CN105932714B - Bi-motor wind-driven generator grid-connecting apparatus, wind-driven generator and grid-connected control method - Google Patents

Bi-motor wind-driven generator grid-connecting apparatus, wind-driven generator and grid-connected control method Download PDF

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Publication number
CN105932714B
CN105932714B CN201610431200.1A CN201610431200A CN105932714B CN 105932714 B CN105932714 B CN 105932714B CN 201610431200 A CN201610431200 A CN 201610431200A CN 105932714 B CN105932714 B CN 105932714B
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wind speed
generator
current transformer
grid
pusher side
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CN105932714A (en
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胡刚毅
左光群
张超
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Sany Renewable Energy Co Ltd
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Sany Heavy Energy Equipment Co Ltd
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    • H02J3/386
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/70Wind energy
    • Y02E10/76Power conversion electric or electronic aspects

Abstract

The invention discloses a kind of bi-motor wind-driven generator grid-connecting apparatus, wind-driven generator and grid-connected control methods, grid-connecting apparatus includes that the first pusher side switch, soft the second pusher side switch, asynchronous machine switch, the big current transformer of pusher side, the small current transformer of pusher side, net side current transformer, net side switch and the grid-connected switch of asynchronous machine, wind-driven generator include fan main body, synchronous generator and asynchronous generator and aforementioned grid-connecting apparatus;Grid-connected control method includes carrying out grid-connected, off-grid to synchronous generator and asynchronous generator according to wind speed to control.The present invention can realize that bi-motor or more motors share a grid-connecting apparatus, the grid-connected soft starter device for being used as asynchronous generator is realized by a part of structure of full power convertor, realize the big current transformer of pusher side and the small current transformer of pusher side, magneto alternator and asynchronous generator power distribution, it can be achieved without the grid-connected and switching undisturbed of impact, without additional soft lifting device and reactive power compensator, reduces cost, improves reliability.

Description

Bi-motor wind-driven generator grid-connecting apparatus, wind-driven generator and grid-connected control method
Technical field
The present invention relates to wind-driven generator, it is specifically related to a kind of bi-motor wind-driven generator grid-connecting apparatus, wind-power electricity generation Machine and grid-connected control method.
Background technology
With advanced manufacture, the development of computer technology, power electronic technique, wind power generating set is sent out towards high-power direction Exhibition, especially offshore wind farm uses the generating set of 5MW or more substantially.But with the increase of single-machine capacity, generator, speedup Design difficulty, manufacture difficulty and the cost of several critical components such as machine, current transformer will be substantially increased.To solve the above problems, state Inside and outside producer proposes that double-generator or multiple generator system, the technical solution of use are as follows one after another:It is sent out in a high-power blower Multiple small generators are installed, installation form is divided into motor group:
(1) one enters the gearbox having more, each output shaft one generator of band respectively;
(2) double armature hybrid excitation generator;
(3) rotor and stator of multigroup generator, or even the side using Multi-stage transmission are installed on the transmission shaft that wheel hub drives Case;
(4) there is also the schemes for installing a generator respectively in wind wheel both sides.
To sum up the purpose of scheme is for separate unit high-power generator, current transformer being split as more to reduce power etc. Grade reduces technical difficulty, manufacture difficulty and cost.Using the above scheme, although separate unit generator is split as more generators, It is required that every generator is equipped with a unsteady flow grid-connecting apparatus, price is still higher, system is not succinct enough, and different motors and off-grid Switching shock is difficult to eliminate.
Invention content
In view of this, the purpose of the present invention is to provide a kind of achievable bi-motors or more motors to share a grid-connected dress It sets, and can realize without grid-connected bi-motor wind-driven generator grid-connecting apparatus, wind-driven generator and the cutting-in control side with switching of impact Method.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is:
First, the present invention provides a kind of bi-motor wind-driven generator grid-connecting apparatus, including the first pusher side switch, the second pusher side Switch, soft switch of asynchronous machine, the big current transformer of pusher side, the small current transformer of pusher side, net side current transformer, net side switch and asynchronous machine Grid-connected switch, the input terminal of the big current transformer of pusher side pass through the synchronous generator of the first pusher side switch and bi-motor wind-driven generator Machine is connected, and the input terminal of the small current transformer of pusher side passes through the synchronous generator of the second pusher side switch and bi-motor wind-driven generator It is connected, and the input terminal of the small current transformer of the pusher side also passes through the asynchronous of soft of asynchronous machine switch and bi-motor wind-driven generator Generator is connected, and the input terminal of the big current transformer of the pusher side, the output end of the small current transformer of pusher side and net side current transformer is in parallel, described The output end of net side current transformer is switched by net side to be connected with the step-up transformer of power grid, the grid-connected switch concatenation of asynchronous machine Between the output end of asynchronous generator and the step-up transformer of power grid, the small unsteady flow of power ratio pusher side of the big current transformer of pusher side The power of device is big.
