CN105245126A - Teaching inverter system module - Google Patents
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- CN105245126A CN105245126A CN201510691401.0A CN201510691401A CN105245126A CN 105245126 A CN105245126 A CN 105245126A CN 201510691401 A CN201510691401 A CN 201510691401A CN 105245126 A CN105245126 A CN 105245126A
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Abstract
The invention belongs to the technical field of electronics, and in particular relates to a novel teaching inverter system module which comprises a main controller, a direct current contactor, an IPM inverter, a filter circuit, an isolation transformer, a direct current contactor drive, a voltage and current sampling circuit I, a conditioning circuit I, an IPM drive circuit, a protection logic circuit, a voltage and current sampling circuit II, a conditioning circuit II, an A/D converter, an alternating current contactor and an alternating current contactor drive. According to the invention, the inverter system which can work in a variety of modes is a part of a micro-grid experiment platform, can transmit the power of the experiment platform to a power grid, and can transmit the power of the power grid to the micro-grid experiment platform in a PWM rectifier manner to power other electric devices; the teaching inverter system module is used as a voltage regulator in a direct current micro-grid system; and a direct current micro-grid can be used as a backup power supply of the power grid to power an important load when a power system is failed.
Description
Technical field
The invention belongs to electronic technology field, be specifically related to a kind of new teaching inversion system module.
Background technology
Microgrid is an importance of intelligent grid development, shows and teach the microgrid knowledge be made up of the device such as photovoltaic, wind power generation to university student, plays vital effect to the intelligent grid development of promotion China.The microgrid experiment porch that comprise the devices such as photovoltaic, wind power generation, energy storage of development for imparting knowledge to students, has extremely effective popularizing action to distributed power source and intelligent grid.
Microgrid experiment porch mainly comprises solar power generation, wind power generation, energy storage, single-phase frequency conversion inversion, three-phase grid inversion, DC motor Driver, DC load etc.Want to make various piece composition microgrid in experiment porch, run in a system simultaneously, need photovoltaic, blower fan, storage battery etc. to be connected on a unified bus.Mainly contain AC and DC two kinds of bus types at present.Ac bus and traditional electrical network are more pressed close to, when ensureing that this busbar voltage, frequency, phase place are identical with electrical network, can be grid-connected, but need to utilize inverter that direct current is reverse into alternating current.DC bus is ac bus comparatively, relatively easy in control, and power and voltage control all can be summed up as DC bus-bar voltage and control, and adopts DC/DC circuit just the electric energy that new forms of energy in microgrid send can be incorporated on DC bus.Photovoltaic in microgrid experiment porch, storage battery, super capacitor etc. are once-through type device, adopt DC bus comparatively suitable.DC bus-bar voltage is chosen as 48V, mainly based on following 2 considerations:
(1), the test platform that learns as student research program of this experiment porch, safety time voltage exceedes that safe voltage is too high to be then difficult to ensure student experimenting.
(2), experiment porch power wants to reach 500W, and when DC bus-bar voltage is lower, direct current just will can reach rated power greatlyr, and this will increase the cost of experiment porch.Experiment porch adopts 48V DC bus standard, and maximum current can reach 20A.
For the characteristic and the converter circuit thereof that allow student get information about various new forms of energy, made a distinction in a modular fashion by each functional circuit, this experiment porch can be divided into following module: solar power generation module, wind power generation module, energy-storage module, single-phase inversion module, three-phase grid module and DC load module.
Solar power generation module utilizes DC/DC circuit to be transferred on DC bus by photovoltaic electric energy, and can utilize this DC/DC circuit realiration MPPT function.Blower fan sends three-phase alternating current, and by becoming direct current after rectifier bridge, and then the delivery of electrical energy utilizing DC/DC circuit to be sent by blower fan is on DC bus, and this module needs to realize MPPT function equally.Energy storage device mainly storage battery and the super capacitor of energy-storage module, the two can utilize DC/DC circuit of the same type, realizes energy-storage module and DC bus energy transferring.Three-phase inversion module, mainly converting direct current energy to threephase AC electric energy is sent in electrical network or threephase load, three phase network also can power on and be transferred on DC bus by PWM rectifier system, for direct-flow electricity utilization apparatus on experiment porch by this inversion module.Remaining power consumption equipment is many to be connected with DC bus by single-phase inversion module and DC/DC module.Experiment porch structure chart as shown in Figure 1.
