CN111490557A - Three-level 1140V wind power double-fed converter - Google Patents

Three-level 1140V wind power double-fed converter Download PDF

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Publication number
CN111490557A
CN111490557A CN202010237753.XA CN202010237753A CN111490557A CN 111490557 A CN111490557 A CN 111490557A CN 202010237753 A CN202010237753 A CN 202010237753A CN 111490557 A CN111490557 A CN 111490557A
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China
Prior art keywords
module
grid
power
igbt module
machine side
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Pending
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CN202010237753.XA
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Chinese (zh)
Inventor
林周泉
项峰
洪敏�
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Zhejiang Windey Co Ltd
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Zhejiang Windey Co Ltd
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Priority to CN202010237753.XA priority Critical patent/CN111490557A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/01—Arrangements for reducing harmonics or ripples
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
    • H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
    • H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/76—Power conversion electric or electronic aspects
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/40—Arrangements for reducing harmonics

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

The invention discloses a three-level 1140V wind power double-fed converter, which overcomes the problems of low generating efficiency and high electricity cost of a double-fed unit in the prior art, and comprises a transformer, a grid-connected cabinet module, a control cabinet module, a power cabinet module and a generator, wherein the output end of the transformer is connected with the input end of the grid-connected cabinet module, the output end of the grid-connected cabinet module is connected with the input end of the generator, the control end of the grid-connected cabinet module is connected with the input end of the power cabinet module, the power cabinet module is also connected with the control cabinet module, the output end of the generator is connected with the power cabinet module, and the rated. According to the invention, a 1140V three-level electric transmission technology is adopted to enable the output switch state combination of the frequency converter to be improved from 8 to 27, the output waveform of the converter is closer to a sine wave, the harmonic content is further reduced, the current is reduced by nearly 65% under the condition of the same unit power, the efficiency of an electric transmission system and a power transmission and transformation system is greatly improved, and the power consumption cost is reduced.

Description

Three-level 1140V wind power double-fed converter
Technical Field
The invention relates to the field of electric control systems of wind generating sets, in particular to a three-level 1140V wind power double-fed converter which can realize electric energy transmission with lower harmonic wave and higher voltage and can improve the generating capacity of the wind generating set with high converter efficiency.
Background
A wind power converter is an excitation device added on a rotor side in a double-fed wind power generator. The main function is that when the rotor speed n changes, the amplitude, phase, frequency and the like of excitation are controlled by the converter, so that the stator side can input constant frequency electricity to a power grid. At present, the outlet voltage of a land mainstream doubly-fed wind generating set is 690V, a main circuit of a converter adopts a two-level topological structure, and the converter of the two-level circuit has the characteristics that the main circuit structure is relatively simple and a control algorithm is easy to realize; but the defect is also obvious, the converter efficiency of the two-level circuit is relatively low, the maximum efficiency can only reach 96%, and the harmonic content of the output waveform is high.
For example, the invention discloses a "doubly-fed wind turbine system and a method for suppressing the rapid fluctuation of the grid voltage" in chinese patent document, which is published with the publication No. CN107196335A, a generator, a rotor-side converter, a grid-side inductor L g, a capacitor C, a phase-locked loop and a signal processor, wherein the generator converts wind power resources into electric power to be transmitted to the grid, the rotor-side converter controls the rotor excitation voltage of the generator, and forms a two-level PWM converter connected back-to-back through a dc link with the grid-side converter to realize variable-speed constant-frequency operation, the grid-side converter L g performs a filtering function, the phase-locked loop controls the doubly-fed wind turbine to track the phase of the grid and output required power by collecting the amplitude and phase of the grid voltage to a controller of the rotor-side converter and the grid-side converter.
Disclosure of Invention
The invention provides a three-level 1140V wind power double-fed converter for overcoming the problems of low power generation efficiency and high power cost of a double-fed unit in the prior art, wherein the circuit can output high level, low level and zero level, the output waveform is closer to sine wave, and electric energy transmission with lower harmonic wave and higher voltage can be realized, so that the output phase voltage of a fan frequency converter has three levels of-Vdc/2, 0 and + Vdc/2, the higher power generation efficiency is brought, the efficiency of the converter can be improved to 98%, and the generated energy of the unit is further improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a three level 1140V wind-powered electricity generation double-fed converter, includes the transformer, is incorporated into the power networks cabinet module, switch board module, power cabinet module and generator, the transformer output is connected with the cabinet module input that is incorporated into the power networks, and the cabinet module output that is incorporated into the power networks is connected with the generator input, and the cabinet module control end that is incorporated into the power networks is connected with power cabinet module input, and power cabinet module still is connected with the switch board module, and the generator output is connected with the power cabinet module, the generator stator rated output voltage of generator is 1140V, and the power cabinet module includes net side power module, machine side power module and direct current link, and net side power module and machine side power module are connected through.