Secondly, the present invention provides a kind of wind-driven generator, including fan main body, synchronous generator and asynchronous generator, institute It states synchronous generator with asynchronous generator to be respectively connected with the output shaft of fan main body, the synchronous generator and asynchronous generator Output end be equipped with bi-motor wind-driven generator grid-connecting apparatus above-mentioned.
Again, the present invention also provides a kind of grid-connected control method of aforementioned bi-motor wind-driven generator, including it is following grid-connected The step of control:
1) when wind speed more than standby wind speed, less than incision wind speed V0, net side switch, startup net side current transformer progress are closed Net side Phase-Locked Synchronous, bi-motor wind-driven generator are in standby;
2) when wind speed reaches the incision wind speed V0 of setting, it is closed the first pusher side switch and the big current transformer of pusher side, will be synchronized Generator is connected to the grid;When wind speed is between the wind speed V1 for cutting wind speed V0, setting, become by the big current transformer of pusher side, net side The torque for flowing device control synchronous generator makes fan main body remain optimum tip-speed ratio and is captured with obtaining maximal wind-energy, when When wind speed is equal to wind speed V1, synchronous generator reaches rated power;
3) when wind speed wind speed V1, setting wind speed V2 between when, be closed the second pusher side switch, the small current transformer of pusher side, control Synchronous generator processed is in super generating state, and when wind speed is equal to wind speed V2, the output power of synchronous generator is equal to maximum limit Output power;
4) it when wind speed is equal to wind speed V2, disconnects the second pusher side switch, close the small current transformer of pusher side, keep the big unsteady flow of pusher side The power of device load is the rated power of synchronous generator so that the output power reduction of synchronous generator forces fan main body to add The rotor that speed belt moves asynchronous generator accelerates, and when the rotor speed of asynchronous generator is close to its synchronous rotational speed, is closed asynchronous electricity Soft of machine switch, starts the small current transformer of pusher side and controls asynchronous generator and start grid-connected, and setting time is kept to wait for asynchronous generator It is steady it is grid-connected after, be closed the grid-connected switch of asynchronous machine, disconnect soft of asynchronous machine and switch and stop the small current transformer of pusher side, will be asynchronous Generator is connected directly to the step-up transformer of power grid, and wind speed is equal to wind speed V3 at this time;
5) when wind speed wind speed V3, setting wind speed V4 between when, controlled by the big current transformer of pusher side, net side current transformer same Torque and the output power for walking generator, make synchronous generator be in rated power operation, while controlling entire fan main body Rotating speed, and then the revolutional slip and output power of asynchronous generator are controlled, extra power headroom is subjected to nothing by net side current transformer Work(is transformed to asynchronous generator and provides capacitive reactive power compensation;When wind speed is equal to wind speed V4, the output power of asynchronous generator is Its rated power;
6) when wind speed wind speed V4, setting rated wind speed V5 between when, synchronous generator, asynchronous generator are in volume Determine Power operation, when wind speed is more than rated wind speed V5, the power of the assembling unit is limited by pitch control fan main body.
Preferably, maximum limit the rated power that output power is the big current transformer of pusher side 1.1 times in the step 3), It is general at this time to be also not up to synchronous motor maximum firm power;Optionally using the slightly higher synchronous motor of rated power to carry High security.
