CN106253333B - The method for improving full-power wind power converter power device reliability under gentle breeze - Google Patents
The method for improving full-power wind power converter power device reliability under gentle breeze 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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- 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
- Y02E40/30—Reactive power compensation
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Abstract
The invention discloses a kind of methods for improving full-power wind power converter power device reliability under gentle breeze, under gentle breeze operating condition, do not influence system output it is set total idle in the case where, increase each grid-side converter side the frequency tripling reactive current component of a network pressure fundamental frequency, to increase the electric current for flowing through grid-side converter, to avoid occurring low current operating condition under gentle breeze operating condition；Or in multiple grid-side converter parallel connections, do not influence system output it is set total idle in the case where, increase a circulation reactive current between each grid-side converter, increase flows through the electric current of grid-side converter, to avoid there is low current operating condition under gentle breeze operating condition.Raising full-power wind power converter power device method of reliability under gentle breeze of the invention has many advantages, such as easy to operate, raising system operation reliability and extends device service life.
Description
Technical field
The invention mainly relates to technical field of wind power, a kind of raising full-power wind power converter power device is refered in particular in gentle breeze
The method of lower reliability.
Background technique
Wind-power electricity generation is that current technology is most mature, new energy of on the largest scaleization exploit condition and commercialized development prospect,
The power of Wind turbines constantly increases, and 5 megawatts of the Wind turbines that domestic-developed goes out at present start business application." the 13 " phase
Between will also develop 8~10 megawatts of offshore wind farm units.
Wind turbines currently based on synchronous generator and the Wind turbines based on double-fed asynchronous generator are each advantageous, together
For present and following mainstream model.Full-power wind power converter is the key equipment of synchronous generator type Wind turbines, power generation
The electric energy needs that machine issues all are sent to power grid by the current transformer.Other than mating synchronous generator, also there is part big at present
The common asynchronous generator that power Wind turbines use, and electric energy is sent to by power grid by full-power wind power converter.
The operational reliability of wind electric converter seriously affects the generated energy of unit.With constantly getting over for Wind turbines capacity
Greatly and Wind turbines start large-scale application in Oversea wind power generation, and higher, and function is required to the operational reliability of equipment
Rate device (such as IGBT) is the core devices that current transformer realizes electric current conversion again, and operational reliability is directly related to current transformer
Functional reliability and service life.
IGBT (insulated gate bipolar transistor) is a kind of voltage-controlled type power electronic devices, has driving power small, conducting pressure
It reduces, the features such as switching loss is small and capacity is big, has been widely used in industries such as locomotive traction, industrial frequency conversion, wind-power electricity generations.
The trend of Wind turbines development is that single-machine capacity is increasing, and matched wind electric converter capacity is also increasing, wherein
Large capacity IGBT is widely applied.But show the crash rate ratio little Rong of large capacity IGBT from industrial application statistical analysis
Amount it is much higher, and be generally acknowledged that IGBT operating current is small under low current, heating loss is low and use should be safer, so
And it is true really not so, statistical data shows that crash rate of the converter module based on IGBT under low current operating condition is bright
It is aobvious to be higher than the case where running on high current.It is (high-power " a kind of high-power converter module failure analysis " under low current
Semiconductor Converting Technology the 1st phase in 2013) text points out, there are two important features under low current for the IGBT element manipulation of current transformer:
1) FWD (Flee Wheel Diode, freewheeling diode) surge voltage is higher when operating current is smaller；
FWD surge voltage caused by diode reverse recovery when for being opened as IGBT, usual collector current is in its volume
The surge voltage is larger when within the scope of the part to 1/tens low current of constant current.If this peak voltage is super
Reverse bias safety operation area is crossed, there are breakdown risks for the IGBT element.
2) there are dead zone oscillatory occurences when operating current is smaller, i.e., in dead time, by distribution capacity and current transformer master
Circuit inductance influences, and the end IGBT voltage will vibrate, and dead zone end voltage oscillation may cause the small pulsewidth conducting phenomenon of FWD,
And small conducting pulsewidth it is small to a certain extent when, peak voltage Vsp is well beyond member when may make IGBT element FWD Reverse recovery
The pressure resistance of part.Although it is not high that dead zone vibrates such probability, under typical products in mass production application, such failure will become
Obviously.In addition, although IGBT element can be to avoid allowing IGBT element grid by pulse processing circuit under low current working condition
Pole receives narrow pulse signal, but in actual operation it is possible to there is the case where tiny time conducting.As it can be seen that current transformer
IGBT element reliability under working condition under low current will decline to a great extent, and greatly reduce the service life of IGBT.
