CN103138674A - High-power brushless double fed motor variable frequency speed regulation system and control method - Google Patents

High-power brushless double fed motor variable frequency speed regulation system and control method Download PDF

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CN103138674A
CN103138674A CN2013101050323A CN201310105032A CN103138674A CN 103138674 A CN103138674 A CN 103138674A CN 2013101050323 A CN2013101050323 A CN 2013101050323A CN 201310105032 A CN201310105032 A CN 201310105032A CN 103138674 A CN103138674 A CN 103138674A
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unit
phase
power
voltage
brushless double
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CN103138674B (en
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刘宏鑫
向守兵
马文武
谭应朝
杜战波
赵雅茹
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BEIJING SWORD ELECTRIC INDUSTRIAL Co Ltd
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BEIJING SWORD ELECTRIC INDUSTRIAL Co Ltd
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Abstract

A high-power brushless double fed motor variable frequency speed regulation system comprises a power winding of the high-power brushless double fed motor and a control winding, a first contactor, an input power distribution unit, an entry switch, a soft start circuit, a alternating current or direct current rectifying unit, a energy-storage capacitor, an operation and display unit, and an excitation control and inverter module which is composed of a excitation controller, an inverter unit, a first current detection unit, a second current detection unit and a voltage detection unit. After the power winding is connected with the first contactor in series, the power winding is connected with the input power distribution unit, the entry switch, the alternating current or direct current rectifying unit, the energy-storage capacitor, and the inverter module, then the power winding is connected with the control winding. The soft start circuit is connected with a circuit between the alternating current or direct current rectifying unit and a three-phase output end of the entry switch in series or the soft start circuit is connected with a circuit between the alternating current or direct current rectifying unit and the energy-storage capacitor. Whole course frequency speed regulation of the brushless double fed motor can be achieved. The invention further comprises a fundamental control timing sequence and a method.

Description

High-power brushless double-fed motor variable frequency speed control system and control method
Technical field
The present invention relates to a kind of control system and control method, particularly relate to a kind of control system for high-power brushless double-fed motor and control method.
Background technology
At present, the research of brushless dual-feed motor design and control system thereof is carried out decades, but because the brushless double-fed motor system model is complicated, there is no ready-made control algolithm and control system, particularly for powerful brushless double-fed motor, the high voltage converter cost that adopts is high, volume is large, rated capacity is large, and energy consumption is serious, the control system complex structure, the Operation and Maintenance difficulty, do not control efficiently sequential and method, these problems have all seriously hindered applying of it, so also there is no so far the report of industrialization in the whole world.
Summary of the invention
The purpose of this invention is to provide a kind of high-power brushless double-fed motor variable frequency speed control system, solve the small-power excitation controller and control the technical problem that the high-power brushless double-fed motor can't be realized full distance speed regulating.
Another object of the present invention is to provide a kind of method of utilizing above-mentioned frequency conversion speed-adjusting system to carry out high-power brushless double-fed motor control, realizes the full distance speed regulating to high-power brushless double-fed motor.
High-power brushless double-fed motor variable frequency speed control system of the present invention, comprise the power winding of high-power brushless double-fed motor and control winding, wherein: also comprise the first contactor, input power power supply unit, input switch, soft starting circuit, alternating current-direct current rectification unit, storage capacitor, operation and display unit, and controlled and inversion module by the excitation that excitation controller, inversion unit, the first current detecting unit, the second current detecting unit, voltage detection unit form
a three-phase output end that connects described input power power supply unit after three-phase incoming line series connection first contactor of described power winding, another three-phase output end of described input power power supply unit connects the three-phase input end of described input switch by three-phase line, the three-phase output end of described input switch connects the three-phase input end of described alternating current-direct current rectification unit by three-phase line, the positive and negative dc bus of described alternating current-direct current rectification unit output is sequentially connected after described storage capacitor, the positive and negative direct-flow input end that connects described inversion unit, the three-phase output end of described inversion unit connects described control winding by three-phase line, described soft starting circuit is connected on circuit between the three-phase output end of described alternating current-direct current rectification unit and described input switch, or be connected on circuit between described alternating current-direct current rectification unit and storage capacitor, carrying out data by serial communication mode between described operation and demonstration and described excitation controller is connected,
Described excitation controller gathers the curent change of three-phase line between described power winding and the first contactor by described the first current detecting unit, control the curent change of three-phase line between winding and described inversion unit by described the second current detecting unit collection, gather the change in voltage of three-phase line between described input switch and described input power power supply unit by described voltage detection unit, and generate the control signal of controlling described the first contactor and generate the pwm signal of controlling described inversion unit output.
