CN103618463A - Wideband low-distortion combined three-phase inverter - Google Patents
Wideband low-distortion combined three-phase inverter Download PDFInfo
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- CN103618463A CN103618463A CN201310593918.7A CN201310593918A CN103618463A CN 103618463 A CN103618463 A CN 103618463A CN 201310593918 A CN201310593918 A CN 201310593918A CN 103618463 A CN103618463 A CN 103618463A
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Abstract
The invention discloses a wideband low-distortion combined three-phase inverter which solves the problems that an existing three-phase inverter cannot perform inversion in a wide frequency range, the waveform distortion degree of output voltages is high, the unbalanced load capacity of a system is low, and the adjusting accuracy of output frequency is low. The wideband low-distortion combined three-phase inverter which performs variable frequency regulation in a wide frequency band range comprises an inversion power source control portion, a comprehensive control portion and a main control portion. The inversion power source control portion comprises a power input circuit, a three-phase rectifying circuit, a three-phase inversion circuit, a high-frequency transformer, a high-frequency inversion power source, a high-frequency rectification filter circuit, a power output circuit, a voltage/current sampling circuit and a digital signal processor. A self-adaptive synchronous modulation method and the polarity frequency multiplication modulation and embedded compound control (repetitive control and PID control) combined control strategy are adopted in the wideband low-distortion combined three-phase inverter. The wideband low-distortion combined three-phase inverter belongs to the scope of special power sources and can be applied to the fields of fault diagnosis, fault analytical tests and the like.
Description
Technical field
The present invention relates to a kind of Wide-band Low-distortion Combined three phase inverter, belong to special power supply category, can be applied to the fields such as failure diagnosis, analytical test.
Background technology
Wide-band Low-distortion three phase mains some special occasions in the urgent need to, as the driving source of the devices such as ground network detection and diagnosis, magnetic starter on-line testing, the special-purpose driving power of electric vibration testing bench, aerospace field is produced and debugging power source special.These class power technology performance index are more special, belong to special power supply category.Seldom having in the market the power supply that meets these applications completely, is to be all also similarly special purpose specialized designs even if having, and cost is higher, and versatility is poor, therefore this class special power supply is needed to special exploitation.Sinusoidal pulse width modulation (SPWM) technology is widely applied in inverter, and it can be realized by hardware approach and software approach conventionally.But due to hardware inherent defect and can not implement advanced control strategy, cause the performance of inverter greatly not improve. the method that software is realized needs real-time carrying out to calculate in a large number, appearance along with high speed microprocessor, particularly there is the appearance of the digital signal processor (DSP) of high-speed computation ability and powerful control ability, make inverter adopt complex digital control method to become possibility.
Summary of the invention
The invention provides a kind of Wide-band Low-distortion Combined three phase inverter, having solved existing three-phase inversion device can not carry out inversion, the output voltage waveforms distortion factor is high, system band unbalanced load ability is low, output frequency degree of regulation is low problem at wide frequency ranges.
A Wide-band Low-distortion Combined three phase inverter, comprises inverter control section, Comprehensive Control part and master control part; Described inverter control section comprises power supply input circuit, rectified three-phase circuit, high frequency transformer, high frequency inverter, rectifier filter circuit, power output circuit, voltage sample circuit, current sampling circuit; Described Comprehensive Control partly comprises signal input circuit, signal isolation circuit; Described master control part is divided and is comprised pwm control circuit, under-voltage protecting circuit, current foldback circuit and drive circuit; Wherein, the output of power supply input circuit connects the input of rectified three-phase circuit; The output of rectified three-phase circuit connects the input of high frequency transformer; The output of high frequency transformer connects the input of high frequency inverter; The output of high frequency inverter connects the input of rectifier filter circuit; The output of rectifier filter circuit connects the input of power output circuit; The output of power output circuit connects respectively the input of voltage sample circuit and the input of current sampling circuit; The input of the output linking number word signal processor of voltage sample circuit; The input of the output linking number word signal processor of current sampling circuit; The output of under-voltage protecting circuit, the output of current foldback circuit all connect the input of pwm control circuit; The output of pwm control circuit connects the input of drive circuit; The output of drive circuit connects the input of high frequency inverter; The output of signal input circuit connects the input of signal isolation circuit; The output of signal isolation circuit connects the input that gate is controlled circuit; Gate is controlled the input of the output connection pwm control circuit of circuit.
