CN103326600A - Non-harmonic rectifying device for frequency converter - Google Patents
Non-harmonic rectifying device for frequency converter Download PDFInfo
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- CN103326600A CN103326600A CN2012100741423A CN201210074142A CN103326600A CN 103326600 A CN103326600 A CN 103326600A CN 2012100741423 A CN2012100741423 A CN 2012100741423A CN 201210074142 A CN201210074142 A CN 201210074142A CN 103326600 A CN103326600 A CN 103326600A
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Abstract
The invention relates to a non-harmonic rectifying device for a frequency converter. The frequency converter comprises a smoothing reactor and a direct current capacitor set, and the frequency converter is connected with an electric power system. The rectifying device comprises a main circuit and a control circuit. The input end of the main circuit is connected with the smoothing reactor of the frequency converter, and the output end of the main circuit is connected with the direct current capacitor set of the frequency converter. The control circuit is connected with the main circuit and the electric power system respectively. The control circuit collects current signals of the electric power system and voltage signals on the direct current side of the main circuit, after the signals are processed, control signals are output, and the control signals control the main circuit to conduct energy exchange with the electric power system according to the sine power flow of a fundamental wave phase. Compared with the prior art, the non-harmonic rectifying device for the frequency converter has the advantages that harmonic waves and reactive power are not generated, and energy can be inversely transmitted to the electric power system.
Description
Technical field
The present invention relates to a kind of rectifying device, especially relate to a kind of frequency converter and use without the 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 improve constantly the task of top priority that power supply quality becomes power department.Harmonic content is to weigh the important indicator of Economical Operation of Power Systems.
Modern frequency converter normal operation is handed over the pattern of orthogonal, and the AC power rectification with system is DC power supply first, again direct current is converted to alternating current again by inversion transformation technique.Harmonic wave produces in first rectification link, because so the general input harmonics that adopts 6 pulse-phase rectifier bridge frequency convertor system sides of present frequency converter is generally the characteristic harmonics of 6N ± 1 time, along with the characteristic harmonics of fluctuation frequency converter input side of load power consumption also can change because of the consumption of non-linear electricity consumption harmonic characterisitic, 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 that generally adopts in the industry at present is to be installed in parallel active power filter in the 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, is unfavorable for installing active power filter additional before each frequency converter from the aspect of engineering operation.
Summary of the invention
Purpose of the present invention be exactly provide in order to overcome the defective that above-mentioned prior art exists a kind of without harmonic wave, can instead send system with dump power, frequency converter with energy-saving effect uses without the harmonic wave rectification device.
Purpose of the present invention can be achieved through the following technical solutions: a kind of frequency converter is used without the 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, signal is processed rear output control signal, and this control signal control main circuit carries out energy exchange with the sine power stream of fundamental phase with electric power system.
Described main circuit is the controlled IGBT commutating circuits of 6 brachium pontis.
Described control circuit comprises the control power supply; sampling circuit; control loop; drive loop and protection loop; the input of described sampling circuit is connected with main circuit with electric power system respectively; output is connected with control loop; described control loop connects respectively driving loop and protection loop; described driving loop be connected the loop all to connect main circuit; described sampling circuit is modulated the current signal of the electric power system that collects and the voltage signal of main circuit DC side; amplify and conversion process; signal is converted into the discernible analog signal of control loop, and control loop sends control signal control main circuit; drive loop and protection loop.
Described sampling circuit comprises transducer, sampling modulation circuit, operational amplifier and the AD conversion chip that connects successively, described transducer input connects respectively main circuit and electric power system, 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 behind sampling modulation circuit, operational amplifier and the AD conversion chip.
Described control loop comprises dsp chip, and described dsp chip is connected with the AD conversion chip.
The operating state of described protection loop monitoring device also provides protection control in real time.