In experiment porch shown in Fig. 1, solar power generation module, wind power generation module, energy-storage module and DC load module, three-phase inversion module all need MOSFET drive circuit, electric current and voltage sampling modulate circuit, master board etc.If each module independently arranges these circuit, both consuming time, be unfavorable for that again student understands each function in circuit.So be necessary by the function refinement in modules, the circuit realizing said function to be made module, by the modules shown in each functional module composition diagram 1; In order to can more be conducive to teaching and real training spy develop this teaching inversion system module.
Summary of the invention
The object of the present invention is to provide a kind of for direct current micro-grid system, the teaching inversion system module of the energy capable of bidirectional flowing under PWM rectification, parallel network reverse and independent inverter mode can be operated in.
To achieve these goals, the utility model adopts following technical scheme: teaching inversion system module, comprises master controller, D.C. contactor, IPM inverter, filter circuit, isolating transformer, D.C. contactor driving, electric current and voltage sample circuit I, modulate circuit I, IPM drive circuit, relay protective scheme circuit, electric current and voltage sample circuit II, modulate circuit II, A/D converter, A.C. contactor and A.C. contactor and drive, described IPM inverter is connected with DC bus by D.C. contactor, described D.C. contactor is driven by D.C. contactor and is connected with master controller, described IPM inverter is by after filter circuit and isolating transformer, be connected with load and electrical network respectively through after A.C. contactor, described A.C. contactor is driven by A.C. contactor and is connected with master controller, described IPM inverter is connected with master controller with relay protective scheme circuit by IPM drive circuit, electric current and voltage sample circuit I is connected between described D.C. contactor and IPM inverter, described electric current and voltage sample circuit I is connected to modulate circuit I, described modulate circuit I is connected respectively to relay protective scheme circuit and A/D converter, connect electric current and voltage between described filter circuit and isolating transformer to sample electric II, described electric current and voltage sample circuit II is connected to modulate circuit II, modulate circuit II is connected respectively to A/D converter and master controller, described A/D converter is connected with master controller.
Preferably, described master controller adopts model to be the dsp processor of TMS320F28335.
Preferably, described IPM inverter adopts IGBT device as switching device.
Preferably, described IPM inverter adopts model to be the IPM of PM50RLA120.
Preferably, described electric current and voltage sample circuit adopts voltage sensor and current sensor to carry out electric current and voltage sampling respectively.
Preferably, described voltage sensor and current sensor are Hall element, and described voltage sensor adopts TBV10/20 series Hall voltage transducer, and described current sensor adopts TBC-D series Hall current sensor.
Preferably, the model of described A/D converter is AD7606.
Preferably, described IPM drive circuit comprises photoelectrical coupler, and the model of described photoelectrical coupler is HCPL4504.
Preferably, described inversion system module also comprises LCD display, and described LCD display is connected with controller.
Preferably, described inversion system module also comprises keyboard, and described keyboard is connected with controller.
The inverter system be operated under various modes of the present invention, for a part for microgrid experiment porch, both the electric energy of experiment porch can be sent to electrical network, can electrical network electric energy be transported on microgrid experiment porch, for other power consumption equipments by PWM rectifier system again.This teaching inversion system module uses as voltage regulator in direct current micro-grid system, also using the backup battery of direct-current micro-grid as electrical network, when electric power system fault, can power to important load.
Accompanying drawing explanation
Fig. 1 is experiment porch structure chart;
Fig. 2 is teaching inversion system modular member structure chart;
Fig. 3 is Hall voltage sensor circuit figure;
Fig. 4 is Hall current sensor circuit diagram;
Fig. 5 is voltage follow and biasing circuit;
Fig. 6 is frequency detection circuit;
Fig. 7 is for comparing and circuits for triggering;
Fig. 8 is absolute value circuit;
Fig. 9 is relay protective scheme circuit diagram;
Figure 10 is IPM section driving circuit;
Figure 11 contactor drive circuit.
Embodiment
Below in conjunction with embodiment, the present invention is described in detail.
