CN105118360A - Modern power electronic technique experiment platform and method - Google Patents
Modern power electronic technique experiment platform and method Download PDFInfo
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- CN105118360A CN105118360A CN201510336425.4A CN201510336425A CN105118360A CN 105118360 A CN105118360 A CN 105118360A CN 201510336425 A CN201510336425 A CN 201510336425A CN 105118360 A CN105118360 A CN 105118360A
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Abstract
The invention relates to an automatic experiment device for a power system, and the device comprises a generator set, a power transmission experiment apparatus, a control system, and an Ethernet communication system. The generator set consists of a DC motor and a three-phase AC generator, wherein the DC motor serves as an input power source of the three-phase AC generator. The power transmission experiment apparatus comprises a generator bus, an instrument group PV2, an instrument group PA2, an instrument group PV3, an electric reactor XL1, an electric reactor XL2, an electric reactor XL3, an electric reactor XL4, an infinite bus, an infinite power supply, and a load resistor box. The control system consists of a speed regulation control system, a microcomputer excitation system, and a quasi-synchronization control system, wherein the speed regulation control system, the microcomputer excitation system and the quasi-synchronization control system are respectively connected with a three-phase AC generator. The platform can achieve the automation of detection, control, monitoring, protection and scheduling of the power system, and prompts the development of electric power automation teaching and electric engineering science to great extent.
Description
Technical field
The invention belongs to modern power electronics technology, DSP control technology, based on Model design technique and virtual instrument technique field, be a kind of Platform of Experimental Teaching of modern power electronics technology and numerically controlled experimental technique, be suitable for the research Power Electronic Experimentation demand of universities and colleges of undergraduate course higher grade pupil, postgraduate etc.
Background technology
Power Electronic Technique is the subject utilizing power electronic devices to control electric energy and change, and is the cross discipline between electric power, electronics, the large electrical engineering technical field of control three.That the eighties latter stage in last century and the nineties initial stage grow up, that be representative with power MOSFET and IGBT, to integrate high frequency, high pressure and big current power semiconductor device, shows that Power Electronic Technique has entered the modern power electronic epoch.At present, in all energy, electric power energy accounts for 40%, and have in electric power energy 40% be through power electronic equipment conversion, estimate that 80% after 10 years in electric power energy will through the conversion of power electronic equipment, modern power electronics technology will play greater role in 21 century.
Traditional Course of Power Electronic Technology take controllable silicon as power conversion apparatus, and along with development and the application popularization of MOSFET and IGBT device, Course of Power Electronic Technology content also changes thereupon.Particularly each universities and colleges of undergraduate course add the content of courses of a large amount of modern power electronics technologies in recent years, and modern power electronics technology is set to Key curriculum at graduate student education by some universities and colleges in the works, and the importance of Power Electronic Technique increases day by day.
Compare the development of Power Electronic Technique curricula, the content of experiments teaching relatively lags behind.The content of current undergraduate education experimental teaching accounts for significant proportion substantially or with controllable silicon experiment, and the experiment content of modern power electronics technology is based on apportion element and special IC.
Modern power electronics technology mainly comprises rectification circuit, DC chopper circuit, inverter circuit, AC voltage adjusting and frequency changer circuit, and control mode is based on width modulation (PWM), and pulse width modulation frequency is usually more than tens kilo hertzs.
Due to the complicacy of Power Electronic Circuit, conventional controller (as apportion element or special IC) does not often reach desirable control effects.When adopting microprocessor to control, due to the rapidity of Power Electronic Circuit, very high requirement is proposed to the response speed of microprocessor.
In current colleges and universities in existing modern power electronics technology experimental provision, there is employing digital signal processor (DSP) as the experimental circuit of controller.Its control algolithm is developed by the manufacturer of experimental provision, be directly fixed in processor to have suffered, student can only observe the control effects of algorithm, cannot start design con-trol algorithm carry out experimental verification by real system, controller is equivalent to a black box concerning student, cause difficulty to the understanding of student, be unfavorable for the cultivation utilization of creative ability for students.
Also university R&D is had based on the power electronic control system experimental provision of semi-true object emulation technology, adopt multifunctional data acquisition card as AD/DA interface, the break-make that PWM waveform controls power device is produced by KA3525 integrated circuit, achieve control algolithm open to student, student can designed, designed control algolithm access control effect.Because it can only produce a road PWM waveform, the requirement of most of modern power electronic experiment can not be met; And due to its circuit structure, the PWM waveform with external clocking signals and the PWM waveform that multichannel is synchronous in sequential cannot be produced, to modern power electronics technology experiment, there is significant limitation.
