CN105207546A - Pre-production biogas fermentation control system based on brushless direct current motor - Google Patents

Pre-production biogas fermentation control system based on brushless direct current motor Download PDF

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Publication number
CN105207546A
CN105207546A CN201510570944.7A CN201510570944A CN105207546A CN 105207546 A CN105207546 A CN 105207546A CN 201510570944 A CN201510570944 A CN 201510570944A CN 105207546 A CN105207546 A CN 105207546A
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CN
China
Prior art keywords
motor
dsp
control
sensor
biogas fermentation
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Pending
Application number
CN201510570944.7A
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Chinese (zh)
Inventor
周闯
秦国辉
王玉鹏
刘伟
王欣
郭广亮
苏小红
陆佳
罗向东
徐晓秋
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Energy and Environment Research Institute of Heilongjiang Province
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Energy and Environment Research Institute of Heilongjiang Province
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Priority to CN201510570944.7A priority Critical patent/CN105207546A/en
Publication of CN105207546A publication Critical patent/CN105207546A/en
Pending legal-status Critical Current

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    • Y02B60/50

Abstract

The invention provides a pre-production biogas fermentation control system based on a brushless direct current motor and belongs to the field of automatic control. The system solves the problems that an existing pre-production biogas fermentation control system is low in efficiency and large in energy consumption. The system comprises a DSP, a computer, a handheld wireless manipulator, a motor driver, a gate switch, a sensor and a motor. The DSP receives control signals of the computer or the handheld wireless manipulator. The DSP drives the motor driver and the gate switch according to the control signals. The motor driver drives the motor to be started. The DSP receives sensor signals of the sensor. The DSP adjusts the control signals of the motor according to the sensor signals. The DSP and the computer communicate through an RS232. The DSP and the handheld wireless manipulator communicate through an nRF905 wireless module. The gate switch is used for controlling a gate of a material conveying pipe. The motor is used for driving a screw pump for conveying biogas fermentation viscous fluid. The system is used for biogas fermentation.

