CN109638884B - A kind of DFIG low-voltage ride-through method based on SFCL and superconduction DVR Collaborative Control - Google Patents
A kind of DFIG low-voltage ride-through method based on SFCL and superconduction DVR Collaborative Control Download PDFInfo
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- CN109638884B CN109638884B CN201811641856.1A CN201811641856A CN109638884B CN 109638884 B CN109638884 B CN 109638884B CN 201811641856 A CN201811641856 A CN 201811641856A CN 109638884 B CN109638884 B CN 109638884B
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- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000011084 recovery Methods 0.000 claims description 6
- 230000003111 delayed effect Effects 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims description 4
- 230000007423 decrease Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 2
- 230000003247 decreasing effect Effects 0.000 abstract description 2
- 230000001737 promoting effect Effects 0.000 abstract description 2
- 238000011217 control strategy Methods 0.000 description 4
- 238000004146 energy storage Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 230000005764 inhibitory process Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
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- 230000000694 effects Effects 0.000 description 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
- 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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
-
- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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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
-
- 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
- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
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- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a kind of DFIG low-voltage ride-through methods based on SFCL and superconduction DVR Collaborative Control of double-fed Fan Equipment technical field; the system for establishing the DFIG low-voltage ride-through method based on SFCL and superconduction DVR Collaborative Control; when network voltage temporarily drops; DFIG detects voltage dip amplitude and rotor current amplitude; according to the range of voltage dip amplitude and rotor current amplitude; DFIG works in superconductive failure current limiter protected mode, superconduction DVR voltage compensation mode, superconductive failure current limiter-superconduction DVR coordinating protection mode under the action of time delay module respectively.The present invention is using superconductive failure current limiter and superconduction DVR to the different role characteristic for promoting DFIG low voltage ride-through capability, by the switching operating status for coordinating two kinds of devices, greatly improve the degree of reliability of DFIG low voltage crossing, and relative to single superconducting device independent role situation, the performance requirement of every kind of superconducting device is decreased, to extend the service life of whole device.
Description
Technical field
The present invention relates to double-fed Fan Equipment technical fields, more particularly to one kind based on SFCL and superconduction DVR collaboration control
The DFIG low-voltage ride-through method of system.
Background technique
With the continuous development of wind power technology, the scale and capacity of wind power plant are increasing, and wind power plant is in entire power train
Shared power generation ratio also persistently rises in system, thus its influence to system is also more and more significant.When system causes because of failure
When voltage dip, double-fed induction wind driven generator (doubly-fed induction generator, DFIG) output power without
Method is delivered to power grid, causes energy that can only be stored in inside DFIG.It shakes at this point, strong electro-magnetic transient will occur inside DFIG
Swing, stator and rotor current will sharply increase, DC voltage also can change dramatically, this will cause DFIG itself serious
Harm.And previous DFIG capacity it is smaller when, in order to guarantee itself safety, DFIG would generally be detached from power grid.But as wind-force is sent out
The continuous increase of capacity motor is if still guaranteeing inherently safe by the way of off-grid when system jam
The stability of system will will receive strong influence.Therefore, when temporarily drop occurs for network voltage, the low electricity of DFIG should be can be realized
It presses to wear more, guarantees DIFG without departing from power grid.
The realization of low voltage crossing currently mainly has and improves two methods of control strategy and increase hardware device.Improve control
The current control strategy having based on stator voltage dynamic compensation of system strategy improves vector control strategy and based on H ∞ and μ analysis
Novel robust control device method etc., but this method is limited by excitation converter, it may in the case where voltage seriously falls
It cannot achieve and pass through.The method for increasing hardware device mainly includes rotor-side parallel connection Crowbar circuit, dc-link capacitance parallel connection
Energy storage device, grid side series transformer, stator side series resistor array etc..The effect for increasing hardware device is obvious, can not only
Realize that low voltage crossing can also protect equipment simultaneously.
Dynamic electric voltage recovery device (Dynamic Voltage Restorer, DVR) is a kind of based on modern power electronic skill
The custom power equipment of art, the problems such as can effectively solve voltage dip and voltage swell.DVR is mainly by energy-storage units, inversion list
The modules such as member, filter unit and control unit composition, is usually serially connected in power grid, is equivalent to the electricity of an amplitude and phase-adjustable
Potential source.Wherein, superconduction DVR has the advantages that quick offset voltage using super conductive magnetic storage energy as DC energy storage device.
