CN104578146A - Control method, device and system for island operation of wind generating set - Google Patents
Control method, device and system for island operation of wind generating set Download PDFInfo
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- CN104578146A CN104578146A CN201410791116.1A CN201410791116A CN104578146A CN 104578146 A CN104578146 A CN 104578146A CN 201410791116 A CN201410791116 A CN 201410791116A CN 104578146 A CN104578146 A CN 104578146A
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 239000013589 supplement Substances 0.000 claims description 6
- 238000005457 optimization Methods 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 2
- 238000011897 real-time detection Methods 0.000 claims 1
- 230000000087 stabilizing effect Effects 0.000 abstract 1
- 239000007858 starting material Substances 0.000 description 5
- 238000010248 power generation Methods 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 238000010977 unit operation Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process 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
- H02J3/38—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 invention provides a control method, a device and a system for island operation of a wind generating set, wherein the control method comprises the following steps: a low-voltage power supply is used for supplying power to a low-voltage power distribution system of the fan; starting a wind generating set to operate, and enabling an impeller to start to absorb wind energy and drive the rotating speed of a generator to continuously rise through variable pitch operation; starting a machine side converter when the rotating speed of the generator reaches the grid-connected rotating speed, and stabilizing the voltage of a direct current bus at a rated voltage; after the voltage of a direct current bus is stabilized, starting a grid-side converter, controlling the output current of the grid-side converter by the grid-side converter in a control mode of a grid-side voltage outer loop current inner loop, detecting the output power of a grid-side port, and feeding the output power back to a main controller; and the main controller performs real-time pitch variation according to the output power so as to maintain the output power at a target power. The control method, the device and the system for the island operation of the wind generating set can finish the live debugging of the wind generating set under the condition of no power grid.
Description
Technical field
The present invention relates to control method and the device of islet operation, particularly relate to a kind of control method of wind turbine generator islet operation, device and system.
Background technology
As shown in Figure 1, it is the structural representation of the grid-connected wind power unit operation system of prior art, and this system comprises impeller, gear box (direct-driving type non-gear box), generator, pusher side current transformer, DC bus, brake circuit, net side converter, grid-connected transformer, distribution transformer, blower fan low-voltage distribution system and master controller.Blower fan low-voltage distribution system obtains electric energy from net side, maintains unit blower fan low-voltage distribution system (becoming oar, driftage etc.) inner power consumption requirements.Wind-driven generator unit impeller absorbs wind energy and passes through gear box (direct-driving type non-gear box) by energy transferring to generator, changes mechanical energy is electric energy by generator, pusher side current transformer converts the three-phase alternating current that motor exports to direct current, and DC conversion is that the alternating current meeting grid-connected requirement is burst into electrical network by net side inverter.Generally, be responsible for stable DC busbar voltage by net side converter.Because the clamping action of bulk power grid voltage makes the alternating voltage of net side converter output port almost have nothing to do with load characteristic, namely net side ports voltage is almost invariable, and net side converter is in the control model that direct current pressure ring powers up stream ring; Pusher side current transformer controls the energy that generator sends master controller setting.Impeller adjusts by becoming oar regulating blade angle the size absorbing wind energy.Brake circuit is used for consuming the energy that DC bus is unnecessary under unusual service condition.The operation of grid-connected wind power unit needs to depend on electrical network as from the foregoing.
But, due to delayed some reasons such as grade of power grid construction, after causing many Construction of Wind Powers, need idle some months even a few year normally to generate electricity by way of merging two or more grid systems.During this section, wind turbine generator cannot complete the charged debugging of unit, wastes debug time, and unit is idle for a long time that many electric equipments also can be caused to damage or hydraulic performance decline.
Summary of the invention
The object of embodiments of the invention is to provide a kind of control method of wind turbine generator islet operation, device and system, and it without the charged debugging completing wind turbine generator under grid conditions, can save the debug time after powering on.