Described alternating current-direct current rectification unit is the full-bridge rectification unit, also comprise brake unit and brake resistance, described soft starting circuit is connected on dc bus between full-bridge rectification unit output and described storage capacitor, described brake unit in parallel on positive and negative dc bus between described soft starting circuit and described storage capacitor, described brake unit described brake resistance in parallel.
Described alternating current-direct current rectification unit is the PWM rectification unit, also comprises the BOOST reactor, connect described soft starting circuit and described BOOST reactor of order on the circuit between the three-phase output end of described input switch and PWM rectification unit.
Described input power power supply unit is the low voltage electric network power supply unit.
Described input power power supply unit comprises high-voltage fence power supply unit and low voltage electric network power supply unit, also comprise transformer, described first contactor of three-phase output end series connection of described high-voltage fence power supply unit, another three-phase output end of described high-voltage fence power supply unit is connected with the primary side of described transformer, the secondary side of described transformer connects the power input of described low voltage electric network power supply unit, and the three-phase output end of described low voltage electric network power supply unit connects the three-phase input end of input switch by three-phase line.
Described BOOST reactor directly is connected between PWM rectification unit and soft starting circuit, perhaps and non-capacitive element be connected between PWM rectification unit and soft starting circuit.
Adopt three-phase soft start or two-phase soft start syndeton when described soft starting circuit is used for three-phase line, adopt two-phase soft start or single-phase soft start syndeton when described soft starting circuit is used for positive and negative DC line.
Described PWM rectification unit and described inversion unit are used for break-make modulation power semiconductor device can adopt a kind of of silicon controlled rectifier, gate electrode capable of switching off device, power transistor, MOSFET, igbt, integrated gate commutated thyristor, SGCT.
The control method of utilizing above-mentioned high-power brushless double-fed motor variable frequency speed control system to carry out frequency control is characterized in that comprising the following steps:
S100, closed input switch, soft starting circuit work, system judges whether the voltage on storage capacitor reaches operating point.
After if the voltage on the s110 storage capacitor does not reach operating point, soft starting circuit discharges, and demonstration that system is under-voltage is shut down, and re-starts judgement;
After if the voltage on the s120 storage capacitor reaches operating point, soft starting circuit is closed;
S200, voltage detection unit detect change in voltage on three-phase line between low voltage electric network power supply unit and input switch by the voltage signal acquisition end, send image data to excitation controller, excitation controller carries out phase-locked processing to its frequency and phase place;
S300, excitation controller is carried out the operations such as control command, frequency, sampling by I/O interface or remote communication interface or operation and display unit; After receiving action command, excitation controller sends the output voltage of same frequency and antiphase according to frequency and the phase place of electrical network from the pwm signal output;
S400, the time-delay a period of time after, closed the first contactor, high-power brushless double-fed motor is in the zero-speed running status;
After s500, end time-delay, excitation controller is according to the frequency of setting and Acceleration and deceleration time operation; Detect the curent change of the different windings of brushless double-fed motor by the first current detecting unit and the second current detecting unit; And control by operation and display unit or general purpose I/O interface or remote communication interface;
S600, after excitation controller receives halt command, according to deceleration time, first decelerate to zero-speed, then the control input end by the first contactor controls and disconnects the first contactor, then through closing excitation output after time-delay.
The control method of utilizing above-mentioned high-power brushless double-fed motor variable frequency speed control system to carry out frequency control is characterized in that comprising the following steps:
S10, closed input switch, soft starting circuit work, system judges whether the voltage on storage capacitor reaches operating point;
After if the voltage on the s11 storage capacitor does not reach operating point, soft starting circuit discharges, and demonstration that system is under-voltage is shut down, and re-starts judgement;
After if the voltage on the s12 storage capacitor reaches operating point, soft starting circuit is closed;
S20, voltage detection unit detect change in voltage on three-phase line between low voltage electric network power supply unit and input switch by the voltage signal acquisition end, send image data to excitation controller, excitation controller carries out phase-locked processing to its frequency and phase place, and the PWM rectification unit is started working;
S30, excitation controller is carried out the operations such as control command, frequency, sampling by I/O interface or remote communication interface or operation and display unit; After receiving action command, excitation controller sends the output voltage of same frequency and antiphase according to frequency and the phase place of electrical network from the pwm signal output;
S40, the time-delay a period of time after, closed the first contactor, motor is in the zero-speed running status;
After s50, end time-delay, excitation controller is according to the frequency of setting and Acceleration and deceleration time operation; Detect the curent change of the different windings of brushless double-fed motor by the first current detecting unit and the second current detecting unit; And control by operation and display unit or general purpose I/O interface or remote communication interface;
S60, after excitation controller receives halt command, according to deceleration time, first decelerate to zero-speed, then the control input end by the first contactor controls and disconnects the first contactor, then through closing excitation output after time-delay.