Fault current limiter be it is a kind of for fault restriction when short circuit current electrical equipment.Superconductive failure current limiter
(superconducting fault current limiter, SFCL) is one made using the zero resistance nature of superconductor
Kind fault current limiter has fairly obvious advantage relative to conventional fault current limiter.Wherein, resistive superconducting fault current limliting
Device does not need additional fault detection means since its small volume, structure and principle are simple, has self-test and self-starting
Ability, be widely used.
Summary of the invention
It is an object of the invention to the advantages using superconductive failure current limiter and superconduction DVR, improve DFIG low voltage crossing
Reliability, a kind of DFIG low-voltage ride-through method based on SFCL and superconduction DVR Collaborative Control is provided.
In order to achieve the above-mentioned object of the invention, the present invention provides following technical schemes:
A kind of DFIG low-voltage ride-through method based on SFCL and superconduction DVR Collaborative Control, comprising the following steps:
S1: the system for establishing the DFIG low-voltage ride-through method based on SFCL and superconduction DVR Collaborative Control, system include
DFIG, superconduction DVR, SFCL and its by-pass switch K, DFIG include rotor-side converter and stator side converter, the one end SFCL with
DFIG connection, the other end are connect with rotor-side converter, and by-pass switch K is connected to the both ends SFCL, and superconduction DVR turns positioned at stator side
Parallel operation side, superconduction DVR are connect via three single-phase series transformers with power grid；
S2: when network voltage bust, DFIG detects voltage dip amplitude and rotor current amplitude, according to voltage dip width
The range of value and rotor current amplitude, DFIG work in superconductive failure current limiter protection mould under the action of time delay module respectively
Formula, superconduction DVR voltage compensation mode or superconductive failure current limiter-superconduction DVR coordinating protection mode.
According to the range of voltage dip amplitude and rotor current amplitude, DFIG works respectively under the action of time delay module
In superconductive failure current limiter protected mode, superconduction DVR voltage compensation mode or superconductive failure current limiter-superconduction DVR coordinating protection
Mode, mode handover procedure are as follows:
When rotor current amplitude is greater than current amplitude setting value, rotor-side transducer senses to overcurrent cause SFCL
It quenches, DFIG is automatically into superconductive failure current limiter protected mode, and only SFCL puts into operation；
When rotor current amplitude be greater than current amplitude setting value, while voltage dip amplitude be greater than voltage magnitude setting value
When, by-path turn-on signal is generated, by-path turn-on signal is set to 1, and by-path turn-on signal is sent to time delay module, keeps delay shape
State, by-pass switch Delayed conducting, until superconduction DVR starts completely, at the end of delay, by-pass switch is connected immediately, and DFIG is by surpassing
It leads fault current limiter protected mode and is switched to superconduction DVR voltage compensation mode, only superconduction DVR puts into operation；
When rotor current amplitude be greater than current amplitude setting value, while voltage dip amplitude be less than voltage magnitude setting value
When, by-path turn-on signal is generated, by-path turn-on signal is set to 0, and by-path turn-on signal is sent to time delay module, keeps delay shape
State, by-pass switch time delayed turn-off, until superconduction DVR starts completely, at the end of delay, by-pass switch is immediately turned off, and DFIG is by surpassing
It leads fault current limiter protected mode and is switched to superconductive failure current limiter-superconduction DVR coordinating protection mode, SFCL and superconduction DVR are equal
It puts into operation.
Setting parameter is the resistance value R of SFCL, the capacity P of superconduction DVR, superconduction DVR superconducting magnet inductance value L, and be delayed mould
The delay duration t of blockdelay。
The calculation formula of the capacity P of superconduction DVR are as follows:
PDVR=(1-Usag)Prate
Wherein, PrateIt is the rated active power that power grid is injected when Wind turbines operate normally, UsagIt is voltage dip width
Value.
The calculation formula of superconduction DVR superconducting magnet inductance value L are as follows:
Wherein, PrateIt is the rated active power that power grid is injected when Wind turbines operate normally, UsagIt is voltage dip width
Value, iscFor the superconducting coil initial launch electric current of superconduction dynamic electric voltage recovery device DVR, tfaultIt is the voltage dip duration.
