CN103401485A - Variable frequency starting and reactive compensation integrated control device of high-power induction machine - Google Patents

Variable frequency starting and reactive compensation integrated control device of high-power induction machine Download PDF

Info

Publication number
CN103401485A
CN103401485A CN201310364717XA CN201310364717A CN103401485A CN 103401485 A CN103401485 A CN 103401485A CN 201310364717X A CN201310364717X A CN 201310364717XA CN 201310364717 A CN201310364717 A CN 201310364717A CN 103401485 A CN103401485 A CN 103401485A
Authority
CN
China
Prior art keywords
voltage
output
phase
control unit
contactor
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
Application number
CN201310364717XA
Other languages
Chinese (zh)
Inventor
赵克
孙力
吴凤江
安群涛
王志刚
张润松
段建东
王炜信
王帅
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Harbin Institute of Technology
Original Assignee
Harbin Institute of Technology
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Harbin Institute of Technology filed Critical Harbin Institute of Technology
Priority to CN201310364717XA priority Critical patent/CN103401485A/en
Publication of CN103401485A publication Critical patent/CN103401485A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

Abstract

The invention discloses a variable frequency starting and reactive compensation integrated control device of a high-power induction machine, belongs to the field of motor control, and aims to solve the problems about power quality such as network voltage drop, frequency reduction and the like due to stronger starting current during a starting process of an electric motor of a traditional ship electric propulsion system. The device comprises a main-control unit, an inverter controller, a three-phase rectifier, a filter capacitor, an inverter, an alternating current filter, a bus contactor, a variable frequency contactor, a contactor control circuit, a variable frequency voltage and current detection unit and a ship power network voltage and current detection unit, wherein the main-control unit, the inverter controller, the three-phase rectifier, the filter capacitor, the inverter and the alternating current filter constitute a frequency converter; and the ship power network is connected with an input end of a three-phase power source of an induction motor through the bus contactor.

