CN106787803A - Full-power converter for wind generating set - Google Patents

Abstract

The invention provides a full-power converter for a wind turbine, which includes: a nacelle converter system located on the nacelle platform of the wind turbine and configured to convert low-frequency AC power generated by the wind turbine into DC power; a DC power transmission unit located within the tower of the wind turbine and configured to transmit DC power from the nacelle converter system to the tower bottom converter system; and the tower bottom converter system located on the tower bottom platform of the wind turbine. Configured to convert DC power into power frequency AC power that meets grid requirements.

Description

Full power converters for wind turbines

technical field

The invention relates to the field of wind power generation, and more particularly relates to a full power converter for a wind power generating set.

Background technique

With the intensification of the energy crisis, the development and utilization of new energy has become a research hotspot. A wind turbine is a power device that converts wind energy into mechanical energy, which drives the rotor of the generator to rotate, and finally outputs alternating current. Due to the unstable air volume of the wind turbine, the voltage of the low-frequency AC output is also unstable. Usually, the low-frequency AC energy output by the wind turbine is converted into DC power through rectification, and then the DC power is converted into AC mains power through an inverter circuit. , to ensure stable use.

The current wind turbines use centralized layout and integrated full power converters for energy transmission and conversion. The converter is located at the bottom of the tower of the wind power generating set as a whole, and adopts the AC-DC-AC form of back-to-back structure to transmit and convert electric energy. Such a converter module has a high degree of integration, and the entire converter system is located at the bottom of the wind turbine tower, with a large space ratio, concentrated equipment, and a small operation and maintenance space. AC form, which leads to a large number of cables used in the tower and large losses.

Contents of the invention

Aiming at one or more of the above problems, the present invention provides a new spatial arrangement structure of full power converters, which mainly separates the rectification unit and the inverter unit in space: the machine side rectification unit is located on the engine room platform, and the network The side inverter unit is located on the platform at the bottom of the tower, thereby optimizing the layout of the wind turbine as a whole, improving the problems of the current converter with bulky volume, centralized structure, and small space for module maintenance and replacement, and fundamentally changing the structure of the converter. form; and the DC form is used to transmit electric energy in the tower of the wind turbine, thereby reducing the energy loss of the line, reducing the cost of the unit cable, and simplifying the wiring process in the tower of the unit.

A full power converter for a wind power generating set according to an embodiment of the present invention includes: a nacelle converter system, located on a nacelle platform of the wind power generating set, configured to convert low-frequency AC power generated by the wind power generating set into DC power; The DC power transmission unit, located in the tower of the wind turbine, is configured to transmit DC power from the nacelle converter system to the tower bottom converter system; and the tower bottom converter system, located on the tower bottom platform of the wind turbine, is Configured to convert DC power into power frequency AC power that meets grid requirements.

In one embodiment, the engine room conversion system includes: a machine-side rectifying unit configured to convert low-frequency AC power into DC power by rectifying low-frequency AC power; and a machine-side filter unit configured to filter out the machine-side The harmonics generated by the IGBT high-frequency switch in the rectifier unit are used to avoid the impact of the harmonics generated by the IGBT high-frequency switch in the machine-side rectifier unit on the wind turbine.

In one embodiment, the machine-side filtering unit is a dU/dt filter.

In one embodiment, the DC power transmission unit includes: a DC power transmission loop configured to transmit DC power from the conversion system of the engine room to the conversion system at the bottom of the tower; and a transmission loop voltage stabilization unit configured to transmit DC power The circuit is stabilized.

In one embodiment, the DC power transmission circuit is a DC bus connection unit.

In one embodiment, the transmission loop voltage stabilizing unit is a DC bus stabilizing capacitor unit.

In one embodiment, the tower bottom conversion system includes: a grid-side inverter unit configured to convert DC power into power-frequency AC power; and a grid-side filter unit configured to filter out Harmonics generated by IGBT high-frequency switching to avoid the impact of harmonics generated by IGBT high-frequency switches in the grid-side inverter unit on the power grid.

In one embodiment, the grid-side filtering unit is an LCL filter.

In an embodiment, the full-function converter further includes: a transmission loop braking unit, located on the tower bottom platform, configured to absorb the DC power transmitted by the DC power transmission unit when the wind power generating set is in a low-voltage ride-through state.

