CN106130078A - A kind of net side converter control method and device - Google Patents
A kind of net side converter control method and device Download PDFInfo
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- CN106130078A CN106130078A CN201610476099.1A CN201610476099A CN106130078A CN 106130078 A CN106130078 A CN 106130078A CN 201610476099 A CN201610476099 A CN 201610476099A CN 106130078 A CN106130078 A CN 106130078A
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/40—Synchronising a generator for connection to a network or to another generator
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Abstract
This application discloses a kind of net side converter control method and device, the method includes: obtain the active power of output of net side converter；The switching frequency reducing the described net side converter of increase with the active power of output of described net side converter, and judge that whether the active power of output of described net side converter is less than the first preset value, if, net side converter described in continuous space Vector Pulse Width Modulation technical controlling is used to be incorporated into the power networks, it is incorporated into the power networks if it is not, use discontinuous space vector pulse width modulation to control described net side converter.On the premise of the application achieves the output harmonic wave performance during improving that net side converter is whole and being incorporated into the power networks, it is to avoid cause switching loss excessive.
Description
Technical field
The present invention relates to electric and electronic technical field, more particularly, it relates to a kind of net side converter control method and dress
Put.
Background technology
SVPWM (Space Vector Pulse Width Modulation, space vector pulse width modulation) technology compared to
Traditional SPWM Technique has the advantages such as DC bus-bar voltage utilization rate is high, percent harmonic distortion is little, be easily achieved, because of
And obtain a wide range of applications in electric electronic current change technology.
SVPWM is divided into CSVPWM (Continuous SVPWM, continuous space Vector Pulse Width Modulation) and DSVPWM
(Discontinuous SVPWM, discontinuous space vector pulse width modulation) two kinds.Compared to opening that DSVPWM, CSVPWM bring
Close loss relatively big, but it has more excellent output harmonic wave performance.Therefore in wind generator system, in order to realize net side converter
Optimum output harmonic wave performance, be typically all use fixed switching frequency the CSVPWM policy control grid-connected fortune of net side converter
OK.
But owing to the output harmonic wave performance of net side converter can diminishing and be deteriorated, so even be to adopt with its output
With the CSVPWM strategy of fixed switching frequency, the output at net side converter becomes less with the change of wind-force power
Time, it is possible to the problem that the output harmonic wave performance that there is net side converter is the most up to standard.Whole also in order to improve net side converter
Output harmonic wave performance during network operation, current solution is arranged by described fixed switching frequency very big, but this
Sample can cause switching loss excessive, so cause system overall efficiency seriously to reduce, power switch pipe temperature rise too high.
Therefore, how on the premise of the output harmonic wave performance during improving that net side converter is whole and being incorporated into the power networks, keep away
Exempt to cause switching loss excessive, it has also become those skilled in the art's problem demanding prompt solution.
Summary of the invention
In view of this, the present invention provides a kind of net side converter control method and device, to realize improving net side unsteady flow
Device is whole be incorporated into the power networks during output harmonic wave performance on the premise of, it is to avoid cause switching loss excessive.
A kind of net side converter control method, including:
Obtain the active power of output of net side converter；
With the switching frequency reducing the described net side converter of increase of the active power of output of described net side converter, and sentence
Whether the active power of output of disconnected described net side converter, less than the first preset value, if so, uses continuous space vector pulse-width to adjust
Described in technical controlling processed, net side converter is incorporated into the power networks, if it is not, it is described to use discontinuous space vector pulse width modulation to control
Net side converter is incorporated into the power networks.
Wherein, the switch reducing the described net side converter of increase of the described active power of output with described net side converter
Frequency, including:
Judge that the active power of output of described net side converter, whether less than the second preset value, if so, controls described net side
Current transformer increases to the first switching frequency from current switch frequency；If it is not, control described net side converter from current switch frequency
Being decreased to second switch frequency, described first switching frequency is more than described second switch frequency.
Wherein, described first switching frequency the highest is opened by what the power switch pipe self in described net side converter limited to
Close frequency；Described second switch frequency is to meet the lowermost switch frequency that the output current harmonics of described net side converter requires.
Wherein, described control described net side converter increases to the first switching frequency from current switch frequency, including: control
Described net side converter controls the cycle from the next one, goes through multiple control cycle and incrementally increases current switch frequency to first
Switching frequency；
Described control described net side converter is decreased to second switch frequency from current switch frequency, including: control described
Net side converter controls the cycle from the next one, goes through multiple control cycle and progressively reduces current switch frequency to second switch
Frequency.
