CN108667322A - single-phase rectifier control method and system - Google Patents
single-phase rectifier control method and system Download PDFInfo
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- CN108667322A CN108667322A CN201810508778.1A CN201810508778A CN108667322A CN 108667322 A CN108667322 A CN 108667322A CN 201810508778 A CN201810508778 A CN 201810508778A CN 108667322 A CN108667322 A CN 108667322A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- Rectifiers (AREA)
Abstract
A kind of single-phase rectifier control method of present invention proposition and control system.Single-phase rectifier is controlled using outer voltage, current inner loop double -loop control in combination with SOGI, and SOGI control units receive AC-input voltage, the input as SOGI control units；The output of SOGI control units and the feedback quantity of DC output voltage compare, the input as outer voltage control unit；Input of the output of outer voltage control unit as current inner loop control unit.This method and system are introduced locking phase control, can be improved locking phase precision and efficiency, reduce the total harmonic distortion factor of input current, while reduce inrush current based on traditional Double-loop Control Strategy.
Description
Technical field
The present invention relates to technical field of electric control more particularly to a kind of single-phase rectifier control methods and system.
Background technology
Important component of the single-phase rectifier as power supply system of train is connection power supply network and rear class equipment and load
Deng intermediate bridge, performance quality it is most important to the safe and stable operation of train.Single-phase rectifier is controlled
When, since electrical waveform sampling is single-phase, thus when being coordinately transformed with locking phase, exist centainly with three-phase system compared with
Difficulty, especially in the occasion more demanding to accuracy and speed；In addition with the increase of load, the secondary wave of DC bus-bar voltage
It is dynamic the safe and stable operation and input current quality of system to be had an impact.
Outer voltage, current inner loop double loop control are the common control method of single-phase rectifier, which adopts
Realize that the realization of control function, the selection of PI control parameters are most important for equipment runnability with PI controllers.But it is based on
Traditional double loop control can not solve the problems, such as to be reduced by the control accuracy that single-phase electrical waveform is brought.
Invention content
The purpose of the present invention is to provide a kind of control method of single-phase rectifier and system, this method and system are based on passing
The Double-loop Control Strategy of system introduces locking phase control, can improve locking phase precision and efficiency, reduce total harmonic distortion of input current
Rate, while reducing inrush current.
To achieve the goals above, the present invention provides the following technical solutions：
A kind of single-phase rectifier control method is used for the control of single-phase rectifier, and single-phase rectifier is using outer voltage, electricity
Inner ring double -loop control is flowed, is included the following steps：
SOGI transmission functions are defined for SOGI control units：
Wherein, ω is resonant frequency, is equal to single-phase rectifier AC input voltage angular speed；
Then, the closed loop transfer function, of single-phase rectifier system is after introducing phaselocked loop：
Wherein, k is bandwidth contributions factor；
Sliding-model control is carried out to SOGI transmission functions using three rank integrators,
Wherein, y (n) is sample array Y n-th point, and u (n) is sample array U n-th point, and Ts is the sampling period.
And then：
Wherein I1、I2And I3For integrator discretization factor；
Park transformation is carried out to the SOGI transmission functions after sliding-model control；
Park transformation for mula is：
Wherein, d, q are respectively each coordinate axis component under dq coordinate systems, and α, β are respectively each coordinate axis component under α β coordinate systems,
ω t are angle of the dq coordinate systems relative to α β coordinate systems.
Output after Park transformation is compared with q shaft voltage given values, the input as phase lock control；
Input of the output of SOGI control units as outer voltage control unit.
As preferred：Further comprise the steps：DC voltage increases the method for compensation to eliminate due to secondary fluctuation
Caused alternating current harmonic wave feeds back to outer voltage control by single-phase rectifier DC side output voltage plus after offset voltage
The input terminal of system, with voltage I change control input voltage subtract each other after the input that is controlled as outer voltage, the offset voltage
For：
Wherein, Δ u indicates offset voltage,Indicate that direct-current secondary fluctuation voltage, C indicate single-phase rectifier input terminal electricity
Hold, UmFor input voltage peak value, ImFor input current peak value.