To achieve these goals, The embodiment provides a kind of control method of wind turbine generator islet operation, described wind turbine generator comprises: impeller, generator, pusher side current transformer, DC bus, net side converter, master controller, blower fan low-voltage distribution system, distribution transformer and low-tension supply, described low-tension supply accesses described distribution transformer low-pressure side, and described method comprises: utilize described low-tension supply to power to described blower fan low-voltage distribution system; Start described wind turbine generator to run, by becoming oar operation, making described impeller start to absorb wind energy, and driving described generator speed constantly to rise; Treat that described generator speed reaches grid-connected rotating speed, start described pusher side current transformer, and described DC bus-bar voltage is stabilized in rated voltage; After described DC bus-bar voltage is stable, start described net side converter, described net side converter adopts the output current of control model to described net side converter of voltage on line side outer shroud current inner loop to control, and the power output of checking network side ports, the power output of the net side ports detected is fed back to described master controller; Described master controller becomes oar in real time according to the power output of described net side ports makes the power output of described net side ports maintain target power.
Embodiments of the invention additionally provide a kind of control device of wind turbine generator islet operation, described wind turbine generator comprises: impeller, generator, pusher side current transformer, DC bus, net side converter, master controller, blower fan low-voltage distribution system, distribution transformer and low-tension supply, described low-tension supply accesses described distribution transformer low-pressure side, described control device comprises the first low-tension supply control module, startup optimization control module, pusher side current transformer control module, net side converter control module, wherein, described first low-tension supply control module, power to described blower fan low-voltage distribution system for controlling described low-tension supply, described startup optimization control module, running for starting described wind turbine generator, by becoming oar operation, making described impeller start to absorb wind energy, and driving described generator speed constantly to rise, described pusher side current transformer control module, for treating that described generator speed reaches grid-connected rotating speed, starts described pusher side current transformer, and controls described pusher side current transformer described DC bus-bar voltage is stabilized in rated voltage, described net side converter control module, for after described DC bus-bar voltage is stable, start described net side converter, described net side converter is made to adopt the output current of control model to described net side converter of voltage on line side outer shroud current inner loop to control, and the power output of checking network side ports, the power output of the net side ports detected is fed back to described master controller, described master controller becomes oar in real time according to the power output of described net side ports makes the power output of described net side ports maintain target power.
Embodiments of the invention additionally provide a kind of wind turbine generator islet operation system, comprising: wind turbine generator and control device as above.
The control method of the wind turbine generator islet operation that the embodiment of the present invention provides, device and system, power to blower fan low-voltage distribution system by utilizing low-tension supply, fan starting is run, and by the control to change oar part and converter part, wind turbine generator is made to realize islet operation, thus without the charged debugging completing wind turbine generator under grid conditions, the debug time after powering on can be saved.
Accompanying drawing explanation
Fig. 1 is the structural representation of the grid-connected wind power unit operation system of prior art;
Fig. 2 is the schematic flow sheet of the control method of the wind turbine generator islet operation of the embodiment of the present invention one;
Fig. 3 is the net side converter of the embodiment of the present invention one and the model schematic of equivalent load;
Fig. 4 is the structural representation of the control device of the wind turbine generator islet operation of the embodiment of the present invention two;
Fig. 5 is the structural representation of the wind turbine generator islet operation system of the embodiment of the present invention three;
The structural representation of wind turbine generator islet operation system that Fig. 6 is the low-tension supply of the embodiment of the present invention three when being uninterrupted power supply;
The structural representation of wind turbine generator islet operation system that Fig. 7 is the low-tension supply of the embodiment of the present invention three when being generator.
Embodiment
Below in conjunction with accompanying drawing, the control method of embodiment of the present invention wind turbine generator islet operation, device and system are described in detail.