The three-level 1140V electric transmission chain is applied to the technical field of double feeding, so that the output phase voltage of the fan frequency converter has three levels of-Vdc/2, 0 and + Vdc/2, higher power generation efficiency is brought, the efficiency of the converter can be improved to 98%, and the power generation capacity of a unit is further improved. By adopting a 1140V three-level electric transmission technology, the output switch state combination of the frequency converter of the double-fed fan is improved from 8 types to 27 types, the output waveform of the converter is closer to a sine wave, and the harmonic content is further reduced. Meanwhile, the three-level 1140V double-fed converter is adopted to increase the voltage of the fan from the traditional 690V to 1140V, the current is reduced by nearly 65% under the condition of the same unit power, the efficiency of an electric transmission system and a transmission and transformation system is greatly improved, and the power consumption cost is reduced. In addition, the scheme of the three-level converter can theoretically achieve 0 common-mode voltage, and fundamentally solves the problem that a motor bearing is corroded by the common-mode voltage.
Preferably, the grid-connected cabinet module comprises a main circuit breaker, a grid-connected contactor and a main contactor, wherein the input end of the main circuit breaker is connected with the output end of the transformer, the output end of the main circuit breaker is respectively connected with the input end of the grid-connected contactor and the input end of the main contactor, the output end of the grid-connected contactor is connected with the input end of the generator, and the output end of the main contactor is connected with the power cabinet module. The main breaker is connected to the 1140 primary side of the transformer.
Preferably, the control cabinet module comprises a converter interface system and a master control system, a control end of the master control system is connected with a controlled end of the converter interface system, and an output end of the converter interface system is connected with the power cabinet module. One end of the converter interface system is connected with the master control system, receives a control instruction of the master control system, and feeds back a real-time state signal of the double-fed converter to the master control system, the power cabinet module at the other end of the converter interface system completes driving and modulation of the power cabinet module, active power and reactive power of the unit are controlled, variable-speed constant-frequency power generation of the double-fed wind driven generator unit is realized, the master control system sends a control instruction of the power module to the converter interface system according to the actual operation condition of the unit, and receives a real-time state feedback signal of the double-fed converter.
Preferably, the power cabinet module further comprises an L C filter, a Chopper module, a machine side reactor and a Crowbar module, wherein the input end of the L C filter is connected with the grid-connected cabinet module, the other end of the L C filter is connected with the input end of the grid-side power module, the direct current side of the grid-side power module is respectively connected with the Chopper module and the machine side power module, the controlled end of the grid-side power module and the controlled end of the machine side power module are both connected with the output end of the converter interface system, the output end of the machine side power module is respectively connected with the output end of the generator and the Crowbar module, the direct current link comprises a neutral point O, the neutral point O is respectively connected with the grid-side power module and the machine side power module, one end of the grid-side power module is connected with the grid-side reactor, the other end of the grid-side power module is connected with the machine side power module, the grid-side power module can control the voltage of a direct current bus and adjust the power factor of the grid side, the reactive power module, the direct current generator is connected with the machine side reactor, the machine side power module mainly provides excitation current, the rotor winding of the rotor module, the generator side module is connected with the double-side generator, the direct-side power module, the direct-side generator, the direct-side power module is connected with the direct-side power module, the direct-side generator, the direct-side power module, the direct-side module.
Preferably, the L C filter comprises a grid-side reactor and a grid-side capacitor, one end of the grid-side reactor is respectively connected with the output end of the grid-connected cabinet module and the input end of the grid-side capacitor, the other end of the grid-side reactor is connected with the input end of the grid-side power module, the L C filter is arranged between the transformer and the grid-side power module, the grid-side reactor and the grid-side capacitor form a L C filter, the L C filter is arranged between the transformer and the grid-side power module and is used for absorbing high-frequency components and preventing switching noise of the converter from polluting.
