CN108258711B - DC bus-bar voltage control system and its control method - Google Patents
DC bus-bar voltage control system and its control method Download PDFInfo
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- CN108258711B CN108258711B CN201611270537.5A CN201611270537A CN108258711B CN 108258711 B CN108258711 B CN 108258711B CN 201611270537 A CN201611270537 A CN 201611270537A CN 108258711 B CN108258711 B CN 108258711B
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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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
-
- 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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
- H02J2003/365—Reducing harmonics or oscillations in HVDC
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Abstract
The invention discloses a kind of DC bus-bar voltage control system and its control methods, are related to wind power generation field.DC bus-bar voltage control system includes: the DC voltage regulation module being sequentially connected in series, current control module, DC side module and on-position feed-forward module, DC voltage VdcWith on-position parameter DcAfter multiplication, it is input to on-position feed-forward module, the output of on-position feed-forward module is as braking compensation electric current Ic, braking compensation electric current IcCurrent compensation node in the form of feedovering between feed-in current control module and DC side module, the output I with current control moduledMake the difference rear input direct-current side form block；On-position parameter DcFor the dynamic parameter for characterizing DC side brake apparatus action state；On-position feed-forward module is according to on-position parameter DcCalculate the computing module of compensation electric current.Solve the problems, such as DC voltage wide fluctuations in the dynamic process of voltage adjusting.
Description
Technical field
The present invention relates to wind power generation fields, more particularly to the control system and control method of DC bus-bar voltage.
Background technique
With the continuous improvement of wind-power electricity generation installed capacity, wind-powered electricity generation ratio shared in power grid increasingly increases, grid-connected wind
Influencing each other between electric system and power grid is also increasing, in order to make two when wind power system or network voltage fluctuate
The reduction that influences each other of person, it is desirable that wind power system has stronger voltage ride through ability.It is with permanent magnet direct-drive wind power generation system
The voltage matches of example, pusher side and net side that wind generator system is realized by controlling the constant control of DC bus-bar voltage are one
The good control means of kind.
Prior art discloses a kind of control program, Control system architecture is as shown in Figure 1.Wherein, wind power system uses
Double PWM (pulse width modulation, pulse width modulation) transformer configuration, the DC link among converter are used
To realize the decoupling of former and later two converters, DC link is realized by capacitor C.
The effect of DC link is, keeps the control of the converter of net side and pusher side mutually indepedent, when net side occurs
When minor failure, it can be stablized by the adjusting control DC bus-bar voltage on grid side converter without influencing machine-side converter
Control；Conversely, when there is abnormal running in motor side, if by the convertor controls of motor side can guarantee maximal wind-energy with
The realization of track, that is, MPPT (Maximum Power Point Tracking, MPPT maximum power point tracking), only for grid side converter
It is equivalent to a load disturbance, the two-way flow of power is so realized, to electric network fault by certain adaptability.Meanwhile being
The overtension for preventing DC bus, joined " discharging circuit " in DC link, " discharging circuit " is by switching power devices
In series with a resistance, control mode is, when DC bus-bar voltage exceeds limit value, switching power devices conducting, from
And DC voltage is adjusted close to given value.
In the control system of figure 1, the controller of generator side pwm converter is by MPPT, current control module and SVPWM
(Space Vector Pulse Width Modulation, space vector pulse width modulation) module concatenation is realized；Grid side PWM
The controller of converter is realized by voltage control module, current control module, SVPWM module concatenation；Discharging circuit controller is then
For individual PI control module.Wherein, discharging circuit controller a kind of embodiment as shown in Fig. 2, power device input
After end/output end is in series with a resistor, it is connected in the both ends of capacitor C.Discharging circuit controller includes pi regulator (i.e. ratio product
Divide adjuster) and comparator, by DC tache voltage detected value UdcWith reference voltage U when malfunctiondc_refAfter generate
Difference signal Δ Udc, an input terminal of comparator, another input terminal input clock of comparator are sent into after pi regulator
Pulse signal, the control terminal of the output end connection power device of comparator.By controlling the turn-on and turn-off of power device, thus
DC voltage is adjusted close to setting value.
