CN106019068A - Network voltage interruption detection and control method for multi-unit train network side converter - Google Patents
Network voltage interruption detection and control method for multi-unit train network side converter Download PDFInfo
- Publication number
- CN106019068A CN106019068A CN201610443051.0A CN201610443051A CN106019068A CN 106019068 A CN106019068 A CN 106019068A CN 201610443051 A CN201610443051 A CN 201610443051A CN 106019068 A CN106019068 A CN 106019068A
- Authority
- CN
- China
- Prior art keywords
- net pressure
- voltage
- net
- side converter
- network
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/28—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for meshed systems
Abstract
The invention relates to a network voltage interruption detection and control method for a multi-unit train network side converter. According to the method of the invention, a network voltage interruption detection condition is that a d-axis component Ed and a q-axis component Eq under a synchronous rotation coordinate system can be obtained after network voltage En is subjected to coordinate transformation, when the values of the d-axis component Ed and the q-axis component Eq are smaller than a certain set value X simultaneously, interruption occurs; and the amplitude and phase of bridge arm voltage Us* combined in a network voltage interruption period are controlled through a control method so to be consistent with the amplitude and phase of the network voltage En, and therefore, the network side converter can operate normally, and a fault will not be brought about. With detection means and control strategies of the multi-unit train network side converter for the network voltage interruption of a traction network adopted, the voltage interruption of the traction network can be detected fast; the network side converter can make correct control response; the normal and safe operation of equipment can be ensured; and potential safety hazards caused by bad power supply conditions of railways can be decreased.
Description
Technical field
The present invention relates to a kind of detection netting pressure interruption and control method, particularly relate to motor-car networking on a kind of applicable railway
Side converter presses the detection and control method interrupted for Traction networks net.
Background technology
For the tractive power supply system of electric railway, train is mainly by the slip of the pantograph at top with contact net
Contact carrys out power taking.The important component part of train traction electric power system is not only by contact net, is also a kind of more weak simultaneously
Electric supply installation, pantograph will directly affect the power taking quality of train with the contact condition of contact net, and then affect the operation of train
State.
The electric locomotive of low cruise, owing to pantograph is relatively steady with the contact gear ratio of contact net, general train is obtained in that
Stable electric current.But for the EMUs of high-speed cruising, too high speed causes pantograph vibrations aggravation, inevitably
The phenomenon that bow net separates will occur.When bow net separates, the high pressure between bow net can puncture the air gap, produces electric arc, along with
The air gap increases, when breakdown voltage is more than supply voltage, and arc extinction, in high-impedance state between pantograph and contact net,
Cause power failure.If net side converter cannot detect power failure, or does not carry out any process, when extensive on controlling
After multiple power supply, it is likely that net side converter AC can be caused to cross stream, cause protection by mistake.
Summary of the invention
The present invention provides a kind of and is suitable for the detection method that on railway, motor-car networking side converter interrupts for Traction networks net pressure,
And formulate corresponding net side converter control strategy so that it is can quickly detect supply conductor voltage and interrupt, make correct action,
Guarantee equipment can be properly functioning.
For reaching above-mentioned purpose, the technical solution used in the present invention is as follows:
The net pressure of a kind of motor-car networking side converter interrupts detection and control method, comprises the steps:
S1, by net press EnVirtual voltage E is obtained after phase shift 90 °m, net pressure EnWith virtual voltage EmThrough phaselocked loop and
Dq coordinate transform obtains the dq axle component E under net pressure synchronous phase angle θ and synchronous rotating framedAnd Eq；
S2, by dq axle component EdAnd EqPerunit value be set to 1 and 0；
S3, as dq axle component EdAnd EqValue simultaneously less than certain setting value X time, net pressure synchronous phase angle θ also there occurs change
Change, i.e. there occurs that net pressure is interrupted；
S4, when detect net pressure in have no progeny, shield closed loop control；
S5, the bridge arm voltage U that will generate during net pressure interruptions *Obtain under synchronous rotating frame after dq coordinate transform
D, q axle component UdAnd Uq；
To component UdAnd UqValue carry out force assignment: Ud=Ed, Uq=Eq, the interior brachium pontis electricity generated during making net pressure interrupt
Pressure Us *E is pressed with the net before power-offnOverlap；
After S6, net pressure are recovered, open closed loop control, recalculate through unidirectional current pressure ring and alternating current ring and obtain normally
Bridge arm voltage UsWith net pressure synchronous phase angle θ, recovery can be automatically adjusted normal.