Preferably, the step of being controlled the invention also includes following off-grids:
S1) when wind speed is more than rated wind speed V5, the power of the assembling unit is limited by pitch control fan main body;Work as wind Speed rated wind speed V5, setting wind speed V4 between when, synchronous generator, asynchronous generator are in rated power operation;
S2) when wind speed is equal to wind speed V4, the output power of asynchronous generator is its rated power;When wind speed is in wind speed V4, setting wind speed V3 between when, pass through the big current transformer of pusher side, net side current transformer control synchronous generator torque and output work Rate makes synchronous generator be in rated power operation, while controlling the rotating speed of entire fan main body, and then controls asynchronous generator Revolutional slip and output power, extra power headroom is subjected to the idle asynchronous generator that is transformed to by net side current transformer, appearance is provided Property reactive-load compensation;When wind speed is equal to wind speed V3, it is closed soft switch of asynchronous machine, starts the small current transformer of pusher side and disconnects asynchronous The grid-connected switch of motor carries out soft stop control using the small current transformer of pusher side to asynchronous machine;
S3) when wind speed wind speed V3, setting wind speed V2 between when, pass through the big current transformer of pusher side, net side current transformer control The torque of synchronous generator and output power make synchronous generator be in rated power operation, continue to control entire fan main body Rotating speed, and then control the revolutional slip and output power of asynchronous generator, carried out extra power headroom by net side current transformer The idle asynchronous generator that is transformed to provides capacitive reactive power compensation;When wind speed is equal to wind speed V2, soft switch of disconnection asynchronous machine, Stop the small current transformer of pusher side by asynchronous generator off-grid;
S4) when wind speed wind speed V2, setting wind speed V1 between when, be closed the second pusher side switch, the small current transformer of pusher side, control Synchronous generator processed is in super generating state, and when wind speed is equal to wind speed V2, the output power of synchronous generator is equal to maximum limit Output power;When wind speed is equal to wind speed V1, the output power of synchronous generator is equal to rated power;
S5) when wind speed wind speed V1, setting incision wind speed V0 between when, pass through the big current transformer of pusher side, net side current transformer The torque for controlling synchronous generator makes fan main body remain optimum tip-speed ratio to obtain maximal wind-energy capture, works as wind speed When equal to incision wind speed V0, the first pusher side switch and the big current transformer of pusher side are disconnected, by synchronous generator off-grid, bi-motor wind-force hair Motor is in standby.
Preferably, the step of the invention also includes following progress control mode selections:The variation of current wind speed is detected first Situation carries out cutting-in control if current wind speed increases according to current wind speed, if current wind speed is reduced, according to current Wind speed carries out off-grid control.
The bi-motor wind-driven generator grid-connecting apparatus tool of the present invention has the advantage that:
1, the present invention include the first pusher side switch, the second pusher side switch, soft switch of asynchronous machine, the big current transformer of pusher side, The small current transformer of pusher side, net side current transformer, net side switch and the grid-connected switch of asynchronous machine, can be equal and be considered as a total power unsteady flow Device, pusher side include the big current transformer of pusher side, the small current transformer of pusher side small one and large one two rectification/inverters, and net side is net side current transformer One whole rectification/inverter, the big current transformer of pusher side connect the small change of stator, pusher side of synchronous generator by the first pusher side switch Stream device connects the stator of asynchronous generator by soft switch of asynchronous machine;The small current transformer of pusher side is equipped in addition all the way second simultaneously Pusher side switch is connect with the stator of synchronous motor, forms the structure in parallel with the big current transformer of pusher side;While asynchronous generator Stator is connected to step-up transformer by the grid-connected switch of asynchronous machine, net side current transformer by net side switch directly with boosting transformation Device connects and then is connected into power grid, and bi-motor can be achieved in the present invention or more motors share a grid-connecting apparatus, pass through total power A part of structure of current transformer realizes the grid-connected starting device as asynchronous generator, realizes the big current transformer of pusher side and the small change of pusher side Device, synchronous generator and asynchronous generator power distribution are flowed, it can be achieved that without grid-connected and switching undisturbed is impacted, without additionally soft Lifting device and reactive power compensator reduce cost, improve reliability.
2, pusher side of the invention includes the big current transformer of pusher side, the small current transformer of pusher side totally two current transformers, the big current transformer of pusher side The small current transformer of power ratio pusher side power it is big, the big current transformer of pusher side is the relatively high power that matches of synchronous generator total power; And the small-power current transformer that the small current transformer of pusher side is soft of asynchronous generator, the power of the small current transformer of pusher side is only asynchronous generator The 1/4 to 1/3 of total power, while providing super generating power control for synchronous generator.
3, net side of the invention only includes one current transformer of net side current transformer, and there are five functions for tool:(I) as synchronous hair Motor total power is grid-connected and power regulation;(II) as soft of asynchronous generator driving and grid-connected;(III) it is used as entire wind-powered electricity generation The power regulation device of unit;(IV) as the super generating power conversion of synchronous generator;(V) as the idle benefit of asynchronous generator Repay device.
4, the present invention substantially may make up redundant system, when synchronous motor damages, can be closed soft of asynchronous machine and open It closes, the low wind speed small-power variable speed constant frequency generator of asynchronous generator is realized by the small current transformer of pusher side, net side current transformer;If by Two pusher sides switch, asynchronous generator capacity increase, and can also be achieved low wind speed variable speed constant frequency full power power generation in asynchronous generator, to the greatest extent Pipe increases more cost, but can actually achieve the purpose that improve reliability.
