CN103582999A - Apparatus for controlling rotor current in a wound-rotor type induction motor - Google Patents

Apparatus for controlling rotor current in a wound-rotor type induction motor Download PDF

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Publication number
CN103582999A
CN103582999A CN201280022263.1A CN201280022263A CN103582999A CN 103582999 A CN103582999 A CN 103582999A CN 201280022263 A CN201280022263 A CN 201280022263A CN 103582999 A CN103582999 A CN 103582999A
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China
Prior art keywords
rotor
switching module
semiconductor switching
phase
unit
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CN201280022263.1A
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Chinese (zh)
Inventor
朴时佑
金富光
金星完
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XYVEC CO Ltd
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XYVEC CO Ltd
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    • 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
    • H02P3/00—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters
    • H02P3/06—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter
    • H02P3/18—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing an ac motor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/14—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from dynamo-electric generators driven at varying speed, e.g. on vehicle
    • H02J7/16—Regulation of the charging current or voltage by variation of field
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • 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
    • H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • H02P9/04—Control effected upon non-electric prime mover and dependent upon electric output value of the generator
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0083—Converters characterised by their input or output configuration
    • H02M1/0085—Partially controlled bridges
    • 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
    • H02P2201/00—Indexing scheme relating to controlling arrangements characterised by the converter used
    • H02P2201/09—Boost converter, i.e. DC-DC step up converter increasing the voltage between the supply and the inverter driving the motor
    • 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
    • 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
    • H02P2207/07—Doubly fed machines receiving two supplies both on the stator only wherein the power supply is fed to different sets of stator windings or to rotor and stator windings
    • H02P2207/073—Doubly fed machines receiving two supplies both on the stator only wherein the power supply is fed to different sets of stator windings or to rotor and stator windings wherein only one converter is used, the other windings being supplied without converter, e.g. doubly-fed induction machines
    • 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
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
    • H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Ac Motors In General (AREA)
  • Inverter Devices (AREA)

Abstract

Provided is an apparatus for controlling rotor current in a wound-rotor type induction motor. The apparatus for controlling rotor current comprises: a wound-rotor type induction motor; and a voltage-boosting unit which uses a coil wound on the rotor of the wound-rotor type induction motor as an inductor so as to boost the voltage induced to the rotor. Thus, the current flowing along the coil wound on the rotor of the wound-rotor type induction motor is regenerated as a system power source, thereby promoting energy reduction.

Description

For controlling the equipment of the rotor current of wound rotor formula induction machine
Technical field
The present invention relates to the control to coiling rotator type induction machine, more specifically, relate to the overcurrent for flowing through, the equipment that is simultaneously power supply by the regeneration of current flowing through in the rotor winding at wound rotor formula induction machine in reversal connection or plugging process are controlled at the rotor winding of wound rotor formula induction machine.
Background technology
Conventionally, wound rotor formula induction machine can be such motor: this motor has the secondary winding by three-phase coil is formed around rotor core, and provides collector ring secondary current is directed to outside by brush on the leading edge of each phase of coil.
This kind of wound rotor formula induction machine can be realized the torque of high angle, to drive and to control its resistance by external resistor being connected to rotor winding.Therefore, wound rotor formula induction machine can be widely used to drive the equipment with high inertia load, such as crane, rolling mill, compressor etc.
In existing wound rotor formula induction machine as above, can be by external resistor being connected to each phase of rotor winding and carrying out short circuit (controlling resistance) in the mode of stepping and come controlling torque and speed.Thereby, advantageously select best maximum or pull up torque, in the external resistor that is connected to rotor winding, adversely produce a large amount of losses simultaneously.
Except said method, also imagined the method for coming controlling torque and speed by control the amount of the electric current that flows through rotor winding according to pulse-width modulation (PWM) signal.
According to this kind of method, external resistor as above can be replaced thereupon, thereby can eliminate the loss causing due to non-essential resistance.
With which, can study for controlling the torque of wound rotor formula induction machine and the whole bag of tricks of speed, but about for by being the method that power supply reduces power consumption by the regeneration of current of being responded to by rotor, its research and development and research are wherein all meaningless.
In addition, in the situation that by the phase sequence of system power supply being converted to negative-phase sequence to provide electric power to brake (being called as " reversal connection or plugging ") to coiling rotator type induction machine to the stator winding of coiling rotator type induction machine, cause the damage to the diode of rear class or switch element thereby may flow through overcurrent in rotor winding.
