CN103326600B - A kind of frequency converter is used without harmonic wave rectification device - Google Patents
A kind of frequency converter is used without harmonic wave rectification device Download PDFInfo
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- CN103326600B CN103326600B CN201210074142.3A CN201210074142A CN103326600B CN 103326600 B CN103326600 B CN 103326600B CN 201210074142 A CN201210074142 A CN 201210074142A CN 103326600 B CN103326600 B CN 103326600B
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- 239000003990 capacitor Substances 0.000 claims abstract description 14
- 238000009499 grossing Methods 0.000 claims abstract description 9
- 238000005070 sampling Methods 0.000 claims description 20
- 230000001681 protective effect Effects 0.000 claims description 14
- 238000006243 chemical reaction Methods 0.000 claims description 10
- 238000011217 control strategy Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 238000004146 energy storage Methods 0.000 claims description 3
- 238000012806 monitoring device Methods 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 2
- 238000013461 design Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
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- 238000005538 encapsulation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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Abstract
The present invention relates to a kind of frequency converter without harmonic wave rectification device, described frequency converter comprises smoothing reactor and DC capacitor group, described frequency converter is connected with electric power system, described rectifying device comprises main circuit and control circuit, the input of described main circuit connects the smoothing reactor of frequency converter, output connects the DC capacitor group of frequency converter, described control circuit is connected with main circuit and electric power system respectively, described control circuit gathers the current signal of electric power system and the voltage signal of main circuit DC side, control signal is exported after signal is processed, this control signal controls main circuit and carries out energy exchange with the sine poower flow of fundamental phase and electric power system.Compared with prior art, the present invention has and does not produce harmonic wave, do not produce reactive power, can send the advantages such as energy to electric power system is counter.
Description
Technical field
The present invention relates to a kind of rectifying device, especially relate to a kind of frequency converter without harmonic wave rectification device.
Background technology
Along with the development of modern industry and the raising of living standards of the people, also more and more higher to the requirement of the quality of power supply.Therefore the task of top priority that power supply quality becomes power department is improved constantly.Harmonic content weighs the important indicator of Economical Operation of Power Systems.
Modern frequency converter generally uses the pattern handing over orthogonal, is first DC power supply by the AC power rectification of system, then direct current is converted to alternating current again by inversion transformation technique.Harmonic wave produces in first rectification link, because present frequency converter generally adopts 6 pulse-phase rectifier bridges so the input harmonics of frequency convertor system side is generally the characteristic harmonics of 6N ± 1 time, along with the characteristic harmonics of the fluctuation frequency converter input side of load power consumption also can change harmonic characterisitic because of the consumption of non-linear electricity consumption, along with the use of frequency converter is popularized, the harmonic wave control problem of frequency converter is more aobvious outstanding.
The method of the harmonic carcellation generally adopted in current industry is installed in parallel active power filter in frequency converter side, although this method can suppress the harmonic current of frequency converter effectively, but the larger cost of the volume of active power filter itself is higher, be unfavorable for installing active power filter additional before each frequency converter from the aspect of Engineering operation.
Summary of the invention
Object of the present invention be exactly provide to overcome defect that above-mentioned prior art exists a kind of without harmonic wave, can by the frequency converter that instead for dump power send system, there is energy-saving effect without harmonic wave rectification device.
Object of the present invention can be achieved through the following technical solutions: a kind of frequency converter is without harmonic wave rectification device, described frequency converter comprises smoothing reactor and DC capacitor group, described frequency converter is connected with electric power system, it is characterized in that, described rectifying device comprises main circuit and control circuit, the input of described main circuit connects the smoothing reactor of frequency converter, output connects the DC capacitor group of frequency converter, described control circuit is connected with main circuit and electric power system respectively, described control circuit gathers the current signal of electric power system and the voltage signal of main circuit DC side, control signal is exported after signal is processed, this control signal controls main circuit and carries out energy exchange with the sine poower flow of fundamental phase and electric power system.
Described main circuit is the controlled IGBT commutating circuit of 6 brachium pontis.