Wind electric converter based on IGBT power device is back-to-back two three-phase bridge topological forms, energy energy bidirectional flow
It is dynamic.Current transformer can be divided into grid side current transformer and generator-side converter by function and position inside.The wherein change of grid side
Stream device is generally PWM rectification control mode, and control target is the voltage of stable DC side.Under high wind conditions, grid side becomes
The output electric current for flowing device is larger and smooth, however in small wind or gentle breeze, because the wind power of Wind turbines conversion is too small, electricity
The current effective value very little of grid-side converter, due to the frequent on-off of device for power switching, the current convergence under low current exists
Zero crossings and frequently change (as shown in Figure 1) through the positive and negative direction of zero crossing, according to the analysis situation of front, according to current industry
Control method, in gentle breeze, wind electric converter substantially works at low currents, will substantially reduce current transformer function
The reliability and service life of rate device, this phenomenon might as well be known as the low current operation phenomenon of gentle breeze operating condition, as generator
Side current transformer, in the case where generally operating in non-unity power factor due to generator, even if under micropower operating condition, hair
Motor side current transformer is not in long-time low current operating condition due to reactive current to be exported.
Patent CN103545820B be directed to double-fed wind energy converter, propose improve its power device can under gentle breeze operating condition
By the method for property, strategy is the technical characterstic used according to double-fed wind energy converter, exports set total nothing not influencing system
In the case that function requires, by coordinate to increase the method for grid side current transformer and motor side current transformer reactive current come or increase micro-
Double-fed wind energy converter flows through electric current when wind or wind turbine power generation power very little, to avoid low current operating condition and be easy to make
The case where power devices damage.Full-power wind power converter and double-fed wind energy converter due to the difference in operational mode, on
Patented method is stated to be difficult to indiscriminately imitate utilization.
Summary of the invention
The technical problem to be solved in the present invention is that, for technical problem of the existing technology, the present invention provides one
Kind is easy to operate, improve system operation reliability and extends the raising full-power wind power converter power device of device service life
The method of part reliability under gentle breeze.
In order to solve the above technical problems, technical solution proposed by the present invention are as follows:
A method of full-power wind power converter power device reliability under gentle breeze is improved, under gentle breeze operating condition,
Do not influence system output it is set it is total it is idle in the case where, be that triangle/star connection can block frequency tripling using grid-connected voltage device
The characteristics of current harmonics, increases each grid-side converter side the frequency tripling reactive current component of a network pressure fundamental frequency, with
Increase the electric current for flowing through grid-side converter, to avoid occurring low current operating condition under gentle breeze operating condition；Or in multiple net sides
When current transformer parallel connection, do not influence system output it is set total idle in the case where, increase by one between each grid-side converter and follow
Ring reactive current increases and flows through the electric current of grid-side converter, to avoid there is low current operating condition under gentle breeze operating condition.
As a further improvement of the above technical scheme:
In two grid-side converter parallel connections, one of grid-side converter issues superposition reactive component, another net side
Current transformer absorbs the reactive component of equivalent, so that reactive component exchanges between two grid-side converters to increase electric current, and guarantees
What is externally exported is total idle constant.
The Rule of judgment of gentle breeze operating condition are as follows: the watt current of grid-side converter is less than preset threshold.
The mode of 2 harmonics is superimposed to the referenced reactive current of grid-side converter in dq synchronous rotating frame
To realize 3 frequency multiplication reactive currents of output.
In the case where multiple net side unsteady flows are in parallel, each increased reactive current component of grid-side converter is identical or not phase
Together.
The full-power wind power converter is made of IGBT or IGCT or IEGT.
Compared with the prior art, the advantages of the present invention are as follows:
The method of raising full-power wind power converter power device reliability under gentle breeze of the invention, had not influenced system both
In the case that fixed output is always idle, to each grid-side converter, avoided by the method for the integer time reactive current of increase by 3 micro-
Low current operating condition in the case of wind；Or in multiple grid-side converter parallel connections, increase the idle electricity flowed between each other
Stream, to improve the power device operational reliability of full-power wind power converter and extend life of product.
Detailed description of the invention
Fig. 1 is the output waveform figure of grid-side converter under gentle breeze operating condition in the prior art.
Fig. 2 is the parallel-connection structure schematic diagram of multiple grid-side converters of the invention.
Fig. 3 is single grid-side converter structural schematic diagram of the invention.