As preferred：Further comprise the steps：Amplitude limit control is carried out to the output of outer voltage control unit, in turn
Realize the inhibition to inrush current.
As preferred：When carrying out amplitude limit control, by the output valve U of single-phase rectifier DC sideoutWith desired output
It is compared：
IfUsingAmplitude limit control is carried out to starting current；
IfUsingAmplitude limit control is carried out to starting current；
Wherein,For the output of outer voltage control unit, IdFor single-phase rectifier starting current.
The present invention further provides a kind of single-phase rectifier control system, including controller, the controller includes voltage
Outer loop-control unit and current inner loop control unit further comprise SOG I control units and sampling unit, the sampling unit
Acquire single-phase rectifier AC input current, AC-input voltage and DC output voltage；
SOGI control units receive AC-input voltage, the input as SOGI control units；
The output of SOGI control units and the feedback quantity of DC output voltage compare, as outer voltage control unit
Input；
Input of the output of outer voltage control unit as current inner loop control unit.
As preferred：Controller further comprises that harmonic controling unit, the harmonic controling unit generate harmonic controling electricity
Signal, the harmonic controling voltage signal is pressed to export to the feedback end of DC output voltage, the feedback quantity with DC output voltage
After addition, further compared with the output of SOGI control units, the input as outer voltage control unit.
As preferred：Controller further includes that electric current inhibits unit, the electric current inhibit unit obtain AC-input voltage and
DC output voltage, and further comprise the voltage comparison module for comparing AC-input voltage and DC output voltage, and
The inhibition signal generation module that electric current inhibits signal is generated according to voltage comparison module result.
Compared with prior art, the advantages and positive effects of the present invention are：
The invention propose based on secondary improper integral (Second Order Generalized Integrator,
SOGI the single-phase rectifier control method of train), can improve locking phase precision and efficiency.Basic control method is outer voltage
With the double -loop control of current inner loop, have that intermediate dc bus voltage stabilization, exchange input side power factor be controllable, load sudden change
When dynamic response it is quick the features such as；Particular harmonic is added and eliminates control, reduces the total harmonic distortion factor of input current；Incorporate electric current
Inhibit control, reduces inrush current.
Description of the drawings
Fig. 1 is Single-phase PWM Rectifier main circuit topology figure in the prior art；
Fig. 2 is Single-phase PWM Rectifier double -loop control schematic diagram；
Fig. 3 is single-phase rectifier control flow chart；
Fig. 4 is single-phase rectifier exchange side stable state vector correlation figure；
Fig. 5 is SOGI control principle drawings；
Fig. 6 is the three rank integrator schematic diagrams that discretization is carried out to SOGI；
Fig. 7 is phase lock control schematic diagram；
Fig. 8 is that particular harmonic eliminates control principle drawing；
Fig. 9 is that inrush current inhibits tactful block diagram；
Figure 10 is unipolarity modulation principle figure；
Figure 11 is DC bus-bar voltage oscillogram；
Figure 12 is rectifier exchange side voltage and current waveform；
Figure 13 is the locking phase oscillogram based on SOGI；
Figure 14 is single-phase rectifier full load alternating voltage and current waveform figure.
Wherein, 1- modulating waves, 2- carrier waves, 3- reverse phase modulating waves, 4- pre-charging stages, 5- soft start stages, 6- run rank
Section, 7- AC-input voltages, 8- DC bus-bar voltages, 9- AC input currents, 10- inrush currents。
Specific implementation mode
Hereinafter, the specific implementation mode of the present invention is further described in conjunction with attached drawing.
Present invention firstly provides a kind of control methods of single-phase rectifier, are used for the control of single-phase rectifier.The present invention
The control method of offer is a kind of train single-phase rectifier control method based on secondary improper integral, can improve locking phase essence
Degree and efficiency.
