CN105897109A - Alternating-current voltage-regulating speed-regulating apparatus - Google Patents
Alternating-current voltage-regulating speed-regulating apparatus Download PDFInfo
- Publication number
- CN105897109A CN105897109A CN201610424646.1A CN201610424646A CN105897109A CN 105897109 A CN105897109 A CN 105897109A CN 201610424646 A CN201610424646 A CN 201610424646A CN 105897109 A CN105897109 A CN 105897109A
- Authority
- CN
- China
- Prior art keywords
- chip microcomputer
- speed
- voltage
- regulating
- main control
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P2205/00—Indexing scheme relating to controlling arrangements characterised by the control loops
- H02P2205/01—Current loop, i.e. comparison of the motor current with a current reference
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P2205/00—Indexing scheme relating to controlling arrangements characterised by the control loops
- H02P2205/07—Speed loop, i.e. comparison of the motor speed with a speed reference
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P2207/00—Indexing scheme relating to controlling arrangements characterised by the type of motor
- H02P2207/01—Asynchronous machines
Abstract
The invention discloses an alternating-current voltage-regulating speed-regulating apparatus, and belongs to the technical field of digital electric control equipment. The alternating-current voltage-regulating speed-regulating apparatus is characterized by comprising a main-control single chip microcomputer (1), a first detection single chip microcomputer (2), a second detection single chip microcomputer (3), a third detection single chip microcomputer (4), a on-off control single chip microcomputer (5), a driving module (6), an analog value input module (7), a switching value input module (8) and an AC/AC conversion module (9), wherein the main-control single chip microcomputer (1) is electrically connected with the first detection single chip microcomputer (2), the second detection single chip microcomputer (3), the third detection single chip microcomputer (4), the on-off control single chip microcomputer (5), the driving module (6), the analog value input module (7), the switching value input module (8) and the AC/AC conversion module (9) separately. Compared with the prior art, the alternating-current voltage-regulating speed-regulating apparatus has the advantages of convenient operation, simple structure, reliable performance, rapid and convenient maintenance, high adaptability, and the like.
Description
Technical field
The invention belongs to numeral control panel technical field, in particular, belong to a kind of AC voltage adjusting and adjust
Speed variator.
Background technology
AC stator variable voltage control control system in prior art, is a ripe controllable silicon phase place lifting
Electric motor control system.Crane motor governing system uses the mould that ABB AB produces in a large number at present
Analog quantity AC stator variable voltage control control system, and the analog quantity AC stator that Siemens produces
Variable voltage control control system.Their control mode all uses Analog control mode, each parameter of system
All regulating with potentiometer, signal display uses light emitting diode.
The simulation governing system of prior art uses external speed ring and the double of internal current ring composition to close mostly
Loop systems, torque capacity can realize by changing the current limit of rheonome, so can keep away
Exempt from torque shock ends.Acceleration and deceleration that motor is smooth set time consistency with interior ramp generator, can subtract
Few to mechanical shock, elongate member service life.Arrangements for speed regulation have level or two kinds of forms of stepless control,
Speed adjustable range is from 5%～100%.The mechanical property of Speed closed-link system is hard and speed is steady.
The use environment at crane scene is relatively more severe, dust is many, temperature is high, it is very big especially to shake, mould
Analog quantity control system parameter is to be set by potentiometer, owing to dust and vibrations reason use for a long time and there will be
Parameter sets drift.Owing to analog quantity components and parts temperature influence drifts about, systematic parameter often needs
Adjust.Its velocity feedback mode uses test electromotor and pulse codr, as used pulse codr to need
Increase a conversion equipment, add the trouble point of whole system.Due to system self after breaking down
There is no self diagnosis and monitoring memory, therefore lookup fault can be relatively difficult.Owing in prior art, system does not has
Design anti-slip hook defencive function, use scene once to slip hook accident at crane.
