CN109256794A - A kind of current transformer for synchronous wind generating system - Google Patents
A kind of current transformer for synchronous wind generating system Download PDFInfo
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- CN109256794A CN109256794A CN201710567986.4A CN201710567986A CN109256794A CN 109256794 A CN109256794 A CN 109256794A CN 201710567986 A CN201710567986 A CN 201710567986A CN 109256794 A CN109256794 A CN 109256794A
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- 230000001360 synchronised effect Effects 0.000 title claims abstract description 69
- 230000005284 excitation Effects 0.000 claims abstract description 34
- 230000005611 electricity Effects 0.000 claims description 23
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- 238000010248 power generation Methods 0.000 claims description 9
- 230000005389 magnetism Effects 0.000 claims 1
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Classifications
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- H02J3/386—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/14—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field
- H02P9/26—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field using discharge tubes or semiconductor devices
- H02P9/30—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field using discharge tubes or semiconductor devices using semiconductor devices
- H02P9/305—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field using discharge tubes or semiconductor devices using semiconductor devices controlling voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P2101/00—Special adaptation of control arrangements for generators
- H02P2101/15—Special adaptation of control arrangements for generators for wind-driven turbines
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P2103/00—Controlling arrangements characterised by the type of generator
- H02P2103/20—Controlling arrangements characterised by the type of generator of the synchronous type
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
Abstract
The present invention provides a kind of current transformer for synchronous wind generating system, comprising: acquisition unit, to acquire the real-time running data on three-phase synchronous generator；Control unit, the data to receive acquisition unit transmission generate at least current transformer triggering command；Three level block unit groups, to the triggering command sent according to control unit, the alternating current that three-phase synchronous generator is provided rectifies, export the alternating current of the first estate, it include at least one three level block unit with each three level block unit groups being connected in three-phase synchronous generator, three level block unit groups between phase and phase are connected in parallel, the unit cascaded connection of three level blocks that three level block unit groups include.Current transformer provided by the invention can satisfy the demand of the voltage of the even higher grade of 6KV, 10KV, improve the power of single machine.The present invention to the control of excitation and can also can be compatible with magneto alternator by simplifying circuit according to the realization of the design parameter of system.
Description
Technical field
The present invention relates to wind power generation fields, specifically, being related to a kind of current transformer for synchronous wind generating system.
Background technique
With the shortage of the energy, wind-power electricity generation is more and more paid attention to, since wind energy is a kind of clean renewable
Resource, and the amount of accumulateing is huge, therefore is increasingly increased by the specific gravity that the electric energy that wind-power electricity generation generates accounts for world's power generation total amount, wind-force hair
The technological improvement of electricity also just becomes the hot topic of research, wherein current transformer can have a direct impact the efficiency of wind-power electricity generation.Cause
This, current transformer is particularly important for wind generator system.
However, current transformer currently on the market can only meet the requirement of 3KV or less power grid substantially, it is not able to satisfy the current country
Higher, more mainstream voltage class (6KV, 10KV).
Summary of the invention
The purpose of the present invention is to provide a kind of current transformer for synchronous motor wind generator system, the current transformer packet
It includes:
Acquisition unit is connected on three-phase synchronous generator and power supply grid, to acquire the three-phase synchronous power generation
Real-time running data on machine and the voltage on line side on the power supply grid, current on line side；
Control unit is connect with the acquisition unit, the three-phase synchronous sent to receive the acquisition unit
The real-time running data of generator and the voltage on line side and the current on line side, and according to the real-time running data and institute
It states voltage on line side and current on line side generates at least current transformer triggering command；
Three level block unit groups are connected to the three-phase synchronous generator, described control unit, excitation winding and more
On winding transformer, to the triggering command sent according to described control unit, by the variation of the three-phase synchronous generator
Alternating current is controlled and is converted, and the alternating current of fixed frequency the first estate is exported after rectified and inversion；
Wherein, the three level blocks unit group being connect with each phase in the three-phase synchronous generator includes extremely
Few three level block units, each unit of modular unit group includes three-phase alternating current part and single phase ac part, three-phase
AC portion is connect with transformer, and single phase ac part is connect after cascading with synchronous motor.Single-phase portion is after cascade connection
It is connected in the threephase stator winding of generator；It particularly points out, for electrical excitation synchronous generator, there is a three special level
Power cell has been also connected to Energizing unit, and output is connected in the excitation winding of generator；
Multiwinding transformer is connect with the three level blocks unit group, to by the three level blocks unit group
The alternating current of described the first estate of output is converted to the alternating current of the second grade, and is output to the power supply grid side.