Summary of the invention
Technical problem
It is a kind of for the overcurrent flowing through in reversal connection or plugging process are controlled at the rotor winding of wound rotor formula induction machine, the equipment that is power supply by the regeneration of current flowing through in the rotor winding at wound rotor formula induction machine simultaneously that one aspect of the present invention provides.
Technical scheme
According to an aspect of the present invention, provide a kind of for controlling the equipment of the rotor current of wound rotor formula induction machine, this equipment comprises: wound rotor formula induction machine; And boosting unit, this boosting unit is used the rotor winding of wound rotor formula induction machine self as inductor, and the voltage of responding in rotor winding is boosted.
This equipment can also comprise phase transition unit, and in braking procedure, phase transition unit is converted to negative-phase sequence by the phase sequence of system power supply.
This equipment can also comprise inductance unit, and inductance unit is connected to each phase of the rotor winding of wound rotor formula induction machine, to be controlled at the overcurrent producing in braking procedure.
Phase transition unit comprises: the first semiconductor switching module, and the first semiconductor switching module has the two ends of the first-phase that is connected to stator winding; The second semiconductor switching module, the second semiconductor switching module has the two ends of the second-phase that is connected to stator winding; The 3rd semiconductor switching module, the 3rd semiconductor switching module has the two ends of the third phase that is connected to stator winding; The 4th semiconductor switching module, the 4th semiconductor switching module has the one end that is connected to second-phase and the other end that is connected to third phase; And the 5th semiconductor switching module, the 5th semiconductor switching module has the one end that is connected to third phase and the other end that is connected to second-phase.
Each in the first semiconductor switching module to the five semiconductor switching modules comprises at least one semiconductor switch.
Semiconductor switch can comprise thyristor units.
When the second semiconductor switching module and the connection of the 3rd semiconductor switching module, the 4th semiconductor switching module and the 5th semiconductor switching module turn-off, and when the 4th semiconductor switching module and the connection of the 5th semiconductor switching module, the second semiconductor switching module and the 3rd semiconductor switching module turn-off.
This equipment can also comprise electric power regeneration unit, electric power regeneration unit by the voltage transmission after being boosted by boosting unit to system power supply.
Boosting unit can comprise: rotor current controller, and rotor current controller comprises that switch element is to be controlled at the electric current flowing through in rotor winding, switch element has one end of each phase that is connected to rotor winding; And booster diode unit, booster diode unit comprise diode and by the current delivery from rotor winding to electric power regeneration unit, diode has the anode of each phase that is connected to rotor winding.
Electric power regeneration unit can comprise: connect the regeneration inverter of electrical network, the regeneration inverter that connects electrical network becomes exchange (AC) voltage and AC voltage is offered to system power supply by the voltage transitions after being boosted by boosting unit.
The regeneration inverter that connects electrical network is one that from pulse-width modulation (PWM) inverter and 120 degree conduction inverters, selects.
This equipment can also comprise: counterflow-preventing diode, and counterflow-preventing diode prevents that electric current is from the reverse flow of electric power regeneration unit to boosting unit, counterflow-preventing diode is arranged between boosting unit and electric power regeneration unit.
Switch element can be at least one that select from comprise the semiconductor switch of igbt (IGBT), field-effect transistor (FET), gate level turn-off thyristor (GTO) and bipolar junction transistor (BJT).
This equipment can also comprise: surge filter, surge filter is connected to the other end of switch element and the negative electrode of diode, and is absorbed in the surge voltage producing in the switching manipulation process of switch element and burns out to prevent switch element.
Beneficial effect
According to an aspect of the present invention, can present by the regeneration of current flowing through in the rotor winding at wound rotor formula induction machine can be improved to the technique effect of the minimizing in energy use to system power supply.
According to another aspect of the present invention, the voltage of responding in the rotor winding of wound rotor formula induction machine can be boosted, for example, thereby can be presented in the situation that there is no the other equipment that boosts (transformer), voltage for regeneration can be arrived to the technique effect of system power supply.
According to a further aspect of the invention, may obtain by each that the inductor (its size changes according to frequency) with inductance component is connected to rotor winding and can in reversal connection or plugging process, be controlled at mutually the overcurrent that flows through in the rotor winding of wound rotor formula induction machine so that system is carried out to stable technique effect.