Summary of the invention
The present invention proposes a kind of digital modern power electronics technology experiment porch and experimental technique, all model experiment contents of modern power electronics technology course rectification circuit, DC chopper circuit, inverter circuit, AC voltage adjusting and frequency changer circuit aspect can be contained, the experimental teaching requirement of undergraduate education or postgraduate's modern power electronics technology course can be met.The present invention take all-digitized demodulator as laboratory facilities, adopt the experimental technique based on modelling to make student can understand control algolithm and various signal change procedure intuitively, adopt digital signal processor TMS320F2812 can meet the quick response requirement of modern power electronic circuit and the requirement of multi-channel PWM signal synchronous coordination as controller.
For achieving the above object, the invention provides following technical scheme:
A kind of modern power electronics technology experiment porch, it comprises public system platform, DC chopped-wave and soft switch circuit, single-end ortho-exciting/flyback and single-phase APFC rectification circuit, single three-phase controlled rectifier circuit, single three-phase inversion and variable-frequency motor control circuit, host computer;
Described public system platform is made up of three-phase alternating-current supply, load, alternating current-direct current instrument, low-voltage dc power supply;
Described DC chopped-wave and soft switch circuit, single-end ortho-exciting/flyback and single-phase APFC rectification circuit, single three-phase controlled rectifier circuit, single three-phase inversion and variable-frequency motor control circuit comprise DSP core board TMS320F2812 and corresponding experimental circuit respectively, each experimental circuit connects public system platform, each experimental circuit exports through voltage and current signal buffer circuit connection data Acquisition Circuit, the signal of data acquisition circuit is after core board process, and control signal is input in experimental circuit through pwm signal output circuit, pwm signal isolated drive circuit successively; Each DSP core board connects host computer through communication module.
TMS320F2812 core board of the present invention is DSP core board, plate includes TMS320F2812 processor, jtag interface, RAM chip, On-off signal output interface, analog input interface, pwm signal output interface, 232 communication interfaces, 485 communication interfaces and usb communication interface.
Preferably, described single three-phase inversion and the experimental circuit of variable-frequency motor control circuit comprise rectification circuit, controlled full bridge inverter, load inductance and voltage and current detection circuit, the input end of rectification circuit is connected with the three-phase alternating-current supply of public system platform, the output terminal of rectification circuit is connected with controlled full bridge inverter, pwm signal isolated drive circuit connects controlled full bridge inverter, and voltage and current detection circuit is connected with controlled full bridge inverter and voltage and current signal buffer circuit respectively.
Preferably, described DC chopped-wave and soft switch circuit comprise:
System protection module, for realizing overvoltage protection, overcurrent protection, under-voltage protection, overload protection and dead zone protection, makes system works safer and stable;
DC chopped-wave control module, for detecting electric current and voltage, generates control signal switching waveform;
Sofe Switch control module, realizes the measurement of voltage, electric current by AD converter, analyze detection signal and calculate current control pulsewidth initial position and width, utilize pid algorithm to realize the closed loop adjustment of output voltage;
Measure voltage & current module, adopts timer triggered interrupts sampling measured signal, and calculates current voltage, electric current and realtime power data, by one order inertia wave filter filtering interference signals, obtain stable measured value;
Usb communication module, makes to carry out interaction data by the mode of high speed interrupt between core board and host computer;
Human-computer interface module, for selection function and down pass control command and display voltage, electric current, power data, real-time waveform collection, preserves data, recovers and analyzes.
Preferably, described single-end ortho-exciting/flyback and single-phase APFC rectification circuit comprise:
System protection module, for realizing overvoltage protection, under-voltage protection, overcurrent protection, dead band time delay, soft start, overload protection;
Single-ended positive/negative sharp module, starts soft-start module according to given magnitude of voltage, detects the value of feedback of current voltage, current voltage is controlled by PID controller, realize closed loop voltage to control, adopt the maximum output current of the restriction system of Current cut-off negative feedback simultaneously, prevent system overload from damaging;
APFC rectification module, judged by the phase place of the output current and system power supply that detect current rectification circuit, open the dutycycle of rectified power pipe, make the commutated current of system close to sine value, be improved the power factor of rectification circuit, realize the function of green power supply;
Data acquisition module, adopts timer triggered interrupts sampling measured signal, and calculates current voltage, current data, by one order inertia wave filter filtering interference signals, obtain stable measured value;
Usb communication module, makes to carry out interaction data by the mode of high speed interrupt between core board and host computer;
Human-computer interface module, for selection function with pass down control command and data such as display voltage, electric current, power etc., real-time waveform collection, preserves data, recovers and analyzes.
