CN203775067U - Three-phase bridge type PWM converter - Google Patents
Three-phase bridge type PWM converter Download PDFInfo
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- CN203775067U CN203775067U CN201320774987.3U CN201320774987U CN203775067U CN 203775067 U CN203775067 U CN 203775067U CN 201320774987 U CN201320774987 U CN 201320774987U CN 203775067 U CN203775067 U CN 203775067U
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- 238000005516 engineering process Methods 0.000 description 8
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/20—Active power filtering [APF]
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Abstract
The utility model discloses a three-phase bridge type PWM converter. The three-phase bridge type PWM converter includes a first bridge arm circuit, a second bridge arm circuit and a third bridge arm circuit of which the connection modes are identical; one end of each bridge arm circuit is connected with the positive pole of a capacitor, and the other end of each bridge arm circuit is connected with the negative pole of the capacitor; and each bridge arm circuit includes two IGBTs in series connection, wherein each IGBT is connected in parallel with a diode. The utility model discloses an active electric power filter with the three-phase bridge-type PWM converter. With the three-phase bridge type PWM converter and the active electric power filter formed by the same adopted, harmonic and active power of which the frequencies and magnitudes change can be compensated, and the defects of a passive filter can be eliminated, and compensation characteristics are better than the passive filter can be obtained.
Description
Technical field
The utility model relates to power equipment and manufactures field, particularly relates to a kind of three-phase bridge PWM(pulse duration debugging) current transformer; The utility model also relates to a kind of Active Power Filter-APF with described three-phase bridge PWM current transformer.
Background technology
Along with the development of modern industry, in electric power system, nonlinear load rolls up.Various non-linear and time variation electronic installations are applied on a large scale as inverter, rectifier and various Switching Power Supplies etc., and its negative effect is also day by day obvious.The power electronic equipments such as inverter, rectifier and various Switching Power Supplies inject a large amount of harmonic waves in the time of switch motion in electrical network, make the waveform serious distortion of the voltage and current in electrical network.Power electronic equipment has become the topmost harmonic source of electrical network, and the research of the harmonic pollution problem that it is brought also becomes a focus of paying close attention to and studying of power electronics engineering field.At present, standard and the regulation of all having formulated development electric power system and power electronic equipment harmonic wave are organized in many countries and academic research.
20th century 20, the thirties be in Germany, and owing to using static mercury arc current transformer to cause the distortion of voltage, electric current, harmonic problem has just caused people's attention and research.1945, J.C.Read delivered the classical paper of early stage harmonic wave research, and to the 1950's and the sixties, the development of high voltage dc transmission technology, has promoted converter harmonic research further deeply.Since 20 century 70s, due to the develop rapidly of power electronic technology, various power electronic equipments are applied increasingly extensive in electric power system, industry, agricultural, traffic and daily life, and the harm that harmonic wave causes is also on the rise, and countries in the world are to harmonic problem also growing interest.
Along with continuing to increase of the increasing and installed capacity of power electronic equipment application, the harmonic wave proportion of its generation is also increasing, has become the main harmonic pollution source of electric power system at present.Harmonic wave roughly has the harm of utility network and other system:
(1) make the element in electrical network produce additional harmonic loss, as make motor cause that supplementary load loss, heating increase, overload capacity, useful life and Efficiency Decreasing, produce pulsating torque; Reduced in addition the efficiency of generating, transmission of electricity and power consumption equipment, 3 a large amount of subharmonic currents flow through the neutral line can cause the overheated even breaking out of fire of center line.
(2) the pressure drop meeting of harmonic current on transmission line makes the voltage waveform of user side produce serious distortion, affects the normal work of electric equipment.Harmonic wave makes the apparatus overheat such as capacitor, cable, ageing of insulation, the lost of life, so that damage.
(3) easily make electrical network and local in parallel or series resonance occurs for the shunt capacitor of compensation network reactive power, causing overvoltage or overcurrent, making capacitor insulation aging, even causing serious accident.According to statistics, the electric capacity fault causing due to harmonic problem accounts for 71%～83% of capacitor total failare.