Description

Based on the pilot scale biogas fermentation control system of brshless DC motor
Technical field
The present invention relates to a kind of pilot scale biogas fermentation control system, belong to automation field.
Background technology
The control system of current biogas fermentation is generally take PLC as control core, and perform driving with transducer drive threephase asynchronous, in real work, there are the following problems:
The module such as 1.PLC and attached frequency converter thereof expensive:
PLC with the extensive use in the industry of the control performance of its excellence, but for using PLC and attached expansion module thereof in small-sized biogas fermentation pilot test system, too high in the input of cost.
2. the input and output material executive system of threephase asynchronous composition, control precision is low, and response speed is slow:
In pilot plant test, the doses of input and output material can have a direct impact test gas production, therefore must ensure to pass in and out doses accurately.The rotor inertia of threephase asynchronous is comparatively large, and namely very difficult realization rises and namely stop, and realizes accurately controlling to turnover doses.
3. the inefficiency of threephase asynchronous, energy consumption are large:
Threephase asynchronous be by stator and rotor between electromagnetic induction rotate, can large losses energy in the process setting up energy conventional via, cause that the power factor of motor is low, efficiency is poor, have lost a large amount of electric energy.
4. unsound, the safeguard measure imperfection of Control system architecture.
Summary of the invention
The present invention seeks to, in order to solve the problem that existing pilot scale biogas fermentation control system efficiency is low, energy consumption is large, to provide a kind of pilot scale biogas fermentation control system based on brshless DC motor.
Pilot scale biogas fermentation control system based on brshless DC motor of the present invention, this control system comprises DSP, computer, hand-hold wireless control device, motor driver, knife switch, transducer and motor;
The control signal of DSP receiving computer or hand-hold wireless control device, DSP is according to the control signal received drive motor driver and knife switch simultaneously, motor driver drive motors starts, the sensor signal of DSP receiving sensor, DSP regulates according to the control signal of sensor signal to motor;
DSP and computer adopt RS232 to carry out communication, and DSP and hand-hold wireless control device adopt nRF905 wireless module to carry out wireless telecommunications;
Knife switch is for controlling the gate of conveying pipeline;
Motor is for driving the screw pump of methane conveying fermentation viscous fluid.
Advantage of the present invention: the present invention proposes a kind of pilot scale biogas fermentation control system based on brshless DC motor, the brushless, permanently excited direct current motor of efficiency is high, good speed adjustment features is as fermentation system drive motors, system energy consumption can be reduced, optimize execution performance, input and output material controlled quentity controlled variable is more accurate.Electric machine control system adopts rotating speed and current double closed-loop speed governing, adds " fuzzy control " intelligent algorithm, and speed adjusting performance is better, and control performance is more accurate; Perfect fault detect and safeguard measure are set, carry out fault distinguishing in time and control adjustment, ensureing carrying out smoothly of system works; Peripheral hardware hand-hold wireless control panel, operation is not only limited in man-machine interface, regulates and controls more flexible.
Accompanying drawing explanation
Fig. 1 is the structural representation of the pilot scale biogas fermentation control system based on brshless DC motor of the present invention;
Fig. 2 is the Electric Machine Control schematic diagram of the pilot scale biogas fermentation control system based on brshless DC motor of the present invention;
Fig. 3 is the speed waveform figure of permanent-magnet brushless DC electric machine;
Fig. 4 is the speed waveform figure of threephase asynchronous machine.
Embodiment
Embodiment one: present embodiment is described below in conjunction with Fig. 1, based on the pilot scale biogas fermentation control system of brshless DC motor described in present embodiment, this control system comprises DSP1, computer 2, hand-hold wireless control device 3, motor driver 4, knife switch 5, transducer 6 and motor 7;
The control signal of DSP1 receiving computer 2 or hand-hold wireless control device 3, DSP1 is according to the control signal received drive motor driver 4 and knife switch 5 simultaneously, motor driver 4 drive motors 7 starts, the sensor signal of DSP1 receiving sensor 6, DSP1 regulates according to the control signal of sensor signal to motor;
DSP1 and computer 2 adopt RS232 to carry out communication, and DSP1 and hand-hold wireless control device 3 adopt nRF905 wireless module to carry out wireless telecommunications;
Knife switch 5 is for controlling the gate of conveying pipeline;
Motor 7 is for driving the screw pump of methane conveying fermentation viscous fluid.
Embodiment two: present embodiment is described below in conjunction with Fig. 2, present embodiment is described further execution mode one, motor 7 adopts permanent-magnet brushless DC electric machine, transducer 6 hall position sensor 6-1, position-sensor-free 6-2 and current sensor 6-3, the driving process of permanent-magnet brushless DC electric machine is: hall position sensor 6-1 obtains the position signalling of motor 7, and DSP1 calculates the present speed n of motor 7 according to position signalling *, DSP1 is by the initial velocity n of motor 7 and present speed n *differ from, fuzzy control calculating is carried out to difference, obtain first time fuzzy control output valve u (k), current sensor 6-3 detects the current value of motor 7, DSP1 carries out fuzzy control calculating after fuzzy control output valve u (k) and the current value of motor 7 are made difference, obtain second time fuzzy control output valve u ' (k), motor driver 4 controls the rotation of motor 7 according to second time fuzzy control output valve u ' (k).
In present embodiment, adopt inverter control permanent-magnet brushless DC electric machine to carry out forward and reverse running, when holddown or grog pipe choking, be conducive to the reverse discharge of foreign material.
Embodiment three: present embodiment is described below in conjunction with Fig. 2, present embodiment is described further execution mode one, and motor driver 4 adopts inverter.
Embodiment four: present embodiment is described further execution mode three, when DSP1 detects fault, DSP1 failure judgement type, when fault type is position signalling disappearance, DSP1 controls hall position sensor 6-1 and closes, open position-sensor-free 6-2, the driving process of permanent-magnet brushless DC electric machine switches to position Sensorless Control mode to work; When fault type is screw pump holddown, conveying pipeline obstruction or motor 7 overcurrent-overvoltage, DSP1 controls motor 7 and quits work, and sends alarm signal; When fault type is knife switch 5 misoperation, DSP1 controls motor 7 to be continued to run, and regulating gate switch 5 is locked simultaneously.
In present embodiment, position Sensorless Control mode can ensure the orderly function of feed system.
In the present invention, motor 7 adopts permanent-magnet brushless DC electric machine, the control of brshless DC motor is designed to rotating speed and current double loop speed-regulating system, as shown in Figure 2.Outer shroud is speed ring, plays a major role to rotational speed regulation; Inner ring is electric current loop, the coupling of primary responsibility load torque.Wherein, add " fuzzy control " intelligent algorithm, speed adjusting performance is better.
Efficient brushless, permanently excited direct current motor is applied to biogas fermentation to drive field by the present invention, replaces threephase asynchronous as the drive motors of biogas fermentation control system.Table 1 is the comparison of permanent-magnet brushless DC electric machine and threephase asynchronous machine performance:
Table 1 permanent-magnet brushless DC electric machine and threephase asynchronous machine Performance comparision
As can be seen from Table 1, brshless DC motor in electric efficiency, control cost, be all better than threephase asynchronous machine in speed adjusting performance and control precision.
Permanent-magnet brushless DC electric machine drives rotor running by electronic commutation, there is speed responsive characteristic fast, as shown in Figure 3 and Figure 4, the speed that the start-stop of permanent-magnet brushless DC electric machine and rotating speed switch is more than 100 times of threephase asynchronous machine, therefore more accurate in the control of input and output material.
Pilot scale biogas fermentation control system based on brshless DC motor of the present invention, can electrical energy saving energy consumption, in artificial presence, input and output material can not be completed at regular time and quantity, and can the failure problems occurred in input and output material process be processed automatically, ensure system safety operation.