Teaching inversion system module, comprises master controller, D.C. contactor, IPM inverter, filter circuit, isolating transformer, D.C. contactor driving, electric current and voltage sample circuit I, modulate circuit I, IPM drive circuit, relay protective scheme circuit, electric current and voltage sample circuit II, modulate circuit II, A/D converter, A.C. contactor and A.C. contactor and drives, described IPM inverter is connected with DC bus by D.C. contactor, described D.C. contactor is driven by D.C. contactor and is connected with master controller, described IPM inverter is by after filter circuit and isolating transformer, be connected with load and electrical network respectively through after A.C. contactor, described A.C. contactor is driven by A.C. contactor and is connected with master controller, described IPM inverter is connected with master controller with relay protective scheme circuit by IPM drive circuit, electric current and voltage sample circuit I is connected between described D.C. contactor and IPM inverter, described electric current and voltage sample circuit I is connected to modulate circuit I, described modulate circuit I is connected respectively to relay protective scheme circuit and A/D converter, connect electric current and voltage between described filter circuit and isolating transformer to sample electric II, described electric current and voltage sample circuit II is connected to modulate circuit II, modulate circuit II is connected respectively to A/D converter and master controller, described A/D converter is connected with master controller.
Described master controller adopts model to be the dsp processor of TMS320F28335.
Described IPM inverter adopts IGBT device as switching device.
Described IPM inverter adopts model to be the IPM of PM50RLA120.
Described electric current and voltage sample circuit adopts voltage sensor and current sensor to carry out electric current and voltage sampling respectively.
Described voltage sensor and current sensor are Hall element, and described voltage sensor adopts TBV10/20 series Hall voltage transducer, and described current sensor adopts TBC-D series Hall current sensor.
The model of described A/D converter is AD7606.
Described IPM drive circuit comprises photoelectrical coupler, and the model of described photoelectrical coupler is HCPL4504.
Described inversion system module also comprises LCD display, and described LCD display is connected with controller.
Described inversion system module also comprises keyboard, and described keyboard is connected with controller.
This teaching inversion system module is a set of motherboard, and this motherboard adopts the assembling mode of plug, the voltage after master controller, conditioning and current signal, relay drive circuit, over-current over-voltage protection logical circuit is grouped together.Modules for the independent research learning of student, can have exemplary role.Be below by the design of DSP master board, electric current and voltage sampling and current foldback circuit design, IPM drive circuit design presentation.
Fig. 2 is teaching inversion system function structure chart, primarily of compositions such as DSP master board, D.C. contactor, IPM inverter, filter circuit, isolating transformer, D.C. contactor driving, electric current and voltage sample circuit, modulate circuit, IPM drive circuit, relay protective scheme circuit, A/D converter, A.C. contactor and A.C. contactor drivings.DC bus is connected with IPM inverter by D.C. contactor.IPM inverter, by after filter circuit and isolating transformer, is connected with load and electrical network respectively through after A.C. contactor.D.C. contactor, A.C. contactor control by DSP respectively, DSP export pwm signal by entering IPM drive circuit after relay protective scheme circuit, IPM drive circuit control IPM inverter.Voltage, current sensor is utilized to detect DC bus-bar voltage, the inflow electric current of inverter and the voltage on the former limit of isolating transformer and electric current respectively, subsequently by after modulate circuit, voltage, current signal are sent into A/D converter AD7606, frequency and phase information are sent into the CAP mouth of DSP, detect frequency and phase place for DSP.DSP is imported into by DSP data/address bus after AD7606 converts analog signal to digital signal.Utilize the electric current and voltage information detecting and obtain, and utilize special control algolithm that inverter just can be made to be operated in dbjective state by our requirement.Be below main devices and the function of teaching inverter system module.
1, inverter switch device
This teaching inversion system module selects three phase full bridge topological structure, needs employing 6 electronic power switch devices to form full bridge structure.Comparatively conventional power electronic device has thyristor, power transistor, IGBT, MOSFET etc.Thyristor can work under high voltage, big current condition, belongs to half control type device, only when turning off triggering signal and thyristor current flows is zero, just can close, not being suitable for bipolarity PWM algorithm.Power transistor is withstand voltage height, electric current is large, switching characteristic good, but drive circuit is complicated, require that driving power is comparatively large, and driving power is directly proportional to the electric current flowing through device.The compound full-control type voltage driven type power semiconductor that IGBT is made up of BJT (double pole triode) and MOS (insulating gate type field effect tube), has the advantage of the high input impedance of MOSFET and low conduction voltage drop two aspect of GTR concurrently.This teaching inverter system module adopts IGBT device as switching tube.Consider the reliable of student experimenting and fail safe, adopt with the IPM that IGBT drives and over-current over-voltage protection outputs signal, i.e. Integrated Smart Power module, this module stability is high, for middle low power occasion.Consider that student can do the three-phase inversion experiment that direct voltage is 600V ~ 800V on the platform, select the withstand voltage and resistance to stream of IPM should have larger allowance.The IPM model that this inverter system adopts is PM50RLA120, and this IPM can withstand voltage 1200V, and resistance to stream can reach 50A.Integrated 7 IGBT in this module, 6 should be used for forming three-phase inverter circuitry only, 1 switching device that can be used as BOOST circuit, can form twin-stage inverter structure inverter easily for student, and the present invention utilizes in this module 6 IGBT to be used for forming three-phase inverting circuit.