In one embodiment, the full power converter further includes: a first programmable logic control unit of the converter, located on the platform at the bottom of the tower, configured to control the transmission loop braking unit and the grid side inverter unit; and the second The second programmable logic control unit of the converter is located on the platform of the engine room and is configured to control the rectifying unit on the machine side.

In one embodiment, the first converter programmable logic control unit and the second converter programmable logic control unit communicate through optical fibers.

In one embodiment, the DC power is ±600V DC power.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings required in the embodiments of the present invention. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For Those of ordinary skill in the art can also obtain other drawings based on these drawings without making creative efforts.

Figure 1 is a schematic diagram of the structure and location of a typical converter currently used in a wind turbine;

Figure 2 is a schematic diagram of the components of a full power converter currently used in wind turbines.

Fig. 3 is a schematic diagram of a full power converter for a wind power generating set according to an embodiment of the present invention.

Fig. 4 is a schematic diagram of electric energy flow in a full power converter for a wind power generating set according to an embodiment of the present invention.

Fig. 5 is a schematic diagram of a control system for a full power converter of a wind power generating set according to an embodiment of the present invention.

Explanation of reference signs: 200 full power converter, 210 machine-side filter unit, 220 rectifier unit, 221 machine-side control unit, 222 machine-side IGBT power core unit, 223 DC bus support capacitor unit, 230 DC bus and braking unit , 240 inverter unit, 241 grid side control unit, 242 grid side IGBT power core unit, 243 DC bus support capacitor unit, 250 grid side filter unit, 260 low frequency AC power transmission cable, 270 wind turbine, 280 grid.

300 full power converter, 310 engine room conversion system NCS, 311 machine side rectifier unit, 312 machine side filter unit, 320 DC power transmission unit, 321 DC power transmission circuit, 322 transmission circuit voltage stabilization unit, 330 tower bottom converter System TCS, 331 grid-side inverter unit (TCI), 332 grid-side filter unit, 340 transmission loop brake unit.

410 Cabin Converter System, 411 Machine Side Control Unit, 412 Machine Side IGBT Power Module Unit, 413 Machine Side Filter Unit, 420 DC Power Transmission Unit, 421 DC Power Transmission Circuit, 422 Transmission Circuit Voltage Stabilization Unit, 430 Tower Bottom Converter System, 431 grid side control unit, 432 grid side IGBT power module unit, 433 grid side filter unit, 440 transmission loop braking unit, 450 tower tube, 460 tower bottom platform, 470 engine room platform.

500 control system, 510 tower bottom control system, 511 grid side converter control unit, 512 transmission loop braking control unit, 513 grid side IGBT power module unit, 514 braking IGBT power module unit, 515 unit PLC, 520 engine room control system , 521 engine room inverter control unit, 522 machine side IGBT power module unit, 523 engine room control system.

detailed description

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Features and exemplary embodiments of various aspects of the invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by showing examples of the present invention. The present invention is by no means limited to any specific configurations and algorithms presented below, but covers any modification, substitution and improvement of elements, components and algorithms without departing from the spirit of the invention. In the drawings and the following description, well-known structures and techniques have not been shown in order to avoid unnecessarily obscuring the present invention.

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. In the drawings, the thicknesses of regions and layers may be exaggerated for clarity. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed descriptions will be omitted.

Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided in order to give a thorough understanding of embodiments of the invention. However, one skilled in the art will appreciate that the technical solutions of the present invention may be practiced without one or more of the specific details, or that other methods, components, materials, etc. may be employed. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring the main technical idea of the invention.

It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and embodiments.

Fig. 1 is a schematic diagram of the structure and location of a typical converter currently used in a wind power generating set. As shown in Fig. 1, the wind turbine adopts a centralized layout and an integrated full-power converter for energy transmission and conversion. The converter is located at the bottom of the tower of the wind power generating set as a whole, and adopts the AC-DC-AC form of back-to-back structure to transmit and convert electric energy. The converter uses IGBT (Insulated Gate Bipolar Transistor) as the main power element, and uses active rectification to convert electric energy.

The disadvantages of such a converter are: the degree of module integration is high, and the independent space of the module is small; the electric energy adopts the AC form during the internal transmission process of the wind turbine, which makes the number of cables used in the tower large and the loss is large; the whole set of converter The wind turbine system is located at the bottom of the tower of the wind turbine, with a large space ratio, concentrated equipment, and a small operation and maintenance space.