Preferably, described single three-phase controlled rectifier circuit comprises:
System protection module, for realizing overvoltage protection, overcurrent protection, under-voltage protection, overload protection and dead zone protection, makes system works safer and stable;
Single-phase controllable rectifier module, by detecting the phase place of single phase alternating current power supply, determines the initial time of gating pulse, by Setting signal with detect voltage compare the width determining pulse, the size of control commutating voltage;
Three-phase controlled rectification module, by detecting the phase place of three-phase alternating-current supply, determines the initial time of gating pulse, by Setting signal with detect voltage compare the width determining pulse, the size of control commutating voltage;
Measure voltage & current module, adopts timer triggered interrupts sampling measured signal, and calculates current voltage, electric current and realtime power data; By one order inertia wave filter filtering interference signals, obtain stable measured value;
Usb communication module, makes to carry out interaction data by the mode of high speed interrupt between core board and host computer;
Human-computer interface module, for selection function with pass down control command and data such as display voltage, electric current, power etc., real-time waveform collection, preserves data, recovers and analyzes.
Preferably, described single three-phase inversion and variable-frequency motor control circuit comprise:
System protection module, for realizing overspeed protection, under-voltage protection, overvoltage protection, overcurrent protection and dead zone protection, makes system works safer and stable;
Single three-phase inversion module, produces single Three-phase SPWM inverter control signal by EVA module, drives four and six IGBT power tubes respectively, is realized the stability contorting of voltage simultaneously by pid control module;
AC Motor Control module, DSP core board is passed to by under the control algolithm of alternating current generator SPWM, SVPWM, space vector, field orientation, realized the formation of SPWM control signal by the EVA module of DSP, reached the rotational speed regulation of asynchronous machine by the form of two close cycles;
DC MOTOR CONTROL module, realizes the measurement of voltage, electric current, rotating speed by AD converter, analyze detection signal and calculate current control pulsewidth initial position and width, utilize Neural network PID algorithm realization rotating speed, current PI D parameter adaptive to regulate.
Usb communication module, makes to carry out interaction data by the mode of high speed interrupt between core board and host computer;
Human-computer interface module, for selection function with pass down control command and data such as display voltage, electric current, rotating speed etc., in real time display SPWM waveform and sinusoidal voltage, the current signal of motor, data are preserved, recover and print.
A kind of modern power electronics technology experimental technique, comprises the steps:
(1) under MATLAB/Simulink software environment, the control software design of DSP core board TMS320F2812 is write by graphical programming software, comprise control algolithm, IO interface program and monitor-interface program etc., the Simulink system model that this control software design is a clear in structure, each functions of modules is clear and definite;
(2) by the automatic Code Generation under Simulink, Simulink model is compiled into CCS project, control program is converted to C program in machine code;
(3) this C program in machine code is carried out compiling under CCS environment and generate HEX file, download in DSP core board TMS320F2812;
(4) adopt DSP core board to build DC chopped-wave and soft switch circuit, single-end ortho-exciting/flyback and single-phase APFC rectification circuit, single three-phase controlled rectifier circuit, single three-phase inversion and variable-frequency motor control circuit, carry out experiments in conjunction with public system platform and host computer.
The present invention is directed to the deficiency of existing experiments equipment, propose digitizing modern power electronics technology experiment porch and the experimental technique of complete set, adopt the means based on Model design technique, instead of C language programming mode with the patterned programmed method of Simulink.This modular hardware cell and software module, be not only convenient to principle and process that student understands experiment, and student more can be allowed to carry out the exploring experiments of Advanced Control Strategies research.The present invention is applicable to institution of higher learning undergraduate, the related experiment of postgraduate's modern power electronics technology course and Course Exercise, also may be used for institution of higher learning, plan-validation that scientific research institutions carry out modern power electronic circuit, prototype exploitation and control strategy optimization.