(4) harmonic wave can cause the misoperation of relaying protection and automatics, and makes electric survey metering instrument inaccurate, affects measuring accuracy.
(5) harmonic wave can produce and disturb the communication system of closing on, and the lighter produces noise, reduces communication quality, and severe one causes information dropout, and communication system cannot normally be worked.
The problem that solves power electronic equipment and other harmonic pollution sources, Basic Ways has two: one is that harmonic compensation device is set, and as various passive, active filters, this is all suitable for various harmonic sources; Another kind is for power electronic equipment harmonic source, can transform it, makes it not produce harmonic wave or non-consume reactive power, as Active Power Factor Correction Technology and PWM commutation technique.
In electric power system, install the Main Means that LC tuned filter is traditional compensating reactive power and harmonic wave always.LC tuned filter is simple in structure because of it, both can compensating reactive power, and can suppress harmonic wave again and be widely used always.But LC tuned filter also exists the drift that depends on electrical network and load parameter, LC parameter such as filtering compensation characteristic can be caused the change of filtering characteristic, have that negative voltage is adjusted effect, weight is large, volume is large and the shortcoming such as easy homologous ray generation resonance.
Utility model content
The technical problems to be solved in the utility model be to provide a kind of can real-Time Compensation mains by harmonics and idle three-phase bridge PWM current transformer;
Another technical problem to be solved in the utility model is to provide a kind of Active Power Filter-APF (Active Power Filter-APF) with dynamic inhibition harmonic wave and compensating reactive power, can be to frequency and big or small harmonic wave and idle the compensating all changing, can make up the shortcoming of passive filter, obtain than the better compensation characteristic of passive filter.
For solving the problems of the technologies described above, three-phase bridge PWM current transformer of the present utility model, comprising:
The first bridge arm circuit, comprise: an IGBT T1 of series connection and the 2nd IGBT T2, the collector electrode of the one IGBT T1 connects the positive pole of capacitor C d, the emitter of the 2nd IGBT T2 connects the negative pole of capacitor C d, the one IGBT T1 emitter is as the first current output terminal ica, the first diode D1 positive pole connects the collector electrode of an IGBT T1, the first diode D1 negative pole connects the emitter of an IGBT T1, the second diode D2 positive pole connects the collector electrode of the 2nd IGBT T2, and the second diode D2 negative pole connects the emitter of the 2nd IGBT T2;
The second bridge arm circuit, comprise: the 3rd IGBT T3, the 4th IGBT T4, the 3rd diode D3 and the 4th diode D4, the each electric component connected mode of the second bridge arm circuit is identical with the first bridge arm circuit, and the 3rd IGBT T3 emitter is as the second current output terminal icb;
The 3rd bridge arm circuit, comprise: the 5th IGBT T5, the 6th IGBT T6, the 5th diode D5 and the 6th diode D6, the each electric component connected mode of the 3rd bridge arm circuit is identical with the first bridge arm circuit, and the 5th IGBT T5 emitter is as the 3rd current output terminal icc.
Active Power Filter-APF of the present utility model, comprising:
DSP control circuit, adopts floating-point microprocessor as main control chip, and control system is aided with CPLD chip carries out the logical process of digital signal, and CPLD chip completes sampled signal processing, controls calculating, circuit protection and pwm signal output function;
AD input and conditioning unit, threephase load current signal detects, two-phase active electric power filter to output current detects, two-phase LC filter circuit output electric current measure, DC capacitor voltage detects, detect through instrument transformer, after discharge circuit conditioning, processed by outside AD sampling A/D chip output digit signals to DSP control circuit;
Protective circuit, the failure-free operation of protection Active Power Filter-APF, when Active Power Filter-APF DC capacitor voltage too high, or upper and lower electric capacity voltage difference is excessive, line voltage is abnormal, and when power device IGBT excess Temperature, protective circuit just produces guard signal, cut off PWM output signal, close three-phase bridge PWM current transformer;
PWM driver element, DSP control circuit after calculation process, produce pwm signal, by outside amplifying circuit amplifying signal, then through isolated drive circuit form have driving force PWM drive signal drive the three-phase bridge PWM current transformer in main power circuit;
Three-phase bridge PWM current transformer, receives PWM and drives signal, and output reactive current is to electrical network, and IGBT module is sent temperature signal and is delivered to IGBT temperature detecting unit; Described IGBT module is described bridge arm circuit, can send temperature signal;
IGBT temperature detecting unit, is completed by an independent AD chip, exports DSP control circuit to by twin wire serial bus communication interface;
Communication unit, has serial communication interface and Serial Peripheral Interface.