Embodiment one
Fig. 2 is the schematic flow sheet of the control method of the wind turbine generator islet operation of the embodiment of the present invention one, Fig. 5 illustrates the structural representation of the wind turbine generator islet operation system of the embodiment of the present invention three, it comprises: the control device of wind turbine generator and wind turbine generator islet operation, the control device of wind turbine generator islet operation in this wind turbine generator islet operation system can run the method, with reference to Fig. 2 and Fig. 5, wind turbine generator comprises: impeller, generator, pusher side current transformer, DC bus, net side converter, master controller, blower fan low-voltage distribution system, distribution transformer and low-tension supply, low-tension supply access distribution transformer low-pressure side, the method comprises:
Step 11: utilize low-tension supply to power to blower fan low-voltage distribution system.Concrete, islet operation just means that wind turbine generator departs from electrical network, once lose the stability provided by bulk power grid, just likely there is sharp voltage unexpected in partial electric grid and/or frequency change, this powers with regard to needing low-tension supply to provide extra electric energy to carry out fan low-voltage distribution system, therefore low-tension supply can include, but not limited to uninterrupted power supply or generator.
Step 12: start wind turbine generator and run, by becoming oar operation, make impeller start to absorb wind energy, and drive electrical generators rotating speed constantly rises.Concrete, in step 11 low-tension supply to after blower fan low-voltage distribution system is powered, impeller just can absorb wind energy by change oar, thus drive electrical generators rotating speed constantly rises.Such as, when wind-force is larger, the blade angle of attack is reduced; Wind-force hour, makes the blade angle of attack increase.
Step 13: question generator rotating speed reaches grid-connected rotating speed, starter motor side converter, and DC bus-bar voltage is stabilized in rated voltage.Concrete, reach grid-connected rotating speed when generator speed constantly rises, now starter motor side converter, connect owing to there is no electrical network, net side converter cannot be received energy by net side draught and carry out the constant of stable DC side voltage, therefore just needs pusher side current transformer to complete the task of stable DC busbar voltage.
Further, in order to DC bus-bar voltage is stabilized in rated voltage, can comprise: detect DC bus-bar voltage in real time.When DC bus-bar voltage is lower than rated voltage, pusher side current transformer controls electric energy and flows to DC bus from wind-driven generator, and DC bus-bar voltage is raised; When DC bus-bar voltage is higher than rated voltage, pusher side current transformer controls electric energy and flows to wind-driven generator from DC bus, and DC bus-bar voltage is reduced.Being flow to DC bus from generator or flow to generator from DC bus by above-mentioned control electric energy, being stabilized near rated voltage through repeatedly regulating DC bus-bar voltage the most at last.
Step 14: after DC bus-bar voltage is stable, start net side converter, net side converter adopts the output current of control model to net side converter of voltage on line side outer shroud current inner loop to control, and the power output of checking network side ports, the power output of the net side ports detected is fed back to master controller.
Further, because electrical network does not connect, net side converter postrun net side ports voltage and load characteristic have much relations, here load can be the equivalent load that blower fan low-voltage distribution system and low-tension supply etc. are formed, or also can increase other extra equivalent load at grid-connected step down side.Fig. 3 is the net side converter of the embodiment of the present invention one and the model schematic of equivalent load.With reference to Fig. 3, blower fan low-voltage distribution system, low-tension supply and other extra equivalent load can be equivalent to a RLC load in parallel, RLC load forms an equiva lent impedance Z, net side converter energy control flow check is to the size of the electric current I of equivalent load, and electric current will at PLC impedance two ends coating-forming voltage U=I*Z through RLC load equivalent impedance Z.
In order to ensure that net side ports voltage stabilization is near nominal voltage, net side converter can adopt the output current of control model to net side converter of voltage on line side outer shroud current inner loop to control, and can comprise:
Net side converter real-time checking network side ports voltage, i.e. the voltage at RLC equivalent load two ends; When detecting that net side ports voltage is less than nominal voltage, net side converter increases output current set point, and detect actual output current, if actual output current is less than output current set point, net side converter will increase High-current output, if actual output current is greater than output current set point, net side converter will reduce electric current and export, and finally make actual output current equal with output current set point; When detecting that net side ports voltage is greater than nominal voltage, net side converter will reduce output current set point, and detect actual output current, if actual output current is less than output current set point, net side converter will increase High-current output, if actual output current is greater than output current set point, net side converter will reduce electric current and export, and finally make actual output current equal with output current set point.