During work, the input of power supply input circuit connects external ac power source.The output of power output circuit connects the feeder ear of three-phase inversion device.The input of signal input circuit connects external control signal.Specific works process comprises: one, when carrying out power supply control, the electric current and voltage of external ac power source output successively through power supply input circuit, rectified three-phase circuit, high frequency transformer, high frequency inverter, rectifier filter circuit input, rectification, transformation, inversion, filtering, finally by power output circuit, to three-phase inversion device, power.In power supply process, voltage sample circuit samples the voltage of power output circuit.Meanwhile, current sampling circuit samples the electric current of power output circuit.Pwm control circuit generates pwm control signal according to the order of digital signal processor, and by pwm control signal input driving circuit.Drive circuit is controlled the electric current and voltage of high frequency inverter according to pwm control signal, thus the operating voltage of three-phase inversion device and operating current is controlled.In this process, under-voltage protecting circuit carries out under-voltage protection to pwm control circuit, and current foldback circuit carries out overcurrent protection to pwm control circuit, guarantees thus the normal operation of pwm control circuit.Two, when carrying out Comprehensive Control, external control signal successively through signal input circuit, signal isolation circuit, gate control that circuit is inputted, isolation, logical operation, signal input pwm control circuit, pwm control circuit generates pwm control signal according to this road signal, and by pwm control signal input driving circuit.Drive circuit is controlled the electric current and voltage of high frequency inverter according to pwm control signal, thus the operating voltage of three-phase inversion device and operating current is controlled.In this process, under-voltage protecting circuit carries out under-voltage protection to pwm control circuit, and current foldback circuit carries out overcurrent protection to pwm control circuit, guarantees thus the normal operation of pwm control circuit.Based on said process; compare with existing three-phase inversion device; novel wide-band low distortion Combined three phase inverter tool of the present invention has the following advantages: one, aspect power supply control; novel wide-band low distortion Combined three phase inverter of the present invention adopts high frequency inverter and has set up under-voltage protecting circuit and current foldback circuit; thereby effectively increased power factor; effectively improve power-efficient (being increased to more than 85% by 75% left and right), effectively reduced peak valley voltage fluctuation.Meanwhile, novel wide-band low distortion Combined three phase inverter of the present invention has saved rectifier transformer, thereby effectively reduces the weight of three-phase inversion device.Two, aspect Comprehensive Control; novel wide-band low distortion Combined three phase inverter of the present invention adopts analog circuit and digital circuit; and set up under-voltage protecting circuit and current foldback circuit, and effectively strengthened job stability, effectively reduce failure rate.In sum, novel wide-band low distortion Combined three phase inverter of the present invention is by adopting brand-new control structure, efficiently solves that existing oxyhydrogen generator control device power factor is low, power-efficient is low, peak valley voltage fluctuation large, job insecurity and the high problem of failure rate.
The present invention is based on brand-new control structure, efficiently solving existing three-phase inversion device can not carry out inversion, the output voltage waveforms distortion factor is high, system band unbalanced load ability is low, output frequency degree of regulation is low problem at wide frequency ranges.
Accompanying drawing explanation
Fig. 1 is the structural representation of inverter control section of the present invention and master control part;
Fig. 2 is the structural representation of Comprehensive Control part of the present invention and master control part;
In figure: 1-power supply input circuit, 2-rectified three-phase circuit, 3-broadband transformer; 4-wideband inverter, 5-wideband current rectifying and wave filtering circuit, 6-power output circuit; 7-voltage sample circuit; 8-current sampling circuit, 9-signal input circuit, 10-signal isolation circuit; 12-pwm control circuit; 13-under-voltage protecting circuit, 14-current foldback circuit, 15-drive circuit.
Embodiment
A kind of Wide-band Low-distortion Combined three phase inverter comprises inverter control section, Comprehensive Control part and master control part; Described inverter control section comprises power supply input circuit 1, rectified three-phase circuit 2, three-phase inverting circuit, broadband transformer 3, wideband inverter 4, wideband current rectifying and wave filtering circuit 5, power output circuit 6, voltage sample circuit 7.Wherein, the output of power supply input circuit 1 connects the input of rectified three-phase circuit 2; The output of rectified three-phase circuit 2 connects the input of high frequency transformer 3; The output of high frequency transformer 3 connects the input of high frequency inverter 4; The output of high frequency inverter 4 connects the input of rectifier filter circuit 5; The output of rectifier filter circuit 5 connects the input of power output circuit 6; The output of power output circuit 6 connects respectively the input of voltage sample circuit 7 and the input of current sampling circuit 8; The input of the output linking number word signal processor 16 of voltage sample circuit 7; The input of the output linking number word signal processor 16 of current sampling circuit 8; The output of the output of under-voltage protecting circuit 13, current foldback circuit 14 all connects the input of pwm control circuit 12; The output of pwm control circuit 12 connects the input of drive circuit 15; The output of drive circuit 15 connects the input of high frequency inverter 4; The output of signal input circuit 9 connects the input of signal isolation circuit 10; The output of signal isolation circuit 10 connects the input that gate is controlled circuit 11; Gate is controlled the input of the output connection pwm control circuit 12 of circuit 11.