Figure 2 is a schematic diagram of the components of a full power converter currently used in wind turbines. As shown in FIG. 2 , the full power converter 200 includes: a machine-side filter unit 210 , a rectifier unit 220 , a DC bus and braking unit 230 , an inverter unit 240 and a grid-side filter unit 250 . The rectification unit 220 includes: a generator-side control unit 221 , a generator-side IGBT power core unit 222 , and a DC bus support capacitor unit 223 . The inverter unit 240 includes: a grid-side control unit 241 , a grid-side IGBT power core unit 242 , and a DC bus support capacitor unit 243 . From the wind generator 270 to the rectifier unit 220 of the full power converter 200 , electric energy is transmitted in the form of AC low frequency, that is, through the low frequency AC power transmission cable 260 . The transmission cable mainly uses multi-strand copper cables as the main dielectric material, and the cable installation layout is located in the unit tower. The low-frequency AC power generated by the wind power generator 270 is transformed into applicable AC power and supplied to the grid 280 after being converted by the full power converter 200 .

The topological form and composition structure of this typical full power converter 200 have the following shortcomings and deficiencies: the full power converter 200 adopts a centralized layout, although it can increase the compactness of the structure, but the overall volume is large and the space ratio is high, resulting in wind power The redundant space at the bottom of the generating set tower is small, and the modules are highly integrated, making maintenance difficult, small maintenance space, and prone to cascading damage; The DC bus support capacitor unit is deployed, so the number of DC bus support capacitors is large, the proportion in the power module unit is large, and it is easy to have adverse effects on the power unit; the topological form and composition structure of the full power converter 200 is adopted, and wind power generation The electric energy in the unit tower is transmitted in the form of low-frequency AC through multi-strand copper cables. The cable loss is large, the heat is large, the cost of materials is high, the wiring process is high, and the labor time is long.

With the gradual increase in the capacity of wind turbines in the future, the volume and capacity of full power converters will continue to increase and improve, and the design, planning and utilization of the space at the bottom of the tower will become more prominent and severe. The selection, cost, and lifespan of the transmission cables connected to the wind turbine will also become a factor restricting the development of the converter or even the whole machine.

The invention provides a new space configuration structure of the full-power converter, which changes the space layout of the traditional converter. The full power converter proposed by the present invention adopts an open layout to reduce the proportion of the converter in the tower bottom space of the wind power generating set, thereby optimizing the space configuration structure of the tower bottom of the generating set.

Fig. 3 is a schematic diagram of a full power converter for a wind power generating set according to an embodiment of the present invention. As shown in FIG. 3 , the full power converter 300 includes a nacelle converter system (NCS) 310 , a DC power transmission unit 320 and a tower converter system (TCS) 330 .

The nacelle converter system 310 is located on the nacelle platform of the wind power generating set, and is configured to convert the low-frequency AC power generated by the wind power generating set into DC power. The DC power transmission unit 320 is located in the tower of the wind power generating set, and is configured to transmit DC power from the nacelle conversion system 310 to the tower bottom conversion system 330 . The tower-bottom converter system 330 is located on the tower-bottom platform of the wind power generating set, and is configured to convert the DC power transmitted by the DC power transmission unit 320 into power-frequency AC power meeting the grid requirements.

The full power converter 300 adopts an open layout to reduce the proportion of the converter in the space at the bottom of the wind turbine tower, thereby optimizing the spatial configuration structure of the tower bottom of the unit, and improving the converter's current bulky, centralized structure, The problem of small space for module maintenance and replacement. In addition, the DC form is used to transmit electric energy in the tower of the wind power generating set, thereby reducing the energy loss of the line, reducing the use cost of the unit cable, and simplifying the wiring process in the tower of the unit.

In one embodiment, the cabin conversion system 310 includes a machine-side rectifying unit 311 and a machine-side filtering unit 312 . The generator-side rectifying unit 311 is configured to convert the low-frequency AC power into DC power by rectifying the low-frequency AC power generated by the wind power generating set. The generator-side filter unit 312 is configured to filter out the harmonics generated by the IGBT high-frequency switch in the generator-side rectifier unit 311 to prevent the harmonics generated by the IGBT high-frequency switch in the generator-side rectifier unit 311 from affecting the wind power generator. In one embodiment, the DC power may be ±600V DC power. In one embodiment, the machine-side filtering unit 312 may be a dU/dt (derivative of voltage with respect to time) filter.