Three-phase bridge PWM current transformer of the present utility model (it realizes inversion module function in the utility model Active Power Filter-APF operation principle), receive SPWM and drive signal, according to driving signal to carry out switch to IGBT module, the direct current signal on DC capacitor is changed into the required ac filter electric current of electrical network and exchanges reactive current.
The utility model Active Power Filter-APF operation principle is as shown in Figure 2: active power filter system is made up of four parts, and sample circuit (harmonic wave and Detecting Reactive Current sampling), main control circuit (DSP governor circuit), drive circuit and inversion module form.
Ua, Ub, Uc is ac grid voltage, and load is harmonic source, and it produces harmonic wave and consumes idle.
The three-phase voltage signal of load and three-phase current signal export the input of sampling module to, the biphase current signal of tri-level inversion module output exports the input of sampling module to, the biphase current signal of LC filter circuit output exports the input of sampling module to, and the voltage signal of DC capacitor output exports the input of sampling module to.Above voltage, current signal input to after sampling module, are converted into small voltage, little current signal after transducer, amplifier.
The small voltage of sampling module output, it (is to adopt floating-point microprocessor as main control chip that little current signal exports DSP control circuit to, it is DPS+CPLD that control system is aided with the logical process that CPLD chip carries out digital signal) input, in DSP control circuit, the AD sampling A/D chip of CPLD control module is by small voltage, little current signal is converted into digital signal, transfer to DSP, DSP calculates the harmonic current of the required compensation of electrical network according to sampled signal, send pwm signal according to the harmonic current calculating, SPWM(Sinusoidal Pulse Width Modulation sinusoid pulse width modulation debugging) signal is converted into SPWM signal and exports to the input of drive circuit after CPLD processes, drive circuit exports the input of inversion module to after SPWM signal is amplified.
The direct voltage output of the output of DC capacitor is to the input of inversion module, inversion module carries out switch according to SPWM signal, direct voltage is converted into alternating voltage, inversion module output AC voltage is to the input of LC filter circuit, alternating voltage after LC filter circuit output AC offset current to electrical network, to eliminate the harmonic current of electrical network.
Three-phase bridge PWM current transformer energy energy real-Time Compensation mains by harmonics and idle of the present utility model;
Active Power Filter-APF of the present utility model can be achieved as follows function:
L, realized dynamic compensation, harmonic wave and the reactive power that can all change frequency and size compensate, and the large I of compensating power is accomplished continuous adjusting.
2, required energy-storage travelling wave tube capacity does not need too large when compensation harmonic, when compensating power, do not need energy-storage travelling wave tube, therefore DC bus capacitor device capacity requirement is not high, can save large inductance and large electric capacity in conventional compensation arrangement simultaneously, make APF(Active Power Filter-APF) device volume reduce, and less capacitance in system generally use be also difficult for produce resonance.
Even if 3 target compensation electric currents are excessive, Active Power Filter-APF also can not transship, and can normally bring into play compensating action.
4, adopt digital control technology, system reliability is high.
5, control flexible, fast response time, adjustable range is wide, the variation of energy Tracking Frequency of Power Grids, the impact that compensation performance is not changed by mains frequency.
6, operation noise is little, safety and stability, and without wearing and tearing, machinery-free noise, can improve device lifetime, improves the impact on environment.
7, connection reactance is little, and system bulk is little.The connection reactance of APF access electrical network, for the higher harmonics of filtering electric current, is played in addition by inverter and these two effects that alternating-current voltage source couples together of electrical network, therefore required inductance value little.