According to one embodiment of present invention, the three level blocks unit group between phase and phase in the following way into
Row connection:
Second ac input end of three level block units described in every phase first order is connected with each other.
According to one embodiment of present invention, the three level blocks unit that the three level blocks unit group includes it
Between carry out cascade connection in the following way:
First ac input end of three level block units described in previous stage is connected to three level block list described in rear stage
On second ac input end of member.
According to one embodiment of present invention, the three level blocks unit group and the multiwinding transformer are using as follows
Mode is attached:
The ac output end of each of three level block unit groups three level blocks unit described in every phase is all connected with
On the multiwinding transformer.
According to one embodiment of present invention, the three level blocks unit group and the three-phase synchronous generator are using such as
Under type is attached:
First ac input end of three level block units described in the afterbody of three level block unit groups described in every phase
It connects one to one with the three-phase alternating current output end of the three-phase synchronous generator.
According to one embodiment of present invention, described control unit is communicatively coupled with middle control platform, receives operator
Control instruction with determine whether send triggering command.
According to another aspect of the present invention, a kind of synchronous wind generating system is additionally provided, the system comprises:
Three-phase synchronous generator is used to generate electricity；
Any current transformer as described above.
According to one embodiment of present invention, the three-phase synchronous generator is magneto alternator.
According to one embodiment of present invention, the three-phase synchronous generator is excitation synchronous generator, wherein excitation list
Member includes:
Three level phase modules, by the three level block list of the first order in three level block unit groups described in the first phase
The first order direct current of the DC output end output of member is converted to second level alternating current；
Resonance circuit module shifts energy to generate resonance；
High frequency transformer module, the second level alternating current is converted to third level alternating current；
Uncontrollable rectifier module, the third level alternating current is converted into fourth stage direct current；
LC module is exported, to be filtered to output voltage；And
Copped wave module, can be released energy by copped wave access when DC voltage is excessively high.
According to one embodiment of present invention, described control unit is sent described in triggering command to Energizing unit triggering
Energizing unit.
Present invention be advantageous in that current transformer provided by the invention can be adapted for the even higher grade of 6KV, 10KV
Voltage demand, improve the power of single machine.Also, the present invention also provides a kind of excitation con-trol solution, Ke Yigen
The control to excitation is realized according to the design parameter of system.Also, the present invention can also be compatible with permanent-magnet synchronous by simplifying circuit
Motor.
Other features and advantages of the present invention will be illustrated in the following description, also, partly becomes from specification
It obtains it is clear that understand through the implementation of the invention.The objectives and other advantages of the invention can be by specification, right
Specifically noted structure is achieved and obtained in claim and attached drawing.
Detailed description of the invention
Attached drawing is used to provide further understanding of the present invention, and constitutes part of specification, with reality of the invention
It applies example and is used together to explain the present invention, be not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the structural block diagram using the synchronous wind generating system of converter topologies in the prior art；
Fig. 2 is using the synchronization according to an embodiment of the invention for realizing current transformer with three level block unit groups
The structural block diagram of wind generator system；
Fig. 3 shows the block diagram of the inside joint detail of three level block unit groups in current transformer shown in Fig. 2；
Fig. 4 shows d, q axis equivalent circuit diagram of a kind of excitation synchronous generator in the prior art；
Fig. 5 is the output 6KV voltage gradation realized with three level block unit groups according to one embodiment of the present of invention
Synchronous wind generating system structural block diagram；
Fig. 6 is the output 10KV voltage gradation realized with three level block unit groups according to one embodiment of the present of invention
Synchronous wind generating system structural block diagram；
Fig. 7 is that the circuit of the three level block unit of diode clamp according to employed in one embodiment of the present of invention is former
Reason figure；
Fig. 8 is the circuit diagram of the Energizing unit according to employed in one embodiment of the present of invention；And
Fig. 9-10 is the wind generator system work flow diagram according to the embodiment of the present invention.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, the embodiment of the present invention is made below in conjunction with attached drawing
Further it is described in detail.
Illustrate: the end a of the corresponding similar figure three of the first ac input end of three level blocks unit mentioned herein, the
The end b of the corresponding similar figure three of two ac input ends.