On the basis of such scheme, the minimum voltage being likely to be breached when certain setting value X is much smaller than net pressure normal fluctuation
Umin。
The present invention is compared with prior art had the advantages that
The detection means interrupted for Traction networks net pressure according to the motor-car networking side converter proposed in the present invention and control
Strategy, it is possible to be quickly detected the voltage interruption of Traction networks, and make current transformer make correct control response, it is ensured that equipment energy
Enough normal safe run, and reduce the potential safety hazard caused because of the severe condition of power supply of railway.
Accompanying drawing explanation
Fig. 1 one motor-car networking side converter main circuit schematic diagram；
The control unit block diagram that Fig. 2 PWM rectifier is corresponding；
The principle schematic of Fig. 3 control unit；
The control block diagram of Fig. 4 alternating current ring；
Net side converter main circuit operation principle schematic diagram when Fig. 5 one net pressure is interrupted；
During Fig. 6 net pressure is interrupted, voltage vector changes schematic diagram；
Fig. 7 uses and nets the process schematic that after pressure interrupts control strategy, vector triangle recovery is set up.
Detailed description of the invention
The present invention is described further with embodiment below in conjunction with the accompanying drawings.
A kind of motor-car networking side converter main circuit schematic diagram that Fig. 1 provides for the present invention.Net side converter includes two
Single-phase PWM Rectifier in parallel, the AC of PWM rectifier two vice-side winding with tractive transformer respectively are directly connected to,
DC side parallel.PWM rectifier main circuit includes ac filter inductance L, power device B1～B4, DC support electric capacity C, secondary
Harmonic inductance LrAnd filter capacitor Cr.Wherein ac filter inductance L can be greatly reduced PWM rectifier injection AC network
Harmonic current；Power device B1～B4 selects the IGBT SPM of semibridge system, and its collection drives, protects and current measurement
Etc. function in one, energy simplied system structure, improve equipment dependability；DC support electric capacity C selects thin-film capacitor, ripple current
Handling capacity is strong, and equiva lent impedance is little, and the life-span is long；Second harmonic filter inductance LrAnd filter capacitor CrDeposit for filtering DC side
Secondary frequency rate DC pulse, regulated output voltage.
Doubleization main circuit structure uses phase-shifted pulse width modulation technology, the equivalent switch frequency of two PWM rectifier in parallel
Rate is 2 times of single PWM rectifier switching frequency, substantially reduces the current harmonics of whole PWM rectifier.During train traction,
PWM rectifier is operated in rectification operating mode, the AC rectification that tractive transformer introduces is become unidirectional current, it is provided that stable middle straight
Stream voltage；When train braking, the braking energy of train feeds back to tractive transformer through PWM rectifier, then is become by traction
Depressor feeds back to AC network.
Control principle and the process of motor-car networking side converter be specifically described below:
The net side converter of above-mentioned offer, can use control unit to be controlled PWM rectifier.Specifically, Fig. 2 is
Control unit block diagram corresponding to PWM rectifier that the present invention provides.As in figure 2 it is shown, DC voltage vdcDefeated through closed loop control
Go out watt current command value Id *, referenced reactive current value Iq *Can be given by control unit.Net pressure EnAfter phase shift 90 °
To virtual voltage Em, net pressure EnWith virtual voltage EmObtain net pressure synchronous phase angle θ through phaselocked loop and dq coordinate transform and rotate seat
Mark system off line pressure EnDq axle component Ed、Eq.Above-mentioned physical quantity Ed、Iq *、Id *, the alternating current I of θ and PWM rectifieraAnd prolong
Time 90 ° after the virtual orthographic electric current I that obtainsbCommon input AC electric current loop (I_loop), controls PWM rectification through computing output
Switching pulse g1～g8 of device.
