CN106253333A - Improve full-power wind power converter power device method of reliability under mild wind - Google Patents
Improve full-power wind power converter power device method of reliability under mild wind Download PDFInfo
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1807—Arrangements for adjusting, eliminating or compensating reactive power in networks using series compensators
- H02J3/1814—Arrangements for adjusting, eliminating or compensating reactive power in networks using series compensators wherein al least one reactive element is actively controlled by a bridge converter, e.g. unified power flow controllers [UPFC]
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E40/30—Reactive power compensation
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Abstract
The invention discloses and a kind of improve full-power wind power converter power device method of reliability under mild wind, under mild wind operating mode, do not affect system output set the most idle in the case of, each net side converter side is increased the frequency tripling reactive current component of a net pressure fundamental frequency, to increase the electric current flowing through net side converter, thus avoid occurring under mild wind operating mode small area analysis ruuning situation；Or when multiple net side converter parallel connection, do not affect system output set the most idle in the case of, between each net side converter, increase a circulation reactive current, increase and flow through the electric current of net side converter, to avoid occurring under mild wind operating mode small area analysis ruuning situation.The present invention improve full-power wind power converter power device method of reliability under mild wind have easy and simple to handle, improve system operation reliability and extend the advantages such as device service life.
Description
Technical field
The invention mainly relates to technical field of wind power, refer in particular to a kind of full-power wind power converter power device that improves at mild wind
The method of lower reliability.
Background technology
Wind-power electricity generation is that current technology is the most ripe, on the largest scaleization exploit condition and the new forms of energy of commercialized development prospect,
The power of Wind turbines constantly increases, and the Wind turbines of go out 5 megawatts of current domestic-developed starts business application." the 13 " phase
Between also will develop 8～10 megawatts of offshore wind farm units.
The Wind turbines and the Wind turbines based on double-fed asynchronous generator that are currently based on synchronous generator respectively have superiority, with
For the present and following mainstream model.Full-power wind power converter is the key equipment of synchronous generator type Wind turbines, generating
The electric energy that machine sends needs all to deliver to electrical network by this current transformer.In addition to supporting synchronous generator, currently also there is part big
The common asynchronous generator that power Wind turbines uses, is also, by full-power wind power converter, electric energy is delivered to electrical network.
The operational reliability of wind electric converter has a strong impact on the generated energy of unit.Along with constantly getting over of Wind turbines capacity
Greatly, and Wind turbines starts large-scale application in Oversea wind power generation, just requires the highest to the operational reliability of equipment, and merit
Rate device (such as IGBT) etc. is again the core devices that current transformer realizes electric current conversion, and its operational reliability is directly connected to current transformer
Functional reliability and service life.
IGBT (igbt) is a kind of voltage-controlled type power electronic devices, has driving power little, conducting pressure
The feature such as reducing, switching loss is little and capacity is big, it has been widely used in locomotive traction, the industry industry such as frequency conversion, wind-power electricity generation.
The trend of Wind turbines development is that single-machine capacity is increasing, and matched wind electric converter capacity is the most increasing, wherein
Large Copacity IGBT is widely applied.But show from commercial Application statistical analysis, the crash rate little Rong to be compared of Large Copacity IGBT
Amount much higher, and it is generally acknowledged IGBT operating current is little under small area analysis, heating loss is low and use should be safer, so
And true really not so, statistical data shows, the converter module based on IGBT crash rate under small area analysis ruuning situation is bright
Aobvious higher than the situation running on big electric current.(high-power in " a kind of high-power converter module at small area analysis under failure analysis "
Semiconductor Converting Technology the 1st phase in 2013) literary composition points out, the IGBT element manipulation of current transformer has two important features under small area analysis:
1) when operating current is less, FWD (Flee Wheel Diode, fly-wheel diode) surge voltage is higher；
The FWD surge voltage that during for being opened by IGBT, diode reverse recovery causes, usual collector current is at its volume
Determine the part of electric current bigger to this surge voltage time in the range of the small area analysis of 1/tens.If this peak voltage surpasses
Crossing reverse bias safety operation area, there is breakdown risk in this IGBT element.