8, adopt high-frequency turn-off device, then combine with the multiple technology SPWM technology of bridge-type alternating current circuit, can obtain comparatively ideal sinusoidal current waveform.
Brief description of the drawings
Below in conjunction with accompanying drawing and embodiment, the utility model is described in further detail:
Fig. 1 is the structural representation of the utility model three-phase bridge PWM current transformer one embodiment.
Fig. 2 is the operation principle schematic diagram of the utility model Active Power Filter-APF.
Fig. 3 is the structural representation of the utility model Active Power Filter-APF one embodiment.
Description of reference numerals
Cd electric capacity
D1～D6 is the first～six diode
T1～T6 is the first～six IGBT
Ica is the first current output terminal
Icb the second current output terminal
Icc is the 3rd current output terminal
Usa, Usb, Usc are three phase network voltage
Isa, isb, isc are three phase network electric currents
Ila, ilb, ilc are threephase load electric currents
Ua, Ub, Uc are line voltages
ADC is AD input and conditioning unit
DSP+CPLD is DSP control circuit
Embodiment
As shown in Figure 1, the utility model three-phase bridge PWM current transformer one embodiment comprises: the first bridge arm circuit, comprise: an IGBT T1 of series connection and the 2nd IGBT T2, the collector electrode of the one IGBT T1 connects the positive pole of capacitor C d, the emitter of the 2nd IGBT T2 connects the negative pole of capacitor C d, the one IGBT T1 emitter is as the first current output terminal ica, the first diode D1 positive pole connects the collector electrode of an IGBT T1, the first diode D1 negative pole connects the emitter of an IGBT T1, the second diode D2 positive pole connects the collector electrode of the 2nd IGBT T2, the second diode D2 negative pole connects the emitter of the 2nd IGBT T2,
The second bridge arm circuit, comprise: the 3rd IGBT T3 of series connection and dead IGBT T4, the collector electrode of the 3rd IGBT T3 connects the positive pole of capacitor C d, the emitter of the 4th IGBT T4 connects the negative pole of capacitor C d, the 3rd IGBT T3 emitter is as the second current output terminal icb, the 3rd diode D3 positive pole connects the collector electrode of the 3rd IGBT T3, the 3rd diode D3 negative pole connects the emitter of the 3rd IGBT T3, the 4th diode D4 positive pole connects the collector electrode of the 4th IGBT T4, and the 4th diode D4 negative pole connects the emitter of the 4th IGBT T4;
The 3rd bridge arm circuit, comprise: the 5th IGBT T5 of series connection and the 6th IGBT T6, the collector electrode of the 5th IGBT T5 connects the positive pole of capacitor C d, the emitter of the 6th IGBT T6 connects the negative pole of capacitor C d, the 5th IGBT T5 emitter is as the 3rd current output terminal ica, the 5th diode D5 positive pole connects the collector electrode of the 5th IGBT T5, the 5th diode D5 negative pole connects the emitter of the 5th IGBT T5, the 6th diode D6 positive pole connects the collector electrode of the 6th IGBT T6, and the 6th diode D6 negative pole connects the emitter of the 6th IGBT T6;
As shown in Figure 3, Active Power Filter-APF one embodiment of the present utility model, comprising:
DSP control circuit, adopts floating-point microprocessor as main control chip, and control system is aided with CPLD chip carries out the logical process of digital signal, and CPLD chip completes sampled signal processing, controls calculating, circuit protection and pwm signal output function; In the present embodiment, DSP control circuit is taking 32 floating-point microprocessor TMS320C28346 of TI company as main control chip, TMS320C28346 is under the jurisdiction of Delfino MCU series of products member, running frequency can be up to 300MHZ, is, high performance solution integrated for the height that requires strict control application.Control system is aided with the EPM570T100CPLD chip of altera corp, and CPLD mainly carries out the logical process of some digital signals.
