CN103368489A - PWM variable frequency speed control system based on control of DSP - Google Patents
PWM variable frequency speed control system based on control of DSP Download PDFInfo
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- CN103368489A CN103368489A CN2013102930119A CN201310293011A CN103368489A CN 103368489 A CN103368489 A CN 103368489A CN 2013102930119 A CN2013102930119 A CN 2013102930119A CN 201310293011 A CN201310293011 A CN 201310293011A CN 103368489 A CN103368489 A CN 103368489A
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Abstract
The invention relates to a PWM variable frequency speed control system based on the control of a DSP, and belongs to the technical field of intelligent electrical engineering and electric apparatuses. A motor and an inverter are seen as a whole. A space voltage vector analytical method is adopted for conducting flux linkage and torque calculation on a stator coordinate system, and the torque is directly controlled through a selection of different on-off states of the inverter. Direct torque control is adopted in a control method, and is another novel efficient variable frequency speed control technology after the vector control technology. The direct torque control technology is adopted in the stator coordinate system for calculating the flux linkage and the torque of the motor. Firstly, a dibit controller is adopted, two control signals are directly utilized in the PWM inverter to generate output voltage, and rotation transformation and current control are eliminated, so that the structure of the controller is simplified. Secondly, the stator flux linkage is selected as a controlled variable, so that the model calculating the flux linkage cannot be affected by rotor change, and robustness of the system is improved. Moreover, due to the fact that direct torque control is adopted, rapid torque response can be acquired in the speed-up, speed-down and load change dynamic processes, and variable frequency speed control can be simply and effectively conducted.
Description
Technical field
The present invention relates to a kind of PWM frequency conversion speed-adjusting system of DSP-based control, be applicable to the ac variable frequency speed regulation of motor, belong to the Intelligent electrical technical field of electric appliances.
Background technology
Through retrieval, mainly contain at present following several about the AC speed regulating control technology: 1) voltage-frequency is coordinated control, below fundamental frequency, make the ratio of voltage magnitude and frequency keep constant when referring to speed governing, the operation of realization speed regulation by constant torque, when the above speed governing of fundamental frequency, output voltage maintains rated value, makes the minimizing that is inversely proportional to of magnetic flux and frequency, realizes weak magnetic constant-power speed regulation operation; 2) speed closed loop revolutional slip speed governing, it is to adopt speed closed loop control, the rotating speed deviation of given rotating speed and detection obtains revolutional slip through the PI adjuster; 3) vector control, it is for solving alternating current machine torque control problem, its main thought is based on coordinate transform three-phase system is reduced to binary system, again by rotor field-oriented synchronous rotation transformation, realize decoupling zero between stator excitation component and the torque component, thereby the magnetic linkage and the torque that realize alternating current machine are controlled respectively, and the acquisition dynamic and static characteristic similar to Direct Current Governor System; 4) direct torque control, it is motor and inverter to be done as a whole, and usage space Voltage Vector Analysis method is carried out the calculating of magnetic linkage, torque at stator coordinate, and the on off state by magnetic linkage following-up type PWM inverter directly carries out torque control.This control system does not need stator current is carried out decoupling zero, need not the complicated calculations of vector, and simple in structure.
Voltage-frequency is coordinated control in the prior art, and its speed control system structure is simple, can only satisfy the less demanding occasion of general speed governing; The speed governing of speed closed loop revolutional slip, it is based on the asynchronous motor mathematics model of stable state, and magnetic flux is non-constant in the time of dynamically, therefore will affect system's actual dynamic performance; Vector control, its complex structure, the vector amount of calculation is large.
Summary of the invention
The PWM frequency conversion speed-adjusting system that the purpose of this invention is to provide a kind of DSP-based control solves the deficiency that above-mentioned several AC speed regulating control technology exists, and realizes fast torque response, simply and effectively carries out frequency control.
The objective of the invention is to be achieved through the following technical solutions, a kind of PWM frequency conversion speed-adjusting system of DSP-based control is characterized in that described system comprises main circuit, testing circuit and controller; The output that current rectifying and wave filtering circuit in the main circuit connects three-phase input, IPM power model connects motor; Testing circuit comprises current detection circuit, voltage detecting circuit and tachometric survey circuit; The signal of the tachometric survey circuit of the current detection circuit that IPM power model two ends connect respectively in the main circuit, voltage detecting circuit and connection motor is input in the core control circuit of DSP; Controller comprises DSP control chip and peripheral circuit, and the PWM output of DSP control chip produces 6 road pwm signals, exports the PWM input of IPM power model to.