2) there is dead band oscillatory occurences in operating current time less, i.e. in Dead Time, by distribution capacity and current transformer master
Circuit inductance affects, and IGBT terminal voltage will appear from vibration, and terminal voltage vibration in dead band may cause the small pulsewidth of FWD to turn on phenomenon,
And small conducting pulsewidth little to a certain extent time, when may make IGBT element FWD Reverse recovery, peak voltage Vsp is well beyond unit
Part pressure.Although dead band vibrates, such probability is the highest, but under typical products in mass production is applied, such inefficacy will become
Substantially.Although it addition, IGBT element can avoid allowing IGBT element grid by pulse processing circuit under small area analysis working condition
Pole receives narrow pulse signal, but it is possible to the situation that tiny time turns on occurs in actual motion.Visible, current transformer
IGBT element under small area analysis under working condition reliability will decline to a great extent, and greatly reduce the life-span of IGBT.
Wind electric converter based on IGBT power device is back-to-back two three-phase bridge topological form, energy energy bidirectional flow
Dynamic.Current transformer is by being divided into grid side current transformer and generator-side converter inside function and position.The wherein change of grid side
Stream device is generally PWM rectification control mode, and it controls the voltage that target is stable DC side.Under high wind conditions, grid side becomes
The output electric current of stream device is relatively big and smooths, however in the case of little wind or mild wind, because the wind power of Wind turbines conversion is the least, electricity
The current effective value of net side converter is the least, and due to the frequent break-make of device for power switching, the current convergence under small area analysis exists
Zero crossings and frequently change (as shown in Figure 1) through the positive and negative direction of zero crossing, according to analysis situation above, according to current industry
Control method, in the case of mild wind, wind electric converter substantially works at low currents, will be substantially reduced current transformer merit
The reliability of rate device and service life, this phenomenon might as well be referred to as the small area analysis of mild wind operating mode and run phenomenon, as electromotor
Side converter, in the case of typically operating in non-unity power factor due to electromotor, even if under micropower ruuning situation, sends out
Motor side current transformer, due to reactive current to be exported, does not haves long-time small area analysis ruuning situation.
Patent CN103545820B is for double-fed wind energy converter, it is proposed that improving its power device can under mild wind operating mode
By the method for property, its strategy is the technical characterstic used according to double-fed wind energy converter, exports set total nothing in the system that do not affects
In the case of merit requires, come by the method coordinating to increase grid side current transformer and motor side current transformer reactive current or increase micro-
When wind or wind turbine power generation power are the least double-fed wind energy converter flow through electric current, thus avoid small area analysis ruuning situation and be prone to make
The situation of power devices infringement.Different due at operational mode of full-power wind power converter and double-fed wind energy converter, on
State patented method to be difficult to indiscriminately imitate utilization.
Summary of the invention
The technical problem to be solved in the present invention is that the technical problem existed for prior art, and the present invention provides one
Plant easy and simple to handle, raising system operation reliability and the raising full-power wind power converter power device extending device service life
Part is the method for reliability under mild wind.
For solving above-mentioned technical problem, the technical scheme that the present invention proposes is:
A kind of improve full-power wind power converter power device method of reliability under mild wind, under mild wind operating mode,
Do not affect system output set the most idle in the case of, utilize grid-connected voltage device can block frequency tripling for triangle/star connection
The feature of current harmonics, increases the frequency tripling reactive current component of a net pressure fundamental frequency to each net side converter side, with
Increase the electric current flowing through net side converter, thus avoid occurring under mild wind operating mode small area analysis ruuning situation；Or in multiple net sides
During current transformer parallel connection, do not affect system output set the most idle in the case of, between each net side converter increase by one follow
Ring reactive current, increases and flows through the electric current of net side converter, to avoid occurring under mild wind operating mode small area analysis ruuning situation.
Further improvement as technique scheme:
When two net side converter parallel connections, one of them net side converter sends superposition idle component, and another nets side
Current transformer absorbs the idle component of equivalent, so that idle component exchanges to increase electric current between two net side converters, and ensures
Externally output is total idle constant.