Using Fig. 1, Control system architecture shown in Fig. 2 as representative, in existing DC bus-bar voltage control strategy, for mother
The unusual fluctuations of line voltage are all by the way of the control of univoltage ring, in this control structure, when DC bus-bar voltage occurs
When fluctuation, this variation exists for entire control system as disturbance.Also, since current transformer DC control ring lacks
It is able to reflect the link that discharging circuit influences DC voltage less, DC control ring can not be adjusted accurately in discharging circuit work
DC voltage is saved, in the dynamic process of DC voltage regulation, the fluctuation meeting of the power device of discharging circuit due to DC voltage
On-off repeatedly causes DC voltage wide fluctuations.
Summary of the invention
In view of above-described one or more problems, the present invention provides a kind of DC bus-bar voltage controller and its controls
Method processed.It is intended to reduce the DC voltage oscillation after abnormal operational conditions occur in voltage adjustment process, anti-locking system is not
Stablize.
In a first aspect, the embodiment of the invention provides a kind of DC bus-bar voltage control systems, comprising: what is be sequentially connected in series is straight
Flow voltage regulator module, current control module and DC side module, the DC voltage V of DC side module outputdcThrough negative-feedback
With reference voltageIt is compared, input of the difference as DC voltage regulation module, which further includes on-position
Feed-forward module, DC voltage VdcWith on-position parameter DcAfter multiplication, it is input to on-position feed-forward module, before on-position
The output of module is presented as braking compensation electric current Ic, the current compensation between current control module and DC side module is set
Node, braking compensation electric current IcThe feed-in current compensation node in the form of feedovering, the output I with current control moduledIt is inputted after making the difference
DC side module；Wherein, on-position parameter DcFor the dynamic parameter for characterizing DC side brake apparatus action state；On-position
Feed-forward module is according to on-position parameter DcCalculate compensation electric current IcComputing module.
In some embodiments of first aspect, on-position parameter DcFor the turn-on time duty of DC side brake apparatus
Compare Dchopper, wherein D when DC side brake apparatus is in running orderchopper=1, DC side brake apparatus is in inoperative shape
D when statechopper=0.
In some embodiments of first aspect, when DC side brake apparatus is in running order, on-position feedforward
The equivalent transfer function of moduleWherein, TsDuty cycle of switching for DC side brake apparatus is corresponding
Clock cycle, RchopperFor the resistance value of braking resistor in DC side brake apparatus, kiFor integral constant, t is the time.
In some embodiments of first aspect, when DC side brake apparatus is in off working state, before on-position
Present the equivalent transfer function of moduleWherein, Ic(tstop) it is that on-position feed-forward module is cut
It is changed to braking compensation electric current at the time of off working state, kdTo exit feedforward time parameter, VdcFor DC voltage, tstopFor
The time that the DC side brake apparatus stops working, t are time and tstop≤t≤kd。
In some embodiments of first aspect, when DC side brake apparatus is in off working state, before on-position
Present the equivalent transfer function G of modulef=0, wherein t is time and t > kd。
Second aspect, the embodiment of the invention provides a kind of direct current bus voltage control method, DC bus-bar voltage controls
Circuit includes: DC voltage regulation module, current control module, DC side module and on-position feed-forward module, direct current side form
The DC voltage V of block outputdcThrough negative-feedback and reference voltageIt is compared, difference is as DC voltage regulation module
Input,
Direct current bus voltage control method the following steps are included:
Obtain the on-position parameter D of DC side brake apparatusc；
According to on-position parameter DcWith DC voltage VdcCalculate braking compensation electric current Ic；
Braking is compensated into electric current IcElectric current I is exported as feedforward and current control moduledIt compares；
Current control module is exported into electric current IdElectric current I is compensated with brakingcInput of the difference as DC side module.
In some embodiments of second aspect, on-position parameter DcFor the turn-on time duty of DC side brake apparatus
Compare Dchopper, wherein D when DC side brake apparatus is in running orderchopper=1, DC side brake apparatus is in inoperative shape
D when statechopper=0.
In some embodiments of second aspect, in the on-position parameter D for obtaining DC side brake apparatuscThe step of
In, braking compensation electric current I is calculated by on-position feed-forward modulec, by on-position parameter DcWith DC voltage VdcIt is multiplied, and
Using product as the input of on-position feed-forward module, the output of on-position feed-forward module is braking compensation electric current Ic。
In some embodiments of second aspect, when DC side brake apparatus is in running order, on-position feedforward
The equivalent transfer function of moduleWherein, TsFor power device switch duty in DC side brake apparatus
Than corresponding clock cycle, RchopperFor the resistance value of braking resistor in DC side brake apparatus, kiFor integral constant.