Preferably, the grid-side power module includes a U1 phase bridge arm, a V1 phase bridge arm, and a W1 phase bridge arm, each phase bridge arm includes four grid-side IGBT modules and two clamp diodes, the clamp diodes are all connected to the dc link and the dc side of the machine-side power module, the U1 phase bridge arm includes a grid-side IGBT module a1, a grid-side IGBT module a2, a grid-side IGBT module B1, a grid-side IGBT module B2, a diode E1, and a diode E4, the V1 phase bridge arm includes a grid-side IGBT module A3, a grid-side IGBT module A4, a grid-side IGBT module B3, a grid-side IGBT module B4, a diode E2, and a diode E5, and the W1 phase bridge arm includes a grid-side IGBT module a5, a grid-side IGBT module A6, a grid-side IGBT module B5, a grid-side IGBT module B6, a diode E3, and a diode E6. And a freewheeling diode is reversely connected in parallel in the grid-side IGBT module.
Preferably, the machine side power module comprises a U2 phase bridge arm, a V2 phase bridge arm and a W2 phase bridge arm, each phase bridge arm comprises four machine side IGBT modules and two clamping diodes, the clamping diodes are all connected with the direct current sides of the direct current link and the machine side power module, the U2 phase bridge arm comprises a machine side IGBT module C1, a machine side IGBT module C2, a machine side IGBT module D1, a machine side IGBT module D2, a diode F1 and a diode F4, the V2 phase bridge arm comprises a machine side IGBT module C3, a machine side IGBT module C4, a machine side IGBT module D3, a machine side IGBT module D4, a diode F2 and a diode F5, and the W1 phase bridge arm comprises a machine side IGBT module C5, a machine side IGBT module C6, a machine side IGBT module D5, a machine side IGBT module D6, a diode F3 and a diode F6. A freewheeling diode is connected in parallel in reverse inside each machine side IGBT module.
Preferably, the dc link includes a capacitor CC1, a capacitor CC2, a dc Chopper module CP1 and a dc Chopper module CP2, one end of the capacitor CC1 is connected to the positive electrode of the dc link and one end of the dc Chopper module CP1, one end of the capacitor CC2 is connected to the negative electrode of the dc link and one end of the dc Chopper module CP2, and a neutral point O of the dc link is connected to the other end of the capacitor CC1, the other end of the dc Chopper module CP1, the other end of the capacitor CC2 and the other end of the dc Chopper module CP2, respectively.
Preferably, the grid-side IGBT module a1 and the grid-side IGBT module B2 in the U1-phase arm are main switches, and the grid-side IGBT module a2 and the grid-side IGBT module B1 are auxiliary switches. The whole topological structure has 24 IGBT modules, all the IGBT modules have the same requirements on voltage resistance, current and the like, and the bearing voltage is 1/2 of the direct-current side bus voltage. The network side power module U1 phase arm a1 and B2 are main switches, a2 and B1 are auxiliary switches, and by turning on (a 1, a 2), (a 2, B1), (B1, B2), the IGBT modules have 27 kinds of switching states in total. The output phase voltage of the U1 phase is + Vdc/2, 0, -Vdc/2. Similarly, the output phase voltages of the phases V1 and W1 of the grid-side power module and the machine-side power module are three levels of + Vdc/2, 0 and-Vdc/2.
Preferably, a neutral point O of the dc link is connected to a neutral point of each of the phase clamping diodes of the grid-side power module and the machine-side power module.