The Rule of judgment of mild wind operating mode is: the watt current of net side converter is less than predetermined threshold value.
Mode to one 2 harmonic of referenced reactive current superposition of net side converter in dq synchronous rotating frame
Realize exporting 3 frequency multiplication reactive currents.
In the case of the unsteady flow parallel connection of multiple net sides, the reactive current component that each net side converter increases is identical or not phase
With.
Described full-power wind power converter is made up of IGBT or IGCT or IEGT.
Compared with prior art, it is an advantage of the current invention that:
The present invention improves full-power wind power converter power device method of reliability under mild wind, has not both affected system
In the case of fixed output is the most idle, to each net side converter, the method for the integer time reactive current by increasing by 3 is avoided micro-
Small area analysis ruuning situation in the case of wind；Or when multiple net side converter parallel connection, increase the idle electricity flowed each other
Stream, thus improve the power device operational reliability of full-power wind power converter and extend life of product.
Accompanying drawing explanation
Fig. 1 is the output waveform figure of the off line side converter of mild wind operating mode in prior art.
Fig. 2 is the parallel-connection structure schematic diagram of multiple net side converters of the present invention.
Fig. 3 is the single net side converter structural representation of the present invention.
Fig. 4 is the full-power wind power converter application schematic diagram of the present invention.
Fig. 5 is that the full-power wind power converter physical quantity of the present invention is with reference to positive direction schematic diagram.
Fig. 6 is the net side converter control principle drawing of the present invention.
Fig. 7 is the net side converter control principle drawing of parallel-connection structure of the present invention.
Net the idle indicator current in side when Fig. 8 is parallel-connection structure of the present invention and control logic chart.
Fig. 9 is the net side converter control principle drawing of single convertor cabinet of the present invention.
Figure 10 is that the idle indicator current of grid side of this bright single convertor cabinet controls logic chart.
Figure 11 is the simulation waveform that the present invention increases frequency tripling reactive current under mild wind operating mode.
Detailed description of the invention
Below in conjunction with Figure of description and specific embodiment, the invention will be further described.
If Fig. 2 is to shown in 11, the present embodiment improve full-power wind power converter power device reliability under mild wind
Method, detailed process is: under mild wind operating mode, do not affect system output set the most idle in the case of, utilize grid-connected voltage
Device is the feature that triangle/star connection can block frequency tripling current harmonics, and each net side converter side increases a net pressure
The frequency tripling reactive current component of fundamental frequency, to increase the electric current flowing through net side converter, thus avoids going out under mild wind operating mode
Existing small area analysis ruuning situation；Or when multiple net side converter parallel connection, export the most idle set situation in the system that do not affects
Under, between each net side converter, increase a circulation reactive current, increase and flow through the electric current of net side converter, to avoid mild wind
Small area analysis ruuning situation occurs under operating mode.
The present invention improves full-power wind power converter power device method of reliability under mild wind, has not both affected system
In the case of fixed output is the most idle, to each net side converter, the integer time reactive current by the 3 of increase net pressure fundamental frequency
Method avoids the small area analysis ruuning situation in the case of mild wind；Or when multiple net side converter parallel connection, increase mutually it
Between flowing reactive current, thus improve full-power wind power converter power device operational reliability and extend life of product.
In the present embodiment, the Rule of judgment of mild wind operating mode is: the watt current of net side converter is less than predetermined threshold value.
Hereinafter the principle of the present invention is further analyzed and illustrates:
Full-power wind power converter is mainly used in variable speed constant frequency synchronous generator or common asynchronous generating type wind-power electricity generation
System, as shown in Figure 4, is made up of back-to-back two four quadrant convertors inside full-power wind power converter, connects electromotor
The current transformer of stator is commonly referred to as motor side current transformer (SSC), and the current transformer connecting electrical network is commonly referred to as grid side current transformer
(GSC).The function of grid side current transformer is mainly used in the voltage of stable DC side, it addition, can according to grid dispatching center needs
Control as absorbing to electrical network or sending idle.(i.e. torque current divides the watt current of motor side current transformer control generator unit stator
Amount) and reactive current (i.e. excitation current component).