Here, it should be noted that the increase of output current set point or reduce all can make to increase at equiva lent impedance Z two ends coating-forming voltage U or reduce, therefore, finally making net side ports voltage stabilization near nominal voltage through above-mentioned adjustment repeatedly.
Further, in order to the power output of checking network side ports, can comprise: Real-time Collection net side ports voltage and current, calculates net side ports power according to net side ports voltage and current.
Here it should be noted that, because net side converter power output and load have relation, therefore, the power output of the necessary constantly checking network side ports of net side converter, and the actual power value detected is fed back to master controller, the process for subsequent step provides data basis.
Step 15: master controller becomes oar in real time according to the power output of net side ports makes the power output of net side ports maintain target power.Concrete, after the power output of the net side ports detected is fed back to master controller by step 14, master controller just can adjust blade angle according to net side ports power in real time, thus makes the power output of net side ports maintain target power.
The control method of wind turbine generator islet operation of the present invention, power to blower fan low-voltage distribution system by utilizing low-tension supply, fan starting is run, and by the control to change oar part and converter part, wind power generation group is made to realize islet operation, thus without the charged debugging completing wind turbine generator under grid conditions, the debug time after powering on can be saved.
Further, wind turbine generator also comprises brake circuit, when the energy that impeller absorbs is greater than the power output of net side ports, direct voltage can be caused to raise, thus affect the normal operation of wind power generation group, fall after rise to make DC bus-bar voltage and reach energy re-balance, the method can also comprise:
When the wind energy that impeller absorbs is greater than the power output of net side ports, starts brake circuit and absorb unnecessary energy.
Further, in order to occur in the power output situation that the energy that impeller absorbs is less than net side ports, supplement the power loss of wind turbine generator each several part in short-term, the method can also comprise:
When the wind energy that impeller absorbs is less than the power output of net side ports, uses low-tension supply to supplement the power loss of wind turbine generator, maintain the normal operation of unit.
Embodiment two
As shown in Figure 4, it is the structural representation of the control device of the wind turbine generator islet operation of the embodiment of the present invention two, and it comprises: the first low-tension supply control module 21, powers to blower fan low-voltage distribution system for controlling low-tension supply; Startup optimization control module 22, running for starting wind turbine generator, by becoming oar operation, make impeller start to absorb wind energy, and drive electrical generators rotating speed constantly rising; Pusher side current transformer control module 23, reaches grid-connected rotating speed for question generator rotating speed, starter motor side converter, and DC bus-bar voltage is stabilized in rated voltage by controller side converter; Net side converter control module 24, for after DC bus-bar voltage is stable, start net side converter, net side converter is made to adopt the output current of control model to net side converter of voltage on line side outer shroud current inner loop to control, and the power output of checking network side ports, the power output of the net side ports detected is fed back to master controller; Master controller becomes oar in real time according to the power output of net side ports makes the power output of net side ports maintain target power.
The control device of wind turbine generator islet operation of the present invention, power to blower fan low-voltage distribution system by utilizing low-tension supply, fan starting is run, and by the control to change oar part and converter part, wind power generation group is made to realize islet operation, thus without the charged debugging completing wind turbine generator under grid conditions, the debug time after powering on can be saved.
