CN104701856B - A kind of wind farm grid-connected reactive voltage control method - Google Patents
A kind of wind farm grid-connected reactive voltage control method Download PDFInfo
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- CN104701856B CN104701856B CN201510114967.7A CN201510114967A CN104701856B CN 104701856 B CN104701856 B CN 104701856B CN 201510114967 A CN201510114967 A CN 201510114967A CN 104701856 B CN104701856 B CN 104701856B
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 230000033228 biological regulation Effects 0.000 claims description 12
- 239000003990 capacitor Substances 0.000 claims description 10
- 230000004044 response Effects 0.000 claims description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 230000005611 electricity Effects 0.000 description 7
- 230000008859 change Effects 0.000 description 5
- 230000010349 pulsation Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000011217 control strategy Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Classifications
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- H02J3/386—
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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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
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
-
- 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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Abstract
The present invention relates to a kind of wind farm grid-connected reactive voltage control method, for adjusting the reactive voltage on wind farm grid-connected point, comprise the following steps：1) the rated voltage U of wind farm grid-connected point is measuredN, the voltage for setting wind farm grid-connected point controls to determine scope as 1.0UN~1.06UN, it is 1.04U to control definite valueN；2) according to the real-time voltage U for obtaining wind farm grid-connected point in real time, exerting oneself for wind power plant is predicted；3) exerted oneself, wind farm grid-connected reactive voltage is tentatively controlled by the way of throwing/moving back electric capacity, while accurately being controlled using SVG according to real-time voltage U and wind power plant prediction.Compared with prior art, the present invention has good control effect, advanced technology, low cost and other advantages.
Description
Technical field
The present invention relates to a kind of reactive voltage control method, more particularly, to a kind of wind farm grid-connected reactive power/voltage control
Method.
Background technology
Current Large Scale Wind Farm Integration majority operates in constant power factor pattern, and the Reactive-power control ability of Wind turbines in itself is very
Limited, the voltage-regulation of wind farm grid-connected point can only be come by the reactive power compensator of booster stations and ULTC pressure regulation
Realize.Wind farm grid-connected voltage has very strong correlation with active power output level, when the active power output increase of wind power plant,
Wind-powered electricity generation, which sends out feeder line and reactive loss on transformer and voltage loss, all to be increased, and the voltage of wind farm grid-connected point is lacked due to idle
It is weary and reduce；When the active power output of wind power plant is reduced, wind-powered electricity generation sends out feeder line and the reactive loss on transformer and voltage loss
All reduce, wind farm grid-connected voltage rises because idle abundant.Therefore, in wind power plant active power output increase, it is necessary to increase
To the reactive-load compensation amount of wind power plant, to prevent wind farm grid-connected voltage from being reduced because idle not enough；When wind power plant active power output
During reduction, the reactive-load compensation amount to wind power plant should be reduced, to prevent wind farm grid-connected voltage higher because idle superfluous.
The content of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of control effect is good, skill
The wind farm grid-connected reactive voltage control method that art is advanced, cost is low.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of wind farm grid-connected reactive voltage control method, for adjusting the reactive voltage on wind farm grid-connected point,
Comprise the following steps：
1) the rated voltage U of wind farm grid-connected point is measuredN, the voltage for setting wind farm grid-connected point controls to determine scope as 1.0UN
~1.06UN, it is 1.04U to control definite valueN；
2) according to the real-time voltage U for obtaining wind farm grid-connected point in real time, exerting oneself for wind power plant is predicted；
3) exerted oneself according to real-time voltage U and wind power plant prediction, it is idle to wind farm grid-connected point by the way of throwing/moving back electric capacity
Voltage is tentatively controlled, while accurately being controlled using SVG.
