CN104868757B - Method for estimating initial value of virtual flux linkage vector of PWM rectifier - Google Patents
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Abstract
The invention discloses a method for estimating an initial value of a virtual flux linkage vector of a PWM rectifier. During the moment when a state is about to be switched to a PWM rectification state, a quasi-switching stage is added, and a three-phase bypass contactor still remains disconnected at the quasi-switching stage. A zero-vector PWM signal is applied to the PWM rectifier under the condition that a current-limiting resistor continues to inhibit a loop current, so as to probe and estimate the initial value of the virtual flux linkage vector. The position and size of the virtual flux linkage vector are obtained through probing at the quasi-switching stage, and the subsequent on-line estimation of the virtual flux linkage vector is continued through a software phase-locking loop till the three-phase bypass contactor is closed, thereby truly switching to a moment of controllable rectification stage. The software phase-locking loop provides the initial value information of the virtual flux linkage vector for a PWM rectification control algorithm. The method is easy to implement, and is good in reliability.
Description
Technical field
The invention belongs to Technics of Power Electronic Conversion control technology field, is related to a kind of PWM rectifier Virtual shipyard vector initial value
Evaluation method.
Background technology
PWM rectifier can reconcile DC voltage stability because having the advantages that energy capable of bidirectional flowing, power factor, substantial amounts of
More and more by PWM rectifier as key device, such as uninterrupted power source, four-quadrant becomes frequency modulation to applied power electronics occasion
The technology of generating electricity by way of merging two or more grid systems such as fast, direct current transportation and wind-power electricity generation, photovoltaic generation.Therefore, PWM rectifier and its control technology are carried out
Research, it is significant.
In practical application, need to detect three-phase power grid voltage, electric current and the DC bus-bar voltage of PWM rectifier, it is additional to set
The numerous sensors put and its signal conditioning circuit, increased cost and system complexity.Therefore, reduce PWM rectifier cost
Become one of hot issue of everybody concern.
The DC bus-bar voltage sensor of PWM rectifier and power network current sensor participate in control and protect, general unsuitable
Delete, in application it is most be sensorless scheme.For the PWM rectifier of Virtual shipyard oriented control,
Integral operation need to be used when observing due to Virtual shipyard, if controller is switching to the controlled rectification stage by uncontrollable rectifier state
When, it is impossible to there is deviation in the initial position angle and initial size, i.e. vector initial value for accurately obtaining Virtual shipyard, then can make virtual magnetic
There is lasting deviation in chain observation, brings PWM rectifier control performance to decline even because the shutdown of dash current causing trouble cannot
The normal problem for starting.Therefore, after saving grid voltage sensor in the PWM rectifier of Virtual shipyard oriented control, virtually
The estimation of flux linkage vector initial value is particularly important.
Up to the present, the research in terms of relevant Virtual shipyard orientation PWM rectifier has focused largely on how to improve virtual
The skew of integral operation and oscillation problem in flux observation, and with regard to how accurately to obtain Virtual shipyard vector initial value report very
It is few.
Hou Zhao is so waited in the 21st phase of November in 2014《Protecting electrical power system and control》On deliver it is " fixed based on Virtual shipyard
To PWM rectifier control method research " one the article pointed out it is accurate observation Virtual shipyard angle importance, and propose by
The anti-windup saturation thought of PID controller is transplanted in the integral operation of Virtual shipyard observation.The major defect of this method has：
1) need rationally to arrange the output violent change value of Virtual shipyard；2) fundamentally do not solve Virtual shipyard vector initial position angle to see
The problem of survey, it is impossible to ensure the accuracy of Virtual shipyard observation in start-up course.Therefore, still deposit
The possibility of stream.