Claims (4)

1. based on the pilot scale biogas fermentation control system of brshless DC motor, it is characterized in that, this control system comprises DSP (1), computer (2), hand-hold wireless control device (3), motor driver (4), knife switch (5), transducer (6) and motor (7);
The control signal of DSP (1) receiving computer (2) or hand-hold wireless control device (3), DSP (1) is according to the control signal received drive motor driver (4) and knife switch (5) simultaneously, motor driver (4) drive motors (7) starts, the sensor signal of DSP (1) receiving sensor (6), DSP (1) regulates according to the control signal of sensor signal to motor;
DSP (1) and computer (2) adopt RS232 to carry out communication, and DSP (1) and hand-hold wireless control device (3) adopt nRF905 wireless module to carry out wireless telecommunications;
Knife switch (5) is for controlling the gate of conveying pipeline;
Motor (7) is for driving the screw pump of methane conveying fermentation viscous fluid.
2. the pilot scale biogas fermentation control system based on brshless DC motor according to claim 1, it is characterized in that, described motor (7) adopts permanent-magnet brushless DC electric machine, transducer (6) comprises hall position sensor (6-1), position-sensor-free (6-2) and current sensor (6-3), the driving process of permanent-magnet brushless DC electric machine is: hall position sensor (6-1) obtains the position signalling of motor (7), and DSP (1) calculates the present speed n of motor (7) according to position signalling *, DSP (1) is by the initial velocity n of motor (7) and present speed n *differ from, fuzzy control calculating is carried out to difference, obtain first time fuzzy control output valve u (k), current sensor (6-3) detects the current value of motor (7), DSP (1) carries out fuzzy control calculating after fuzzy control output valve u (k) and the current value of motor (7) are made difference, obtain second time fuzzy control output valve u ' (k), motor driver (4) controls the rotation of motor (7) according to second time fuzzy control output valve u ' (k).
3. the pilot scale biogas fermentation control system based on brshless DC motor according to claim 2, is characterized in that, motor driver (4) adopts inverter.
4. the pilot scale biogas fermentation control system based on brshless DC motor according to claim 3, it is characterized in that, when DSP (1) detects fault, DSP (1) failure judgement type, when fault type is position signalling disappearance, DSP (1) controls hall position sensor (6-1) and closes, and open position-sensor-free (6-2), the driving process of permanent-magnet brushless DC electric machine switches to position Sensorless Control mode to work; When fault type is screw pump holddown, conveying pipeline obstruction or motor (7) overcurrent-overvoltage, DSP (1) controls motor (7) and quits work, and sends alarm signal; When fault type is knife switch (5) misoperation, DSP (1) controls motor (7) to be continued to run, and regulating gate switch (5) is locked simultaneously.
CN201510570944.7A 2015-09-09 2015-09-09 Pre-production biogas fermentation control system based on brushless direct current motor Pending CN105207546A (en)

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Application Number Priority Date Filing Date Title
CN201510570944.7A CN105207546A (en) 2015-09-09 2015-09-09 Pre-production biogas fermentation control system based on brushless direct current motor

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107241035A (en) * 2017-05-24 2017-10-10 北京控制工程研究所 A kind of BLDCM Drive System with conducting ring failure tolerant function

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202906810U (en) * 2012-09-04 2013-04-24 博爱县电业公司 Brushless direct current motor fuzzy PID control system based on DSP
CN103199774A (en) * 2012-01-06 2013-07-10 沈阳新松机器人自动化股份有限公司 Device and method for drive control of servo direct current motor
CN103438920A (en) * 2013-08-23 2013-12-11 同济大学 Fault diagnosis method, fault-tolerant control method and fault-tolerant control system of BLDC position sensor
US9231504B2 (en) * 2012-05-15 2016-01-05 Robert Lyle Fuller Electrical control system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103199774A (en) * 2012-01-06 2013-07-10 沈阳新松机器人自动化股份有限公司 Device and method for drive control of servo direct current motor
US9231504B2 (en) * 2012-05-15 2016-01-05 Robert Lyle Fuller Electrical control system
CN202906810U (en) * 2012-09-04 2013-04-24 博爱县电业公司 Brushless direct current motor fuzzy PID control system based on DSP
CN103438920A (en) * 2013-08-23 2013-12-11 同济大学 Fault diagnosis method, fault-tolerant control method and fault-tolerant control system of BLDC position sensor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107241035A (en) * 2017-05-24 2017-10-10 北京控制工程研究所 A kind of BLDCM Drive System with conducting ring failure tolerant function

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