For the control of net side converter, current reference positive direction as shown in Figure 5, by under dq synchronous rotating frame
D axle is oriented on line voltage synthetic vector direction, and the constant amplitude in three-phase static coordinate system to synchronous rotating frame converts feelings
Under condition, the active-power P of grid side current transformer can be obtainedgAnd reactive power QgFor:
Wherein, udFor the d axle component of electrical network phase voltage, idReal component for grid side line current.iqFor electrical network side line electricity
The idle component of stream.
Work as QgDuring ＞ 0, represent that current transformer, externally in perception, absorbs idle from electrical network,
Work as Qg< when 0, represent that current transformer, externally in capacitive, provides idle to electrical network.
And for full-power wind power converter, the meritorious of motor side current transformer is equal with the meritorious of grid side current transformer
, i.e.
Pg=Ps (2)
From formula (1), the linear pass that the idle component of net side converter is directly proportional to the reactive current of net side converter
System.
The control of net side converter is usually taken the double-closed-loop control method of outer voltage and current inner loop, as shown in Figure 6.
Wherein outer voltage control is:
Wherein KpProportionality coefficient, KiFor integral coefficient, udcFor DC side virtual voltage, udc *For DC side target control electricity
Pressure.
The control of outer voltage is for stable DC side voltage, and its output instructs as the watt current of current inner loop
Value.And the general i of idle command value of current inner loopq' generally zero, even if the power factor of net side converter is approximately 1, only
In the case of for stable line voltage, dispatching of power netwoks company Qiang Zhiyaoqius that Wind turbines provides reactive power support to electrical network, this nothing
Merit instructs idle amount Q that will transmit by complete machine control systemg *Or reactive current amount iq *Require value, the blower fan run at present
Grid side current transformer is essentially all and is operated in iq *It it is the situation of 0.
Wherein current inner loop control is
Wherein, KpPAnd KpQFor proportionality coefficient, KiPAnd KiQFor integral coefficient, ω1For electrical network angular frequency, idFor net side unsteady flow
The actual watt current of device, iqFor the actual reactive current of net side converter, id *For net side converter watt current command value, iq *For net
Side converter referenced reactive current value.
The output of current inner loop is as the output control instruction voltage v of current transformerd' and vq′。
For the control of motor side current transformer, use vector control method equally, it is achieved meritorious and idle uneoupled control.
For common asynchronous wind driven generator, due to it be no matter work under mild wind or high wind conditions all can need to absorb idle, nothing
Merit electric current needs to be provided by motor side current transformer, therefore motor side current transformer does not haves small area analysis ruuning situation.And for synchronizing
The control of wind-driven generator, common control method is to control to be zero, Stator energization current in order to avoid electricity little under mild wind
Stream ruuning situation, can artificially increase the reactive current of pusher side current transformer, make synchronous generator be operated in slight weak magnetic or increasing magnetic shape
State.Therefore can avoid small area analysis ruuning situation easily for pusher side current transformer, therefore the present invention emphasis is placed upon electricity
How net side converter avoids small area analysis ruuning situation aspect.
For two kinds of different structure forms of full-power wind power converter, provide its grid side current transformer separately below micro-
The different control strategies that small area analysis runs are avoided in the case of wind.
As in figure 2 it is shown, for the system structure of two sub-current transformers parallel connections, the grid side unsteady flow under dq synchronous rotating frame
Device referenced reactive current sets in the following manner:
Shown in improvement part as shown in Fig. 7 dashed box, grid side current transformer control principle drawing takes its neutron current transformer 1#'s
Idle instruction current is:
The idle instruction current then taking another sub-current transformer 2# is:
Wherein, Qg *Idle instruction when sending out idle for dispatching of power netwoks requirement Wind turbines.iqwFor avoid small area analysis run and
The reactive current of superposition (being DC component under synchronous rotary index system), so ensures idle of superposition between sub-current transformer
Exchange, sub-current transformer send superposition idle while, another sub-current transformer absorbs the idle of equivalent.And net side converter
1# output current amplitude is:
Another net side converter 2# output current amplitude is:
In order to avoid two sub-current transformer grid side small area analysis run, if output current amplitude I to be reachedw, i.e. need
Meet I simultaneouslym1≥IwAnd Im2≥Iw, id' for the output of voltage control loop pi regulator, it controls the defeated of ring for internal current
Enter, when electric current loop is effectively controlled, it is believed that the active component of current size of grid side current transformer is exactly id'.When | id'
|≥IwTime, it is clear that meet condition, then take iqw=0；And work as | id'|<IwAndDesirable iqw=0.And | id'|<Iw
AndDesirableAbove-mentioned processing method can be with such as the control logical flow chart of Fig. 8
Describe.