In some embodiments of second aspect, when DC side brake apparatus is in off working state, before on-position
Present the equivalent transfer function of moduleWherein, Ic(tstop) it is that on-position feed-forward module is cut
It is changed to braking compensation electric current at the time of off working state, kdTo exit feedforward time parameter, VdcFor DC voltage, tstopFor
The time that the DC side brake apparatus stops working, and tstop≤t≤kd。
In some embodiments of second aspect, when DC side brake apparatus is in off working state, before on-position
Present the equivalent transfer function G of modulef=0, wherein t > kd。
Using the DC bus-bar voltage controller and its control method in the embodiment of the present invention, due to DC side brake apparatus
Influence to DC voltage is no longer to be purely by way of the disturbance of voltage control loop, but be embodied in voltage control by feed-forward mode
Among ring processed, to be influenced to offset, the oscillation of DC voltage and system in adjustment process when avoiding electric voltage exception
It is unstable.
Detailed description of the invention
The present invention may be better understood from the description with reference to the accompanying drawing to a specific embodiment of the invention,
In:
Fig. 1 is the structural schematic diagram of existing double PWM wind power control systems；
Fig. 2 is the circuit structure diagram of DC side-discharging circuit controller in system shown in Figure 1；
Fig. 3 A is wind generator system direct current ring control system architecture schematic diagram；
Fig. 3 B is the transmission function block diagram of control system shown in Fig. 3 A；
Fig. 4 is the structural block diagram of the DC bus-bar voltage control system of the embodiment of the present invention；
Fig. 5 is the schematic diagram for being not introduced into the dynamic response process of DC voltage over-voltage of on-position feedforward；
Fig. 6 is the schematic diagram for introducing the dynamic response process of the DC voltage over-voltage after on-position feedforward.
Description of symbols:
100- DC voltage controller forward path；110- direct current voltage regulator；120- current controller；130- direct current
Side；210- DC voltage regulation module；220- current control module；230- DC side module；250- current compensation node；500-
On-position feed-forward module；600- braking feedforward node.
Specific embodiment
The feature and exemplary embodiment of various aspects of the invention is described more fully below.In following detailed description
In, many details are proposed, in order to provide complete understanding of the present invention.But to those skilled in the art
It will be apparent that the present invention can be implemented in the case where not needing some details in these details.Below to implementation
The description of example is used for the purpose of providing by showing example of the invention and better understanding of the invention.The present invention never limits
In any concrete configuration set forth below and algorithm, but cover under the premise of without departing from the spirit of the present invention element,
Any modification, replacement and the improvement of component and algorithm.In the the accompanying drawings and the following description, well known structure and skill is not shown
Art is unnecessary fuzzy to avoid causing the present invention.
Fig. 3 A is a kind of typical wind generator system direct current ring control system architecture figure, and Fig. 3 B is control system shown in Fig. 3 A
It unites corresponding equivalent transfer function block diagram.Wherein, control purpose is to maintain DC voltage VdcFor given value, control object is to become
Flow the DC side 130 of device.DC voltage controller forward path 100 successively includes direct current voltage regulator 110, equivalent transmitting
Function is G '1；Current controller 120, equivalent transfer function are G '2；And DC side 130, equivalent transfer function are G '3。
Wherein, DC side G '3The DC voltage V of outputdcThrough negative-feedback and reference voltageIt is compared, difference DELTA VdcAs straight
The input of current-voltage regulator 110.
Direct current voltage regulator 110 generally chooses pi regulator, i.e. its equivalent transfer function form isWherein Kp、KiIt is the ratio and integral coefficient of pi regulator.Direct current difference DELTA VdcBy DC voltage
Watt current d axis given value is obtained after adjuster 110Practical d shaft current I is obtained using current controller 120d, pass through
DC-side equivalent model G '3Obtain actual DC voltage Vdc.In order to protrude purport, the knot of the not set complexity of current controller 120
Structure takes G '2=1.G′3Indicate the current integration link that DC bus capacitor C is constituted,
Obvious, the DC bus-bar voltage control mode of Fig. 1 and the prior art shown in Fig. 2 can also use the control of Fig. 3 A, 3B
System structure processed describes.As voltage adjust executing agency, generally can include concatenated switching power devices and resistance R,
" discharging circuit " of example as shown in figure 1 will name concatenated switch power in conjunction with the purpose of the present invention and means in the disclosure
Device and resistance R mono- more appropriate appellation " DC side brake apparatus ".Wherein, switching power devices generally use insulated-gate type
Bipolar transistor IGBT.