Accompanying drawing explanation
Fig. 1 be explanation according to the first embodiment of the present invention for controlling the overall arrangement figure of equipment of the rotor current of wound rotor formula induction machine.
Fig. 2 be illustrate according to a second embodiment of the present invention for controlling the overall arrangement figure of equipment of the rotor current of wound rotor formula induction machine.
Fig. 3 is that explanation is according to the size of voltage that is applied to the stator winding of wound rotor formula induction machine, the schematic diagram of the relation between torque and revolutional slip.
Fig. 4 is the schematic diagram of the explanation equivalent electric circuit corresponding with the second embodiment of the present invention shown in Fig. 2.
Fig. 5 is for describing the schematic diagram of the control model of the second embodiment of the present invention shown in Fig. 2.
Embodiment
Below, with reference to accompanying drawing, specifically describe embodiments of the invention.Yet the present invention can implement with multiple different form, is not limited to embodiment described herein and should not be envisioned for.In the accompanying drawings, can be for the clear and shape and size of amplifier unit, and identical Reference numeral will be run through use with indicate identical or with like parts.
Fig. 1 be explanation according to the first embodiment of the present invention for controlling the overall arrangement figure of equipment of the rotor current of wound rotor formula induction machine.For controlling the equipment of rotor current, can comprise wound rotor formula induction machine IM and boosting unit 110, wound rotor formula induction machine IM comprises stator winding 111a and rotor winding 111b, use the rotor winding 111b of wound rotor formula induction machine IM as inductor, boosting unit 110 boosts the voltage in rotor winding 111b induction, and this equipment can also comprise by the voltage transitions of being boosted by boosting unit 110 being the electric power regeneration unit 120 of system power supply 100.
Simultaneously, boosting unit 110 can comprise rotor current controller 112 and booster diode unit 113, rotor current controller 112 comprise have be connected to each phase A, the B of rotor winding 111b and one end of C switch element Q1 to Q3 to control the electric current in rotor winding 111b, booster diode unit 113 comprise have be connected to each phase A, the B of rotor winding 111b and the anode of C diode D1 to D3 so that the current delivery from rotor winding 111b is arrived to electric power regeneration unit 120.
In addition, according to embodiments of the invention, for controlling the equipment of rotor current, can also comprise surge filter 140 and counterflow-preventing diode 130, surge filter 140 is connected to the negative electrode of switch element Q1 to the other end of Q3 and diode D1 to D3 and is absorbed in switch element Q1 and to Q3, burns out to prevent switch element Q1 to the surge voltage producing in the switching manipulation process of Q3, and counterflow-preventing diode 130 prevents that electric current is from 120 reverse flows of electric power regeneration unit to boosting unit 110.
Below by specifically describe according to first embodiment of the invention for controlling the concrete configuration of equipment of the rotor current of wound rotor formula induction machine.
First, use the rotor winding 111b of wound rotor formula induction machine IM as inductor, boosting unit 110 can be by the boost in voltage of responding in rotor winding 111b.Can carry out boosting of voltage for each phase A, B and C, and the voltage after boosting can be transferred to electric power regeneration unit 120 by counterflow-preventing diode 130.
Particularly, boosting unit 110 can comprise rotor current controller 112 and booster diode unit 113.Booster diode unit 113 can comprise that three diode D1 are to D3, and three diode D1 have the negative electrode that is connected to each phase A, the B of rotor winding 111b and the anode of C and is connected to electric power regeneration unit 120 by counterflow-preventing diode 130 to D3.
In addition, rotor current controller 112 can comprise three switch element Q1 to Q3 to control one end of the electric current flowing through in rotor winding 111b, three switch element Q1 have and are connected to each phase A, the B of rotor winding 111b and the anode of C to Q3.; according to above-mentioned configuration; therefore each phase A, the B of rotor winding 111b and C can be used as inductor, and can configure three booster converters altogether that B phase-switch element Q2-diode D2 of A phase-switch element Q1-diode D1, rotor winding 111b and C phase-switch element Q3-diode D3 of rotor winding 111b by rotor winding 111b form respectively.
Rotor current controller 112 can be at least one that select from comprise the semiconductor switch of igbt (IGBT), field-effect transistor (FET), gate level turn-off thyristor (GTO) and bipolar junction transistor (BJT).