Further, after impeller drive electrical generators rotates, generator is just equivalent to three-phase alternating-current supply, can by controlling the flow direction of electric energy, namely be flow to DC bus from generator or flow to generator from DC bus, finally make DC bus-bar voltage be stabilized near rated voltage through repeatedly regulating, pusher side current transformer control module 23 can comprise:
Pusher side current transformer start unit 231, reaches grid-connected rotating speed for question generator rotating speed, starter motor side converter;
DC bus-bar voltage detecting unit 232, for detecting DC bus-bar voltage in real time;
Power flow control unit 233, for when DC bus-bar voltage is lower than rated voltage, pusher side current transformer controls electric energy and flows to DC bus from wind-driven generator, and DC bus-bar voltage is raised; When DC bus-bar voltage is higher than rated voltage, pusher side current transformer controls electric energy and flows to wind-driven generator from DC bus, and DC bus-bar voltage is reduced.
Further, net side converter control module 24 can comprise:
Net side converter start unit 241, for after DC bus-bar voltage is stable, starts net side converter question generator rotating speed and reaches grid-connected rotating speed, starter motor side converter;
Net side ports voltage detection unit 242, for real-time checking network side ports voltage;
Output current control unit 243, for when detecting that net side ports voltage is less than nominal voltage, described net side converter increases output current set point, and detect actual output current, if actual output current is less than output current set point, described net side converter will increase High-current output, if actual output current is greater than output current set point, described net side converter will reduce electric current and export, and finally make actual output current equal with output current set point; When detecting that net side ports voltage is greater than nominal voltage, described net side converter will reduce output current set point, and detect actual output current, if actual output current is less than output current set point, described net side converter will increase High-current output, if actual output current is greater than output current set point, described net side converter will reduce electric current and export, and finally make actual output current equal with output current set point;
Power output detecting unit 244, for the power output of checking network side ports, feeds back to described master controller by the power output of the net side ports detected.
Concrete, net side converter control module 24 is controlled by the output current of control model to net side converter net side converter being run on voltage on line side outer shroud current inner loop, and the power output of checking network side ports, the power output of the net side ports detected is fed back to master controller simultaneously, make the power output of net side ports maintain target power so that master controller can become oar in real time according to the power output of net side ports, thus complete the charged debugging of wind turbine generator.
Further, power output detecting unit 244 can comprise:
Port voltage, current acquisition subelement 2441, for Real-time Collection net side ports voltage and current;
Net side ports power calculation subelement 2442, for calculating net side ports power according to described net side ports voltage and current.
Further, wind turbine generator also comprises brake circuit, and this control device can also comprise:
Brake circuit control module, for when the wind energy that described impeller absorbs is greater than the power output of described net side ports, starts described brake circuit to absorb unnecessary energy.
Concrete, when the energy that impeller absorbs is greater than the power output of net side ports, direct voltage can be caused to raise, thus affect the normal operation of wind power generation group, now startup brake circuit is absorbed the excess energy occurred in short-term by brake circuit control module.When energy re-balance, after DC bus-bar voltage falls after rise, it is out of service that brake circuit control module will control brake circuit.
Further, in order to occur in the power output situation that the energy that impeller absorbs is less than net side ports, supplement the power loss of wind turbine generator each several part in short-term, this control device can also comprise:
Second low-tension supply control module, for when the wind energy that described impeller absorbs is less than the power output of described net side ports, controls the power loss that described low-tension supply supplements wind turbine generator, maintains the normal operation of unit.
Further, in order to without under grid conditions, extra electric energy can be provided to come to the driftage of wind turbine generator inside, become the power electrical apparatus such as oar, master control, unsteady flow, cabin, and low-tension supply can comprise uninterrupted power supply or generator.
Embodiment three
As shown in Figure 5, it is the structural representation of the wind turbine generator islet operation system of the embodiment of the present invention three, it comprises: the control device of wind turbine generator and the wind turbine generator islet operation as described in embodiment two, wherein, wind turbine generator comprises: impeller, generator, pusher side current transformer, DC bus, net side converter, master controller, blower fan low-voltage distribution system, distribution transformer and low-tension supply, impeller, generator, pusher side current transformer, DC bus, net side converter, distribution transformer, blower fan low-voltage distribution system is connected successively, low-tension supply access distribution transformer low-pressure side, the two ends of master controller are connected with net side converter with impeller respectively.