In this univoltage ring control structure, the movement of DC side brake apparatus is by Δ VdcControl, but its act
Influence of the result to DC voltage do not reflect directly but in DC control ring, what the output of G ' 1 more embodied
It is influence of its " off-load " effect to electric current.Therefore DC side brake apparatus start and stop occur the problem that (1) by
DC voltage declines after DC side energy is absorbed by DC side brake apparatus, and controller does not play it to DC voltage mistake
The integral action of difference, therefore DC voltage can be drawn high by the energy that pusher side injects again in the DC side brake apparatus stop timing,
DC side brake apparatus perseveration is caused, the wide fluctuations of DC voltage are caused；(2) direct current ring output current-order not
It is able to reflect real DC side energy output demand, electric current was regulated the speed slowly.
The state feedback that the present invention introduces DC side brake apparatus in existing Control system architecture is asked to solve these
Topic.Fig. 4 is the structural block diagram of the DC bus-bar voltage control system of the embodiment of the present invention.Wherein, straight in the embodiment of the present invention
Flowing busbar voltage control system includes the DC voltage regulation module 210 similar with structure shown in Fig. 3 A, 3B, current control mould
Block 220 and DC side module 230.DC bus-bar voltage control system further includes on-position feed-forward module 500, DC side
Voltage VdcWith an on-position parameter DcAfter multiplication, it is input to on-position feed-forward module 500, on-position feed-forward module 500
Output as braking compensation electric current Ic.Current compensation node is set between current control module 220 and DC side module 230
250, braking compensation electric current IcThe feed-in current compensation node 250 in the form of feedovering, the output I with current control module 220dIt makes the difference
Input direct-current side form block 230 afterwards.Above-mentioned on-position parameter DcFor the dynamic parameter for characterizing DC side brake apparatus action state；
On-position feed-forward module 500 is according to on-position parameter DcCalculate braking compensation electric current IcComputing module.
Wherein, the equivalent transfer function G of DC voltage regulation module 2101Indicate, current control module 220 it is equivalent
Transmission function G2It indicates；The equivalent transfer function G of DC side module 2303It indicates.Also, what DC side module 230 exported
DC voltage VdcThrough negative-feedback and reference voltageIt is compared, difference DELTA VdcAs DC voltage regulation module 210
Input, to constitute negative voltage feedback channel.
Wherein, the transmission function of links is made of actual system and determines, in order to protrude purport of the invention, this
Place, still by taking one group of typical form as an example.Wherein Kp、KiIt is the ratio and integration system of pi regulator
Number；G2(s)=1；C is DC bus capacitor value.
Corresponding, the direct current bus voltage control method in the embodiment of the present invention introduces braking dress in voltage control loop
The state parameter variables D setc, to control DC bus-bar voltage.Specifically, direct current bus voltage control method includes
Following steps:
In step sl, the on-position parameter D of DC side brake apparatus is obtainedc。
In step s 2, according to on-position parameter DcWith DC voltage VdcCalculate braking compensation electric current Ic。
In step s3, braking is compensated into electric current IcElectric current I is exported as feedforward and current control module 220dIt compares.
In step s 4, by the output electric current I of current control module 220dElectric current I is compensated with brakingcDifference as direct current
The input of side form block 230.
Using the DC bus-bar voltage controller and its control method in the embodiment of the present invention, due to DC side brake apparatus
Influence to DC voltage is no longer to be purely by way of the disturbance of voltage control loop, but be embodied in voltage control by feed-forward mode
Among ring processed, to be influenced to offset, the oscillation of DC voltage and system in adjustment process when avoiding electric voltage exception
It is unstable.Meanwhile the direct current control by the addition of feed-forward mode and on-position feed-forward module, equivalent to increase auxiliary
Unit processed, the given speed of direct current ring output current-order are accordingly accelerated, and so that system is adjusted rapidity enhancing, to also increase
Into system performance.