Description of the drawings
The attached drawing for constituting the part of the present invention is used to provide further understanding of the present invention, schematic reality of the invention Example and its explanation are applied for explaining the present invention, is not constituted improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is the structural schematic diagram of the embodiment of the present invention;
Fig. 2 is the course of work schematic diagram of the embodiment of the present invention;
Fig. 3 is the power curve schematic diagram of the embodiment of the present invention;
Reference sign:1, the first pusher side switchs;2, the second pusher side switchs;3, soft switch of asynchronous machine;4, pusher side Big current transformer;5, the small current transformer of pusher side;6, net side current transformer;7, net side switchs;8, the grid-connected switch of asynchronous machine;9, wind turbine master Body;91, synchronous generator;92, asynchronous generator;10, step-up transformer.
Specific implementation mode
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase Mutually combination.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.In the present invention, term " first ", " second " It is mainly used for distinguishing different components, but concrete restriction is not carried out to component.
As depicted in figs. 1 and 2, the bi-motor wind-driven generator grid-connecting apparatus of the present embodiment includes the first pusher side switch 1, the Two pusher side switches 2, soft switch 3 of asynchronous machine, the big current transformer 4 of pusher side, the small current transformer 5 of pusher side, net side current transformer 6, net side are opened Close 7 and the grid-connected switch 8 of asynchronous machine, the input terminal of the big current transformer of pusher side 4 passes through the first pusher side switch 1 and bi-motor wind-power electricity generation The magneto alternator 91 of machine is connected, and the input terminal of the small current transformer of pusher side 5 passes through the second pusher side switch 2 and bi-motor wind-force hair The magneto alternator 91 of motor is connected, and the input terminal of the small current transformer of pusher side 5 also by soft switch 3 of asynchronous machine and pair The asynchronous generator 92 of motor wind-driven generator is connected, and the output end and net side of the small current transformer of the big current transformer 4 of pusher side, pusher side 5 become The input terminal for flowing device 6 is in parallel, and the output end of net side current transformer 6 is connected by net side switch 7 with the step-up transformer 10 of power grid, different The grid-connected switch of step motor 8 is serially connected between the output end of asynchronous generator 92 and the step-up transformer 10 of power grid, the big unsteady flow of pusher side The power of the small current transformer of the power ratio pusher side of device 45 is big.In the present embodiment, the big current transformer 4 of pusher side, the small current transformer 5 of pusher side, net side Current transformer 6 is coupled by DC bus;First pusher side switch 1, the second pusher side switch 2, soft switch 3 of asynchronous machine, Net side switch 7 and the grid-connected switch 8 of asynchronous machine are the breaker or contactor for being suitable for wind power system;The big current transformer 4 of pusher side, machine The small current transformer 5 in side, net side current transformer 6 are to be suitable for the bi-directional electric power electronic converter of wind power system.
The contact capacity for the first pusher side switch 1 that the big current transformer 4 of pusher side of the present invention is connect with magneto alternator 91 with Power (namely rated power of the magneto alternator 91) matching of the big current transformer of pusher side 4, the small current transformer 5 of pusher side and permanent magnetism are same Soft of the asynchronous machine that the second pusher side switch 2, the small current transformer 5 of pusher side that step generator 91 connects are connect with asynchronous generator 92 is opened The contact capacity of pass 3 with small 5 power match of current transformer of pusher side, open by the net side that net side current transformer 6 is connect with step-up transformer 10 7 contact capacity and 6 power match of net side current transformer are closed, the asynchronous machine that asynchronous generator 92 is connect with step-up transformer 10 is simultaneously The contact capacity of net switch 8 is matched with the rated power of asynchronous generator 92.For example, if magneto alternator 91 it is specified Power is 2000kW, and the corresponding super generating value of maximum limitation output power is 10%, then big 4 and first pusher side of the current transformer switch of pusher side 1 capacity is 2000kVA, and the capacity of the small 5 and second pusher side switch 2 of current transformer of pusher side should be greater than 200kVA;If asynchronous The rated power of generator 92 is 2000kW, then soft pusher side small 5 and second pusher side switch 2 of current transformer, asynchronous machine switch 3 500kVA, which need to be only arranged, in capacity to meet the requirements, while the capacity of the grid-connected switch of asynchronous machine 8 is 2000kVA;Net side unsteady flow The capacity of device 6 and net side switch 7 is 2500kVA.