The principle schematic of the control unit that Fig. 3 provides for the present invention.As it is shown on figure 3, this control unit includes unidirectional current
Pressure ring and alternating current ring.The input of unidirectional current pressure ring includes command value V of DC voltagedc*, the direct current of PWM rectifier output
Side voltage Vdc, unidirectional current pressure ring is output as watt current command value I of PWM rectifierd*；The input of alternating current ring includes
Watt current command value Id*, d axle component Ed, referenced reactive current value Iq*, net pressure synchronous phase angle θ, PWM rectifier alternating current
IaAnd the virtual orthographic electric current I obtained after time delay 90 °b, alternating current ring is output as controlling the switching pulse of PWM rectifier
G1～g8.
The alternating current ring control block diagram that Fig. 4 provides for the present invention.As shown in Figure 4, net pressure synchronous phase angle θ, alternating current
IaWith virtual orthographic electric current Ib, d axle component Ed, watt current command value Id *With referenced reactive current value Iq *Transport through Feedforward Decoupling
Calculate, the instruction output voltage of PWM rectifier can be obtained, and then obtain controlling opening of PWM rectifier by SPWM pulsewidth modulation
Close pulse g1～g8.
Be specifically described below motor-car networking side converter detection net pressure interrupt control principle and process:
Net side converter main circuit operation principle schematic diagram when Fig. 5 interrupts for a kind of net pressure that the present invention provides.Here need
It is noted that have no progeny in net pressure, original edge voltage is not to take sth for granted to be immediately turned into 0.This is due to power failure
Point occurred before the former limit of tractive transformer, when there is power failure, due to net side converter still in work, became according to traction
The equivalent model of depressor, now bridge arm voltage USBecome power end, boost after magnetizing inductance Lm with AC inductance L dividing potential drop
To former limit, owing to magnetizing inductance Lm is the biggest, thus the effect of AC inductance L can be ignored, it is believed that power failure
After, the actual measurement voltage on the former limit of tractive transformer is by EnBecome US, although USWaveform is pulse type, but due in control unit
Sample circuit often with filtering link, can well reduce US。
And the change of alternating current during for interrupting, can considering from such as lower angle, net pressure interrupts moment, being equivalent to former limit
Zero load, load-side as power supply, the most now alternating current IsIt is exactly that exciting curent (no-load current) is the least, at shutdown transient
Alternating current is immediately turned into 0.
It is illustrated in figure 6 voltage vector change schematic diagram during net pressure is interrupted.During net pressure is interrupted, without alternating current power supply
Thering is provided energy, DC voltage can constantly decline, due to bridge arm voltage USRelation proportional to DC voltage, therefore bridge arm voltage
USAlso constantly declining.Meanwhile, during net pressure is interrupted, phaselocked loop cannot press phase place by tracking network again so that USPhase place in the power down phase
Between can constantly deviate.USAmplitude and the change of phase place cause re-powering moment, USWith EnBetween have a voltage the biggest
Difference is added on AC inductance L, causes bigger rush of current, causes system protection or even shutdown.
Under normal circumstances, Ed、EqIt is respectively net pressure signal EnThrough coordinate transform d, q axle component under dq coordinate system, mark
One value is respectively 1 and 0.Net pressure interrupts moment, EdValue can reduce immediately, EqIt is the most no longer 0, it may occur that acutely change.From Fig. 6
Can analyze and obtain, net pressure signal EnIn a period of time of power down moment, it is assumed that DC voltage does not decline, the phase place of phaselocked loop
The most do not change, owing to the net pressure of detection is by EnInstantaneous abrupt change becomes Us, EdBecome UsProjection on d axle, EqBecome
UsIn the projection of q axle, then Ed、EqValue can change at once.Therefore may utilize Ed、EqSudden change as judge net pressure interrupt
Foundation.
