CN207410046U - A kind of fault ride-through of power grid system based on double-fed fan motor field - Google Patents
A kind of fault ride-through of power grid system based on double-fed fan motor field Download PDFInfo
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- CN207410046U CN207410046U CN201721427821.9U CN201721427821U CN207410046U CN 207410046 U CN207410046 U CN 207410046U CN 201721427821 U CN201721427821 U CN 201721427821U CN 207410046 U CN207410046 U CN 207410046U
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Abstract
The utility model provides a kind of fault ride-through of power grid system based on double-fed fan motor field, including：Multiple dual-feed asynchronous wind power generators, inversion unit, isolating transformer, rectification unit, series compensator and coupling transformer；Isolating transformer includes at least one vice-side winding；The corresponding inversion unit of DC side connection of any generator；It is connected after multiple inversion unit cascades with the primary side winding of isolating transformer；The corresponding rectification unit of any vice-side winding connection of isolating transformer, any rectification unit connect series compensator, the primary side of any corresponding coupling transformer of series compensator connection；The three-phase line series connection that the secondary of three coupling transformers is connected respectively with double-fed fan motor field and power grid.System provided by the utility model has removed conventional compensation device DC side energy storage device, has reduced production cost, by series compensator injecting compensating voltage, ensures the fault traversing operation of double-fed fan motor field.
Description
Technical field
The utility model is related to applied power electronics technical field more particularly to a kind of power grid events based on double-fed fan motor field
Hinder ride through system.
Background technology
Dual-feed asynchronous wind power generator (DFIG, Double-Fed Induction Generator) is a kind of Wound-rotor type sense
Generator is answered, possesses the features such as active and reactive power independent control, variable-ratio operation and exciter converter capacity is small, is speed change
One of critical component of core component and wind power generating set production domesticization of constant-frequency wind turbine generator group.
At present, the Large-scale Wind Power field capacity based on double-fed fan motor field is constantly promoted so that the type electricity generation system
It is more and more important with influencing each other for power grid.Since the stator of dual-feed asynchronous wind power generator is directly connected with power grid, work as power grid
It breaks down, when causing network voltage rapid drawdown, power generator electrode is also easy to produce overvoltage and overcurrent, therefore should take effective measures
Overvoltage overcurrent problem when avoiding electric network fault so that double-fed asynchronous generator wind power system possesses certain failure
Ride-through capability, how to further improve double-fed wind field becomes the heat of current research in the uninterrupted operation ability of grid fault conditions
Point problem.
Utility model content
To be easy to cause dual-feed asynchronous wind power generator excessively electric to solve electric network fault exists in the prior art for the utility model
The problem of pressing through electric current provides a kind of fault ride-through of power grid system based on double-fed fan motor field.
The utility model proposes a kind of fault ride-through of power grid system based on double-fed fan motor field, including：It is multiple double-fed asynchronous
Wind-driven generator, multiple inversion units, an isolating transformer, at least one rectification unit, at least one series compensator and
Three coupling transformers；The isolating transformer is made of a primary side winding and at least one vice-side winding；The series connection is mended
Device is repaid to be made of inverter and wave filter；Each dual-feed asynchronous wind power generator corresponds to an inversion unit, any
The DC side of dual-feed asynchronous wind power generator connects the input side of corresponding inversion unit；The outlet side of the multiple inversion unit
Primary side winding after cascade with the isolating transformer is connected；Each vice-side winding of isolating transformer corresponds to a rectification
Unit and a series compensator, the input side of the corresponding rectification unit of any vice-side winding connection of the isolating transformer, appoint
The input side of the corresponding series compensator of outlet side connection of one rectification unit, the outlet side of any series compensator connect
Connect the primary side of corresponding coupling transformer；The secondary of three coupling transformers is connected respectively with the double-fed fan motor field and power grid
Three-phase line series connection.
Preferably, three by-pass switches are further included, each by-pass switch corresponds to a coupling transformer, any
The by-pass switch and the secondary of the corresponding coupling transformer are in parallel；When electric network state is normal, the by-pass switch closes
It closes.
Preferably, the quantity of the vice-side winding of the isolating transformer, rectification unit and series compensator is three.
Preferably, the inversion unit is H bridge inverter unit；The rectification unit is uncontrollable rectifier unit.