Accompanying drawing explanation
Fig. 1 is modern power electronics technology experiment table structural plan of the present invention;
Fig. 2 is modern power electronics technology experimental principle structural representation of the present invention;
Fig. 3 is voltage and current signal buffer circuit schematic diagram of the present invention;
Fig. 4 is pwm signal buffer circuit schematic diagram of the present invention;
Fig. 5 is Sofe Switch experiment control program Simulink prototype software of the present invention;
Fig. 6 is the present invention's single-phase APFC experiment control program Simulink prototype software;
Fig. 7 is the present invention's single-phase controlled rectification experiment control program Simulink prototype software;
Fig. 8 is three-phase controlled rectification experiment control program Simulink prototype software of the present invention;
Fig. 9 is single-phase inversion experiment control program Simulink prototype software of the present invention;
Figure 10 is three-phase inversion experiment control program Simulink prototype software of the present invention;
Figure 11 is variable-frequency motor Control release control program Simulink prototype software of the present invention;
Figure 12 is DC brushless motor experiment control program Simulink prototype software of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
With reference to Fig. 1, a kind of modern power electronics technology experiment porch, it comprises public system platform, DC chopped-wave and soft switch circuit, single-end ortho-exciting/flyback and single-phase APFC rectification circuit, single three-phase controlled rectifier circuit, single three-phase inversion and variable-frequency motor control circuit, host computer;
Described public system platform is made up of three-phase alternating-current supply, load, alternating current-direct current instrument, low-voltage dc power supply;
Described DC chopped-wave and soft switch circuit, single-end ortho-exciting/flyback and single-phase APFC rectification circuit, single three-phase controlled rectifier circuit, single three-phase inversion and variable-frequency motor control circuit comprise DSP core board TMS320F2812 and corresponding experimental circuit respectively, each experimental circuit connects public system platform, each experimental circuit exports through voltage and current signal buffer circuit connection data Acquisition Circuit, the signal of data acquisition circuit is after core board process, and control signal is input in experimental circuit through pwm signal output circuit, pwm signal isolated drive circuit successively; Each DSP core board connects host computer through communication module.
In Fig. 1, each device/circuit of the present invention is placed on shaped experiment table, successively so that experimental implementation.
Described single three-phase inversion and the experimental circuit of variable-frequency motor control circuit comprise rectification circuit, controlled full bridge inverter, load inductance and voltage and current detection circuit, the input end of rectification circuit is connected with the three-phase alternating-current supply of public system platform, the output terminal of rectification circuit is connected with controlled full bridge inverter, pwm signal isolated drive circuit connects controlled full bridge inverter, and voltage and current detection circuit is connected with controlled full bridge inverter and voltage and current signal buffer circuit respectively.Three-phase alternating-current supply rectification after rectification circuit of public system platform is high-voltage DC power supply, and the power supply as controlled full bridge inverter (IPM) inputs.The DSP control system be made up of TMS320F2812 core board exports 6 road pwm signals, as the control signal of controlled full bridge inverter (IPM) after pwm signal isolated drive circuit.Pwm voltage output voltage and all adjustable AC power of frequency after the filtering of load inductance lc circuit that controlled full bridge inverter exports.The voltage of the AC power in simultaneity factor after the voltage and current amount of DC side and inversion and the magnitude of current after voltage and current detection circuit, voltage and current signal buffer circuit receive by data acquisition circuit.
Described DC chopped-wave and soft switch circuit comprise:
System protection module, for realizing overvoltage protection, overcurrent protection, under-voltage protection, overload protection and dead zone protection, makes system works safer and stable;
DC chopped-wave control module, for detecting electric current and voltage, generates control signal switching waveform;
Sofe Switch control module, realizes the measurement of voltage, electric current by AD converter, analyze detection signal and calculate current control pulsewidth initial position and width, utilize pid algorithm to realize the closed loop adjustment of output voltage;
Measure voltage & current module, adopts timer triggered interrupts sampling measured signal, and calculates current voltage, electric current and realtime power data, by one order inertia wave filter filtering interference signals, obtain stable measured value;
Usb communication module, makes to carry out interaction data by the mode of high speed interrupt between core board and host computer;
Human-computer interface module, for selection function and down pass control command and display voltage, electric current, power data, real-time waveform collection, preserves data, recovers and analyzes.
Described single-end ortho-exciting/flyback and single-phase APFC rectification circuit comprise:
System protection module, for realizing overvoltage protection, under-voltage protection, overcurrent protection, dead band time delay, soft start, overload protection;
Single-ended positive/negative sharp module, starts soft-start module according to given magnitude of voltage, detects the value of feedback of current voltage, current voltage is controlled by PID controller, realize closed loop voltage to control, adopt the maximum output current of the restriction system of Current cut-off negative feedback simultaneously, prevent system overload from damaging;
APFC rectification module, judged by the phase place of the output current and system power supply that detect current rectification circuit, open the dutycycle of rectified power pipe, make the commutated current of system close to sine value, be improved the power factor of rectification circuit, realize the function of green power supply;
Data acquisition module, adopts timer triggered interrupts sampling measured signal, and calculates current voltage, current data, by one order inertia wave filter filtering interference signals, obtain stable measured value;
Usb communication module, makes to carry out interaction data by the mode of high speed interrupt between core board and host computer;
Human-computer interface module, for selection function with pass down control command and data such as display voltage, electric current, power etc., real-time waveform collection, preserves data, recovers and analyzes.