Fig. 1 is the structural block diagram using the synchronous wind generating system of converter topologies in the prior art.Such as
Shown in Fig. 1,101 be electrical excitation synchronous generator, 102 be motor side current transformer, 103 be grid-side converter, 104 be double winding become
Depressor and 105 be DC chopper circuit.
Wherein, motor side current transformer 102, grid-side converter 103 are connected with two DC side filter capacitors, motor side unsteady flow
The three-phase alternating current end of device 102 is connect with electrical excitation synchronous generator 101, the DC terminal and net side unsteady flow of motor side current transformer 102
Device 103 is connected by common DC bus, and the exchange of grid-side converter 103 is flanked to the secondary transformer of transformer, transformer
Primary side high pressure is connect with power grid；It additionally include DC chopper circuit 105, DC chopper circuit 105 is connected to grid-side converter
103 DC bus, motor side current transformer 102 and grid-side converter 103 generally use two traditional level current transformers.
Two level current transformers include the power device of power diode and controllable switch, have the identical bridge arm of 3 phase structures, often
Phase bridge arm includes two IGBT (carrying antiparallel diode) power device compositions.Since current single IGBT device is by electricity
The limitation of pressure, electric current, this kind of topological current transformer power are generally less than 2MW.There are two types of conventional solutions: first by pair
Device is connected in parallel, and output electric current is increased；Second, motor is changed to multiwinding machine, each current transformer is connected to motor
A winding.But both of which increases the complexity of system, and substantially output voltage is all lower, it is certain in power
In the case where, the more low then electric current of voltage is bigger, and which adds the cost of cable and losses.
Although the above current transformer can satisfy the requirement of 660V and 690V voltage class.But with the hair at full speed of science and technology
The voltage class of exhibition, 660V and 690V have been far from satisfying the needs of this large-power occasions of Oversea wind power generation, because
This, there is an urgent need to meet the current transformer of voltage levels on the market at present.
Fig. 2 is using the synchronization according to an embodiment of the invention for realizing current transformer with three level block unit groups
The structural block diagram of wind generator system.As shown in Fig. 2, synchronous generator system 200 include acquisition unit 201, control unit 202,
Generator module 203, three level block unit groups 204, multiwinding transformer 205, power supply grid 206 and Energizing unit 207.
Wherein, Energizing unit 207 can choose whether to select according to the actual situation.
Acquisition unit 201 is connected on generator module 203, to acquire the reality of the generator in generator module 203
Luck line number is accordingly and the voltage on line side on power supply grid 206, current on line side.In the present invention, acquisition unit 201 includes electric current
Sensor.In general, current sensor is placed on the ac output end of generator, to detect alternating current on generator output end
Real-time operating current data.In addition, current sensor also can be placed in power supply grid net side, to detect the reality of power supply grid
When current data.
However, the acquisition the present invention is not limited to above-mentioned current sensor as acquisition unit progress data, in fact also
The operation data of power generation can be detected using voltage sensor, in general, voltage sensor can be placed on the exchange of generator
Output end, to detect the voltage data of generator output end.In addition, voltage sensor also can be placed in power supply grid net side,
To detect the real-time voltage data of power supply grid.In addition, voltage sensor also can be placed in the intermediate DC link of current transformer,
To detect the voltage data of current transformer.
Electricity generation system also includes control unit 202, is connect with acquisition unit 201, is sent to receive acquisition unit 201
Generator module 203 on real-time running data and voltage on line side and current on line side, control unit 202 will be to acquisition unit
The data of 201 acquisitions are analyzed and are corrected, and are assessed to the real-time status to generator and power supply grid 206.
In addition, control unit 202 include but is not limited to connect with middle control platform, in reception control platform on operator it is real-time
Instruction.The acquisition data and the middle real-time command for controlling operator's transmission on platform that control unit 202 combines acquisition unit 201 to send
Generate at least current transformer triggering command.
Generator module 203, including three-phase synchronous alternator, to generate alternating current.Generator generally comprises forever
Magnetic generator and excitation generator, excitation generator, the winding of excitation generator are divided into two portions of stator winding and excitation winding
Point, the three-phase alternating current input terminal connection of stator winding and current transformer；Excitation winding is connect with 207 direct current output of Energizing unit.Such as
The type of fruit generator is permanent magnet generator, then wind generator system then need not include Energizing unit 207.Permanent-magnet synchronous power generation
Machine is made of the stator fixed and rotatable PM rotor two large divisions.Due to the opposite cutting between winding and main field
Activity will induce size and Orientation by periodically variable three-phase symmetrical alternating potential in winding.Pass through lead-out wire
AC power source is provided.