Preferably, the inverter in the series compensator is full-bridge inverting unit, and the switch in the inverter is
IGBT。
A kind of fault ride-through of power grid system based on double-fed fan motor field provided by the utility model, is cascaded by multiple DFIG
Energy is provided for series compensator by isolating transformer afterwards, instead of the energy storage device of conventional compensation device DC side, is reduced
Production cost.During grid collapses, injected suitably into the circuit that wind power plant is connected with power grid by series compensator
Offset voltage inhibits the rotor overcurrent and overvoltage of double-fed wind turbine, ensures the fault traversing operation of double-fed fan motor field.
Description of the drawings
Fig. 1 is a kind of structure of fault ride-through of power grid system based on double-fed fan motor field of the utility model specific embodiment
Schematic diagram；
Fig. 2 is the structure diagram of the current transformer of dual-feed asynchronous wind power generator；
Fig. 3 is a kind of structure of fault ride-through of power grid system based on double-fed fan motor field of the utility model specific embodiment
Schematic diagram；
Fig. 4 is the structure diagram of H bridge inverter unit；
Fig. 5 is the structure diagram for not controlling type full-bridge rectification unit；
Fig. 6 is the breakdown judge of the utility model specific embodiment and the control block diagram of series compensator；
Fig. 7 is the control block diagram of the dual-feed asynchronous wind power generator DC voltage of the utility model specific embodiment.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiment of the present utility model is described in further detail.Below
Embodiment is not intended to limit the scope of the present invention for illustrating the utility model.
Fig. 1 is a kind of structure of fault ride-through of power grid system based on double-fed fan motor field of the utility model specific embodiment
Schematic diagram, as shown in Figure 1, the fault ride-through of power grid system based on double-fed fan motor field, including：Multiple double-fed asynchronous wind-power electricity generations
Machine, multiple inversion units, an isolating transformer, at least one rectification unit, at least one series compensator and three couplings
Transformer；The isolating transformer is made of a primary side winding and at least one vice-side winding；The series compensator is by inverse
Become device and wave filter is formed；Each dual-feed asynchronous wind power generator corresponds to an inversion unit, any double-fed asynchronous
The input side of the corresponding inversion unit of DC side connection of wind-driven generator；The multiple inversion unit outlet side cascade after with institute
State the primary side winding connection of isolating transformer；Each vice-side winding of isolating transformer corresponds to a rectification unit and one
Series compensator, the input side of the corresponding rectification unit of any vice-side winding connection of the isolating transformer, any rectification
The input side of the corresponding series compensator of outlet side connection of unit, the corresponding coupling of outlet side connection of any series compensator
The primary side of transformer；The three-phase line that the secondary of three coupling transformers is connected respectively with the double-fed fan motor field and power grid
Series connection.
Specifically, the fault ride-through of power grid system based on double-fed fan motor field includes multiple dual-feed asynchronous wind power generators
(DFIG, Double-Fed Induction Generator), DFIG is the wind-driven generator being most widely used at present, by fixed
The direct-connected winding type asynchronous generator for determining frequency three phase network of sub- winding and the two-way back-to-back IGBT electricity on rotor windings
Source converter forms, and Fig. 2 is the structure diagram of the current transformer of dual-feed asynchronous wind power generator, with reference to figure 2, mounted on rotor
The ac voltage rectifier that voltage source converter on winding generates DFIG is DC voltage.The utility model specific embodiment
In, by the DC side of DFIG, i.e. the dc bus of DFIG current transformers is connected with inversion unit, due to the system include it is multiple
DFIG, then corresponding in the system to include the inversion unit identical with DFIG quantity, the inversion unit is by DFIG DC sides
DC voltage is reverse into alternating voltage.
In addition, the outlet side of the multiple inversion unit is cascade structure, and it is connected with the primary side winding of isolating transformer.
The voltage of corresponding multiple DFIG DC sides is overlapped by the multiple inversion unit after inversion by cascade, is input to
The primary side of the isolating transformer.
The secondary of the isolating transformer includes at least one vice-side winding, alternating voltage after cascade after conversion by
Vice-side winding exports, and isolating transformer is used for electrical isolation, while the turn ratio control for passing through primary and secondary side winding coil herein
The size of vice-side winding output AC voltage processed, and by determining that the quantity of vice-side winding determines of corresponding series compensator
Number.
The quantity of the vice-side winding of the isolating transformer is consistent with the quantity of rectification unit and series compensator, each pair
Side winding corresponds to a rectification unit and a series compensator.The alternating voltage of vice-side winding output is converted by rectification unit
For DC voltage, series compensator is subsequently input.