As mentioned above, according to the first embodiment of the present invention, boosting unit 110 can be used each phase A, the B of rotor winding 111b of wound rotor formula induction machine IM and C as inductor, and be controlled at the electric current flowing through in rotor winding 111b by rotor current controller 112 and booster diode unit 113, thereby as booster converter.Voltage after being boosted by boosting unit 110 can be transferred to electric power regeneration unit 120 by counterflow-preventing diode 130.Meanwhile, the voltage after being boosted by boosting unit 110 can have the level higher than the voltage of system power supply 100, thereby for example can obtain, in the situation that there is no the technique effect that the other equipment that boosts (transformer) can be to system power supply 100 regenerative voltages.
In addition, electric power regeneration unit 120 can be exchange (AC) voltage and this AC voltage is offered to system power supply 100 voltage transformation after being boosted by boosting unit 110.Electric power regeneration unit 120 can comprise charging capacitor C and the regeneration inverter that is connected electrical network.Particularly, the regeneration inverter of connection electrical network can be one that from pulse-width modulation (PWM) inverter and 120 degree conduction inverters, selects.
Meanwhile, counterflow-preventing diode 130 can have such configuration: wherein, the anode of its diode is connected to the diode D1 of booster diode unit 113 publicly to the negative electrode of D3, and the negative electrode of its diode is connected to electric power regeneration unit 120.By counterflow-preventing diode 130, can prevent the electric current from electric power regeneration unit 120 to boosting unit 110 reverse flows.
In addition, the anode of the switch element Q1 that surge filter 140 can be configured to be connected to publicly configuration rotor current controller 112 to the other end of Q3 and the diode D1 of booster diode unit 113 to D3.Surge filter 140 can be absorbed in switch element Q1 to the surge voltage producing in the switching manipulation process of Q3, to prevent that switch element Q1 from burning out to Q3.
Surge filter 140 can be configured by capacitor, and the electric capacity of this capacitor can decide according to the size of the size of produced surge voltage and the stray inductance existing to system power supply 100 from counterflow-preventing diode 130.In addition, although clear, according to the surge filter 140 of the first embodiment of the present invention, comprise capacitor, but it is not necessarily limited to this, and it can also be configured to comprise the buffer circuit (snubber circuit) of the combination of capacitor and diode or capacitor, diode and resistor.
Simultaneously, control unit 160 can detection rotor speed 161, voltage, phase place and the frequency 163 of rotor current 162 and rotor, and the information based on detecting produce control signal SWm and SWr with the switch element Q1 that controls rotor current controller 112 to the switch element Q4 of Q3 and electric power regeneration unit 120 to Q9.Each switch element Q1 that can be switched on or switched off rotor current controller 112 by the control signal SWm that produces and SWr is to the switch element Q4 of Q3 and electric power regeneration unit 120 to Q9.Voltage based on spinner velocity 161, rotor current 162 and rotor, phase place and frequency 163 generation control signal SWm and SWr can realize by various algorithms, and as embodiments of the invention, do not describe in detail.
Below, by describe according to first embodiment of the invention for controlling the operating principle of equipment of the rotor current of wound rotor formula induction machine.
With reference to figure 1, therefore can control by being applied to the voltage of system power supply 100 speed and the torque of wound rotor formula induction machine IM, and can be couple to induced voltage in each phase A, the B of stator winding of wound rotor formula induction machine IM and the rotor winding 111b of C at magnetic.
Control unit 160 can detection rotor speed 161, voltage, phase place and the frequency 163 of the electric current 162 flowing through in rotor winding 111b and rotor, and the information based on detecting 161,162 and 163, produces switch element Q1 for controlling rotor current controller 112 control signal SWm and the SWr to the switch element Q4 of Q3 and electric power regeneration unit 120 to Q9.
According to the present embodiment, the switch element Q1 of rotor current controller 112 can repeatedly be turned on and off by the control signal SWm being produced by control unit 160 to Q3, and rotor winding 111b can be used as inductor, thereby the voltage of responding in rotor winding 111b can boost by boosting unit 110.
Particularly, according to the first embodiment of the present invention, each phase A, the B of rotor winding 111b and C can be used as inductor, and three booster converters altogether that therefore, formed respectively by the rotor winding 111b – switch element Q3-diode D3 of the rotor winding 111b – switch element Q1-diode D1 of A phase, the rotor winding 111b – switch element Q2-diode D2 of B phase and C phase can be independent or interrelated carry out work.