Fig. 4 is full-power wind power converter application schematic diagram of the invention.
Fig. 5 is that full-power wind power converter physical quantity of the invention refers to positive direction schematic diagram.
Fig. 6 is grid-side converter control principle drawing of the invention.
Fig. 7 is the grid-side converter control principle drawing of parallel-connection structure of the present invention.
Net side idle indicator current control logic figure when Fig. 8 is parallel-connection structure of the present invention.
Fig. 9 is the grid-side converter control principle drawing of single convertor cabinet of the present invention.
Figure 10 is the idle indicator current control logic figure of grid side of this bright single convertor cabinet.
Figure 11 is the simulation waveform that the present invention increases frequency tripling reactive current under gentle breeze operating condition.
Specific embodiment
Below in conjunction with Figure of description and specific embodiment, the invention will be further described.
As shown in Fig. 2 to 11, raising full-power wind power converter power device reliability under gentle breeze of the present embodiment
Method, detailed process are as follows: under gentle breeze operating condition, do not influence system output it is set total idle in the case where, utilize grid-connected voltage
Device is the characteristics of triangle/star connection can block frequency tripling current harmonics, increases a network pressure to each grid-side converter side
The frequency tripling reactive current component of fundamental frequency, to increase the electric current for flowing through grid-side converter, to avoid going out under gentle breeze operating condition
Existing low current operating condition；Or in multiple grid-side converter parallel connections, set total idle situation is exported not influencing system
Under, increase a circulation reactive current between each grid-side converter, increase flows through the electric current of grid-side converter, to avoid gentle breeze
Occurs low current operating condition under operating condition.
The method of raising full-power wind power converter power device reliability under gentle breeze of the invention, had not influenced system both
In the case that fixed output is always idle, to each grid-side converter, pass through the 3 integer time reactive current for increasing network pressure fundamental frequency
Method avoids the low current operating condition in gentle breeze；Or in multiple grid-side converter parallel connections, increase mutually it
Between the reactive current that flows, to improve the power device operational reliability of full-power wind power converter and extend life of product.
In the present embodiment, the Rule of judgment of gentle breeze operating condition are as follows: the watt current of grid-side converter is less than preset threshold.
The principle of the present invention is further analyzed and is illustrated below:
Full-power wind power converter is mainly used for variable speed constant frequency synchronous generator or common asynchronous generating type wind-power electricity generation
System connects generator as shown in figure 4, being made of inside full-power wind power converter back-to-back two four quadrant convertors
The current transformer of stator is commonly referred to as motor side current transformer (SSC), and the current transformer for connecting power grid is commonly referred to as grid side current transformer
(GSC).The function of grid side current transformer is mainly used for the voltage of stable DC side, in addition, can according to grid dispatching center needs
Control is to absorb or issue idle to power grid.Motor side current transformer controls watt current (the i.e. torque current point of generator unit stator
Amount) and reactive current (i.e. excitation current component).
Control for grid-side converter, current reference positive direction as shown in Figure 5 will be under dq synchronous rotating frame
D axis is oriented on network voltage synthetic vector direction, converts feelings in the constant amplitude of three-phase static coordinate system to synchronous rotating frame
Under condition, the active-power P of grid side current transformer can be obtainedgAnd reactive power QgAre as follows:
Wherein, udFor the d axis component of power grid phase voltage, idFor the active component of grid side line current.iqFor power grid side line electricity
The reactive component of stream.
Work as QgWhen > 0, indicate that current transformer is externally in perception, it is idle from power grid absorption,
Work as QgIt when < 0, indicates that current transformer is externally in capacitive, is provided to power grid idle.
And for full-power wind power converter, the active of active and grid side current transformer of motor side current transformer is equal
, i.e.,
Pg=Ps (2)
From formula (1) as it can be seen that the reactive component of grid-side converter and the directly proportional linear pass of the reactive current of grid-side converter
System.
The double-closed-loop control method of outer voltage and current inner loop is usually taken in the control of grid-side converter, as shown in Figure 6.
Wherein outer voltage controls are as follows:
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 exported and is instructed as the watt current of current inner loop for stable DC side voltage
Value.And the general i of reactive command value of current inner loopq' generally zero, even if the power factor of grid-side converter is approximately 1, only
In the case where dispatching of power netwoks company is strictly required that Wind turbines provide reactive power support to power grid to stablize network voltage, the nothing
The idle amount Q that function instruction will be come by complete machine control system transmissiong *Or reactive current amount iq *It is required that value, the blower run at present
Grid side current transformer is essentially all work in iq *The case where being 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 practical watt current of device, iqFor the practical reactive current of grid-side converter, id *For grid-side converter active current command value, iq *For net
Side current transformer referenced reactive current value.