Therefore, the invention has the following beneficial effects:
1. the three-level 1140V electric transmission chain is applied to the technical field of double feeding, so that the output phase voltage of the fan frequency converter has three levels of-Vdc/2, 0 and + Vdc/2, higher power generation efficiency is brought, the efficiency of the converter can be improved to 98%, and the power generation capacity of a unit is further improved. By adopting a 1140V three-level electric transmission technology, the output switch state combination of the frequency converter of the double-fed fan is improved from 8 types to 27 types, the output waveform of the converter is closer to a sine wave, and the harmonic content is further reduced. Meanwhile, the three-level 1140V double-fed converter is adopted to increase the voltage of the fan from the traditional 690V to 1140V, the current is reduced by nearly 65% under the condition of the same unit power, the efficiency of an electric transmission system and a transmission and transformation system is greatly improved, and the power consumption cost is reduced. In addition, the scheme of the three-level converter can theoretically achieve 0 common-mode voltage, and fundamentally solves the problem that a motor bearing is corroded by the common-mode voltage;
2. the L C filter is arranged between the transformer and the network side power module and is used for absorbing high-frequency components and preventing the switching noise of the converter from polluting a power network;
3. one end of the converter interface system is connected with the master control system, receives a control instruction of the master control system and feeds back a real-time state signal of the double-fed converter to the master control system, the other end of the converter interface system is provided with a power cabinet module to drive and modulate the power cabinet module and control the active power and the reactive power of the unit, so that the variable-speed constant-frequency power generation of the double-fed wind driven generator unit is realized, and the master control system sends a control instruction of the power module to the converter interface system according to the actual operation condition of the unit and receives the real-time state feedback signal of the;
4. one end of the network side power module is connected with the network side reactor, the other end of the network side power module is connected with the machine side power module, and the network side power module can control the voltage of the direct current bus to be constant and adjust the power factor of the network side, so that the reactive power of the whole wind power generation system is adjusted more flexibly; one end of the machine side power module is connected with the grid side reactor, the other end of the machine side power module is connected with the machine side reactor, the machine side power module mainly provides generator exciting current, the current frequency of a rotor is controlled, and variable-speed constant-frequency power generation of the double-fed wind driven generator set is realized; the Chopper module is connected with a direct current bus between the network side power module and the machine side power module, and when the voltage of the direct current bus is abnormal, the Chopper module acts to control the direct current bus to be maintained in a normal range; one end of the machine side reactor is connected with the machine side power module, and the other end of the machine side reactor is connected with the generator rotor and the Crowbar module, so that the change rate of output voltage can be effectively reduced, the condition that the rotor bears peak voltage and du/dt electrical stress is improved, and the insulation life of the generator rotor is prolonged; the Crowbar module is connected with the machine side reactor and the generator rotor, and under the condition of sudden voltage drop of a power grid, the Crowbar module performs short circuit on a generator rotor winding, provides a bypass channel for rotor current, inhibits overcurrent at the rotor side and overvoltage of a direct-current bus, and realizes the protection effect on a unit; the common-mode voltage of 0 can be achieved, and the problem that the motor bearing is corroded by the common-mode voltage is solved fundamentally.
Drawings
Fig. 1 is an external structural view of the present invention.
Fig. 2 is a topological structure diagram of the present invention.
Fig. 3 is a block diagram of the main topology of the power module of the present invention.
In the figure, 1, a grid-connected cabinet module 11, a main circuit breaker 12, a grid-connected contactor 13, a main contactor 2, a control cabinet module 21, a converter interface system 22, a main control system 3, a power cabinet module 31, an L C filter 311, a grid-side reactor 312, a grid-side capacitor 32, a Chopper module 33, a grid-side power module 34, a machine-side power module 35, a machine-side reactor 36, a Crowbar module 37, a direct-current link 4, a transformer 5 and a generator.
Detailed Description
The invention is further described with reference to the following detailed description and accompanying drawings.
Example 1:
in the embodiment of the invention, as shown in fig. 1 and fig. 2, a three-level 1140V wind power double-fed converter comprises a grid-connected cabinet module, a control cabinet module and a power cabinet module which are connected in sequence, an internal topological structure comprises a grid-connected cabinet module, a control cabinet module, a power cabinet module, a transformer and a generator, an output end of the transformer is connected with an input end of the grid-connected cabinet module, an output end of the grid-connected cabinet module is connected with an input end of the power cabinet module, an output end of the power cabinet module is connected with the power cabinet module, a rated output voltage of a generator stator of the generator is 1140V, the grid-connected cabinet module comprises a main circuit breaker 11, a grid-connected contactor 12 and a main contactor 13, the control cabinet module comprises an interface converter system 21 and a main control system 22, the power cabinet module 3 further comprises an L C filter 31, a Chopper module 32, a machine side reactor 35, a Crowbar module 36, a grid-side power module 33, a machine side power module 34 and a link 37, an input end of the main circuit breaker 11 is connected with an output end of the transformer 4, an output end of the grid-connected with an input end of the main circuit breaker 2 and a controlled system 34, an output end of the grid-connected with an input end of the grid-connected with the grid-connected contactor 12C module, a side contactor module, a side converter module 34 of the controlled power cabinet module, a side module 34 of the controlled link module, a controlled link module 34 of the controlled power cabinet module 33, a controlled link module 34 is connected with a controlled link module 33, a controlled link module 33 of the controlled link 34 and a controlled link 34 of the controlled link 34, a controlled link module 33, a controlled link 34 of the controlled link 34, a controlled link 34 of the controlled link.