For example, in the situation that booster converter module comprises the A Xiang – switch element Q1-diode D1 of rotor winding 111b, when switch element Q1 connects, at the electric current as in the rotor winding 111b of inductor, can increase, and when switch element Q1 turn-offs, the electric current of rotor winding 111b can be boosted and be transferred to electric power regeneration unit 120.
Simultaneously, according to embodiments of the invention, at switch element Q1, to the surge voltage producing in the switching manipulation process of Q3, can absorb by being connected to the surge filter 140 of switch element Q1 to the other end of Q3 and diode D1 to the negative electrode of D3, thereby prevent that switch element Q1 is burned to Q3.
Voltage after being boosted by boosting unit 110 can be transferred to electric power regeneration unit 120, and the voltage being transmitted can be transferred to system power supply 100 from electric power regeneration unit 120.
Electric power regeneration unit 120 can be the regeneration inverter that connects electrical network according to an embodiment of the invention, and particularly, can be one that from pulse-width modulation (PWM) inverter and 120 degree conduction inverters, selects.
In this way, according to embodiments of the invention, can present by the electric energy of responding in the rotor winding at wound rotor formula induction machine is regenerated and can improve the technique effect of the minimizing of energy in using to system power supply.In addition, the voltage of responding in the rotor winding of wound rotor formula induction machine can be boosted, thereby can be presented in the situation that there is no the other equipment that boosts, voltage for regeneration can be arrived to the technique effect of system power supply.
Fig. 2 be illustrate according to a second embodiment of the present invention for controlling the overall arrangement figure of equipment of the rotor current of wound rotor formula induction machine.With Fig. 1 comparison, according to a second embodiment of the present invention for controlling the equipment of the rotor current of wound rotor formula induction machine, may further include phase transition unit 150 and inductance unit 114.In the situation that according to the first embodiment for controlling the equipment of rotor current, in reversal connection or plugging process, when the phase sequence of system power supply is converted into negative-phase sequence when electric power being applied to the stator winding 111a of wound rotor formula induction machine IM, thus in rotor winding 111b, may produce overcurrent to the diode 110,130 of rear class and 140 or switch element 112 and 120 cause damage.Therefore, by describe according to the second embodiment of Fig. 2 for limiting the method for overcurrent.
Below, by specifically describe according to second embodiment of the invention for controlling concrete configuration and the operating principle of equipment of the rotor current of wound rotor formula induction machine.Yet, for the present invention being simplified and clear, the main parts that compared to Figure 1 further comprise at Fig. 2, i.e. phase transition unit 150 and the inductance unit 114 of specifically describing.
First, with reference to figure 2, in order to carry out braking, phase transition unit 150 can be converted to the phase sequence of system power supply 100 negative-phase sequence electric power is offered to the stator winding 111a of wound rotor formula induction machine IM.
For this reason, phase transition unit 150 can comprise the first semiconductor switching module T1 at the two ends with the first-phase A that is connected to stator winding 111a, the second semiconductor switching module T2 with the two ends of the second-phase B that is connected to stator winding 111a, the 3rd semiconductor switching module T3 with the two ends of the third phase C that is connected to stator winding 111a, there is the one end that is connected to second-phase B and the 4th semiconductor switching module T4 that is connected to the other end of third phase C, and there is the one end that is connected to third phase C and the 5th semiconductor switching module T5 that is connected to the other end of second-phase B.
In addition, for excute phase conversion, when the second and the 3rd semiconductor switching module T2 and T3 are switched on, the the 4th and the 5th semiconductor switching module T4 and T5 can be turned off, and when the 4th and the 5th semiconductor switching module T4 and T5 are switched on, the second and the 3rd semiconductor switching module T2 and T3 can be turned off.
Meanwhile, can determine by mathematical equation 1 size of the voltage of responding in rotor winding 111b.
[mathematical equation 1]
Vr=Vs×(Wr/Ws)×S=Vs×(Wr/Ws)×((ws-wr)/ws)
Wherein, Vr is rotor voltage, and Vs is stator voltage, and Wr is the number of turn of rotor winding, and Ws is the number of turn of stator winding, and S is revolutional slip, and ws is synchronizing speed, and wr is spinner velocity.
Here, the size of the voltage of responding in rotor winding 111b is greater than in the situation that the voltage of storing in charging capacitor C big or small, even when the switch element Q1 of rotor current controller 112 is turned off to Q3, excessive charging current also may flow through charging capacitor C by three-phase bridge rectification circuit, and three-phase bridge rectification circuit consists of to Q3 body diode and the switch element Q1 of booster diode unit 113.