In one example, step S2 can be refined as braking feedforward node 600 for on-position parameter DcWith direct current
Side voltage VdcMultiplication is done, by output braking compensation electric current I after on-position feed-forward module 500cFeed voltage control ring.Specifically
Implementation can be with are as follows: current compensation node 250, direct current are provided between current control module 220 and DC side module 230
Side voltage VdcWith on-position parameter DcBraking feedforward node 600 do multiplication after, be input to on-position feed-forward module 500 into
Row operation, the equivalent transfer function G of on-position feed-forward module 500fIt indicates, the output of on-position feed-forward module 500 is made
For current disturbing compensation rate Ic, current disturbing compensation rate IcThe feed-in current compensation node 250 in the form of feedovering, with current control mould
The output I of block 220dDC side module 230 is input to after making the difference.
Such as a preferable examples according to the present invention, the power device in DC side brake apparatus can select IGBT
(Insulated Gate Bipolar Transistor, insulated gate bipolar transistor), IGBT in DC side brake apparatus
Determine whether DC side brake apparatus is in running order whether conducting.On-position parameter DcIt is specifically as follows DC side braking
The turn-on time duty ratio D of devicechopper, DchopperSpecific value use stagnant ring comparison method, pass through actual DC voltage
VdcIt acquires.If the starting voltage of DC side brake apparatus is VlimitUp, stopping voltage is VlimitLow, wherein VlimitUp>
VlimitLow.As actual DC voltage Vdc> VlimitUpWhen, DC side brake apparatus starts, at the DC side brake apparatus
In working condition, D at this timechopper=1；As actual DC voltage Vdc< VlimitLowWhen, which is in
Off working state, at this time Dchopper=0.
On-position feed-forward module 500 is according to on-position parameter DcObtain compensation electric current IcFunctional module.According to control
The design parameter of purpose and system processed can design its equivalent transfer function GfDifferent algorithms and operational formula, the disclosure is herein
Provide one group of preferable embodiment.
In an example according to an embodiment of the present invention, when DC side brake apparatus is in running order, that is,
Say Dchopper=1, the equivalent transfer function of on-position feed-forward module 500Wherein, TsFor direct current
The duty cycle of switching of side brake apparatus corresponding clock cycle, RchopperFor the resistance of braking resistor in DC side brake apparatus
Value, kiFor integral constant, t is the time.Wherein, the duty cycle of switching of DC side brake apparatus is specific corresponding clock cycle
It can be the duty cycle of switching of the power device in DC side brake apparatus.When DC side brake apparatus is in running order,
According to the equivalent transfer function of on-position feed-forward module 500, available braking compensates electric current
In another example according to an embodiment of the present invention, when DC side brake apparatus switches to non-work from working condition
After making state, that is to say, that when DC side brake apparatus is in off working state, Dchopper=0, on-position feed-forward module
500 equivalent transfer functionWherein, Ic(tstop) it is that on-position feed-forward module 500 is cut
It is changed to braking compensation electric current at the time of off working state, kdTo exit feedforward time parameter, VdcFor DC voltage, tstopFor
The time that DC side brake apparatus stops working, t are time and tstop≤t≤kd.DC side brake apparatus switches to inoperative shape
After state, influence of the DC side brake apparatus to voltage control loop reduces, and can control the feedforward function of on-position feed-forward module 500
Entire DC bus-bar voltage control system can steadily be exited.With being gradually increased for time t,Value be gradually reduced, make
The equivalent transfer function G of dynamic state feedforward module 500fValue be also gradually reduced, the influence to DC side module 230 also gradually subtracts
Small, the feed forward function of control on-position feed-forward module 500 gradually steadily exits entire DC bus-bar voltage control system.Directly
To time t=kd, at this point, equivalent transfer function Gf=0, it is whole to show that the feed forward function of on-position feed-forward module 500 has logged out
A DC bus-bar voltage control system.
In another example according to an embodiment of the present invention, when DC side brake apparatus is in off working state, system
The equivalent transfer function G of dynamic state feedforward module 500f=0, wherein t is time and t > kd.That is, if time t > kd,
The feed forward function of on-position feed-forward module 500 has logged out entire DC bus-bar voltage control system, therefore before on-position
Present the equivalent transfer function G of module 500f=0.