High-power brushless double-fed motor variable frequency speed control system reliability of the present invention is high, when excitation controller damages, controlling winding can automatically switch to power frequency or automatically realize controlling the winding short circuit, compare the total power frequency control, its system reliability is high, do not need independent soft initiator, system's manufacturing cost is lower.The power ratio control that consumes is not more than motor maximum power 30%, compares more energy-conservationly with the total power frequency control, and operating cost is low.Both can be operated in the electric operation mode, also can be operated in the running under braking mode, omnidistance frequency control that can be from the zero-speed to the normal speed.The present invention is applicable to long-time running with the load more than leg speed, with only carrying out the high-power brushless double-fed motor of acceleration and deceleration below leg speed, also is applicable to the frequent or high-power brushless double-fed motor that move below with leg speed for a long time of acceleration and deceleration.
Both can make the power winding of high-power brushless double-fed motor can share a power supply with the control winding, also can make the independent high voltage source of power winding utilization, reduce the current loss of brushless double-fed motor stator, raise the efficiency.Can carry out rotating to high-power brushless double-fed motor and control function: can be according to operating instruction, automatic switchover electrical network phase sequence and excitation phase sequence change motor rotation direction.Compared the brush doubly-fed adjustable speed, not existing needs the brush of periodic maintenance parts, safeguards simple.Frequency conversion speed-adjusting system of the present invention is widely used in the brushless electric motivation of any rotor structures such as special cage-type rotor, reluctance type rotor, wound rotor and composite rotors.
Below in conjunction with accompanying drawing, embodiments of the invention are described further.
Description of drawings
Fig. 1 is the structural representation of high-power brushless double-fed motor variable frequency speed control system embodiment 1;
Fig. 2 is the structural representation of high-power brushless double-fed motor variable frequency speed control system embodiment 2;
Fig. 3 is the structural representation of high-power brushless double-fed motor variable frequency speed control system embodiment 3;
Fig. 4 is the structural representation of high-power brushless double-fed motor variable frequency speed control system embodiment 4;
Fig. 5 utilizes frequency conversion speed-adjusting system of the present invention to carry out a kind of method flow diagram of high-power brushless double-fed motor speed regulating control;
Fig. 6 utilizes frequency conversion speed-adjusting system of the present invention to carry out the another kind of method flow diagram of high-power brushless double-fed motor speed regulating control.
Embodiment
As shown in Figure 1, the present embodiment 1 comprises excitation controller 8, inversion unit 10, the first current detecting unit 2, the second current detecting unit 7, voltage detection unit 13, storage capacitor 11, soft starting circuit 14, full-bridge rectification unit 15, input switch 12, low voltage electric network power supply unit 18, transformer 19, high-voltage fence power supply unit 20, the first contactor 1, operation and display unit 9, brake unit 16 and brake resistance 17.Wherein, excitation controller 8, inversion unit 10, the first current detecting unit 2, the second current detecting unit 7, voltage detection unit 13 forms excitations to be controlled and inversion modules 51, and excitation controller 8 comprises serial communication interface, general I/O interface 5 and special-purpose remote communication interface 6.
the three-phase output end of the three-phase incoming line series connection first rear connection high-voltage fence of contactor 1 power supply unit 20 of the power winding 4 of high-power brushless double-fed motor, 18 of high-voltage fence power supply unit 20 and low voltage electric network power supply units pass through connection transformer 19, adaptive voltage of power, the three-phase output end of low voltage electric network power supply unit 18 connects the three-phase input end of input switch 12 by three-phase line, the three-phase output end of input switch 12 connects full-bridge rectification unit 15 three-phase input ends by three-phase line, the positive and negative dc bus of full-bridge rectification unit 15 outputs is sequentially connected after soft starting circuit 14 and storage capacitor 11, the positive and negative direct-flow input end of inversion unit 10 that connects excitation control and inversion module 51, the three-phase output end of inversion unit 10 connects the control winding 3 of high-power brushless double-fed motor by three-phase line, also be parallel with brake unit 16 on the positive and negative dc bus between soft starting circuit 14 and storage capacitor 11, brake unit 16 also is parallel with brake resistance 17, the current signal collection terminal M of the first current detecting unit 2 is connected on three-phase line between the first contactor 1 and power winding 4, and the output of the first current detecting unit 2 is connected to the first signal input of excitation controller 8, the current signal collection terminal M of the second current detecting unit 7 is connected in inversion unit 10 and controls on three-phase line between winding 3, and the output of the second current detecting unit 7 is connected to the secondary signal input of excitation controller 8, the voltage signal acquisition end of voltage detection unit 13 is connected on the three-phase line between low voltage electric network power supply unit 18 and input switch 12, and the output of voltage detection unit 13 is connected to the 3rd signal input part of excitation controller 8, the pwm signal output of excitation controller 8 is connected with the pwm signal input of inversion unit 10.