Li Huaming etc. is in the 3rd phase of March in 2015《Power Electronic Technique》On " the three-phase of sensorless delivered
PWM rectifier is controlled " sensorless three-phase PWM rectification with current phasor as reference frame is proposed in a text
Device control program, wherein obtaining ac-side current angular frequency and phase place by software phase-lock loop, and then passes through electric current and virtual magnetic
The relation indirect of chain estimates Virtual shipyard, and the major defect of this method is：To ensure to remain to correctly lock phase under no-load condition,
To maintain the minimum current that stabilized needs, system need to be which increased by a power resistor in parallel on DC capacitor
Open circuit loss.
Chai Jitao etc. is in patent of invention ZL201110097922.5 " sensorless synchronization PWM rectifier vector
The Zero voltage vector that effect a period of time before PWM rectifier starts is proposed in control method " is obtained at the beginning of Virtual shipyard vector
The method of value, the major defect of this method is：Moment is acted in Zero voltage vector, the three-phase power grid voltage of commutator is by opening
Close device short-circuit in short-term, can still cause dash current problem.
The content of the invention
It is an object of the invention to provide a kind of PWM rectifier Virtual shipyard vector initial value evaluation method, solves existing skill
Art switches to null vector that PWM rectification state initial stage apply a period of time in PWM rectifier in order to obtain Virtual shipyard vector initial value
Amount, causes short circuit in short-term to cause the problem of dash current.
The technical solution adopted in the present invention is, a kind of PWM rectifier Virtual shipyard vector initial value evaluation method, will
When switching to PWM rectification states, one section of quasi- switch step, in this quasi- switch step, three-phase bypass contactor are inserted
The state of disconnection is remained in that, the current-limiting resistance of net side charging is not bypassed, continues to suppress loop current in current-limiting resistance
In the case of, apply zero vector pwm signal to PWM rectifier and sound out estimation Virtual shipyard vector initial value,
Sound out under quasi- switch step after obtaining Virtual shipyard vector position and size, send into software phase-lock loop, by software
Phaselocked loop continues follow-up Virtual shipyard estimation on line, until three-phase bypass contactor is closed, the current-limiting resistance that net side is charged
Bypass, really switch to the moment in controlled rectification stage, software phase-lock loop will provide Virtual shipyard for PWM rectification control algolithms
Vector Initial Information.
The invention has the beneficial effects as follows, for smoothly switched to by uncontrollable rectifier state can during PWM rectifier starts
Control commutation phase, increases the quasi- switch step of one section of very short time, in this quasi- switch step, does not bypass net side charging
Current-limiting resistance, in the case where current-limiting resistance continues to suppress loop current, applies zero vector pwm signal to PWM rectifier and sounds out
The initial value of estimation Virtual shipyard vector, provides primary condition to take over seamlessly into the controlled rectification stage, it is to avoid PWM rectifications
In device tradition startup method, easily there is large impact or even caused in uncontrollable rectifier current transient in the handoff procedure of controlled rectification
Start the situation of failure, realize taking over seamlessly.The inventive method is easily achieved, and algorithm is completed before into PWM rectification states, no
The control effect in follow-up controlled rectification stage is affected, on the premise of current impact is solved, exactly Virtual shipyard is sweared
Measure initial value to be estimated, improve the reliability of system.
Description of the drawings
Fig. 1 be the inventive method (sensorless PWM rectifier) Virtual shipyard vector initial value estimation be
System structural representation；
Fig. 2 is the single synchronous coordinate system software phase-lock loop theory diagram in the inventive method；
Fig. 3 is the stable state vectogram of the Virtual shipyard oriented control PWM rectifier in the inventive method；
Fig. 4 is the operation principle flow chart of three phases in the inventive method.
In figure, 10. three-phase alternating-current supply, 20. threephase switches, 30. three-phase bypass contactors, 40. current-limiting resistances, 50. 3
Phase reactor, 60. AC current sensors, 70. power inverters, 81. DC filter capacitors, 82. direct current voltage sensors,
83. loads, 100.DSP controllers, 110. software phase-lock loops, 120. Virtual shipyard computing units, 111. operating units, 112.PI
Actuator, 113. adders, 114. integrators.
Specific embodiment
The present invention is described in detail with reference to the accompanying drawings and detailed description.
