CN109149641A - A kind of permanent-magnetic wind driven generator group realizes the device and control method of isolated operation - Google Patents
A kind of permanent-magnetic wind driven generator group realizes the device and control method of isolated operation Download PDFInfo
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- CN109149641A CN109149641A CN201811117953.0A CN201811117953A CN109149641A CN 109149641 A CN109149641 A CN 109149641A CN 201811117953 A CN201811117953 A CN 201811117953A CN 109149641 A CN109149641 A CN 109149641A
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000006837 decompression Effects 0.000 claims abstract description 23
- 239000003990 capacitor Substances 0.000 claims abstract description 9
- 230000002401 inhibitory effect Effects 0.000 claims abstract description 4
- 238000010248 power generation Methods 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 6
- 235000013399 edible fruits Nutrition 0.000 claims description 3
- 230000001052 transient effect Effects 0.000 claims description 3
- 230000003139 buffering effect Effects 0.000 claims 1
- 238000012423 maintenance Methods 0.000 abstract description 4
- 238000004146 energy storage Methods 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 230000005611 electricity Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000006378 damage Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000003068 static 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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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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Abstract
The present invention relates to the devices that a kind of permanent-magnetic wind driven generator group realizes isolated operation, DC bus-bar voltage is reduced to the DC voltage value of setting by its DC decompression unit, the DC voltage value of setting is converted to the alternating voltage of setting and exported to an input terminal of power supply switch unit by inversion unit, it is connected across between the positive and negative anodes of DC decompression unit output end after CHOPPER circuit and DC capacitor are in parallel, when DC bus-bar voltage is excessively high, it is then released energy by CHOPPER circuit, plays the role of inhibiting high voltage.The present invention increases a decompression and inversion circuit due to the DC side in current transformer, in isolated island, it is directly powered by this circuit to blower fan control system, so that the power component of AC-DC conversion can be reduced relative to UPS scheme, does not also need battery energy storage component.Maintenance free after operation, is greatly saved operating cost.The invention further relates to the control methods that a kind of permanent-magnetic wind driven generator group realizes the device of isolated operation.
Description
Technical field
The present invention relates to wind-powered electricity generation technical field of power generation more particularly to a kind of permanent-magnetic wind driven generator group to realize isolated operation
Device and control method.
Background technique
With the development of the world and China's economic, the consumption of the energy will be sharply increased.However it is opposite due to china natural resources
Destruction of deficient and non-renewable resources the consumption for environment, so that China will be faced with for a long time within following a period of time
The dual-pressure of environment and resource, the renewable energy developed including wind-force and solar power generation is China energy predicament
Best solution.
Be defined as follows in the world to isolated island: a local electric system or several local electric system are through commonly connected
Point is coupled, and with remaining electric system in a kind of operation of power networks state electrically separated.Its basic characteristics is voltage and frequency
Fluctuation range it is larger, influenced by load operation more obvious, majority operates in low pressure, low-frequency range.
Compared with electric system of networking, isolated island since various frequency modulation means limit and the control of reactive power compensating means are insufficient,
Static stability and dynamic stability are all poor, and active imbalance generally passes through long period generation adjustment when occurring could be extensive
The collapse of the multiple or even frequency of occurrences and collapse of voltage phenomenon.It, be to the characteristic of interacted system when original regional power grid is combined
It is comprehensively analyzed, solution is classified as isolated operation to anti-locking system in case of a fault, and after off-the-line, the power grid of active surplus will frequency
Rate increases, and causes high frequency to cut generator control unit movement, in the serious region of active vacancy, will cause collapse of frequency, cause
The power failure phenomenon of large area.
For marine or offshore wind farms, if the electrically connected interruption that all units are external, marine wind electric field etc.
It is same as a kind of state that can not be monitored, especially typhoon, under the inclement weather conditions such as heavy rain, unit be in runaway condition possibility prestige
Coerce the safety of entire wind farm device.Therefore it is most important to have an isolated operation function for offshore wind farm unit, on the one hand can be with
Real time inspection fan condition, another aspect Wind turbines are constantly under operating status, can to internal humidity and ambient condition
Effectively to be controlled.
Currently, Wind turbines isolated operation scheme general in industry has following two categories: first is that doubly-fed wind turbine machine
Group cannot continue to generate electricity since generator can not be grid-connected after grid cut-off, so can only be real using external diesel generating set
The control system operation and monitoring of existing blower, but runing time is limited by diesel oil capacity, and very consuming cost and
Pollute maritime environment.