Described voltage detecting circuit is by Hall voltage transducer LV100, two amplifier OP07 AR1, and AR2, resistance R 2-R6, slide rheostat P1, capacitor C 2, diode D7-D8 forms; The 1st pin of LV100 connects and draws resistance R 2, the 2nd pin connects rectification filter circuit output end N end, the low-pass filter circuit series connection that the 4th pin meets a pull down resistor R4 also and R3, C2 form, resistance R 3 connects the end of oppisite phase of amplifier AR1, the in-phase end connecting resistance R5 of AR1 connects the end of oppisite phase of amplifier AR2 again, the in-phase end of AR2 is connected in the middle of diode D7, the D8 of series connection, and the in-phase end of AR2 is output, connects the ADC IN00 end of DSP.
Described current detection circuit is by amplifier TL074 T1, T2, and resistance R 7-R11, capacitor C 3, C4, voltage-stabiliser tube D9 forms; Amplifier T1 end of oppisite phase connects and draws resistance R 7, and contact resistance R8, in-phase end connects amplifier T2, the end of oppisite phase of T2 connects and draws resistance R 10, amplifier T1, series resistance R9 between T2, the in-phase end connecting resistance R11 of T2, be connected on the right-hand member of resistance R 11 after capacitor C 4, the voltage-stabiliser tube D9 parallel connection, the right-hand member of R11 is the ADC IN01 end of output termination DSP.
Described tachometric survey circuit is by photoelectrical coupler TLP521_2 D1, resistance R 12-R14, and capacitor C 5-C6 forms; Rotary encoder E6B2-CWZ6C is adopted in tachometric survey, output A, and the B phase is used for testing the speed.
Described DSP control chip adopts TMS320LF2407A.
Described IPM power model adopts PM25RSB120.
The present invention regards motor and inverter as an integral body, adopts the space voltage vector analytical method to carry out magnetic linkage, torque calculation at stator coordinate, directly torque is controlled by selecting the different on off state of inverter.Three-phase alternating voltage becomes direct current by uncontrollable rectification module, pulsating voltage after the rectification is becoming the galvanic current pressure after excessive condenser paper is sliding, by the IPM circuit this direct voltage is carried out copped wave again, form voltage and the adjustable three-phase alternating current of frequency and offer motor, thereby realize the frequency control of motor.Control method adopts direct torque control, and it is another novel high-efficiency frequency conversion speed adjusting technique after vector control technology.Torque and the magnetic linkage of Study on direct torque control technology calculating motor under stator coordinate, adopt on-and-off controller, and in the PWM inverter, directly produce output voltage with these two control signals, and saved rotation transformation and Current Control, simplify the structure of controller.Secondly, select stator magnetic linkage as controlled volume, the model that calculates magnetic linkage can not be subjected to the impact of rotor variation, has improved the robustness of system.Again owing to having adopted direct torque control, in the dynamic process of acceleration and deceleration and load variations, can obtain fast torque response, simply and effectively carry out frequency control.
Description of drawings
Fig. 1 is system configuration schematic diagram of the present invention;
Fig. 2 is current rectifying and wave filtering circuit schematic diagram of the present invention;
Fig. 3 is IPM circuit diagram of the present invention;
Fig. 4 is voltage detecting circuit schematic diagram of the present invention;
Fig. 5 is current detection circuit schematic diagram of the present invention;
Fig. 6 is tachometric survey circuit theory diagrams of the present invention.
Embodiment
Further specify in conjunction with the accompanying drawings and embodiments the present invention, as shown in Figure 1, the present invention comprises the several parts of main circuit, testing circuit and controller take the DSP chip TMS320LF2407A of TI company as core.Main circuit comprises current rectifying and wave filtering circuit, IPM power model; Testing circuit comprises electric current, voltage detecting circuit and tachometric survey circuit; Rectification module in the current rectifying and wave filtering circuit adopts the uncontrollable rectifier bridge of three-phase; IPM power model inside except three phase full bridge IGBT, also built-in IGBT drive circuit, fault detect protective circuit, the IPM power model adopts PM25RSB120.Because the use of IPM power model; so that main circuit structure is greatly simplified and reliability strengthens; greatly facilitate user's use; when load abnormal or improper use and when producing overvoltage, overcurrent, the fault such as overheated; the IPM power model can start self-protective mechanism; close device for power switching, and output alarm signal is processed for controller.The voltage that voltage, current detection circuit detect among the figure, current signal, after treatment, the rotor angle frequency information that arrives in conjunction with the tachometric survey electric circuit inspection again, jointly be input in the core control circuit of DSP, the PWM output of DSP produces 6 road pwm signals, export the PWM input of IPM power model to, the real-time control of whole control system has namely been finished in the modulation of the pwm signal control motor of the comprehensive DSP output of IPM power model.