The series compensator includes inverter and wave filter.DC voltage is converted to alternating current by inverter first
Pressure, the filtered device filtering of alternating voltage of subsequent inverter output, inverter described herein can be by controlling pulse come real
Now to the control of inverter output voltage size, in addition, the wave filter is preferably choke-condenser filter (LC wave filter), but
It is without being limited thereto.
The output of the series compensator is connected with the primary side of coupling transformer, the coupling transformer altogether there are three, three
One in the three-phase line that the secondary of a coupling transformer is connected respectively with the double-fed fan motor field and power grid is in series.
To sum up, the DC side of multiple DFIG is after inversion unit by cascading, after isolating transformer and rectification unit with
Series compensator connects, and energy is provided for series compensator.
In the utility model specific embodiment, energy is provided for series compensator after multiple DFIG cascades by isolating transformer
Amount, instead of the energy storage device of conventional compensation device DC side, reduces production cost.During grid collapses, pass through series connection
Compensator injects appropriate offset voltage into the circuit that wind power plant is connected with power grid, inhibit double-fed wind turbine rotor overcurrent and
Overvoltage ensures the fault traversing operation of double-fed fan motor field.
In the utility model specific embodiment, by the DC side of multiple DFIG by being cascaded after inversion unit, mended for series connection
It repays device and energy is provided.Cascade after plurality of DFIG DC voltages inversion improves the energy for being transferred to series compensator,
Loss and the efficiency of the power that additional energy storage device causes the increase of cost and the addition of new one-stage transfor-mation device to bring are evaded
Reduction, widened the adjustable range of series compensator, improved the regulating power of series compensator.
Based on above-mentioned specific embodiment, Fig. 3 is a kind of electricity based on double-fed fan motor field of the utility model specific embodiment
The structure diagram of net fault traversing system, as shown in figure 3, a kind of fault ride-through of power grid system based on double-fed fan motor field, also
Including three by-pass switches, each by-pass switch corresponds to a coupling transformer, any by-pass switch with it is right
The secondary for the coupling transformer answered is in parallel；When electric network state is normal, the by-pass switch is closed,.
Specifically, three by-pass switches are in parallel with the secondary of three coupling transformers respectively.
When network voltage is normal, three by-pass switches are closed, and coupling transformer is bypassed, and electric current is opened by bypass
Close and without the secondary of coupling transformer.
When the grid collapses, three by-pass switches disconnect, and the secondary of coupling transformer is accessed the double-fed
In the three-phase line that wind power plant is connected with power grid, circuit that series compensator is connected by coupling transformer to wind power plant with power grid
The appropriate offset voltage of middle injection ensures the fault traversing operation of double-fed fan motor field.
In the utility model specific embodiment, the application of by-pass switch under power grid normal operating condition, reduces circuit
Loss.
Based on any of the above-described specific embodiment, a kind of fault ride-through of power grid system based on double-fed fan motor field, the isolation
The quantity of the vice-side winding of transformer, rectification unit and series compensator is three.
Specifically, with reference to figure 3, the quantity of the vice-side winding of the isolating transformer, rectification unit and series compensator is
Three, the output of three series compensators is respectively used to compensate one in the three-phase line that the double-fed fan motor field is connected with power grid
Phase, each phase independent control there is no the phenomenon that coupling, realize asymmetric voltage compensation.
Based on any of the above-described specific embodiment, Fig. 4 is the structure diagram of H bridge inverter unit, and Fig. 5 is whole not control type full-bridge
The structure diagram of unit is flowed, with reference to figure 4 and Fig. 5, a kind of fault ride-through of power grid system based on double-fed fan motor field, the inversion
Unit is H bridge inverter unit；The rectification unit is uncontrollable rectifier unit.
Specifically, the inversion unit is H bridge inverter structures, using unipolarity carrier level phase shift sinusoidal pulse width modulation skill
Art by controlling the size of carrier wave ratio, realizes the output of inversion unit maximum level.
The rectification unit is uncontrollable rectifier structure, realizes rectifying operation using type device is not controlled, the utility model is specific
Full-bridge rectification structure is built using diode in embodiment, the control strategy of system is simplified, reduces manufacture cost.
Based on any of the above-described specific embodiment, a kind of fault ride-through of power grid system based on double-fed fan motor field, the series connection
Inverter in compensator is full-bridge inverting unit, and the switch in the inverter is IGBT.