Described single three-phase controlled rectifier circuit comprises:
System protection module, for realizing overvoltage protection, overcurrent protection, under-voltage protection, overload protection and dead zone protection, makes system works safer and stable;
Single-phase controllable rectifier module, by detecting the phase place of single phase alternating current power supply, determines the initial time of gating pulse, by Setting signal with detect voltage compare the width determining pulse, the size of control commutating voltage.
Three-phase controlled rectification module, by detecting the phase place of three-phase alternating-current supply, determines the initial time of gating pulse, by Setting signal with detect voltage compare the width determining pulse, the size of control commutating voltage.
Measure voltage & current module, adopts timer triggered interrupts sampling measured signal, and calculates current voltage, electric current and realtime power data; By one order inertia wave filter filtering interference signals, obtain stable measured value.
Usb communication module, makes to carry out interaction data by the mode of high speed interrupt between core board and host computer;
Human-computer interface module, for selection function with pass down control command and data such as display voltage, electric current, power etc., real-time waveform collection, preserves data, recovers and analyzes.
Described single three-phase inversion and variable-frequency motor control circuit comprise:
System protection module, for realizing overspeed protection, under-voltage protection, overvoltage protection, overcurrent protection and dead zone protection, makes system works safer and stable;
Single three-phase inversion module, produces single Three-phase SPWM inverter control signal by EVA module, drives four and six IGBT power tubes respectively, is realized the stability contorting of voltage simultaneously by pid control module;
AC Motor Control module, DSP core board is passed to by under the control algolithm of alternating current generator SPWM, SVPWM, space vector, field orientation, realized the formation of SPWM control signal by the EVA module of DSP, reached the rotational speed regulation of asynchronous machine by the form of two close cycles;
DC MOTOR CONTROL module, realizes the measurement of voltage, electric current, rotating speed by AD converter, analyze detection signal and calculate current control pulsewidth initial position and width, utilize Neural network PID algorithm realization rotating speed, current PI D parameter adaptive to regulate.
Usb communication module, makes to carry out interaction data by the mode of high speed interrupt between core board and host computer;
Human-computer interface module, for selection function with pass down control command and data such as display voltage, electric current, rotating speed etc., in real time display SPWM waveform and sinusoidal voltage, the current signal of motor, data are preserved, recover and print.
A kind of modern power electronics technology experimental technique, comprises the steps:
(1) under MATLAB/Simulink software environment, the control software design of DSP core board TMS320F2812 is write by graphical programming software, comprise control algolithm, IO interface program and monitor-interface program etc., the Simulink system model that this control software design is a clear in structure, each functions of modules is clear and definite;
(2) by the automatic Code Generation under Simulink, Simulink model is compiled into CCS project, control program is converted to C program in machine code;
(3) this C program in machine code is carried out compiling under CCS environment and generate HEX file, download in DSP core board TMS320F2812;
(4) adopt DSP core board to build DC chopped-wave and soft switch circuit, single-end ortho-exciting/flyback and single-phase APFC rectification circuit, single three-phase controlled rectifier circuit, single three-phase inversion and variable-frequency motor control circuit, carry out experiments in conjunction with public system platform and host computer.
With reference to Fig. 2, in PC 1, utilize Simulink model programming software, build the control software design of three-phase inverting circuit experiment, the control module of the unit such as the closed loop controller module of inverter circuit and AD, EVA, PIE, SCI, GPIO of dsp processor TMS320F2812 is comprised, as shown in Figure 10 (other experiment can refer to Fig. 5-9,11-12) in control software design.By the automatic Code Generation under Simulink, Simulink model is compiled into the item file under Texas Instruments (TI) microprocessor Integrated Development Environment (CCS), now control program has been converted to C program in machine code.This C program in machine code is carried out compiling under CCS environment and generate HEX file, downloaded to the development namely completing control software design in TMS320F2812 microprocessor by jtag interface.In this software development process, student does not need to write or check complicated C programmer, only needing to carry out building of functional module under Simulink environment just passable, not only easy but also easy understand, is that a kind of applicable learning phase student carries out confirmatory and programming mode that is Research experiment.When carrying out Research experiment, student only needs change adjustor module just can carry out new control strategy and have studied, and other module can not change.