Described control circuit comprises control power supply, sampling circuit, control loop, drive circuit and protective loop, the input of described sampling circuit is connected with electric power system and main circuit respectively, output is connected with control loop, described control loop connects drive circuit and protective loop respectively, described drive circuit is all connected main circuit with protective loop, the voltage signal of described sampling circuit to the current signal of the electric power system collected and main circuit DC side is modulated, amplify and conversion process, signal is converted into the discernible analog signal of control loop, control loop sends control signal and controls main circuit, drive circuit and protective loop.
Described sampling circuit comprise connect successively transducer, sampling modulation circuit, operational amplifier and AD conversion chip, described sensor input connects main circuit and electric power system respectively, described transducer gathers the current signal of electric power system and the voltage signal of main circuit DC side, and this signal is successively by being converted to digital data transmission to control loop after sampling modulation circuit, operational amplifier and AD conversion chip.
Described control loop comprises dsp chip, and described dsp chip is connected with AD conversion chip.
The operating state of described protective loop monitoring device also provides protecting control in real time.
Compared with prior art, the present invention has the following advantages:
1) the best power stream sineization control strategy of original creation is adopted: this control strategy leads to the overpowering flow direction and the energy needed for frequency converter is all decomposed into meritorious (actual power required for load) and inverse merit (the anti-power delivering to frequency converter of load), when analyzing meritorious, all energy are all mapped to first-harmonic acting energy by algorithm, regard the DC energy storage source of frequency converter for power source as and send energy (control strategy as shown in Figure 4) with the pattern of fundamental voltage to system is counter when analyzing inverse merit.
2) the minimized system reform: original rectifier diode is just become IGBT rectifier bridge from main circuit structure by the present invention, the working method original for frequency converter does not need to make any adjustments, to frequency converter, it can ignore the existence of IGBT rectifier bridge completely itself, concerning existing frequency converter producer they without the need to making any adjustments the control strategy of oneself; From the appearance for just rectifier bridge being become IPM module, under Same Efficieney, both volumes are almost consistent with heating power, and that is user is without the need to carrying out extra structural design and thermal design just can directly use to product; Control section of the present invention is independent design of installing, and user only needs it as a unit and IPM model calling; Be the smoothing reactor of frequency converter self due to energy storage source of the present invention and for what directly adopt with the energy alternative source of system, coupled, what change is add one group of control module for unique frequency converter.
3) do not produce harmonic wave in the process of the use of frequency converter, do not produce idle: because the best power stream sineization control strategy that have employed original creation makes frequency converter can not produce harmonic wave in the process of work, also can not produce idle simultaneously.
4) inverse merit occurs: counter for the motor power inverting sent can be returned system in use procedure of the present invention, as anti-power delivery can be returned frequency converter by elevator load in the situations such as braking, and the storage capacitor voltage of frequency converter inside is raised, traditional frequency converter generally adopts discharge resistance to fall to ensure the normal work of equipment by unnecessary power consumption, after employing this device, frequency converter special front end rectifying device can send this part energy back to system so that the form of inverse merit is counter, counter send energy in due to adopt remain best power stream sineization control strategy, the inverse merit sent so counter is also do not produce harmonic wave not produce and idle deposit pure 50HZ sine energy and exchange.
5) acp chip is powerful: the present invention adopt the most modern microprocessor and and Digital Signal Processing, the data processing function of dsp chip is powerful, computation and analysis can be carried out to sampled data rapidly, and data in enormous quantities can be processed simultaneously.
Accompanying drawing explanation
Fig. 1 is the structural representation of main circuit of the present invention;
Fig. 2 is the structural representation of control circuit of the present invention;
Fig. 3 is workflow diagram of the present invention;
Fig. 4 is best power stream sineization control strategy function diagram of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment
As Fig. 1, shown in Fig. 2, a kind of frequency converter is used without harmonic wave rectification device, frequency converter comprises smoothing reactor 2 and DC capacitor group 3, frequency converter is connected with electric power system, it is characterized in that, rectifying device comprises main circuit 1 and control circuit, the input of main circuit 1 connects the smoothing reactor 2 of frequency converter, output connects the DC capacitor group 3 of frequency converter, control circuit is connected with main circuit 1 and electric power system respectively, main circuit 1 is the controlled IGBT commutating circuit of 6 brachium pontis, when all 6 groups of drive circuits whole out-of-work time, this rectifying device becomes again 6 traditional pulse-phase rectifier bridges.