High-voltage fence power supply unit 20 is used for the high-tension electricity of access local power grid or power supply,
Low voltage electric network power supply unit 18 is used for the low-voltage power of access local power grid or power supply.
As shown in Figure 2, in the present embodiment 2, on the structure of embodiment 1 substantially constant basis, low voltage electric network power supply unit 18 directly accesses the low-voltage power of local power grid or power supply, low voltage electric network power supply unit 18 three-phase output ends are directly by the connect three-phase input end of power winding 4 of the first rear connection high-power brushless double-fed motor of contactor 1 of three-phase line, and low voltage electric network power supply unit 18 another group three-phase output ends keep to full-bridge rectification unit 15 output low-voltage powers simultaneously.
Embodiment 1 is fit to the speed regulating control of the above high-power brushless double-fed motor of 1000kw, the speed regulating control that embodiment 2 is fit to high-power brushless double-fed motor between 300kw-1000kw adopts, power ratio control only has 30% of motor maximum power, and cost hangs down and has stronger economic feasibility.
As shown in Figure 3, the present embodiment 3 comprises excitation controller 8, inversion unit 10, the first current detecting unit 2, the second current detecting unit 7, voltage detection unit 13, storage capacitor 11, PWM rectification unit 21, BOOST reactor 22, soft starting circuit 14, input switch 12, low voltage electric network power supply unit 18, transformer 19, high-voltage fence power supply unit 20, the first contactor 1 and operation and display unit 9.Wherein, excitation controller 8, inversion unit 10, the first current detecting unit 2, the second current detecting unit 7, voltage detection unit 13 forms excitations to be controlled and inversion modules 51, and excitation controller 8 comprises serial communication interface, general I/O interface 5 and special-purpose remote communication interface 6.
the three-phase incoming line series connection first rear connection high-voltage fence of contactor 1 power supply unit 20 of the power winding 4 of high-power brushless double-fed motor, 18 of high-voltage fence power supply unit 20 and low voltage electric network power supply units pass through connection transformer 19, adaptive voltage of power, the three-phase output end of low voltage electric network power supply unit 18 connects the three-phase input end of input switch 12 by three-phase line, the three-phase output end of input switch 12 is connected rear connection PWM rectification unit 21 three-phase input ends by three-phase line order series connection soft starting circuit 14 with the BOOST reactor, after the positive and negative dc bus series connection accumulation electric capacity 11 of PWM rectification unit 21 outputs, the positive and negative direct-flow input end that connects the inversion unit 10 of excitation control and inversion module 51, the three-phase output end of inversion unit 10 connects the control winding 3 of high-power brushless double-fed motor by three-phase line, the current signal collection terminal M of the first current detecting unit 2 is connected on three-phase line between the first contactor 1 and power winding 4, and the output of the first current detecting unit 2 is connected to the first signal input of excitation controller 8, the current signal collection terminal M of the second current detecting unit 7 is connected in inversion unit 10 and controls on three-phase line between winding 3, and the output of the second current detecting unit 7 is connected to the secondary signal input of excitation controller 8, the voltage signal acquisition end of voltage detection unit 13 is connected on three-phase line between low voltage electric network power supply unit 18 and input switch 12, and the output of voltage detection unit 13 is connected to the 3rd signal input part of excitation controller 8, the pwm signal output of excitation controller 8 is connected with the pwm signal input of inversion unit 10.
As shown in Figure 4, in the present embodiment 4, on the structure of embodiment 3 substantially constant basis, low voltage electric network power supply unit 18 directly accesses the low-voltage power of local power grid or power supply, directly by the connect three-phase input end of power winding 4 of the first rear connection high-power brushless double-fed motor of contactor 1 of three-phase line, low voltage electric network power supply unit 18 another group three-phase output ends keep to PWM rectification unit 21 output low-voltage powers low voltage electric network power supply unit 18 three-phase output ends simultaneously.