With emulator, control program is downloaded to TMS320F2812 core board 4 from JTAG mouth, start microprocessor TMS320F2812 after resetting and run control program.Task manager EVA in microprocessor TMS320F2812 produces pwm signal and exports to pwm signal isolated drive circuit 9 through pwm signal output circuit 6, and output can control the gate pole control signal of IGBT pipe in controlled full bridge inverter (i.e. experimental circuit) (IPM) 8.Each electric current and voltage amount in controlled full bridge inverter 8 in experimentation exports to voltage and current signal buffer circuit 7 by testing circuit, after strong and weak electricity isolation, output to data acquisition circuit 5, fed back in control program by the A/D convertor circuit in microprocessor TMS320F2812 and carry out closed-loop control.And the various feedback parameter that TMS320F2812 core board 4 produces in control program operational process and required controling parameters carry out real-time exchange by the virtual instrument monitoring software 3 in USB interface and PC 1, student can observe the various operational factors in inverter circuit experimentation on virtual instrument monitoring software, because can in monitoring software change control parameter, observe the experiment effect under different controling parameters.
Voltage and current signal buffer circuit of the present invention as shown in Figure 3.Ac and dc current signal isolation circuit receives the output signal IF1 of Hall current sensor, because Hall current sensor is when detection electric current is 0A, output voltage is 2.5V, so added a negative sense bias direct current voltage at the input stage amplifier U2A of this circuit, regulated by RP2 potentiometer, the gain of potentiometer RP1 adjustable circuit.U2B, IC1, U3A are analog quantity linear optical coupling buffer circuit, can carry out isolation transmission, added stabilivolt WD1, made output voltage amplitude be limited between 0-3.3V, mate with the simulating signal input range of TMS320F2812 at the output terminal of U3A analog quantity.
D. c. voltage signal buffer circuit receives the voltage division signal UF1 of high-voltage dc voltage, because UF1 is a unipolar signal, does not therefore need to be biased signal, the gain of potentiometer RP3 regulating circuit.U4B, IC2, U5A are analog quantity linear optical coupling buffer circuit, and principle of work is the same.
Ac voltage signal buffer circuit receives ac voltage signal by voltage transformer (VT) T1, superposition direct current biasing amount (9V1 is superposed by R30), at U7A output single-pole ac voltage signal, U7B, IC3, U8A are analog quantity linear optical coupling buffer circuit, and principle of work is the same.
Pwm signal isolated drive circuit of the present invention as shown in Figure 4, the 6 road pwm signals produced by CPU on TMS320F2812 core board export, pwm signal buffer circuit is input to, by high speed photo coupling to 6 IGBT device that can drive full bridge inverter (IPM) after 6 road pwm signal isolation after gate circuit drives.
The modern power electronics technology experimental project that the present invention can carry out has:
1, buck circuit (BuckChopper) performance study;
2, boost chopper (BoostChopper) performance study;
3, lifting/voltage reducing chopper circuit (Buck-BoostChopper) performance study;
4, Cuk chopper circuit performance study;
5, Sepic chopper circuit performance study;
6, Zeta chopper circuit performance study;
7, phase-shifting full-bridge zero voltage switch translation circuit (soft switch circuit) research experiment.
The modern power electronics technology experimental project that single-end ortho-exciting/flyback of the present invention and single-phase APFC rectification circuit can carry out has:
1, single-end ortho-exciting Switching Power Supply experimental study;
2, single-ended reverse exciting switching voltage regulator experimental study;
3, single phase boost type APFC rectification circuit experimental study.
The modern power electronics technology experimental project that list three-phase controlled rectifier circuit of the present invention can carry out has:
1, voltage-type single-phase full bridge formula rectification circuit pressure regulation experiment;
2, voltage-type single-phase full bridge formula rectification circuit inversion experiment;
3, voltage-type three-phase bridge rectifier circuit pressure regulation experiment;
4, voltage-type three-phase bridge rectifier circuit inversion experiment.
The modern power electronics technology experimental project that list three-phase inversion of the present invention and variable-frequency motor control circuit can carry out has:
1, Single-phase SPWM ac converter experimental study;
2, Three-phase SPWM ac converter experimental study;
3, AC induction motor frequency control experiment;
4, direct current generator pulse wide modulation experiment (rotating speed, current double closed-loop FEEDBACK CONTROL);
5, square wave brushless electric machine speed regulation experiment (PI, PID, FUZZY, FUZZY-PID control).
When carrying out DC chopper circuit experiment, adjustable PWM ripple is produced to control the operation of DC chopper circuit by DSP core board, electric current and voltage value simultaneously in DSP core board Real-time Collection DC chopper circuit, shows waveform and the parameter of DC chopper circuit in real time in experiment monitoring software.Phase-shifting full-bridge zero voltage switch translation circuit (soft switch circuit) is made up of the part such as H-bridge circuit and load circuit, and the control signal of H bridge is produced by DSP core board.The magnitude of voltage that DSP core board sets according to host computer or dutycycle and other operational factor, produce the H bridge pwm control signal needed for soft switch circuit, and the electric current and voltage value gathered in soft switch circuit, in experiment monitoring software, show waveform and the parameter of soft switch circuit in real time.