Described step 3) specifically include following steps：
31) judge whether real-time voltage U is in 1.0UN~1.06UNIn the range of, if so, then carrying out step 32), it is such as no,
Then carry out step 33)；
32) reactive voltage of wind farm grid-connected point is adjusted using SVG, makes real-time voltage U approach control definite values
1.04UN；
33) judge whether real-time voltage U is more than or equal to 1.06UN, if so, then carrying out step 34), if it is not, then carrying out
35)；
34) as wind power plant prediction continuation of exerting oneself is reduced, capacitor input reactor is exited in packet successively, and using there is load
Adjustable transformer carries out pressure regulation as standby regulator, makes real-time voltage U approach control definite values 1.04UN；
35) when real-time voltage U is less than 1.0UNWhen, exerted oneself with wind power plant prediction and continue to increase, successively packet input electric capacity
Device exits reactor, makes real-time voltage U approach control definite values 1.04UN。
Described capacitor is secondary capacitor.
Described reactor is low tension reactor.
Described SVG include igbt and gate pole can Guan Jingguan, and the response time is 20ms-100ms.
Compared with prior art, the present invention has advantages below：
First, control effect is good：The control strategy that this method is combined using preliminary control and accurate two kinds of control modes of control,
Can be by the voltage stabilization of wind power plant access point in 1.0UN~1.06UNIt is interior, and then meet the safety standard of national grid.
2nd, advanced technology, cost are low：Capacitor and reactor are used in preliminary control, SVG is used during accurate control,
SVG fast response times, floor space is small, and cost high adjustment effect is good.
Brief description of the drawings
Fig. 1 is flow chart of the method for the present invention.
Fig. 2 combines the method flow diagram accurately controlled for preliminary control.
Embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment：
Wind farm grid-connected reactive power/voltage control, i.e., each wind farm grid-connected point is carried out using the reactive-load compensation equipment installed
Reactive power/voltage control.According to national regulation, each wind farm grid-connected point should be equipped with all kinds of reactive-load compensation equipments, such as shunt capacitor,
Reactor, SVC, SVG etc., and wind power plant booster stations transformer should be load regulation transformer.
The active power output of wind power plant has very strong fluctuation and unstability, the active power output fluctuating range pair of wind power plant
Wind farm grid-connected voltage characteristic has a significant impact.When wind power plant active power output amplitude of variation is big, wind farm grid-connected voltage wave
Dynamic amplitude is also larger, and wind power plant active power output amplitude of variation hour, wind farm grid-connected voltage pulsation amplitude is also smaller.Wind-powered electricity generation goes out
Power quickly may significantly rise or fall in the short period of time, on the voltage for being reflected in wind farm grid-connected point, be exactly electricity
Press and be widely varied and be widely varied with the quick of output of wind electric field.
Wind power output fluctuating range than it is larger when, in order to which control voltage is stable, it is necessary to put into the reactive-load compensation dress of Large Copacity
Put.Low-voltage capacitance, reactor have capacity big, and cost is low, the flexible compensation characteristic of grouping switching, but low-voltage capacitance, reactance
Device generally by breaker access system, can only grouping switching, and the operating time is long, it is impossible to realize idle quick continuous adjust
Section, the reactive-load compensation of step evolution can only be carried out to system, therefore is suitable as the basic component of reactive-load compensation, gone out greatly for wind-powered electricity generation
Reactive voltage coarse adjustment when power changes in amplitude is fluctuated.
, it is necessary to which less Reactive-power control amount can meet Reactive-power control requirement when wind power output fluctuating range is smaller, and it is small
Amplitude wind power output pace of change is fast, fluctuation from quick continuity reactive-load adjusting device frequently, it is necessary to carry out reactive voltage
Control.SVG can the device that can turn off rapidly such as Guan Jingguan (GTO), Ke Yishi using igbt (IGBT), gate pole
Existing rapid succession regulation reactive power, the response time is most fast can to accomplish 20ms--100ms, can be used in stabilizing wind-powered electricity generation small
The voltage pulsation for the wind farm group grid entry point that amplitude rapid fluctuations are caused, improves system power quality.But the general capacity of SVG compared with
It is small, and unit capacity cost is higher, therefore trim component is suitable as, made for the change quick by a small margin that regulating wind power is exerted oneself
Into voltage pulsation, and capacity reactance device to significantly voltage pulsation carry out coarse adjustment after voltage trim.SVG quick responses
Characteristic, makes it have when system is by large disturbances such as short troubles there is provided the support of quick reactive voltage, improves the electricity of system
Press stability.Under the conditions of System Reactive Power is abundant, the ULTC (OLTC) of wind power plant booster stations can pass through adjustment
Tap changes the reactive power distribution of system, to transformer medium voltage side and low voltage regulation, and the pressure regulation to high-voltage side bus is acted on
It is very limited, and OLTC no more than 3 grades of each continuous action gear of tap gear, total gear is acted daily no more than 4
Shelves, therefore, the auxiliary pressure regulation means that OLTC can only be adjusted as reactive-load compensation equipment.
