor photovoltaic electric station grid connection point voltage real value,
QmeaFor the idle real value of photovoltaic electric station grid connection point.
Photovoltaic plant idle work optimization method provided by the invention based on self study identification, first identification photovoltaic plant and electricity
System impedance X between net, and judge the validity and reasonability of system impedance X；Photovoltaic is calculated according to determining system impedance X
Power station wattles power economic equivalent target value Qtarget, method is simple and effectively.
Photovoltaic plant idle work optimization method provided by the invention based on self study identification, between photovoltaic plant and power grid
System impedance X determines that adjustment number T is one and rolls forward process by self study method identification intelligence, ensure that identification
Real-time and validity.
Compared with prior art, the photovoltaic plant idle work optimization method provided by the invention based on self study identification is excellent
Point:
(1) self study recognizes, intelligent.
(2) method is simple, effective.
(3) real-time optimization.
(4) the voltage support dynamics of system improves, and network loss reduces.
Detailed description of the invention
Fig. 1 is a kind of photovoltaic plant idle work optimization method flow diagram based on self study identification of the present invention.
Specific embodiment
A kind of photovoltaic plant idle work optimization method based on self study identification, the method includes the steps of:
The system impedance X between photovoltaic plant and power grid is recognized by self study method；
Judge the validity and reasonability of system impedance X；
Calculate photovoltaic plant wattles power economic equivalent target value Qtarget。
Further, the system impedance X by between self study method identification photovoltaic plant and power grid includes:
If before the S times adjustment, photovoltaic plant high voltage bus voltage is US-, issuing idle to system is QS-；Photovoltaic after adjustment
Power station high voltage bus voltage is US+, issuing idle to system is QS+, then have:
(QS+/US+-QS-/US-) X=(US+-US-)；
It records, then has equipped with T adjustment:
It writes a Chinese character in simplified form are as follows: [△ Q/U] X=[△ U].
Both sides are multiplied by [△ Q/U]T, it can be obtained after arrangement:
Wherein, US-High voltage bus voltage, Q before being adjusted for the S timesS-It issues for the S times adjustment forward direction system without work value, US+
For high voltage bus voltage after the S times adjustment, QS+To be issued to system without work value after the S times adjustment.
Further, the validity and reasonability of the judgement system impedance X includes: Xmin≤X≤Xmax；
Wherein, Xmin=0；
Xmax=1.5LX1, L is that photovoltaic plant sends out line length, X1Route unit length is sent out for photovoltaic plant
Impedance；
When system impedance cannot be picked out, X=X is takenmax。
Further, the value range of the T are as follows: 3≤T≤9.
Further, the value of the T is 5.
Further, the front and back of identification system impedance 0.5% bus voltage rating of voltage difference > twice.
Further, the calculating photovoltaic plant wattles power economic equivalent target value QtargetIt is calculated by following formula:
Wherein, UtargetFor photovoltaic electric station grid connection point voltage-target, UmeaFor photovoltaic electric station grid connection point voltage real value,
QmeaFor the idle real value of photovoltaic electric station grid connection point.
Embodiment 1
A kind of photovoltaic plant idle work optimization method based on self study identification, the method includes the steps of:
The system impedance X between photovoltaic plant and power grid is recognized by self study method；Include:
If before the S times adjustment, photovoltaic plant high voltage bus voltage is US-, issuing idle to system is QS-；Photovoltaic after adjustment
Power station high voltage bus voltage is US+, issuing idle to system is QS+, then have:
(QS+/US+-QS-/US-) X=(US+-US-)；
It records, then has equipped with T adjustment:
It writes a Chinese character in simplified form are as follows: [△ Q/U] X=[△ U].
Both sides are multiplied by [△ Q/U]T, it can be obtained after arrangement:
Wherein, US-High voltage bus voltage, Q before being adjusted for the S timesS-It issues for the S times adjustment forward direction system without work value, US+
For high voltage bus voltage after the S times adjustment, QS+To be issued to system without work value after the S times adjustment.
Judge the validity and reasonability of system impedance X；It include: Xmin≤X≤Xmax；
Wherein, Xmin=0；
Xmax=1.5LX1, L is that photovoltaic plant sends out line length, X1Route unit length is sent out for photovoltaic plant
Impedance；
When system impedance cannot be picked out, X=X is takenmax。
The front and back of identification system impedance 0.5% bus voltage rating of voltage difference > twice.
Calculate photovoltaic plant wattles power economic equivalent target value Qtarget, formula calculating:
Wherein, UtargetFor photovoltaic electric station grid connection point voltage-target, UmeaFor photovoltaic electric station grid connection point voltage real value,
QmeaFor the idle real value of photovoltaic electric station grid connection point.