The delay duration t of time delay moduledelayThe condition for needing to meet is tdelay> tres, wherein tresIt is superconduction dynamic electric
The starting time of voltage recovery device DVR.
The resistance value R of SFCL is the intersection point abscissa that rotor-side converter overcurrent inhibits target and relation curve, relationship
Curve refers to the relation curve I of rotor-side converter overcurrent amplitude Yu SFCL steadying resistancerp=f (RSFCL)。
Compared with prior art, beneficial effects of the present invention:
Using superconductive failure current limiter and superconduction DVR to the different role characteristic for promoting DFIG low voltage ride-through capability, lead to
The switching operating status for coordinating two kinds of devices is crossed, greatly improves the degree of reliability for realizing DFIG low voltage crossing, and opposite
In single superconducting device independent role situation, the performance requirement of every kind of superconducting device is decreased, to extend whole device
Service life.
Detailed description of the invention:
Fig. 1 is that the system structure of the DFIG low-voltage ride-through method the present invention is based on SFCL and superconduction DVR Collaborative Control is shown
It is intended to；
Fig. 2 is a kind of DFIG low-voltage ride-through method flow chart based on SFCL and superconduction DVR Collaborative Control of the present invention；
Fig. 3 is that a kind of parameter of the DFIG low-voltage ride-through method based on SFCL and superconduction DVR Collaborative Control of the present invention is whole
Determine principle；
Fig. 4 is the rotor overcurrent I in the embodiment of the present invention 1rpWith the superconductive failure current limiter steadying resistance RSFCL's
Relation curve.
Specific embodiment
Below with reference to test example and specific embodiment, the present invention is described in further detail.But this should not be understood
It is all that this is belonged to based on the technology that the content of present invention is realized for the scope of the above subject matter of the present invention is limited to the following embodiments
The range of invention.
Embodiment 1
A kind of device of the DFIG low-voltage ride-through method based on SFCL and superconduction DVR Collaborative Control is as shown in Figure 1, include
DFIG, superconduction DVR, SFCL and its by-pass switch K, SFCL are serially connected with DFIG rotor-side A, B, C phase and rotor-side converter respectively
It exchanges between side A, B, C phase, by-pass switch K is parallel to the both ends of SFCL, and superconduction DVR device is via three single-phase series transformers
It is serially connected in grid entry point bus A, B, C phase respectively.
Cooperative control method mainly realizes the selection of DFIG low voltage crossing scheme protected mode during electric network fault, selection
Process is as shown in Figure 2.The process of protected mode switching is as follows:
(1) after electric network fault generation, superconduction DVR starts to start after detecting voltage dip, but there are one to start
Journey.During this period, DFIG rotor-side will induce overcurrent Irp.After detecting that rotor overcurrent meets Irp > 1.1pu, turn
Sub- overcurrent quenches the automatic superconductive failure current limiter that causes to automatically into " superconductive failure current limiter protected mode " (mode
1).Meanwhile according to the size of temporary decline Usag, one is sent via time delay module to the by-pass switch of superconductive failure current limiter
Delay cut-off signal.
(2) when detecting that voltage dip amplitude Usag meets Usag > 0.5pu, a Continuity signal K is generatedContinuity signal=1
And being sent to delay duration is tdelayTime delay module.After the superconduction DVR starts completely, time delay module delay knot
Beam, by-pass switch is closed at this time, and SFCL is bypassed and out of service, is realized and is switched to " superconduction DVR voltage compensation mould by mode 1
Formula " (mode 2).
(3) when detecting that voltage dip amplitude Usag meets Usag < 0.5pu, a cut-off signals K is generatedContinuity signal=0
And it is sent to delay tdelayTime delay module.After the superconduction DVR starts completely, time delay module delay terminates, at this time
By-pass switch disconnects, and SFCL holding puts into operation, realizes and switches to " superconductive failure current limiter-superconduction DVR collaboration guarantor by mode 1
Shield mode " (mode 3).
The parameter tuning principle of the DFIG low-voltage ride-through method of Collaborative Control as shown in figure 3, superconductive failure current limiter and
Superconduction DVR parameter tuning calculating process is as follows:
(1) superconduction DVR is adjusted according to principle horizontal before energy offset voltage to failure when temporary decline is 0.5pu is met
Capacity P.Dynamic electric voltage recovery device capacity is chosen as follows:
PDVR=(1-Usag)Prate (1)
In formula: PrateIt is the rated active power that power grid is injected when Wind turbines operate normally, UsagIt is voltage dip width
Value.