Three level block unit groups 204, are connected on generator module 203 and control unit 202, to single according to control
The triggering command that member 202 is sent, the speed for controlling the variation of generator module 203 export fixation after controlled rectification and inversion
The alternating current of the first estate of frequency.
It includes 3 three level block unit groups 204 that wind generator system, which has altogether, in one embodiment of the present of invention, wherein often
A three level blocks unit group 204 all includes N number of three level blocks unit, therefore wind generator system includes 3*N three electricity altogether
Flat-die module unit, each three level blocks unit are connect with multiwinding transformer 205.Wherein, three level block unit group 204
Connecting line details and the interior details of three level block units will be discussed in detail in Fig. 3 and Fig. 7, be just not added herein superfluous
It states.
Multiwinding transformer 205 is connect with three level block unit groups 204, to three level block unit groups 204 are defeated
The alternating current of the first estate out is converted to the alternating current of the second grade, and is output to 206 net side of power supply grid.
Wherein, multiwinding transformer should have 3*N three phase connection, to connect N number of three level blocks unit.Multiple coil
Transformer fe is wound with the transformer of a primary side winding and several auxiliary winding in the heart.The number of turns of each auxiliary winding is different, then its end
Voltage is also different, therefore multiwinding transformer can be to the power supply for electrical equipment of several different voltages.
One embodiment of the present of invention as shown in Figure 2 acquires on synchronous generator due to using acquisition unit 201
Collected data are simultaneously sent to control unit 202, therefore the present invention by real time data, voltage on line side and current on line side in time
The real-time status of synchronous generator and power supply grid can be understood in real time, it is ensured that synchronous generator and power supply grid 206 are normal
Work, additionally, due to using three level block unit groups 204 rather than the structure of single three level blocks unit, therefore this hair
The bright demand that can satisfy voltage levels.
Fig. 3 is to show the block diagram of the inside joint detail of three level block unit groups in current transformer shown in Fig. 2.Such as
Shown in Fig. 3, synchronous generator system 200 includes acquisition unit 201, control unit 202, generator module 203, three level blocks
Unit 20411, three level block units 20421, multiple three level blocks units such as three level block units 20431, Multiple coil
Transformer 205, power supply grid 206 and Energizing unit 207.The connection that Fig. 3 focuses on to illustrate three level block unit groups 204 is thin
Section.
Since Fig. 3 is detail view on the basis of Fig. 2, Fig. 3 and Fig. 2's the difference is that only three level block unit groups
204, therefore this part no longer will excessively introduce other parts, will focus on and introduce three level block unit groups 204.
Each three level blocks unit group 204 includes N number of three level blocks unit, due to wind generator system of the invention
In include 3 phase, three level block unit group 204, therefore wind generator system of the invention includes 3*N three level block lists altogether
Member, number are respectively 20411-2041N, 20421-2042N, 20431-2043N, three level block unit groups between phase and phase
204 are connected in parallel, and the first ac input end, that is, end a of three level block unit of previous stage is connected to three level block list of rear stage
On the second ac input end, that is, end b of member, i.e. the first ac input end of three level block units 20411 is connected to three level moulds
Second ac input end of module unit 20412, the first ac input end of three level block units 20412 are connected to three level moulds
Second ac input end of module unit 20413, and so on, until three level block unit 2041N of afterbody.
In addition, cascade connection between the three level block units that three level block unit groups 204 include, every phase first order three
Second ac input end of level block unit is connected with each other, i.e. the second ac input end of three level block units 20411, three
The connection of second ac input end of the second ac input end of level block unit 20421 and three level block units 20431
Together.In addition the first ac input end of three level block unit 2041N, 2042N and 2043N of afterbody is separately connected
In the A phase, B phase and C phase of synchronous generator 2031, to receive the alternating current of synchronous generator generation.In addition, each three
Level block unit is connect with multiwinding transformer 205.
By cascading above and combination in parallel, the range of the compatible voltage class of current transformer, Neng Gouman are greatly expanded
The mainstream voltage class of foot on the market.