Single-phase rectifier includes PWM rectification circuits, and PWM rectification main circuits topological structure is as shown in Figure 1, include single-phase full bridge
IGBT rectification units, including ac input division point and direct current output part, ac input division, which sets up separately, is equipped with inductance and resistance, directly
Stream output par, c is provided with storage capacitor.This part is the prior art, and details are not described herein again.
The control flow of single-phase rectifier is as shown in Figure 3.
1. single-phase rectifier realizes voltage transformation using single-phase full bridge pwm converter, input ac voltage, output stabilization can
The DC voltage of tune.
2. single-phase rectifier normal operation flow：Fault detect is carried out first, after meeting entry condition, by resistance to straight
Flow busbar into line precharge, at the end of cut off resistance, into starting state, start PWM rectifications, wait for that DC bus-bar voltage meets item
After part, into the operation phase, meets different load behavior control, realize the operation of exchange side unity power factor.
3. sensor acquires single-phase rectifier input ac voltage, input AC electric current, output DC voltage and is used as feedback,
Start operational process judgement, locking phase control and PI controls for single-phase rectifier.
4. the normal Booting sequence of single-phase rectifier：
1- wait for, into horizontal lock control, to input voltage, input current, output voltage and device element state etc. into
Row detection, reaches entry condition and enters the next stage；
2- is pre-charged, and pre-charge contactor is closed, and is charged to DC bus-bar voltage by resistance, after a period of time
(precharge time), and DC bus-bar voltage reaches certain numerical value, is closed main contactor, pre-charge resistance is cut off, under
One stage；
3- starts, and opens PWM rectifications, and control DC bus-bar voltage enters next stage to reference value；
4- is run, control exchange side unity power factor operation, and is controlled Harmonics of Input, is met different negative
Duty requirements are carried, DC bus-bar voltage is maintained to stablize.
To there are two types of the PWM modulation modes of exchange side fundamental voltage control, i.e. unipolarity modulation and bipolar modulation.Same
When, the harmonic component of unipolarity modulation ratio bipolar modulation is smaller, and control is relative complex, and the present invention uses unipolarity
Modulation.When using unipolarity modulation, exchange side voltage is in Ud, 0 and 0 ,-UdBetween convert, specific modulating wave 1, carrier wave 2, reverse phase tune
The waveform of wave 3 processed is as shown in Figure 10.If carrier frequency is fz, then UaAnd UbFundamental frequency is fz, obtain UabFundamental wave realizes frequency multiplication effect
Fruit, frequency become 2fz。
Double -loop control exports after coordinate transform, obtains UabReference waveform, as PWM modulation wave, using unipolarity tune
System generates four tunnel PWM waves as single-phase full bridge rectifier drive signal.Work as UaWhen being high, control IGBT1 conductings, IGBT2 is therewith
Complementation conducting, works as UbWhen being high, control IGBT3 conductings, IGBT4 complementary conductings therewith.
When current transformer runs on rectification mode, exchange side stable state vector correlation is as shown in Figure 4.It is opened by controlling IGBT
It closes, adjusts Uab amplitudes and phase, to control the voltage on inductance L, the final pass for adjusting AC input voltage and electric current
System, to realize the control of power factor.
Loop equation is obtained by Kirchhoff's second law：Uin=UL+Uab.Wherein, Uin is AC input voltage, and UL is
Inductor both end voltage, Uab are exchange side module voltage.
Voltage and current relationship on inductance：Wherein, iin is exchange side input current, and L is input inductance.
It is obtained by upper two formula：
Under d-q coordinate systems, exchange side mathematical model (having ignored exchange side resistance) is obtained：
Wherein, uabd、uabqFor the d-q components of module input voltage, uind、uinqFor the d-q components of AC input voltage,
iind、iinqFor the d-q components of exchange side input current, ω is AC input voltage angular speed.