Along with the power capacity of full-power wind power converter constantly increases, whole current transformer can be by two or more
The sub-current transformer composition of low capacity, for more than three sub-current transformer in the case ofs of being formed in parallel, can take above-mentioned similar
Method realizes, superposition idle only between each sub-current transformer flowing and do not affect system external output the most idle and always have
Merit, avoids small area analysis to run simultaneously and improves power device reliability and the effect in service life in the case of reaching mild wind.
As it is shown on figure 3, be different from many cabinets parallel-connection structure, single convertor cabinet is guaranteeing that not affecting the set total output of system gains merit
In the case of idle requirement, its net side converter cannot superposition one in dq synchronous coordinate system the most simply
The method of individual reactive current avoids the small area analysis ruuning situation in the case of mild wind.But, owing to every Fans is by grid-connected change
Depressor is grid-connected, and what current transformer grid side connected is the low-pressure side of grid-connected transformator, and its winding is usually star connection, and grid-connected change
It is delta connection that depressor connects the high-pressure side of bulk power grid, and such connection can block integer (the i.e. frequency delivering on high-tension side 3
Rate is net pressure the 3 of fundamental frequency, 6,9 .... times) harmonic current.The present invention utilizes this technology spy of grid-connected transformator dexterously
Point, allows full-power wind power converter the most suitably increase (under rest frame) net pressure base when mild wind small-power situation
3 frequency multiplication reactive current components of wave frequency, then the consequent idle high-pressure side that will not be sent to grid-connected transformator, also
I.e. do not interfere with blower fan and mail to the set idle requirement of electrical network.Therefore, for single cabinet wind electric converter, what this patent proposed avoids
Small area analysis runs and improves (dashed box institute shown in a method of device for power switching operational reliability control figure as shown in Figure 9
The improvement part shown).
Before the integer frequency idle component of superposition 3, the total current amplitude of net side output is
If Im≥Iw, it is no need for superposition idle component, i.e. takes iq +=0, otherwise, desirable q+=Iwsin[(3k-1)ω1T], wherein k is the integer more than 0.Switching frequency in view of high-power full power convertor will not be the highest, the most desirable k=
1, it is achieved method be instruction superposition one 2 harmonics idle to former direct current in dq synchronous rotating frame, so net side
The actual of output is exactly 3 frequency multiplication reactive currents.Above-mentioned simple control logic can be retouched with logic control flow process figure shown in following 10
State:
As shown in figure 11, give when mild wind grid side in the case of small-power to increase by 3 frequencys multiplication (frequency is net pressure first-harmonic
3 times of frequency) simulation waveform of output current of converter contrast before and after reactive current, first half is the waveform not increased, after
Half portion is the waveform after increasing, it is seen then that after increasing by 3 frequency multiplication reactive currents, the electric current flowing through current transformer device for power switching is frequent
The number of times of zero passage considerably reduces, and operational reliability and the service life of device for power switching will be enhanced.
Certainly, the control improved method for non-parallel-connection structure current transformer given here can be applied equally to and connect
The situation of structure current transformer.That is for the current transformer of parallel-connection structure, every sub-current transformer net side control can be as being previously noted
Non-parallel-connection structure situation the same, can 3 frequency multiplication reactive current components that each superposition is identical or different to reach to avoid little electricity
Stream runs the purpose of phenomenon.Additionally to the motor side current transformer in parallel-connection structure or non-parallel-connection structure full-power wind power converter,
Above-mentioned similar method can also be taked, avoid little electricity by increasing the fundamental reactive current of motor side current transformer internal flow
Stream ruuning situation, and do not affect the direct torque of electromotor.