L C filter 31 includes net side reactor 311 and net side capacitor 312, net side reactor 311 one end is connected with the cabinet module 1 output end and net side capacitor 312 input end respectively, net side reactor 311 other end is connected with net side power module 33 input end, L C filter 31 is placed between transformer 4 and net side power module 33, net side reactor 311 and net side capacitor 312 constitute L C filter 31, place between transformer 4 and net side power module 33, for absorbing high frequency component, prevent the switching noise of converter from polluting the electric wire netting.
Example 2:
in this embodiment, as shown in fig. 3, a grid-side power module 33 is connected to a machine-side power module 34 through a dc link 37, the grid-side power module 33 is composed of three phase bridge arms, the machine-side power module 34 is also composed of three phase bridge arms, each phase bridge arm is composed of four IGBT modules and two clamping diodes, the dc link 37 is composed of two capacitors, a dc Chopper module CP1 and a dc Chopper module CP2, one end of the capacitor CC1 is connected to the positive electrode of the dc link 37 and one end of the dc Chopper module CP1, one end of the capacitor CC2 is connected to the negative electrode of the dc link 37 and one end of the dc Chopper module CP2, a neutral point O of the dc link 37 is connected to the other end of the capacitor CC1, the other end of the dc Chopper module CP1, the other end of the capacitor CC2 and the other end of the dc Chopper module CP2, and a neutral point O of the dc link 37 is connected to the clamping diodes of the grid-side power module 33 and the machine-side power module 34, and in addition, a freewheeling diode is connected in parallel in all the IGBT modules in an opposite direction.
The grid-side power module 33 comprises a U1 phase bridge arm, a V1 phase bridge arm and a W1 phase bridge arm, clamping diodes are connected with a direct-current link 37 and a direct-current side of the machine-side power module 33, the U1 phase bridge arm comprises a grid-side IGBT module A1, a grid-side IGBT module A2, a grid-side IGBT module B1, a grid-side IGBT module B2, a diode E1 and a diode E4, the V1 phase bridge arm comprises a grid-side IGBT module A3, a grid-side IGBT module A4, a grid-side IGBT module B3, a grid-side IGBT module B4, a diode E2 and a diode E5, and the W1 phase bridge arm comprises a grid-side IGBT module A5, a grid-side IGBT module A6, a grid-side IGBT module B5, a grid-side IGBT module B6, a diode E3 and a diode E6.
The power module 34 comprises a U2 phase bridge arm, a V2 phase bridge arm and a W2 phase bridge arm, each phase bridge arm comprises four machine side IGBT modules and two clamping diodes, the clamping diodes are connected with the direct current sides of the direct current link 37 and the machine side power module 33, the U2 phase bridge arm comprises a machine side IGBT module C1, a machine side IGBT module C2, a machine side IGBT module D1, a machine side IGBT module D2, a diode F1 and a diode F4, the V2 phase bridge arm comprises a machine side IGBT module C3, a machine side IGBT module C4, a machine side IGBT module D3, a machine side IGBT module D4, a diode F2 and a diode F5, and the W1 phase bridge arm comprises a machine side IGBT module C5, a machine side IGBT module C6, a machine side IGBT module D5, a machine side IGBT module D6, a diode F3 and a diode F6.
The grid side IGBT module A1 and the grid side IGBT module B2 in the U1 phase bridge arm are main switches, and the grid side IGBT module A2 and the grid side IGBT module B1 are auxiliary switches. The whole topological structure has 24 IGBT modules, all the IGBT modules have the same requirements on voltage resistance, current and the like, and the bearing voltage is 1/2 of the direct-current side bus voltage. The bridge arm A1 and B2 of the network side power module U1 are main switches, A2 and B1 are auxiliary switches, and the switching states of the IGBT modules are totally 27 by turning on (A1, A2), (A2, B1), (B1 and B2). The output phase voltage of the U1 phase is + Vdc/2, 0, -Vdc/2. Similarly, the output phase voltages of the phases V1 and W1 of the grid-side power module and the machine-side power module are three levels of + Vdc/2, 0 and-Vdc/2.