To solve above-mentioned problems present in existing method, ensure the estimation of Virtual shipyard vector initial value from principle
Accuracy, and then avoid PWM rectifier from dash current when starting, occur, the present invention proposes that a kind of new device starts method, tool
The body time sequential routine sees the sequential chart of Fig. 1.The inventive method increased one section of quasi- switch step compared with existing control method,
In this quasi- switch step, current limliting is kept, the initial value that zero vector sounds out Virtual shipyard vector is applied to PWM rectifier, it is ensured that
During incision PWM controlled rectification stages, Virtual shipyard vector does not have transition phenomenon, it is to avoid dash current, it is achieved thereby that smooth
Switching, the clean boot of equipment is ensure that from principle, equipment dependability is improve.
With reference to Fig. 1, (sensorless PWM rectifier) estimation Virtual shipyard vector that the inventive method is relied on
The system structure of initial value is that three-phase alternating-current supply 10 passes through 20 (i.e. threephase switch K in Fig. 1 of threephase switch1) and current-limiting resistance
40 one end correspondence connects, and current-limiting resistance 40 includes three current-limiting resistance R of parallel connection, is parallel with the two ends of three current-limiting resistance R
30 (i.e. three-phase bypass contactor K in Fig. 1 of three-phase bypass contactor2) contact；40 other end of current-limiting resistance passes through three-phase electricity
Anti- device 50 (i.e. three-phase reactor L in Fig. 1) is connected with 70 input of power inverter, three-phase reactor 50 and power inverter
It (is the i in Fig. 1 respectively that an AC current sensor 60 is respectively arranged with three-phase line between 70a、ib、icAlternating current
Sensor)；Two outfans of power inverter 70 and 83 corresponding connection of load, outfan and the load 83 of power inverter 70
Two connection lines on be connected to DC filter capacitor 81 (i.e. DC filter capacitor C in Fig. 1), 81 two ends of DC filter capacitor
It is provided with direct current voltage sensor 82；
The software phase-lock loop 110 and Virtual shipyard computing unit 120 of interconnection are provided with dsp controller 100, are exchanged
Current sensor 60 and direct current voltage sensor 82 are connected with the input of dsp controller 100 simultaneously；Dsp controller 100
(pwm signal) outfan is connected with (drive signal) input of power inverter 70, meanwhile, dsp controller 100 it is another defeated
Go out end (output bypass contactor control signal) to be connected with the control coil of three-phase bypass contactor 30.
With reference to Fig. 2, the internal structure of software phase-lock loop 110 is, including the operating unit 111, pi regulator of closed loop connection
112nd, adder 113 and integrator 114,
Operating unit 111 is for the component ψ under Virtual shipyard biphase static coordinateαAnd ψβIt is converted into two cordic phase rotators
Under component ψdAnd ψq；
Pi regulator 112 makes ψ for realizing closed loop controlqRealize locking phase when=0；
Adder 113 for by the output of pi regulator 112 and actual electric network rated frequency superimposed obtaining phaselocked loop
Estimation frequency；
Integrator 114 obtains the estimation angle of phaselocked loop output for the output frequency of adder 113 is integrated.
The inventive method is different from traditional approach, and the present invention is not, after three-phase bypass contactor 30 is closed, just to send out null vector
Amount pwm signal sounds out Virtual shipyard vector initial value, but based on above-mentioned operation structure, will switch to PWM rectification shapes
When state, one section of quasi- switch step is inserted, in this quasi- switch step, three-phase bypass contactor 30 remains in that disconnection
State, does not bypass the current-limiting resistance 40 of net side charging, in the case where current-limiting resistance 40 continues to suppress loop current, right
PWM rectifier applies zero vector pwm signal and sounds out estimation Virtual shipyard vector initial value；Sound out under quasi- switch step and obtain virtual
Behind flux linkage vector position and size, the software phase-lock loop 110 shown in Fig. 2 is sent into, continue follow-up virtual by software phase-lock loop 110
Magnetic linkage estimation on line, until three-phase bypass contactor 30 is closed, the current-limiting resistance 40 that net side charges is bypassed, is really switched to
The moment in controlled rectification stage, software phase-lock loop 110 will provide accurate Virtual shipyard vector initial value for PWM rectification control algolithms
Information.