Along with the development of microelectric technique, microprocessor and computer software, make the various of speed regulating control
Function the most all can pass through microprocessor, realizes by software.I.e. from the simulation in past control to simulation-
Numeral mixing controls development, finally realizes total digitalization.Automatic control technology enters computer age at present,
Need by using the present computer technology crane control characteristic to be tied mutually with the process of integrated information data
Close.Digitized is general at industrial circle of the basis of governing system automatization, particularly current web technology
And with development, the most more determine numerically controlled leading position.
Summary of the invention
The present invention, in order to efficiently solve above technical problem, gives a kind of ac voltage speed control dress
Put.
A kind of AC voltage-regulating speed-regulating apparatus of the present invention, it is characterised in that include main control singlechip, first
Detection single-chip microcomputer, the second detection single-chip microcomputer, the 3rd detection single-chip microcomputer, on-off control single-chip microcomputer, driving mould
Block, Analog input mModule, switching input module, AC/AC conversion module, main control singlechip is respectively
With first detection single-chip microcomputer, second detection single-chip microcomputer, the 3rd detection single-chip microcomputer, on-off control single-chip microcomputer,
Module, Analog input mModule, switching input module, AC/AC conversion module is driven to be electrical connected.
AC voltage-regulating speed-regulating apparatus in accordance with the above, it is preferable that tachometer feed-back signal, passes through
DC/DC modular converter A10 is transformed to 0～± 10V voltage signal, delivers to the defeated of the first detection single-chip microcomputer
Enter end, be converted into digital quantity signal through internal A/D converter, produce speed through data processor
Actual value, by the communication between main control singlechip and the first detection single-chip microcomputer, is transferred to master control signal
The input of single-chip microcomputer constitutes Speed closed-link system.
AC voltage-regulating speed-regulating apparatus in accordance with the above, it is preferable that rotor frequency feedback pulse signal is logical
After crossing optical coupling module isolation, deliver to the input of the second detection single-chip microcomputer, produce through data processor
Speed actual value, by the communication between main control singlechip and the second detection single-chip microcomputer, is transferred to signal
The input of main control singlechip constitutes Speed closed-link system.
AC voltage-regulating speed-regulating apparatus in accordance with the above, it is preferable that rotor voltage feedback signal, passes through V/F
Conversion is converted into rotor voltage, delivers to the input of the 3rd detection single-chip microcomputer, produces through data processor
Raw speed actual value, by the communication between main control singlechip and the 3rd detection single-chip microcomputer, transmits signal
Input to main control singlechip constitutes Speed closed-link system.
AC voltage-regulating speed-regulating apparatus in accordance with the above, it is preferable that main control singlechip output report lock controls to patrol
Collect signal and control the first relay to on-off control single-chip microcomputer, on-off control single-chip microcomputer through power driver module
K1 action is to control machinery report lock PS action.
AC voltage-regulating speed-regulating apparatus in accordance with the above, it is preferable that main control singlechip output rotor loop is cut
Except resistance control logical signal is to on-off control single-chip microcomputer, on-off control single-chip microcomputer is through power driver module control
Make the second relay K the 2, the 3rd relay K 3 action control rotor loop excision resistance contactor R1 to move
Make.
AC voltage-regulating speed-regulating apparatus in accordance with the above, it is preferable that main control singlechip is after data process
Output start pulse signal is given and is driven module, drives module trigger silicon controlled module U1 and then drive three-phase
Asynchronous machine rotary motion.
AC voltage-regulating speed-regulating apparatus in accordance with the above, it is preferable that Analog input mModule and switching value are defeated
Enter the input signal of module after operation amplifier, be input to main control singlechip and be converted into numeral through internal A/D
Amount.
AC voltage-regulating speed-regulating apparatus in accordance with the above, it is preferable that use in switching input module and grasp
Making the coaxial potentiometer of handle as speed preset, input voltage 0～± 10 is relative to speed 0～100%
Normal speed, the A/D conversion delivered within main control singlechip by computing becomes analog quantity into digital quantity,
By main control singlechip processing controls.