Description

The varying frequency starting of high-power induction machine and reactive power compensation integrated control unit
Technical field
The present invention relates to varying frequency starting and the reactive power compensation integrated control unit of high-power induction machine, belong to Motor Control Field.
Background technology
In the watercraft electric propulsion system power configuration, whole supply network can be regarded the micro-grid power system of a finite energy as, the capacity of electricity generation system and the Capacity Ratio of load are more approaching, particularly as promoting mainly into the total capacity large percentage of the shared electrical network of capacity of high-power induction motor, in this motor starting procedure due to starting current than conference cause that line voltage falls, degradation power quality problem under frequency.And when high-power induction motor normally moves,, because the exciting curent of induction motor is larger, need electrical network that larger reactive power is provided, directly have influence on the efficiency of electrical network and generating set.
Summary of the invention
The present invention seeks to in the motor starting procedure that solves traditional watercraft electric propulsion system, due to starting current than conference cause that line voltage falls, degradation power quality problem under frequency, a kind of varying frequency starting and reactive power compensation integrated control unit of high-power induction machine are provided.
The varying frequency starting of high-power induction machine of the present invention and reactive power compensation integrated control unit, it comprises main control unit, circuit control device, three-phase rectifier, filter capacitor, inverter, alternating current filter, bus contactor, frequency conversion contactor, contactor control circuit, frequency conversion voltage and current detecting unit and network of ship voltage and current detecting unit
Main control unit, circuit control device, three-phase rectifier, filter capacitor, inverter and alternating current filter form frequency converter;
Network of ship connects the three-phase power input end of induction machine by the bus contactor;
Network of ship connects the input of three-phase rectifier by the frequency conversion contactor, the output of three-phase rectifier connects the direct-flow input end of inverter, filter capacitor is connected in parallel between the direct-flow input end of the output of three-phase rectifier and inverter, the ac output end of inverter connects the input of alternating current filter, and the output of alternating current filter connects the three-phase power input end of induction machine;
Frequency conversion voltage and current detecting unit gather the voltage and current signal of output side transducer, and the output of frequency conversion voltage and current detecting unit is connected with the first voltage and current signal input of circuit control device,
Network of ship voltage and current detecting unit gather the voltage and current signal of boats and ships grid side, and the output of network of ship voltage and current detecting unit is connected with the second voltage current signal input of circuit control device;
The gate pole control command output of circuit control device is connected with the gate pole control command input of inverter;
The input/output terminal of circuit control device is connected with the control inputs output of main control unit, and the contactor switching command output of main control unit is connected with the contactor switching command input of contactor control circuit.
Advantage of the present invention: the present invention is with the varying frequency starting of high-power induction motor and idle generation compensate function in one, and during application, electrical network need not separately to join idle generation compensation arrangement.
Realize flexible switching between varying frequency starting device and network of ship, avoid the harmful effect that in handoff procedure, impulse current causes system, still torque output greatly in starting process, can provide dynamic passive compensation to network of ship again during normal operation, energy-saving effect is remarkable, can greatly reduce power consumption, and then obviously reduce the comprehensive power consumption of motor operation.Adopt simultaneously flexible handoff technique, the excessive problem of impulse current while solving varying frequency starting and network of ship switching.
Description of drawings
Fig. 1 is the varying frequency starting of high-power induction machine of the present invention and the structural representation of reactive power compensation integrated control unit;
Fig. 2 is phase-locked theory diagram;
Fig. 3 is workflow diagram.
Embodiment
Embodiment one: present embodiment is described below in conjunction with Fig. 1 to Fig. 3, the varying frequency starting of the described high-power induction machine of present embodiment and reactive power compensation integrated control unit, it comprises main control unit 1, circuit control device 2, three-phase rectifier 3, filter capacitor 4, inverter 5, alternating current filter 6, bus contactor 7, frequency conversion contactor 8, contactor control circuit 10, frequency conversion voltage and current detecting unit 11 and network of ship voltage and current detecting unit 12;
Main control unit 1, circuit control device 2, three-phase rectifier 3, filter capacitor 4, inverter 5 and alternating current filter 6 form frequency converter;
Network of ship connects the three-phase power input end of induction machine by bus contactor 7;
Network of ship connects the input of three-phase rectifier 3 by frequency conversion contactor 8, the output of three-phase rectifier 3 connects the direct-flow input end of inverter 5, filter capacitor 4 is connected in parallel between the direct-flow input end of the output of three-phase rectifier 3 and inverter 5, the ac output end of inverter 5 connects the input of alternating current filter 6, and the output of alternating current filter 6 connects the three-phase power input end of induction machine;
Frequency conversion voltage and current detecting unit 11 gather the voltage and current signal of output side transducer, and the output of frequency conversion voltage and current detecting unit 11 is connected with the first voltage and current signal input of circuit control device 2,
Network of ship voltage and current detecting unit 12 gather the voltage and current signal of boats and ships grid side, and the output of network of ship voltage and current detecting unit 12 is connected with the second voltage current signal input of circuit control device 2;
The gate pole control command output of circuit control device 2 is connected with the gate pole control command input of inverter 5;
The input/output terminal of circuit control device 2 is connected with the control inputs output of main control unit 1, and the contactor switching command output of main control unit 1 is connected with the contactor switching command input of contactor control circuit 10.
Main control unit 1 adopts the DSP signal processor to realize.
The three phase full bridge circuit that three-phase rectifier 3 consists of six diodes.
The three phase full bridge circuit that inverter 5 consists of six IGBT.
Alternating current filter 6 consists of three pole reactor, inductance of series connection in every phase phase power circuit.
Contactor control circuit 10 adopts relay to realize, is used for the action of control bus contactor 7 and frequency conversion contactor 8.It is complementary that the instruction of relay output makes the state of bus contactor 7 and frequency conversion contactor 8, and one is out state, and another is off status.
As shown in Figure 2, described phase locking unit is processed the voltage signal of network of ship voltage and current detecting unit 12 collection boats and ships grid side, the output observation angle for the embedded phase locking unit of circuit control device 2, described phase locking unit
Figure BDA0000369477180000031
Controlled quentity controlled variable as switching contactor; Obtain observation angle
