CN202889279U - Brushless doubly fed motor excitation control device - Google Patents
Brushless doubly fed motor excitation control device Download PDFInfo
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- CN202889279U CN202889279U CN2012205401739U CN201220540173U CN202889279U CN 202889279 U CN202889279 U CN 202889279U CN 2012205401739 U CN2012205401739 U CN 2012205401739U CN 201220540173 U CN201220540173 U CN 201220540173U CN 202889279 U CN202889279 U CN 202889279U
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Abstract
The utility model discloses a brushless doubly fed motor excitation control device, which comprises a pulse width modulation (PWM) rectifying unit, a current sensor, a smoothing reactor, a contactor, an excitation controller, an inversion unit, an operation and display unit, an energy storage device, a BOOST reactor and a soft start circuit. When the rotating speed of a brushless rotor is rapidly changed and the load conditions are changed in a large range in the power generation state of the brushless doubly fed motor, the system can always keep variable-speed variable-load constant-frequency constant-voltage power generation; and moreover, the control device can rapidly adjust the rotating speed of the brushless rotor through excitation control in the electric operating state of the brushless doubly fed motor, and multiple electric operating modes such as synchronized operation, asynchronous operation and doubly fed sped regulation are realized. When the load conditions are changed in a large range, the system can always keep the hard mechanical characteristics of the synchronous motor.
Description
Technical field
The utility model relates to a kind of motor automatic control device, particularly relates to a kind of automatic control equipment for brushless dual-feed motor.
Background technology
At present, the research of brushless dual-feed motor design and control system thereof is carried out decades, but some key issues in the unresolved application still, complicated such as brushless dual-feed motor control device model, there are not ready-made control algolithm and control device topological structure, the variation of uprush anticlimax and the brushless rotor speed of load can not be made fast reaction when existing control system was normally moved for brushless dual-feed motor, when loading condition changes in a big way, can not remain the mechanical property that synchronous machine is hard, not have the operational efficiency height, energy-conservation, good stability, the characteristics that reliability is high.Needing manpower intervention, is not closed-loop control system truly.
Existing control system can not guarantee brushless dual-feed motor under the generator operation state, remains the constant frequency and constant voltage generating, can not guarantee under motor-operated running state, realizes brushless rotor speed rapid adjustment.So also there is not so far the report of industrialization in the whole world.
The utility model content
The purpose of this utility model provides a kind of brushless dual-feed motor excitation controlling device, solves the control device complex structure of brushless dual-feed motor, function singleness, the technical problem of bad adaptability.
Brushless dual-feed motor excitation controlling device of the present utility model, wherein: comprise PWM rectification unit, current sensor, smoothing reactor, contactor, excitation controller and inversion unit, operation and display unit, energy storage device, BOOST reactor, soft starting circuit;
The PWM rectification unit comprises the first voltage detecting circuit that connects by data-interface, and the signal input part of the first voltage detecting circuit is as the second three-phase input end of PWM rectification unit, and the PWM rectification unit also comprises the first three-phase input end;
Excitation controller and inversion unit comprise excitation controller, inversion unit, current detection circuit and second voltage testing circuit, be connected by data-interface between excitation controller and encoder, double feedback electric engine angular velocity signal and angular displacement signal that the received code device gathers, be connected by data-interface between excitation controller and inversion unit, excitation controller sends pwm signal to inversion unit, inversion unit just, the negative current input is just connecting, negative dc bus, the three-phase output end of inversion unit is as the first three-phase output end of excitation controller and inversion unit, current detection circuit is connected by data-interface with the second voltage testing circuit and is connected with excitation controller, and the signal input part of second voltage testing circuit is as the first three-phase input end of excitation controller and inversion unit;
The first three-phase input end of PWM rectification unit is sequentially connected and is connected the power winding of brushless dual-feed motor behind BOOST reactor, soft starting circuit, the smoothing reactor, the dc output end of PWM rectification unit connects the direct-flow input end of excitation controller and inversion unit by the positive and negative electrode dc bus, excitation controller is connected the control winding of brushless dual-feed motor with the first three-phase output end of inversion unit, energy storage device in parallel on the positive and negative electrode dc bus that the dc output end of PWM rectification unit connects;
The voltage change signal of three-phase line between the power winding that the first three-phase input end of excitation controller and inversion unit receives brushless dual-feed motor and first three-phase input end of PWM rectification unit, excitation controller and inversion unit by current detection circuit reception brushless dual-feed motor the power winding and the first three-phase input end of PWM rectification unit between the current changing signal of three-phase line;
The voltage change signal of three-phase line between the power winding of the second three-phase input end reception brushless dual-feed motor of PWM rectification unit and the first three-phase input end of PWM rectification unit;
Be connected by communication port between excitation controller and inversion unit and operation and display unit; Contactor one end is connected on the three-phase line between smoothing reactor and soft starting circuit, a kind of being connected in the other end and electrical network, electrical load, power supply or the local power net.
Described BOOST reactor directly is connected between PWM rectification unit and the soft starting circuit, perhaps and non-capacitive element be connected between PWM rectification unit and the soft starting circuit.
Also comprise isolating transformer, be connected on the three-phase line between smoothing reactor and soft starting circuit.
Also comprise the reserve DC power supply, be connected in parallel on the positive and negative electrode dc bus that the dc output end of PWM rectification unit connects.
A kind of control device is that the three-phase line that the first three-phase input end of described PWM rectification unit is drawn links to each other with the three phase power winding of brushless double feed induction generator by BOOST reactor, soft starting circuit, isolating transformer, current sensor, smoothing reactor successively, and the three-phase line that the second three-phase input end of PWM rectification unit is drawn directly is connected between soft starting circuit and the isolating transformer; The positive and negative dc bus of the dc output end of PWM rectification unit and positive and negative input corresponding link to each other of excitation controller with inversion; On the positive and negative busbar between PWM rectification unit and excitation controller and the inversion unit and be connected with energy storage device;
Excitation controller links to each other with the control winding of brushless double feed induction generator DFIG with the three-phase line that the first three-phase output end of inversion unit is drawn, and the three-phase line that the first three-phase input end of excitation controller and inversion unit is drawn directly is connected on the three-phase line between the isolating transformer current sensor; The output of the current sensor on the three-phase line is connected with the input of current detection circuit;
Link to each other by the CAN serial communication between operation and display unit and excitation converter and the inversion unit; Encoder links to each other with the brushless rotor of brushless dual-feed motor; One end of contactor is connected on the three-phase line between isolating transformer and the current sensor, the contactor other end links to each other with electrical network or electrical load, prime mover utilizes mechanical drive mode to pass through the raising speed case to be connected with brushless double feed generator DFIG, and prime mover provides the generator operation required drive for brushless double feed generator;
Reserve DC power supply in parallel on the positive and negative busbar between PWM rectification unit and excitation controller and the inversion unit, also string has by a contactor K and the small-sized soft starting circuit that resistance R consists of on the output positive bus-bar of reserve DC power supply.