In above embodiment, the soft starting circuit 14 on every phase circuit is mainly used in closed as required, to reduce large electric current in motor start-up procedure, avoids electrical equipment impact damage equipment.
High-voltage fence power supply unit 20 is mainly used in accessing high-voltage fence and comprises that 6KV, 10KV and other meet the high-voltage fence of low-pressure industrial electricity consumption; it mainly comprises primary cut-out, high voltage isolator and earthed switch, high voltage load switch, high pressure automatic reclosing and sectionalizer; several large classes such as high-voltage actuating mechanism, high-voltage explosion-proof power distribution equipment and high-tension switch cabinet mainly play the effects such as break-make, control or protection.
Low voltage electric network power supply unit 18 is mainly used in accessing low voltage electric network and comprises that 380V, 220V, 110V and other meet the low voltage electric network of low-pressure industrial electricity consumption, and it mainly includes the equipment of the parts such as low-voltage circuit breaker, Intelligent power distribution device, low-voltage distribution switch, fuse, transformer, earth leakage protective device.
Described transformer 19 can be a kind of in the multiple transformers such as combined transformer, dry-type transformer, oil-filled transformer, single-phase transformer; Connected mode between transformer 19 primary sides and secondary side can be star-like angle type, angle type angle type, star-like fandy star, angle type fandy star.
Input switch 12 can be a kind of in the multiple switches such as air switch, chopper switch, air type electromagnetic contactor, vacuum contactor, semiconductor contactor or permanent magnet contactor.
The first contactor 1 can be a kind of in air type electromagnetic contactor, vacuum contactor, semiconductor contactor, permanent magnet contactor.
Described BOOST reactor 22 directly is connected between PWM rectification unit 21 and soft starting circuit 14, perhaps and non-capacitive element be connected between PWM rectification unit 21 and soft starting circuit 14.
Brake unit 16 and brake resistance 17 work the regenerative electric energy effect that consumes at the same leg speed accelerating sections of brushless double-fed motor or with the regeneration processes such as quick deceleration more than leg speed.
The Mathematical Modeling that the effect of excitation controller 8 is based on brushless dual-feed motor adopts rotating speed, current double closed-loop control algolithm, utilizes the control strategies such as scalar control, direct torque control, vector control, fuzzy control, PID ANN Control to generate pwm control signal.It is the signal processing module of this high-power brushless double-fed motor variable frequency speed control system.
The break-make modulation power semiconductor device that PWM rectification unit 21 is used for PWM copped wave can adopt the multiple devices such as silicon controlled rectifier (SCR), gate electrode capable of switching off device (GTO), power transistor (GTR), MOSFET (Power MOSFET), igbt (IGBT), integrated gate commutated thyristor (IGCT), SGCT (SGCT).
The mode of the unilateral conduction that full-bridge rectification unit 15 has utilized diode by three phase bridge is converted to direct current with three-phase alternating current and delivers to positive and negative dc bus.
The pwm signal (excitation signal) that inversion unit 10 is given according to 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 high-power brushless double-fed motor.Break-make modulation power semiconductor device in inversion unit 10 also can adopt the multiple devices such as silicon controlled rectifier (SCR), gate electrode capable of switching off device (GTO), power transistor (GTR), MOSFET (Power MOSFET), igbt (IGBT), integrated gate commutated thyristor (IGCT), SGCT (SGCT).
Excitation controller 8 is by serial communication interface attended operation and display unit 9 and the first contactor 1, and I/O interface 5 is used for connecting LMT Local Maintenance Terminal, or uploads download-maintenance data etc., and remote communication interface 6 is used for carrying out data with wide area network and is connected.Serial communication mode 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 operation to carry out communication with display unit 9 and excitation controller 8, is used for the parameter setting of system, parameter display such as output voltage, output frequency, power output etc.Or be responsible for other controlled cells such as the first contactor 1 and excitation controller 8 carries out communication, be used for controlling the start and stop of first contactor 1 other controlled cells such as grade.
I/O interface 5 can be also the communication modes interfaces such as Canbus communication, Modbus communication, RS485 communication, RS232 communication, or direct control terminal, participates in the control to excitation controller 8.
Remote communication interface 6 can be the wired or wireless interface of wide area network, by the mode of wired or wireless communication, excitation controller 8 is carried out telecommunication and control.
Soft starting circuit 14 comprises two-phase soft start and two kinds of structure types of single-phase soft start in embodiment 1.