Figure BDA0000369477180000032
Process be:
Network of ship voltage and current detecting unit 12 gather the voltage signal u of boats and ships grid side a2, u b2, u c2, process CLARKE conversion is with u under the three phase static coordinate a2, u b2, u c2Convert the voltage u under the two-phase rest frame to α, u βThe CLARKE transformation for mula is:
u α u β u 0 = 2 3 1 - 1 / 2 - 1 / 2 0 3 / 2 - 3 / 2 1 / 2 1 / 2 1 / 2 u a 2 u b 2 u c 2 ;
And then through the PARK conversion, the voltage u under output two-phase rotating coordinate system df, u q
Transformation for mula is:
u df u q = cos θ ^ sin θ ^ - sin θ ^ cos θ ^ u α u β ;
The given magnitude of voltage of d axle
Figure BDA0000369477180000035
With the voltage u under the two-phase rotating coordinate system dfDifference as the input variable of pi regulator, the output variable u of described pi regulator fWith angular frequency feedforward value Wff with value as the input variable of integrator;
Figure BDA0000369477180000036
Wff gets 2 π f according to the network of ship frequency usually, and f is the frequency of network of ship.
Described integrator output observation angle
Figure BDA0000369477180000041
Described observation angle
Figure BDA0000369477180000042
While is as the translation-angle of PARK conversion.
Observation angle
Figure BDA0000369477180000043
Value is reflection network of ship phase place directly.Export in main control unit 1, after the induction machine varying frequency starting being detected and completing, the deviation of the phase place between the output of real-time adjustment frequency converter and detection of grid and frequency converter, frequency, voltage magnitude, make the device output voltage follow the tracks of the boats and ships line voltage, when both met requiring of Phase Tracking, the switching of frequency changing start up process to the network of ship power supply completed in the inverter action.
Operation principle:
1, induction machine varying frequency starting part
The common finite capacity of network of ship, directly start the induction electric chance network of ship caused enormous impact, affects the quality of power supply.when high-power induction motor varying frequency starting and idle generation compensation integrated apparatus run with load, at first transfer bus contactor 7 disconnects, frequency conversion contactor 8 closures, use the frequency converter varying frequency starting, described frequency converter comprises main control unit 1, circuit control device 2, three-phase rectifier 3, filter capacitor 4 and inverter 5, when the induction machine starting is completed, transfer bus contactor 7 closures, frequency conversion contactor 8 disconnects, directly supply with the induction machine operation by network of ship, and by varying frequency starting and the reactive power compensation integrated control unit of high-power induction machine, provide induction motor needed idle component.Three-phase network of ship voltage meets switching condition by amplitude and the phase angle that the phase-locked loop internal algorithm obtains line voltage, then realizes without impacting transfer bus contactor 7 and frequency conversion contactor 8.Like this, both guaranteed the safe starting of induction machine, the also consumption of conserve energy, realized the unification of energy consumption and system and device cost savings simultaneously.Frequency conversion voltage and current detecting unit 11 are responsible for monitoring frequency converter output voltage u a1, u b1, u c1With current i a1, i b1, i c1, and do necessary closed loop and protection control.
2, varying frequency starting and network of ship power switching part
After the induction machine frequency changing start up process is completed, induction machine need to be switched to network of ship, in this process, the power supply unit of induction motor is switched to network of ship by frequency changing start up process.Because frequency, the phase place of network of ship voltage is relatively-stationary, the people regulates for being difficult to, and when induction machine drops into network of ship, can the size, the phase place that drop into transient voltage will have influence on and steadily switch, if at switching instant frequency conversion output device and network of ship voltage-phase, have larger deviation even opposite, will produce very serious impulse current, for this situation, the strategy of the flexible switching of a kind of autotracking has been proposed, reach the purpose of eliminating impulse current, realize safely and reliably the switching conversion of motor.Designed digital phase-locked loop system as shown in Figure 2, the three-phase network of ship is realized detecting by network of ship voltage and current detecting unit 12, obtains u a2, u b2, u c2, i a2, i b2, i c2The observation angle value
Figure BDA0000369477180000051
Directly reflect the network of ship phase place.Near the network of ship frequency and error during less than 1Hz, think that the induction motor varying frequency starting completes in frequency.Because the θ angle is that converter plant initiatively sends, need to adjust in real time the deviation of phase place between frequency converter output and detection of grid and frequency converter, frequency, voltage magnitude, make the device output voltage follow the tracks of the boats and ships line voltage, when both met requiring of Phase Tracking, the switching of frequency changing start up process to the network of ship power supply completed in the inverter action.
3, dynamic passive compensation part
The basic principle of idle generation compensated part is connected in parallel on bridge circuit on network of ship by alternating current filter 6 exactly, suitably regulate phase place and the amplitude of bridge circuit AC output voltage, perhaps directly control its ac-side current, just can make this circuit absorb or send the electric current that meets the demands, realize that the purpose of compensation occurs dynamic reactive.Idle test section gathers three-phase voltage, and another group detects the three-phase output current, then judges the needed reactive power value of induction motor.Be exactly that break-make by power semiconductor switches converts dc voltage to the output voltage of AC and electrical network same frequency during the normal operation of idle generation compensated part, just as a voltage source inverter, what only its AC output connect is not passive load, but network of ship.Therefore, when only considering fundamental frequency, idle generation compensated part can be regarded as that amplitude and phase place all can control, the alternating-current voltage source with the electrical network same frequency.It is connected to network of ship by AC reactor.If the alternating voltage of line voltage and the output of idle generation compensated part is used respectively phasor
Figure BDA0000369477180000052
With Expression, connect the voltage on the reactance X of every phase inductance of alternating current filter 6
Figure BDA0000369477180000054
Namely
Figure BDA0000369477180000055
With
Figure BDA0000369477180000056
Vector difference.And the electric current of alternating current filter 6 can be controlled by its voltage.This electric current is exactly the electric current I that idle generation compensated part absorbs from network of ship.Therefore, change reactive power compensation part AC output voltage
Figure BDA0000369477180000057
Amplitude and with respect to
Figure BDA0000369477180000058
Phase place, just can change the voltage that connects on alternating current filter 6, thereby control phase place and the amplitude of idle generation compensated part from the electrical network Absorption Current, also just controlled idle generation compensated part and sent character and the size of power.Offset current passes through i al, i bl, i clDo closed-loop control.
Embodiment two: present embodiment is described further execution mode one, it also comprises that system mode shows and by key control unit 9, system mode shows and is connected with demonstration output and the external command input of main control unit 1 with the input/output terminal by key control unit 9.