As shown in figure 1, a kind of wind farm grid-connected reactive voltage control method, for adjusting on wind farm grid-connected point
Reactive voltage, comprises the following steps：
1) basis《State Grid Corporation of China's power system voltage quality and var administrative standard》It is defined to require,
During the 220kV bus normal operating modes of 220kV, 110kV transformer station, voltage tolerance for system nominal voltage -3%~
+ 7%, 330kV transformer station high voltage bus day voltage fluctuation rate is no more than 3%, 220kV Power Plant Substations high voltage bus day voltage
Stability bandwidth is no more than 3.5%, determines therefrom that the voltage daily fluctuation rate of wind farm grid-connected point is controlled 3%.According to《Wind power plant is accessed
Electric power network technique is provided》, wind power plant should be able to be in its range of capacity, and wind farm grid-connected voltage of control is -the 3% of rated voltage
~+7%, i.e. 0.97UN~1.07UN, in view of wind farm grid-connected point certain margin of safety should be stayed, determine wind farm grid-connected point
Voltage controls to determine scope and is 1.0UN~1.06UN, determines to control definite value to be 1.04UN；
2) according to the real-time voltage U for obtaining wind farm grid-connected point in real time, exerting oneself for wind power plant is predicted；
3) exerted oneself according to real-time voltage U and wind power plant prediction, it is idle to wind farm grid-connected point by the way of throwing/moving back electric capacity
Voltage is tentatively controlled, while accurately being controlled using SVG, as shown in Fig. 2 specifically including following steps：
31) judge whether real-time voltage U is in 1.0UN~1.06UNIn the range of, if so, then carrying out step 32), it is such as no,
Then carry out step 33)；
32) reactive voltage of wind farm grid-connected point is adjusted using SVG, makes real-time voltage U approach control definite values
1.04UN；
33) judge whether real-time voltage U is more than or equal to 1.06UN, if so, then carrying out step 34), if it is not, then carrying out
35)；
34) as wind power plant prediction continuation of exerting oneself is reduced, capacitor input reactor is exited in packet successively, and using there is load
Adjustable transformer carries out pressure regulation as standby regulator, makes real-time voltage U approach control definite values 1.04UN；
35) when real-time voltage U is less than 1.0UNWhen, exerted oneself with wind power plant prediction and continue to increase, successively packet input electric capacity
Device exits reactor, makes real-time voltage U approach control definite values 1.04UN。
In summary, wind power plant suggestion installs the reactive power compensators such as low-voltage capacitance, reactor and SVG and carries out integrating tune
Pressure.Low-voltage capacitance, reactor flexibly but are unable to the step compensation rate of frequent operation as grouping switching, should be used as idle point of basis
Amount, wind farm grid-connected voltage change caused by change of significantly being exerted oneself to wind power plant carries out coarse adjustment, is become according to wind power output
Change prediction, grouping switching low-voltage capacitance carries out pressure regulation according to plan.Wind power plant is concentrated caused by changing by a small margin for wind power output
The frequent fluctuation of grid entry point voltage, it is proposed that action is entered as trim component using the SVG with quick continuous reactive regulating power
State is adjusted.