Based on any of the above-described system specific embodiment, a kind of fault ride-through of power grid method based on double-fed fan motor field, including：
S1 during grid collapses, releases the switch block of the inverter in series compensator, controls the series compensator to double-fed
The circuit injecting compensating voltage that wind power plant is connected with power grid；Wherein, the energy of the series compensator is different by the multiple double-fed
The DC side of wind-driven generator is walked by being cascaded after inversion unit, and is provided by isolating transformer and rectification unit.
Specifically, when finding current electric grid there are during failure, the switch block of inverter, multiple in releasing series compensator
The voltage of DFIG DC sides is converted to alternating voltage rear class by inversion unit and couples the primary side into isolation isolating transformer, by institute
The alternating voltage for stating the secondary output of isolation isolating transformer is converted to DC voltage input series compensator by rectification unit,
Energy is provided for series compensator, after series compensator inversion and filtering, is by the alternating voltage that series compensator exports
Offset voltage, the circuit connected by coupling transformer injection double-fed fan motor field with power grid.
In the utility model specific embodiment, energy is provided for series compensator after multiple DFIG cascades by isolating transformer
Amount, instead of the energy storage device of conventional compensation device DC side, reduces production cost.During grid collapses, pass through series connection
Compensator injects appropriate offset voltage into the circuit that wind power plant is connected with power grid, inhibit double-fed wind turbine rotor overcurrent and
Overvoltage ensures the fault traversing operation of double-fed fan motor field.
Based on any of the above-described specific embodiment, a kind of fault ride-through of power grid method based on double-fed fan motor field further includes：
S01 detects the voltage of the power grid in real time, and the drop depth of network voltage is calculated by mean-square value method；S02, according to the electricity
The drop depth of net voltage judges the fault condition of power grid.
Specifically, grid voltage sags are most commonly seen electric network faults, rms voltage and volume when will usually fall
The ratio of constant voltage root-mean-square value is defined as drop depth, according to the drop depth of network voltage, judges the failure of the power grid
Situation.
Based on any of the above-described specific embodiment, a kind of fault ride-through of power grid method based on double-fed fan motor field, the step
S1 is further included：When the grid collapses, the by-pass switch in parallel with the secondary of coupling transformer is disconnected.
Specifically, when the grid collapses, by-pass switch disconnects, and the secondary of coupling transformer is accessed the double-fed wind
In the three-phase line that electric field is connected with power grid, series compensator is by coupling transformer into the circuit that wind power plant is connected with power grid
Appropriate offset voltage is injected, ensures the fault traversing operation of double-fed fan motor field.
Based on any of the above-described specific embodiment, Fig. 6 is the breakdown judge and series compensation of the utility model specific embodiment
The control block diagram of device as shown in fig. 6, a kind of fault ride-through of power grid method based on double-fed fan motor field, controls in the step S1
The size that the series compensator injects control voltage to the power grid further comprises：According to dual-feed asynchronous wind power generator
Stator voltage and electric current, obtain stator magnetic linkage positive-sequence component and negative sequence component and transient DC component and；By it is described just
Order components and negative sequence component and transient DC component and adjust respectively compared with corresponding reference value, and by PI
Voltage signal processed；Amplitude limit and SPWM modulation are carried out to the modulated voltage signal, obtains the control of inverter in series compensator
Pulse；The size of inverter output voltage in series compensator described in the control Pulse Width Control, inhibits rotor mistake
Electric current.
Specifically, with reference to figure 6, first, detection dual-feed asynchronous wind power generator stator voltage ugabcAnd electric current isabc, conversion
For the stator voltage u under α β rest framessαβAnd electric current isαβ, according to usαβAnd isαβCalculate the stator magnetic linkage of DFIG, wherein institute
It states stator magnetic linkage and includes positive sequence magnetic linkage component, negative phase-sequence magnetic linkage component and transient DC magnetic linkage component.
Then, after stator magnetic linkage is by forward and reverse coordinate system transformation and filtering, positive-sequence component and negative phase-sequence point are obtained
The sum of amount and transient DC component.
By the positive-sequence component and negative sequence component and transient DC component and respectively compared with corresponding reference value, will
Comparative result carries out PI adjustings and forward and reverse coordinate system transformation respectively, using the sum of the above results as modulated voltage signal ui。
By modulated voltage signal uiIt is modulated by amplitude limit and SPWM, obtains the control pulse of inverter in series compensator.
