CN109066789A - A kind of wind power plant fault traversing control method based on synchronous capacitor - Google Patents
A kind of wind power plant fault traversing control method based on synchronous capacitor Download PDFInfo
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- 239000003990 capacitor Substances 0.000 title claims abstract description 54
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- 230000008030 elimination Effects 0.000 claims abstract description 5
- 238000003379 elimination reaction Methods 0.000 claims abstract description 5
- 238000011897 real-time detection Methods 0.000 claims abstract description 4
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- 238000010248 power generation Methods 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
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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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- 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
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Abstract
The wind power plant fault traversing control method based on synchronous capacitor that the invention discloses a kind of, wind farm grid-connected ac voltage of real-time detection when determining to occur Voltage Drop failure, start synchronous capacitor；It is poor that grid entry point alternating voltage per unit value and specified per unit value are made, after difference clipping, progress PI control, and the difference that obtains that treated；By treated, difference is added with voltagerating per unit value, obtain the input value of exciter in synchronous capacitor, exciter changes the output reactive power of synchronous capacitor by the change according to input value, draw high grid entry point voltage, until Voltage Drop Failure elimination, synchronous capacitor is closed, fault traversing is completed.The present invention realizes wind power plant fault traversing in practice, solves the problems, such as voltage overshoot after failure, and be suitable for the wind power plant of different type wind-driven generator composition.
Description
Technical field
The invention belongs to electric power system and its automation field, in particular to a kind of wind power plant event based on synchronous capacitor
Hinder traversing control method.
Background technique
Since 21 century, since wind energy has a very wide distribution, the advantages that wind generating technology is mature and cost is relatively low, wind-powered electricity generation dress
Machine capacity is rapidly developed, and wind-power electricity generation has become the third-largest power generation of the China in addition to thermal power generation and hydroelectric generation
The representative energy in mode, with generation of electricity by new energy.
As proportion is increasing in power grid for wind-power electricity generation, national grid regulation wind power plant during failure needs to have
Standby certain fault ride-through capacity.After wind farm grid-connected point breaks down, grid entry point alternating voltage falls.Mainstream wind at present
All contain AC-DC-ac transmission portion in power generator group dual-feed asynchronous wind power generator and permanent magnet synchronous wind generator
Point, the reduction of alternating voltage will lead to voltage in DC line and increase, and seriously affect the safe and stable operation of Wind turbines.And therefore
Alternating voltage can have a degree of voltage overshoot after barrier terminates, so that alternating voltage is more than its load voltage value, for
The safe and stable operation of wind power plant equally has certain influence.
It is directed to the fault traversing problem of wind power plant at present, solution mainly has: " braking resistor in parallel is to constant-speed and constant-frequency wind
The promotion of machine low voltage ride-through capability " (Liu Decai, Lv Chunhui, communication power supply technology, 2013,30 (06): 32-36.) propose it is logical
It crosses and reduces the reactive power that wind power plant absorbs using braking resistor in parallel, to improve fault ride-through capacity.This method is only applicable to
Constant-speed and constant-frequency unit, dual-feed asynchronous wind power generator and the permanent magnet synchronous wind generator iso-variable velocity for not being suitable for current mainstream are permanent
Frequency unit；" Crowbar protects the application in double-fed asynchronous wind generator system fault ride-through of power grid " (Marvin's dragon electric power is certainly
Dynamicization equipment, 2011,31 (07): 127-130.) it proposes that crowbar circuit is added in double fed asynchronous wind power generator rotor side, it can be with
Realize the requirement of not off-grid operation, but crowbar circuit will lead to double-fed unit and operate in squirrel-cage asynchronism Generator Status, thus
A large amount of reactive powers are absorbed, to deteriorate grid entry point voltage, and are not suitable for other wind power generating sets；" direct driving speed-changing is permanent
Frequency wind generator system low voltage crossing research " (Zhang Xianping power converter technology, 2010 (04): 28-31.) propose to forever
Energy consumption property crowbar circuit is added on DC line and absorbs the active power that can not be transmitted for magnetic-synchro wind-driven generator, to realize
Fault traversing, this method are not suitable for other wind power generating sets equally.And both the above method requires in wind power plant often
Installation auxiliary device on one wind-driven generator, cost is larger, is not easy to realize." static synchronous compensator enhances the low of wind power plant
The applied analysis of voltage ride through ability " (Qian Yeniu, Qiang Sheng, Hu Xing wait Guangdong Electric Power, 2012,25 (08): 73-79+112) mention
Reactive compensation is carried out to draw high false voltage to route using static synchronous compensator out, but Static Synchronous reactive-load compensator designs
Manufacture is complicated, at high cost.