(2) the superconducting coil inductance adjusting of superconduction DVR.The energy W of superconducting coil storage is as follows:
In formula: L is superconducting coil inductance；iscFor superconducting coil initial launch electric current, value needs to meet in grid entry point electricity
Pressure remains to compensate power needed for providing in the case of temporarily dropping most serious, that is, meets:
Udcnisc=Prate (3)
In formula: UdcnIt is the initial DC voltage of voltage source inverter.
It therefore, is t for the durationfaultVoltage dip, energy storage capacity be W superconducting coil output power are as follows:
Ignore superconduction DVR internal loss, superconducting coil output power is equal to superconduction DVR capacity, it may be assumed that
PDVR=Psc (5)
Therefore, in conjunction with formula (1) to formula (5), superconducting coil inductance is chosen as follows:
(3) superconductive failure current limiter steadying resistance is adjusted according to rotor overcurrent peaks demand.The rotor of failure DFIG
Overcurrent is represented by
In formula: ω s and ω s are respectively angular stator frequency and rotor angular frequency；Vrm is DFIG rotor-side converter (RSC)
Maximum allowable output voltage of adjuster；ks=Lm/LsFor rotor yoke factor；Rs, RrRespectively stator resistance and rotor resistance；S is slip
Rate；,ir(0-) is the rotor current before failure.
It chooses rotor overcurrent and is no more than 2pu as electric current inhibition target, draw actual rotor overcurrent according to formula (7)
The relation curve I of Irp and the superconductive failure current limiter steadying resistance RSFCLrp=f (RSFCL), then rotor overcurrent inhibits mesh
The abscissa of mark and the relation curve intersection point is the setting valve R of the superconductive failure current limiter steadying resistanceSFCL。
(4) start time t according to the superconduction DVRresThe superconductive failure current limiter by-pass switch time delay module is prolonged
When tdelayIt is adjusted.According to coordination control strategy described in step A, superconductive failure current limiter needs are opened in the superconduction DVR
Investment limitation DFIG rotor overcurrent is kept during dynamic, so the time delay module time of signal is cut-off to postpone by-pass switch
tdelayMeet:
tdelay> tres (8)
Fig. 4 provides the pass of DFIG the rotor overcurrent peak value and superconductive failure current limiter resistance value under a kind of example situation
It is curve.Relationship according to Fig.4, in order to inhibit rotor overcurrent peak value in 2pu, superconductive failure current limiter resistance value should
Adjusting is 0.5 Ω.If rotor overcurrent peak value inhibits target IrthIt changing, the dotted line in Fig. 4 will move up and down therewith, it
It is afterwards new superconductive failure current limiter resistance setting valve with the new intersection point of relation curve Irp.In addition, Fig. 4 is also indicated that, if electric current
Rotor overcurrent peak value inhibition level is bigger, then superconductive failure current limiter resistance setting valve is bigger.