Wind-driven generator using the present embodiment bi-motor wind-driven generator grid-connecting apparatus includes that fan main body 9, permanent magnetism are same Generator 91 and asynchronous generator 92 are walked, rotor and the fan main body 9 of magneto alternator 91 are mechanically connected, asynchronous generator 92 rotor is mechanically connected with fan main body 9, and the output end of magneto alternator 91 and asynchronous generator 92 is equipped with this implementation Example bi-motor wind-driven generator grid-connecting apparatus above-mentioned.It is sent out using the wind-force of the present embodiment bi-motor wind-driven generator grid-connecting apparatus Motor is for 4MW Wind turbines, wherein magneto alternator 91 is specially 2MW permanent magnet synchronous motors, asynchronous generator 92 Specially 2MW squirrel cage induction motors, such as 3MW Wind turbines in addition, using 2MW permanent magnet synchronous motors and the cage type asynchronous electricity of 1MW The present embodiment bi-motor wind-force hair can be used in machine combination, 1.5MW magneto alternators and the combination of 1.5MW squirrel cage induction motors Motor grid-connecting apparatus;For another example 8MW Wind turbines are combined using two sets of the present embodiment bi-motor wind-driven generator grid-connecting apparatus It can simple realization.Unquestionably, the wind-driven generator of the present embodiment is not limited to magneto alternator 91 and asynchronous generating Machine 92 uses which kind of specific installation form and concrete type, is also not limited to magneto alternator 91 and asynchronous generator 92 quantity.
It is not difficult to find out, the wind-driven generator of the present embodiment or a redundant system:When permanent magnet synchronous motor 91 damages, It can be closed the grid-connected switch 8 of asynchronous machine, 92 low wind speed of asynchronous generator is realized by the small current transformer 5 of pusher side, net side current transformer 6 Small-power variable speed constant frequency generator;If soft the second pusher side switch 2, asynchronous machine 3 capacity of switch are increased to 2000kVA, also Low wind speed variable speed constant frequency full power power generation in asynchronous generator 92 can be achieved, although increasing more cost, can actually reach To the purpose for improving reliability.
The wind-driven generator of the present embodiment use completely new bi-motor wind-driven generator grid-connecting apparatus, realize asynchronous machine and The bi-motor generating set realization of permanent magnet synchronous motor composition is grid-connected without impacting, and provides corresponding grid-connected control method.Referring to Fig. 2, the grid-connected control method of the claim 2 bi-motor wind-driven generator of the present embodiment, includes the steps that following cutting-in controls:
1) when wind speed is more than standby wind speed, is less than incision wind speed V0, be closed net side switch 7, startup net side current transformer 6 into Row net side Phase-Locked Synchronous, bi-motor wind-driven generator are in standby;
2) when wind speed reaches the incision wind speed V0 of setting, it is closed the first pusher side switch 1 and the big current transformer 4 of pusher side, it will forever Magnetic-synchro generator 91 is connected to the grid;When wind speed wind speed V0, setting wind speed V1 between when, pass through the big current transformer 4 of pusher side, net Side current transformer 6 controls the torque of magneto alternator 91, and fan main body 9 is made to remain optimum tip-speed ratio to obtain maximum Wind energy captures, and when wind speed is equal to wind speed V1, magneto alternator 91 reaches rated power;
3) when wind speed wind speed V1, setting wind speed V2 between when, be closed the second pusher side switch 2, the small current transformer 5 of pusher side, Control magneto alternator 91 is in super generating state, when wind speed is equal to wind speed V2, the output work of magneto alternator 91 Rate is equal to maximum limitation output power;
4) it when wind speed is equal to wind speed V2, disconnects the second pusher side switch 2, close the small current transformer 5 of pusher side, keep the big change of pusher side Flow the rated power that the power that device 4 loads is magneto alternator 91 so that the output power of magneto alternator 91 subtracts Force less fan main body 9 accelerate drive asynchronous generator 92 rotor accelerate, when asynchronous generator 92 rotor speed close to its When synchronous rotational speed, be closed soft switch 3 of asynchronous machine, the small current transformer 5 of startup pusher side and control asynchronous generator 92 start it is grid-connected, It keeps setting time after asynchronous generator 92 is steadily grid-connected, is closed the grid-connected switch 8 of asynchronous machine, soft of asynchronous machine of disconnection is opened It closes 3 and stops the small current transformer 5 of pusher side, asynchronous generator 92 is connected directly to the step-up transformer 10 of power grid, at this time wind speed etc. In wind speed V3;
5) when wind speed wind speed V3, setting wind speed V4 between when, pass through the big current transformer 4 of pusher side, net side current transformer 6 control The torque of magneto alternator 91 and output power make magneto alternator 91 be in rated power operation, control simultaneously The rotating speed of entire fan main body 9, and then the revolutional slip and output power of asynchronous generator 92 are controlled, it will be more by net side current transformer 6 Remaining power headroom carries out the idle asynchronous generator 92 that is transformed to and provides capacitive reactive power compensation;It is different when wind speed is equal to wind speed V4 The output power for walking generator 92 is its rated power;
6) when wind speed wind speed V4, setting rated wind speed V5 between when, magneto alternator 91, asynchronous generator 92 It is in rated power operation, when wind speed is more than rated wind speed V5, the power of the assembling unit is carried out by pitch control fan main body 9 Limitation.