Alternatively, described control described net side converter increases to, before the first switching frequency, also wrap from current switch frequency
Include: judge the persistent period obtaining described net side converter under active power of output is less than described this state of second preset value
Reach the first preset duration；
Described control described net side converter is decreased to, before second switch frequency, also include from current switch frequency: judge
Obtain described net side converter to reach not less than the persistent period under described this state of second preset value at active power of output
Second preset duration.
Alternatively, before net side converter described in described employing continuous space Vector Pulse Width Modulation technical controlling is incorporated into the power networks,
Also include: judge to obtain described net side converter continuing under active power of output is less than described this state of first preset value
Time reaches the 3rd preset duration；
Before the described employing discontinuous space vector pulse width modulation described net side converter of control is incorporated into the power networks, also wrap
Include: judge to obtain described net side converter when active power of output is not less than lasting under described this state of first preset value
Between reach the 4th preset duration.
A kind of net side converter controls device, including:
Acquiring unit, for obtaining the active power of output of net side converter；
Frequency modulation unit, increases described net side converter for reducing of the active power of output with described net side converter
Switching frequency；
First judging unit, for judging that whether the active power of output of described net side converter is less than the first preset value；
CSVPWM unit, for judging to obtain the active power of output of described net side converter at described first judging unit
During less than described first preset value, net side converter described in continuous space Vector Pulse Width Modulation technical controlling is used to be incorporated into the power networks；
DSVPWM unit, for judging to obtain the active power of output of described net side converter at described first judging unit
During not less than described first preset value, discontinuous space vector pulse width modulation is used to control the described grid-connected fortune of net side converter
OK.
Wherein, described frequency modulation unit includes:
Second judging unit, for judging that whether the active power of output of described net side converter is less than the second preset value；
Increase frequency unit, for judging that the active power of output obtaining described net side converter is little at described second judging unit
When described second preset value, control described net side converter and increase to the first switching frequency from current switch frequency；
Lower frequency unit, for judging to obtain the active power of output of described net side converter not at described second judging unit
During less than described second preset value, control described net side converter and be decreased to second switch frequency from current switch frequency, described
First switching frequency is more than described second switch frequency.
Alternatively, described net side converter control device also includes the 3rd judging unit and the 4th judging unit, wherein:
Described 3rd judging unit, is used for judging that described net side converter is preset less than described second at active power of output
It is worth whether the persistent period under this state reaches the first preset duration；Corresponding, the described frequency unit that increases is in described net side
The active power of output of current transformer less than the persistent period of described second preset value and this state reach described first preset time
Time long, control described net side converter and increase to the first switching frequency from current switch frequency；
Described 4th judging unit, is used for judging that described net side converter is second pre-not less than described at active power of output
If whether the persistent period being worth under this state reaches the second preset duration；Corresponding, described lower frequency unit is at described net
The active power of output of side converter reaches described second pre-not less than the persistent period of described second preset value and this state
If during duration, control described net side converter and be decreased to second switch frequency from current switch frequency.
Alternatively, described net side converter control device also includes the 5th judging unit and the 6th judging unit, wherein:
Described 5th judging unit, is used for judging that described net side converter is preset less than described first at active power of output
It is worth whether the persistent period under this state reaches the 3rd preset duration；Corresponding, described CSVPWM unit is at described net
The active power of output of side converter reaches the described 3rd less than the persistent period of described first preset value and this state to be preset
During duration, net side converter described in continuous space Vector Pulse Width Modulation technical controlling is used to be incorporated into the power networks；
Described 6th judging unit, is used for judging that described net side converter is first pre-not less than described at active power of output
If whether the persistent period being worth under this state reaches the 4th preset duration；Corresponding, described DSVPWM unit is for described
The active power of output of net side converter reaches the described 4th not less than the persistent period of described first preset value and this state
During preset duration, use discontinuous space vector pulse width modulation to control described net side converter and be incorporated into the power networks.
From above-mentioned technical scheme it can be seen that the present invention increases institute with the reduction of the active power of output of net side converter
State the switching frequency of net side converter, fix using the CSVPWM strategy of a bigger switching frequency to come Controling network side compared to whole process
The prior art that current transformer is incorporated into the power networks, this net side converter control strategy based on variable power switch frequency of the present invention can be
On the premise of output harmonic wave performance during improving that net side converter is whole and being incorporated into the power networks, effectively reduce switching loss.Additionally,
The present invention also switches to DSVPWM strategy when the active power of output of described net side converter is higher from CSVPWM, with further
Reduce switching loss.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to
Other accompanying drawing is obtained according to these accompanying drawings.