Claims (6)
1. a kind of DFIG low-voltage ride-through method based on SFCL and superconduction DVR Collaborative Control, which is characterized in that including following step
It is rapid:
S1: establish the DFIG low-voltage ride-through method based on SFCL and superconduction DVR Collaborative Control system, system include DFIG,
Superconduction DVR, SFCL and its by-pass switch K, the DFIG include rotor-side converter and stator side converter, described one end SFCL
It is connect with the DFIG, the other end is connect with the rotor-side converter, and the by-pass switch K is connected to the both ends SFCL, described
Superconduction DVR is located at stator side converter side, and the superconduction DVR is connect via three single-phase series transformers with power grid；
The SFCL is resistor-type SFCL；
S2: when the network voltage bust, the DFIG detection voltage dip amplitude and rotor current amplitude, according to the electricity
The range of temporary decline and rotor current amplitude is pressed, the DFIG works in super-conductive fault under the action of time delay module respectively
Current limiter protected mode, superconduction DVR voltage compensation mode or superconductive failure current limiter-superconduction DVR coordinating protection mode；
According to the range of the voltage dip amplitude and rotor current amplitude, the DFIG is under the action of time delay module, respectively
Work in superconductive failure current limiter protected mode, superconduction DVR voltage compensation mode or superconductive failure current limiter-superconduction DVR collaboration
Protected mode, mode handover procedure are as follows:
When the rotor current amplitude is greater than current amplitude setting value, the rotor-side transducer senses to overcurrent cause
The SFCL is quenched, and the DFIG is automatically into superconductive failure current limiter protected mode, and only SFCL puts into operation；
When the rotor current amplitude be greater than the current amplitude setting value, while the voltage dip amplitude be greater than voltage magnitude
When setting value, by-path turn-on signal is generated, the by-path turn-on signal is set to 1, and the by-path turn-on signal is sent to delay mould
Block, holding delay state, by-pass switch Delayed conducting, until the superconduction DVR starts completely, at the end of delay, by-pass switch
It is connected immediately, the DFIG is switched to superconduction DVR voltage compensation mode, only superconduction by the superconductive failure current limiter protected mode
DVR puts into operation；
When the rotor current amplitude be greater than the current amplitude setting value, while voltage dip amplitude be less than the voltage magnitude
When setting value, by-path turn-on signal is generated, the by-path turn-on signal is set to 0, and the by-path turn-on signal is sent to delay mould
Block, holding delay state, by-pass switch time delayed turn-off, until the superconduction DVR starts completely, at the end of delay, by-pass switch
It immediately turns off, the DFIG is switched to superconductive failure current limiter-superconduction DVR by the superconductive failure current limiter protected mode and cooperates with
Protected mode, SFCL and superconduction DVR put into operation.
2. a kind of DFIG low-voltage ride-through method based on SFCL and superconduction DVR Collaborative Control as described in claim 1, special
Sign is that setting parameter is the resistance value R of the SFCL, the capacity P of the superconduction DVR, the superconduction DVR superconducting magnet inductance
Value L, the delay duration t of the time delay moduledelay。
3. a kind of DFIG low-voltage ride-through method based on SFCL and superconduction DVR Collaborative Control as claimed in claim 2, special
Sign is, the calculation formula of the capacity P of the superconduction DVR are as follows:
PDVR=(1-Usag)Prate
Wherein, PrateIt is the rated active power that power grid is injected when Wind turbines operate normally, UsagIt is the voltage dip amplitude.
4. a kind of DFIG low-voltage ride-through method based on SFCL and superconduction DVR Collaborative Control as claimed in claim 2, special
Sign is, the calculation formula of the superconduction DVR superconducting magnet inductance value L are as follows:
Wherein, PrateIt is the rated active power that power grid is injected when Wind turbines operate normally, UsagIt is the voltage dip amplitude,
iscFor the superconducting coil initial launch electric current of superconduction dynamic electric voltage recovery device DVR, tfaultIt is the voltage dip duration.
5. a kind of DFIG low-voltage ride-through method based on SFCL and superconduction DVR Collaborative Control as claimed in claim 2, special
Sign is, the delay duration t of the time delay moduledelayThe condition for needing to meet is tdelay>tres, wherein tresIt is the superconduction
The starting time of dynamic electric voltage recovery device DVR.
6. a kind of DFIG low-voltage ride-through method based on SFCL and superconduction DVR Collaborative Control as claimed in claim 2, special
Sign is that the resistance value R of the SFCL is the horizontal seat of intersection point that the rotor-side converter overcurrent inhibits target and relation curve
Mark, the relation curve refer to the relation curve I of the rotor-side converter overcurrent amplitude Yu the SFCL steadying resistancerp=
f(RSFCL)。
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| CN110808617A (en) * | 2019-11-14 | 2020-02-18 | 武汉大学 | System and method for improving VSG low-voltage ride-through capability based on magnetic flux coupling type SFCL |
| CN113746140B (en) * | 2021-11-08 | 2022-02-11 | 四川大学 | Doubly-fed wind turbine fault ride-through method under continuous disturbance of high-voltage direct-current transmission |
| CN116937684B (en) * | 2023-07-24 | 2024-02-02 | 南通大学 | Low-voltage ride through method for doubly-fed wind turbine generator |
| CN116961102B (en) * | 2023-07-27 | 2024-01-30 | 南通大学 | Control method of variable-impedance fault current limiter |
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