As shown in Figure 2, current rectifying and wave filtering circuit is by rectifier diode D1-D6, resistance R 1, and capacitor C 1 forms.Six rectifier diodes form the uncontrollable rectifier bridges of three-phase, series resistance R1, capacitor C 1 and at the circuit two ends.The three-phase alternating current input is through becoming level and smooth direct current output behind the current rectifying and wave filtering circuit.
As shown in Figure 3, IPM electric routing switch power supply JS159 and IPM power model form.The N of JS159, P, V1, V1G, V2, V2G, V3, V3G, V4, the corresponding connection of port mutually of the same name of V4G port and IPM power model, the U of IPM power model, V, the W port connects motor port, the N of IPM power model, the P port connects rectification filter circuit output end, the U+ of IPM power model, U-, V+, V-, W+, W-meet the PWM0 of DSP, PWM1, PWM2, PWM3, PWM4, the port of PWM5.
As shown in Figure 4, voltage detecting circuit is mainly by Hall voltage transducer LV100, two amplifier OP07 AR1, and AR2, resistance R 2-R6, slide rheostat P1, capacitor C 2, diode D7-D8 forms.The 1st pin of LV100 connects and draws resistance R 2, the 2nd pin connects rectification filter circuit output end N end, the 4th pin meets a pull down resistor R4 also and R3, the low-pass filter circuit series connection that C2 forms, resistance R 3 connects the end of oppisite phase of amplifier AR1, and the in-phase end connecting resistance R5 of AR1 connects the end of oppisite phase of amplifier AR2 again, the in-phase end of AR2 is connected on the diode D7 of series connection, in the middle of the D8, the in-phase end of AR2 is output, connects the ADC IN00 end of DSP.The single order low-pass filter circuit plays the effect of filtering, and amplifier OP07 plays the effect of impedance matching, thereby High-frequency Interference obtains filtering.
As shown in Figure 5, current detection circuit is mainly by amplifier TL074 T1, T2, resistance R 7-R11, capacitor C 3, C4, the compositions such as voltage-stabiliser tube D9.Amplifier T1 end of oppisite phase connects and draws resistance R 7, and contact resistance R8, in-phase end connects amplifier T2, the end of oppisite phase of T2 connects and draws resistance R 10, amplifier T1, series resistance R9 between T2, the in-phase end connecting resistance R11 of T2, capacitor C 4 is connected on the right-hand member of resistance R 11 after the voltage-stabiliser tube D9 parallel connection, the right-hand member of R11 is the ADC IN01 end of output termination DSP.The pull-up resistor that the current signal input connects is to the 3.3V analog power, is that for whether the line that detects Hall element and master control borad is normal when line disconnected, current signal was moved 3.3V on directly, and follow-up current foldback circuit is moved.
As shown in Figure 6, the tachometric survey main circuit will be by photoelectrical coupler TLP521_2 D1, resistance R 12-R14, the compositions such as capacitor C 5-C6.The rotary encoder E6B2-CWZ6C of Omron Corp is adopted in tachometric survey, output A, and the B phase is used for testing the speed, because A, the measuring circuit of B phase is identical, only provides the measuring circuit of A phase among the figure, the A phase signals exports the QEP1 of DSP to through the tachometric survey circuit, the QEP2 end.
Current rectifying and wave filtering circuit among the present invention, tachometric survey circuit adopt existing circuit.
Claims (6)
1. the PWM frequency conversion speed-adjusting system of a DSP-based control is characterized in that, described system comprises main circuit, testing circuit and controller; The output that current rectifying and wave filtering circuit in the main circuit connects three-phase input, IPM power model connects motor; Testing circuit comprises current detection circuit, voltage detecting circuit and tachometric survey circuit; The signal of the tachometric survey circuit of the current detection circuit that IPM power model two ends connect respectively in the main circuit, voltage detecting circuit and connection motor is input in the core control circuit of DSP; Controller comprises DSP control chip and peripheral circuit, and the PWM output of DSP control chip produces 6 road pwm signals, exports the PWM input of IPM power model to.