By upper, net pressure interruption testing conditions can be set as follows: when E being detecteddAnd EqTime simultaneously less than certain setting value,
I.e. think and there occurs that net pressure is interrupted.The minimum electricity being likely to be breached when pressing normal fluctuation much smaller than net that this setting value can set
Pressure, because E when net pressure is interrupteddPace of change very fast, normal net voltage fluctuation scope can be crossed moment.And normally ripple pressed by net
E time dynamicqValue will not change, maintain near 0 the most always, only when net pressure interrupt time EqValue just can occur acutely
Change.
Fig. 7 is to use to net the process schematic that after pressure interrupts control strategy, vector triangle recovery is set up.AC overcurrent is
Owing to net pressure interrupts period UsAmplitude and the uncontrollable of phase place cause a voltage difference the biggest to be added on AC inductance L, enter
And caused stream.In this, as starting point, if it is possible to ensure, during net pressure is interrupted, to control the U of synthesiss *Amplitude and phase place
E is pressed with the net before power downnIdentical, then when again powering on, EnWith Us *Overlapping, now vector triangle will begin to pass through from d axle
Closed loop modulation slowly recovers to set up, and will not produce any pressure drop and cause dash current on inductance.
Specifically, after detecting that net pressure is interrupted, Closed loop operation is shielded, the bridge arm voltage generated during net pressure is interrupted
Us *Component U on d, q axled、UqCarry out forcing assignment: Ud=Ed, Uq=Eq, the U generated in making power-off times *Before power-off
Net pressure EnOverlap.After net pressure is recovered, it is then turned on normal closed loop control, is calculated normal bridge through Voltage loop and electric current loop
Arm voltage Us, recovery can be automatically adjusted normal.
Last it is noted that above example is only in order to illustrate technical scheme, it is not intended to limit；Although
With reference to previous embodiment, the present invention is described in detail, it will be understood by those within the art that: it still may be used
So that the technical scheme described in foregoing embodiments to be modified, or wherein portion of techniques feature is carried out equivalent；
And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
The content not being described in detail in this specification belongs to prior art known to professional and technical personnel in the field.
Claims (2)
1. the net pressure of a motor-car networking side converter interrupts detection and control method, it is characterised in that comprise the steps:
S1, by net press EnVirtual voltage E is obtained after phase shift 90 °m, net pressure EnWith virtual voltage EmThrough phaselocked loop and dq coordinate
Conversion obtains the dq axle component E under net pressure synchronous phase angle θ and synchronous rotating framedAnd Eq；
S2, by dq axle component EdAnd EqPerunit value be set to 1 and 0；
S3, as dq axle component EdAnd EqValue simultaneously less than certain setting value X time, net pressure synchronous phase angle θ also there occurs change, i.e.
There occurs that net pressure is interrupted；
S4, when detect net pressure in have no progeny, shield closed loop control；
S5, the bridge arm voltage U that will generate during net pressure interruptions *Obtain after dq coordinate transform the d under synchronous rotating frame,
Q axle component UdAnd Uq；
To component UdAnd UqValue carry out force assignment: Ud=Ed, Uq=Eq, the interior bridge arm voltage U generated during making net pressure interrupts *
E is pressed with the net before power-offnOverlap；
After S6, net pressure are recovered, open closed loop control, recalculate through unidirectional current pressure ring and alternating current ring and obtain normal brachium pontis
Voltage UsWith net pressure synchronous phase angle θ, recovery can be automatically adjusted normal.