The three-phase line that the first three-phase input end that another kind of control device is described PWM rectification unit is drawn links to each other with the three phase power winding of brushless double feed induction motor DFIM by BOOST reactor, soft starting circuit, isolating transformer, smoothing reactor, current sensor successively, and the three-phase line that the second three-phase input end of PWM rectification unit is drawn directly is connected between soft starting circuit and the isolating transformer; The positive and negative dc bus of the dc output end of PWM rectification unit and positive and negative input corresponding link to each other of excitation controller with inversion; Energy storage device in parallel on the positive and negative busbar between PWM rectification unit and excitation controller and the inversion unit;
Excitation controller links to each other with the control winding of brushless double feed induction motor DFIM with the three-phase line that the first three-phase output end of inversion unit is drawn, and the three-phase line that the first three-phase input end of excitation controller and inversion unit is drawn directly is connected on the three-phase line between isolating transformer and the smoothing reactor; The output of the current sensor on the three-phase line is connected with the input of current detection circuit;
Link to each other by the CAN serial communication between operation and display unit and excitation converter and the inversion unit; Encoder links to each other with the brushless rotor of brushless dual-feed motor; One end of contactor is connected on the three-phase line between isolating transformer and the smoothing reactor, and the contactor other end links to each other with electrical network or power supply, and the brushless double feed induction motor is connected with line load by mechanical drive mode, for line load provides power.
Described energy storage device, can be one or more in the battery pack of being furnished with the DC/DC conversion, super capacitor, high-energy capacitor, electrochemical capacitor, lead acid accumulator, nickel-cadmium cell, Ni-MH battery, flow battery, sodium-sulphur battery, the lithium ion battery, annexation be a kind of in series, parallel, the series-parallel connection.
Described soft starting circuit adopts a kind of in three-phase soft start and two kinds of connected modes of two-phase soft start,
The three-phase soft starting circuit is made of resistance R 2, resistance R 3, resistance R 4 and three contact contactor K2, resistance R 2, resistance R 3, resistance R 4 are connected on respectively on three three-phase AC lines, and three contacts of K2 contactor are in parallel with resistance R 2, resistance R 3, resistance R 4 respectively;
The two-phase soft starting circuit is made of two resistance R 5, resistance R 6 and a double-contact contactor K3, and resistance R 5, resistance R 6 are connected on any two of the three-phase AC line, and two contacts of double-contact contactor K3 are in parallel with resistance R 5, resistance R 6 respectively.
The connected mode of described isolating transformer is:
Primary side is Angle connection, and secondary side is Y-connection;
Or primary side is Angle connection, and secondary side is Angle connection;
Or primary side is Y-connection, and secondary side is Angle connection;
Or primary side is Y-connection, and secondary side is Y-connection.
Described current sensor adopts Hall current sensor, can adopt two current sensors to any two-phase circuit difference collection signal in the three-phase line, or adopt three current sensors to the difference of the three-phase line in three-phase line collection signal.
It is technical that brushless dual-feed motor excitation controlling device of the present utility model both can be applied to the generator operation of brushless dual-feed motor, and the electric operation that can also be applied to brushless dual-feed motor is technical.So that brushless dual-feed motor is under the generator operation state, control device changes and loading condition when changing in a big way in fast in brushless rotor speed, can remain that speed change variable load constant frequency and constant voltage generates electricity; Brushless dual-feed motor is under motor-operated running state, and control device can be controlled by excitation, finishes brushless rotor speed rapid adjustment, realizes the multiple electric operation modes such as synchronous operation, asynchronous operation and doubly-fed adjustable speed.And no matter motor is under generator operation or motor-operated running state, when loading condition changed in a big way, this system can remain the mechanical property that synchronous machine is hard, had operational efficiency height, energy-conservation, good stability, characteristics that reliability is high.
Brushless dual-feed motor excitation controlling device superiority of the present utility model and technique effect are:
(1) brushless dual-feed motor control system structure and method are provided;
(2) in the time of can solving load changing, the exciter converter trip problem;
(3) when load is undergone mutation, improved the stability of a system, system can both keep stable under any load, any operating mode;
(4) solved the crossing problem of low-voltage, the brushless double feed electricity generation system before has revolutionary progress;
(5) because this system can be applied to the closed-loop control system of any Mathematical Models based on brushless dual-feed motor, so the variation of system uprush anticlimax and brushless rotor speed of load can be to normal operation the time is made a response fast.
Can realize the accurate control of brushless dual-feed motor under various operating modes.
Below in conjunction with accompanying drawing embodiment of the present utility model is described further.
Description of drawings
Fig. 1 is the topological structure schematic diagram of the utility model brushless dual-feed motor excitation controlling device embodiment 1 and brushless double feed induction generator;
Fig. 2 is the topological structure schematic diagram of the utility model brushless dual-feed motor excitation controlling device embodiment 2 and brushless double feed induction motor;
Fig. 3 is that brushless dual-feed motor excitation controlling device embodiment 1 of the present invention is applied to the wind turbine power generation topological structure schematic diagram in when operation;
Fig. 4 is the topological structure schematic diagram of brushless dual-feed motor excitation controlling device embodiment 1 of the present invention when being applied to the axle generator generator operation;
Fig. 5 is the topological structure schematic diagram of brushless dual-feed motor excitation controlling device embodiment 2 of the present invention when being applied to the driving force motor electric operation;
Fig. 6 is the syndeton schematic diagram of soft starting circuit embodiment 1 in the utility model brushless dual-feed motor excitation controlling device;
Fig. 7 is the syndeton schematic diagram of soft starting circuit embodiment 2 in the utility model brushless dual-feed motor excitation controlling device;
Fig. 8 is the syndeton schematic diagram of reserve DC power supply embodiment 1 in the utility model brushless dual-feed motor excitation controlling device;
Fig. 9 is the syndeton schematic diagram of reserve DC power supply embodiment 2 in the utility model brushless dual-feed motor excitation controlling device;
Figure 10 is the syndeton schematic diagram of isolating transformer embodiment 1 in the utility model brushless dual-feed motor excitation controlling device;
Figure 11 is the syndeton schematic diagram of isolating transformer embodiment 2 in the utility model brushless dual-feed motor excitation controlling device;
Figure 12 is the syndeton schematic diagram of isolating transformer embodiment 3 in the utility model brushless dual-feed motor excitation controlling device;
Figure 13 is the syndeton schematic diagram of isolating transformer embodiment 4 in the utility model brushless dual-feed motor excitation controlling device;
Figure 14 is the syndeton schematic diagram of current sensor embodiment 1 in the utility model brushless dual-feed motor excitation controlling device;
Figure 15 is the syndeton schematic diagram of current sensor embodiment 2 in the utility model brushless dual-feed motor excitation controlling device.
Embodiment
Brushless dual-feed motor excitation controlling device of the present utility model comprises PWM rectification unit, current sensor, smoothing reactor, contactor, excitation controller and inversion unit, operation and display unit, energy storage device, BOOST reactor, soft starting circuit;
The PWM rectification unit comprises the first voltage detecting circuit that connects by data-interface, and the signal input part of the first voltage detecting circuit is as the second three-phase input end of PWM rectification unit, and the PWM rectification unit also comprises the first three-phase input end;
Excitation controller and inversion unit comprise excitation controller, inversion unit, current detection circuit and second voltage testing circuit, be connected by data-interface between excitation controller and encoder, double feedback electric engine angular velocity signal and angular displacement signal that the received code device gathers, be connected by data-interface between excitation controller and inversion unit, excitation controller sends pwm signal to inversion unit, inversion unit just, the negative current input is just connecting, negative dc bus, the three-phase output end of inversion unit is as the first three-phase output end of excitation controller and inversion unit, current detection circuit is connected by data-interface with the second voltage testing circuit and is connected with excitation controller, and the signal input part of second voltage testing circuit is as the first three-phase input end of excitation controller and inversion unit;
The first three-phase input end of PWM rectification unit is sequentially connected and is connected the power winding of brushless dual-feed motor behind BOOST reactor, soft starting circuit, the smoothing reactor, the dc output end of PWM rectification unit connects the direct-flow input end of excitation controller and inversion unit by the positive and negative electrode dc bus, excitation controller is connected the control winding of brushless dual-feed motor with the first three-phase output end of inversion unit, energy storage device in parallel on the positive and negative electrode dc bus that the dc output end of PWM rectification unit connects;
The voltage change signal of three-phase line between the power winding that the first three-phase input end of excitation controller and inversion unit receives brushless dual-feed motor and first three-phase input end of PWM rectification unit, excitation controller and inversion unit by current detection circuit reception brushless dual-feed motor the power winding and the first three-phase input end of PWM rectification unit between the current changing signal of three-phase line;
The voltage change signal of three-phase line between the power winding of the second three-phase input end reception brushless dual-feed motor of PWM rectification unit and the first three-phase input end of PWM rectification unit;
Be connected by communication port between excitation controller and inversion unit and operation and display unit; Contactor one end is connected on the three-phase line between smoothing reactor and soft starting circuit, a kind of being connected in the other end and electrical network, electrical load, power supply or the local power net.
The BOOST reactor directly is connected between PWM rectification unit and the soft starting circuit, perhaps and non-capacitive element be connected between PWM rectification unit and the soft starting circuit.
Also comprise isolating transformer, be connected on the three-phase line between smoothing reactor and soft starting circuit.
Also comprise the reserve DC power supply, be connected in parallel on the positive and negative electrode dc bus that the dc output end of PWM rectification unit connects.
As shown in Figure 1, among the utility model brushless dual-feed motor excitation controlling device embodiment 1, as shown in Figure 1, when brushless dual-feed motor carried out generator operation as brushless double feed induction generator DFIG, the brushless dual-feed motor excitation controlling device was connected between the control winding 3 and power winding 4, reserve DC power supply 1, encoder 9, electrical network or electrical load, prime mover and raising speed case of a brushless double fed shaft generator DFIG.The brushless dual-feed motor excitation controlling device is comprised of PWM rectification unit 2, excitation controller and inversion unit 10, energy storage device 12, BOOST reactor 13, soft starting circuit 14, isolating transformer 15, smoothing reactor 6, current sensor 5, contactor 7, operation and display unit 11 etc.;
PWM rectification unit 2 comprises the signal input part of the first voltage detecting circuit 17, the first voltage detecting circuits 17 that connect by data-interface as the second three-phase input end of PWM rectification unit 2, and PWM rectification unit 2 also comprises the first three-phase input end;
Excitation controller and inversion unit 10 comprise excitation controller, inversion unit, current detection circuit 19 and second voltage testing circuit 18, excitation controller is connected by data-interface with 9 of encoders, double feedback electric engine angular velocity signal and angular displacement signal that received code device 9 gathers, be connected by data-interface between excitation controller and inversion unit, excitation controller sends pwm signal to inversion unit, the direct current input of inversion unit is just connecting, negative dc bus, the three-phase output end of inversion unit is as the first three-phase output end of excitation controller and inversion unit 10, current detection circuit 19 is connected with the second voltage testing circuit and is connected with excitation controller by data-interface respectively, and the signal input part of second voltage testing circuit 18 is as the first three-phase input end of excitation controller and inversion unit 10;
The three-phase line that the first three-phase input end of PWM rectification unit 2 is drawn links to each other with the three phase power winding 4 of brushless double feed induction generator DFIG by BOOST reactor 13, soft starting circuit 14, isolating transformer 15, current sensor 5, smoothing reactor 6 successively, and the three-phase line that the second three-phase input end of PWM rectification unit 2 is drawn directly is connected between soft starting circuit 14 and the isolating transformer 15; The positive and negative dc bus of the dc output end of PWM rectification unit 2 and positive and negative input corresponding link to each other of excitation controller with inversion 10; On the positive and negative busbar between PWM rectification unit 2 and excitation controller and the inversion unit 10 and be connected with energy storage device 12;
Excitation controller links to each other with the control winding 3 of brushless double feed induction generator DFIG with the three-phase line that the first three-phase output end of inversion unit 10 is drawn, and the three-phase line that the first three-phase input end of excitation controller and inversion unit 10 is drawn then directly is connected on the three-phase line between isolating transformer 15 and the current sensor 5; The output of the current sensor 5 on the three-phase line is connected with the input of current detection circuit 19;
Mode by the CAN serial communication between operation and display unit 11 and excitation converter and the inversion unit 10 links to each other; Encoder 9 links to each other with the brushless rotor of brushless dual-feed motor; One end of contactor 7 is connected on the three-phase line between isolating transformer 15 current sensors 5, contactor 7 other ends link to each other with electrical network or electrical load, prime mover utilizes mechanical drive mode to pass through the raising speed case to be connected with brushless double feed generator DFIG, and prime mover provides the generator operation required drive for brushless double feed generator;
Reserve DC power supply 1 is gone back and be connected with to positive and negative busbar between PWM rectification unit 2 and excitation controller and inversion unit 10, and also going here and there on the output positive bus-bar of reserve DC power supply 1 simultaneously has by a contactor K1 and the small-sized soft starting circuit that resistance R 1 consists of.
As shown in Figure 2, among the utility model brushless dual-feed motor excitation controlling device embodiment 2, when brushless dual-feed motor carried out electric operation as brushless double feed induction motor DFIM, the brushless dual-feed motor excitation controlling device was connected in the control winding 3 of a brushless double-fed motor DFIM and power winding 4 thereof, this unit of reserve direct current 1(is selectable unit), between encoder 9, electrical network or power supply, the line load.The brushless dual-feed motor excitation controlling device is comprised of PWM rectification unit 2, excitation controller and inversion unit 10, energy storage device 12, BOOST reactor 13, soft starting circuit 14, isolating transformer 15, smoothing reactor 6, current sensor 5, contactor 7, operation and display unit 11 etc.;
PWM rectification unit 2 comprises the signal input part of the first voltage detecting circuit 17, the first voltage detecting circuits 17 that connect by data-interface as the second three-phase input end of PWM rectification unit 2, and PWM rectification unit 2 also comprises the first three-phase input end;
Excitation controller and inversion unit 10 comprise excitation controller, inversion unit, current detection circuit 19 and second voltage testing circuit 18, excitation controller is connected by data-interface with 9 of encoders, double feedback electric engine angular velocity signal and angular displacement signal that received code device 9 gathers, be connected by data-interface between excitation controller and inversion unit, excitation controller sends pwm signal to inversion unit, the direct current input of inversion unit is just connecting, negative dc bus, the three-phase output end of inversion unit is as the first three-phase output end of excitation controller and inversion unit 10, current detection circuit 19 is connected with the second voltage testing circuit and is connected with excitation controller by data-interface respectively, and the signal input part of second voltage testing circuit 18 is as the first three-phase input end of excitation controller and inversion unit 10;
The three-phase line that the first three-phase input end of PWM rectification unit 2 is drawn links to each other with the three phase power winding 4 of brushless double feed induction motor DFIM by BOOST reactor 13, soft starting circuit 14, isolating transformer 15, smoothing reactor 6, current sensor 5 successively, and the three-phase line that the second three-phase input end of PWM rectification unit 2 is drawn directly is connected between soft starting circuit 14 and the isolating transformer 15; The positive and negative dc bus of the dc output end of PWM rectification unit 2 and positive and negative input corresponding link to each other of excitation controller with inversion 10; On the positive and negative busbar between PWM rectification unit 2 and excitation controller and the inversion unit 10 and be connected with energy storage device 12;
Can also access reserve DC power supply 1 in parallel on the positive and negative busbar between PWM rectification unit and excitation controller and the inversion unit as selectable unit (SU), the steady parking of motor in the time of can realizing having a power failure suddenly;
Excitation controller links to each other with the control winding 3 of brushless double feed induction motor DFIM with the three-phase line that the first three-phase output end of inversion unit 10 is drawn, and the three-phase line that the first three-phase input end of excitation controller and inversion unit 10 is drawn directly is connected on the three-phase line between isolating transformer 15 and the smoothing reactor 6; The output of the current sensor 5 on the three-phase line is connected with the input of current detection circuit 19;
Mode by the CAN serial communication between operation and display unit 11 and excitation converter and the inversion unit 10 links to each other; Encoder 9 links to each other with the brushless rotor of brushless dual-feed motor; One end of contactor 7 is connected on the three-phase line between isolating transformer 15 and the smoothing reactor 6, contactor 7 other ends link to each other with electrical network or power supply, brushless double feed induction motor DFIM is connected with line load by mechanical drive mode, for line load provides power.
As shown in Figure 3, brushless dual-feed motor mainly is that the electric energy that wind power generation produces is supplied with electrical network in wind power generation field, on the basis of the embodiment of the invention 1, prime mover is replaced by wind motor, electrical network is replaced by in electrical load, and the brushless dual-feed motor excitation controlling device just can be applied to wind generator system.
As shown in Figure 4, brushless dual-feed motor mainly is that the electric energy that shaft generator produces is supplied with local power net or electrical load in the shaft generator field, such as boats and ships shaft generator, on the basis of the embodiment of the invention 1, prime mover 16 is replaced by axle band engine, and the brushless dual-feed motor excitation controlling device just can be applied to Shaft-Generator.
As shown in Figure 5, among the utility model brushless dual-feed motor excitation controlling device embodiment 5, it is comparatively common that the three-phase alternating current electrical network moves required power supply as motor, on the basis of the embodiment of the invention 2, power supply is replaced by electrical network, the brushless dual-feed motor excitation controlling device just can be applied to mains supply and carry out electric operation, utilizes the three-phase alternating current electrical network to move required power supply as motor.
In above embodiment, the effect of reserve DC power supply 1 is when brushless dual-feed motor carries out generator operation as brushless double feed induction generator DFIG, reserve DC power supply 1 provides exciting current for the generator operation excitation of brushless double feed induction generator DFIG, after brushless double feed generator DFIG generator operation is steady, can also partly store by the mode that recharges the unnecessary electric energy in the circuit in the power generation process.When brushless dual-feed motor carries out electric operation as brushless double feed induction motor DFIM, the effect of reserve DC power supply 1 can make brushless double feed induction motor DFIM steadily stop in the situation of suddenly outage of power supply, reduce to lose because of the raw material that technical process interrupts suddenly causing, avoid the damage of equipment.If omit reserve DC power supply 1 and connecting circuit thereof, can not affect the normal electric operation of brushless double feed induction motor DFIM.
PWM rectification unit 2 has adopted the three-phase bridge rectification circuit that consists of based on igbt (IGBT).Be used for regulating the current waveform of included PWM rectifier three-phase input end, reduce total current harmonic distortion (THDi), the harmonic reduction distortion improves power factor.Make total power factor near 1, and then reduce the loss of electric machine, improve the active power fan-out capability of brushless dual-feed motor.The break-make modulation power semiconductor device that PWM rectification unit 2 is used for PWM copped wave can also adopt the multiple devices such as silicon controlled rectifier (SCR), gate electrode capable of switching off device (GTO), power transistor (GTR), MOSFET (PowerMOSFET), igbt (IGBT), integrated gate commutated thyristor (IGCT), SGCT (SGCT).PWM rectification unit control logic can adopt the control of voltage oriented control, virtual flux linkage orientation, based on the direct Power Control of voltage, a kind of based in the control strategies such as direct Power Control of virtual magnetic linkage.
PWM rectification unit 2 has consisted of three-phase PFC circuit of power factor correction jointly with BOOST reactor 13, this three-phase PFC can regulate the current waveform of PWM rectifier three-phase input end, make input current average value automatically follow the all-wave voltage reference, be sinusoidal wave, and phase difference is zero, make input impedance be pure resistive, thereby realize that its total power factor is 1, reduced total current harmonic distortion (THD), the harmonic reduction distortion, improve power factor, and then reduce the loss of electric machine, improved the active power fan-out capability of brushless dual-feed motor.Output voltage is constant, realizes the unity power factor operation, can also realize the electric energy feedback electrical network, and making output voltage is approximate level and smooth VD.The three-phase alternating current of brushless dual-feed motor power winding 4 ends is rectified into approximate level and smooth direct current and supplies with the direct current positive and negative busbar the most at last.
The first voltage detecting circuit 17, effect are the voltage by brushless double-fed acc power winding 4 ends of real-time detection, and follow the tracks of its amplitude, make PWM rectification unit 2 adjust the commutating voltage of direct current positive and negative busbar.As the signal input of PWM rectification unit 2, the first voltage detecting circuit 17 is PWM rectification unit 2 input pwm signal ripples, reaches the current waveform of regulating PWM rectifier three-phase input end, the purpose of modulation (PWM) output pulse width;
In excitation controller and the inversion unit 10 effect of excitation controller be based on brushless dual-feed motor Mathematical Modeling adopt rotating speed, the current double closed-loop control algolithm, utilize and adopt scalar control, direct torque control, vector control, fuzzy control, the control strategies such as PID ANN Control, motor angular velocity and angular displacement signal according to brushless dual-feed motor encoder 9 feedbacks, the current signal that current detection circuit 19 detects, the voltage signal that second voltage testing circuit 18 detects, to inversion unit output PWM excitation signal, realize regulating according to control winding three-phase current amplitude the amplitude size of control inversion unit output current; Regulate the output frequency of controlling the inversion unit output current according to control winding current angular frequency, the control sense of current.Thereby by voltage, frequency, electric current and direction realization thereof the control to brushless dual-feed motor.Inversion unit is according to the given excitation signal of excitation controller, with the three-phase alternating current that the dc inverter on the direct current positive and negative busbar is amplitude, frequency, phase sequence is adjustable, and offers the control winding 3 of brushless dual-feed motor.Current detection circuit 19 connects the current sensor 5 of brushless double-fed acc power winding 4 ends, and the current information that current sensor 5 is detected offers excitation controller, for detection of load current and realization feedfoward control.Second voltage testing circuit 18 offers excitation controller with brushless double-fed acc power winding 4 terminal voltage amplitude informations.
Electric energy is dynamically stored and exported to energy storage device 12, makes PWM rectification unit DC side be low-impedance voltage source characteristic.At brushless dual-feed motor during as brushless double feed induction generator DFIG generator operation, can be that three-phase alternating current is that the generator operation of brushless double feed induction generator DFIG carries out excitation with the direct current energy inversion that stores by inversion unit, after the generator excitation is finished, can also store the unnecessary electric energy after electrical network or electrical load are supplied in the generator generating, and can be when needs improve the voltage of generator DFIG control winding 3 ends, with the electric energy feedback of storage to the direct current positive and negative busbar; At brushless dual-feed motor during as brushless double feed induction motor DFIM electric operation, change according to line load, need in time regulate the voltage of brushless double-fed motor DFIM control winding 3 ends, so excitation controller and inversion unit 10 can obtain required electric energy from the direct current positive and negative busbar as required, energy storage device 12 this moment dynamic stored balance electric energy or export the vacancy electric energy just in time.Especially at impact, prominent when unloading load, exciting power can be undergone mutation, and energy storage device has solved this problem well, improves the robustness of system.
Encoder 9 is magnetic coder or photoelectric encoder, measures the rotary speed of brushless dual-feed motor in the brushless dual-feed motor operation process, and feeds back to excitation controller.
Isolating transformer 15 is selectable unit; if do not select isolating transformer 15; the brushless dual-feed motor excitation controlling device still can work; if select isolating transformer 15 to be conducive to make the electric fully insulation of primary side and secondary side; import control loop into thereby suppress the high frequency clutter, isolating transformer suspends secondary over the ground, also makes this loop isolation; can increase insulation, play the effect of protection, lightning protection, filtering, protection personal safety.
Operation with show 11 and excitation converter and inversion unit 10 between mode by serial communication link to each other, this communication modes can be a kind of in the communication modes such as Canbus communication, Modbus communication, RS485 communication, RS232 communication.Its effect is to be responsible for partly carrying out communication with excitation controller, is used for the setting of excitation controller partial parameters, parameter display such as output voltage, output frequency, power output etc.
Current sensor 5 is Hall current sensor, by the electric current in the real-time detection power of motor end three-phase AC line, is used for regulating the excitation signal output of excitation controller part.
Smoothing reactor 6 for the harmful ripple that suppresses three-phase alternating current, also can increase short-circuit resistance simultaneously, limiting short-circuit current, and can reduce to cause the probability of Commutation Failure because alternating voltage descends.
Contactor 7 is A.C. contactor,, finishes electrical network or power supply access during as brushless double feed induction motor DFIM electric operation at brushless dual-feed motor; Brushless dual-feed motor is finished electrical network or electrical load access during as brushless double feed induction generator DFIG generator operation.Can be a kind of in air type electromagnetic contactor, vacuum contactor, semiconductor contactor, the permanent magnet contactor.
Prime mover utilizes the modes such as machine driving such as connecting shaft, belt, gear, chain, bent axle to provide motive power by the raising speed case for the generator operation of brushless double feed induction generator DFIG.Brushless double feed induction motor DFIM provides machine power by modes such as machine driving such as connecting shaft, belt, gear, chain, bent axles for line load.Prime mover can be a kind of in Thermal Motor, hydraulic motor, wind motor and the motor.Described brushless dual-feed motor is during as brushless double feed induction motor DFIM electric operation, and power source is the three-phase alternating current electrical network, or threephase alternator.
As shown in Figure 6, in the utility model brushless dual-feed motor excitation controlling device among the soft starting circuit embodiment 1, the three-phase soft starting circuit is made of resistance R 2, resistance R 3, resistance R 4 and three contact contactor K2, resistance R 2, resistance R 3, resistance R 4 are connected on respectively on three three-phase AC lines, and three groups of contacts of K2 contactor are in parallel with resistance R 2, resistance R 3, resistance R 4 respectively.
As shown in Figure 7, in the utility model brushless dual-feed motor excitation controlling device among the soft starting circuit embodiment 2, the two-phase soft starting circuit is made of two resistance R 5, resistance R 6 and a double-contact contactor K3, resistance R 5, resistance R 6 can be connected on any two of the three-phase AC line, and two groups of contacts of double-contact contactor K3 are in parallel with resistance R 5, resistance R 6 respectively.
As shown in Figure 8, among the reserve DC power supply embodiment 1, adopt battery or the battery pack of one of kinds such as dry cell, lead acid accumulator, nickel-cadmium cell, Ni-MH battery, flow battery, sodium-sulphur battery, lithium ion battery that the reserve direct current is provided in the utility model brushless dual-feed motor excitation controlling device.As shown in Figure 9, among the reserve DC power supply embodiment 2, the direct current that employing exchanges after the rectification of ups power process rectification unit provides the reserve direct current in the utility model brushless dual-feed motor excitation controlling device.
As shown in figure 10, among the isolating transformer embodiment 1, primary side is Angle connection in the utility model brushless dual-feed motor excitation controlling device, and secondary side is Y-connection.As shown in figure 11, among the isolating transformer embodiment 2, primary side is Angle connection in the utility model brushless dual-feed motor excitation controlling device, and secondary side is Angle connection.
As shown in figure 12, among the isolating transformer embodiment 3, primary side is Y-connection in the utility model brushless dual-feed motor excitation controlling device, and secondary side is Angle connection.
As shown in figure 13, among the isolating transformer embodiment 4, primary side is Y-connection in the utility model brushless dual-feed motor excitation controlling device, and secondary side is Y-connection.
According to Hall base husband current law iu+iv+iw=0, as long as measure the electric current of any two-phase on the three-phase AC line, just can calculate the third phase size of current.
As shown in figure 14, among the current sensor embodiment 1, be in series with respectively three current sensors 5 on the three-phase line in the utility model brushless dual-feed motor excitation controlling device, each current sensor 5 is the signal of output collection separately.
As shown in figure 15, among the current sensor embodiment 2, be in series with respectively two current sensors 5 on any two circuits of three-phase line in the utility model brushless dual-feed motor excitation controlling device, each current sensor 5 is the signal of output collection separately.
Utilize the control procedure of brushless dual-feed motor excitation controlling device of the present utility model excitation:
When (1) brushless dual-feed motor is as generator, prime mover provides motive power by mechanically operated mode for it, reserve DC power supply and energy storage device provide the exciting current source, direct current energy on the direct current positive and negative busbar provides amplitude by excitation controller and inversion unit, frequency, the three-phase alternating current that phase sequence is adjustable, exciting current as the control winding, if the closed connection of contactor this moment electrical load, then carry excitation for band, when Bands carries excitation, transient high power when energy storage device provides band to carry startup, large electric current, if contactor disconnected and disconnected electrical load this moment, it then is unloaded excitation;
When (2) brushless dual-feed motor was as motor, closed contactor was connected electrical network or power supply, can realize the multiple electric operation modes such as asynchronous electric operation, synchronous electric operation, doubly-fed adjustable speed.
Asynchronous electric operation: when the power winding connects three-phase alternating current, offer the size of power winding current by regulating excitation controller, just can change motor speed.
Synchronous electric operation: when the power winding connects three-phase alternating current, frequency by adjusting control winding is zero, and excitation controller need to be provided for for the control winding direct current of excitation, motor rotation is under the frequency of three-phase alternating current, this moment, the rotating speed of motor was exactly the nature synchronous speed, and what this moment, motor carried out is the synchronous electric operation of nature; When metasynchronism speed electric operation is, the part slip power feeds back on the positive and negative dc bus through excitation controller and inversion unit, charges for energy storage device or reserve DC power supply; When supersynchronous fast electric operation, power winding and control winding power supply are all carried active power to machine shaft.
Doubly-fed adjustable speed: when the power of motor winding connects the three-phase alternating current electrical network, the control winding connects the excitation converter part, by changing the output frequency of excitation controller part, get final product the regulating electric machine rotating speed, by frequency of supply and the power winding that changes the control winding and the phase sequence of controlling winding, can make the rotating speed of motor be higher or lower than synchronizing speed.
Utilize brushless dual-feed motor excitation controlling device constant frequency generation method of the present utility model:
Brushless dual-feed motor is during as the generator generator operation, excitation controller is according to prime mover rotating speed that encoder records, and the output voltage frequency of regulating in real time inversion unit makes the three-phase alternating current frequency of brushless dual-feed motor output remain on the frequency of 50Hz/60Hz and other users expectation.The output voltage frequency of inversion unit is proportional to the poor of prime mover rotating speed and brushless double feed generator DFIG rotating speed, when prime mover rotating speed is lower than the synchronous speed per hour of brushless double feed generator DFIG, and excitation controller control inversion unit output negative-phase sequence; When prime mover rotating speed is higher than the synchronous speed per hour of brushless double feed generator DFIG, excitation controller control inversion unit output positive phase sequence; When prime mover rotating speed equaled brushless double feed generator DFIG synchronizing speed, excitation controller control inversion unit output frequency was 0Hz, realized that the realization of brushless dual-feed motor excitation controlling device control brushless dual-feed motor is with the synchronous speed frequency power generation.
Utilize brushless dual-feed motor excitation controlling device constant voltage electricity-generating method of the present utility model:
Brushless dual-feed motor is during as generator DFIG generator operation, brushless double-fed acc power winding output voltage values and current exciting current frequency that excitation controller is corresponding according to the second voltage testing circuit, regulate in real time the output voltage amplitude of inversion unit, make brushless double-fed acc power winding output AC voltage effective value maintain the magnitude of voltage of 380V or other users expectation.
Utilize brushless dual-feed motor excitation controlling device electric speed regulation method of the present utility model:
Brushless dual-feed motor is during as motor DFIM electric operation, by regulating the frequency of control winding, very easily regulating electric machine rotating speed.When control winding frequency is 0Hz, and excitation controller need to be provided for for the control winding direct current of excitation, and motor rotation is under the frequency of three-phase alternating current, and this moment, motor speed was called the nature synchronous speed; When excitation controller control inversion unit output negative-phase sequence, motor speed is called the metasynchronism rotating speed when being lower than the nature synchronous speed, and when excitation controller control inversion unit output positive phase sequence, motor speed is called supersynchronous rotating speed when being higher than the nature synchronous speed; When one timing of control winding frequency, when reducing the control winding voltage, motor nature synchronous speed reduction this moment, when improving the control winding voltage, motor nature synchronous speed raising this moment.
Utilize brushless dual-feed motor excitation controlling device over-voltage protection method of the present utility model:
When prime mover shaft band traction brushless double feed generator DFIG makes generator operation, when direct current positive and negative busbar voltage raises, the direct current positive and negative busbar will be the energy storage device charging automatically, and making DC bus-bar voltage be unlikely to raise affects inversion unit work, and the while is energy savings effectively.
Utilize brushless dual-feed motor excitation controlling device man-machine interaction method of the present utility model:
Safeguarded effectively that for ease of device the user can pass through easily setting device parameter of human-computer interaction interface, the user can pass through human-computer interaction interface observation device operational factor easily simultaneously, such as output voltage, output frequency, load current etc.Above-described embodiment is described preferred implementation of the present utility model; be not that scope of the present utility model is limited; under the prerequisite that does not break away from the utility model design spirit; various distortion and improvement that those of ordinary skills make the technical solution of the utility model all should fall in the definite protection range of the utility model claims.
Claims (10)
1. a brushless dual-feed motor excitation controlling device is characterized in that: comprise PWM rectification unit (2), current sensor (5), smoothing reactor (6), contactor (7), excitation controller and inversion unit (10), operation and display unit (11), energy storage device (12), BOOST reactor (13), soft starting circuit (14);
PWM rectification unit (2) comprises the first voltage detecting circuit (17) that connects by data-interface, the signal input part of the first voltage detecting circuit (17) is as the second three-phase input end of PWM rectification unit (2), and PWM rectification unit (2) also comprises the first three-phase input end;
Excitation controller and inversion unit (10) comprise excitation controller, inversion unit, current detection circuit (19) and second voltage testing circuit (18), be connected by data-interface between excitation controller and encoder (9), double feedback electric engine angular velocity signal and angular displacement signal that received code device (9) gathers, be connected by data-interface between excitation controller and inversion unit, excitation controller sends pwm signal to inversion unit, inversion unit just, the negative current input is just connecting, negative dc bus, the three-phase output end of inversion unit is as the first three-phase output end of excitation controller and inversion unit (10), current detection circuit (19) is connected 18 with the second voltage testing circuit) be connected with excitation controller by data-interface respectively, the signal input part of second voltage testing circuit (18) is as the first three-phase input end of excitation controller and inversion unit (10);
The first three-phase input end of PWM rectification unit (2) BOOST reactor (13) of sequentially connecting, soft starting circuit (14), the power winding (4) that connects brushless dual-feed motor behind the smoothing reactor (6), the dc output end of PWM rectification unit (2) is just passing through, the negative pole dc bus connects the direct-flow input end of excitation controller and inversion unit (10), excitation controller is connected the control winding (3) of brushless dual-feed motor with the first three-phase output end of inversion unit (10), the dc output end of PWM rectification unit (2) is just connecting, energy storage device in parallel (12) on the negative pole dc bus;
The voltage change signal of three-phase line between the power winding that the first three-phase input end of excitation controller and inversion unit (10) receives brushless dual-feed motor and first three-phase input end of PWM rectification unit, excitation controller and inversion unit (10) pass through the current changing signal of three-phase line between the first three-phase input end of the power winding of current detection circuit (19) reception brushless dual-feed motor and PWM rectification unit (2);
The voltage change signal of three-phase line between the power winding (4) of the second three-phase input end reception brushless dual-feed motor of PWM rectification unit (2) and the first three-phase input end of PWM rectification unit (2);
Be connected by communication port between excitation controller and inversion unit (10) and operation and display unit; Contactor (7) one ends are connected on the three-phase line between smoothing reactor (6) and soft starting circuit (14), a kind of being connected in the other end and electrical network, electrical load, power supply or the local power net.
2. brushless dual-feed motor excitation controlling device according to claim 1, it is characterized in that: described BOOST reactor (13) directly is connected between PWM rectification unit (2) and the soft starting circuit (14), perhaps and non-capacitive element be connected between PWM rectification unit (2) and the soft starting circuit (14).
3. brushless dual-feed motor excitation controlling device according to claim 2 is characterized in that: also comprise isolating transformer (15), be connected on the three-phase line between smoothing reactor (6) and soft starting circuit (14).
4. brushless dual-feed motor excitation controlling device according to claim 3 is characterized in that: also comprise reserve DC power supply (1), be connected in parallel on the positive and negative electrode dc bus that the dc output end of PWM rectification unit (2) connects.
5. brushless dual-feed motor excitation controlling device according to claim 4, it is characterized in that: the three-phase line that the first three-phase input end of described PWM rectification unit (2) is drawn is successively by BOOST reactor (13), soft starting circuit (14), isolating transformer (15), current sensor (5), smoothing reactor (6) links to each other with the three phase power winding (4) of brushless double feed induction generator (DFIG), and the three-phase line that the second three-phase input end of PWM rectification unit (2) is drawn directly is connected between soft starting circuit (14) and the isolating transformer (15); The positive and negative dc bus of dc output end of PWM rectification unit (2) and positive and negative input corresponding link to each other of excitation controller with inversion (10); On the positive and negative busbar between PWM rectification unit (2) and excitation controller and the inversion unit (10) and be connected with energy storage device (12);
Excitation controller links to each other with the control winding (3) of brushless double feed induction generator DFIG with the three-phase line that the first three-phase output end of inversion unit (10) is drawn, and the three-phase line that the first three-phase input end of excitation controller and inversion unit (10) is drawn directly is connected on the three-phase line between isolating transformer (15) and the current sensor (5); The output of the current sensor on the three-phase line (5) is connected with the input of current detection circuit (19);
Link to each other by the CAN serial communication between operation and display unit (11) and excitation converter and the inversion unit (10); Encoder (9) links to each other with the brushless rotor of brushless dual-feed motor; One end of contactor (7) is connected on the three-phase line between isolating transformer (15) and the current sensor (5), contactor (7) other end links to each other with electrical network or electrical load, prime mover utilizes mechanical drive mode to pass through the raising speed case to be connected with brushless double feed generator DFIG, and prime mover provides the generator operation required drive for brushless double feed generator;
Reserve DC power supply in parallel (1) on the positive and negative busbar between PWM rectification unit (2) and excitation controller and the inversion unit (10), also string has by a contactor K(1 on the output positive bus-bar of reserve DC power supply (1)) and the small-sized soft starting circuit of a resistance R (1) formation.
6. brushless dual-feed motor excitation controlling device according to claim 2, it is characterized in that: the three-phase line that the first three-phase input end of described PWM rectification unit (2) is drawn links to each other with the three phase power winding (4) of brushless double feed induction motor DFIM by BOOST reactor (13), soft starting circuit (14), isolating transformer (15), smoothing reactor (6), current sensor (5) successively, and the three-phase line that the second three-phase input end of PWM rectification unit (2) is drawn directly is connected between soft starting circuit (14) and the isolating transformer (15); The positive and negative dc bus of dc output end of PWM rectification unit (2) and positive and negative input corresponding link to each other of excitation controller with inversion (10); Energy storage device in parallel (12) on the positive and negative busbar between PWM rectification unit (2) and excitation controller and the inversion unit (10);
Excitation controller links to each other with the control winding (3) of brushless double feed induction motor DFIM with the three-phase line that the first three-phase output end of inversion unit (10) is drawn, and the three-phase line that the first three-phase input end of excitation controller and inversion unit (10) is drawn directly is connected on the three-phase line between isolating transformer (15) and the smoothing reactor (6); The output of the current sensor on the three-phase line (5) is connected with the input of current detection circuit (19);
Link to each other by the CAN serial communication between operation and display unit (11) and excitation converter and the inversion unit (10); Encoder (9) links to each other with the brushless rotor of brushless dual-feed motor; One end of contactor (7) is connected on the three-phase line between isolating transformer (15) and the smoothing reactor (6), contactor (7) other end links to each other with electrical network or power supply, brushless double feed induction motor (DFIM) is connected with line load by mechanical drive mode, for line load provides power.
7. according to claim 1 to 6 arbitrary described brushless dual-feed motor excitation controlling devices, it is characterized in that: described energy storage device (12), can be one or more in the battery pack of being furnished with the DC/DC conversion, super capacitor, high-energy capacitor, electrochemical capacitor, lead acid accumulator, nickel-cadmium cell, Ni-MH battery, flow battery, sodium-sulphur battery, the lithium ion battery, annexation be a kind of in series, parallel, the series-parallel connection.
8. according to claim 1 to 6 arbitrary described brushless dual-feed motor excitation controlling devices, it is characterized in that: described soft starting circuit (14) adopts a kind of in three-phase soft start and two kinds of connected modes of two-phase soft start,
The three-phase soft starting circuit is made of resistance R 2, resistance R 3, resistance R 4 and three contact contactor K2, resistance R 2, resistance R 3, resistance R 4 are connected on respectively on three three-phase AC lines, and three contacts of K2 contactor are in parallel with resistance R 2, resistance R 3, resistance R 4 respectively;
The two-phase soft starting circuit is made of two resistance R 5, resistance R 6 and a double-contact contactor K3, and resistance R 5, resistance R 6 are connected on any two of the three-phase AC line, and two contacts of double-contact contactor K3 are in parallel with resistance R 5, resistance R 6 respectively.
9. according to claim 3 to 6 arbitrary described brushless dual-feed motor excitation controlling devices, it is characterized in that: the connected mode of described isolating transformer (15) is:
Primary side is Angle connection, and secondary side is Y-connection;
Or primary side is Angle connection, and secondary side is Angle connection;
Or primary side is Y-connection, and secondary side is Angle connection;
Or primary side is Y-connection, and secondary side is Y-connection.
10. according to claim 1 to 6 arbitrary described brushless dual-feed motor excitation controlling devices, it is characterized in that: described current sensor (5) adopts Hall current sensor, adopt two current sensors (5) to any two-phase circuit difference collection signal in the three-phase line, or adopt three current sensors (5) to the difference of the three-phase line in three-phase line collection signal.
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| CN2012205401739U CN202889279U (en) | 2012-10-19 | 2012-10-19 | Brushless doubly fed motor excitation control device |
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| CN103326650A (en) * | 2013-05-15 | 2013-09-25 | 华中科技大学 | Self-shunt excitation system of electric generator |
| CN104993758A (en) * | 2015-07-31 | 2015-10-21 | 华中科技大学 | Brushless doubly-fed shaft-driven power generation system short-time overload control apparatus and control method |
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| US9859752B2 (en) | 2015-06-05 | 2018-01-02 | General Electric Company | Uninterruptible power supply and method of use |
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| CN103326650A (en) * | 2013-05-15 | 2013-09-25 | 华中科技大学 | Self-shunt excitation system of electric generator |
| CN103326650B (en) * | 2013-05-15 | 2015-12-09 | 华中科技大学 | A kind of self-shunt excitation system of generator |
| US9882424B2 (en) | 2014-02-21 | 2018-01-30 | General Electric Company | Redundant uninterruptible power supply systems |
| US9685820B2 (en) | 2014-03-11 | 2017-06-20 | General Electric Company | Redundant uninterruptible power supply systems |
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| US9859716B2 (en) | 2015-05-29 | 2018-01-02 | General Electric Company | Hybrid AC and DC distribution system and method of use |
| US9859752B2 (en) | 2015-06-05 | 2018-01-02 | General Electric Company | Uninterruptible power supply and method of use |
| CN104993758B (en) * | 2015-07-31 | 2018-02-23 | 华中科技大学 | A kind of brushless double fed shaft electricity generation system short-time overload control device and control method |
| CN104993758A (en) * | 2015-07-31 | 2015-10-21 | 华中科技大学 | Brushless doubly-fed shaft-driven power generation system short-time overload control apparatus and control method |
| CN108110799A (en) * | 2018-01-30 | 2018-06-01 | 国家电网公司 | The grid-connected virtual synchronous control method and device of isolated island double-fed fan motor field high voltage direct current |
| CN108110799B (en) * | 2018-01-30 | 2020-06-30 | 国家电网公司 | Virtual synchronous control method and device for high-voltage direct current grid connection of island double-fed wind power plant |
| CN113162495A (en) * | 2021-05-14 | 2021-07-23 | 济南安瑞信源机电设备有限公司 | Anti-interference circuit and anti-interference method for excitation forced excitation of generator |
| CN114123893A (en) * | 2021-11-16 | 2022-03-01 | 南京航空航天大学 | Current balance control method and system for automotive double-winding steering motor |
| CN114123893B (en) * | 2021-11-16 | 2023-10-27 | 南京航空航天大学 | Current balance control method and system for vehicular double-winding steering motor |
| CN115219737A (en) * | 2022-06-20 | 2022-10-21 | 成都飞机工业（集团）有限责任公司 | Calibration device and method for rotating speed dial indicator by taking single-phase function generator as source |
| CN115219737B (en) * | 2022-06-20 | 2023-09-29 | 成都飞机工业（集团）有限责任公司 | Device and method for calibrating rotation speed dial indicator by taking single-phase function generator as source |
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