As shown in figure 3, wherein curve (1) is the gross output curve of wind power generating set, curve (2) is permanent-magnet synchronous The output power curve of generator 91, curve (3) are the output power curve of asynchronous generator 92;Region (a) is grid-connected wind Fast tracing area (regions c-max), the i.e. regions V0-V4, region (b) are the super generating region of magneto alternator 91, i.e. V1-V2 Region;Region (c) is the de- and web area of asynchronous generator 92, the i.e. regions V2-V3.
In the present embodiment, the maximum limitation output power in step 3) is the 1.1 of the rated power of the big current transformer of pusher side 4 Times, i.e., it is 10% in the super generating amount of super generating state, but be less than the maximum firm power of magneto alternator 91, alternatively even The slightly larger permanent magnet synchronous motor of rated power is selected to improve safety.
Further include the steps that following off-grids controls in the present embodiment referring to Fig. 2:
S1) when wind speed is more than rated wind speed V5, the power of the assembling unit is limited by pitch control fan main body 9;When Wind speed rated wind speed V5, setting wind speed V4 between when, magneto alternator 91, asynchronous generator 92 are in specified work( Rate is run;
S2) when wind speed is equal to wind speed V4, the output power of asynchronous generator 92 is its rated power;When wind speed is in wind speed V4, setting wind speed V3 between when, pass through the big current transformer 4 of pusher side, net side current transformer 6 control magneto alternator 91 torque And output power, so that magneto alternator 91 is in rated power operation, while controlling the rotating speed of entire fan main body 9, into And the revolutional slip and output power of asynchronous generator 92 are controlled, extra power headroom is subjected to idle change by net side current transformer 6 It is changed to asynchronous generator 92 and capacitive reactive power compensation is provided;When wind speed is equal to wind speed V3, it is closed soft switch 3 of asynchronous machine, opens The small current transformer 5 in motivation side simultaneously disconnects the grid-connected switch 8 of asynchronous machine, is carried out by the small control of current transformer 5 asynchronous generator 92 of pusher side soft Off-grid;
S3) when wind speed wind speed V3, setting wind speed V2 between when, pass through the big current transformer 4 of pusher side, net side current transformer 6 control The torque of magneto alternator 91 processed and output power make magneto alternator 91 be in rated power operation, continue to control The rotating speed of entire fan main body 9 is made, and then controls the revolutional slip and output power of asynchronous generator 92, it will by net side current transformer 6 Extra power headroom carries out the idle asynchronous generator 92 that is transformed to and provides capacitive reactive power compensation;When wind speed is equal to wind speed V2, It disconnects soft switch 3 of asynchronous machine, stop the small current transformer 5 of pusher side by 92 off-grid of asynchronous generator;
S4) when wind speed wind speed V2, setting wind speed V1 between when, be closed the second pusher side switch 2, the small current transformer 5 of pusher side, Control magneto alternator 91 is in super generating state, when wind speed is equal to wind speed V2, the output work of magneto alternator 91 Rate is equal to maximum limitation output power;When wind speed is equal to grid-connected wind speed V1, the output power of magneto alternator 91 is equal to Rated power;
S5) when wind speed wind speed V1, setting incision wind speed V0 between when, pass through the big current transformer 4 of pusher side, net side current transformer The torque of 6 control magneto alternators 91, makes fan main body 9 remain that optimum tip-speed ratio is caught to obtain maximal wind-energy It catches, when wind speed is equal to incision wind speed V0, the first pusher side switch 1 and the big current transformer 4 of pusher side is disconnected, by magneto alternator 91 Off-grid, bi-motor wind-driven generator are in standby.