Fig. 4 shows d, q axis equivalent circuit diagram of a kind of excitation synchronous generator in the prior art.
In excitation synchronous generator control, in order to obtain the control characteristic of similar direct current generator, turn in generator
A coordinate system is established on son, this coordinate system and rotor rotate synchronously, and taking rotor field direction is d axis (d-axis), perpendicular to
Rotor field direction is q axis (quadrature axis).
Electric excitation synchronous motor (undamped winding) ignores magnetic field saturation, the mathematical model under synchronous rotary dq coordinate system
It can indicate are as follows:
Voltage equation:
Flux linkage equations:
Torque equation:
Te=1.5P [Ladif+(Ld-Lq)id]iq
Wherein: p is differential divisorud, uqFor d, q spindle motor end voltage；id, iq, ifFor d, q axis stator current, excitation
Winding current；R, Ld, Lq, LadInductance is reacted for stator resistance, d axle inductance, q axle inductance, d armature axis；φsd, φsq, φsIt is fixed
Sub- d axis magnetic linkage, stator q axis magnetic linkage, stator magnetic linkage amplitude；ωr, TeFor motor angular rate, motor electromagnetic torque.
The mathematical model of generator is transformed under this coordinate system, it can be achieved that the decoupling of d axis and q axis, to obtain good
Control characteristic.Therefore, excitation synchronous generator has many advantages, such as that overload capacity is strong, high-efficient, power factor is adjustable.
Fig. 5 is the output 6KV voltage gradation realized with three level block unit groups according to one embodiment of the present of invention
Synchronous wind generating system structural block diagram, as shown in figure 5, including generator side current sensor 2011, excitation list
First side current sensor 2012, control unit 202, generator module 203, Energizing unit 207, three level block units 20411,
20421 and 20431, multiwinding transformer 205 and power supply grid 206.
Wherein, generator side current sensor 2011 is used to acquire the real time data of generator on generator module 203,
In, real time data includes the real-time current data of generator module 203, and Energizing unit side current sensor 2012 is encouraged for acquiring
Real time data in magnetic cell 207, wherein real time data includes the real-time current data of Energizing unit 207, synchronous generator pusher side
The real-time current data of generator on collected generator module 203 are sent to control unit 202 by current sensor 2011,
Control unit 202 judges whether generator is in normal operating conditions on generator module 203 according to real-time current data, separately
Outside, Energizing unit side current sensor 2012 by the real-time current data of generator on collected generator module 203 send to
Whether control unit 202, control unit 202 judge Energizing unit 207 in normal operating conditions according to real-time current data.
Generator is for exporting alternating current to three level block unit groups 204, if generator module on generator module 203
Generator is magneto alternator on 203, then dashed box part, that is, Energizing unit 207 can simplify in figure.Energizing unit 207 connects
Connect the first DC output end in three level block units 20411.To provide excitation electricity for generator on generator module 203
Stream.Energizing unit is discussed in detail referring to Fig. 8.
Wind generator system in one embodiment of the present of invention includes 3 phase, three level block unit group totally 3 three level
Modular unit, respectively three level block units 20411,20421 and 20431, the second of three level block units 20411 are handed over
Flow the second exchange of input terminal, the second ac input end of three level block units 20421 and three level block units 20431
It is connected in parallel between input terminal, in addition, the first ac input end of three level block units 20411, three level block units
First ac input end of 20421 the first ac input end and three level block units 20431 is connected to synchronous hair
In the A phase of motor 2031, B phase and C phase.First ac output end of three level block units 20411, three level block units
First ac output end of 20421 the first ac output end and three level block units 20431 is both connected to Multiple coil change
On depressor 205.Multiwinding transformer 205 receives the alternating current of three level block unit groups 204 output and converts to needed for power grid
6KV voltage be delivered to power supply grid 206.
Three level block unit groups 204 pass through three level blocks in wind generator system in one embodiment of the present of invention
Cascade and parallel connection between unit, the needs of producing high voltage with 6KV voltage gradation needed for meeting power supply grid 206.
Fig. 6 is the output 10KV voltage gradation realized with three level block unit groups according to one embodiment of the present of invention
Synchronous wind generating system structural block diagram, as shown in fig. 6, including generator side current sensor 2011, excitation list
First side current sensor 2012, control unit 202, generator module 203, Energizing unit 207, three level block units 20411,
20412,20421,20422,20431 and 20432, multiwinding transformer 205 and power supply grid 206.