The inventive method obtains the detailed process of Virtual shipyard vector initial value in increasedd quasi- switch step：
With reference to Fig. 4, whole PWM rectifier is divided into three phases to the process for completing the startup of PWM rectification states from upper electricity,
1) the uncontrollable rectifier stage
Closure threephase switch 20, due to not applying trigger pulse to the power inverter 70 in main circuit, becomes by power
The uncontrollable rectifier circuit that the fly-wheel diode of parallel operation 70 is constituted charges to DC filter capacitor 81.Three-phase bypass contactor 30 is in
Off-state, has sealed in current-limiting resistance 40 equivalent to AC, can prevent the electric initial stage from producing the impact of charging current.Work as direct current
Voltage rise to uncontrollable rectifier voltage and it is stable after, wait zero vector to be applied.
It is emphasized that the resistance R selection gist of current-limiting resistance 40 is as follows：
When the threephase switch 20 that closes, main circuit is charged to DC filter capacitor 81 in uncontrollable rectifier state, is charged
During three-phase alternating-current supply 10, current-limiting resistance 40, three-phase reactor 50, DC filter capacitor 81 and load 83 constitute loops,
By taking a phases as an example, the formula of alternating current circuit is：
Wherein eaFor a phase line voltage instantaneous values, unit is V (volt)；Resistances of the R for current-limiting resistance 40, unit is Ω
(Europe)；iaFor a phase power network current instantaneous values, unit is A (peace)；Inductance value of the L for three-phase reactor 50, unit is H (henry), t
It is the time, unit is s (second),
When inductive current reaches peak value, dia/ dt=0, then have：
ea=Ria, (2)
Resistance R of current-limiting resistance 40 is selected by formula (3), when circuit overcurrent protection value is ioc, then meet following formula：
Wherein EmFor line voltage peak value, unit is V (volt)；
2) quasi- switch step
Three-phase bypass contactor 30 remains in that the state of disconnection, and the current-limiting resistance 40 that net side charges continues to suppress loop electricity
Stream, applies zero vector pwm signal and sounds out estimation Virtual shipyard vector, after the zero vector that fails, PWM rectifications to PWM rectifier
Device is in uncontrollable rectifier state again.On the premise of Standard is met, the frequency fluctuation of electrical network is sufficiently small, thus known stopping
After the instantaneous phase and electrical network angular frequency of effect zero vector moment Virtual shipyard, it becomes possible to obtained by software phase-lock loop 110 online
The real-time phase of Virtual shipyard is obtained, detailed process is：
Apply the zero vector of a period of time to PWM rectifier, now three-phase alternating-current supply 10, current-limiting resistance 40 and three-phase electricity
Anti- device 50 constitutes loop, and Fig. 3 shows line voltage vectorPower network current vectorWith commutator AC voltage vector
The mutual relation of three, when zero vector is acted on, the relation of above-mentioned three is expressed by formula (4)：
ω therein is three-phase alternating-current supply angular frequency, and unit is rad/s (radian per second)；
AC current sensor 60 detects three-phase alternating current flow valuve, and the numerical value of collection is sent into dsp controller 100, this rank
Section Virtual shipyard computing unit 120 calculates component ψ of the Virtual shipyard under two-phase rest frame using formula (5)αAnd ψβ
(unit is Wb)：
Wherein iα、iβRespectively component of the power network current vector under biphase static α β coordinates, unit is A (peace)；When t is
Between, unit is s (second)；t0It it is the moment for applying zero vector pwm signal to PWM rectifier, unit is s (second)；t1It is right to stop
PWM rectifier applies the moment of zero vector pwm signal, and unit is s (second).