Claims (1)
1. a kind of wind farm grid-connected reactive voltage control method, for adjusting the reactive voltage on wind farm grid-connected point, its
It is characterised by, comprises the following steps：
1) the rated voltage U of wind farm grid-connected point is measuredN, the control reference voltage of wind farm grid-connected point is set as 1.0UN~
1.06UN, it is 1.04U to control definite valueN；
2) according to the real-time voltage U for obtaining wind farm grid-connected point in real time, exerting oneself for wind power plant is predicted；
3) exerted oneself according to real-time voltage U and wind power plant prediction, to wind farm grid-connected reactive voltage by the way of throwing/moving back electric capacity
Tentatively controlled, while accurately being controlled using SVG, grid entry point voltage is in the control range of setting, it is described
Step 3) specifically include following steps：
31) judge whether real-time voltage U is in 1.0UN~1.06UNIn the range of, if so, then carrying out step 32), if not, entering
Row step 33)；
32) reactive voltage of wind farm grid-connected point is adjusted using SVG, makes real-time voltage U approach control definite values 1.04UN；
33) judge whether real-time voltage U is more than or equal to 1.06UN, if so, then carrying out step 34), if it is not, then carrying out 35)；
34) exerted oneself with wind power plant prediction and continue to reduce, capacitor input reactor is exited in packet successively, and uses on-load voltage regulation
Transformer carries out pressure regulation as standby regulator, makes real-time voltage U approach control definite values 1.04UN；
35) when real-time voltage U is less than 1.0UNWhen, exerted oneself with wind power plant prediction and continue to increase, packet input capacitor is moved back successively
Go out reactor, make real-time voltage U approach control definite values 1.04UN,
Described capacitor is secondary capacitor, and described reactor is low tension reactor, and described SVG includes insulated gate bipolar
Transistor and gate pole can Guan Jingguan, and the response time is 20ms-100ms.
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| CN105337318B (en) * | 2015-10-20 | 2019-08-16 | 国家电网公司 | Wind turbines generator operation as synchronous condenser aptitude tests method and system |
| CN105356477B (en) * | 2015-11-30 | 2019-01-25 | 国家电网公司 | A kind of large-scale wind electricity cluster and its VAR plan method for sending out channel |
| CN107026455A (en) * | 2017-05-15 | 2017-08-08 | 中国电力科学研究院 | Dynamic reactive control method for coordinating and system that a kind of wind power plant high pressure is passed through |
| CN109842144A (en) * | 2017-11-27 | 2019-06-04 | 中国电力科学研究院有限公司 | A kind of combination control method and system solving high-voltage ride through of wind power generating set |
| CN110601251B (en) * | 2018-06-13 | 2021-06-08 | 新疆金风科技股份有限公司 | Voltage prediction method and device in wind power plant |
| CN113013891A (en) * | 2021-04-29 | 2021-06-22 | 国网山东省电力公司安丘市供电公司 | Transformer area reactive power compensation system and method |
| CN113765148B (en) * | 2021-07-27 | 2023-08-18 | 中国电力科学研究院有限公司 | Method and system for improving voltage control capability of wind power station based on coordination control |
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| JP4908192B2 (en) * | 2006-12-28 | 2012-04-04 | 株式会社東芝 | Reactive power compensation apparatus and method |
| CN102195294B (en) * | 2011-05-16 | 2014-09-10 | 中电普瑞科技有限公司 | Wind farm reactive comprehensive optimization control method |
| CN102856911B (en) * | 2012-09-12 | 2014-08-20 | 清华大学 | Control method for access of dynamic reactive power compensation device to power transmission grid |
| CN103199542B (en) * | 2013-02-26 | 2015-06-10 | 国家电网公司 | Method of optimal control of wind power plant reactive voltage |
| CN103701134B (en) * | 2014-01-09 | 2016-09-14 | 武汉大学 | Wind farm grid-connected point voltage control method based on MCR Yu electric capacity mixed compensation |
| CN104348162B (en) * | 2014-10-10 | 2016-08-17 | 国家电网公司 | 330kV wind energy turbine set collects control method of transformer station voltage |
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