AC voltage-regulating speed-regulating apparatus in accordance with the above, it is preferable that current feedback signal passes through Current Mutual Inductance
Device detects current signal, is converted to voltage signal through AC/AC conversion module, delivers to main control singlechip,
It is converted into digital quantity signal through internal A/D converter, constitutes current closed-loop system through data processor
System.
The present invention compared with prior art has easy to operate, simple in construction, dependable performance, maintenance just
The advantages such as victory, strong adaptability.The AC voltage-regulating speed-regulating apparatus of the present invention compares with simulation governing system,
Technical performance has the following advantages: static accuracy is high, is not affected by ambient temperature；Dynamic property is good,
By means of abundant software, it is easy to accomplish all kinds of self adaptations and complex controll；Speed-regulating range width；Voltage wave
Dynamic little；Parameter realizes software implementation, without drift effect；Number of elements used is few, is difficult to lose efficacy；Setting value
Quantization degree is high, and state repetitive rate is good；Amplifier and interstage coupling noise are the least, and electromagnetic interference is little；
Debugging is i.e. gone into operation flexible, it is easy to design and Amending design；Standard and generalization degree are high, except host CPU
Outside module, only several add-on modules；Can realize, the polynary closed loop control including technological parameter；Suitable
Wide by scope, all kinds of speed Control can be realized and be easily achieved and single-chip microcomputer or PLC system communication.
Accompanying drawing explanation
Accompanying drawing 1 is the structural representation of AC voltage-regulating speed-regulating apparatus of the present invention；
Accompanying drawing 2 is the structural representation of silicon controlled module U1 in AC voltage-regulating speed-regulating apparatus of the present invention.
Detailed description of the invention
Fig. 1 is the structural representation of AC voltage-regulating speed-regulating apparatus of the present invention；The AC voltage adjusting of the present embodiment is adjusted
Speed variator includes that main control singlechip 1, first detects single-chip microcomputer 2, second and detects single-chip microcomputer the 3, the 3rd detection
Single-chip microcomputer 4, on-off control single-chip microcomputer 5, driving module 6, Analog input mModule 7, On-off signal
Module 8, AC/AC conversion module 9, main control singlechip 1 is examined with the first detection single-chip microcomputer 2, second respectively
Survey single-chip microcomputer the 3, the 3rd detection single-chip microcomputer 4, on-off control single-chip microcomputer 5, drive module 6, analog quantity defeated
Enter module 7, switching input module 8, AC/AC conversion module 9 are electrical connected.
Tachometer feed-back signal, is transformed to 0～± 10V voltage letter by DC/DC modular converter 10
Number, deliver to the input of the first detection single-chip microcomputer 2, be converted into digital quantity letter through internal A/D converter
Number, produce speed actual value through data processor, by main control singlechip 1 and the first detection monolithic
Communication between machine 2, input signal being transferred to main control singlechip 1 constitutes Speed closed-link system.
Rotor frequency feedback pulse signal, delivers to the input of the second detection single-chip microcomputer 3, at data
Reason program produces speed actual value, by the communication between main control singlechip 1 and the second detection single-chip microcomputer 3,
Input signal being transferred to main control singlechip 1 constitutes Speed closed-link system.
Rotor voltage feedback signal, is converted into rotor voltage by V/F conversion, delivers to the 3rd detection monolithic
The input of machine 4, produces speed actual value through data processor, by main control singlechip 1 and the
Communication between three detection single-chip microcomputers 4, input signal being transferred to main control singlechip 1 constitutes speed
Closed loop system.
Main control singlechip 1 output report lock controls logical signal to on-off control single-chip microcomputer 5, on-off control list
Sheet machine 5 controls the first relay K 1 action to control machinery report lock PS action through power driver module 51.