When carrying out single-end ortho-exciting/reverse exciting switching voltage regulator experiment, DSP core board produces the pwm signal of switch power supply power tube, and gathering the output voltage values of Switching Power Supply, the constant voltage realizing Switching Power Supply exports, simultaneously the operational factor of real-time display switch power supply in experiment monitoring software.
When carrying out the experiment of single-phase APFC rectification circuit, DSP core board gathers alternating voltage and the current signal of rectification circuit input and exports d. c. voltage signal, controls the pwm signal of power tube, complete the normal work of single-phase APFC rectification circuit after computing.And in experiment monitoring software, realize the setting of controling parameters and the display of real-time parameter.
When carrying out the experiment of single three-phase controlled rectifier circuit, the DC voltage of the alternating voltage that DSP core board Real-time Collection rectification circuit inputs and current signal and output and current signal, according to the controling parameters of host computer experimental control Software setting, export the pwm control signal of full bridge rectifier controllable devices, the rectification or the inverter mode that realize rectification circuit run.And in experiment monitoring software, carry out the display of real-time parameter.
When carrying out ac converter experiment, the alternating voltage that DSP core board Real-time Collection inverter circuit exports and current signal, according to the controling parameters of host computer experimental control Software setting, export the pwm control signal of full bridge inverter controllable devices, the AC power realizing inverter circuit is run.And in experiment monitoring software, carry out the display of real-time parameter.
When carrying out speed regulating control experiment, the rotating speed of DSP core board motor in real time or position signalling and current signal, according to the controling parameters of host computer experimental control Software setting, export the pwm control signal of full bridge inverter controllable devices, realize the closed-loop control of motor speed, and carry out the display of real-time parameter in experiment monitoring software.
The above is present pre-ferred embodiments, not in order to limit the present invention, all do in the spirit and principles in the present invention any amendment, equivalent to replace and within improvement etc. all should be included in the present invention.
Claims (7)
1. a modern power electronics technology experiment porch, is characterized in that: it comprises public system platform, DC chopped-wave and soft switch circuit, single-end ortho-exciting/flyback and single-phase APFC rectification circuit, single three-phase controlled rectifier circuit, single three-phase inversion and variable-frequency motor control circuit, host computer;
Described public system platform is made up of three-phase alternating-current supply, load, alternating current-direct current instrument, low-voltage dc power supply;
Described DC chopped-wave and soft switch circuit, single-end ortho-exciting/flyback and single-phase APFC rectification circuit, single three-phase controlled rectifier circuit, single three-phase inversion and variable-frequency motor control circuit comprise DSP core board TMS320F2812 and corresponding experimental circuit respectively, each experimental circuit connects public system platform, each experimental circuit exports through voltage and current signal buffer circuit connection data Acquisition Circuit, the signal of data acquisition circuit is after core board process, and control signal is input in experimental circuit through pwm signal output circuit, pwm signal isolated drive circuit successively; Each DSP core board connects host computer through communication module.
2. modern power electronics technology experiment porch according to claim 1, it is characterized in that: described single three-phase inversion and the experimental circuit of variable-frequency motor control circuit comprise rectification circuit, controlled full bridge inverter, load inductance and voltage and current detection circuit, the input end of rectification circuit is connected with the three-phase alternating-current supply of public system platform, the output terminal of rectification circuit is connected with controlled full bridge inverter, pwm signal isolated drive circuit connects controlled full bridge inverter, voltage and current detection circuit is connected with controlled full bridge inverter and voltage and current signal buffer circuit respectively.
3. modern power electronics technology experiment porch according to claim 1, is characterized in that: described DC chopped-wave and soft switch circuit comprise:
System protection module, for realizing overvoltage protection, overcurrent protection, under-voltage protection, overload protection and dead zone protection, makes system works safer and stable;
DC chopped-wave control module, for detecting electric current and voltage, generates control signal switching waveform;
Sofe Switch control module, realizes the measurement of voltage, electric current by AD converter, analyze detection signal and calculate current control pulsewidth initial position and width, utilize pid algorithm to realize the closed loop adjustment of output voltage;
Measure voltage & current module, adopts timer triggered interrupts sampling measured signal, and calculates current voltage, electric current and realtime power data, by one order inertia wave filter filtering interference signals, obtain stable measured value;
Usb communication module, makes to carry out interaction data by the mode of high speed interrupt between core board and host computer;
Human-computer interface module, for selection function and down pass control command and display voltage, electric current, power data, real-time waveform collection, preserves data, recovers and analyzes.