Wherein, the difference of Fig. 6 and Fig. 5 is only that three level block unit groups, therefore this part will not be described in great detail other moulds
Block.
It include 3 phase, three level block list in the wind generator system 10KV voltage class scheme of one embodiment of the present of invention
Tuple 204, wherein each three level blocks unit group 204 separately includes 2 three level blocks.
Wherein, the second friendship of the second ac input end of three level block units 20411, three level block units 20421
It is connected in parallel between stream input terminal and the second ac input end of three level block units 20431, three level block units
20411 the first ac input end is connected to the second ac input end of three level block units 20412, three level block units
20421 the first ac input end is connected to the second ac input end of three level block units 20422, three level block units
20431 the first ac input end is connected to the second ac input end of three level block units 20432, in addition, three level moulds
The first ac input end and three level blocks of first ac input end of module unit 20412, three level block units 20422
First ac input end of unit 20432 is connected in the A phase, B phase and C phase of synchronous generator 2031, three level moulds
First ac output end of module unit 20411, the first ac output end of three level block units 20412, three level block lists
Member 20421 the first ac output end, three level block units 20422 the first ac output end, three level block units
First ac output end of 20431 the first ac output end and three level block units 20432 is both connected to Multiple coil change
On depressor 205.Multiwinding transformer 205 receives the alternating current of three level block unit groups 204 output and converts to needed for power grid
10KV voltage be delivered to power supply grid 206.
Three level block unit groups 204 pass through three level blocks in wind generator system in one embodiment of the present of invention
Cascade and parallel connection between unit, the needs of producing high voltage with 10KV voltage gradation needed for meeting power supply grid 206.
Fig. 7 is that the circuit of the three level block unit of diode clamp according to employed in one embodiment of the present of invention is former
Reason figure.As shown in fig. 7, wherein including the identical bridge arm of 5 phase structures, every phase bridge arm has a power device of four controllable switches, two
Clamp diode and four freewheeling diodes, the power device of four controllable switches respectively with four freewheeling diode inverse parallels
Connection, power diode series connection, and, topological structure two that parallel connection formed in parallel with the power device of concatenated two controllable switches
It connects respectively with two power devices at end.
Fig. 8 is the circuit diagram of the Energizing unit according to employed in one embodiment of the present of invention.As shown in figure 8,
It wherein include three level phase modules 801, resonance modules 802 (Lf, Cf), high frequency transformer module 803 (HTR), uncontrollable rectifier mould
Block 804, output LC module 805, copped wave module 806 (T5, R1).
Wherein, resonance modules 802 (Lf, Cf), high frequency transformer module 803 (HTR), uncontrollable rectifier module 804 are incorporated in
Part together decides whether to select again according to the design of excitation voltage and the parameter of DC voltage.If excitation voltage and three electricity
Flat module DC voltage gap is very big, then can select, for example, depending on excitation voltage 100v, the total DC voltage of three level
4500V, then the HTR high frequency voltage descending selected in the module is to improve dynamic and steady state effect.It can lead to when DC voltage is excessively high
Copped wave access (T5 and R1) is crossed to release energy.
Fig. 9-10 is the wind generator system work flow diagram according to the embodiment of the present invention.Fig. 9 is to select excitation generator
When wind generator system work flow diagram；Figure 10 is wind generator system work flow diagram when selecting permanent magnet generator.
As shown in Figure 9: progress step 901 first judges whether operator issues enabled instruction.This step is sent out in wind-force
Electric system is immediately performed after powering on, in order to judge that wind generator system is standby after the power-up or is actuated for immediately
Next step.If operator does not send enabled instruction, system will execute step 902, open if operator has sent
Dynamic instruction, then system will execute step 903；
In step 902, wind-power electricity generation enters standby mode.If operator does not issue enabled instruction, illustrate
Operator does not need starting wind generator system, then the starting that wind generator system enters standby mode waiting operator refers to
It enables；
In step 903, judge wind generator system with the presence or absence of failure.If operator issues enabled instruction, then saying
Bright operator needs to start wind generator system, then wind generator system carries out fault detection to ensure wind generator system energy
It is enough to operate normally；
Then, in step 904, faulting instruction is returned to middle control platform.If failure detection result shows wind-power electricity generation system
There are failures for system, then are transferred to this step for fault condition and report to middle control platform, the next step instruction of platform is controlled in waiting.If therefore
Hinder testing result and show that failure is not present in wind generator system, then system will execute step 905；
Step 905 be control unit send current transformer triggering command, i.e., wind power system and be not present failure, current transformer is at any time
It is prepared to enter into wind-power electricity generation process；
So far, monitoring early period of wind generator system has been completed, and wind generator system will be transferred to step 906.Deng
The parameter that this wind-power electricity generation is inputted to operator, is ready for wind-power electricity generation.