Main control singlechip 1 output rotor loop excision resistance control logical signal to on-off control single-chip microcomputer 5,
On-off control single-chip microcomputer 5 controls the second relay K the 2, the 3rd relay K 3 through power driver module 52
The excision resistance contactor R1 action of action control rotor loop.
Main control singlechip 1 exports start pulse signal to driving module 6, driving mould after data process
Block 6 triggers silicon controlled module U1 and then drives threephase asynchronous machine rotary motion.
The input signal of Analog input mModule 7 and switching input module 8, after operation amplifier, inputs
It is converted into digital quantity through internal A/D to main control singlechip 1.
Switching input module 8 uses and operates the coaxial potentiometer of handle as speed preset, input
Voltage 0～± 10, relative to speed 0～the normal speed of 100%, is delivered in main control singlechip 1 by computing
The A/D conversion in portion becomes analog quantity into digital quantity, by main control singlechip 1 processing controls.
Current feedback signal detects current signal by current transformer, through AC/AC conversion module 9 turns
It is changed to voltage signal, delivers to main control singlechip 1, be converted into digital quantity signal through internal A/D converter,
Current closed-loop system is constituted through data processor.
Fig. 2 is the structural representation of silicon controlled module U1 in AC voltage-regulating speed-regulating apparatus of the present invention, and five is right
Controllable silicon inverse parallel is serially connected on every phase winding.Phase controlling during pressure regulation, when load current circulates,
The forward controllable silicon of a phase and the reverse controllable silicon of another group is at least had to simultaneously turn on, so as three-phase
Bridge rectifier is such, it is desirable to each silicon controlled trigger pulse width all should be greater than 60 °, or uses
Two-pulse triggering.Using Two-pulse triggering circuit, during phase-shift voltage regulating, output voltage waveforms is not the most sinusoidal
Ripple, understands through analyzing, and output voltage does not contains even-order harmonic, with triple-frequency harmonics for main one-tenth in odd harmonic
Point.
If motor winding is without zero line, although then triple-frequency harmonics electromotive force exist, without have three times humorous
Ripple electric current.Owing to motor winding belongs to inductive load, current waveform can smooth than voltage waveform, but still contains
Having harmonic wave, thus produce the harmful effects such as pulse torque and added losses, this is thyristor regulating volt circuit
Shortcoming.When motor positive and inverse runs, in addition to rotating forward the controllable silicon 1-6 of work, negative phase sequence need be supplied
The controllable silicon 7-10 of power supply, they are together with 1,4, realize inverting work.
This circuit can also realize reverse rotating brake and the dynamic braking of motor.During reverse rotating brake, work
Controllable silicon i.e. six devices of reversion work described above.When needs carry out dynamic braking, can
Work asymmetrically with the several controllable silicon of the formal character according to braking circuit, such as, allow 1,2,6 three
Individual break-over of device, other device is both off, so that it may make to flow through in motor stator winding DC current, faced by
The rotor being rotating produces braking action.
Claims (10)
1. an AC voltage-regulating speed-regulating apparatus, it is characterised in that include main control singlechip (1), the first detection
Single-chip microcomputer (2), the second detection single-chip microcomputer (3), the 3rd detection single-chip microcomputer (4), on-off control single-chip microcomputer (5), drive
Dynamic model block (6), Analog input mModule (7), switching input module (8), AC/AC conversion module (9),
Main control singlechip (1) detects single-chip microcomputer (2), the second detection single-chip microcomputer (3), the 3rd detection monolithic respectively with first
Machine (4), on-off control single-chip microcomputer (5), driving module (6), Analog input mModule (7), On-off signal mould
Block (8), AC/AC conversion module (9) are electrical connected.