Fig. 1 is a kind of net side converter control method flow chart disclosed in the embodiment of the present invention；
Fig. 2 is the embodiment of the present invention another net side converter control method flow chart disclosed；
Fig. 3 is that disclosed in the embodiment of the present invention, a kind of net side converter controls apparatus structure schematic diagram；
Fig. 4 is that the embodiment of the present invention another net side converter disclosed controls apparatus structure schematic diagram；
Fig. 5 is that the embodiment of the present invention another net side converter disclosed controls apparatus structure schematic diagram；
Fig. 6 is that the embodiment of the present invention another net side converter disclosed controls apparatus structure schematic diagram.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments wholely.Based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under not making creative work premise
Embodiment, broadly falls into the scope of protection of the invention.
See Fig. 1, the embodiment of the invention discloses a kind of net side converter control method, to realize improving net side unsteady flow
Device is whole be incorporated into the power networks during output harmonic wave performance on the premise of, it is to avoid cause switching loss excessive, including:
Step S01: obtain the active power of output P of net side converterg, enter step S01 and step S03 afterwards；
After system electrification, give tacit consent to the CSVPWM strategy using fixed switching frequency and control plan as initial net side converter
Slightly, but do not limit to.
Step S02: with PgReduce increase described net side converter switching frequency, afterwards return step S01；
The present embodiment is according to PgChange dynamically adjust the switching frequency of described net side converter, work as PgJust to institute during reduction
State net side converter and issue bigger switching frequency instruction, to improve the output harmonic wave performance of net side converter, and work as PgRaise
Time just issue the instruction of less switching frequency to described net side converter, to reduce the switching loss of net side converter.Compared to
The prior art of the omnidistance fixing CSVPWM strategy using a bigger switching frequency, the present embodiment is this based on variable power switch frequency
Net side converter control strategy output harmonic wave performance during improving that net side converter is whole and being incorporated into the power networks on the premise of,
Can effectively reduce the switching loss of net side converter.
Step S03: judge PgWhether less than the first preset value, if so, enter step S04；If it is not, enter step S05；
Wherein, described first preset value is the grid-connected active-power P of maximum between 0 and described net side converterHBetween
Any value, i.e. 0 ＜ the first preset value ＜ PH, PHThe usually rated power of 110%.
Step S04: use described in CSVPWM (Continuous SVPWM, continuous space Vector Pulse Width Modulation) technical controlling
Net side converter is incorporated into the power networks, and returns step S01 afterwards；
Step S05: use DSVPWM (Discontinuous SVPWM, discontinuous space vector pulse width modulation) technology control
Make described net side converter to be incorporated into the power networks, return step S01 afterwards；
The present embodiment is according to PgChange dynamically adjust described net side converter switching frequency while, always according to Pg
Change toggle CSVPWM and DSVPWM both net side converter control strategies, work as PgCSVPWM plan is used time relatively low
Slightly, P is worked asgUsing DSVPWM strategy time higher, so can reduce the switching loss of net side converter further, reason is as follows:
CSVPWM strategy is used to can ensure that the optimal DC voltage utilization rate of net side converter and output harmonic wave performance；But at PgHigher
Time, compared to CSVPWM strategy, the interference using DSVPWM strategy to cause the output harmonic wave performance of net side converter is minimum, base
This is negligible, but it can effectively reduce the switching loss of net side converter, and therefore the present embodiment is at PgRelatively Gao Shicong
CSVPWM switches to DSVPWM strategy, to reduce the switching loss of net side converter further.
Seen from the above description, the present embodiment is with PgReduce increase described net side converter switching frequency, compared to
The omnidistance fixing CSVPWM strategy using a bigger switching frequency comes the prior art that Controling network side converter is incorporated into the power networks, this reality
Execute that this net side converter control strategy based on variable power switch frequency of example can net side converter is whole to be incorporated into the power networks improving
During output harmonic wave performance on the premise of, effectively reduce switching loss.Additionally, the present embodiment is also at PgRelatively Gao Shicong
CSVPWM switches to DSVPWM strategy, to reduce the switching loss of net side converter further.