Single-phase rectifier is using single-phase rectifier using outer voltage, current inner loop double -loop control, list provided by the invention
Commutating phase device control method innovation is further to add SOGI controls on the basis of double -loop control, by single phase ac
Sampling obtains two and can be used for the amount of quadrature of Park Transformation, and then obtains d-q components to realize locking phase and control, to improve lock
Phase precision and efficiency.SOGI control principles are as shown in figure 5, include the following steps：
SOGI transmission functions are defined for SOGI control units：
Wherein, ω is resonant frequency, is equal to single-phase rectifier AC input voltage angular speed；
Then, the closed loop transfer function, of single-phase rectifier system is after introducing phaselocked loop：
Wherein, k is bandwidth contributions factor；
Sliding-model control is carried out to SOGI transmission functions using three rank integrators,
Wherein, y (n) is sample array Y (output of SOGI transmission functions) n-th point, and u (n) is sampling array U
N-th point of (input of SOGI transmission functions), Ts is the sampling period.
And then：
Wherein I1、I2And I3For integrator discretization factor；
The control principles of three rank integrators is as shown in fig. 6, in the present embodiment, I1、I2And I3Respectively 23,26 and 5, therefore,
Formula (5) is：
Park transformation is carried out to the SOGI transmission functions after sliding-model control；
Park transformation for mula is：
Wherein, d, q are respectively each coordinate axis component under dq coordinate systems, and α, β are respectively each coordinate axis component under α β coordinate systems,
ω t are angle of the dq coordinate systems relative to α β coordinate systems.
Output after Park transformation is compared with q shaft voltage given values, as the input of phase lock control, locking phase control principle
As shown in Figure 7；
Input of the output of SOGI control units as outer voltage control unit.
Controller design shown in Fig. 7 is PI controllers, realizes the decoupling of d-q components, and outer voltage is added and realizes direct current
Voltage Stability Control obtains outer voltage and current inner loop double -loop control block diagram such as Fig. 1.The output of outer voltage is as current inner loop
The reference of d axis, q axis according to power factor with reference to setting, when unity power factor,
PI link transmission functions：
The domains PI controller z transmission function：
Wherein, KPFor ratio control parameter, KIFor integration control parameter.
And then obtain DSP difference equations easy to implement：
Further, control method further includes Harmonics elimination rate-determining steps.
When single-phase rectifier is controlled as unity power factor operation, alternating current-direct current side power is respectively：
Wherein, ImFor exchange side input current peak value, UmFor AC input voltage peak value.
According to the conservation of energy, and system is stablized, i.e., power is equal, obtains：I.e.：
As it can be seen that when using outer voltage as shown in Figure 1,2 secondary undulations can be introduced into electric current d axis existing for DC side
With reference in, and then alternating current harmonic wave is caused to increase.
Therefore, the control method of single-phase rectifier provided by the invention controls the elimination for carrying out harmonic wave.
Include the following steps：The method that DC voltage increases compensation is humorous to eliminate the alternating current caused by secondary fluctuation
Wave feeds back to the input terminal of outer voltage control, with voltage by single-phase rectifier DC side output voltage plus after offset voltage
I change control input voltage subtract each other after the input that is controlled as outer voltage, the offset voltage is：
Wherein, Δ u indicates offset voltage,Indicate that direct-current secondary fluctuation voltage, C indicate single-phase rectifier input terminal electricity
Hold, UmFor input voltage peak value, ImFor input current peak value.Offset voltage is alternatively referred to as harmonic controling voltage, with reference to figure 8, the electricity
Pressure will be combined with single-phase rectifier DC side output voltage, the input as outer voltage control.
Further, control method provided by the invention further includes the inhibition step of dash current.