AC voltage-regulating speed-regulating apparatus the most according to claim 1, it is characterised in that tachometer generator
Feedback signal, is transformed to 0～± 10V voltage signal by DC/DC modular converter A10, delivers to first
The input of detection single-chip microcomputer (2), is converted into digital quantity signal, through data through internal A/D converter
Processing routine produces speed actual value, by leading between main control singlechip (1) and the first detection single-chip microcomputer (2)
News, input signal being transferred to main control singlechip (1) constitutes Speed closed-link system.
AC voltage-regulating speed-regulating apparatus the most according to claim 1, it is characterised in that rotor frequency is anti-
Feedback pulse signal, after being isolated by optical coupling module, delivers to the input of the second detection single-chip microcomputer (3), passes through
Data processor produces speed actual value, by between main control singlechip (1) and the second detection single-chip microcomputer (3)
Communication, signal be transferred to main control singlechip (1) input constitute Speed closed-link system.
AC voltage-regulating speed-regulating apparatus the most according to claim 1, it is characterised in that rotor voltage is anti-
Feedback signal, is converted into rotor voltage by V/F conversion, delivers to the input of the 3rd detection single-chip microcomputer (4),
Speed actual value is produced, by main control singlechip (1) and the 3rd detection single-chip microcomputer (4) through data processor
Between communication, signal be transferred to main control singlechip (1) input constitute Speed closed-link system.
AC voltage-regulating speed-regulating apparatus the most according to claim 1, it is characterised in that main control singlechip
(1) output report lock control logical signal drives through power to on-off control single-chip microcomputer (5), on-off control single-chip microcomputer (5)
Dynamic model block (51) controls the first relay K 1 action to control machinery report lock PS action.
AC voltage-regulating speed-regulating apparatus the most according to claim 1, it is characterised in that main control singlechip
(1) excision resistance in output rotor loop controls logical signal to on-off control single-chip microcomputer (5), on-off control monolithic
Machine (5) controls the second relay K the 2, the 3rd relay K 3 action control rotor through power driver module (52)
Loop excision resistance contactor R1 action.
AC voltage-regulating speed-regulating apparatus the most according to claim 1, it is characterised in that main control singlechip
(1) after data process, output start pulse signal is given and is driven module (6), drives module (6) to trigger controlled
Silicon module U1 and then drive threephase asynchronous machine rotary motion.
AC voltage-regulating speed-regulating apparatus the most according to claim 1, it is characterised in that analog input
The input signal of module (7) and switching input module (8), after operation amplifier, is input to main control singlechip (1)
It is converted into digital quantity through internal A/D.
AC voltage-regulating speed-regulating apparatus the most according to claim 1, it is characterised in that On-off signal
Module (8) uses and potentiometer that operation handle is coaxial is as speed preset, input voltage 0～± 10 relative
In speed 0～the normal speed of 100%, deliver to the internal A/D of main control singlechip (1) by computing and change handle
Analog quantity becomes digital quantity, by main control singlechip (1) processing controls.