Wherein, described according to PgChange dynamically adjust the switching frequency of described net side converter, namely according to PgChange
Change the described net side converter of control to switch between at least two switching-frequency value.But in view of described net side converter too much
Between switching-frequency value, switching can cause control complexity too high, and therefore the present embodiment is to control described net side converter at 2
Between switching-frequency value, switching is as preferably.Corresponding, seeing Fig. 2, above-mentioned steps S02 specifically includes:
Step S021: judge PgWhether less than the second preset value, if so, enter step S022；If it is not, entrance step
S023；
Wherein, described second preset value can be equal to described first preset value, it is also possible to is not equal to described first preset value；
It is the rated power of 85% that the present embodiment is recommended to arrange described first preset value, arranges the specified merit that the second preset value is 35%
Rate, but do not limit to.
Step S022: control described net side converter and increase to the first switching frequency from current switch frequency；
Step S023: control described net side converter and be decreased to second switch frequency from current switch frequency, described first
Switching frequency is more than described second switch frequency.
Wherein, the value of described first switching frequency is equal or close in (preferably equal to) described net side converter
The highest switching frequency that power switch pipe self is limited to；The value of described second switch frequency is equal or close to (preferably
It is equal to) meet the lowermost switch frequency that the output current harmonics of described net side converter requires.
Wherein, described step S022 can be specifically to control described net side converter to control the cycle from the next one, goes through
Current switch frequency is incrementally increased to the first switching frequency, as from next control cycle, each control through multiple control cycles
Cycle processed all increases 0.1Hz, until increasing to the first switching frequency；Corresponding, described step S023 can be specifically to control institute
Stating net side converter and control the cycle from the next one, going through multiple control cycle progressively reduces current switch frequency and opens to second
Closing frequency, as from next control cycle, each control cycle reduces 0.1Hz, until being decreased to second switch frequency, with
Switching frequency is avoided significantly to increase and decrease and the operation stability of net side converter is caused the biggest interference.
Wherein, for avoiding PgChange too frequently causes net side converter in the first switching frequency and second switch frequency
Lower frequently switching, so that significantly increasing control complexity, the present embodiment also can take following Optimized Measures: the present embodiment
P is obtained in judgementgWhen reaching the first preset duration less than the persistent period of described second preset value and this state, just control institute
State net side converter and increase to the first switching frequency from current switch frequency；Corresponding, obtain P in judgementgNot less than described
When the persistent period of two preset values and this state reaches the second preset duration, just control described net side converter from current switch
Frequency is decreased to second switch frequency.Described first preset duration and described second preset duration could be arranged to same value (such as 1
Minute), it is also possible to it is set to different value.
Same reason, for avoiding PgChange too frequently causes net side converter in two kinds of plans of CSVPWM and DSVPWM
Frequently switching under slightly, the present embodiment also can take following Optimized Measures: the present embodiment obtains P in judgementgFirst pre-less than described
If the persistent period of value and this state reaches three preset duration, just use net side converter described in CSVPWM technical controlling
It is incorporated into the power networks；Corresponding, obtain P in judgementgThe 4th is reached not less than the persistent period of described first preset value and this state
During preset duration, net side converter described in DSVPWM technical controlling is just used to be incorporated into the power networks.Described 3rd preset duration is with described
4th preset duration could be arranged to same value (such as 1 minute), it is also possible to is set to different value.Logic, this reality is controlled for simplifying
Execute example to recommend when described first preset duration, described second preset duration, described 3rd preset duration and the described 4th being preset
Length is set to same value.
See Fig. 3, the embodiment of the invention also discloses a kind of net side converter and control device, to realize becoming in improvement net side
Stream device is whole be incorporated into the power networks during output harmonic wave performance on the premise of, it is to avoid cause switching loss excessive, including:
Acquiring unit 100, for obtaining the active power of output P of net side converterg；
Frequency modulation unit 200, for PgReduce increase described net side converter switching frequency；
First judging unit 300, is used for judging PgWhether less than the first preset value；
CSVPWM unit 400, for judging to obtain P at the first judging unit 300gDuring less than described first preset value, adopt
It is incorporated into the power networks with net side converter described in CSVPWM technical controlling；
DSVPWM unit 500, for judging to obtain P at the first judging unit 300gDuring not less than described first preset value,
Net side converter described in DSVPWM technical controlling is used to be incorporated into the power networks.
Wherein, seeing Fig. 4, frequency modulation unit 200 specifically comprises the steps that
Second judging unit 201, is used for judging PgWhether less than the second preset value；
Increase frequency unit 202, for judging to obtain P at the second judging unit 201gDuring less than described second preset value, control
Described net side converter increases to the first switching frequency from current switch frequency；
Lower frequency unit 203, for judging to obtain P at the second judging unit 201gDuring not less than described second preset value, control
Making described net side converter and be decreased to second switch frequency from current switch frequency, described first switching frequency is more than described second
Switching frequency.