2, master controller
The control core of this teaching inverter system module is master controller, and this controller control voltage and electric current make it reach our predetermined reference value.Traditional controller mainly contains single-chip microcomputer, ARM, DSP etc.DSP is a kind of microprocessor of uniqueness, and it is not only programmable, and time in fact, the speed of service can reach every number of seconds with ten million bar complicated order program, considerably beyond general purpose microprocessor, is the computer chip become more and more important in the digitalized electron world.Its powerful data-handling capacity and the high speed of service are two the most commendable large characteristics.
This teaching inverter system module adopts model to be the master controller of dsp processor as inverter of TMS320F28335, and the function used mainly contains: input capture function, timer, PWM, UART, common I O function.
3, voltage-current sensor type selecting and circuit
Under this teaching inverter system module needs to make its state be operated in desired by us by the feedback of the variate-value such as filter inductance electric current, load voltage, DC side voltage of converter, line voltage of inverter ac side to inverter control.Need to detect relevant voltage and electric current for this reason, then the voltage and current signal detected is nursed one's health in scope that AD converter can change.Owing to there is the higher electronic power switch device of switching frequency in system, in inverter inductance current and output voltage, contain switching frequency multiple subharmonic.According to non-isolated measure voltage & current algorithm, control loop will be made to be subject to harmonic pollution, thus to reduce the antijamming capability of system, and stability.
For ensureing that weak electricity system and strong power system are isolated, employing Hall voltage, current sensor come detection system voltage, electric current.Consider that experiment porch power is not high, voltage level is not high yet, and the stability of requirement and precision do not need too high, then adopts domestic TBC-D series Hall current sensor and TBV10/20 series Hall voltage transducer.
TBC25D Hall current sensor is the punched-type transducer of rated current 25A.Operating voltage is ± 15V, and it is when rated current, and export the electric current of 25 ± 0.5%mA, offset current is ± 0.2mA, the highest 100KHz of bandwidth.
Tested voltage transitions is first become current signal by TBV10/20 Hall voltage transducer, and then utilizes Hall element to measure this magnitude of current, and exports the current signal becoming twice relation with the tested magnitude of current, this current signal and tested voltage completely isolated.Hall voltage transducer could be utilized after needing the electric current selecting suitable sampling resistor tested voltage transitions to be become moderate.The specified input current effective value of Hall voltage transducer is 10mA.If measuring voltage is U (V), then sampling resistor R >=U × 100 (Ω).This teaching inversion system module needs the voltage measured to be 48V DC bus-bar voltage, 18V ac output voltage (three-phase transformer low-pressure side).DC bus-bar voltage rank is the highest, and choosing series connection sampling resistor is 5.1K Ω, and when measuring direct voltage, Hall voltage transducer input current is 9.41mA (direct current), and outlet side output current is 18.82mA (direct current).For uniform sampling circuit, when voltage is 18V alternating voltage, series connection sampling resistor still gets 5.1K Ω, then Hall voltage transducer input current is 3.53mA (effective value), and outlet side output current is 7.06mA (effective value).
Electric power system comparatively conventional at present detects relevant bipolarity AD, and this teaching inverter system module is 76 series A D transducers of the production adopting AD company.This series of converter analog voltage input range divides ± 10V and ± 5V, and supply power voltage is ± 15V and ± 5V two kinds.This inversion system adopts AD7606, this transducer adopts 5V single power supply, realizing range by outside programming mode is the ± true bipolarity AD conversion of 10V or ± 5V, and its eight passage can be sampled simultaneously, and all passages all can be sampled with the throughput rate up to 200kSPS.Input clamp protection circuits can tolerate and be up to ± the voltage of 16.5V.No matter with which kind of sample frequency work, the analog input impedance of AD7606 is 1M Ω.It adopts single supply working method, has filtering and high input impedance in sheet, therefore without the need to driving operational amplifier and outside bipolar power supply.The 3dB cut-off frequency of AD7606 frequency overlapped-resistable filter is 22kHz; When sampling rate is 200ksps, it has the anti-aliasing suppression characteristic of 40dB.The AD conversion scope of AD7606 is made to be ± 5V herein by exterior arrangement.