Claims (1)
1. a Wide-band Low-distortion Combined three phase inverter, comprises inverter control section, Comprehensive Control part and master control part; Described inverter control section comprises power supply input circuit (1), rectified three-phase circuit (2), three-phase inverting circuit, broadband transformer (3), wideband inverter (4), wideband current rectifying and wave filtering circuit (5), power output circuit (6), voltage sample circuit (7), it is characterized in that, the output of power supply input circuit (1) connects the input of rectified three-phase circuit (2); The output of rectified three-phase circuit (2) connects the input of high frequency transformer (3); The output of high frequency transformer (3) connects the input of high frequency inverter (4); The output of high frequency inverter (4) connects the input of rectifier filter circuit (5); The output of rectifier filter circuit (5) connects the input of power output circuit (6); The output of power output circuit (6) connects respectively the input of voltage sample circuit 7 and the input of current sampling circuit (8); The input of the output linking number word signal processor (16) of voltage sample circuit (7); The input of the output linking number word signal processor (16) of current sampling circuit (8); The output of the output of under-voltage protecting circuit (13), current foldback circuit (14) all connects the input of pwm control circuit (12); The output of pwm control circuit (12) connects the input of drive circuit (15); The output of drive circuit (15) connects the input of high frequency inverter (4); The output of signal input circuit (9) connects the input of signal isolation circuit (10); The output of signal isolation circuit (10) connects the input that gate is controlled circuit (11); Gate is controlled the input of the output connection pwm control circuit (12) of circuit (11).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310593918.7A CN103618463A (en) | 2013-11-23 | 2013-11-23 | Wideband low-distortion combined three-phase inverter |
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| CN201310593918.7A CN103618463A (en) | 2013-11-23 | 2013-11-23 | Wideband low-distortion combined three-phase inverter |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1243254A (en) * | 1999-08-16 | 2000-02-02 | 国家电力公司武汉高压研究所 | Isofrequency measuring method for earth resistance and apparatus thereof |
| US20070030708A1 (en) * | 2005-08-02 | 2007-02-08 | Lixiang Wei | Compensator with filter for use with a three-phase drive powering a one-phase load |
| CN201663548U (en) * | 2010-04-20 | 2010-12-01 | 解海龙 | High-power intelligent high-frequency switch power supply based on DSP (Digital Signal Processing) technology |
| CN201856022U (en) * | 2010-07-02 | 2011-06-08 | 广东火电工程总公司 | Soft switching IGBT double-inverter type square wave AC-DC (Alternating Current-Direct Current) tungsten-inert-gas welding power source |
| CN102386661A (en) * | 2011-12-07 | 2012-03-21 | 中国人民解放军总装备部军械技术研究所 | Portable electrifying, charging and discharging equipment for photoelectric device |
| CN202737744U (en) * | 2012-08-31 | 2013-02-13 | 山西平阳重工机械有限责任公司 | Comprehensive control device for inversion power supply of large power oxygen-hydrogen generator |
| CN203590044U (en) * | 2013-11-23 | 2014-05-07 | 国家电网公司 | Wideband low-distortion combined three-phase inverter device |
-
2013
- 2013-11-23 CN CN201310593918.7A patent/CN103618463A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1243254A (en) * | 1999-08-16 | 2000-02-02 | 国家电力公司武汉高压研究所 | Isofrequency measuring method for earth resistance and apparatus thereof |
| US20070030708A1 (en) * | 2005-08-02 | 2007-02-08 | Lixiang Wei | Compensator with filter for use with a three-phase drive powering a one-phase load |
| CN201663548U (en) * | 2010-04-20 | 2010-12-01 | 解海龙 | High-power intelligent high-frequency switch power supply based on DSP (Digital Signal Processing) technology |
| CN201856022U (en) * | 2010-07-02 | 2011-06-08 | 广东火电工程总公司 | Soft switching IGBT double-inverter type square wave AC-DC (Alternating Current-Direct Current) tungsten-inert-gas welding power source |
| CN102386661A (en) * | 2011-12-07 | 2012-03-21 | 中国人民解放军总装备部军械技术研究所 | Portable electrifying, charging and discharging equipment for photoelectric device |
| CN202737744U (en) * | 2012-08-31 | 2013-02-13 | 山西平阳重工机械有限责任公司 | Comprehensive control device for inversion power supply of large power oxygen-hydrogen generator |
| CN203590044U (en) * | 2013-11-23 | 2014-05-07 | 国家电网公司 | Wideband low-distortion combined three-phase inverter device |
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Application publication date: 20140305 |