AD input and conditioning unit, threephase load current signal detects, two-phase active electric power filter to output current detects, two-phase LC filter circuit output electric current measure, DC capacitor voltage detects, and detects, after discharge circuit conditioning through instrument transformer, processed to DSP control circuit by outside AD sampling A/D chip output digit signals, the AD of the present embodiment portion sampling A/D chip adopts AD7656;
Protective circuit, the failure-free operation of protection Active Power Filter-APF, when Active Power Filter-APF DC capacitor voltage too high, or upper and lower electric capacity voltage difference is excessive, line voltage is abnormal, and when power device IGBT excess Temperature, protective circuit just produces guard signal, cut off PWM output signal, close three-phase bridge PWM current transformer;
PWM driver element, DSP control circuit after calculation process, produce pwm signal, by outside amplifying circuit amplifying signal, then through isolated drive circuit form have driving force PWM drive signal drive the three-phase bridge PWM current transformer in main power circuit;
Three-phase bridge PWM current transformer (can adopt structure as shown in Figure 1), receives PWM and drives signal, and output reactive current is to electrical network, and IGBT module is sent temperature signal and is delivered to IGBT temperature detecting unit; Described IGBT module is described bridge arm circuit, can send temperature signal;
IGBT temperature detecting unit, completes the present embodiment by an independent AD chip and adopts AD7995, exports DSP control circuit to by twin wire serial bus communication interface;
Communication unit, has serial communication interface and Serial Peripheral Interface, can with SVG(static reacance generator), APF module or the communication of integrated control centre.
Below through the specific embodiment and the embodiment the utility model is had been described in detail, but these not form restriction of the present utility model.In the situation that not departing from the utility model principle, those skilled in the art also can make many distortion and improvement, and these also should be considered as protection range of the present utility model.
Claims (1)
1. a three-phase bridge PWM current transformer, is characterized in that, comprising:
The first bridge arm circuit, comprise: an IGBT (T1) of series connection and the 2nd IGBT (T2), the collector electrode of the one IGBT (T1) connects the positive pole of electric capacity (Cd), the emitter of the 2nd IGBT (T2) connects the negative pole of electric capacity (Cd), the one IGBT (T1) emitter is as the first current output terminal (ica), the first diode (D1) positive pole connects the collector electrode of an IGBT (T1), the first diode (D1) negative pole connects the emitter of an IGBT (T1), the second diode (D2) positive pole connects the collector electrode of the 2nd IGBT (T2), the second diode (D2) negative pole connects the emitter of the 2nd IGBT (T2),
The second bridge arm circuit, comprise: the 3rd IGBT (T3), the 4th IGBT (T4), the 3rd diode (D3) and the 4th diode (D4), the each electric component connected mode of the second bridge arm circuit is identical with the first bridge arm circuit, and the 3rd IGBT (T3) emitter is as the second current output terminal (icb);
The 3rd bridge arm circuit, comprise: the 5th IGBT (T5), the 6th IGBT (T6), the 5th diode (D5) and the 6th diode (D6), the each electric component connected mode of the 3rd bridge arm circuit is identical with the first bridge arm circuit, and the 5th IGBT (T5) emitter is as the 3rd current output terminal (icc).
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| CN201320774987.3U CN203775067U (en) | 2013-11-29 | 2013-11-29 | Three-phase bridge type PWM converter |
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| CN201320774987.3U CN203775067U (en) | 2013-11-29 | 2013-11-29 | Three-phase bridge type PWM converter |
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| CN203775067U true CN203775067U (en) | 2014-08-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103607133A (en) * | 2013-11-29 | 2014-02-26 | 科大智能科技股份有限公司 | Three-phase bridge PWM converter and active power filter formed by same |
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- 2013-11-29 CN CN201320774987.3U patent/CN203775067U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103607133A (en) * | 2013-11-29 | 2014-02-26 | 科大智能科技股份有限公司 | Three-phase bridge PWM converter and active power filter formed by same |
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| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information |
Inventor after: Zhang Jun Inventor after: Zhou Fengxue Inventor after: Tang Wei Inventor after: Jia Yuntong Inventor after: Zuo Hang Inventor before: Zhang Jun Inventor before: Zhou Fengxue Inventor before: Tang Wei Inventor before: Jia Yuntong |
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| COR | Change of bibliographic data | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140813 |
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| CF01 | Termination of patent right due to non-payment of annual fee |