In the full power converter 300 , the machine-side rectifying unit 311 and the machine-side filtering unit 312 of the converter are placed in the nacelle platform system, which increases the counterweight of the nacelle, thereby optimizing the overall layout of the wind power generating set.

In one embodiment, the DC power transmission unit 320 includes: a DC power transmission loop 321 and a transmission loop voltage stabilization unit 322 . The DC power transmission loop 321 is configured to transmit the DC power from the nacelle conversion system 310 to the tower bottom conversion system 330 . The transmission loop voltage stabilization unit 322 is configured to stabilize the DC power transmission loop 321 . In one embodiment, the DC power transmission loop 321 may be a ±600V DC bus connection unit (DC-link). In one embodiment, the transmission loop voltage stabilizing unit 322 may be a DC bus stabilizing capacitor unit, that is, a DC bus voltage supporting capacitor unit.

The full power converter 300 can centrally configure the voltage stabilizing unit of the transmission loop, separate the IGBT power unit and the voltage stabilizing unit, reduce their spatial correlation, and thus reduce the difficulty of maintaining the power module.

In one embodiment, the tower bottom converter system 330 includes: a grid-side inverter unit (TCI) 331 and a grid-side filter unit 332 . The grid-side inverter unit 331 is configured to convert the DC power transmitted by the DC power transmission unit 320 into power frequency AC power. The grid-side filtering unit 332 is configured to filter out the harmonics generated by the IGBT high-frequency switches in the grid-side inverter unit 331 to prevent the harmonics generated by the IGBT high-frequency switches in the grid-side inverter unit 331 from affecting the power grid. In one embodiment, the grid-side filtering unit 332 may be an LCL filter.

In one embodiment, the full power converter 300 further includes a transmission loop brake unit 340, which is located on the tower bottom platform of the wind turbine and is configured to absorb the DC power on the transmission unit when the wind turbine is in the low-voltage ride-through state. Transmitted DC power. For grid-connected wind turbines, when the grid voltage drops instantaneously, the power supply system requires the grid-connected wind turbines to remain connected to the grid for a specified time, instead of immediately protecting and shutting down, which is called low-voltage ride-through. In order to realize low-voltage ride-through, it is necessary to install a brake circuit in the converter to absorb energy that cannot be delivered during low-voltage ride-through.

The working principle of the full power converter 300 is as follows: the low-frequency AC power generated by the wind turbine is firstly rectified by the nacelle converter system 310 and converted into DC power of, for example, ±600V, which is transmitted through the DC power in the tower The unit 320 (for example, the DC bus connection unit) transmits to the tower bottom conversion system 330. In the tower bottom conversion system 330, the grid-side inverter unit 331 and the grid-side filter unit 332 convert the DC power into power that meets the requirements of the power grid. Frequency AC power (for example, 220V sinusoidal power).

Fig. 4 is a schematic diagram of electric energy flow in a full power converter for a wind power generating set according to an embodiment of the present invention. As shown in Figure 4, electrical energy is transferred from the generator to the grid in the direction of the arrow.

Firstly, the low-frequency AC power generated by the wind power generating set passes through the nacelle converter system 410 , and the nacelle converter system 410 is located on the nacelle platform 470 . The engine-room converter system 410 includes a machine-side control unit 411, a machine-side IGBT power module unit 412, and a machine-side filter unit 413, wherein the machine-side control unit 411 and the machine-side IGBT power module unit 412 are included in the machine-side rectifier unit in FIG. Unit 311. Through the machine-side control unit 411 and the machine-side IGBT power module unit 412, the low-frequency AC power generated by the wind power generating set is rectified and transformed into DC power. The machine-side filter unit 413 filters out the harmonics generated by the machine-side IGBT power module unit 412, so as to prevent the harmonics generated by the machine-side IGBT power module unit 412 from affecting the wind power generator set.

Then, the DC power is transmitted to the conversion system 430 at the bottom of the tower through the DC power transmission unit 420 , and the DC power transmission unit 420 is located in the tower 450 . Wherein, the DC power is transmitted through the DC power transmission circuit 421 . The transmission loop voltage stabilization unit 422 can stabilize the DC power transmission loop 421 .