2. the net pressure of motor-car networking side converter as claimed in claim 1 interrupts detection and control method, it is characterised in that institute
The minimum voltage U being likely to be breached when stating certain setting value X much smaller than net pressure normal fluctuationmin。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610443051.0A CN106019068B (en) | 2016-06-20 | 2016-06-20 | A kind of net pressure interruption detection and control method of EMU net side current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610443051.0A CN106019068B (en) | 2016-06-20 | 2016-06-20 | A kind of net pressure interruption detection and control method of EMU net side current transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106019068A true CN106019068A (en) | 2016-10-12 |
| CN106019068B CN106019068B (en) | 2018-08-31 |
Family
ID=57088050
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610443051.0A Active CN106019068B (en) | 2016-06-20 | 2016-06-20 | A kind of net pressure interruption detection and control method of EMU net side current transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106019068B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109038576A (en) * | 2018-09-10 | 2018-12-18 | 北京交通大学 | A kind of method that four quadrant convertor controller and network pressure interrupt judgement |
| CN109177820A (en) * | 2018-09-05 | 2019-01-11 | 北京交通大学 | A kind of EMU traction transmission system with phaselocked loop and network pressure interrupt method of discrimination |
| CN110514947A (en) * | 2019-07-22 | 2019-11-29 | 中车永济电机有限公司 | A kind of Locomotive Converter network pressure interruption detection and control method |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10170563A (en) * | 1996-12-05 | 1998-06-26 | Mitsubishi Electric Corp | Frequency detection device |
| JP2010133878A (en) * | 2008-12-05 | 2010-06-17 | Chugoku Electric Power Co Inc:The | Apparatus for determining performance of test plug |
| CN102064557A (en) * | 2010-12-16 | 2011-05-18 | 华北电力大学 | Subsynchronous resonance characteristic value analysis model of multi-machine system |
| CN103281028A (en) * | 2013-06-19 | 2013-09-04 | 南京航空航天大学 | Starting control method of starting/generating system based on double-stage matrix converter |
| CN103427749A (en) * | 2012-05-22 | 2013-12-04 | 北京航天发射技术研究所 | Permanent magnet synchronous motor servo control method based on per unit value design |
| CN104158209A (en) * | 2014-07-17 | 2014-11-19 | 浙江大学 | Droopy voltage source-type control method for double feed blower adaptive to microgrid multimode operation |
| CN203995757U (en) * | 2014-07-14 | 2014-12-10 | 国家电网公司 | A kind of low pressure inversion feedback type traction electric power system |
| CN104569696A (en) * | 2015-01-30 | 2015-04-29 | 闫朝阳 | Island detection method based on dq conversion and used for voltage per unit value positive feedback |
| CN104836255A (en) * | 2015-05-27 | 2015-08-12 | 重庆大学 | Implicit PI-based digital phase-locked loop and power grid synchronization system |
| CN105529710A (en) * | 2015-12-01 | 2016-04-27 | 贵州大学 | Control method and device based on distribution static synchronous compensator (DSTATCOM) topological structure |
-
2016
- 2016-06-20 CN CN201610443051.0A patent/CN106019068B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10170563A (en) * | 1996-12-05 | 1998-06-26 | Mitsubishi Electric Corp | Frequency detection device |
| JP2010133878A (en) * | 2008-12-05 | 2010-06-17 | Chugoku Electric Power Co Inc:The | Apparatus for determining performance of test plug |
| CN102064557A (en) * | 2010-12-16 | 2011-05-18 | 华北电力大学 | Subsynchronous resonance characteristic value analysis model of multi-machine system |
| CN103427749A (en) * | 2012-05-22 | 2013-12-04 | 北京航天发射技术研究所 | Permanent magnet synchronous motor servo control method based on per unit value design |
| CN103281028A (en) * | 2013-06-19 | 2013-09-04 | 南京航空航天大学 | Starting control method of starting/generating system based on double-stage matrix converter |
| CN203995757U (en) * | 2014-07-14 | 2014-12-10 | 国家电网公司 | A kind of low pressure inversion feedback type traction electric power system |
| CN104158209A (en) * | 2014-07-17 | 2014-11-19 | 浙江大学 | Droopy voltage source-type control method for double feed blower adaptive to microgrid multimode operation |