In addition,, when the stator winding 111a of wound rotor formula induction machine IM and the ratio of winding between rotor winding 111b are greater than predetermined value, may damage the diode that forms three-phase bridge rectification circuit.Particularly, the in the situation that of reversal connection or plugging, (" reversal connection or plugging " refers to use the torque producing in the direction of the direction of rotation with rotor by the electric power of negative-phase sequence is applied to stator winding 111a, the scheme of the rotation of restrict rotor), in rotor winding 111b, may respond to extra overvoltage.
Therefore, according to embodiments of the invention, the size of the voltage that stator winding 111a is applied can be controlled in phase transition unit 150, to be limited in the size of the electric current flowing through in rotor winding 111b.
For this reason, each in the first semiconductor switching module T1 to the five semiconductor switching module T5 can comprise at least one semiconductor switch, for example TRIAC or thyristor equipment.As example, the bidirectional thyristor with the silicon controlled rectifier (SCR) of a pair of inverse parallel connection shown in Figure 2.
In other words, for the excessive rotor current that prevents from producing when the system power supply 100 of negative-phase sequence is applied to stator winding 111a is effectively to make wound rotor formula induction machine IM braking or to slow down, control unit 160 can apply Trigger Angle signal SWt to phase transition unit 150.After this, can pass through applied Trigger Angle signal SWt and control the first to the 5th semiconductor switching module T1 to T5, can limit the size of the voltage that stator winding 111a is applied.
As mentioned above, according to embodiments of the invention, a pair of silicon controlled rectifier can be carried out two-way control, so that one of them controls positive voltage, and another control negative voltage wherein.Thereby, can present the technique effect that can prevent the overcurrent flowing through and prevent these elements (capacitor, diode etc.) to cause damage simultaneously in the element that is connected to rotor winding 111b (capacitor, diode etc.).
Meanwhile, Fig. 3 is that explanation is according to the big or small torque of voltage and the schematic diagram of the relation between revolutional slip that are applied to the stator winding 111a of wound rotor formula induction machine IM.
Conventionally, the size that is applied to the voltage Vp of stator winding 111a can determine the size of magnetic force (producing the key element of the revolving force (torque) of rotor).Yet when being equal to or greater than predetermined speed according to the rotary speed of ratio of winding rotor, 100% rated voltage cannot be applied to stator, thereby cause producing the torque of q.s.Therefore, as shown in Figure 3, when the rated voltage when 60% is applied to stator, can produce than in the situation that apply the torque of half less amount of the torque of 100% rated voltage.
Therefore, according to another embodiment of the present invention, even by the situation that the trigger angle control in phase transition unit 150 or in the situation that do not have trigger angle control in phase transition unit 150 to increase mutually inductor (please refer to inductance unit 114) to each of rotor winding 111b, can produce the torque of desired amt and overcurrent that can restrict rotor winding 111b.
Particularly, can be by comprising that the inductance unit 114 of inductor of each phase of the rotor winding 111b that is connected to wound rotor formula induction machine IM is controlled at the overcurrent producing in the process of reversal connection or plugging.Below with reference to Fig. 4, provide the description to it.
Can be as shown in Figure 4 corresponding to the equivalent electric circuit of second embodiment of the invention, and in this case, the electric current I r that flows through rotor winding 111b can determine according to mathematical equation 2.
[mathematical equation 2]
Ir = sVr - Vp Rr + js ( Xr + X L ) = sVr - Vp Rr + jsw ( Lr + L L ) = ( sVr - Vp ) ∠ ( - θ ) ( R r 2 + { sw ( Lr + L L ) } 2 ) θ = tan - 1 s ( Xr + X L ) Rr = tan - 1 sw ( Lr + L L ) Rr
Wherein, Vr is the rated voltage of rotor winding, and Rr is the winding resistance of rotor winding, and Xr is the leakage inductance of rotor winding, and Vr is the voltage at the lead-out terminal place of rotor winding, and Ir is the electric current of rotor winding, and Vp is phase voltage, and sVr is system power supply, V fDdiode drop, X lbe the inductance that is connected to the inductor of each phase, S is revolutional slip, and w is spinner velocity, and Lr is the inductor of rotor winding, and L lit is the inductor that is connected to each phase.