To eliminate integrator drift, the pure integration in formula (5), cascaded low-pass filter are replaced using cascaded low-pass filter
Transmission function such as formula (6)：
Wherein ωffFor the specified angular frequency of line voltage, unit is rad/s (radian per second), and s is complex variable；
Fail after zero vector, PWM rectifier is returned to uncontrollable rectifier state, on the premise of Standard is met,
Electrical network angular frequency fluctuation is sufficiently small, therefore, after zero vector fails, software phase-lock loop 110 obtains virtual by formula (7)
The phase place of flux linkage vector, during this period, it is believed that the size of Virtual shipyard is constant, then have：
θψ=θ1+ω01(t-t1) t1≤t≤t2, (7)
Wherein θ1Fail the moment (i.e. t for zero vector1Moment) Virtual shipyard phase angle, unit is rad (radian)；
ω01Fail the Virtual shipyard angular frequency at moment for zero vector, and unit is rad/s (radian per second)；t2For real incision PWM
The moment of rectification working condition, i.e., into the moment in controlled rectification stage, unit is s (second)；
After zero vector fails, the input of operating unit 111 in software phase-lock loop 110 disappears, and such as keeps pi regulator
112 outputs are constant, then due to the effect of integrator 114, still be able to online generation with Virtual shipyard phase angle before in identical
The Virtual shipyard phase angle of variation tendency.
3) the controlled rectification stage
After the completion of quasi- switch step, bypass current-limiting resistance 40, i.e. three-phase bypass contactor 30 and close；Really switching to
The moment of PWM rectification states, as now software phase-lock loop 110 has been able to accurately provide Virtual shipyard vector Initial Information
, therefore, whole controller has been realized in taking over seamlessly, it is to avoid the appearance of dash current phenomenon, and detailed process is：
Three-phase bypass contactor 30 is closed, and current-limiting resistance 40 exits loop, into PWM rectification working conditions, if incision PWM
The moment of rectification state is t2, t is obtained by formula (8)2Moment Virtual shipyard initial position angle θψ2, the size of Virtual shipyard is still
For t1The size at moment | Ψ1|, then have：
θψ2=θ1+ω01(t2-t1), (8)
Then t2The Virtual shipyard vector at moment is：
Symbol therein is the mould argument expression of vector, and ∠ is the meaning at angle,
Due to the Virtual shipyard vector initial value at known incision PWM rectification working condition momentIt is to ensure that incision PWM
Dash current is occurred without during rectification state,.
Claims (4)
1. a kind of PWM rectifier Virtual shipyard vector initial value evaluation method, it is characterised in that：PWM rectification shapes will switched to
When state, one section of quasi- switch step is inserted, in this quasi- switch step, three-phase bypass contactor (30) remains in that disconnection
State, do not bypass net side charging current-limiting resistance (40), current-limiting resistance (40) continue suppress loop current situation
Under, apply zero vector pwm signal to PWM rectifier and sound out estimation Virtual shipyard vector initial value,
Sound out under quasi- switch step after obtaining Virtual shipyard vector position and size, send into software phase-lock loop (110), by software
Phaselocked loop (110) continues follow-up Virtual shipyard estimation on line, until three-phase bypass contactor (30) is closed, net side is charged
Current-limiting resistance (40) is bypassed, and really switches to the moment in controlled rectification stage, and software phase-lock loop (110) will be PWM rectification controls
Algorithm processed provides Virtual shipyard vector Initial Information.