In the grid collapses, the switch unlock of inverter in series compensator, according to the control pulse control
The size of the inverter output voltage in the series compensator is made, inhibits rotor overcurrent.After fault recovery, motor is controlled
Balance, accelerate unit recover normal operation rapidly.
In the utility model specific embodiment, according to the stator voltage electric current of DFIG to the big of series compensator output voltage
It is small to be controlled, transient state magnetic linkage negative phase-sequence and DC component that DFIG is generated are offset, inhibits DFIG rotors overcurrent and voltage, protection
Power device avoids generator from being subject to the impact of high current and be damaged, improves the stability and safety of double-fed fan motor field
Property.
Based on any of the above-described specific embodiment, Fig. 7 is the dual-feed asynchronous wind power generator of the utility model specific embodiment
The control block diagram of DC voltage, as shown in fig. 7, a kind of fault ride-through of power grid method based on double-fed fan motor field, the step
It is further included before S1：It is adjusted by PI steady with the DC voltage of the multiple dual-feed asynchronous wind power generator of PR controllers realization
Fixed output.
Specifically, the current transformer DC voltage u of dual-feed asynchronous wind power generator is detecteddcWith reference value udc *, by the two
Deviation carries out coordinate conversion after PI is adjusted, and obtains the α axis reference currents i under α β rest framesα *, the current reference of β axis
Value iβ *It is set to 0.Reference current iα *、iβ *With actual current iα、iβMore afterwards modulation voltage u is obtained by PR controllersαAnd uβ, then
The pulse signal of switching tube is obtained by two level PWM generators, controls the rectification side stable DC voltage of current transformer.
Closed-loop control has been carried out to the output of DFIG DC voltages in the utility model specific embodiment, has been added to string
Join the stability that compensator provides energy, improve the compensation precision of series compensator.
Finally, the present processes are only preferable embodiment, are not intended to limit the scope of protection of the utility model.
Within the spirit and principle of the utility model, any modifications, equivalent replacements and improvements are made should be included in this reality
Within new protection domain.
Claims (5)
1. a kind of fault ride-through of power grid system based on double-fed fan motor field, which is characterized in that including：
Multiple dual-feed asynchronous wind power generators, multiple inversion units, an isolating transformer, at least one rectification unit, at least
One series compensator and three coupling transformers；
The isolating transformer is made of a primary side winding and at least one vice-side winding；The series compensator is by inverter
It is formed with wave filter；
Each dual-feed asynchronous wind power generator corresponds to an inversion unit, any dual-feed asynchronous wind power generator it is straight
Flow the input side of the corresponding inversion unit of side connection；The multiple inversion unit outlet side cascade after with the isolating transformer
Primary side winding connects；
Each vice-side winding of isolating transformer corresponds to a rectification unit and a series compensator, the isolation transformation
The input side of the corresponding rectification unit of any vice-side winding connection of device, the corresponding series connection of outlet side connection of any rectification unit
The input side of compensator, the primary side of the corresponding coupling transformer of outlet side connection of any series compensator；
The three-phase line series connection that the secondary of three coupling transformers is connected respectively with the double-fed fan motor field and power grid.
2. system according to claim 1, which is characterized in that further include three by-pass switches, each by-pass switch
A corresponding coupling transformer, any by-pass switch and the secondary of the corresponding coupling transformer are in parallel；Work as electricity
When net state is normal, the by-pass switch is closed.
3. system according to claim 1, which is characterized in that the vice-side winding of the isolating transformer, rectification unit and
The quantity of series compensator is three.
4. system according to claim 1, which is characterized in that the inversion unit is H bridge inverter unit；The rectification list
Member is uncontrollable rectifier unit.
5. system according to claim 1, which is characterized in that the inverter in the series compensator is full-bridge inverting list
Member, the switch in the inverter are IGBT.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107658905A (en) * | 2017-10-31 | 2018-02-02 | 长沙理工大学 | A kind of fault ride-through of power grid system and method based on double-fed fan motor field |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107658905A (en) * | 2017-10-31 | 2018-02-02 | 长沙理工大学 | A kind of fault ride-through of power grid system and method based on double-fed fan motor field |
| CN107658905B (en) * | 2017-10-31 | 2023-08-15 | 长沙理工大学 | Power grid fault ride-through system and method based on doubly-fed wind power plant |
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