Compared with prior art, the present invention has the following advantages:
1) adopt the best power of original creation to flow the sineization control strategy: the logical overpowering flow direction energy that frequency converter is required of this control strategy all is decomposed into meritorious (the needed actual power of load) and contrary merit (the counter power of delivering to frequency converter of load), algorithm all is mapped to first-harmonic acting energy with all energy when meritorious analyzing, when analyzing contrary merit, the dc energy storage source of frequency converter regarded as for power source and with the pattern of fundamental voltage to the anti-energy (control strategy as shown in Figure 4) that send of system.
2) the minimized system reform: the present invention has just become original rectifier diode into the IGBT rectifier bridge from main circuit structure, need not do any adjustment to the working method that frequency converter is original, it can ignore the existence of IGBT rectifier bridge fully itself to frequency converter, and they need not the control strategy of oneself is done any adjustment concerning existing frequency converter producer; From the appearance be used for just rectifier bridge having been become the IPM module, both volumes are almost consistent with heating power under Same Efficieney, that is to say that the user need not just can directly use carrying out extra structural design and thermal design product; Control section of the present invention is independent design of installing, and the user only need to be connected as a unit it and gets final product with the IPM module; Because energy storage of the present invention source and be used for and the energy alternative source of system, coupled directly adopts is the smoothing reactor of frequency converter self, unique change is to have added one group of control module for frequency converter.
3) the best power stream sineization control strategy that has adopted original creation do not produce harmonic wave in the process of the use of frequency converter, do not produce idle: owing to can not produce idle simultaneously so that frequency converter can not produce harmonic wave in the process of work yet.
4) contrary merit occurs: the anti-power inverting that send of motor can be gone back to system in the use procedure of the present invention, load meeting in the situations such as braking returns anti-power delivery to frequency converter such as elevator, and the storage capacitor voltage of frequency converter inside raise, traditional frequency converter generally adopts discharge resistance unnecessary power consumption to be fallen to guarantee the normal operation of equipment, the special-purpose front end rectifying device of frequency converter can be with form counter the send system of this part energy with contrary merit after having used this device, counter send energy in since adopt remain best power stream sineization control strategy, so the anti-contrary merit of sending also is not produce harmonic wave not produce the idle pure 50HZ sine energy exchange of depositing.
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, can calculate and analyze the data of sampling rapidly, and can process simultaneously data in enormous quantities.
Description of drawings
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
The present invention is described in detail below in conjunction with the drawings and specific embodiments.
Embodiment
Such as Fig. 1, shown in Figure 2, a kind of frequency converter is used without the 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 circuits of 6 brachium pontis, and whole out-of-work the time when 6 groups of all drive circuits, this rectifying device has become again 6 traditional pulse-phase rectifier bridges.
Control circuit comprises control power supply 4, sampling circuit 5, control loop 6, drives loop 7 and protection 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 respectively driving loop 7 and protection loop 8, drives loop 7 and is connected loop 8 all to connect main circuit 1.Sampling circuit 4 comprises transducer, sampling modulation circuit, operational amplifier and the AD conversion chip that connects successively, it is high that this loop has a sampling precision, dynamic range is large, the advantages such as job stability is strong, transducer in the loop adopts the Hall type transducer, sampling precision is high, and frequency characteristic is good, can catch DC component.Control loop 5 comprises dsp chip and peripheral control logic, what dsp chip wherein adopted is the TMS320F28335 series of high speed floating-point signal processor of American TI Company, the peripheral control logic is comprised of general digital gate circuit, and control loop of the present invention has the advantages such as the high reaction of fast operation operating accuracy is quick.Drive circuit 7 drives IGBT work, and this drive circuit works is stable, and reliability is strong, can effectively protect the IGBT module.The operating state of protection loop 8 monitoring devices also provides protection control in real time.
What the controlled IGBT commutating circuit of the present invention's 6 brachium pontis adopted is the IPM module of MIT, and it is lower that the IPM module is that the IGBT module whole of encapsulationization is compared traditional IGBT module loss when working.