2. PWM rectifier Virtual shipyard vector initial value evaluation method according to claim 1, it is characterised in that whole PWM
Commutator is specifically divided into three below stage to the process for completing the startup of PWM rectification states from upper electricity：
1) the uncontrollable rectifier stage
Closure threephase switch (20), the uncontrollable rectifier circuit constituted by the fly-wheel diode of power inverter (70) are filtered to direct current
Ripple electric capacity (81) charges；Three-phase bypass contactor (30) is off；When DC voltage rise to uncontrollable rectifier voltage and
After stable, zero vector to be applied is waited；
2) quasi- switch step
Three-phase bypass contactor (30) remains in that the state of disconnection, and the current-limiting resistance (40) that net side charges continues to suppress loop electricity
Stream, applies zero vector pwm signal and sounds out estimation Virtual shipyard vector, after the zero vector that fails, PWM rectifications to PWM rectifier
Device is in uncontrollable rectifier state again,
After the instantaneous phase and electrical network angular frequency of the known zero vector moment Virtual shipyard that fails, it becomes possible to online by software
Phaselocked loop (110) obtains the real-time phase of Virtual shipyard, and detailed process is：
Apply the zero vector of a period of time to PWM rectifier, now three-phase alternating-current supply (10), current-limiting resistance (40) and three-phase electricity
Anti- device (50) constitutes loop, by line voltage vectorPower network current vectorWith commutator AC voltage vectorThree
Mutual relation, when zero vector is acted on, the relation of above-mentioned three is by formula (4) expression：
ω therein is three-phase alternating-current supply angular frequency, and R is the resistance of current-limiting resistance (40)；Electricity of the L for three-phase reactor (50)
Inductance value；
AC current sensor (60) detects three-phase alternating current flow valuve, and the numerical value of collection is sent into dsp controller (100), this rank
Section Virtual shipyard computing unit (120) calculates component ψ of the Virtual shipyard under two-phase rest frame using formula (5)αWith
ψβ：
Wherein iα、iβRespectively component of the power network current vector under biphase static α β coordinates；T is the time；t0It is to PWM rectifications
Device applies the moment of zero vector pwm signal；t1To stop applying PWM rectifier the moment of zero vector pwm signal,
To eliminate integrator drift, the pure integration in formula (5), the biography of cascaded low-pass filter are replaced using cascaded low-pass filter
Delivery function such as formula (6)：
Wherein ωffFor the specified angular frequency of line voltage, s is complex variable；
Fail after zero vector, PWM rectifier is returned to uncontrollable rectifier state, after zero vector fails, software phlase locking
Ring (110) obtains the phase place of Virtual shipyard vector by formula (7), during this period, it is believed that the size of Virtual shipyard is constant, then
Have：
θψ=θ1+ω01(t-t1) t1≤t≤t2, (7)
Wherein θ1Fail i.e. t constantly for zero vector1The Virtual shipyard phase angle at moment；ω01Fail the moment for zero vector
Virtual shipyard angular frequency；t2For the moment of real incision PWM rectification working conditions, i.e., into the moment in controlled rectification stage；
After zero vector fails, the input of operating unit (111) in software phase-lock loop (110) disappears, and such as keeps pi regulator
(112) export constant, then due to the effect of integrator (114), still being able to online generation with Virtual shipyard phase angle is before in
The Virtual shipyard phase angle of Similar trend；
3) the controlled rectification stage
After the completion of quasi- switch step, current-limiting resistance (40), i.e. three-phase bypass contactor (30) closure are bypassed；Really switching to
The moment of PWM rectification states, detailed process is：
Three-phase bypass contactor (30) is closed, and current-limiting resistance (40) exits loop, into PWM rectification working conditions, if incision PWM
The moment of rectification state is t2, t is obtained by formula (8)2Moment Virtual shipyard initial position angle θψ2, the size of Virtual shipyard is still
For t1The size at moment | Ψ1|, then have：
θψ2=θ1+ω01(t2-t1), (8)
Then t2The Virtual shipyard vector at moment is：
Due to the Virtual shipyard vector initial value at known incision PWM rectification working condition momentIt is to ensure that incision PWM rectifications
Dash current is occurred without during state,.