Second is that the scheme of conventional type direct-drive permanent-magnetism Wind turbines, can use the ups power reality for having battery energy storage function
Blower starting after now having a power failure, self-generating charges to UPS after blower starting, realizes energy circulation with this.But this scheme requirement
The battery capacity of UPS should meet the service requirement of entire unit, and battery life is shorter, need periodic replacement battery, maintenance at
This height；And blower elder generation stoppage protection is needed after grid cut-off, and long-range control starting is then carried out by the power supply of UPS again, it cannot
Realize that blower operates normally smoothly switching between isolated operation both of which.
Summary of the invention
It is an object of the invention to overcome disadvantages described above, provide a kind of maintenance cost a kind of low stable permanent-magnet wind power
The device and control method of generating set realization isolated operation.
A kind of permanent-magnetic wind driven generator group of the invention realizes that the technical solution of the device of isolated operation is comprising unsteady flow
Device DC power supply bus, blower fan control system further include DC decompression unit, power supply switch unit, inversion unit, CHOPPER
Circuit, DC capacitor, the DC decompression unit are connected across between DC power supply bus, and DC bus-bar voltage is reduced to setting
DC voltage value, inversion unit by the DC voltage value of setting be converted to the alternating voltage of setting and exporting to power supply switch it is single
One input terminal of member, another input terminal of power supply switch unit are connected with power grid 400VAC/50HZ, power supply switch unit
Output is connected to blower fan control system, is connected across the output of DC decompression unit after the CHOPPER circuit and DC capacitor parallel connection
Between the positive and negative anodes at end, the DC capacitor is used to buffer the power transient imbalance of pusher side, net side, when DC bus-bar voltage mistake
Gao Shi is then released energy by the CHOPPER circuit, plays the role of inhibiting high voltage.
Preferably, the DC voltage value set is 500 volt to 800 volts, and the alternating voltage set is 400VAC/
50HZ。
Preferably, the inversion unit uses constant V/F control model, and output voltage remains 400VAC/
50HZ。
Preferably, the power supply switch unit include two IGBT modules in parallel, it is isolating transformer, power network switch, inverse
Become unit switch and output switch, the power network switch is arranged between power grid and IGBT module I, and the inversion unit switch is set
Set between inversion unit and IGBT module II, after IGBT module I, II parallel connection of IGBT module successively with isolating transformer and output
Switch series connection.
A kind of permanent-magnetic wind driven generator group of the invention realizes that the control method of the device of isolated operation is comprising following
Step:
The detection of step 1, network voltage, whether detection network voltage is lower than the 90% of voltage rating after blower starting, if
It is then to enter step 4, if it is not, then entering step 2；
Step 2 judges whether network voltage is less than the 110% of voltage rating, if it is not, then into high voltage crossing mode, such as
Fruit is then to enter step 3；
Step 3 judges whether inversion unit has been turned on, if do not started, enters normal power generation mode, if had been turned on,
DC decompression unit, inversion unit, power supply switch unit are then successively closed, subsequently into normal power generation mode；
Step 4 wears mode into low, starts the timing low-voltage duration, while successively starting DC decompression unit, inversion list
Member, power supply switch unit enter standby mode；
Step 5 judges the low-voltage duration whether more than two seconds, if it is not, then 2 are entered step, if it is, entering lonely
Island mode；
Step 6 is switched power supply to and is powered by inversion unit, is then turned off high-voltage switch gear；
Step 7, the output power for detecting inversion unit, judge whether its output power is consistent with motor side power, if it is not,
Then start current transformer pusher side power control, repeats step 7；If it is, into stable island operation state.
Preferably, the DC bus-bar voltage of current transformer is reduced to 500 volts to 800 by the DC decompression unit of the step 4
500 volts to 800 volts DC voltages are converted into the alternating voltage of 400VAC/50HZ by volt, inversion unit.
Preferably, the motor side power setting maximum upper limit of the step 7 is no more than the 6% of Wind turbines rated power.
The method have the benefit that since the DC side in current transformer increases a decompression and inversion circuit,
In the case of isolated island, directly powered by this circuit to blower fan control system, so that AC-DC can be reduced relative to UPS scheme
The power component of conversion does not need battery energy storage component yet.Maintenance free after operation, is greatly saved operating cost.Due to electricity
When net voltage U is less than the 90% of voltage rating, i.e., mode is worn into low, and start DC decompression unit, inversion unit, while electricity
Source switch unit enters standby mode, once the low-voltage duration is more than 2 seconds, then can switch to island mode with gapless.
Detailed description of the invention
Fig. 1 is the direct-drive permanent-magnetism Wind turbines isolated operation schematic diagram of background technique；
Fig. 2 is isolated operation of embodiment of the present invention schematic diagram of device；
Fig. 3 is isolated operation of embodiment of the present invention control method flow chart；
Fig. 4 is power supply of embodiment of the present invention switch unit schematic diagram.