Claims (8)

1. the varying frequency starting of high-power induction machine and reactive power compensation integrated control unit, it is characterized in that, it comprises main control unit (1), circuit control device (2), three-phase rectifier (3), filter capacitor (4), inverter (5), alternating current filter (6), bus contactor (7), frequency conversion contactor (8), contactor control circuit (10), frequency conversion voltage and current detecting unit (11) and network of ship voltage and current detecting unit (12)
Main control unit (1), circuit control device (2), three-phase rectifier (3), filter capacitor (4), inverter (5) and alternating current filter (6) form frequency converter;
Network of ship connects the three-phase power input end of induction machine by bus contactor (7);
Network of ship connects the input of three-phase rectifier (3) by frequency conversion contactor (8), the output of three-phase rectifier (3) connects the direct-flow input end of inverter (5), filter capacitor (4) is connected in parallel between the direct-flow input end of the output of three-phase rectifier (3) and inverter (5), the ac output end of inverter (5) connects the input of alternating current filter (6), and the output of alternating current filter (6) connects the three-phase power input end of induction machine;
Frequency conversion voltage and current detecting unit (11) gather the voltage and current signal of output side transducer, and the output of frequency conversion voltage and current detecting unit (11) is connected with the first voltage and current signal input of circuit control device (2),
Network of ship voltage and current detecting unit (12) gather the voltage and current signal of boats and ships grid side, and the output of network of ship voltage and current detecting unit (12) is connected with the second voltage current signal input of circuit control device (2);
The gate pole control command output of circuit control device (2) is connected with the gate pole control command input of inverter (5);
The input/output terminal of circuit control device (2) is connected with the control inputs output of main control unit (1), and the contactor switching command output of main control unit (1) is connected with the contactor switching command input of contactor control circuit (10).
2. the varying frequency starting of high-power induction machine and reactive power compensation integrated control unit according to claim 1, it is characterized in that, it also comprises that system mode shows and by key control unit (9), system mode shows and is connected with demonstration output and the external command input of main control unit (1) with the input/output terminal by key control unit (9).
3. the varying frequency starting of high-power induction machine and reactive power compensation integrated control unit according to claim 1, is characterized in that, main control unit (1) adopts the DSP digital signal processor to realize.
4. the varying frequency starting of high-power induction machine and reactive power compensation integrated control unit according to claim 1, is characterized in that the three phase full bridge circuit that three-phase rectifier (3) consists of six diodes.
5. the varying frequency starting of high-power induction machine and reactive power compensation integrated control unit according to claim 1, is characterized in that the three phase full bridge circuit that inverter (5) consists of six IGBT.
6. the varying frequency starting of high-power induction machine and reactive power compensation integrated control unit according to claim 1, is characterized in that, alternating current filter (6) consists of three pole reactor, inductance of series connection in every phase phase power circuit.
7. the varying frequency starting of high-power induction machine and reactive power compensation integrated control unit according to claim 1, it is characterized in that, contactor control circuit (10) adopts relay to realize, is used for the action of control bus contactor (7) and frequency conversion contactor (8).
8. the varying frequency starting of high-power induction machine and reactive power compensation integrated control unit according to claim 1, it is characterized in that, the embedded phase locking unit of circuit control device (2), described phase locking unit is processed the voltage signal of network of ship voltage and current detecting unit (12) collection boats and ships grid side, the output observation angle Controlled quentity controlled variable as switching contactor; Obtain observation angle
Figure FDA0000369477170000022
Process be:
Network of ship voltage and current detecting unit (12) gather the voltage signal u of boats and ships grid side a2, u b2, u c2, process CLARKE conversion is with u under the three phase static coordinate a2, u b2, u c2Convert the voltage u under the two-phase rest frame to α, u β
And then through the PARK conversion, the voltage u under output two-phase rotating coordinate system df, u q
The given magnitude of voltage of d axle
Figure FDA0000369477170000023
With the voltage u under the two-phase rotating coordinate system dfDifference as the input variable of pi regulator, the output variable u of described pi regulator fWith angular frequency feedforward value Wff with value as the input variable of integrator;
Described integrator output observation angle
Figure FDA0000369477170000025
Described observation angle
Figure FDA0000369477170000026
While is as the translation-angle of PARK conversion.
CN201310364717XA 2013-08-20 2013-08-20 Variable frequency starting and reactive compensation integrated control device of high-power induction machine Pending CN103401485A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201310364717XA CN103401485A (en) 2013-08-20 2013-08-20 Variable frequency starting and reactive compensation integrated control device of high-power induction machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201310364717XA CN103401485A (en) 2013-08-20 2013-08-20 Variable frequency starting and reactive compensation integrated control device of high-power induction machine