Due to the effect of current inner loop,Therefore size of current and IdIt is related, and when rectifier startup, in order in
Between DC voltage can rise to reference value, necessarily lead to big alternating current, the present invention is by rationally controllingIt realizes to opening
The control of streaming current.Because dash current occurs on startup, so need to only be carried out before DC bus-bar voltage is not up to reference value
Inhibition, control block diagram such as Fig. 9.By carrying out amplitude limit control to reference current, the control to dash current is realized.
Specifically include following steps：
When carrying out amplitude limit control, by the output valve U of single-phase rectifier DC sideoutWith desired outputIt is compared：
IfUsingAmplitude limit control is carried out to starting current；
IfUsingAmplitude limit control is carried out to starting current；
Wherein,For the output of outer voltage control unit, IdFor single-phase rectifier starting current.
By the control method of the above single-phase rectifier, single-phase rectifier high-precision control may be implemented, while eliminating spy
Fixed harmonic wave inhibits inrush current, and then can reduce the aberration rate of input current, reduces inrush current.
The present invention further provides a kind of single-phase rectifier control system, which can perform controlling party described above
The function of method is used for the control of single-phase rectifier.
Single-phase rectifier control system includes controller, and controller includes outer voltage control unit and current inner loop control
Unit further comprises that SOGI control units and sampling unit, sampling unit acquire single-phase rectifier AC input current, exchange
Input voltage and DC output voltage；
SOGI control units receive AC-input voltage, the input as SOGI control units；
The output of SOGI control units and the feedback quantity of DC output voltage compare, as outer voltage control unit
Input；
Input of the output of outer voltage control unit as current inner loop control unit.
Controller further comprises harmonic controling unit, and harmonic controling unit generates harmonic controling voltage signal, described humorous
Wave control voltage signal is exported to the feedback end of DC output voltage, after being added with the feedback quantity of DC output voltage, further
Compared with the output of SOGI control units, the input as outer voltage control unit.
Controller further includes that electric current inhibits unit, the electric current that unit is inhibited to obtain AC-input voltage and direct current output electricity
Pressure, and further comprise the voltage comparison module for comparing AC-input voltage and DC output voltage, and according to voltage ratio
The inhibition signal generation module that electric current inhibits signal is generated compared with module results.
Control to single-phase rectifier is used for, it can be achieved that single-phase whole using control method provided by the invention and control system
Flow device smooth starting and operation.During single-phase rectifier is started and run, DC bus-bar voltage is as shown in figure 11, can from figure
See, from pre-charging stage 4, to the soft start stage 5 again to the operation phase 6, the not big wave of DC bus-bar voltage in whole process
Dynamic, single-phase rectifier operates steadily.
Single-phase rectifier inrush current is as shown in figure 12, and in conjunction with Figure 11, soft-start time is 0.5s or so, it is seen then that
Inrush current 10 small 100A is substantially close with size when zero load.
The locking phase wave effect for adding SOGI control units is as shown in figure 13, and as seen from Figure 13, locking phase works well.
Single-phase rectifier full load exchange side voltage, current waveform figure are as shown in figure 14.As seen from Figure 14, exchange input electricity
Pressure 7, DC bus-bar voltage 8,9 three of AC input current fluctuation are small, and 3.5% or so, operation is flat for middle dc voltage fluctuation
Surely.
To sum up, control method of the invention and control effect can realize preferable control effect, ensure that single-phase rectifier is flat
Steady operation.
The above described is only a preferred embodiment of the present invention, being not that the invention has other forms of limitations, appoint
What those skilled in the art changed or be modified as possibly also with the technology contents of the disclosure above equivalent variations etc.
It imitates embodiment and is applied to other fields, but it is every without departing from technical solution of the present invention content, according to the technical essence of the invention
To any simple modification, equivalent variations and remodeling made by above example, the protection domain of technical solution of the present invention is still fallen within.