The preferred embodiment of the present invention has been described above in detail, still, during present invention is not limited to the embodiments described above
Detail within the scope of the technical concept of the present invention can be with various simple variants of the technical solution of the present invention are made, this
A little simple variants all belong to the scope of protection of the present invention.
It is further to note that specific technical features described in the above specific embodiments and step,
In the case of no contradiction, it can be combined in any appropriate way, in order to avoid unnecessary repetition, the present invention couple
No further explanation will be given for various combinations of possible ways.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally
The thought of invention, it should also be regarded as the disclosure of the present invention.
Claims (7)
1. a kind of photovoltaic plant idle work optimization method based on self study identification, which is characterized in that the method includes the steps of:
The system impedance X between photovoltaic plant and power grid is recognized by self study method；
Judge the validity and reasonability of system impedance X；
Calculate photovoltaic plant wattles power economic equivalent target value Qtarget。
2. a kind of photovoltaic plant idle work optimization method based on self study identification according to claim 1, it is characterised in that:
It is described system impedance X between photovoltaic plant and power grid is recognized by self study method to include:
If before the S times adjustment, photovoltaic plant high voltage bus voltage is US-, issuing idle to system is QS-；Photovoltaic plant after adjustment
High voltage bus voltage is US+, issuing idle to system is QS+, then have:
(QS+/US+-QS-/US-) X=(US+-US-)；
It records, then has equipped with T adjustment:
It writes a Chinese character in simplified form are as follows: [△ Q/U] X=[△ U].
Both sides are multiplied by [△ Q/U]T, it can be obtained after arrangement:
Wherein, US-High voltage bus voltage, Q before being adjusted for the S timesS-It issues for the S times adjustment forward direction system without work value, US+For S
High voltage bus voltage, Q after secondary adjustmentS+To be issued to system without work value after the S times adjustment.
3. a kind of photovoltaic plant idle work optimization method based on self study identification according to claim 1, it is characterised in that:
The validity and reasonability of the judgement system impedance X includes: Xmin≤X≤Xmax；
Wherein, Xmin=0；
Xmax=1.5LX1, L is that photovoltaic plant sends out line length, X1The resistance of route unit length is sent out for photovoltaic plant
It is anti-；
When system impedance cannot be picked out, X=X is takenmax。
4. a kind of photovoltaic plant idle work optimization method based on self study identification according to claim 3, it is characterised in that:
The value range of the T are as follows: 3≤T≤9.
5. a kind of photovoltaic plant idle work optimization method based on self study identification according to claim 3, it is characterised in that:
The value of the T is 5.
6. a kind of photovoltaic plant idle work optimization method based on self study identification according to claim 3, it is characterised in that:
The front and back of identification system impedance 0.5% bus voltage rating of voltage difference > twice.
7. a kind of photovoltaic plant idle work optimization method based on self study identification according to claim 1, it is characterised in that:
The calculating photovoltaic plant wattles power economic equivalent target value QtargetIt is calculated by following formula:
Wherein, UtargetFor photovoltaic electric station grid connection point voltage-target, UmeaFor photovoltaic electric station grid connection point voltage real value, QmeaFor
Real value that photovoltaic electric station grid connection point is idle.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101299587A (en) * | 2008-06-27 | 2008-11-05 | 上海惠安系统控制有限公司 | Electric power telemechanical device RTU and method for implementing automatic voltage control of generating plant |
| CN102868167A (en) * | 2012-09-11 | 2013-01-09 | 南京中德保护控制系统有限公司 | Reactive voltage control method of photovoltaic power station |
| CN102969722A (en) * | 2012-11-12 | 2013-03-13 | 南京中德保护控制系统有限公司 | Wind farm reactive voltage control method |
| CN103401247A (en) * | 2013-06-27 | 2013-11-20 | 国电南瑞南京控制系统有限公司 | Optimization method for realizing automatic generation control (AGC) and automatic voltage control (AVC) in monitoring system of boosting station of power plant |
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2018
- 2018-09-14 CN CN201811072793.2A patent/CN109193764A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101299587A (en) * | 2008-06-27 | 2008-11-05 | 上海惠安系统控制有限公司 | Electric power telemechanical device RTU and method for implementing automatic voltage control of generating plant |
| CN102868167A (en) * | 2012-09-11 | 2013-01-09 | 南京中德保护控制系统有限公司 | Reactive voltage control method of photovoltaic power station |
| CN102969722A (en) * | 2012-11-12 | 2013-03-13 | 南京中德保护控制系统有限公司 | Wind farm reactive voltage control method |
| CN103401247A (en) * | 2013-06-27 | 2013-11-20 | 国电南瑞南京控制系统有限公司 | Optimization method for realizing automatic generation control (AGC) and automatic voltage control (AVC) in monitoring system of boosting station of power plant |
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Application publication date: 20190111 |