Summary of the invention
The purpose of the present invention is to provide a kind of wind power plant fault traversing control method based on synchronous capacitor, Neng Gou
Fault traversing is realized in practice, and is suitable for the wind power plant of different type wind-driven generator composition.
The technical solution for realizing the aim of the invention is as follows: a kind of wind power plant fault traversing control based on synchronous capacitor
Method, comprising the following steps:
Wind farm grid-connected ac voltage of step 1, real-time detection, when determining to occur Voltage Drop failure, starting is synchronized
Phase modifier；
Step 2, grid entry point alternating voltage per unit value and specified per unit value are made it is poor, after difference clipping, progress PI control,
The difference that obtains that treated；
Step 3, by treated, difference is added with voltagerating per unit value, obtains the input of exciter in synchronous capacitor
Value, exciter are changed the output reactive power of synchronous capacitor by the change according to input value, draw high grid entry point voltage；
Step 4 repeats step 2-3, until Voltage Drop Failure elimination, closes synchronous capacitor, completes fault traversing.
Compared with prior art, the present invention its remarkable advantage is: 1) present invention haves no need to change the control of wind-driven generator
Mode processed, the wind power plant no matter formed for which kind of wind-driven generator are all suitable for；2) present invention is not needed to separate unit wind-power electricity generation
Machine adds auxiliary device, save the cost；3) present invention increases and decreases the reactive power that synchronous capacitor exports by the quick excitation that adjusts,
Capacity is larger and idle export not will receive the influence of operation of power networks state, improves the stability of alternating voltage, reduces simultaneously
Construction cost；4) present invention can solve the alternating voltage overshoot problem after failure, realize the quick of grid entry point voltage
Stablize.
Detailed description of the invention
Fig. 1 is the wind power plant fault traversing control method flow chart the present invention is based on synchronous capacitor.
Fig. 2 is the wind farm grid-connected fault traversing system schematic the present invention is based on synchronous capacitor.
Fig. 3 is synchronous capacitor starting of the present invention and locking schematic diagram.
Fig. 4 is the control block diagram of exciter input of the present invention.
Fig. 5 is grid entry point voltage-contrast figure of the present invention.
Specific embodiment
In the following with reference to the drawings and specific embodiments, the present invention program is further illustrated.
As shown in Figure 1, the present invention proposes a kind of wind power plant fault traversing control method based on synchronous capacitor, comprising with
Lower step:
Wind farm grid-connected ac voltage of step 1, real-time detection, determines whether to occur Voltage Drop failure, if so,
Start synchronous capacitor, carries out the control of wind power plant fault traversing.
Fig. 2 is the wind farm grid-connected fault traversing system schematic based on synchronous capacitor, includes master at present in wind power plant
Flow dual-feed asynchronous wind power generator group and two kinds of wind power generating sets of permanent magnet synchronous wind generator group.Since wind speed has seriously
Fluctuation and uncertain, wind speed changes the variation that will lead to wind power generating set output voltage, so the wind of actual motion
Voltage fuctuation within a narrow range is more in electric field, therefore is designed to breakdown judge link.
Fig. 3 is that synchronous capacitor starts and is latched schematic diagram, when grid entry point Voltage Drop is no more than setting discrimination threshold,
Determine that fuctuation within a narrow range occurs for wind power plant, does not influence the normal safe and stable operation of wind power plant.As a kind of specific embodiment, setting
Discrimination threshold is 0.1pu, i.e., when grid entry point Voltage Drop is more than 0.1pu, determines to break down.