Fig. 5 is the schematic diagram for being not introduced into the dynamic response process of DC voltage over-voltage of on-position feedforward.Fig. 6 is to draw
The schematic diagram of the dynamic response process of DC voltage over-voltage after entering on-position feedforward.It, will by the comparison of Fig. 5 and Fig. 6
It can be readily apparent that find out the advantage of DC bus-bar voltage control system and method used in the embodiment of the present invention.Wherein, direct current
When side brake apparatus is set in DC voltage and is more than 1200V, the starting of DC side brake apparatus, when being lower than 1100V, DC side system
Dynamic device stops, and to limit the voltage of DC side, prevents the overtension of DC side.DC side brake apparatus duty ratio indicates it
Starting state indicates starting for 1, indicates that shutdown stops for 0.
From figure 5 it can be seen that before on-position feedforward introduces direct current pressure ring, from the continuous jump of DC side brake apparatus duty ratio
It moves visible DC side brake apparatus and starts stopping repeatedly, and DC voltage wide fluctuations between 1100V and 1200V, until
DC voltage is just stablized to given value 1100V after watt current gives to -1000A.This DC voltage fluctuation and
The dynamic process that power device in DC side brake apparatus constantly acts causes system extremely unstable, not only to DC voltage tune
Section process is unfavorable, and the control and equipment to whole wind power generating set will also result in harm.And in the dynamic process of Fig. 6, when straight
When galvanic electricity pressure is higher than 1200V, DC side brake apparatus starting, after starting is primary, because of the on-position of DC side brake apparatus
The addition of feedforward, so that watt current is given to be rapidly reached -1000A, DC voltage is then stable and to be slowly adjusted to 1100V attached
Closely, do not occur wide fluctuations, DC side brake apparatus is not also again started up.
DC bus-bar voltage control system and its control method in the embodiment of the present invention can be applied in wind-power electricity generation system
On wind electric converter in system, but it is not limited to this.
From above analysis and comparison as it can be seen that the influence due to DC side brake apparatus to DC voltage is no longer simple
It as the disturbance of voltage control loop, but is embodied among control ring by feed-forward mode, to be influenced to offset, avoids
When electric voltage exception in adjustment process the oscillation of DC voltage and system it is unstable.Meanwhile passing through feed-forward mode, and system
The addition of dynamic state feedforward module, equivalent to increase the DC control unit of auxiliary, direct current ring exports what current-order gave
Speed is accordingly accelerated, and so that system is adjusted rapidity enhancing, to also enhance system performance.
Functional block shown in above structural block diagram can be implemented as hardware, software, firmware or their combination.When
It is equal to the corresponding equivalent transfer function of module as judgment basis using its effect.Disclosure overwhelming majority embodiment is with transmission function
The continuous system mode of form carries out System describe, it will be clear that corresponding system discrete form and discrete control mode will not
It is detached from Spirit Essence of the invention, can equally fall into protection scope of the present invention.
When realizing in hardware, electronic circuit, specific integrated circuit (ASIC), appropriate solid may, for example, be
Part, plug-in unit, function card etc..When being realized with software mode, element of the invention is used to execute the program of required task
Or code segment.Perhaps code segment can store in machine readable media program or the data by carrying in carrier wave are believed
It number is sent in transmission medium or communication links." machine readable media " may include be capable of storage or transmission information any
Medium.
More than, only a specific embodiment of the invention, but scope of protection of the present invention is not limited thereto, and it is any to be familiar with
Those skilled in the art in the technical scope disclosed by the present invention, can readily occur in various equivalent modifications or substitutions,
These modifications or substitutions should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be wanted with right
Subject to the protection scope asked.