| CN104569696A (en) * | 2015-01-30 | 2015-04-29 | 闫朝阳 | Island detection method based on dq conversion and used for voltage per unit value positive feedback |
| CN104836255A (en) * | 2015-05-27 | 2015-08-12 | 重庆大学 | Implicit PI-based digital phase-locked loop and power grid synchronization system |
| CN105529710A (en) * | 2015-12-01 | 2016-04-27 | 贵州大学 | Control method and device based on distribution static synchronous compensator (DSTATCOM) topological structure |
Non-Patent Citations (1)
| Title |
|---|
| 张朋 等: "基于FPGA的塔康中频信号模拟器设计", 《电子测量技术》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109177820A (en) * | 2018-09-05 | 2019-01-11 | 北京交通大学 | A kind of EMU traction transmission system with phaselocked loop and network pressure interrupt method of discrimination |
| CN109038576A (en) * | 2018-09-10 | 2018-12-18 | 北京交通大学 | A kind of method that four quadrant convertor controller and network pressure interrupt judgement |
| CN110514947A (en) * | 2019-07-22 | 2019-11-29 | 中车永济电机有限公司 | A kind of Locomotive Converter network pressure interruption detection and control method |
| CN110514947B (en) * | 2019-07-22 | 2021-08-03 | 中车永济电机有限公司 | Network voltage interruption detection and control method for locomotive traction converter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106019068B (en) | 2018-08-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105620706B (en) | Watercraft electric propulsion system with harmonics restraint and regenerative braking function and control method | |
| CN104333038A (en) | Method and device for recovering mixed regenerative energy of urban railway power supply system | |
| CN103414207A (en) | Droop control-based smooth switching method | |
| CN104935006B (en) | A kind of high voltage crossing control method | |
| CN109955739B (en) | Train bow net offline crossing control device, system and method | |
| WO2012122870A1 (en) | New test power supply for transformer | |
| CN107565826A (en) | Rectifier transformer medium-pressure type regenerative braking energy feedback device and its control method altogether | |
| CN109412425A (en) | A kind of band inhibits the three level-four-quadrant frequency converter and control method of vertical compression fluctuation | |
| CN102244466B (en) | Voltage sag generator | |
| CN104009497B (en) | A kind of LVRT Capability of Wind Turbine Generator and active power filter compensating device and changing method | |
| Popescu et al. | Indirect current control in active DC railway traction substations | |
| CN102315680A (en) | High-voltage and super-capacitance power battery charger | |
| CN106019068A (en) | Network voltage interruption detection and control method for multi-unit train network side converter | |
| CN103986347B (en) | A kind of three-phase semi-controlled bridge type rectification triggering circuit with defencive function | |
| CN102097963B (en) | Three-phase full-controlled rectifying device and rectifying and current-limiting method thereof | |
| CN101638061A (en) | Method for suppressing line-side harmonics of magnetic-levitation train tractive power supply system capable of feeding back braking energy | |
| CN110514947B (en) | Network voltage interruption detection and control method for locomotive traction converter | |
| CN103532423B (en) | Complex controll current source type combining inverter under a kind of rest frame | |
| CN103715914B (en) | Controlled rectification/the inversion controlling method of a kind of band power feedforward, device and a kind of high voltage converter | |
| CN106451485A (en) | Comprehensive control device for power quality of transformer of electrified railway traction substation | |
| CN104184343B (en) | Silicon controlled rectifier rectification feedback apparatus | |
| CN103401266A (en) | Device and method for realizing seamless switching between grid-connected mode and off-grid mode of inverter | |
| Suru et al. | Indirect Current Control of a Filtering and Regeneration System used in DC Substations for Urban Traction | |
| CN104079192A (en) | Multipath automatic switch high-voltage charger | |
| CN203119838U (en) | High-performance four-quadrant frequency converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |