CN103647499A - All-quadrant frequency conversion speed regulation system and method for composite-rotor brushless doubly-fed alternating current motor - Google Patents
All-quadrant frequency conversion speed regulation system and method for composite-rotor brushless doubly-fed alternating current motor Download PDFInfo
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Abstract
The invention provides an all-quadrant frequency conversion speed regulation system for a composite-rotor brushless doubly-fed alternating current motor. The system comprises a motor-side pulse width modulation (PWM) converter, a main loop direct current link, a network-side PWM converter, an analog/digital (AD) converter and a programmable processor. A control winding of the motor, the motor-side PWM converter, the main loop direct current link and the network-side PWM converter are sequentially connected with one another; the network-side PWM converter is connected with an alternating current power grid; the AD converter is connected with the programmable processor, the motor-side PWM converter, the main loop direct current link, the network-side PWM converter and the alternating current power grid respectively; the motor-side PWM converter and the network-side PWM converter are respectively connected with the programmable processor. The invention also provides an all-quadrant intelligent speed regulation control method. The system and the method have the beneficial effects that a starting process is simplified through man-machine interaction, the harmonic interference of the speed regulation system to the power grid is reduced, the energy consumption in the starting process is reduced, the speed lower than synchronous speed can be regulated, and the speed exceeding the synchronous speed also can be regulated.
Description
Technical field
The present invention relates to ac motor speed control control technology and method, particularly relate to the panoramic limit frequency conversion speed-adjusting system of a kind of composite-rotor brushless double-fed alternating current motor and method.
Background technology
The governing system of existing large power winding formula (double-fed) alternating current machine all adopts tandem control method to realize the adjusting to motor speed, and speed adjustable range is limited in synchronous speed with interior (being less than synchronous speed); The structure of large power winding formula (double-fed) Speed Adjustment of AC Motor adopts the orthogonal form of handing over more; Major loop one end of system is connected with rotor winding, by diode or thyristor rectifier, AC energy in motor winding is converted to direct current energy, then energy feedback AC network, realizes speed governing by the inverter (adopting thyristor to form) being connected with net side more.
Speed regulating control technology can be saved a large amount of electric energy, so market is very vigorous to the demand of the moderate mesohigh governing system of function admirable, cost.But there is following shortcoming in existing governing system:
1. speed adjustable range is less than synchronous speed, can not realize supersynchronous operation;
2. governing system power factor is low, the harmonic wave serious interference to electrical network;
3. heavy-duty motor start-up course adopts crosstalk resistance or water resistance to start more, and start-up course energy consumption is larger, and unsuitable frequent start-stop.
Summary of the invention
The object of the invention is to overcome above-mentioned defect, provide a kind of composite-rotor brushless double-fed alternating current motor panoramic limit frequency conversion speed-adjusting system, AC energy in Electric Machine Control winding can be converted to direct current energy, again energy feedback AC network, realization is lower than the speed governing of synchronous speed, also power grid energy can be injected to motor, realize the speed governing of supersynchronous rotating speed.By man-machine interaction, set, change control device parameter, the startup of operating system, stop and resetting, simplify start-up course, easy to use, reduce the humorous wave interference of governing system to electrical network, reduction start-up course energy consumption, controls speed regulation process effectively.
The invention provides the panoramic limit frequency conversion speed-adjusting system of a kind of composite-rotor brushless double-fed alternating current motor, comprise the composite-rotor brushless double-fed alternating current motor being connected with AC network and the mechanical load being connected with its rotating shaft, also comprise motor side pwm converter, major loop DC link, net side pwm converter, AD converter and programmable processor, the control winding of described composite-rotor brushless double-fed alternating current motor, motor side pwm converter, major loop DC link is connected successively with net side pwm converter, described net side pwm converter is connected with described AC network, described AD converter and described programmable processor, motor side pwm converter, major loop DC link, net side pwm converter is connected respectively with AC network, described motor side pwm converter is connected with described programmable processor respectively with net side pwm converter, described programmable processor is carried out the following step of controlling:
By described AD converter, detect operating voltage and electric current and the DC voltage of Electric Machine Control winding, net side, judgement is when the operating state of front motor; Calculate power output, the power factor of motor, by described motor side pwm converter, control operating voltage, electric current and the frequency of Electric Machine Control winding, regulate power output, power factor and the rotating speed of motor, control motor and owe synchronous speed and the operation of supersynchronous rotating speed; By described net side pwm converter, control net side operating current, when DC voltage is on the low side, from described electrical network, absorbs energy or reduce to described electrical network output energy to improve DC voltage; When DC voltage is higher, to described electrical network output energy or increase, to described electrical network, export energy to reduce DC voltage, control the stable operation of DC voltage four-quadrant.
The panoramic limit frequency conversion speed-adjusting system of composite-rotor brushless double-fed alternating current motor of the present invention, also comprise monitoring touch-screen, described monitoring touch-screen is connected with described programmable processor, between described programmable processor and described monitoring touch-screen and AD converter, is respectively equipped with RS485 PORT COM.
The panoramic limit frequency conversion speed-adjusting system of composite-rotor brushless double-fed alternating current motor of the present invention, wherein said motor side pwm converter and net side pwm converter adopt full-controlled switch device IGBT to form.
The panoramic limit frequency conversion speed-adjusting system of composite-rotor brushless double-fed alternating current motor of the present invention, wherein said programmable processor is replaced and is adopted single-chip microcomputer or dsp processor.
The present invention also provides a kind of composite-rotor brushless double-fed alternating current motor method that panoramic limit intelligent speed-regulating is controlled, the method arranges motor side pwm converter, major loop DC link, net side pwm converter, AD converter, programmable processor and monitoring touch-screen, and the method is carried out the following step of controlling:
1) described programmable processor starts initialize routine controller is carried out to initialization, and system is in preparation state;
2) by described monitoring touch-screen, realize man-machine interaction, carry out the setting of operational mode and rotating speed, control parameter modification and to the operation of system start, stop, the operation of automatic tracing;
3) described programmable processor detects operating voltage and electric current and the DC voltage of Electric Machine Control winding, net side by described AD converter, and judgement is when the operating state of front motor;
4) described programmable processor calculates power output, the power factor of motor, by described motor side pwm converter, control operating voltage, electric current and the frequency of Electric Machine Control winding, regulate power output, power factor and the rotating speed of motor, control motor and owe synchronous speed and the operation of supersynchronous rotating speed.
5) described net side pwm converter is controlled net side operating current, when DC voltage is on the low side, from described electrical network, absorbs energy or reduces to described electrical network output energy to improve DC voltage; When DC voltage is higher, to described electrical network output energy or increase, to described electrical network, export energy to reduce DC voltage, control the stable operation of DC voltage four-quadrant.
The method that the panoramic limit intelligent speed-regulating of composite-rotor brushless double-fed alternating current motor of the present invention is controlled, the control algolithm that wherein said programmable processor is controlled the stable operation of DC voltage four-quadrant comprises:
A) composite-rotor brushless double-fed motor mathematical model, comprises voltage equation, electromagnetic torque equation and mechanical movement equation, wherein:
In d-q axle rotor speed coordinate system, the voltage equation of composite-rotor brushless double-fed motor is:
Wherein: r
p, L
sp, M
pfor power is controlled the mutual inductance of resistance, self-induction and power winding and the rotor of winding; r
c, L
sc, M
cfor controlling the mutual inductance of resistance, self-induction and control winding and the rotor of winding; r
r, L
r, ω
rmechanical angle speed for rotor resistance, self-induction and motor; u
qp, u
dp, u
qc, u
dc, u
qr, u
dr, i
qp, i
dp, i
qc, i
dc, i
qr, i
drthe instantaneous value that all represents electric current and voltage; Subscript p, c, s, r represent respectively power winding, control winding, stator side, rotor-side; D, q represent the component under d-q coordinate system; P is differential operator;
Electromagnetic torque equation is:
T
e=T
ep+T
ec=p
pM
pr(i
qpi
dr-i
dpi
qr)
(4.2)
+p
cM
cr(i
qci
dr+i
dci
qr)
Mechanical movement equation is:
pω
r=1/J(T
e-T
l-K
dω
r) (4.3)
Wherein: J, K
dfor rotor mechanical inertia, rotary damping coefficient; T
e, T
ep, T
ec, T
lbe respectively the torque of total torque, the generation of power winding, torque and the load torque that control winding produces;
B) composite-rotor brushless double-fed motor steady operation rotating speed is:
Wherein: n
rfor motor speed, f
pfor composite-rotor brushless double-fed alternating current motor net side winding current operating frequency, f
cfor controlling winding operating current frequency, while owing synchronous speed, f
cbefore get "-" number; During supersynchronous speed, get "+" number; By change, control winding voltage, regulate smoothly the rotating speed of motor, realize variable frequency regulating speed control.
6) method that the panoramic limit intelligent speed-regulating of composite-rotor brushless double-fed alternating current motor of the present invention is controlled, wherein said programmable processor is stored and is inquired about the parameter variation tendency in running, error message, warning, energy output data, floor data and historical data, and realizes Distant supervision and control by fieldbus.
The beneficial effect of the panoramic limit frequency conversion speed-adjusting system of composite-rotor brushless double-fed alternating current motor of the present invention and method is: owing to being provided with motor side pwm converter, net side pwm converter and programmable processor, by man-machine interaction, set, change control device parameter, the startup of operating system, stop and resetting, simplify start-up course, easy to use, reduce the humorous wave interference of governing system to electrical network, reduce start-up course energy consumption, effectively control speed regulation process, AC energy in Electric Machine Control winding can be converted to direct current energy, again energy feedback AC network, realization is lower than the speed governing of synchronous speed, also power grid energy can be injected to motor, realize the speed governing of supersynchronous rotating speed.
Further, by the parameter variation tendency in running, error message, warning, energy output data, floor data and historical data, stored and inquired about, system also can realize Distant supervision and control by fieldbus.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the panoramic limit frequency conversion speed-adjusting system of composite-rotor brushless double-fed alternating current motor of the present invention.
Embodiment
For further setting forth the present invention, below in conjunction with embodiment, the panoramic limit frequency conversion speed-adjusting system of composite-rotor brushless double-fed alternating current motor of the present invention is done to more detailed description.
As shown in Figure 1, the panoramic limit frequency conversion speed-adjusting system of composite-rotor brushless double-fed alternating current motor of the present invention, comprises the composite-rotor brushless double-fed alternating current motor 4 being connected with AC network and the mechanical load 9 being connected with its rotating shaft, motor side pwm converter 3, major loop DC link 1, net side pwm converter 2, AD converter 8, monitoring touch-screen 6 and programmable processor 5.Motor side pwm converter 3 and net side pwm converter 2 adopt full-controlled switch device IGBT to form.Programmable processor 5 also can be replaced the processor that adopts single-chip microcomputer, DSP etc. to have powerful disposal ability.
Wherein, the control winding of composite-rotor brushless double-fed alternating current motor 4, motor side pwm converter 3, major loop DC link 1 and net side pwm converter 2 are connected successively, net side pwm converter 2 is connected with AC network, AD converter 8 is connected respectively with AC network with programmable processor 5, motor side pwm converter 3, major loop DC link 1, net side pwm converter 2, motor side pwm converter 3 is connected with programmable processor 5 respectively with net side pwm converter 2, and monitoring touch-screen 6 is connected with programmable processor 5.
The operating voltage and electric current and the DC voltage that by AD converter 8, detect Electric Machine Control winding, net side, judgement is when the operating state of front motor; Calculate power output, the power factor of motor, by motor side pwm converter 3, control operating voltage, electric current and the frequency of Electric Machine Control winding, regulate power output, power factor and the rotating speed of motor, control motor and owe synchronous speed and the operation of supersynchronous rotating speed; By net side pwm converter 2, control net side operating current, when DC voltage is on the low side, from electrical network, absorbs energy or reduce to electrical network output energy to improve DC voltage; When DC voltage is higher, to electrical network output energy or increase, to electrical network, export energy to reduce DC voltage, control the stable operation of DC voltage four-quadrant.
The panoramic limit frequency conversion speed-adjusting system of composite-rotor brushless double-fed alternating current motor of the present invention adopts 485 communications to be connected and to realize man-machine interaction with monitoring touch-screen, between programmable processor 5 and monitoring touch-screen 6 and AD converter 8, is respectively equipped with RS485 PORT COM 7.
The panoramic limit frequency conversion speed-adjusting system of composite-rotor brushless double-fed alternating current motor of the present invention, can realize Distant supervision and control by fieldbus.
The method that the panoramic limit intelligent speed-regulating of a kind of composite-rotor brushless double-fed alternating current motor of the present invention is controlled, the method arranges motor side pwm converter 3, major loop DC link 1, net side pwm converter 2, AD converter 8, programmable processor 5 and monitoring touch-screen 6, and the method is carried out the following step of controlling:
1) programmable processor 5 starts initialize routine controller is carried out to initialization, and system is in preparation state;
2) by monitoring touch-screen 6, realize man-machine interaction, carry out the setting of operational mode and rotating speed, control parameter modification and to the operation of system start, stop, the operation of automatic tracing;
3) programmable processor 5 detects operating voltage and electric current and the DC voltage of Electric Machine Control winding, net side by AD converter 8, and judgement is when the operating state of front motor;
4) programmable processor 5 calculates power output, the power factor of motor, by motor side pwm converter 3, control operating voltage, electric current and the frequency of Electric Machine Control winding, regulate power output, power factor and the rotating speed of motor, control motor and owe synchronous speed and the operation of supersynchronous rotating speed.
5) net side pwm converter 2 is controlled net side operating current, when DC voltage is on the low side, from electrical network, absorbs energy or reduces to electrical network output energy to improve DC voltage; When DC voltage is higher, to electrical network output energy or increase, to electrical network, export energy to reduce DC voltage, control the stable operation of DC voltage four-quadrant.
6) control algolithm of described programmable processor control DC voltage four-quadrant stable operation comprises:
A) composite-rotor brushless double-fed motor speed Mathematical Modeling, comprises voltage equation, electromagnetic torque equation and mechanical movement equation, wherein:
In d-q axle rotor speed coordinate system, the voltage equation of composite-rotor brushless double-fed motor is:
Wherein: r
p, L
sp, M
pfor power is controlled the mutual inductance of resistance, self-induction and power winding and the rotor of winding; r
c, L
sc, M
cfor controlling the mutual inductance of resistance, self-induction and control winding and the rotor of winding; r
r, L
r, ω
rmechanical angle speed for rotor resistance, self-induction and motor; u
qp, u
dp, u
qc, u
dc, u
qr, u
dr, i
qp, i
dp, i
qc, i
dc, i
qr, i
drthe instantaneous value that all represents electric current and voltage; Subscript p, c, s, r represent respectively power winding, control winding, stator side, rotor-side; D, q represent the component under d-q coordinate system; P is differential operator;
Electromagnetic torque equation is:
T
e=T
ep+T
ec=p
pM
pr(i
qpi
dr-i
dpi
qr)
(4.2)
+p
cM
cr(i
qci
dr+i
dci
qr)
Mechanical movement equation is:
pω
r=1/J(T
e-T
l-K
dω
r) (4.3)
Wherein: J, K
dfor rotor mechanical inertia, rotary damping coefficient; T
e, T
ep, T
ec, T
lbe respectively the torque of total torque, the generation of power winding, torque and the load torque that control winding produces;
B) composite-rotor brushless double-fed motor steady operation rotating speed is:
Wherein: n
rfor motor speed, f
pfor composite-rotor brushless double-fed alternating current motor net side winding (stator winding) current work frequency, f
cfor controlling winding operating current frequency, while owing synchronous speed, f
cbefore get "-" number; During supersynchronous speed, get "+" number.
From formula (4-4), because brushless double-fed acc power winding is directly connected with electrical network, so f
pfor definite value, if changed equably, control winding frequency f
c, just can regulate smoothly the rotating speed of motor, realize frequency control, thereby make governing system there is good mechanical property.Because power winding is directly connected with electrical network, power winding voltage is almost constant, can only change control winding voltage.The voltage supplied frequency ratio of controlling winding is constant, and maintaining air-gap flux is rated value.By change, control winding voltage, regulate smoothly the rotating speed of motor, realize variable frequency regulating speed control.
7) parameter variation tendency, error message, warning, energy output data, floor data and the historical data in 5 pairs of runnings of programmable processor stored and inquired about, and realizes Distant supervision and control by fieldbus.
Above embodiment is described the preferred embodiment of the present invention; not scope of the present invention is limited; design under the prerequisite of spirit not departing from the present invention; various distortion and improvement that the common engineers and technicians in this area make technical scheme of the present invention, all should fall in the definite protection range of claims of the present invention.
Claims (7)
1. the panoramic limit frequency conversion speed-adjusting system of composite-rotor brushless double-fed alternating current motor, comprise the composite-rotor brushless double-fed alternating current motor (4) being connected with AC network and the mechanical load (9) being connected with its rotating shaft, it is characterized in that, also comprise motor side pwm converter (3), major loop DC link (1), net side pwm converter (2), AD converter (8) and programmable processor (5)
The control winding of described composite-rotor brushless double-fed alternating current motor (4), motor side pwm converter (3), major loop DC link (1) is connected successively with net side pwm converter (2), described net side pwm converter (2) is connected with described AC network, described AD converter (8) and described programmable processor (5), motor side pwm converter (3), major loop DC link (1), net side pwm converter (2) is connected respectively with AC network, described motor side pwm converter (3) is connected with described programmable processor (5) respectively with net side pwm converter (2), described programmable processor (5) is carried out the following step of controlling:
By described AD converter (8), detect operating voltage and electric current and the DC voltage of Electric Machine Control winding, net side, judgement is when the operating state of front motor; Calculate power output, the power factor of motor, by described motor side pwm converter (3), control operating voltage, electric current and the frequency of Electric Machine Control winding, regulate power output, power factor and the rotating speed of motor, control motor and owe synchronous speed and the operation of supersynchronous rotating speed; By described net side pwm converter (2), control net side operating current, when DC voltage is on the low side, from described electrical network, absorbs energy or reduce to described electrical network output energy to improve DC voltage; When DC voltage is higher, to described electrical network output energy or increase, to described electrical network, export energy to reduce DC voltage, control the stable operation of DC voltage four-quadrant.
2. the panoramic limit frequency conversion speed-adjusting system of composite-rotor brushless double-fed alternating current motor according to claim 1, it is characterized in that: also comprise monitoring touch-screen (6), described monitoring touch-screen (6) is connected with described programmable processor (5), between described programmable processor (5) and described monitoring touch-screen (6) and AD converter (8), is respectively equipped with RS485 PORT COM (7).
3. the panoramic limit frequency conversion speed-adjusting system of composite-rotor brushless double-fed alternating current motor according to claim 1 and 2, is characterized in that, wherein said motor side pwm converter (3) and net side pwm converter (2) adopt full-controlled switch device IGBT to form.
4. the panoramic limit frequency conversion speed-adjusting system of composite-rotor brushless double-fed alternating current motor according to claim 3, is characterized in that, wherein said programmable processor (5) is replaced and adopted single-chip microcomputer or dsp processor.
5. the method that the panoramic limit intelligent speed-regulating of a composite-rotor brushless double-fed alternating current motor is controlled, the method arranges motor side pwm converter (3), major loop DC link (1), net side pwm converter (2), AD converter (8), programmable processor (5) and monitoring touch-screen (6), it is characterized in that, the method is carried out the following step of controlling:
1) described programmable processor (5) starts initialize routine controller is carried out to initialization, and system is in preparation state;
2) by described monitoring touch-screen (6), realize man-machine interaction, carry out the setting of operational mode and rotating speed, control parameter modification and to the operation of system start, stop, the operation of automatic tracing;
3) described programmable processor (5) detects operating voltage and electric current and the DC voltage of Electric Machine Control winding, net side by described AD converter (8), and judgement is when the operating state of front motor;
4) described programmable processor (5) calculates power output, the power factor of motor, by described motor side pwm converter (3), control operating voltage, electric current and the frequency of Electric Machine Control winding, regulate power output, power factor and the rotating speed of motor, control motor and owe synchronous speed and the operation of supersynchronous rotating speed.
5) described net side pwm converter (2) is controlled net side operating current, when DC voltage is on the low side, from described electrical network, absorbs energy or reduces to described electrical network output energy to improve DC voltage; When DC voltage is higher, to described electrical network output energy or increase, to described electrical network, export energy to reduce DC voltage, control the stable operation of DC voltage four-quadrant.
6. the method that the panoramic limit intelligent speed-regulating of composite-rotor brushless double-fed alternating current motor according to claim 5 is controlled, is characterized in that, the control algolithm that wherein said programmable processor (5) is controlled the stable operation of DC voltage four-quadrant comprises:
1) composite-rotor brushless double-fed motor mathematical model, comprises voltage equation, electromagnetic torque equation and mechanical movement equation, wherein:
In d-q axle rotor speed coordinate system, the voltage equation of composite-rotor brushless double-fed motor is:
Wherein: r
p, L
sp, M
pfor power is controlled the mutual inductance of resistance, self-induction and power winding and the rotor of winding; r
c, L
sc, M
cfor controlling the mutual inductance of resistance, self-induction and control winding and the rotor of winding; r
r, L
r, ω
rmechanical angle speed for rotor resistance, self-induction and motor; u
qp, u
dp, u
qc, u
dc, u
qr, u
dr, i
qp, i
dp, i
qc, i
dc, i
qr, i
drthe instantaneous value that all represents electric current and voltage; Subscript p, c, s, r represent respectively power winding, control winding, stator side, rotor-side; D, q represent the component under d-q coordinate system; P is differential operator;
Electromagnetic torque equation is:
T
e=T
ep+T
ec=p
pM
pr(i
qpi
dr-i
dpi
qr)
(4.2)
+p
cM
cr(i
qci
dr+i
dci
qr)
Mechanical movement equation is:
pω
r=1/J(T
e-T
l-K
dω
r) (4.3)
Wherein: J, K
dfor rotor mechanical inertia, rotary damping coefficient; T
e, T
ep, T
ec, T
lbe respectively the torque of total torque, the generation of power winding, torque and the load torque that control winding produces;
2) composite-rotor brushless double-fed motor steady operation rotating speed is:
Wherein: n
rfor motor speed, f
pfor composite-rotor brushless double-fed alternating current motor net side winding current operating frequency, f
cfor controlling winding operating current frequency, while owing synchronous speed, f
cbefore get "-" number; During supersynchronous speed, get "+" number; By change, control winding voltage, regulate smoothly the rotating speed of motor, realize variable frequency regulating speed control.
7. the method for controlling according to the panoramic limit intelligent speed-regulating of the composite-rotor brushless double-fed alternating current motor described in claim 5 or 6, it is characterized in that, wherein said programmable processor (5) is stored and is inquired about the parameter variation tendency in running, error message, warning, energy output data, floor data and historical data, and realizes Distant supervision and control by fieldbus.
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|---|---|---|---|
| CN201310741030.3A CN103647499A (en) | 2013-12-27 | 2013-12-27 | All-quadrant frequency conversion speed regulation system and method for composite-rotor brushless doubly-fed alternating current motor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310741030.3A CN103647499A (en) | 2013-12-27 | 2013-12-27 | All-quadrant frequency conversion speed regulation system and method for composite-rotor brushless doubly-fed alternating current motor |
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| CN103647499A true CN103647499A (en) | 2014-03-19 |
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| CN201310741030.3A Pending CN103647499A (en) | 2013-12-27 | 2013-12-27 | All-quadrant frequency conversion speed regulation system and method for composite-rotor brushless doubly-fed alternating current motor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104113265A (en) * | 2014-08-06 | 2014-10-22 | 广东上水能源科技有限公司 | Redundancy four-quadrant brushless double-fed motor speed regulation system allowing smooth handoff |
| CN109444745A (en) * | 2018-12-26 | 2019-03-08 | 河北工业大学 | A kind of squirrel cage asynchronous motor mechanical back to back test platform based on double PWM converter four quadrant runnings |
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| CN1881767A (en) * | 2006-03-08 | 2006-12-20 | 合肥阳光电源有限公司 | Control structure of full power type AC-DC-AC converter for wind power generation |
| CN102801384A (en) * | 2012-08-21 | 2012-11-28 | 北京信息科技大学 | Induction machine frequency control system based on DSP (Digital Signal Processor) |
| CN203747716U (en) * | 2013-12-27 | 2014-07-30 | 广东上水能源科技有限公司 | Composite-rotor brushless doubly-fed alternating-current motor all-quadrant variable-frequency speed regulation system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104113265A (en) * | 2014-08-06 | 2014-10-22 | 广东上水能源科技有限公司 | Redundancy four-quadrant brushless double-fed motor speed regulation system allowing smooth handoff |
| CN109444745A (en) * | 2018-12-26 | 2019-03-08 | 河北工业大学 | A kind of squirrel cage asynchronous motor mechanical back to back test platform based on double PWM converter four quadrant runnings |
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