Claims (11)
1. a kind of DC bus-bar voltage control system, comprising: DC voltage regulation module (210), the current control being sequentially connected in series
Module (220) and DC side module (230), the DC voltage V of DC side module (230) outputdcThrough negative-feedback and with reference to electricity
PressureIt is compared, input of the difference as DC voltage regulation module (210), which is characterized in that the control system is also wrapped
It includes:
On-position feed-forward module (500), DC voltage VdcWith on-position parameter DcAfter multiplication, it is input to the braking shape
State feed-forward module (500), the output of the on-position feed-forward module (500) is as braking compensation electric current Ic；
The current compensation node (250) being arranged between current control module (220) and DC side module (230), the braking
Compensate electric current IcThe feed-in current compensation node (250) in the form of feedovering, the output I with current control module (220)dIt makes the difference rear defeated
Enter DC side module (230)；
Wherein, on-position parameter DcFor the dynamic parameter for characterizing DC side brake apparatus action state, the on-position parameter
DcFor the turn-on time duty ratio D of the DC side brake apparatuschopper；On-position feed-forward module (500) is according to braking shape
State parameter DcCalculate braking compensation electric current IcComputing module.
2. system according to claim 1, which is characterized in that wherein, the DC side brake apparatus is in running order
When Dchopper=1, D when the DC side brake apparatus is in off working statechopper=0.
3. system according to claim 1, which is characterized in that when the DC side brake apparatus is in running order,
The equivalent transfer function of the on-position feed-forward module (500)Wherein, TsFor DC side braking
The duty cycle of switching of device corresponding clock cycle, RchopperFor the resistance value of braking resistor in DC side brake apparatus, kiFor
Integral constant, t are the time.
4. system according to claim 1, which is characterized in that when the DC side brake apparatus is in off working state
When, the equivalent transfer function of the on-position feed-forward module (500)Wherein, Ic
(tstop) it is that braking at the time of on-position feed-forward module (500) are switched to off working state compensates electric current, kdTo exit feedforward
Time parameter, VdcFor DC voltage, tstopFor the time that the DC side brake apparatus stops working, t is time and tstop
≤t≤kd。
5. system according to claim 4, which is characterized in that when the DC side brake apparatus is in off working state
When, the equivalent transfer function G of the on-position feed-forward module (500)f=0, wherein t is time and t > kd。
6. a kind of direct current bus voltage control method, which is characterized in that DC bus-bar voltage control loop includes: DC voltage tune
Save module (210), current control module (220), DC side module (230) and on-position feed-forward module (500), direct current side form
The DC voltage V of block (230) outputdcThrough negative-feedback and reference voltageIt is compared, difference is as DC voltage regulation mould
The input of block (210),
Direct current bus voltage control method the following steps are included:
Obtain the on-position parameter D of DC side brake apparatusc, the on-position parameter DcFor leading for DC side brake apparatus
Logical duty ratio of time Dchopper；
According to on-position parameter DcWith DC voltage VdcCalculate braking compensation electric current Ic；
Braking is compensated into electric current IcElectric current I is exported as feedforward and current control module (220)dIt compares；
Current control module (220) are exported into electric current IdElectric current I is compensated with brakingcDifference as the defeated of DC side module (230)
Enter.
7. according to the method described in claim 6, wherein, D when the DC side brake apparatus is in running orderchopper=1,
D when the DC side brake apparatus is in off working statechopper=0.
8. according to the method described in claim 6, it is characterized in that, in the on-position parameter D for obtaining DC side brake apparatusc
The step of in, by on-position feed-forward module (500) calculate braking compensation electric current Ic, by on-position parameter DcWith DC side electricity
Press VdcIt is multiplied, and using product as the input of the on-position feed-forward module (500), the on-position feed-forward module
(500) output is braking compensation electric current Ic。
9. according to the method described in claim 6, it is characterized in that, when the DC side brake apparatus is in running order,
The equivalent transfer function of the on-position feed-forward module (500)Wherein, TsFor DC side braking
Power device duty cycle of switching corresponding clock cycle, R in devicechopperFor braking resistor in DC side brake apparatus
Resistance value, kiFor integral constant.
10. according to the method described in claim 6, it is characterized in that, when the DC side brake apparatus is in off working state
When, the equivalent transfer function of the on-position feed-forward module (500)Wherein, Ic
(tstop) it is that braking at the time of on-position feed-forward module (500) are switched to off working state compensates electric current, kdTo exit feedforward
Time parameter, VdcFor DC voltage, tstopFor the time that the DC side brake apparatus stops working, and tstop≤t≤kd。
11. according to the method described in claim 10, it is characterized in that, when the DC side brake apparatus is in off working state
When, the equivalent transfer function G of the on-position feed-forward module (500)f=0, wherein t > kd。
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