A kind of total power wind turbine generator
Technical field
The utility model relates to a kind of generating set, is specifically related to a kind of high pressure total power wind turbine generator.
Background technology
As shown in Figure 1, the total power wind turbine generator comprises transformer 11, current transformer 12, generator 14 and the blower fan 15 that connects successively, and wherein, current transformer 12 connects the stator of generator 14.In the MW class wind turbine group, generally adopt the middle volage current transformer of the middle piezoelectricity machine and the middle volage current transformer, particularly 690V electric pressure of 690V electric pressure to possess better economic at present.
Continuous development along with wind power generation, power of fan improves constantly, engine power presents the trend that improves constantly, continue to adopt the motor of 690V electric pressure and the middle pressure scheme of current transformer as the total power wind turbine generator, then the electric current on the lead between the electric current of transformer 11, current transformer 12, generator 14 and current transformer 12 and the generator 14 all can rise, and brings problems such as engineering design difficulty and the rapid rising of manufacturing cost.
The utility model content
The technical problems to be solved in the utility model is, a kind of total power wind turbine generator is provided, and overcomes the wind-driven generator unit difficult design that prior art exists, the defective that manufacturing cost sharply rises.
The technical scheme that its technical problem that solves the utility model adopts is: construct a kind of total power wind turbine generator, comprise the transformer, current transformer, generator and the blower fan that connect successively, it is characterized in that:
The secondary that described transformer is connected with described current transformer comprises at least two cover secondary windings, and every cover secondary winding comprises three three phase windings;
Described current transformer comprises three power cell chains, and the power cell quantity of each power cell chain equates with the secondary winding tricks of described transformer; The electric pressure of three phase windings of described transformer and the electric pressure of the power cell in the current transformer are complementary, corresponding one three phase winding that connects described transformer of described power cell input, the power cell output cascade of same described power cell chain, stator side, the other end that described power cell chain one end connects described generator connect same common reference point;
Described power cell is for transferring three-phase electricity to the circuit unit of single-phase electricity, and this circuit unit support electric energy by its single-phase effluent to its three-phase side.
In total power wind turbine generator of the present utility model, three three phase windings that respectively overlap winding of described transformer are three single-phase windings and are connected and form, and the method for attachment of described three phase windings is delta connection or is star connection.
In total power wind turbine generator of the present utility model, three three phase windings that respectively overlap winding of described transformer are three single-phase windings and are connected and form, and the method for attachment of described three phase windings comprises delta connection and star connection.
In total power wind turbine generator of the present utility model, the electric pressure of described generator is 3300V or 6600V or 10000V.
In total power wind turbine generator of the present utility model, described power cell comprises the controlled bridge of the three-phase that is coupled together by dc bus, bus capacitor and H type single-phase bridge.
In total power wind turbine generator of the present utility model, the controlled bridge of described three-phase is controlled bridge of two level three-phases or the controlled bridge of three level three-phases.
In total power wind turbine generator of the present utility model, described H type single-phase bridge is two level H type single-phase bridges or three level H type single-phase bridges.
Implement total power wind turbine generator of the present utility model, compared with the prior art, its beneficial effect is:
1. by adopting lower-cost multi winding transformer and current transformer cascade of power units, the electric pressure of generator is risen to high pressure grade (as 3300V, 6600V, 10000V etc.) by middle pressure grade, reduce each electric component in the wind-driven generator group system and connect the current class of lead, reach the purpose that reduces engineering design difficulty and overall manufacturing cost.
2. simple in structure, it is convenient to implement.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the basic composition schematic diagram of existing total power wind turbine generator.
Fig. 2 is that the utility model total power wind turbine generator constitutes and the annexation schematic diagram.
Fig. 3 is a kind of execution mode of current transformer power cell in the utility model total power wind turbine generator.
Fig. 4 is the another kind of execution mode of current transformer power cell in the utility model total power wind turbine generator.
Embodiment
As scheme shown in Figure 2ly, the utility model total power wind turbine generator comprises successively transformer 21, current transformer, generator 14 and the blower fan (not shown) that connects.
The secondary that transformer 21 is connected with current transformer comprises at least two cover secondary windings (present embodiment adopts three cover secondary windings), and every cover winding comprises three three phase windings.
Current transformer comprises three power cell chains, and the power cell quantity of each power cell chain equates with the secondary winding tricks of transformer 21.The electric pressure of three phase windings of transformer and the electric pressure of the power cell in the current transformer are complementary, corresponding one three phase winding that connects transformer 21 of the input of a power cell, the power cell output cascade of same power cell chain, stator side, the other end that power cell chain one end connects total power generator 14 connect same common reference point N.
Generator 14 can adopt the electric pressure higher than the current transformer power cell (as 3300V or 6600V or 10000V).
The power cell of current transformer adopts the circuit unit that three-phase electricity can be transferred to single-phase electricity, and this circuit unit support electric energy by its single-phase effluent to its three-phase side, include but not limited to the power cell of following structure:
1, as shown in Figure 3, power cell comprises the controlled bridge 221 of two level three-phases, bus capacitor 222 and the two level H type single-phase bridges 223 (also can adopt three level H type single-phase bridges) that coupled together by dc bus.
2, as shown in Figure 4, power cell comprises the controlled bridge 224 of three level three-phases, bus capacitor 222 and the three level H type single-phase bridges 225 (also can adopt two level H type single-phase bridges) that coupled together by dc bus.
The quantity of power cell is determined by the output voltage grade of gradation voltage generator and power cell in the power cell chain.
Three three phase windings that respectively overlap winding of transformer secondary winding are three single-phase windings and are connected and form, and the method for attachment of three phase windings can all be adopted delta connection or all adopt star connection or both adopted delta connection also to adopt star connection.When three phase windings of transformer secondary winding had both adopted delta connection also to adopt star connection, each overlaps can form certain phase shift angle between the winding, can further promote the performances such as electric current of transformer.