As seen, can regulate the electric current I r that flows through rotor winding 111b according to the size that is connected to the inductance of each phase in mathematical equation 2.Here, the size that is connected to the inductor of each phase can be designed as in predetermined maximum.
Fig. 5 is for describing the schematic diagram of the control model of the second embodiment of the present invention shown in Fig. 2.Spinner velocity 501 shown in Figure 5 and rotor torque 502.
In the situation that controlling according to a second embodiment of the present invention, the electric current of two types may contribute to the electric current flowing through in rotor winding 111b, the first is due to the mobile electric current of the increase of the voltage of responding in the rotor winding 111b separating with boosting unit 110, and another is the electric current being raise by boosting unit 110.Therefore, control unit 160 can be below by control phase converting unit 150 and boosting unit 110 in each of describing in period.
First, as shown in Figure 5, period, I indicated acceleration.Particularly, in the starting stage of accelerating, only by the phase control of phase transition unit 150, can increase gradually the voltage of stator winding 111a.Then, when the torque of the quantity that meets the expectation, in the situation that do not control the electric current of rotor winding 111b by rotor current controller 112, only the phase control by phase transition unit 150 just can continue the control of execution to speed.Yet, when not meeting the torque of desired amt, in the situation that there is no the phase control (that is, T1, T2 and T3 or T1, T4 and T5 all connect) of phase transition unit 150, by the Current Control of rotor current controller 112, can carry out the control to speed.
II indication in period constant speed period.Particularly, according to the ratio of winding between stator winding 111a and rotor winding 111b, can change control method.; for example, when ratio of winding low (, the ratio of winding between stator winding 111a and rotor winding 111b is 1:1), the voltage of rotor winding 111b is high; and the torque of desired amt meets, and can only by the phase control of phase transition unit 150, control the electric current of rotor winding 111b.Yet, when ratio of winding is high, the voltage of rotor winding 111b is low, and the torque of desired amt does not meet, can in the situation that the phase control that there is no a phase transition unit 150 (, T1, T2 and T3 or T1, T4 and T5 all connect), only by controlling rotor current controller 112, control the electric current that flows through rotor winding 111b.
The retardation that III indication in period causes due to reversal connection or plugging.Particularly, in the situation that the phase control that there is no a phase transition unit 150 (, T1, T2 and T3 or T1, T4 and T5 all connect) apply the voltage of negative-phase sequence after, only rotor current controller 112 can be controlled to be controlled at the electric current flowing through in rotor winding 111b.
As mentioned above, when wound rotor formula induction machine IM is driven from its inactive state and when the wound rotor formula induction machine IM to rotation status carries out reversal connection or plugging, the frequency of the voltage of exporting from rotor can be equal to or greater than 60Hz.In this case, because the inductance of inductance unit 114 plays great effect thereon, therefore can make voltage-drop and current limit maximum effect.The inductance of inductance unit 114 can greatly reduce in rotary speed reaches preset range or near low frequency region normal speed.With which, according to embodiments of the invention, can present can be by each of rotor winding 111b increased to inductor (please refer to Reference numeral 114) mutually thus according to the change of the frequency of the voltage from rotor winding 111b output, change the technique effect that inductance is stablized whole system.
Although illustrated and described the present invention, having it will be apparent to one skilled in the art that in the situation that do not depart from the spirit and scope of the present invention that limit by the appended claim change of can modifying in conjunction with the embodiments.

Claims (13)

1. for controlling an equipment for the rotor current of wound rotor formula induction machine, described equipment comprises:
Wound rotor formula induction machine; And
Boosting unit, described boosting unit is used the rotor winding of described wound rotor formula induction machine self as inductor, and the voltage of responding in described rotor winding is boosted.
2. equipment according to claim 1, also comprises:
Phase transition unit, is converted to negative-phase sequence in the unit of phase transition described in braking procedure by the phase sequence of system power supply.
3. equipment according to claim 2, also comprises:
Inductance unit, described inductance unit is connected to each phase of the rotor winding of described wound rotor formula induction machine, to be controlled at the overcurrent producing in braking procedure.