Publications (1)

Publication Number Publication Date
CN103401485A true CN103401485A (en) 2013-11-20

Family

ID=49565054

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201310364717XA Pending CN103401485A (en) 2013-08-20 2013-08-20 Variable frequency starting and reactive compensation integrated control device of high-power induction machine

Country Status (1)

Country Link
CN (1) CN103401485A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104038108A (en) * 2014-06-30 2014-09-10 江苏元凯电气科技有限公司 Control method of starting process of drive system of high-power double-salient-pole motor
CN104213597A (en) * 2014-08-26 2014-12-17 徐州徐工挖掘机械有限公司 Alternating-current variable-frequency speed-regulating control system for electro-hydraulic excavator
CN109104135A (en) * 2018-08-31 2018-12-28 史隰明 A kind of motor reactive power compensation frequency changer circuit
CN112383258A (en) * 2020-12-11 2021-02-19 核工业理化工程研究院 Control device for improving distortion degree of output voltage of frequency converter

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5199912A (en) * 1991-08-15 1993-04-06 Newport News Shipbuilding And Dry Dock Company Electric power system for marine vehicles
CN101976954A (en) * 2010-09-30 2011-02-16 中国矿业大学 Frequency converter and method for eliminating harmonic and compensating reactive power
CN102522927A (en) * 2011-11-26 2012-06-27 北海市深蓝科技发展有限责任公司 Motor soft start and dynamic reactive power compensation method
CN202565210U (en) * 2012-05-07 2012-11-28 中国石油化工集团公司 High-capacity motor soft starting device having power grid reactive power compensation function