AC voltage-regulating speed-regulating apparatus the most according to claim 1, it is characterised in that current feedback
Signal detects current signal by current transformer, is converted to voltage letter through AC/AC conversion module (9)
Number, deliver to main control singlechip (1), be converted into digital quantity signal, through data through internal A/D converter
Processing routine constitutes current closed-loop system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610424646.1A CN105897109A (en) | 2016-06-16 | 2016-06-16 | Alternating-current voltage-regulating speed-regulating apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610424646.1A CN105897109A (en) | 2016-06-16 | 2016-06-16 | Alternating-current voltage-regulating speed-regulating apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105897109A true CN105897109A (en) | 2016-08-24 |
Family
ID=56730836
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610424646.1A Pending CN105897109A (en) | 2016-06-16 | 2016-06-16 | Alternating-current voltage-regulating speed-regulating apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105897109A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101388640A (en) * | 2008-07-11 | 2009-03-18 | 上海智大电子有限公司 | Pressure and speed regulating system for semi-digital AC stator |
| CN201270495Y (en) * | 2008-09-18 | 2009-07-08 | 彭少贤 | Electricity saving device |
| CN102185555A (en) * | 2010-12-28 | 2011-09-14 | 上海智大电子有限公司 | Digitalized alternating-current voltage and speed regulation device |
| CN105429515A (en) * | 2015-12-14 | 2016-03-23 | 长沙奥托自动化技术有限公司 | System and method for controlling three-phase asynchronous motor to rotate reversely from forwards |
| CN205829517U (en) * | 2016-06-16 | 2016-12-21 | 大连科信起重电器有限公司 | A kind of AC voltage-regulating speed-regulating apparatus |
-
2016
- 2016-06-16 CN CN201610424646.1A patent/CN105897109A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101388640A (en) * | 2008-07-11 | 2009-03-18 | 上海智大电子有限公司 | Pressure and speed regulating system for semi-digital AC stator |
| CN201270495Y (en) * | 2008-09-18 | 2009-07-08 | 彭少贤 | Electricity saving device |
| CN102185555A (en) * | 2010-12-28 | 2011-09-14 | 上海智大电子有限公司 | Digitalized alternating-current voltage and speed regulation device |
| CN105429515A (en) * | 2015-12-14 | 2016-03-23 | 长沙奥托自动化技术有限公司 | System and method for controlling three-phase asynchronous motor to rotate reversely from forwards |
| CN205829517U (en) * | 2016-06-16 | 2016-12-21 | 大连科信起重电器有限公司 | A kind of AC voltage-regulating speed-regulating apparatus |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102494820A (en) | Electric dynamometer | |
| CN205829517U (en) | A kind of AC voltage-regulating speed-regulating apparatus | |
| CN105897109A (en) | Alternating-current voltage-regulating speed-regulating apparatus | |
| CN204190663U (en) | A kind of coiling electric motor speed regulating device | |
| CN204206038U (en) | A kind of dyeing apparatus Embedded Synchronous control system | |
| RU162513U1 (en) | DEVICE FOR REGULATING THE SPEED OF ASYNCHRONOUS ELECTRIC MOTORS WITH A CABINET FREQUENCY CONVERTER | |
| CN203682921U (en) | Overhead traveling crane control system | |
| CN114094880A (en) | Permanent magnet synchronous motor drive control system | |
| CN110488191A (en) | Nuclear power plant's emergency diesel dynamo off-line testing system | |
| Sharma et al. | Review on Methods of Fault Detection and Protection of Induction Motor | |
| Wheeler et al. | An electro-hydrostatic aircraft actuator using a matrix converter permanent magnet motor drive | |
| RU2193630C1 (en) | Excavator electric drive control device | |
| bin Romlie et al. | PWM technique to control speed of induction motor using Matlab/xPC target box | |
| CN111338397B (en) | Control system of variable working condition rotor test bed | |
| CN109406996A (en) | A kind of multifunctional testing circuit of direct current speed adjustment switch | |
| Chi | A new electric brush cutter | |
| CN203339672U (en) | Low-voltage frequency converter with overvoltage protection function | |
| Aziz et al. | Multi Speed Control with double fed system of DC Current Machine via Virtual Model of PWM | |
| Seeraji et al. | A flexible closed loop PMDC motor speed control system for precise positioning | |
| Dukare et al. | Induction Motor Control by Stator Voltage Control Method using PLC: A | |
| RU50732U1 (en) | DEVICE FOR SOFT STARTING OF MOTOR | |
| Ettomi et al. | Micro controller based adjustable closed-loop dc motor speed controller | |
| Ali | SPEED CONTROL OF (SEDM) ADOPTING CHOPPER CONVERTER AND PI CONTROLLER: Electrical | |
| CN104821602A (en) | Synchronous grid connection system and synchronous grid connection method | |
| RU2249297C2 (en) | Control device of pulse switching unit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160824 |
|
| WD01 | Invention patent application deemed withdrawn after publication |