The inverter ac side voltage recorded due to Hall voltage current sensor and electric current export with the form of ac current signal.Ac current signal to be converted to ac voltage signal by sampling resistor, can AD converter be utilized.Sampling resistor (measuring resistance) minimum value is 100 Ω, is 350 Ω to the maximum.This teaching inversion system module samples resistance is 200 Ω, and like this when voltage sensor exports 20mA electric current, the voltage on sampling resistor is 4V.Fig. 3 is Hall voltage sensor periphery circuit diagram, and C1, C2, C3, C4 in Fig. 3 are decoupling capacitor, for the impact of stress release treatment on sensor circuit.Resistance R4 is the series connection sampling resistor of Hall voltage transducer, and resistance R5 is output voltage sampling resistor.The Hall voltage sensor output voltage of Vout corresponding to P, N both end voltage.Then V
outcalculate by formula 1.
Hall voltage sensor output voltage and virtual voltage no-load voltage ratio are 2 × R5/R4.Get R5=200 Ω, R4=5.1K Ω, then no-load voltage ratio k
ud=1/12.75.
Fig. 4 is that TBC-D Hall passes current sensors peripheral circuit diagram, this sensor periphery circuit and voltage sensor basically identical.This current sensor, both by the mode of physical connection, measures the current value flow through; Also by the mode of perforation, contactless detection is through the current value in current sensor aperture.This teaching inversion system module utilizes contactless current measuring method.Hall current sensor output voltage and actual current no-load voltage ratio are R5/1000.When R5 gets 200 Ω, no-load voltage ratio is 1V/5A.
4, modulate circuit
Modulate circuit primarily of voltage follow and biasing circuit, frequency detection circuit, compare and circuits for triggering and absolute value circuit composition.
4.1, voltage follow and biasing circuit
Utilize Hall voltage current sensor tested voltage and electric current can be become the voltage signal with the-5V of its isolation ~+5V, after this voltage signal is input to voltage follower, can AD converter be sent into.The ac voltage signal of-5V ~+5V can be become the d. c. voltage signal of 0V ~+10V by an add circuit, if select suitable Hall voltage sampling resistance of current sensor just d. c. voltage signal can be become 0V ~+3V again, this signal can directly send into DSP internal A/D converter.Consider that student can utilize DSP internal A/D converter measuring voltage and electric current.Special increase by one voltage offset electric circuit, makes AC signal become direct current signal, as shown in Figure 5.
In Fig. 5, VOUT_SIN can be transported to outside AD, and the d. c. voltage signal after biased, when ensureing that its voltage is 0V ~+3V, can be transported on the inner AD pin of DSP.Only adopt an amplifier herein, this amplifier will make sinusoidal signal oppositely and biased+1.65V.When Hall element does not access follower, VD will be 15V or-15V.If now access DSP will burn DSP, therefore connect the voltage follower of a 3.3V single power supply in the inner AD input of DSP, this will ensure that the voltage signal flowing to DSP is within 3.3V.For reducing voltage follower to the electromagnetic interference in AD converter process, shielded type cable is adopted to transmit the voltage signal measured and obtain, and place a filter be made up of RC in the place near AD converter input pin, this filter is necessary near AD converter input pin, otherwise its effect will be had a greatly reduced quality.
4.2, frequency detection circuit
This inversion system needs to utilize hardware circuit detection of grid electric voltage frequency.Zero-crossing timing interval by detection of grid voltage calculates line voltage frequency.If by the zero-crossing comparator of alternating voltage by dual power supply, the positive and negative square-wave signal replaced will be exported at comparator output terminal.This signal also needs to become level through shaping again can send into DSP input capture pin after the square wave in 0-3.3V.If alternating voltage to be delivered directly to the zero-crossing comparator of single power supply, when alternating voltage instantaneous value is less than-0.7V, comparator will to export and alternating voltage is the identical level of timing, thus causes judging zero crossing.So the mains voltage signal after bias circuit Bias shown in employing Fig. 5 is transported to the comparator of the single power supply shown in Fig. 6, because network voltage detection signal becomes 1.65V, so compared with 1.65V by the voltage signal after biased by the biased rear zero crossing of+1.65V.When being greater than 1.65V, comparator exports 0V; Be less than 1.65V, comparator exports 3.3V.This square-wave signal directly can send into the input capture port of DSP.In order to prevent shaking during voltage zero-crossing point of power grid, adopt Schmidt's comparator, power taking resistance R34 is 200 Ω.Fig. 6 is line voltage frequency plot testing circuit, and R200, R201, C52 form T-shaped low pass filter, R200=R201=1K Ω, C52=104.The cut-off frequency of this filter is
frequency be the sinusoidal signal of 50Hz by this filter, phase place and amplitude change all less, ignore herein.