Specific embodiment
The invention will be further described with reference to the accompanying drawings and embodiments.
Referring to attached drawing, a kind of permanent-magnetic wind driven generator group realizes that the technical solution of the device of isolated operation is comprising becomes
Flow device DC power supply bus 1, blower fan control system 2, further include DC decompression unit 3, power supply switch unit 4, inversion unit 5,
CHOPPER circuit 6, DC capacitor 7, the DC decompression unit 3 are connected across between DC power supply bus 1, by DC power supply mother
For 1 voltage drop of line as low as the DC voltage value of setting, the DC voltage value of setting is converted to the alternating voltage of setting by inversion unit 5
And export to an input terminal of power supply switch unit 4, the DC voltage value set is 500 volt to 800 volts, the setting
Alternating voltage be 400VAC/50HZ, the inversion unit 5 uses constant V/F control model, and output voltage remains
Another input terminal of 400VAC/50HZ, power supply switch unit 4 are connected with power grid 8, the output end connection of power supply switch unit 4
To blower fan control system 2,3 output end of DC decompression unit is connected across after 7 parallel connection of the CHOPPER circuit 6 and DC capacitor
Between positive and negative anodes, the DC capacitor 7 is used to buffer the power transient imbalance of pusher side, net side, when 1 voltage of DC power supply bus
It when excessively high, is then released energy by the CHOPPER circuit 6, plays the role of inhibiting high voltage, the power supply switch unit
4 include II 4-2 of I 4-1 of IGBT module and IGBT module in parallel, isolating transformer 4-3, power network switch 4-4, inversion unit switch
4-5 and output switch 4-6, the power network switch are arranged between I 4-1 of power grid 8 and IGBT module, the inversion unit switch 4-
5 are arranged between II 4-2 of inversion unit 5 and IGBT module, after I 4-1 of IGBT module, IGBT module II 4-2 are in parallel successively with every
From transformer 4-3 and output switch 4-6 series connection.
A kind of permanent-magnetic wind driven generator group of the invention realizes that the control method of the device of isolated operation is comprising following
Step:
The detection of step 1, network voltage, whether detection network voltage is lower than the 90% of voltage rating after blower starting, if
It is then to enter step 4, if it is not, then entering step 2；
Step 2 judges whether network voltage is less than the 110% of voltage rating, if it is not, then into high voltage crossing mode, such as
Fruit is then to enter step 3；
Step 3 judges whether inversion unit 5 has been turned on, if do not started, enters normal power generation mode, if had been turned on,
DC decompression unit 3, inversion unit 5, power supply switch unit 4 are then successively closed, subsequently into normal power generation mode；
Step 4 wears mode into low, starts the timing low-voltage duration, while successively starting DC decompression unit 3, inversion
Unit 5, power supply switch unit 4 enter standby mode, and the DC decompression unit 3 is by 1 voltage of DC power supply bus of current transformer
500 volts to 800 volts are reduced to, 500 volts to 800 volts DC voltages are converted into the alternating current of 400VAC/50HZ by inversion unit 5
Pressure；
Step 5 judges the low-voltage duration whether more than two seconds, if it is not, then 2 are entered step, if it is, entering lonely
Island mode；
Step 6 is switched power supply to and is powered by inversion unit 5, is then turned off high-voltage switch gear；
Step 7, the output power for detecting inversion unit 5, judge whether its output power is consistent with motor side power, if not
It is then to start current transformer pusher side power control, repeats step 7；If it is, into stable island operation state, the electricity
Pusher side power setting maximum upper limit is no more than the 6% of Wind turbines rated power.
Claims (8)
1. the device that a kind of permanent-magnetic wind driven generator group realizes isolated operation comprising current transformer DC power supply bus, blower control
System processed, which is characterized in that further include DC decompression unit, power supply switch unit, inversion unit, CHOPPER circuit, direct current
Hold, the DC decompression unit is connected across between DC power supply bus, and DC bus-bar voltage is reduced to the DC voltage of setting
Value, inversion unit by the DC voltage value of setting be converted to the alternating voltage of setting and export to one of power supply switch unit it is defeated
Enter end, another input terminal of power supply switch unit is connected with network voltage, and the output of power supply switch unit is connected to blower control
It is connected across between the positive and negative anodes of DC decompression unit output end after system processed, the CHOPPER circuit and DC capacitor are in parallel, institute
It is uneven to state power transient of the DC capacitor for buffering pusher side, net side, when DC bus-bar voltage is excessively high, then by described
CHOPPER circuit releases energy, and plays the role of inhibiting high voltage.