Soft starting circuit 14 comprises three-phase soft start and two kinds of structure types of two-phase soft start in embodiment 3.
The effect of described soft starting circuit 14 is that the switch in closed soft starting circuit to reduce the large electric current in motor start-up procedure, is avoided electrical impact infringement equipment on demand.
Described the first current detecting unit 2 is Hall current sensor, its connected mode is according to Hall base husband current law iu+iv+iw=0, as long as so measure the electric current of any two-phase on three-phase AC line, just can calculate the third phase size of current, therefore at this, the connected mode of current sensor can be selected to adopt two Hall current sensors to carry out two to be connected, also can to adopt three Hall current sensors that three-phase is all connected.
Described storage capacitor 11 can be a kind of in the Various Components such as 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, lithium ion battery.
As shown in Figure 5, the key step of utilizing embodiment 1 or 2 to carry out the method for high-power brushless double-fed motor speed regulating control (sequential) comprises:
S100, closed input switch 12, soft starting circuit 14 work, system judges whether the voltage on storage capacitor 11 reaches operating point.
After if the voltage on s110 storage capacitor 11 does not reach operating point, soft starting circuit 14 discharges, and demonstration that system is under-voltage is shut down, and re-starts judgement;
After if the voltage on s120 storage capacitor 11 reaches operating point, soft starting circuit 14 closures;
S200, voltage detection unit 13 detect change in voltage on three-phase line between low voltage electric network power supply unit 18 and input switch 12 by the voltage signal acquisition end, send image data to excitation controller 8, excitation controller 8 carries out phase-locked processing to its frequency and phase place;
S300, carry out the operations such as control command, frequency, sampling by I/O interface 5, remote communication interface 6, operation and 9 pairs of excitation controllers of display unit 8; After receiving action command, excitation controller 8 sends the output voltage of same frequency and antiphase according to frequency and the phase place of electrical network from the pwm signal output;
S400, the time-delay a period of time after, closed the first contactor 1, high-power brushless double-fed motor is in the zero-speed running status;
After s500, end time-delay, excitation controller 8 is according to the frequency of setting and Acceleration and deceleration time operation; Detect the curent change of the different windings of brushless double-fed motor by the first current detecting unit 2 and the second current detecting unit 7; And control by operation and display unit 9, general purpose I/O interface 5 or remote communication interface 6;
S600, after excitation controller 8 receives halt command, according to deceleration time, first decelerate to zero-speed, then the control input end by the first contactor 1 controls and disconnects the first contactor 1, then through closing excitation output after time-delay.
By this control sequential and method, brake unit 16, perhaps works with the regeneration processes such as quick deceleration more than leg speed to the leg speed accelerating sections in zero-speed.Make frequency conversion speed-adjusting system of the present invention be applicable to long-time running with the load more than leg speed, with only carrying out the occasion of acceleration and deceleration below leg speed.
As shown in Figure 6, the key step of utilizing embodiment 3 or 4 to carry out the method for high-power brushless double-fed motor speed regulating control (sequential) comprises:
S10, closed input switch 12, soft starting circuit 14 work, system judges whether the voltage on storage capacitor 11 reaches operating point;
After if the voltage on s11 storage capacitor 11 does not reach operating point, soft starting circuit 14 discharges, and demonstration that system is under-voltage is shut down, and re-starts judgement;
After if the voltage on s12 storage capacitor 11 reaches operating point, soft starting circuit 14 closures;
S20, voltage detection unit 13 detect change in voltage on three-phase line between low voltage electric network power supply unit 18 and input switch 12 by the voltage signal acquisition end, send image data to excitation controller 8, excitation controller 8 carries out phase-locked processing to its frequency and phase place, and PWM rectification unit 21 is started working;
S30, carry out the operations such as control command, frequency, sampling by I/O interface 5, remote communication interface 6, operation and 9 pairs of excitation controllers of display unit 8; After receiving action command, excitation controller 8 sends the output voltage of same frequency and antiphase according to frequency and the phase place of electrical network from the pwm signal output;
S40, the time-delay a period of time after, closed the first contactor, motor is in the zero-speed running status;
After s50, end time-delay, excitation controller 8 is according to the frequency of setting and Acceleration and deceleration time operation; Detect the curent change of the different windings of brushless double-fed motor by the first current detecting unit 2 and the second current detecting unit 7; And control by operation and display unit 9, general purpose I/O interface 5 or remote communication interface 6;
S60, after excitation controller 8 receives halt command, according to deceleration time, first decelerate to zero-speed, then the control input end by the first contactor 1 controls and disconnects the first contactor 1, then through closing excitation output after time-delay.