System executes step 907, and Energizing unit is started to work, since the generator in this system is excitation generator, institute
With the start-up operation of Energizing unit in this step, for providing exciting current.
System executes step 908, and acquisition unit acquires on real-time running data and power supply grid on synchronous generator
Voltage on line side, current on line side, this step is the Primary Stage Data collecting work after wind generator system power generation starts, to supervise in real time
The operation data of control system, it is ensured that system worked well；
Then system executes step 909, and control unit is computed according to the power instruction of host computer and sends three level triggers
Instruction starts three level block unit groups, controls the size of generator unit stator electric current；And dynamic adjusts the size of exciting current,
Alternating current to the output of commutation synchronization generator；Then step 9010 is executed, three level block unit groups export alternating current；
Finally execute step 9011, voltage needed for multiwinding transformer exports power supply grid.
As shown in Figure 10: progress step 1001 first judges whether operator issues enabled instruction.This step is in wind-force
Electricity generation system is immediately performed after powering on, in order to judge wind generator system be it is standby after the power-up or start immediately into
Row next step.If operator does not send enabled instruction, system will execute step 1002, if operator has sent
Enabled instruction, then system will execute step 1003；
Step 1002, wind-power electricity generation enters standby mode.If operator does not issue enabled instruction, illustrate to operate
Member does not need starting wind generator system, then wind generator system enters the enabled instruction that standby mode waits operator；
Then, in step 1003, judge wind generator system with the presence or absence of failure.If operator issues enabled instruction,
So illustrate that operator needs to start wind generator system, then wind generator system carries out fault detection to ensure wind-power electricity generation
System can operate normally；
In step 1004, faulting instruction is returned to middle control platform.If failure detection result shows that wind generator system is deposited
In failure, then this step is transferred to by fault condition and reports to middle control platform, the next step instruction of platform is controlled in waiting.If failure is examined
It surveys wind generator system as the result is shown and failure is not present, then system will execute step 1005；
Step 1005 be control unit send current transformer triggering command, i.e., wind power system and be not present failure, current transformer with
When be prepared to enter into wind-power electricity generation process；
So far, monitoring early period of wind generator system has been completed, and wind generator system will be transferred to step 1006.Deng
The parameter that this wind-power electricity generation is inputted to operator, is ready for wind-power electricity generation.
System executes step 1007, and acquisition unit acquires on real-time running data and power supply grid on synchronous generator
Voltage on line side, current on line side, this step is the Primary Stage Data collecting work after wind generator system power generation starts, to supervise in real time
The operation data of control system, it is ensured that system worked well；
Then system executes step 1008, and control unit sends the instruction of three level triggers, starts three level block unit groups,
Alternating current to the output of commutation synchronization generator；Then step 1009 is executed, three level block unit groups export alternating current；
Finally execute step 1010, voltage needed for multiwinding transformer exports power supply grid.
It should be understood that disclosed embodiment of this invention is not limited to specific structure disclosed herein, processing step
Or material, and the equivalent substitute for these features that those of ordinary skill in the related art are understood should be extended to.It should also manage
Solution, term as used herein is used only for the purpose of describing specific embodiments, and is not intended to limit.
" one embodiment " or " embodiment " mentioned in specification means the special characteristic described in conjunction with the embodiments, structure
Or characteristic is included at least one embodiment of the present invention.Therefore, the phrase " reality that specification various places throughout occurs
Apply example " or " embodiment " the same embodiment might not be referred both to.
While it is disclosed that embodiment content as above but described only to facilitate understanding the present invention and adopting
Embodiment is not intended to limit the invention.Any those skilled in the art to which this invention pertains are not departing from this
Under the premise of the disclosed spirit and scope of invention, any modification and change can be made in the implementing form and in details,
But scope of patent protection of the invention, still should be subject to the scope of the claims as defined in the appended claims.