4. equipment according to claim 3, wherein said phase transition unit comprises:
The first semiconductor switching module, described the first semiconductor switching module has the two ends of the first-phase that is connected to stator winding;
The second semiconductor switching module, described the second semiconductor switching module has the two ends of the second-phase that is connected to described stator winding;
The 3rd semiconductor switching module, described the 3rd semiconductor switching module has the two ends of the third phase that is connected to described stator winding;
The 4th semiconductor switching module, described the 4th semiconductor switching module has the one end that is connected to described second-phase and the other end that is connected to described third phase; And
The 5th semiconductor switching module, described the 5th semiconductor switching module has the one end that is connected to described third phase and the other end that is connected to described second-phase.
5. equipment according to claim 4, wherein, described the first semiconductor switching module comprises at least one semiconductor switch to each in described the 5th semiconductor switching module.
6. equipment according to claim 4, wherein, when described the second semiconductor switching module and described the 3rd semiconductor switching module connection, described the 4th semiconductor switching module and described the 5th semiconductor switching module turn-off, and when described the 4th semiconductor switching module and described the 5th semiconductor switching module connection, described the second semiconductor switching module and described the 3rd semiconductor switching module turn-off.
7. equipment according to claim 1, also comprises:
Electric power regeneration unit, described electric power regeneration unit by the voltage transmission after being boosted by described boosting unit to system power supply.
8. equipment according to claim 7, wherein said boosting unit comprises:
Rotor current controller, described rotor current controller comprises that switch element is to be controlled at the electric current flowing through in described rotor winding, described switch element has one end of each phase that is connected to described rotor winding; And
Booster diode unit, described booster diode unit comprise diode and by the current delivery from described rotor winding to described electric power regeneration unit, described diode has the anode of each phase that is connected to described rotor winding.
9. equipment according to claim 7, wherein said electric power regeneration unit comprises:
The regeneration inverter that connects electrical network, the regeneration inverter of described connection electrical network becomes exchange (AC) voltage and described AC voltage is offered to described system power supply by the voltage transitions after being boosted by described boosting unit.
10. equipment according to claim 9, the regeneration inverter of wherein said connection electrical network is one that from pulse-width modulation (PWM) inverter and 120 degree conduction inverters, selects.
11. equipment according to claim 7, also comprise:
Counterflow-preventing diode, described counterflow-preventing diode prevents that electric current is from the reverse flow of described electric power regeneration unit to described boosting unit, described counterflow-preventing diode is arranged between described boosting unit and described electric power regeneration unit.
12. equipment according to claim 8, wherein said switch element is at least one that select from comprise the semiconductor switch of igbt (IGBT), field-effect transistor (FET), gate level turn-off thyristor (GTO) and bipolar junction transistor (BJT).
13. equipment according to claim 8, also comprise:
Surge filter, described surge filter is connected to the other end of described switch element and the negative electrode of described diode, and is absorbed in the surge voltage producing in the switching manipulation process of described switch element and burns out to prevent described switch element.
CN201280022263.1A 2011-05-26 2012-05-25 Apparatus for controlling rotor current in a wound-rotor type induction motor Pending CN103582999A (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
KR1020110050069A KR101069140B1 (en) 2011-05-26 2011-05-26 Apparatus for regenearting power of wound-rotor induction motor
KR10-2011-0050069 2011-05-26
KRPCT/KR2011/009255 2011-12-01
PCT/KR2011/009255 WO2012161393A1 (en) 2011-05-26 2011-12-01 Device for recovering power in a wound-rotor induction motor
PCT/KR2012/004155 WO2012161547A2 (en) 2011-05-26 2012-05-25 Apparatus for controlling rotor current in a wound-rotor type induction motor

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CN106505609A (en) * 2015-09-08 2017-03-15 通用电气公司 Wind turbine and the protection system of wind turbine
LT6435B (en) 2015-11-18 2017-08-10 Vanagas Jonas Regulation method of three - phase induction motor with a phase rotor
CN110572096A (en) * 2019-07-22 2019-12-13 中国船舶重工集团公司第七0七研究所 Iron-core-free brushless direct current motor control system and method for high-speed large-inertia load

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EP2916425B1 (en) 2012-10-30 2020-10-21 Bae, Youn-soo Load current regenerating circuit and electrical device having load current regenerating circuit
KR102495535B1 (en) * 2020-12-17 2023-02-07 동성계전 주식회사 Apparatus for controlling output of wound-rotor induction motor

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CN110572096A (en) * 2019-07-22 2019-12-13 中国船舶重工集团公司第七0七研究所 Iron-core-free brushless direct current motor control system and method for high-speed large-inertia load

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WO2012161393A1 (en) 2012-11-29

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