This control sequential and method are more suitable for the frequent acceleration and deceleration of high-power brushless double-fed motor rotating speed are controlled, also being applicable to the rotating speed that the high-power brushless double-fed motor rotating speed moves below with leg speed for a long time controls, can make regenerated energy feedback power grid, efficient is higher.
Above-described embodiment is described the preferred embodiment of the present invention; be not that scope of the present invention is limited; design under the prerequisite of spirit not breaking away from the present invention; various distortion and improvement that those of ordinary skills make technical scheme of the present invention all should fall in the definite protection range of claims of the present invention.

Claims (10)

1. high-power brushless double-fed motor variable frequency speed control system, comprise the power winding of high-power brushless double-fed motor and control winding, it is characterized in that: also comprise the first contactor, input power power supply unit, input switch, soft starting circuit, alternating current-direct current rectification unit, storage capacitor, operation and display unit, and controlled and inversion module by the excitation that excitation controller, inversion unit, the first current detecting unit, the second current detecting unit, voltage detection unit form;
a three-phase output end that connects described input power power supply unit after three-phase incoming line series connection first contactor of described power winding, another three-phase output end of described input power power supply unit connects the three-phase input end of described input switch by three-phase line, the three-phase output end of described input switch connects the three-phase input end of described alternating current-direct current rectification unit by three-phase line, the positive and negative dc bus of described alternating current-direct current rectification unit output is sequentially connected after described storage capacitor, the positive and negative direct-flow input end that connects described inversion unit, the three-phase output end of described inversion unit connects described control winding by three-phase line, described soft starting circuit is connected on circuit between the three-phase output end of described alternating current-direct current rectification unit and described input switch, or be connected on circuit between described alternating current-direct current rectification unit and storage capacitor, carrying out data by serial communication mode between described operation and display unit and described excitation controller is connected,
Described excitation controller gathers the curent change of three-phase line between described power winding and the first contactor by described the first current detecting unit, control the curent change of three-phase line between winding and described inversion unit by described the second current detecting unit collection, gather the change in voltage of three-phase line between described input switch and described input power power supply unit by described voltage detection unit, and generate the control signal of controlling described the first contactor and generate the pwm signal of controlling described inversion unit output.
2. high-power brushless double-fed motor variable frequency speed control system according to claim 1, it is characterized in that: described alternating current-direct current rectification unit is full-bridge rectification unit (15), also comprise brake unit (16) and brake resistance (17), described soft starting circuit (14) is connected on dc bus between full-bridge rectification unit (15) output and described storage capacitor (11), described brake unit in parallel (16) on positive and negative dc bus between described soft starting circuit (14) and described storage capacitor, described brake unit (16) described brake resistance in parallel (17).
3. high-power brushless double-fed motor variable frequency speed control system according to claim 1, it is characterized in that: described alternating current-direct current rectification unit is PWM rectification unit (21), also comprise BOOST reactor (22), connect described soft starting circuit (14) and described BOOST reactor (22) of order on the circuit between the three-phase output end of described input switch (12) and PWM rectification unit (21).
4. according to claim 2 or 3 described high-power brushless double-fed motor variable frequency speed control systems, it is characterized in that: described input power power supply unit is low voltage electric network power supply unit (18).
5. according to claim 2 or 3 described high-power brushless double-fed motor variable frequency speed control systems, it is characterized in that: described input power power supply unit comprises high-voltage fence power supply unit (20) and low voltage electric network power supply unit (18), also comprise transformer (19), described first contactor of three-phase output end series connection of described high-voltage fence power supply unit (20), another three-phase output end of described high-voltage fence power supply unit (20) is connected with the primary side of described transformer (19), the secondary side of described transformer (19) connects the power input of described low voltage electric network power supply unit (18), the three-phase output end of described low voltage electric network power supply unit (18) connects the three-phase input end of input switch (12) by three-phase line.
According to claim 3 to 5 arbitrary described high-power brushless double-fed motor variable frequency speed control system, it is characterized in that: described BOOST reactor (22) directly is connected between PWM rectification unit (21) and soft starting circuit (14), perhaps and non-capacitive element be connected between PWM rectification unit (21) and soft starting circuit (14).
According to claim 1 to 5 arbitrary described high-power brushless double-fed motor variable frequency speed control system, it is characterized in that: adopt three-phase soft start or two-phase soft start syndeton when described soft starting circuit (14) is used for three-phase line, adopt two-phase soft start or single-phase soft start syndeton when described soft starting circuit (14) is used for positive and negative DC line.