In the present embodiment, the method for the present invention is applicable to power switch based on the various voltage such as IGBT or IGCT or IEGT
All full-power wind power converters that device is constituted.And for motor side current transformer, above-mentioned similar control side can be taked equally
Method, can increase the reactive current of motor side current transformer internal flow to avoid small area analysis ruuning situation, thus not affect generating
The direct torque of machine.
The method of the present invention need not newly added equipment, utilizes the feature of full-power wind power converter self and grid-connected transformator
Technical characterstic, it is only necessary to control strategy is improved the little electricity of the device for power switching that just can avoid full-power wind power converter
Stream runs bad working environments, is favorably improved power device service life and strengthens the operational reliability of current transformer；And operate letter
Just, the total meritorious and idle size of system external output is not interfered with.
Below being only the preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-described embodiment,
All technical schemes belonged under thinking of the present invention belong to protection scope of the present invention.It should be pointed out that, for the art
For those of ordinary skill, some improvements and modifications without departing from the principles of the present invention, should be regarded as the protection of the present invention
Scope.
Claims (6)
1. one kind is improved full-power wind power converter power device method of reliability under mild wind, it is characterised in that at mild wind
Under operating mode, do not affect system output set the most idle in the case of, to each net side converter side increase by one net pressure first-harmonic
The frequency tripling reactive current component of frequency, to increase the electric current flowing through each net side converter, thus avoids appearance under mild wind operating mode
Small area analysis ruuning situation；Or when multiple net side converter parallel connection, do not affect system output set the most idle in the case of,
Between each net side converter, increase a circulation reactive current, increase and flow through the electric current of net side converter, to avoid mild wind work
Small area analysis ruuning situation occurs under condition.
Raising full-power wind power converter power device method of reliability under mild wind the most according to claim 1, its
Being characterised by, when two net side converter parallel connections, one of them net side converter sends superposition idle component, and another nets side
Current transformer absorbs the idle component of equivalent, so that idle component exchanges to increase electric current between two net side converters, and ensures
Externally output is total idle constant.
Raising full-power wind power converter power device method of reliability under mild wind the most according to claim 1 and 2,
It is characterized in that, the Rule of judgment of mild wind operating mode is: the watt current of net side converter is less than predetermined threshold value.
Raising full-power wind power converter power device method of reliability under mild wind the most according to claim 1 and 2,
It is characterized in that, realize the mode of one 2 harmonic of referenced reactive current superposition of net side converter exporting 3 frequencys multiplication without
Merit electric current.
Raising full-power wind power converter power device method of reliability under mild wind the most according to claim 1 and 2,
It is characterized in that, in the case of the unsteady flow parallel connection of multiple net sides, each net side converter increase reactive current component identical or
Differ.
Raising full-power wind power converter power device method of reliability under mild wind the most according to claim 1 and 2,
It is characterized in that, described full-power wind power converter is made up of IGBT or IGCT or IEGT.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108268730A (en) * | 2018-01-23 | 2018-07-10 | 北京航空航天大学 | A kind of TBE control figure Optimized System Design methods degenerated towards product reliability |
| CN116207777A (en) * | 2022-12-22 | 2023-06-02 | 中国华能集团清洁能源技术研究院有限公司 | Grid-connected stability improving method for full-power converter wind turbine generator |
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| CN108268730A (en) * | 2018-01-23 | 2018-07-10 | 北京航空航天大学 | A kind of TBE control figure Optimized System Design methods degenerated towards product reliability |
| CN108268730B (en) * | 2018-01-23 | 2021-06-04 | 北京航空航天大学 | TBE control chart system optimization design method for product reliability degradation |
| CN116207777A (en) * | 2022-12-22 | 2023-06-02 | 中国华能集团清洁能源技术研究院有限公司 | Grid-connected stability improving method for full-power converter wind turbine generator |
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| CN106253333B (en) | 2019-08-09 |
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