The method comprises the steps of applying a three-level 1140V electric transmission chain to the field of a double-fed technology, enabling a fan frequency converter to output phase voltage to have three levels of-Vdc/2, 0 and + Vdc/2, bringing higher power generation efficiency, enabling the efficiency of a converter to be improved to 98%, further improving the generating capacity of a unit, enabling the output switching state combination of the double-fed fan frequency converter to be improved from 8 to 27 by adopting a 1140V three-level electric transmission technology, enabling the output waveform of a converter to be closer to a sine wave, further reducing harmonic content, enabling a double-fed converter with three levels 1140V to improve the fan voltage to 1140V from 690V in the prior art, enabling the current to be reduced by approximately 65% under the condition of the same unit power, greatly improving the efficiency of an electric transmission system and a transmission system, reducing the power cost of a brown owowowowowwate, fundamentally solving the problem that a motor bearing is corroded by a common mode voltage, an L C filter is arranged between a transformer and a network side power module, is used for absorbing high frequency components, preventing switching noise of the converter from polluting a power grid, outputting a waveform closer to the sine wave, enabling the generator side of a machine side to be connected with a machine side of a high-voltage transmission machine side, enabling the machine side of a high-voltage, enabling the generator to be connected with a high-frequency converter, enabling the high-frequency generator, enabling the high-frequency converter to control module to control a high-frequency generator, and a high-frequency generator, enabling the high-frequency generator to control a high-frequency converter to receive a high-frequency converter, and a high-frequency converter, enabling the high-frequency converter to receive a high-frequency generator, and a high-frequency converter, enabling a high-frequency converter to receive a high-frequency converter, and a high-frequency converter, enabling a high-frequency converter to receive a high-frequency converter.
The above embodiments are described in detail for the purpose of further illustrating the present invention and should not be construed as limiting the scope of the present invention, and the skilled engineer can make insubstantial modifications and variations of the present invention based on the above disclosure.

Claims (10)

1. A three-level 1140V wind power double-fed converter comprises a transformer (4), it is characterized by also comprising a grid-connected cabinet module (1), a control cabinet module (2), a power cabinet module (3) and a generator (5), the output end of the transformer (4) is connected with the input end of the grid-connected cabinet module (1), the output end of the grid-connected cabinet module (1) is connected with the input end of a generator (5), the control end of the grid-connected cabinet module (1) is connected with the input end of a power cabinet module (3), the power cabinet module (3) is also connected with a control cabinet module (2), the output end of the generator (5) is connected with the power cabinet module (3), the rated output voltage of a generator stator of the generator (5) is 1140V, the power cabinet module (3) comprises a grid side power module (33), a machine side power module (34) and a direct current link (37), and the grid side power module (33) is connected with the machine side power module (34) through the direct current link (37).
2. A three-level 1140V wind power double-fed converter according to claim 1, characterized in that the grid-connected cabinet module (1) comprises a main circuit breaker (11), a grid-connected contactor (12) and a main contactor (13), wherein an input end of the main circuit breaker (11) is connected with an output end of the transformer (4), an output end of the main circuit breaker (2) is connected with an input end of the grid-connected contactor (12) and an input end of the main contactor (13), an output end of the grid-connected contactor (12) is connected with an input end of the generator (5), and an output end of the main contactor (13) is connected with the power cabinet module (3).
3. A three-level 1140V wind power doubly-fed converter according to claim 1, characterized in that said control cabinet module (2) comprises a converter interface system (21) and a master control system (22), wherein a control end of the master control system (22) is connected to a controlled end of the converter interface system (21), and an output end of the converter interface system (21) is connected to the power cabinet module (3).
4. A three-level 1140V wind power doubly-fed converter according to claim 1 or 3, wherein the power cabinet module (3) further comprises L C filter (31), Chopper module (32), machine side reactor (35) and Crowbar module (36), an input end of the L C filter (31) is connected to the grid-connected cabinet module (1), another end of the L C filter (31) is connected to an input end of the grid-side power module (33), a dc side of the grid-side power module (33) is connected to dc sides of the Chopper module (32) and the machine side power module (34), a controlled end of the grid-side power module (33) and a controlled end of the machine side power module (34) are connected to an output end of the converter interface system (21), an output end of the machine side power module (34) is connected to an output end of the generator (5) and the Crowbar module (36), and the neutral point O comprises a neutral point O connected to the grid-side power module (33) and the machine side power module (34), respectively.
5. A three-level 1140V wind power double-fed converter according to claim 4, characterized in that said L C filter (31) comprises a grid-side reactor (311) and a grid-side capacitor (312), one end of the grid-side reactor (311) is connected to the output of the grid-connected cabinet module (1) and the input of the grid-side capacitor (312), the other end of the grid-side reactor (311) is connected to the input of the grid-side power module (33), and the L C filter (31) is placed between the transformer (4) and the grid-side power module (33).