In being exactly in when wind speed is between wind speed V1, wind speed V2 when wind speed, and middle wind speed is going out for wind power plant The larger wind speed region of existing probability.Pass through step 3) and S4 in the present embodiment) so that when magneto alternator 91 has shorter Interior super generating ability, it is therefore an objective to which the generated energy on the one hand being increased by abovementioned steps when wind speed improves the profit of wind energy With rate;On the other hand pass through step 4) and S3), preferably it can provide power stagnant ring for the grid-connected and off-grid of asynchronous generator 92 Section avoids the frequently grid-connected and off-grid of asynchronous generator 92.
In view of wind speed may not be that continue to increase or persistently reduce, therefore in the present embodiment, further include in actual environment The step of following progress control mode selections:The situation of change of current wind speed is detected first, if current wind speed increases, basis Current wind speed carries out cutting-in control, if current wind speed is reduced, off-grid control is carried out according to current wind speed, to realize to forever Both magnetic-synchro generator 91, asynchronous generator 92 are controlled according to auto-parallel, the off-grid of wind speed situation of change.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention With within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention god.

Claims (6)

1. a kind of bi-motor wind-driven generator grid-connecting apparatus, it is characterised in that:It is opened including the first pusher side switch (1), the second pusher side Close (2), asynchronous machine soft switch (3), the big current transformer of pusher side (4), the small current transformer of pusher side (5), net side current transformer (6), net side Switch (7) and the grid-connected switch (8) of asynchronous machine, the input terminal of the big current transformer of pusher side (4) by the first pusher side switch (1) and The synchronous generator (91) of bi-motor wind-driven generator is connected, and the input terminal of the small current transformer of pusher side (5) passes through the second pusher side Switch (2) is connected with the synchronous generator (91) of bi-motor wind-driven generator, and the input terminal of the small current transformer of the pusher side (5) is also It is connected with the asynchronous generator (92) of bi-motor wind-driven generator by soft switch (3) of asynchronous machine, the big unsteady flow of pusher side The input terminal of device (4), the output end of the small current transformer of pusher side (5) and net side current transformer (6) is in parallel, the net side current transformer (6) Output end is connected by net side switch (7) with the step-up transformer (10) of power grid, and the grid-connected switch (8) of asynchronous machine is serially connected in Between the output end of asynchronous generator (92) and the step-up transformer (10) of power grid, the power ratio of the big current transformer of pusher side (4) The power of the small current transformer of pusher side (5) is big.
2. a kind of wind-driven generator, including fan main body (9), synchronous generator (91) and asynchronous generator (92), the synchronization Generator (91) is connected with the output shaft of fan main body (9) respectively with asynchronous generator (92), it is characterised in that:The synchronous hair The output end of motor (91) and asynchronous generator (92) is equipped with bi-motor wind-driven generator grid-connecting apparatus described in claim 1.
3. the grid-connected control method of bi-motor wind-driven generator described in a kind of claim 2, which is characterized in that including following grid-connected The step of control:
1) when wind speed be more than standby wind speed, be less than incision wind speed V0 when, be closed net side switch (7), start net side current transformer (6) into Row net side Phase-Locked Synchronous, bi-motor wind-driven generator are in standby;
2) it when wind speed reaches the incision wind speed V0 of setting, is closed the first pusher side switch (1), starts the big current transformer of pusher side (4), it will Synchronous generator (91) is connected to the grid;When wind speed is between the wind speed V1 for cutting wind speed V0, setting, pass through the big current transformer of pusher side (4), net side current transformer (6) control synchronous generator (91) torque, make fan main body (9) remain optimum tip-speed ratio with It obtains maximal wind-energy to capture, when wind speed is equal to wind speed V1, synchronous generator (91) reaches rated power;
3) when wind speed wind speed V1, setting wind speed V2 between when, be closed the second pusher side switch (2), start the small current transformer of pusher side (5), control synchronous generator (91) is in super generating state, when wind speed is equal to wind speed V2, the output work of synchronous generator (91) Rate is equal to maximum limitation output power;
4) it when wind speed is equal to wind speed V2, disconnects the second pusher side switch (2), close the small current transformer of pusher side (5), keep the big change of pusher side Flow the rated power that the power that device (4) loads is synchronous generator (91) so that the output power of synchronous generator (91) is reduced The rotor that fan main body (9) accelerates to drive asynchronous generator (92) is forced to accelerate, when the rotor speed of asynchronous generator (92) connects When its nearly synchronous rotational speed, it is closed soft switch (3) of asynchronous machine, starts the small current transformer of pusher side (5) and controls asynchronous generator (92) beginning is grid-connected, keeps setting time after asynchronous generator (92) is steadily grid-connected, the grid-connected switch (8) of closure asynchronous machine, It disconnects soft switch (3) of asynchronous machine and stops the small current transformer of pusher side (5), asynchronous generator (92) is connected directly to power grid Step-up transformer (10), wind speed is equal to wind speed V3 at this time;
5) when wind speed wind speed V3, setting wind speed V4 between when, pass through the big current transformer of pusher side (4), net side current transformer (6) control The torque of synchronous generator (91) and output power make synchronous generator (91) be in rated power operation, while controlling entire The rotating speed of fan main body (9), and then the revolutional slip and output power of asynchronous generator (92) are controlled, it will by net side current transformer (6) Extra power headroom carries out the idle asynchronous generator (92) that is transformed to and provides capacitive reactive power compensation;When wind speed is equal to wind speed V4 When, the output power of asynchronous generator (92) is its rated power;
6) when wind speed wind speed V4, setting rated wind speed V5 between when, synchronous generator (91), asynchronous generator (92) are located The power of the assembling unit is limited by pitch control fan main body (9) when wind speed is more than rated wind speed V5 in rated power operation System.