3. PWM rectifier Virtual shipyard vector initial value evaluation method according to claim 2, it is characterised in that described
In the uncontrollable rectifier stage, the resistance R selection gist of current-limiting resistance (40) is as follows：
When the threephase switch that closes (20), main circuit is charged to DC filter capacitor (81) in uncontrollable rectifier state, is charged
During three-phase alternating-current supply (10), current-limiting resistance (40), three-phase reactor (50), DC filter capacitor (81) and load (83)
Constitute loop,
By taking a phases as an example, the formula of alternating current circuit is：
Wherein eaFor a phase line voltage instantaneous values；iaFor a phase power network current instantaneous values；Inductance value of the L for three-phase reactor (50),
T is the time,
When inductive current reaches peak value, dia/ dt=0, then have：
ea=Ria, (2)
Resistance R of current-limiting resistance (40) is selected by formula (3), when circuit overcurrent protection value is ioc, then meet following formula：
Wherein EmFor line voltage peak value.
4. PWM rectifier Virtual shipyard vector initial value evaluation method according to claim 1, it is characterised in that：The method
What is relied on estimates that the system structure of Virtual shipyard vector initial value is,
Three-phase alternating-current supply (10) is by threephase switch (20) connection corresponding with current-limiting resistance (40) one end, current-limiting resistance (40) bag
Three current-limiting resistance R of parallel connection are included, and the contact of three-phase bypass contactor (30) are parallel with the two ends of three current-limiting resistance R；Limit
Leakage resistance (40) other end is connected with power inverter (70) input by three-phase reactor (50), three-phase reactor (50) with
An AC current sensor (60) is respectively arranged with three-phase line between power inverter (70)；Power inverter (70)
Connection corresponding with load (83) of two outfans, the outfan of power inverter (70) and two connection lines for loading (83)
On be connected to DC filter capacitor (81), DC filter capacitor (81) two ends are provided with direct current voltage sensor (82)；
The software phase-lock loop (110) and Virtual shipyard computing unit (120) of interconnection are provided with dsp controller (100), are handed over
Stream current sensor (60) and direct current voltage sensor (82) are while be connected with the input of dsp controller (100)；DSP is controlled
The outfan of device (100) is connected with the input of power inverter (70), meanwhile, another outfan of dsp controller (100) with
The control coil connection of three-phase bypass contactor (30).
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|---|---|---|---|---|
| CN102158065A (en) * | 2011-03-01 | 2011-08-17 | 徐州中矿大传动与自动化有限公司 | Method and device for controlling startup of PWM (pulse width modulation) rectifier without network side electrodynamic potential sensor |
| CN102170239A (en) * | 2011-04-18 | 2011-08-31 | 江苏南自通华电气成套有限公司 | Grid-voltage-sensor-free vector control method of synchronous PWM (Pulse Width Modulation) rectifier |
| CN104253543A (en) * | 2013-06-27 | 2014-12-31 | 无锡乐华自动化科技有限公司 | Oriented vector control method for virtual power grid magnetic flux linkage |
-
2015
- 2015-05-15 CN CN201510249416.1A patent/CN104868757B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102158065A (en) * | 2011-03-01 | 2011-08-17 | 徐州中矿大传动与自动化有限公司 | Method and device for controlling startup of PWM (pulse width modulation) rectifier without network side electrodynamic potential sensor |
| CN102170239A (en) * | 2011-04-18 | 2011-08-31 | 江苏南自通华电气成套有限公司 | Grid-voltage-sensor-free vector control method of synchronous PWM (Pulse Width Modulation) rectifier |
| CN104253543A (en) * | 2013-06-27 | 2014-12-31 | 无锡乐华自动化科技有限公司 | Oriented vector control method for virtual power grid magnetic flux linkage |
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| Title |
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| Research of Direct Power Control of PWM Rectifier Based on Virtual Flux;Guolong Yu et al.;《2014 17th International Conference on Electrical Machines and Systems(ICEMS)》;20141025;第775-779页 * |
| 基于虚拟磁链定向的PWM整流器控制方法研究;侯兆然;《电力系统保护与控制》;20141101;第42卷(第21期);第105-109页 * |
| 基于虚拟磁链的三电平PWM整流器定频DPC;张豪等;《电力电子技术》;20130228;第47卷(第2期);第82-85页 * |
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