Claims (7)
1. a kind of single-phase rectifier control method is used for the control of single-phase rectifier, single-phase rectifier is using outer voltage, electric current
Inner ring double -loop control, which is characterized in that include the following steps：
SOGI transmission functions are defined for SOGI control units：
Wherein, ω is resonant frequency, is equal to single-phase rectifier AC input voltage angular speed；
Then, the closed loop transfer function, of single-phase rectifier system is after introducing phaselocked loop：
Wherein, k is bandwidth contributions factor；
Sliding-model control is carried out to SOGI transmission functions using three rank integrators,
Wherein, y (n) is sample array Y n-th point, and u (n) is sample array U n-th point, and Ts is the sampling period.
And then：
Wherein I1、I2And I3For integrator discretization factor；
Park transformation is carried out to the SOGI transmission functions after sliding-model control；
Park transformation for mula is：
Wherein, d, q are respectively each coordinate axis component under dq coordinate systems, and α, β are respectively each coordinate axis component, ω t under α β coordinate systems
Angle for dq coordinate systems relative to α β coordinate systems.
Output after Park transformation is compared with q shaft voltage given values, the input as phase lock control；
Input of the output of SOGI control units as outer voltage control unit.
2. single-phase rectifier control method as described in claim 1, which is characterized in that further comprise the steps：Direct current
Voltage increases the method for compensation to eliminate the alternating current harmonic wave caused by secondary fluctuation, and single-phase rectifier DC side is exported
Voltage add offset voltage after, feed back to outer voltage control input terminal, with voltage I change control input voltage subtract each other after
As the input of outer voltage control, the offset voltage is：
Wherein, Δ u indicates offset voltage,Indicate that direct-current secondary fluctuation voltage, C indicate single-phase rectifier input end capacitor, Um
For input voltage peak value, ImFor input current peak value.
3. single-phase rectifier control method as described in claim 1, it is characterised in that：Further comprise the steps：To electricity
It presses the output of outer loop-control unit to carry out amplitude limit control, and then realizes the inhibition to inrush current.
4. single-phase rectifier control method as claimed in claim 4, it is characterised in that：It, will be single-phase whole when carrying out amplitude limit control
Flow the output valve U of device DC sideoutWith desired outputIt is compared：
IfUsingAmplitude limit control is carried out to starting current；
IfUsingAmplitude limit control is carried out to starting current；
Wherein,For the output of outer voltage control unit, IdFor single-phase rectifier starting current.
5. single-phase rectifier control system, including controller, the controller includes outer voltage control unit and current inner loop
Control unit, it is characterised in that：Further comprise that SOGI control units and sampling unit, the sampling unit acquire single-phase rectifier
Device AC input current, AC-input voltage and DC output voltage；
SOGI control units receive AC-input voltage, the input as SOGI control units；
The output of SOGI control units and the feedback quantity of DC output voltage compare, as the defeated of outer voltage control unit
Enter；
Input of the output of outer voltage control unit as current inner loop control unit.
6. single-phase rectifier control system as claimed in claim 5, it is characterised in that：The controller further includes harmonic controling
Unit, the harmonic controling unit generate harmonic controling voltage signal, and the harmonic controling voltage signal is exported to direct current output
The feedback end of voltage after being added with the feedback quantity of DC output voltage, further compared with the output of SOGI control units, is made
For the input of outer voltage control unit.
7. single-phase rectifier control system as claimed in claim 5, it is characterised in that：The controller further includes that electric current inhibits
Unit, the electric current inhibits unit to obtain AC-input voltage and DC output voltage, and further comprises comparing exchange
The voltage comparison module of input voltage and DC output voltage, and electric current is generated according to voltage comparison module result and inhibits signal
Inhibit signal generation module.
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| CN109600090A (en) * | 2018-12-07 | 2019-04-09 | 中车青岛四方车辆研究所有限公司 | Double-fed generator current transformer control algolithm and system |
| CN110793405A (en) * | 2019-09-16 | 2020-02-14 | 上海航天控制技术研究所 | Self-adaptive control method for preventing instantaneous impact of unfolding of folding rudder of electric steering engine |
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