Output control instruction voltage v of the output of current inner loop as current transformerd' and vq′。
Control for motor side current transformer equally uses vector control method, realizes active and idle decoupling control.
For common asynchronous wind driven generator, can all need to absorb idle, nothing since it either works under gentle breeze or high wind conditions
Function electric current needs are provided by motor side current transformer, therefore motor side current transformer is not in low current operating condition.And for synchronization
The control of wind-driven generator, it is zero that common control method, which is by Stator energization current control, in order to avoid electricity small under gentle breeze
Operating condition is flowed, the reactive current of generator-side converter wear can be artificially increased, make synchronous generator work in slight weak magnetic or increases magnetic shape
State.Therefore low current operating condition can easily be avoided for generator-side converter wear, therefore of the invention emphasis is placed upon electricity
In terms of how grid-side converter avoids low current operating condition.
For two kinds of different structure forms of full-power wind power converter, its grid side current transformer is provided separately below micro-
The different control strategies for avoiding low current to run in the case of wind.
Grid side unsteady flow as shown in Fig. 2, the system structure of current transformer parallel connection sub- for two, under dq synchronous rotating frame
Device referenced reactive current is set in the following manner:
Shown in the improvement part as shown in Fig. 7 dashed box, grid side current transformer control principle drawing takes its neutron current transformer 1#'s
Reactive command electric current are as follows:
Then take the reactive command electric current of another sub- current transformer 2# are as follows:
Wherein, Qg *Reactive command when requiring Wind turbines to send out idle for dispatching of power netwoks.iqwFor avoid low current run and
The reactive current (being DC component under synchronous rotary index system) of superposition, idle of guarantee superposition is between sub- current transformer in this way
Exchange, while a sub- current transformer sending is superimposed idle, another sub- current transformer absorbs the idle of equivalent.And grid-side converter
1# exports current amplitude are as follows:
Another grid-side converter 2# exports current amplitude are as follows:
In order to avoid two sub- current transformer grid side low current operations, if output current amplitude will at least reach Iw, that is, need
Meet I simultaneouslym1≥IwAnd Im2≥Iw, id' be voltage control loop pi regulator output, be internal current control ring it is defeated
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'
|≥IwWhen, it is clear that meet condition, then takes iqw=0；And work as | id'|<IwAndDesirable iqw=0.And | id'|<
IwAndIt is desirableThe control logic process of the available such as Fig. 8 of above-mentioned processing method
Figure describes.
As the power capacity of full-power wind power converter constantly increases, entire current transformer can be by two or more
Low capacity sub- current transformer composition, the case where current transformer for three or more is formed in parallel, can take above-mentioned similar
Method realizes that the idle of superposition only flows between each sub- current transformer without influencing the total idle of system external output and always having
Function, while having the function that avoid low current operation from improving power device reliability and service life in the case of gentle breeze.
As shown in figure 3, be different from more cabinet parallel-connection structures, single convertor cabinet ensure not influence system it is set always export it is active
In the case where idle requirement, grid-side converter simply can not be superimposed one in dq synchronous coordinate system as shown in Figure 7
The method of a reactive current avoids the low current operating condition in the case of gentle breeze.But since every Fans pass through grid-connected change
Depressor is grid-connected, and what current transformer grid side connected is the low-pressure side of grid-connected transformer, and winding is usually star connection, and grid-connected change
The high-pressure side that depressor connects bulk power grid is delta connection, and such connection can block secondary (the i.e. frequency of the integer for being sent on high-tension side 3
Rate is 3,6,9 ... times of network pressure fundamental frequency) harmonic current.The present invention dexterously utilizes this technology of grid-connected transformer special
Point allows full-power wind power converter artificially suitably to increase (under a rest frame) network pressure base in gentle breeze small-power situation
3 frequency multiplication reactive current components of wave frequency rate, then the resulting idle high-pressure side that will not be transmitted to grid-connected transformer, also
It will not influence the set idle requirement that blower is sent to power grid.Therefore, for single cabinet wind electric converter, what this patent proposed is avoided
Low current runs and improves (dashed box institute shown in the method control figure as shown in Figure 9 of device for power switching operational reliability
The improvement part shown).