2. the device that a kind of permanent-magnetic wind driven generator group according to claim 1 realizes isolated operation, which is characterized in that institute
Stating network voltage is 400VAC/50HZ, and the DC voltage value set is 500 volt to 800 volts, the alternating voltage of the setting
For 400VAC/50HZ.
3. according to claim 1 or a kind of permanent-magnetic wind driven generator group as claimed in claim 2 realizes the device of isolated operation,
It is characterized in that, the inversion unit uses constant V/F control model, and output voltage remains 400VAC/50HZ.
4. according to claim 1 or a kind of permanent-magnetic wind driven generator group as claimed in claim 2 realizes the device of isolated operation,
It is characterized in that, the power supply switch unit includes two IGBT modules, isolating transformer, power network switch, inversion units in parallel
Switch and output switch, the power network switch are arranged between power grid and IGBT module I, and the inversion unit switch is arranged inverse
Become between unit and IGBT module II, after IGBT module I, II parallel connection of IGBT module successively with isolating transformer and output switch series
Connection.
5. the device that a kind of permanent-magnetic wind driven generator group according to claim 3 realizes isolated operation, which is characterized in that institute
Stating power supply switch unit includes that two IGBT modules in parallel, isolating transformer, power network switch, inversion unit switch and output are opened
It closes, the power network switch is arranged between power grid and IGBT module I, and the inversion unit switch is arranged in inversion unit and IGBT
Between module II, successively connect with isolating transformer and output switch after IGBT module I, II parallel connection of IGBT module.
6. the control method that a kind of permanent-magnetic wind driven generator group realizes the device of isolated operation, which is characterized in that it includes following
Step:
The detection of step 1, network voltage, whether detection network voltage is lower than the 90% of voltage rating after blower starting, if
It is then to enter step 4, if it is not, then entering step 2；
Step 2 judges whether network voltage is less than the 110% of voltage rating, if it is not, then into high voltage crossing mode, such as
Fruit is then to enter step 3；
Step 3 judges whether inversion unit has been turned on, if do not started, enters normal power generation mode, if had been turned on,
DC decompression unit, inversion unit, power supply switch unit are then successively closed, subsequently into normal power generation mode；
Step 4 wears mode into low, starts the timing low-voltage duration, while successively starting DC decompression unit, inversion list
Member, power supply switch unit enter standby mode；
Step 5 judges the low-voltage duration whether more than two seconds, if it is not, then 2 are entered step, if it is, entering lonely
Island mode；
Step 6 is switched power supply to and is powered by inversion unit, is then turned off high-voltage switch gear；
Step 7, the output power for detecting inversion unit, judge whether its output power is consistent with motor side power, if not
It is then to start current transformer pusher side power control, repeats step 7；If it is, into stable island operation state.
7. a kind of permanent-magnetic wind driven generator group according to claim 6 realizes the control method of the device of isolated operation,
It is characterized in that, the DC bus-bar voltage of current transformer is reduced to 500 volts to 800 volts by the DC decompression unit of the step 4, inversion
500 volts to 800 volts DC voltages are converted into the alternating voltage of 400VAC/50HZ by unit.
8. realizing the device of isolated operation according to claim 6 or a kind of permanent-magnetic wind driven generator group as claimed in claim 7
Control method, which is characterized in that the motor side power setting maximum upper limit of the step 7 is no more than Wind turbines rated power
6%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811117953.0A CN109149641A (en) | 2018-09-26 | 2018-09-26 | A kind of permanent-magnetic wind driven generator group realizes the device and control method of isolated operation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811117953.0A CN109149641A (en) | 2018-09-26 | 2018-09-26 | A kind of permanent-magnetic wind driven generator group realizes the device and control method of isolated operation |
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Family
ID=64823620
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| CN201811117953.0A Pending CN109149641A (en) | 2018-09-26 | 2018-09-26 | A kind of permanent-magnetic wind driven generator group realizes the device and control method of isolated operation |
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Cited By (2)
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| CN110350506A (en) * | 2019-07-23 | 2019-10-18 | 上海交通大学 | Direct current Wind turbines, middle straightening stream direct grid-connected system and Control and protection system |
| CN112761874A (en) * | 2021-02-04 | 2021-05-07 | 湘电风能有限公司 | Safe shutdown method and system and wind driven generator |
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| CN112761874A (en) * | 2021-02-04 | 2021-05-07 | 湘电风能有限公司 | Safe shutdown method and system and wind driven generator |
| CN112761874B (en) * | 2021-02-04 | 2022-09-16 | 湘电风能有限公司 | Safe shutdown method and system and wind driven generator |
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Application publication date: 20190104 |