4. modern power electronics technology experiment porch according to claim 1, is characterized in that: described single-end ortho-exciting/flyback and single-phase APFC rectification circuit comprise:
System protection module, for realizing overvoltage protection, under-voltage protection, overcurrent protection, dead band time delay, soft start, overload protection;
Single-ended positive/negative sharp module, starts soft-start module according to given magnitude of voltage, detects the value of feedback of current voltage, current voltage is controlled by PID controller, realize closed loop voltage to control, adopt the maximum output current of the restriction system of Current cut-off negative feedback simultaneously, prevent system overload from damaging;
APFC rectification module, judged by the phase place of the output current and system power supply that detect current rectification circuit, open the dutycycle of rectified power pipe, make the commutated current of system close to sine value, be improved the power factor of rectification circuit, realize the function of green power supply;
Data acquisition module, adopts timer triggered interrupts sampling measured signal, and calculates current voltage, current data, by one order inertia wave filter filtering interference signals, obtain stable measured value;
Usb communication module, makes to carry out interaction data by the mode of high speed interrupt between core board and host computer;
Human-computer interface module, for selection function with pass down control command and data such as display voltage, electric current, power etc., real-time waveform collection, preserves data, recovers and analyzes.
5. modern power electronics technology experiment porch according to claim 1, is characterized in that: described single three-phase controlled rectifier circuit comprises:
System protection module, for realizing overvoltage protection, overcurrent protection, under-voltage protection, overload protection and dead zone protection, makes system works safer and stable;
Single-phase controllable rectifier module, by detecting the phase place of single phase alternating current power supply, determines the initial time of gating pulse, by Setting signal with detect voltage compare the width determining pulse, the size of control commutating voltage;
Three-phase controlled rectification module, by detecting the phase place of three-phase alternating-current supply, determines the initial time of gating pulse, by Setting signal with detect voltage compare the width determining pulse, the size of control commutating voltage;
Measure voltage & current module, adopts timer triggered interrupts sampling measured signal, and calculates current voltage, electric current and realtime power data; By one order inertia wave filter filtering interference signals, obtain stable measured value;
Usb communication module, makes to carry out interaction data by the mode of high speed interrupt between core board and host computer;
Human-computer interface module, for selection function with pass down control command and data such as display voltage, electric current, power etc., real-time waveform collection, preserves data, recovers and analyzes.
6. modern power electronics technology experiment porch according to claim 1, is characterized in that: described single three-phase inversion and variable-frequency motor control circuit comprise:
System protection module, for realizing overspeed protection, under-voltage protection, overvoltage protection, overcurrent protection and dead zone protection, makes system works safer and stable;
Single three-phase inversion module, produces single Three-phase SPWM inverter control signal by EVA module, drives four and six IGBT power tubes respectively, is realized the stability contorting of voltage simultaneously by pid control module;
AC Motor Control module, DSP core board is passed to by under the control algolithm of alternating current generator SPWM, SVPWM, space vector, field orientation, realized the formation of SPWM control signal by the EVA module of DSP, reached the rotational speed regulation of asynchronous machine by the form of two close cycles;
DC MOTOR CONTROL module, realizes the measurement of voltage, electric current, rotating speed by AD converter, analyze detection signal and calculate current control pulsewidth initial position and width, utilize Neural network PID algorithm realization rotating speed, current PI D parameter adaptive to regulate;
Usb communication module, makes to carry out interaction data by the mode of high speed interrupt between core board and host computer;
Human-computer interface module, for selection function with pass down control command and data such as display voltage, electric current, rotating speed etc., in real time display SPWM waveform and sinusoidal voltage, the current signal of motor, data are preserved, recover and print.
7. a modern power electronics technology experimental technique, is characterized in that comprising the steps:
(1) under MATLAB/Simulink software environment, the control software design of DSP core board TMS320F2812 is write by graphical programming software, comprise control algolithm, IO interface program and monitor-interface program etc., the Simulink system model that this control software design is a clear in structure, each functions of modules is clear and definite;
(2) by the automatic Code Generation under Simulink, Simulink model is compiled into CCS project, control program is converted to C program in machine code;
(3) this C program in machine code is carried out compiling under CCS environment and generate HEX file, download in DSP core board TMS320F2812;
(4) adopt DSP core board to build DC chopped-wave and soft switch circuit, single-end ortho-exciting/flyback and single-phase APFC rectification circuit, single three-phase controlled rectifier circuit, single three-phase inversion and variable-frequency motor control circuit, carry out experiments in conjunction with public system platform and host computer.
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