It is more than 0.1pu since transient state various in power grid or wind power plant reaction may result in grid entry point Voltage Drop, but
The transient disturbance time is shorter, does not influence wind power plant normal operation, so delay is added in breakdown judge link, when grid entry point voltage
Falling is more than given threshold, and is maintained after setting delay, judges that grid entry point breaks down, and starts synchronous capacitor, closure
Breaker BRK between synchronous capacitor and grid entry point.As a kind of specific embodiment, setting delay is 0.05s, when grid-connected
Point Voltage Drop is more than 0.1pu, and after maintaining 0.05s, judges that grid entry point breaks down.
Step 2, grid entry point alternating voltage per unit value and specified per unit value are made it is poor, after difference clipping, progress PI control,
The difference that obtains that treated.
Electric system actually uses voltage transformer and detects line voltage distribution, and voltage transformer output is that line voltage distribution is famous
Value, and exciter input is per unit value, so the line voltage distribution mark that need to be will test is changed, is then handled, i.e., it will simultaneously
It is poor that site alternating voltage per unit value and specified per unit value are made；Then difference is subjected to amplitude limiting processing, prevents from going out under special circumstances
Now beyond the difference except synchronous capacitor regulating power；PI adjusting, acceleration synchronization phase modifier are carried out to the difference after clipping again
Reactive power compensation speed, reduce failure at the end of voltage over control, realize grid entry point voltage fast and stable.
Step 3, by treated, difference is added with voltagerating per unit value, obtains the input of exciter in synchronous capacitor
Value, exciter are changed the output reactive power of synchronous capacitor by the change according to input value, draw high grid entry point voltage.
The normal input value of the input port of exciter is the specified per unit value of grid entry point alternating voltage, using the value as input
When, synchronous capacitor is not quick enough for the lifting of grid entry point alternating voltage, and overshoot occurs in grid entry point voltage after failure, no
Energy Quick-return is stablized.According to the relationship of exciter input and synchronous capacitor output, i.e. exciter input value is obtained with detection
When line voltage distribution per unit value is identical, EF value can maintain 1, i.e. synchronous capacitor not adjusting circuit voltage at this time.When exciter is defeated
Entering value and is less than detection when obtaining line voltage distribution per unit value, EF can reduce, and when EF is less than 1, synchronous capacitor shows as inductor,
Absorb idle, to drag down line voltage distribution, and the with detection obtain line voltage distribution per unit value difference the big synchronous for exciter input value
It is faster that phase modifier absorbs idle speed.Conversely, EF can increase when exciter input value obtains line voltage distribution per unit value greater than detection
Greatly, when EF is greater than 1, synchronous capacitor shows as capacitor, issues inductive reactive power, thus compensated line voltage, and exciter
Input value and detection obtain line voltage distribution per unit value and differ bigger synchronous capacitor to issue idle speed faster.By to exciter
Input value, which carries out control, can accelerate synchronous capacitor to the absorption of reactive power and issue rate, and optimization is to grid-connected point failure electricity
The stabilization of pressure.
Step 4 repeats step 2-3, until Voltage Drop Failure elimination, closes synchronous capacitor, completes fault traversing.
As a preferred implementation manner, after failure terminates, synchronous capacitor does not immediately exit from operation, absorbs grid-connected
Point reactive power, drags down grid entry point overshoot voltage, when detection grid entry point alternating voltage restores to specified grid entry point alternating voltage mark
Value, and when setting is delayed interior stablize in the fluctuation range that specified grid entry point alternating voltage per unit value allows, determine failure
It eliminates, closes synchronous capacitor, the inhibition of grid entry point voltage overshoot after realizing to failure.As a kind of specific embodiment party
Formula, setting delay is 0.1s, sets the fluctuation range of permission as [0.95pu, 1.05pu], that is, when detection grid entry point alternating voltage
When restoring to specified 1pu, and being no longer than 1.05pu with 0.95pu is less than in 0.1s, it is latched synchronous capacitor, cut-off breaker
BRK。
Embodiment
In order to verify the validity of the present invention program, following emulation experiment is carried out.