Control circuit comprises control power supply 4, sampling circuit 5, control loop 6, drive circuit 7 and protective loop 8; the input of sampling circuit 4 is connected with main circuit 1; output is connected with control loop 5; control loop 5 connects drive circuit 7 and protective loop 8 respectively, and drive circuit 7 is all connected main circuit 1 with protective loop 8.Sampling circuit 4 comprise connect successively transducer, sampling modulation circuit, operational amplifier and AD conversion chip, it is high that this loop has sampling precision, dynamic range is large, the advantages such as job stability is strong, transducer in loop adopts Hall type sensor, sampling precision is high, and frequency characteristic is good, can catch DC component.Control loop 5 comprises dsp chip and peripheral control logic, the TMS320F28335 series of high speed floating-point signal processor of American TI Company that what dsp chip wherein adopted is, peripheral control logic is made up of general digital gate circuit, and control loop of the present invention has the fast operation operating accuracy height reaction advantage such as quick.Drive circuit 7 drives IGBT to work, and this drive circuit works is stablized, and reliability is strong, effectively can protect IGBT module.The operating state of protective loop 8 monitoring device also provides protecting control in real time.
The IPM module of what the controlled IGBT commutating circuit of the present invention 6 brachium pontis adopted is MIT, it is lower to compare traditional IGBT module loss when IPM module is the IGBT module overall work of encapsulation.
The present invention is directly integrating use with frequency converter, the DC diode of frequency converter is replaced with IPM module to install on a heat sink, need in addition a set of special control circuit module to be installed at box house, this control circuit module has 4 groups of input ports of sampling, and is A phase current input sample, B phase current input sample, C phase current input sample and DC voltage sampling input respectively.Voltage sample instrument transformer is integrated in the inside of module, only need by direct for the voltage signal of DC side access module; The output signal that current transformer is arranged on this control module has 6 groups of different IPM to trigger drive singal.
Be illustrated in figure 3 workflow diagram of the present invention, specific as follows:
The DC capacitor group being first frequency converter inside by precharge loop after device power carries out soft charging, and the instantaneous charging of anti-locking apparatus when powering on due to capacitance group brings impact to power electronic equipment; Equipment investment pre-charge resistance after charging arrives formulation voltage, and the DC capacitor group operating voltage stablizing frequency converter according to poower flow sineization strategy.After frequency converter starts output current, the capacity required for load is supplied to load by inner inversion circuit by DC capacitor group, now the voltage of DC side is inherently because the loss of energy causes Voltage Drop, and this lacked part energy is carried out energy exchange with the sine wave of system voltage homophase and system and supplemented DC bus capacitor group voltage drop just operationally by frequency converter special front end rectifying device; When load because braking, reverse can situation when causing that energy is counter to be sent the voltage of DC side can improve voltage because of the absorption of energy; Because DC bus capacitor group generally has safe voltage value so now frequency converter special front end rectifying device can by counter for the load energy another mistake change meeting system sent.This sinusoidal power stream repeatedly alternately ensure that frequency converter operationally can not produce reactive current and harmonic current.
The energy that the present invention really can realize frequency converter is evolved, and guarantees that frequency converter can exchange with the energy of sine wave and system at arbitrary operation time.The present invention, as the intelligent switch device of a kind of advanced person, can be applied to the frequency converter front end of all size, and when selector, the current class of power power electronic switching device of the present invention is because of consistent with the current class of frequency converter.
Claims (6)
1. a frequency converter is used without harmonic wave rectification device, described frequency converter comprises smoothing reactor and DC capacitor group, described frequency converter is connected with electric power system, it is characterized in that, described rectifying device comprises main circuit and control circuit, the input of described main circuit connects the smoothing reactor of frequency converter, output connects the DC capacitor group of frequency converter, described control circuit is connected with main circuit and electric power system respectively, described control circuit gathers the current signal of electric power system and the voltage signal of main circuit DC side, control signal is exported after signal is processed, this control signal controls main circuit and carries out energy exchange with the sine poower flow of fundamental phase and electric power system,
This rectifying device adopts best power stream sineization control strategy: this control strategy leads to the overpowering flow direction and the energy needed for frequency converter is all decomposed into meritorious and inverse merit, the actual power of wherein gaining merit required for load, inverse merit is the anti-power delivering to frequency converter of load, when analyzing meritorious, all energy are all mapped to first-harmonic acting energy by algorithm, regard the DC energy storage source of frequency converter for power source as and send energy with the pattern of fundamental voltage to system is counter when analyzing inverse merit.