Claims (10)
1. a kind of current transformer for synchronous motor wind generator system, which is characterized in that the current transformer includes:
Acquisition unit is connected on three-phase synchronous generator and power supply grid, to acquire on the three-phase synchronous generator
Real-time running data and voltage on line side, current on line side on the power supply grid；
Control unit is connect with the acquisition unit, the three-phase synchronous power generation sent to receive the acquisition unit
The real-time running data of machine and the voltage on line side and the current on line side, and according to the real-time running data and the net
Side voltage and current on line side generate at least current transformer triggering command；
Three level block unit groups, are connected to the three-phase synchronous generator, described control unit, excitation winding and Multiple coil
On transformer, to the triggering command sent according to described control unit, by the exchange of the variation of the three-phase synchronous generator
Electricity is controlled and is converted, and the alternating current of fixed frequency the first estate is exported after rectified and inversion；
Wherein, the three level blocks unit group being connect with each phase in the three-phase synchronous generator includes at least one
A three level blocks unit, each unit of modular unit group include three-phase alternating current part and single phase ac part, three-phase alternating current
Part is connect with transformer, and single phase ac part is connect after cascading with synchronous motor.Single-phase portion connects after cascade connection
Onto the threephase stator winding of generator；It particularly points out, for electrical excitation synchronous generator, there is a three special level powers
Unit has been also connected to Energizing unit, and output is connected in the excitation winding of generator；
Multiwinding transformer is connect with the three level blocks unit group, to export the three level blocks unit group
The alternating current of described the first estate be converted to the alternating current of the second grade, and be output to the power supply grid side.
2. current transformer as described in claim 1, which is characterized in that the three level blocks unit group between phase and phase uses
As under type is attached:
Second ac input end of three level block units described in every phase first order is connected with each other.
3. current transformer as claimed in claim 2, which is characterized in that three level that the three level blocks unit group includes
Cascade connection is carried out between modular unit in the following way:
First ac input end of three level block units described in previous stage is connected to three level block units described in rear stage
On second ac input end.
4. current transformer as claimed in claim 3, which is characterized in that the three level blocks unit group and the Multiple coil transformation
Device is attached in the following way:
The ac output end of each of three level block unit groups three level blocks unit described in every phase is both connected to institute
It states on multiwinding transformer.
5. current transformer as claimed in claim 4, which is characterized in that the three level blocks unit group and the three-phase synchronous are sent out
Motor is attached in the following way:
First ac input end of three level block units described in the afterbody of three level block unit groups described in every phase and institute
The three-phase alternating current output end for stating three-phase synchronous generator connects one to one.
6. current transformer according to any one of claims 1 to 5, which is characterized in that described control unit and middle control platform carry out
Communication connection receives the control instruction of operator to determine whether to send triggering command.
7. a kind of synchronous wind generating system, which is characterized in that the system comprises:
Three-phase synchronous generator is used to generate electricity；
Such as current transformer of any of claims 1-6.
8. synchronous wind generating system as claimed in claim 7, which is characterized in that the three-phase synchronous generator is that permanent magnetism is same
Walk generator.
9. synchronous wind generating system as claimed in claim 8, which is characterized in that the three-phase synchronous generator is that excitation is same
Generator is walked, wherein Energizing unit includes:
Three level phase modules, by the three level block unit of the first order in three level block unit groups described in the first phase
The first order direct current of DC output end output is converted to second level alternating current；
Resonance circuit module shifts energy to generate resonance；
High frequency transformer module, the second level alternating current is converted to third level alternating current；
Uncontrollable rectifier module, the third level alternating current is converted into fourth stage direct current；
LC module is exported, to be filtered to output voltage；And
Copped wave module, can be released energy by copped wave access when DC voltage is excessively high.
10. system as claimed in claim 9, which is characterized in that described control unit sends triggering command to the excitation list
Member triggers the Energizing unit.
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| CN201710567986.4A CN109256794B (en) | 2017-07-12 | 2017-07-12 | Converter for synchronous wind power generation system |
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| CN112737469A (en) * | 2020-12-31 | 2021-04-30 | 徐州中矿大传动与自动化有限公司 | Electrically excited synchronous motor variable frequency driving device and control method |
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| CN109256794B (en) | 2021-05-07 |
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