Before the integer frequency reactive component of superposition 3, the total current amplitude of net side output is
If Im≥Iw, just without being superimposed reactive component, that is, take iq +=0, otherwise, it can use q+=Iwsin[(3k-1)ω1T], wherein k is the integer greater than 0.In view of the switching frequency of high-power full power convertor will not be too high, k=can use here
1, the method for realization is to be superimposed 2 harmonics, such net side to former direct current reactive command in dq synchronous rotating frame
The reality of output is exactly 3 frequency multiplication reactive currents.Above-mentioned simple control logic can the logic control flow process figure shown in following 10 retouch
It states:
As shown in figure 11, (i.e. frequency is network pressure fundamental wave to 3 frequencys multiplication of grid side increase when giving the small-power in gentle breeze
3 times of frequency) output current of converter comparison before and after reactive current simulation waveform, first half is not increased waveform, after
Half portion is the waveform after increasing, it is seen then that after increasing by 3 frequency multiplication reactive currents, the electric current for flowing through current transformer device for power switching is frequent
The number of zero passage considerably reduces, and the operational reliability and service life of device for power switching will be enhanced.
Certainly, the control improved method given here for non-parallel-connection structure current transformer can be applied equally to and be coupled
The case where structure current transformer.That is, for the current transformer of parallel-connection structure, every sub- current transformer net side control can be as mentioned above
Non- parallel-connection structure situation it is the same, can respectively be superimposed 3 identical or different frequency multiplication reactive current components and avoid small electricity to reach
The purpose of stream operation phenomenon.In addition 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 taken, avoids small electricity by increasing the fundamental reactive current of motor side current transformer internal flow
Operating condition is flowed, the direct torque without influencing generator.
In the present embodiment, method of the invention is suitable for the power switch based on the various voltages 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 equally taken
Method can increase the reactive current of motor side current transformer internal flow to avoid low current operating condition, to not influence to generate electricity
The direct torque of machine.
Method of the invention does not need newly added equipment, using the characteristics of full-power wind power converter itself and grid-connected transformer
Technical characterstic, it is only necessary to control strategy improve just can avoid full-power wind power converter device for power switching small electricity
Stream operation bad working environments help to improve power device service life and enhance the operational reliability of current transformer；And operation letter
Just, it will not influence the total active and idle size of system external output.
The above is only the preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-described embodiment,
All technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
For those of ordinary skill, several improvements and modifications without departing from the principles of the present invention should be regarded as protection of the invention
Range.
Claims (6)
1. a kind of method for improving full-power wind power converter power device reliability under gentle breeze, which is characterized in that in gentle breeze
Under operating condition, do not influence system output it is set total idle in the case where, a network pressure fundamental wave is increased to each grid-side converter side
The frequency tripling reactive current component of frequency, to increase the electric current for flowing through each grid-side converter, to avoid occurring under gentle breeze operating condition
Low current operating condition；Or in multiple grid-side converter parallel connections, do not influence system output it is set total idle in the case where,
Increase a circulation reactive current between each grid-side converter, increase flows through the electric current of grid-side converter, to avoid gentle breeze work
Occurs low current operating condition under condition；Wherein be superimposed it is idle only between each sub- current transformer flowing without influence system external it is defeated
Out total idle and total active；Grid-connected transformer between the wind electric converter and power grid is triangle/star connection.
2. the method according to claim 1 for improving full-power wind power converter power device reliability under gentle breeze,
It is characterized in that, in two grid-side converter parallel connections, one of grid-side converter issues superposition reactive component, another net side
Current transformer absorbs the reactive component of equivalent, so that reactive component exchanges between two grid-side converters to increase electric current, and guarantees
What is externally exported is total idle constant.
3. the method according to claim 1 or 2 for improving full-power wind power converter power device reliability under gentle breeze,
It is characterized in that, the Rule of judgment of gentle breeze operating condition are as follows: the watt current of grid-side converter is less than preset threshold.
4. the method according to claim 1 or 2 for improving full-power wind power converter power device reliability under gentle breeze,
It is characterized in that, the mode of 2 harmonics is superimposed to the referenced reactive current of grid-side converter come realize 3 frequencys multiplication of output without
Function electric current.
5. the method according to claim 1 or 2 for improving full-power wind power converter power device reliability under gentle breeze,
It is characterized in that, in the case where multiple net side unsteady flows are in parallel, each increased reactive current component of grid-side converter it is identical or
It is not identical.
6. the method according to claim 1 or 2 for improving full-power wind power converter power device reliability under gentle breeze,
It is characterized in that, the full-power wind power converter is made of IGBT or IGCT or IEGT.
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