4.3, to compare and circuits for triggering
This teaching inverter system module be used for microgrid experiment porch, for Students ' Learning, test used.Student when inverter is not known and programme make mistakes time, there will be the extreme cases such as overcurrent.If do not add any safeguard measure, inverter will be made to receive damage within very short time, also can cause the perils such as fire.Therefore need to add over-current over-voltage protection on this experiment porch.The IPM itself that this inverter adopts exports with overcurrent, excess temperature signal but can not automatically close trivial trigger impulse, needs pwm pulse exclusive circuit to realize over-voltage over-current protection.
This teaching inversion system module is except the protection of employing IPM excess-current excess-temperature, and the voltage signal also utilizing Hall voltage, current sensor to detect to be converted to is to realize over-current over-voltage protection.After obtaining overcurrent-overvoltage signal, two kinds of methods are had to block the pwm control signal of IPM.By a mode for software, overcurrent-overvoltage signal is transported to the TZ pin (on this pin, level change can make DSP block PWM output, and output is fixed as high level or low level) of DSP, or utilizes interrupt routine to close PWM module.Another kind method is realized by external hardware exclusive circuit, by pwm signal by exporting after 74LS245,245 with Enable Pin (Low level effective), at enable lower ability output pwm signal, when over-voltage and over-current signal being detected, enable level is become high level from low level, thus blocks pwm signal.Second method, reliability is high, does not need software to coordinate, and is comparatively applicable to the inverter protection that this inversion system relates to.74LS245 is two-way, and control signal has EN and DIR, provides physical circuit.In addition, undeclared driving significant level.
This teaching inverter system module adopts hardware shut-off circuit, realizes over-current over-voltage protection.The voltage signal that Hall element exports is compared by comparator with a reference voltage, when Hall element output voltage higher (under overcurrent, overpressure situation), comparator output low level, on the contrary export high level.When comparator output low level, this low level available closes inverter, makes its output voltage, electric current be zero thus avoid over-voltage and over-current.But after closing PWM, comparator can recover high level again rapidly.Can repeat in the short period of time like this to unlock, block inverter, can not play a very good protection.
This teaching inverter system module connects a d type flip flop after comparator exports.The output state of comparator when this trigger can keep over-voltage and over-current, and reset by resetting port control trigger, thus realize reliable self-starting.Fig. 7 is comparator and circuits for triggering.By potentiometer resistance in adjustment figure, the threshold voltage of comparator can be changed, thus change the threshold value of overcurrent and overvoltage.
4.4, absolute value circuit
Due in alternating current circuit, over-voltage and over-current both may occur that forward was crossed and press through electricity, also negative sense over-voltage and over-current can be there is, this teaching inversion system module adopts the mode adding absolute value circuit, the voltage signal that Hall element exports is become the full half-wave voltage signal for positive voltage value, again this signal is sent into circuit shown in Fig. 7, just can ensure when forward and negative sense over-voltage and over-current, all can effective action.Absolute value circuit as shown in Figure 8.
5, relay protective scheme circuit
This teaching inverter system module utilizes 74LS245, when system overvoltage overcurrent, blocks pwm signal.Because three-phase inverter needs measurement four groups of magnitudes of voltage (the three-route voltage in three-phase voltage and direct voltage), four groups of current values (three-phase current and DC side electric current).Have eight tunnel protection values, IPM module also has four to pass by stream and overheat protector signal.As long as above 12 road guard signals have one the Enable Pin voltage of 74LS245 will be made to be high level for low level, block pwm signal.After 12 road guard signals and logical operation, give 245 through level shifting circuit and just can realize above-mentioned functions.Owing to there is no 12 tunnels and door chip, adopt containing four two inputs and the 74LS09 of door herein, because this chip is open collector, so can by with door line with, the quantity with door can be reduced like this.