2. a kind of frequency converter according to claim 1 is without harmonic wave rectification device, it is characterized in that, described main circuit is the controlled IGBT commutating circuit of 6 brachium pontis.
3. a kind of frequency converter according to claim 1 is without harmonic wave rectification device, it is characterized in that, described control circuit comprises control power supply, sampling circuit, control loop, drive circuit and protective loop, the input of described sampling circuit is connected with electric power system and main circuit respectively, output is connected with control loop, described control loop connects drive circuit and protective loop respectively, described drive circuit is all connected main circuit with protective loop, the voltage signal of described sampling circuit to the current signal of the electric power system collected and main circuit DC side is modulated, amplify and conversion process, signal is converted into the discernible analog signal of control loop, control loop sends control signal and controls main circuit, drive circuit and protective loop.
4. a kind of frequency converter according to claim 3 is without harmonic wave rectification device, it is characterized in that, described sampling circuit comprise connect successively transducer, sampling modulation circuit, operational amplifier and AD conversion chip, described sensor input connects main circuit and electric power system respectively, described transducer gathers the current signal of electric power system and the voltage signal of main circuit DC side, and this signal is successively by being converted to digital data transmission to control loop after sampling modulation circuit, operational amplifier and AD conversion chip.
5. a kind of frequency converter according to claim 4 is without harmonic wave rectification device, it is characterized in that, described control loop comprises dsp chip, and described dsp chip is connected with AD conversion chip.
6. a kind of frequency converter according to claim 3 is without harmonic wave rectification device, it is characterized in that, the operating state of described protective loop monitoring device also provides protecting control in real time.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210074142.3A CN103326600B (en) | 2012-03-19 | 2012-03-19 | A kind of frequency converter is used without harmonic wave rectification device |
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| CN201210074142.3A CN103326600B (en) | 2012-03-19 | 2012-03-19 | A kind of frequency converter is used without harmonic wave rectification device |
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| CN103326600A CN103326600A (en) | 2013-09-25 |
| CN103326600B true CN103326600B (en) | 2015-10-21 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101106338A (en) * | 2006-07-14 | 2008-01-16 | 上海神源电气有限公司 | Bidirectional power flow efficient energy saving converter |
| CN101425756A (en) * | 2008-07-30 | 2009-05-06 | 东元总合科技（杭州）有限公司 | DC lateral voltage controllable 4 quadrant frequency transformer and method thereof |
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2012
- 2012-03-19 CN CN201210074142.3A patent/CN103326600B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101106338A (en) * | 2006-07-14 | 2008-01-16 | 上海神源电气有限公司 | Bidirectional power flow efficient energy saving converter |
| CN101425756A (en) * | 2008-07-30 | 2009-05-06 | 东元总合科技（杭州）有限公司 | DC lateral voltage controllable 4 quadrant frequency transformer and method thereof |
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| CN103326600A (en) | 2013-09-25 |
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Address after: 201108 Shanghai, Minhang District, Hong Jian Road, No. third, building 1, building 99, 2 Applicant after: SHANGHAI LIVESINE ELECTRIC Co.,Ltd. Address before: 200240 C building, No. 4299 Jin Du Road, Shanghai, Minhang District, 1-773 Applicant before: SHANGHAI DOUBLE X TECHNOLOGY Co.,Ltd. |
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Denomination of invention: A non-harmonic rectifier device for frequency converter Effective date of registration: 20220919 Granted publication date: 20151021 Pledgee: Bank of Jiangsu Limited by Share Ltd. Shanghai Changning branch Pledgor: SHANGHAI LIVESINE ELECTRIC Co.,Ltd. Registration number: Y2022310000250 |