Wind power plant is made of dual-feed asynchronous wind power generator and permanent magnet synchronous wind generator in the present embodiment, and total capacity is
Generation general power is 5MW, and grid entry point voltage rating is 20kV, and 1s breaks down, and 1.625s failure terminates.Synchronous phase modulation is not added
Machine is with addition synchronous capacitor and as shown in Figure 5 using grid entry point voltage-contrast figure after present invention control, it can be seen that grid-connected
Point Voltage Drop is more than 0.1pu, and synchronous capacitor after 0.05s is maintained to start, and to grid entry point output reactive power, is drawn high grid-connected
Near point voltage to rated value, after failure, synchronous capacitor closing immediately, and grid entry point is not in detection 0.1s
When again more than 1.05pu with being less than 0.95pu, it is just latched synchronous capacitor.It can be seen that synchronous capacitor is to grid-connected during failure
Point voltage, which is drawn high, to work well, and after failure, also has good inhibitory effect to the overshoot of grid entry point voltage.
Claims (5)
1. a kind of wind power plant fault traversing control method based on synchronous capacitor, which comprises the following steps:
Wind farm grid-connected ac voltage of step 1, real-time detection when determining to occur Voltage Drop failure, starts synchronous phase modulation
Machine；
Step 2 makees grid entry point alternating voltage per unit value and specified per unit value poor, and after difference clipping, progress PI control is obtained
Difference that treated；
Step 3, by treated, difference is added with voltagerating per unit value, obtains the input value of exciter in synchronous capacitor,
Exciter changes the output reactive power of synchronous capacitor by the change according to input value, draws high grid entry point voltage；
Step 4 repeats step 2-3, until Voltage Drop Failure elimination, closes synchronous capacitor, completes fault traversing.
2. the wind power plant fault traversing control method according to claim 1 based on synchronous capacitor, which is characterized in that step
In rapid 1, when grid entry point Voltage Drop is no more than setting discrimination threshold, determines that fuctuation within a narrow range occurs for wind power plant, do not influence wind-powered electricity generation
Normal safe and stable operation when grid entry point Voltage Drop is more than given threshold, and maintains setting to be delayed, judges that grid entry point is sent out
Raw failure, starts synchronous capacitor, the breaker BRK being closed between synchronous capacitor and grid entry point.
3. the wind power plant fault traversing control method according to claim 2 based on synchronous capacitor, which is characterized in that step
In rapid 1, discrimination threshold is set as 0.1pu, setting delay is 0.05s.
4. the wind power plant fault traversing control method according to claim 1 based on synchronous capacitor, which is characterized in that step
In rapid 4, restore when detecting grid entry point alternating voltage to specified grid entry point alternating voltage per unit value, and stablizes in setting is delayed
When in the fluctuation range that specified grid entry point alternating voltage per unit value allows, Failure elimination is determined, close synchronous capacitor, realization pair
The inhibition of grid entry point voltage overshoot after failure.
5. the wind power plant fault traversing control method according to claim 2 based on synchronous capacitor, which is characterized in that step
In rapid 4, setting delay is 0.1s, sets the fluctuation range of permission as [0.95pu, 1.05pu].
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113193587A (en) * | 2021-04-28 | 2021-07-30 | 国网经济技术研究院有限公司 | Sending-out cooperative control method and system for island double-fed wind power plant through high-voltage direct-current transmission |
| CN113985114A (en) * | 2021-11-25 | 2022-01-28 | 福州大学 | Power grid voltage drop detection method in low voltage ride through |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113193587A (en) * | 2021-04-28 | 2021-07-30 | 国网经济技术研究院有限公司 | Sending-out cooperative control method and system for island double-fed wind power plant through high-voltage direct-current transmission |
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| CN113985114A (en) * | 2021-11-25 | 2022-01-28 | 福州大学 | Power grid voltage drop detection method in low voltage ride through |
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Application publication date: 20181221 |