The structural representation of wind turbine generator islet operation system when the low-tension supply that Fig. 6 shows the embodiment of the present invention three is uninterrupted power supply, the structural representation of wind turbine generator islet operation system when the low-tension supply that Fig. 7 shows the embodiment of the present invention three is generator, with reference to Fig. 6, there is provided the equipment of additional electrical energy can be uninterrupted power supply, uninterrupted power supply is connected to distribution transformer low-pressure side, in addition with reference to Fig. 7, there is provided the equipment of additional electrical energy can also be generator, adopt generator to provide during additional electrical energy just to need distribution transformer low-side switch to disconnect.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of described claim.
Claims (15)
1. the control method of a wind turbine generator islet operation, it is characterized in that, described wind turbine generator comprises: impeller, generator, pusher side current transformer, DC bus, net side converter, master controller, blower fan low-voltage distribution system, distribution transformer and low-tension supply, described low-tension supply accesses described distribution transformer low-pressure side, and described method comprises:
Described low-tension supply is utilized to power to described blower fan low-voltage distribution system;
Start described wind turbine generator to run, by becoming oar operation, making described impeller start to absorb wind energy, and driving described generator speed constantly to rise;
Treat that described generator speed reaches grid-connected rotating speed, start described pusher side current transformer, and described DC bus-bar voltage is stabilized in rated voltage;
After described DC bus-bar voltage is stable, start described net side converter, described net side converter adopts the output current of control model to described net side converter of voltage on line side outer shroud current inner loop to control, and the power output of checking network side ports, the power output of the net side ports detected is fed back to described master controller;
Described master controller becomes oar in real time according to the power output of described net side ports and maintains target power to make the power output of described net side ports.
2. control method according to claim 1, is characterized in that, the described process described DC bus-bar voltage being stabilized in rated voltage comprises:
Real-time detection DC bus-bar voltage;
When DC bus-bar voltage is lower than rated voltage, described pusher side current transformer controls electric energy and flows to DC bus from wind-driven generator, and DC bus-bar voltage is raised; When DC bus-bar voltage is higher than rated voltage, described pusher side current transformer controls electric energy and flows to wind-driven generator from DC bus, and DC bus-bar voltage is reduced.
3. control method according to claim 1, is characterized in that, the process that described net side converter adopts the output current of control model to net side converter of voltage on line side outer shroud current inner loop to control comprises:
Real-time checking network side ports voltage;
When detecting that net side ports voltage is less than nominal voltage, described net side converter increases output current set point, and detect actual output current, if actual output current is less than output current set point, described net side converter will increase High-current output, if actual output current is greater than output current set point, described net side converter will reduce electric current and export, and finally make actual output current equal with output current set point; When detecting that net side ports voltage is greater than nominal voltage, described net side converter will reduce output current set point, and detect actual output current, if actual output current is less than output current set point, described net side converter will increase High-current output, if actual output current is greater than output current set point, described net side converter will reduce electric current and export, and finally make actual output current equal with output current set point.
4. control method according to claim 1, is characterized in that, the process of the power output of described checking network side ports comprises:
Real-time Collection net side ports voltage and current;
Net side ports power is calculated according to described net side ports voltage and current.
5. control method according to claim 1, is characterized in that, described wind turbine generator also comprises brake circuit, and described method also comprises:
When the wind energy that described impeller absorbs is greater than the power output of described net side ports, start described brake circuit to absorb unnecessary energy.
6. control method according to claim 1, is characterized in that, described method also comprises:
When the wind energy that described impeller absorbs is less than the power output of described net side ports, use described low-tension supply to supplement the power loss of wind turbine generator, maintain the normal operation of unit.
7. control method according to claim 1, is characterized in that, described low-tension supply comprises uninterrupted power supply or generator.