The overcurrent-overvoltage export IPM and overheat protector, as backup protection, work when voltage-current sensor sampling is protected unsuccessfully.Voltage-current sensor sampling shutter threshold value is far below IPM rated voltage current value under normal circumstances, can block pwm signal before IPM protection act.IPM carries protection and only protects use in support, automatically discharges after allowing it protect a period of time.This teaching inversion system module discharges after adopting the guard signal exported by IPM by 555 monostable flipflops formed to keep 10s.When protection is worked, U2D output low level, this low level can be sent in DSP, by interrupt mode perception protection act, thus takes appropriate measures (as by disconnections such as contactors).The Enable Pin of 245 is Low level effective, and namely when not having over-voltage and over-current, this port will apply low level.During protection act, will apply high level to this port, so will add an inverter at U2D output, and adopt triode to form negative circuit, specific implementation as shown in Figure 9.
6, IPM drive circuit
Inner integrated 7 IGBT of the IPM that this teaching inverter system module adopts, have 7 control input ends to control conducting and the closedown of these 7 IGBT respectively.During IGBT control end input low level, the IGBT conducting of its correspondence; During input high level, the IGBT of its correspondence turns off.Only be greater than 9.0V during guaranteed control input end high level, when being less than 0.8V during low level, IPM just can normally work.Adopt HCPL4504 to design IPM drive circuit, physical circuit as shown in Figure 10.
The drive circuit of an IGBT in an IPM is only in Figure 10.This teaching inversion system module is three-phase inversion, needs 6 IGBT to work simultaneously, therefore needs the drive circuit of 6 this type.In Figure 10 PWM_IN be high level or high-impedance state time, HCPL4504 interior light emitting diodes does not work, and optocoupler output pin exports high level, and the inner corresponding IGBT of IPM closes; When PWM_IN is low level, HCPL4504 interior light emitting diodes works, optocoupler output pin output low level, the inner corresponding IGBT conducting of IPM.
Electric capacity C2 is used for stablizing GS both end voltage, improves interference rejection ability.When reality uses, electric capacity C2 is important, does not add this electric capacity, and IGBT can under the effect of interference, and random conducting is closed, and has a strong impact on the waveform quality that inverter exports.C2 value is got for 100pf in this inversion system.It is be added between the grid of IGBT and emitter that IGBT drives, and on three-phase full-bridge inverter, on brachium pontis, the emitter of IGBT is connected with the collector electrode of IGBT on lower brachium pontis, if upper and lower bridge arm IGBT drives adopt same 15V power supply, will make lower brachium pontis IGBT short circuit.So the 15V power supply that three-phase full-bridge inverter needs four to isolate, wherein drives power supply to respectively three upper brachium pontis IGBT for three, powers to lower brachium pontis three IGBT for all the other one.
7, contactor drive circuit
This teaching inverter system module utilizes contactor that inverter and DC bus, three phase network, threephase load are isolated.Because contactor driving voltage and electric current are all comparatively large, need to utilize relay to drive contactor.The three-phase contactor driving voltage that this teaching inverter system module is selected is 24V.First utilize triode control 24V relay, recycle this relay to drive contactor, specific implementation as shown in figure 11.The 24V relay selected is that an input, is often opened, a normally closed structure.Relay output loop port is all drawn by phoenix terminal and is connected with power supply and three-phase contactor in outside.For observing relay connecting and disconnecting situation intuitively, add LED especially, output to phoenix terminal after this LED is in series with a resistor, the mode by external cabling is received on contactor, makes LED luminous when contactor closes.For reducing relay when driving contactor on the impact controlling side, Drive and Control Circuit and drive circuit are isolated by employing optocoupler.
Claims (10)
1. teaching inversion system module, is characterized in that: comprise master controller, D.C. contactor, IPM inverter, filter circuit, isolating transformer, D.C. contactor driving, electric current and voltage sample circuit I, modulate circuit I, IPM drive circuit, relay protective scheme circuit, electric current and voltage sample circuit II, modulate circuit II, A/D converter, A.C. contactor and A.C. contactor and drive, described IPM inverter is connected with DC bus by D.C. contactor, described D.C. contactor is driven by D.C. contactor and is connected with master controller, described IPM inverter is by after filter circuit and isolating transformer, be connected with load and electrical network respectively through after A.C. contactor, described A.C. contactor is driven by A.C. contactor and is connected with master controller, described IPM inverter is connected with master controller with relay protective scheme circuit by IPM drive circuit, electric current and voltage sample circuit I is connected between described D.C. contactor and IPM inverter, described electric current and voltage sample circuit I is connected to modulate circuit I, described modulate circuit I is connected respectively to relay protective scheme circuit and A/D converter, connect electric current and voltage between described filter circuit and isolating transformer to sample electric II, described electric current and voltage sample circuit II is connected to modulate circuit II, modulate circuit II is connected respectively to A/D converter and master controller, described A/D converter is connected with master controller.