According to claim 1 to 5 arbitrary described high-power brushless double-fed motor variable frequency speed control system, it is characterized in that: described PWM rectification unit (21) and described inversion unit (10) are used for break-make modulation power semiconductor device can adopt a kind of of silicon controlled rectifier, gate electrode capable of switching off device, power transistor, MOSFET, igbt, integrated gate commutated thyristor, SGCT.
9. the control method of utilizing the arbitrary described high-power brushless double-fed motor variable frequency speed control system of claim 1 to 8 to carry out frequency control is characterized in that comprising the following steps:
S100, closed input switch (12), soft starting circuit (14) work, system judges whether the voltage on storage capacitor (11) reaches operating point;
After if the voltage on s110 storage capacitor (11) does not reach operating point, soft starting circuit (14) discharges, and demonstration that system is under-voltage is shut down, and re-starts judgement;
After if the voltage on s120 storage capacitor (11) reaches operating point, soft starting circuit (14) closure;
S200, voltage detection unit (13) detect change in voltage on three-phase line between low voltage electric network power supply unit (18) and input switch (12) by the voltage signal acquisition end, send image data to excitation controller (8), excitation controller (8) carries out phase-locked processing to its frequency and phase place;
S300, by I/O interface (5) or remote communication interface (6) or operation and display unit (9), excitation controller (8) is carried out the operations such as control command, frequency, sampling; After receiving action command, excitation controller (8) sends the output voltage of same frequency and antiphase according to frequency and the phase place of electrical network from the pwm signal output;
S400, the time-delay a period of time after, closed the first contactor (1), high-power brushless double-fed motor is in the zero-speed running status;
After s500, end time-delay, excitation controller (8) is according to the frequency of setting and Acceleration and deceleration time operation; Detect the curent change of the different windings of brushless double-fed motor by the first current detecting unit (2) and the second current detecting unit (7); And control by operation and display unit (9) or general purpose I/O interface (5) or remote communication interface (6);
S600, after excitation controller (8) receives halt command, according to deceleration time, first decelerate to zero-speed, then the control input end by the first contactor (1) controls and disconnects the first contactor (1), then through closing excitation output after time-delay.
10. the control method of utilizing the arbitrary described high-power brushless double-fed motor variable frequency speed control system of claim 1 to 8 to carry out frequency control is characterized in that comprising the following steps:
S10, closed input switch (12), soft starting circuit (14) work, system judges whether the voltage on storage capacitor (11) reaches operating point;
After if the voltage on s11 storage capacitor (11) does not reach operating point, soft starting circuit (14) discharges, and demonstration that system is under-voltage is shut down, and re-starts judgement;
After if the voltage on s12 storage capacitor (11) reaches operating point, soft starting circuit (14) closure;
S20, voltage detection unit (13) detect change in voltage on three-phase line between low voltage electric network power supply unit (18) and input switch (12) by the voltage signal acquisition end, send image data to excitation controller (8), excitation controller (8) carries out phase-locked processing to its frequency and phase place, and PWM rectification unit (21) is started working;
S30, by I/O interface (5) or remote communication interface (6) or operation and display unit (9), excitation controller (8) is carried out the operations such as control command, frequency, sampling; After receiving action command, excitation controller (8) sends the output voltage of same frequency and antiphase according to frequency and the phase place of electrical network from the pwm signal output;
S40, the time-delay a period of time after, closed the first contactor, motor is in the zero-speed running status;
After s50, end time-delay, excitation controller (8) is according to the frequency of setting and Acceleration and deceleration time operation; Detect the curent change of the different windings of brushless double-fed motor by the first current detecting unit (2) and the second current detecting unit (7); And control by operation and display unit (9) or general purpose I/O interface (5) or remote communication interface (6);
S60, after excitation controller (8) receives halt command, according to deceleration time, first decelerate to zero-speed, then the control input end by the first contactor (1) controls and disconnects the first contactor (1), then through closing excitation output after time-delay.
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CN108462412A (en) * 2018-03-09 2018-08-28 周顺新 Brushless feedback electric-machine directly-driven intelligence control system
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CN110011555A (en) * 2019-05-10 2019-07-12 安徽大学 A kind of charge control method of diode clamp three-level converter DC bus capacitor
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CN113014159A (en) * 2019-12-19 2021-06-22 丹东山川电机有限公司 Motor starting method for testing performance of TYCD self-starting permanent magnet synchronous motor
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