The present invention is directly integrating use with frequency converter, the DC diode of frequency converter is replaced with the IPM module to be installed on the fin, need to install in addition the special-purpose control circuit module of a cover at box house, this control circuit module has 4 groups of sampling input ports, is respectively A phase current input sample, B phase current input sample, C phase current input sample and dc voltage sampling input.The voltage sample instrument transformer is integrated in the inside of module, only needs the direct access module of the voltage signal of DC side; The output signal that current transformer is installed in this control module has 6 groups of different IPM to trigger the driving signal.
Be illustrated in figure 3 as workflow diagram of the present invention, specific as follows:
Be that the dc capacitor group of frequency converter inside is carried out soft charging by the precharge loop first after the device power, anti-locking apparatus when powering on because the instantaneous charging of capacitance group brings impact to power electronic equipment; Equipment investment pre-charge resistance after charging arrives formulation voltage, and according to the tactful dc capacitor group operating voltage of stablizing frequency converter of power stream sineization.The dc capacitor group offers load with the inversion circuit of the needed capacity of load by inside after frequency converter begins output current, this moment, the voltage of DC side must cause voltage to fall because of the loss of energy, and the special-purpose front end rectifying device of frequency converter carries out energy exchange and the additional dc bus capacitor group voltage drop when working with this part energy of lacking with the sinusoidal wave form of system voltage homophase and system; Can situation cause the voltage of DC side when energy is counter to be sent to improve voltage because of the absorption of energy when load because brake, reverse; So the special-purpose front end rectifying device of frequency converter can be with the anti-energy another mistake change meeting system that send of load at this moment because the dc bus capacitor group generally has the safe voltage value.The frequency converter of repeatedly alternately having guaranteed of this sinusoidal power stream can not produce reactive current and harmonic current when work.
The present invention can realize really that the energy of frequency converter evolves, and guarantees that frequency converter can both exchange with energy and the system of sine wave at operation time arbitrarily.The present invention can be applied to the frequency converter front end of all size as a kind of advanced person's intelligent switch device, and the current class of power electronic power switch device of the present invention is because of consistent with the current class of frequency converter when selector.
Claims (6)
1. a frequency converter is used without the 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, signal is processed rear output control signal, and this control signal control main circuit carries out energy exchange with the sine power stream of fundamental phase with electric power system.
2. a kind of frequency converter according to claim 1 is used without the harmonic wave rectification device, it is characterized in that, described main circuit is the controlled IGBT commutating circuits of 6 brachium pontis.
3. a kind of frequency converter according to claim 1 is used without the harmonic wave rectification device; it is characterized in that; described control circuit comprises the control power supply; sampling circuit; control loop; drive loop and protection loop; the input of described sampling circuit is connected with main circuit with electric power system respectively; output is connected with control loop; described control loop connects respectively driving loop and protection loop; described driving loop be connected the loop all to connect main circuit; described sampling circuit is modulated the current signal of the electric power system that collects and the voltage signal of main circuit DC side; amplify and conversion process; signal is converted into the discernible analog signal of control loop, and control loop sends control signal control main circuit; drive loop and protection loop.
4. a kind of frequency converter according to claim 3 is used without the harmonic wave rectification device, it is characterized in that, described sampling circuit comprises transducer, sampling modulation circuit, operational amplifier and the AD conversion chip that connects successively, described transducer input connects respectively main circuit and electric power system, 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 behind sampling modulation circuit, operational amplifier and the AD conversion chip.
5. a kind of frequency converter according to claim 4 is used without the harmonic wave rectification device, it is characterized in that, described control loop comprises dsp chip, and described dsp chip is connected with the AD conversion chip.
6. a kind of frequency converter according to claim 3 is used without the harmonic wave rectification device, it is characterized in that, the operating state of described protection loop monitoring device also provides protection control in real time.
Priority Applications (1)
| 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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| Application Number | Priority Date | Filing Date | Title |
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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 true CN103326600A (en) | 2013-09-25 |
| CN103326600B 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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| CN103326600B (en) | 2015-10-21 |
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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 |