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5199912A (en) * 1991-08-15 1993-04-06 Newport News Shipbuilding And Dry Dock Company Electric power system for marine vehicles
CN101976954A (en) * 2010-09-30 2011-02-16 中国矿业大学 Frequency converter and method for eliminating harmonic and compensating reactive power
CN102522927A (en) * 2011-11-26 2012-06-27 北海市深蓝科技发展有限责任公司 Motor soft start and dynamic reactive power compensation method
CN202565210U (en) * 2012-05-07 2012-11-28 中国石油化工集团公司 High-capacity motor soft starting device having power grid reactive power compensation function

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
张蕾等: "光伏逆变器三相锁相环技术与仿真", 《科学技术与工程》, vol. 10, no. 28, 31 October 2010 (2010-10-31), pages 7011 - 7013 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104038108A (en) * 2014-06-30 2014-09-10 江苏元凯电气科技有限公司 Control method of starting process of drive system of high-power double-salient-pole motor
CN104038108B (en) * 2014-06-30 2016-08-24 江苏元凯电气科技有限公司 A kind of control method of high-power double salient-pole electric machine drive system starting process
CN104213597A (en) * 2014-08-26 2014-12-17 徐州徐工挖掘机械有限公司 Alternating-current variable-frequency speed-regulating control system for electro-hydraulic excavator
CN104213597B (en) * 2014-08-26 2017-04-26 徐州徐工挖掘机械有限公司 Alternating-current variable-frequency speed-regulating control system for electro-hydraulic excavator
CN109104135A (en) * 2018-08-31 2018-12-28 史隰明 A kind of motor reactive power compensation frequency changer circuit
CN112383258A (en) * 2020-12-11 2021-02-19 核工业理化工程研究院 Control device for improving distortion degree of output voltage of frequency converter

Similar Documents

Publication Publication Date Title
Ochs et al. A method of seamless transitions between grid-tied and stand-alone modes of operation for utility-interactive three-phase inverters
CN109390960B (en) Real-time online comprehensive compensation device and method for voltage sag of power distribution network
CN102545260B (en) Method for controlling automatic seamless switching between grid-connected mode and grid-isolated mode of microgrid
CN102916437B (en) The soft combination method of a kind of grid-connected converter
CN101702583B (en) Method for controlling direct-drive wind power generation convertor
CN103050967A (en) Active disturbance control method of flexible direct current power transmission system
CN104393672B (en) A kind of motor seamless switching method of supplying power to estimated based on residual voltage
CN102790422B (en) A kind of UPS charging module device and control method thereof
CN101499728A (en) High voltage frequency conversion apparatus having STATCOM function, control method and control apparatus
CN103023344A (en) Universal smart grid power electronic device
CN204615400U (en) There is the Power Quality Comprehensive Treatment Device of short-circuit current-limiting function
CN103051281A (en) High-performance four-quadrant frequency converter
CN107359644B (en) Microgrid interface topology device
Song et al. Suppression method of current harmonic for three-phase PWM rectifier in EV charging system
CN203027153U (en) Universal smart power grid power electronic device
CN103855717A (en) Pulse-free soft starting method of low-voltage SVG (static var generator)
CN103259282B (en) A kind of non-isolation type and the soft combination method of isolated form photovoltaic combining inverter
CN104734193A (en) Distributed-generation three-phase inverter smooth switch control method
CN202353232U (en) High-voltage cascaded inverter power unit grid-connection feedback device
CN103401485A (en) Variable frequency starting and reactive compensation integrated control device of high-power induction machine
CN104218575A (en) UPQC (unified power quality conditioner) based on SCR (silicon controlled rectifier) and energy storage
CN113991670A (en) Alternating-current flexible loop closing control device for power grid and control method thereof
CN110198026A (en) A kind of the voltage dip governing system and its control method of impedance isolated form
Ochs et al. A technique for voltage-source inverter seamless transitions between grid-connected and standalone modes
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
C02 Deemed withdrawal of patent application after publication (patent law 2001)
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20131120