Alternatively, seeing Fig. 5, described net side converter controls device and also includes the 3rd judging unit 601 and the 4th judgement
Unit 602, wherein:
3rd judging unit 601 is used for judging that described net side converter is at PgLess than under described this state of second preset value
Persistent period whether reach the first preset duration；Corresponding, increase frequency unit 202 at PgLess than described second preset value and
When the persistent period of this state reaches described first preset duration, control described net side converter and increase from current switch frequency
To the first switching frequency；
4th judging unit 602 is used for judging that described net side converter is at PgNot less than described this state of second preset value
Under persistent period whether reach the second preset duration；Corresponding, lower frequency unit 203 is at PgPreset not less than described second
When the persistent period of value and this state reaches described second preset duration, control described net side converter from current switch frequency
It is decreased to second switch frequency.
Alternatively, described net side converter controls device and also includes the 5th judging unit 603 and the 6th judging unit 604,
Wherein:
5th judging unit 603, is used for judging that described net side converter is at PgLess than described this state of first preset value
Under persistent period whether reach the 3rd preset duration；Corresponding, CSVPWM unit 400 is at PgPreset less than described first
When the persistent period of value and this state reaches described three preset duration, use net side converter described in CSVPWM technical controlling
It is incorporated into the power networks；
6th judging unit 604, is used for judging that described net side converter is at PgNot less than described this shape of first preset value
Whether the persistent period under state reaches the 4th preset duration；Corresponding, DSVPWM unit 500 is at PgNot less than described first
When the persistent period of preset value and this state reaches described four preset duration, use and described in DSVPWM technical controlling, net side change
Stream device is incorporated into the power networks.
In sum, the present invention is with PgReduce increase described net side converter switching frequency, fix compared to whole process
The CSVPWM strategy using a bigger switching frequency carrys out the prior art that Controling network side converter is incorporated into the power networks, this base of the present invention
Net side converter control strategy in variable power switch frequency can defeated during improving that net side converter is whole and being incorporated into the power networks
On the premise of going out harmonic performance, effectively reduce switching loss.Additionally, the present invention is also at PgSwitch to from CSVPWM time higher
DSVPWM strategy, to reduce the switching loss of net side converter further.
In this specification, each embodiment uses the mode gone forward one by one to describe, and what each embodiment stressed is and other
The difference of embodiment, between each embodiment, identical similar portion sees mutually.For device disclosed in embodiment
For, owing to it corresponds to the method disclosed in Example, so describe is fairly simple, relevant part sees method part and says
Bright.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses the present invention.
Multiple amendment to these embodiments will be apparent from for those skilled in the art, as defined herein
General Principle can realize in the case of without departing from the spirit or scope of the embodiment of the present invention in other embodiments.Therefore,
The embodiment of the present invention is not intended to be limited to the embodiments shown herein, and be to fit to principles disclosed herein and
The widest scope that features of novelty is consistent.
Claims (10)
1. a net side converter control method, it is characterised in that including:
Obtain the active power of output of net side converter；
With the switching frequency reducing the described net side converter of increase of the active power of output of described net side converter, and judge institute
Whether the active power of output stating net side converter is less than the first preset value, if so, uses continuous space Vector Pulse Width Modulation skill
Art controls described net side converter and is incorporated into the power networks, if it is not, use discontinuous space vector pulse width modulation to control described net side
Current transformer is incorporated into the power networks.
Net side converter control method the most according to claim 1, it is characterised in that described with described net side converter
The switching frequency reducing the described net side converter of increase of active power of output, including:
Judge that the active power of output of described net side converter, whether less than the second preset value, if so, controls described net side unsteady flow
Device increases to the first switching frequency from current switch frequency；Reduce if it is not, control described net side converter from current switch frequency
To second switch frequency, described first switching frequency is more than described second switch frequency.
Net side converter control method the most according to claim 2, it is characterised in that:
The highest switching frequency that described first switching frequency is limited to by the power switch pipe self in described net side converter；
Described second switch frequency is to meet the lowermost switch frequency that the output current harmonics of described net side converter requires.
Net side converter control method the most according to claim 2, it is characterised in that described control described net side converter
The first switching frequency is increased to from current switch frequency, including: control described net side converter and control the cycle from the next one,
Going through multiple control cycle incrementally increases current switch frequency to the first switching frequency；
Described control described net side converter is decreased to second switch frequency from current switch frequency, including: control described net side
Current transformer from the next one control the cycle, go through multiple control cycle progressively reduce current switch frequency to second switch frequency
Rate.