6. A three-level 1140V wind power doubly-fed converter according to claim 4, the grid-side power module (33) comprises a U1 phase bridge arm, a V1 phase bridge arm and a W1 phase bridge arm, each phase bridge arm comprises four grid-side IGBT modules and two clamping diodes, the clamping diodes are connected with a direct current link (37) and the direct current side of the machine side power module (33), the U1 phase bridge arm comprises a net side IGBT module A1, a net side IGBT module A2, a net side IGBT module B1, a net side IGBT module B2, a diode E1 and a diode E4, the V1 phase bridge arm comprises a net side IGBT module A3, a net side IGBT module A4, a net side IGBT module B3, a net side IGBT module B4, a diode E2 and a diode E5, the W1 phase arm comprises a net side IGBT module A5, a net side IGBT module A6, a net side IGBT module B5, a net side IGBT module B6, a diode E3 and a diode E6.
7. A three-level 1140V wind power double-fed converter according to claim 4, characterized in that the machine side power module (34) comprises a U2 phase leg, a V2 phase leg and a W2 phase leg, each phase leg comprises a four machine side IGBT module and two clamping diodes, the clamping diodes are connected with the DC link (37) and the DC side of the machine side power module (33), the U2 phase leg comprises a machine side IGBT module C1, a machine side IGBT module C2, a machine side IGBT module D1, a machine side IGBT module D2, a diode F1 and a diode F4, the V2 phase leg comprises a machine side IGBT module C3, a machine side IGBT module C4, a machine side IGBT module D3, a machine side IGBT module D4, a diode F2 and a diode F5, and the W1 phase leg comprises a machine side IGBT module C5, a machine side IGBT module 6, a machine side IGBT module D5, a machine side IGBT module D6, a diode F3 and a diode F6.
8. The three-level 1140V wind power double-fed converter according to claim 4, wherein the DC link (37) comprises a capacitor CC1, a capacitor CC2, a DC Chopper module CP1 and a DC Chopper module CP2, one end of the capacitor CC1 is connected with the positive electrode of the DC link (37) and one end of the DC Chopper module CP1, one end of the capacitor CC2 is connected with the negative electrode of the DC link (37) and one end of the DC Chopper module CP2, and the neutral point O of the DC link (37) is respectively connected with the other end of the capacitor CC1, the other end of the DC Chopper module CP1, the other end of the capacitor CC2 and the other end of the DC Chopper module CP 2.
9. The three-level 1140V wind power double-fed converter according to claim 6, wherein the U1 phase bridge arm medium grid side IGBT module A1 and the grid side IGBT module B2 are main switches, and the grid side IGBT module A2 and the grid side IGBT module B1 are auxiliary switches.
10. A three-level 1140V wind power doubly-fed converter according to claim 1, characterized in that the neutral point O of said dc link (37) is connected to the neutral points of the respective phase clamping diodes of the grid-side power module (33) and the machine-side power module (34), respectively.
CN202010237753.XA 2020-03-30 2020-03-30 Three-level 1140V wind power double-fed converter Pending CN111490557A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201025674Y (en) * 2007-02-07 2008-02-20 哈尔滨九洲电气股份有限公司 Three level middle voltage converter for MW wind power generation
CN201323527Y (en) * 2009-04-20 2009-10-07 天津瑞能电气有限公司 Double-fed frequency converter cabinet structure in wind generating set
CN108899938A (en) * 2018-09-06 2018-11-27 浙江运达风电股份有限公司 A kind of double-fed wind power generator group
CN211981513U (en) * 2020-03-30 2020-11-20 浙江运达风电股份有限公司 Three-level 1140V wind power double-fed converter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201025674Y (en) * 2007-02-07 2008-02-20 哈尔滨九洲电气股份有限公司 Three level middle voltage converter for MW wind power generation
CN201323527Y (en) * 2009-04-20 2009-10-07 天津瑞能电气有限公司 Double-fed frequency converter cabinet structure in wind generating set
CN108899938A (en) * 2018-09-06 2018-11-27 浙江运达风电股份有限公司 A kind of double-fed wind power generator group
CN211981513U (en) * 2020-03-30 2020-11-20 浙江运达风电股份有限公司 Three-level 1140V wind power double-fed converter

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