Next, the tower bottom conversion system 430 located on the tower bottom platform 460 receives the DC power transmitted by the DC power transmission unit 420 and converts it into power frequency AC power meeting the grid requirements. The tower bottom converter system 430 includes a grid-side control unit 431, a grid-side IGBT power module unit 432, and a grid-side filter unit 433, wherein the grid-side control unit 431 and the grid-side IGBT power module unit 432 are included in the grid-side In the inverter unit 331. Through the grid-side control unit 431 and the grid-side IGBT power module unit 432, the DC power transmitted by the DC power transmission unit 420 is converted into power frequency AC power through inversion. The grid-side filtering unit 433 can filter out the harmonics generated by the grid-side IGBT power module unit 432, so as to prevent the harmonics generated by the grid-side IGBT power module unit 432 from affecting the power grid.

In addition, the transmission loop braking unit 440 located on the tower bottom platform 460 can absorb the DC power transmitted by the DC power transmission unit 420 when the wind power generating set is in the low-voltage ride-through state.

Fig. 5 is a schematic diagram of a control system for a full power converter of a wind power generating set according to an embodiment of the present invention. The control system 500 includes a tower bottom control system 510 and a nacelle control system 520 . The tower bottom control system 510 is located on the tower bottom platform, and includes a first converter programmable logic control (PLC) unit (converter PLC1#), and the converter PLC1# can control the grid side converter control unit 511 and the transmission circuit The braking control unit 512 , the grid-side converter control unit 511 and the transmission loop braking control unit 512 respectively control the grid-side inverter unit 331 and the transmission loop braking unit 340 in FIG. 3 . The nacelle control system 520 is located on the nacelle platform and includes a second PLC unit (converter PLC2#), the converter PLC2# can control the nacelle inverter control unit 521, and the nacelle inverter control unit 521 can control the machine side in Fig. 3 Rectification unit 311.

In one embodiment, the nacelle conversion control unit 521, the grid side conversion control unit 511 and the transmission loop braking control unit 512 are connected with the machine side IGBT power module unit 522, the grid side IGBT power module unit 513 and the braking IGBT power module unit 513 respectively. Module unit 514 is associated.

In one embodiment, the converter PLC1# and the converter PLC2# can communicate with each other, for example, communicate through optical fiber. In an embodiment, the nacelle conversion control unit 521 , the grid side conversion control unit 511 and the transmission loop braking control unit 512 may communicate with each other, for example, communicate through optical fibers.

In one embodiment, the tower bottom control system 510 also includes a unit PLC 515, and the unit PLC 515 can communicate with the ratio converter PLC1# and the converter PLC2# respectively. In one embodiment, the nacelle control system 520 may not have a separate converter PLC control unit (ie, converter PLC2#), but may realize the communication function with the unit PLC 515 by connecting the nacelle control system 523 . In the present invention, the communication bus type used between the unit PLC 515 and the converter PLC and each control unit can have various schemes.

To sum up, the full power converter according to the present invention changes the configuration structure of the traditional full power converter, and the rectifier unit, DC transmission unit, and inverter unit are installed and configured in a decentralized manner, reducing the overall cost of the converter system. The proportion of space is conducive to optimizing the layout of the unit, and is more conducive to the troubleshooting and analysis of the unit. At the same time, it is beneficial to the operation and maintenance of the unit in the later stage. At the same time, it increases the electrical distance between different units of the converter, effectively preventing the association of modules. permanent damage, save the maintenance cost of the unit, and will be of great benefit to the development of units with larger MW-level capacity in the future. According to the full power converter of the present invention, the voltage stabilizing unit of the transmission loop can be configured in a centralized manner, and the IGBT power unit and the voltage stabilizing unit can be separated to reduce the maintenance difficulty of the power module. For the power module unit of a traditional full-power converter, the weight of a single power module can reach 80KG-120KG, but with the full-power converter described in the present invention, the weight of a single power module can be reduced to 50%, under the same conditions The work efficiency can be improved by at least 30%, and the maintenance hours can be shortened by at least 50%. For large-capacity MW-level units, it is estimated that the annual power generation of a single unit can be increased by 1%-3%, which is conducive to improving the wind farm income. In addition, the full power converter according to the present invention uses direct current (for example, ±600VDC) to transmit electric energy in the tower, and only two sets of busbars are needed for cables of the same cross-sectional area and the same material as the alternating current transmission. It can save 80% of the cable material. Compared with the AC low-frequency power transmission form of the same voltage level, it can completely eliminate the influence of cable capacitive and inductive reactance, reduce cable loss, reduce the calorific value of the cable, and help improve the operating life of the unit .