5. according to the net side converter control method described in claim 2,3 or 4, it is characterised in that described control described net side
Current transformer increases to, before the first switching frequency, also include from current switch frequency: judge to obtain described net side converter in output
Active power reaches the first preset duration less than the persistent period under described this state of second preset value；
Described control described net side converter is decreased to, before second switch frequency, also include from current switch frequency: judge to obtain
The described net side converter persistent period under active power of output is not less than described this state of second preset value reaches second
Preset duration.
Net side converter control method the most according to claim 1, it is characterised in that described employing continuous space vector arteries and veins
Before the wide modulation technique described net side converter of control is incorporated into the power networks, also include: judge that obtaining described net side converter has in output
Merit power reaches the 3rd preset duration less than the persistent period under described this state of first preset value；
Before the described employing discontinuous space vector pulse width modulation described net side converter of control is incorporated into the power networks, also include: sentence
Disconnected obtain the described net side converter persistent period under active power of output is not less than described this state of first preset value and reach
To the 4th preset duration.
7. a net side converter controls device, it is characterised in that including:
Acquiring unit, for obtaining the active power of output of net side converter；
Frequency modulation unit, for the switch reducing the described net side converter of increase of the active power of output with described net side converter
Frequency；
First judging unit, for judging that whether the active power of output of described net side converter is less than the first preset value；
At described first judging unit, CSVPWM unit, for judging that the active power of output obtaining described net side converter is less than
During described first preset value, net side converter described in continuous space Vector Pulse Width Modulation technical controlling is used to be incorporated into the power networks；
At described first judging unit, DSVPWM unit, for judging that the active power of output obtaining described net side converter is the least
When described first preset value, use discontinuous space vector pulse width modulation to control described net side converter and be incorporated into the power networks.
Net side converter the most according to claim 7 controls device, it is characterised in that described frequency modulation unit includes:
Second judging unit, for judging that whether the active power of output of described net side converter is less than the second preset value；
Increase frequency unit, for judging that the active power of output obtaining described net side converter is less than institute at described second judging unit
When stating the second preset value, control described net side converter and increase to the first switching frequency from current switch frequency；
At described second judging unit, lower frequency unit, for judging that the active power of output obtaining described net side converter is not less than
During described second preset value, control described net side converter and be decreased to second switch frequency from current switch frequency, described first
Switching frequency is more than described second switch frequency.
Net side converter the most according to claim 8 controls device, it is characterised in that described net side converter controls device
Also include the 3rd judging unit and the 4th judging unit, wherein:
Described 3rd judging unit, be used for judging described net side converter active power of output less than described second preset value this
Whether the persistent period under one state reaches the first preset duration；Corresponding, the described frequency unit that increases is in described net side unsteady flow
When the active power of output of device reaches described first preset duration less than the persistent period of described second preset value and this state,
Control described net side converter and increase to the first switching frequency from current switch frequency；
Described 4th judging unit, is used for judging that described net side converter is not less than described second preset value at active power of output
Whether the persistent period under this state reaches the second preset duration；Corresponding, described lower frequency unit is for becoming in described net side
The active power of output of stream device not less than the persistent period of described second preset value and this state reach described second preset time
Time long, control described net side converter and be decreased to second switch frequency from current switch frequency.
Net side converter the most according to claim 7 controls device, it is characterised in that described net side converter controls dress
Put and also include the 5th judging unit and the 6th judging unit, wherein:
Described 5th judging unit, be used for judging described net side converter active power of output less than described first preset value this
Whether the persistent period under one state reaches the 3rd preset duration；Corresponding, described CSVPWM unit is for becoming in described net side
The active power of output of stream device reaches described 3rd preset duration less than the persistent period of described first preset value and this state
Time, use net side converter described in continuous space Vector Pulse Width Modulation technical controlling to be incorporated into the power networks；
Described 6th judging unit, is used for judging that described net side converter is not less than described first preset value at active power of output
Whether the persistent period under this state reaches the 4th preset duration；Corresponding, described DSVPWM unit is in described net side
The active power of output of current transformer reaches the described 4th not less than the persistent period of described first preset value and this state to be preset
During duration, use discontinuous space vector pulse width modulation to control described net side converter and be incorporated into the power networks.
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| CN110943602A (en) * | 2018-09-25 | 2020-03-31 | 许继集团有限公司 | Converter switching frequency control method and control system |
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