2. teaching inversion system module according to claim 1, is characterized in that: described master controller adopts model to be the dsp processor of TMS320F28335.
3. teaching inversion system module according to claim 1, is characterized in that: described IPM inverter adopts IGBT device as switching device.
4. teaching inversion system module according to claim 1, is characterized in that: described IPM inverter adopts model to be the IPM of PM50RLA120.
5. teaching inversion system module according to claim 1, is characterized in that: described electric current and voltage sample circuit adopts voltage sensor and current sensor to carry out electric current and voltage sampling respectively.
6. teaching inversion system module according to claim 5, it is characterized in that: described voltage sensor and current sensor are Hall element, described voltage sensor adopts TBV10/20 series Hall voltage transducer, and described current sensor adopts TBC-D series Hall current sensor.
7. teaching inversion system module according to claim 1, is characterized in that: the model of described A/D converter is AD7606.
8. teaching inversion system module according to claim 1, is characterized in that: described IPM drive circuit comprises photoelectrical coupler, the model of described photoelectrical coupler is HCPL4504.
9. teaching inversion system module according to claim 1, is characterized in that: described inversion system module also comprises LCD display, and described LCD display is connected with controller.
10. teaching inversion system module according to claim 1, is characterized in that: described inversion system module also comprises keyboard, and described keyboard is connected with controller.
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| CN201510691401.0A CN105245126A (en) | 2015-10-22 | 2015-10-22 | Teaching inverter system module |
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| CN201510691401.0A CN105245126A (en) | 2015-10-22 | 2015-10-22 | Teaching inverter system module |
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| CN106026074A (en) * | 2016-05-25 | 2016-10-12 | 安徽大学 | Low-voltage DC micro-grid experiment platform |
| CN106251755A (en) * | 2016-08-22 | 2016-12-21 | 朱凌 | A kind of portable light overhead utility analog meter |
| CN106952547A (en) * | 2017-05-22 | 2017-07-14 | 南昌航空大学 | Grid-connected photovoltaic power generation experiment device for teaching |
| CN108011454A (en) * | 2017-12-18 | 2018-05-08 | 湘潭大学 | Switching device and control method based on multi-emitting resonance type wireless transmission system |
| CN108105808A (en) * | 2017-11-14 | 2018-06-01 | 西安理工大学 | Electromagnetic oven Working state checking circuit and switching frequency control method |
| CN109194163A (en) * | 2018-09-30 | 2019-01-11 | 广西南宁市晨启科技有限责任公司 | A kind of three-phase unsteady flow experiement control device and its experiment control method |
| CN113053203A (en) * | 2021-05-10 | 2021-06-29 | 新能职业培训学校(天津)有限公司 | Low-voltage full-power converter teaching aid |
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| CN106026074A (en) * | 2016-05-25 | 2016-10-12 | 安徽大学 | Low-voltage DC micro-grid experiment platform |
| CN106251755A (en) * | 2016-08-22 | 2016-12-21 | 朱凌 | A kind of portable light overhead utility analog meter |
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| CN108105808B (en) * | 2017-11-14 | 2019-06-18 | 西安理工大学 | Electromagnetic oven Working state checking circuit and switching frequency control method |
| CN108011454A (en) * | 2017-12-18 | 2018-05-08 | 湘潭大学 | Switching device and control method based on multi-emitting resonance type wireless transmission system |
| CN109194163A (en) * | 2018-09-30 | 2019-01-11 | 广西南宁市晨启科技有限责任公司 | A kind of three-phase unsteady flow experiement control device and its experiment control method |
| CN109194163B (en) * | 2018-09-30 | 2023-11-28 | 广西南宁市晨启科技有限责任公司 | Three-phase variable current experiment control device and experiment control method thereof |
| CN113053203A (en) * | 2021-05-10 | 2021-06-29 | 新能职业培训学校(天津)有限公司 | Low-voltage full-power converter teaching aid |
| CN113053203B (en) * | 2021-05-10 | 2023-03-14 | 新能职业培训学校(天津)有限公司 | Low-voltage full-power converter teaching aid |
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Application publication date: 20160113 |