It is to be understood that the invention is not limited to the specific arrangements and processes described above and shown in the drawings. For conciseness, detailed descriptions of known methods are omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present invention is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the sequence of steps after understanding the spirit of the present invention.

The functional blocks shown in the structural block diagrams described above may be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, it may be, for example, an electronic circuit, an application specific integrated circuit (ASIC), suitable firmware, a plug-in, a function card, or the like. When implemented in software, the elements of the invention are the programs or code segments employed to perform the required tasks. Programs or code segments can be stored in machine-readable media, or transmitted over transmission media or communication links by data signals carried in carrier waves. "Machine-readable medium" may include any medium that can store or transmit information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, radio frequency (RF) links, and the like. Code segments may be downloaded via a computer network such as the Internet, an Intranet, or the like.

The present invention may be embodied in other specific forms without departing from its spirit and essential characteristics. For example, the algorithms described in certain embodiments may be modified without departing from the basic spirit of the invention in terms of system architecture. Therefore, the present embodiments are to be considered in all respects as illustrative rather than restrictive, the scope of the present invention is defined by the appended claims rather than the above description, and, within the meaning and equivalents of the claims, All changes in scope are thereby embraced within the scope of the invention.

Claims (12)

1. a kind of full power convertor for wind power generating set, including：

Cabin converter system (310), positioned at the engineroom flat (470) of wind power generating set, is configured as the wind-power electricity generation The low-frequency ac electric energy that unit sends is converted to direct current energy；

Direct current energy transmission unit (320), in the tower (450) of the wind power generating set, being configured as will be described straight Stream electric energy is transferred to bottom of towe converter system (330) from the cabin converter system (310)；And

Bottom of towe converter system (330), positioned at the bottom of towe platform (460) of the wind power generating set, is configured as the direct current Electric energy is converted into meeting the industrial frequency AC electric energy of grid requirements.

2. full power convertor according to claim 1, wherein, the cabin converter system (310) includes：

Pusher side rectification unit (311), is configured to carry out rectification to the low-frequency ac electric energy, by the low frequency ac The direct current energy can be transformed to；And

Pusher side filter unit (312), is configured as filtering the IGBT HF switches (412) in the pusher side rectification unit (311) The harmonic wave of generation, with avoid the IGBT HF switches (412) in the pusher side rectification unit (311) from producing harmonic wave to the wind Power generator group produces influence.

3. full power convertor according to claim 2, wherein, the pusher side filter unit (312) is dU/dt filtering Device.

4. full power convertor according to claim 1, wherein, the direct current energy transmission unit (320) includes：

Direct current energy transmits loop (321), is configured as being transferred to the direct current energy from the cabin converter system (310) The bottom of towe converter system (330)；And

Transmission loop voltage regulation unit (322), is configured as carrying out voltage stabilizing to direct current energy transmission loop (321).

5. full power convertor according to claim 4, wherein, direct current energy transmission loop (321) is female direct current Line connection unit.

6. full power convertor according to claim 4, wherein, transmission loop voltage regulation unit (322) is female direct current Line electric capacity of voltage regulation unit.

7. full power convertor according to claim 1, wherein, the bottom of towe converter system (330) includes：

Net side inversion unit (331), is configured as the direct current energy being converted to the industrial frequency AC electric energy；And

Net side filter unit (332), is configured as filtering the IGBT HF switches (432) in the net side inversion unit (331) The harmonic wave of generation, is produced with the harmonic wave for avoiding the IGBT HF switches (432) in the net side inversion unit (331) from producing to power network Raw influence.

8. full power convertor according to claim 7, wherein, the net side filter unit (332) is LCL filter.

9. global function current transformer according to claim 1, also includes：

Transmission loop brake unit (340), positioned at the bottom of towe platform (460), is configured as at the wind power generating set The direct current energy transmitted on the direct current energy transmission unit (320) is absorbed when low-voltage crossing state.

10. the full power convertor according to any one of claim 2,7,9, also includes：

First current transformer programmable logic control unit, positioned at the bottom of towe platform (460), is configured as being transmitted back to described in control Road brake unit (340) and the net side inversion unit (331)；And

Second current transformer programmable logic control unit, positioned at the engineroom flat (470), is configured as controlling the pusher side whole Stream unit (311).

11. full power convertors according to claim 10, wherein, the first current transformer programmable logic control unit Communicated by optical fiber with the second current transformer programmable logic control unit.

12. full power convertors according to claim 1, wherein, the direct current energy is ± 600V direct current energies.