4. the grid-connected control method of bi-motor wind-driven generator according to claim 3, which is characterized in that in the step 3) Maximum limitation output power be 1.1 times of rated power of the big current transformer of pusher side (4).
5. the grid-connected control method of bi-motor wind-driven generator according to claim 3, which is characterized in that further include following de- The step of network control:
S1) when wind speed is more than rated wind speed V5, the power of the assembling unit is limited by pitch control fan main body (9);Work as wind When speed is between rated wind speed V5, wind speed V4, synchronous generator (91), asynchronous generator (92) are in rated power operation;
S2) when wind speed is equal to wind speed V4, the output power of asynchronous generator (92) is its rated power;When wind speed is in wind speed When between V4, wind speed V3, the synchronous generator torque of (91) and defeated is controlled by the big current transformer of pusher side (4), net side current transformer (6) Go out power, so that synchronous generator (91) is in rated power operation, while controlling the rotating speed of entire fan main body (9), and then controls Extra power headroom is carried out idle change by the revolutional slip and output power of asynchronous generator (92) processed by net side current transformer (6) It is changed to asynchronous generator (92) and capacitive reactive power compensation is provided;When wind speed is equal to wind speed V3, it is closed soft switch of asynchronous machine (3), start the small current transformer of pusher side (5) and disconnect the grid-connected switch (8) of asynchronous machine, using the small current transformer of pusher side to asynchronous generating Machine (92) carries out soft stop control;
S3 it) when wind speed is between wind speed V3, wind speed V2, is synchronized by the big current transformer of pusher side (4), net side current transformer (6) control The torque of generator (91) and output power make synchronous generator (91) be in rated power operation, continue to control entire wind turbine The rotating speed of main body (9), and then the revolutional slip and output power of asynchronous generator (92) are controlled, it will be extra by net side current transformer (6) Power headroom carry out it is idle be transformed to asynchronous generator (92) provide capacitive reactive power compensation;When asynchronous generator (92), rotating speed connects When nearly synchronous rotational speed, disconnects soft switch (3) of asynchronous machine, closes the small current transformer of pusher side (5) by asynchronous generator (92) off-grid;
S4) when wind speed is between wind speed V2, wind speed V1, it is closed the second pusher side switch (2), the small current transformer of pusher side (5), control is same Step generator (91) is in super generating state, and when wind speed is equal to wind speed V2, the output power of synchronous generator (91) is equal to maximum Limit output power;When wind speed is equal to wind speed V1, the output power of synchronous generator (91) is equal to rated power;
S5) when wind speed wind speed V1, setting incision wind speed V0 between when, pass through the big current transformer of pusher side (4), net side current transformer (6) torque of control synchronous generator (91), makes fan main body (9) remain that optimum tip-speed ratio is caught to obtain maximal wind-energy It catches, when wind speed is equal to incision wind speed V0, the first pusher side switch (1) and the big current transformer of pusher side (4) is disconnected, by synchronous generator (91) off-grid, bi-motor wind-driven generator are in standby.
6. the grid-connected control method of bi-motor wind-driven generator according to claim 5, which is characterized in that further include it is following into The step of row control mode selects:The situation of change of current wind speed is detected first, if current wind speed increases, according to current wind Speed carries out cutting-in control, if current wind speed is reduced, off-grid control is carried out according to current wind speed.
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