8. the control device of a wind turbine generator islet operation, it is characterized in that, described wind turbine generator comprises: impeller, generator, pusher side current transformer, DC bus, net side converter, master controller, blower fan low-voltage distribution system, distribution transformer and low-tension supply, described low-tension supply accesses described distribution transformer low-pressure side, described control device comprises the first low-tension supply control module, startup optimization control module, pusher side current transformer control module, net side converter control module, wherein
Described first low-tension supply control module, powers to described blower fan low-voltage distribution system for controlling described low-tension supply;
Described startup optimization control module, running for starting described wind turbine generator, by becoming oar operation, making described impeller start to absorb wind energy, and driving described generator speed constantly to rise;
Described pusher side current transformer control module, for treating that described generator speed reaches grid-connected rotating speed, starts described pusher side current transformer, and controls described pusher side current transformer described DC bus-bar voltage is stabilized in rated voltage;
Described net side converter control module, for after described DC bus-bar voltage is stable, start described net side converter, described net side converter is made to adopt the output current of control model to described net side converter of voltage on line side outer shroud current inner loop to control, and the power output of checking network side ports, the power output of the net side ports detected is fed back to described master controller;
Described master controller becomes oar in real time according to the power output of described net side ports and maintains target power to make the power output of described net side ports.
9. control device according to claim 8, is characterized in that, described pusher side current transformer control module comprises:
Pusher side current transformer start unit, for treating that described generator speed reaches grid-connected rotating speed, starts described pusher side current transformer;
DC bus-bar voltage detecting unit, for detecting DC bus-bar voltage in real time;
Power flow control unit, for when DC bus-bar voltage is lower than rated voltage, described pusher side current transformer controls electric energy and flows to DC bus from wind-driven generator, and DC bus-bar voltage is raised; When DC bus-bar voltage is higher than rated voltage, described pusher side current transformer controls electric energy and flows to wind-driven generator from DC bus, and DC bus-bar voltage is reduced.
10. control device according to claim 8, is characterized in that, described net side converter control module comprises:
Net side converter start unit, for after described DC bus-bar voltage is stable, starts described net side converter;
Net side ports voltage detection unit, for real-time checking network side ports voltage;
Output current control unit, for when detecting that net side ports voltage is less than nominal voltage, described net side converter increases output current set point, and detect actual output current, if actual output current is less than output current set point, described net side converter will increase High-current output, if actual output current is greater than output current set point, described net side converter will reduce electric current and export, and finally make actual output current equal with output current set point; When detecting that net side ports voltage is greater than nominal voltage, described net side converter will reduce output current set point, and detect actual output current, if actual output current is less than output current set point, described net side converter will increase High-current output, if actual output current is greater than output current set point, described net side converter will reduce electric current and export, and finally make actual output current equal with output current set point;
Power output detecting unit, for the power output of checking network side ports, feeds back to described master controller by the power output of the net side ports detected.
11. control device according to claim 10, is characterized in that, described power output detecting unit comprises:
Port voltage, current acquisition subelement, for Real-time Collection net side ports voltage and current;
Net side ports power calculation subelement, for calculating net side ports power according to described net side ports voltage and current.
12. control device according to claim 8, it is characterized in that, described wind turbine generator also comprises brake circuit, described control device also comprises:
Brake circuit control module, for when the wind energy that described impeller absorbs is greater than the power output of described net side ports, starts described brake circuit to absorb unnecessary energy.
13. control device according to claim 8, is characterized in that, described control device also comprises:
Second low-tension supply control module, for when the wind energy that described impeller absorbs is less than the power output of described net side ports, controls the power loss that described low-tension supply supplements wind turbine generator, maintains the normal operation of unit.
14. control device according to claim 8, is characterized in that, described low-tension supply comprises uninterrupted power supply or generator.
The islet operation system of 15. 1 kinds of wind turbine generator, is characterized in that, described system comprises: wind turbine generator and the control device described in any one of claim 8-14.
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