2. the PWM frequency conversion speed-adjusting system of DSP-based control according to claim 1 is characterized in that, described voltage detecting circuit is by Hall voltage transducer LV100, two amplifier OP07 AR1, AR2, resistance R 2-R6, slide rheostat P1, capacitor C 2, diode D7-D8 forms; The 1st pin of LV100 connects and draws resistance R 2, the 2nd pin connects rectification filter circuit output end N end, the low-pass filter circuit series connection that the 4th pin meets a pull down resistor R4 also and R3, C2 form, resistance R 3 connects the end of oppisite phase of amplifier AR1, the in-phase end connecting resistance R5 of AR1 connects the end of oppisite phase of amplifier AR2 again, the in-phase end of AR2 is connected in the middle of diode D7, the D8 of series connection, and the in-phase end of AR2 is output, connects the ADC IN00 end of DSP.
3. the PWM frequency conversion speed-adjusting system of DSP-based control according to claim 1 is characterized in that, described current detection circuit is by amplifier TL074 T1, T2, and resistance R 7-R11, capacitor C 3, C4, voltage-stabiliser tube D9 forms; Amplifier T1 end of oppisite phase connects and draws resistance R 7, and contact resistance R8, in-phase end connects amplifier T2, the end of oppisite phase of T2 connects and draws resistance R 10, amplifier T1, series resistance R9 between T2, the in-phase end connecting resistance R11 of T2, be connected on the right-hand member of resistance R 11 after capacitor C 4, the voltage-stabiliser tube D9 parallel connection, the right-hand member of R11 is the ADC IN01 end of output termination DSP.
4. the PWM frequency conversion speed-adjusting system of DSP-based control according to claim 1 is characterized in that, described tachometric survey circuit is by photoelectrical coupler TLP521_2 D1, resistance R 12-R14, and capacitor C 5-C6 forms; Rotary encoder E6B2-CWZ6C is adopted in tachometric survey, output A, and the B phase is used for testing the speed.
5. the PWM frequency conversion speed-adjusting system of DSP-based control according to claim 1 is characterized in that, described DSP control chip adopts TMS320LF2407A.
6. the PWM frequency conversion speed-adjusting system of DSP-based control according to claim 1 is characterized in that, described IPM power model adopts PM25RSB120.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103986377A (en) * | 2014-06-04 | 2014-08-13 | 国家电网公司 | Direct-current brushless motor control method |
| CN110890851A (en) * | 2019-12-06 | 2020-03-17 | 湖南力诚新能源科技有限公司 | Motor control circuit of electric engineering machinery |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201197132Y (en) * | 2008-02-04 | 2009-02-18 | 深圳市陆地方舟电动车有限公司 | Vector control AC variable-frequency control system of electric car |
| JP2011252818A (en) * | 2010-06-03 | 2011-12-15 | On Semiconductor Trading Ltd | Hall element control circuit |
| CN102324888A (en) * | 2011-09-08 | 2012-01-18 | 天津理工大学 | DSP based vector control system for variable-speed constant-frequency double-feed wind driven generator |
| CN202872726U (en) * | 2012-11-20 | 2013-04-10 | 湖南沃森电气科技有限公司 | Direct torque control traction variable-frequency speed regulator |
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2013
- 2013-07-12 CN CN2013102930119A patent/CN103368489A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201197132Y (en) * | 2008-02-04 | 2009-02-18 | 深圳市陆地方舟电动车有限公司 | Vector control AC variable-frequency control system of electric car |
| JP2011252818A (en) * | 2010-06-03 | 2011-12-15 | On Semiconductor Trading Ltd | Hall element control circuit |
| CN102324888A (en) * | 2011-09-08 | 2012-01-18 | 天津理工大学 | DSP based vector control system for variable-speed constant-frequency double-feed wind driven generator |
| CN202872726U (en) * | 2012-11-20 | 2013-04-10 | 湖南沃森电气科技有限公司 | Direct torque control traction variable-frequency speed regulator |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103986377A (en) * | 2014-06-04 | 2014-08-13 | 国家电网公司 | Direct-current brushless motor control method |
| CN110890851A (en) * | 2019-12-06 | 2020-03-17 | 湖南力诚新能源科技有限公司 | Motor control circuit of electric engineering machinery |
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Application publication date: 20131023 |