CN102255312A - Method for inhibiting switch burrs of back-to-back harmonic source - Google Patents
Method for inhibiting switch burrs of back-to-back harmonic source Download PDFInfo
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- CN102255312A CN102255312A CN2011101782089A CN201110178208A CN102255312A CN 102255312 A CN102255312 A CN 102255312A CN 2011101782089 A CN2011101782089 A CN 2011101782089A CN 201110178208 A CN201110178208 A CN 201110178208A CN 102255312 A CN102255312 A CN 102255312A
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000002401 inhibitory effect Effects 0.000 title abstract 4
- 238000006243 chemical reaction Methods 0.000 claims abstract description 9
- 230000003111 delayed effect Effects 0.000 claims abstract description 3
- 230000005764 inhibitory process Effects 0.000 claims description 7
- 239000003990 capacitor Substances 0.000 claims description 5
- 230000001934 delay Effects 0.000 claims description 2
- 230000002238 attenuated effect Effects 0.000 abstract 1
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- 238000001914 filtration Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
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- 238000010616 electrical installation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- 230000001052 transient effect Effects 0.000 description 1
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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
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The invention discloses a method for inhibiting switch burrs of a back-to-back harmonic source. In a PWM (Pulse-Width Modulation) control mode of the harmonic source and a feedback link, triangle carrier phases input by the harmonic source and the feedback link are delayed in 180 DEG in the process of carrying out PWM conversion on control current of a main circuit; and a purpose of inhibiting switch frequency burrs of harmonic current at an input power supply side is achieved. The method for inhibiting the switch burrs of the back-to-back harmonic source, disclosed by the invention, is simple and easy to operate. The amplitude value of the switch frequency burrs of the harmonic current at the back-to-back harmonic source input side can be attenuated effectively.
Description
Technical field
The present invention relates to a kind of inhibition method of harmonic source switch burr back-to-back, this method can effectively suppress the switch burr of harmonic source input mains side harmonic current, belongs to Harmonious Waves in Power Systems and suppresses the field.
Background technology
The system that is meant surge impact in the electrical network takes place to cross (low) voltage in short-term, and promptly the time is no more than 1 millisecond voltage transient pulse, and this pulse can be positive polarity or negative polarity, can have consecutive or vibration character.They also are called usually: spike, breach, interference, burr or sudden change.Surge impact in the electrical network both can be caused by the switching or the cut-offfing of large-scale thyristor of the inner main equipment of electrical network (motor, capacitor etc.), also can be caused by the intrusion of outside lightning wave.In recent years, rectifier and inverter applications are extensive day by day, have become the main cause of surge impact and resonance, as frequency control drive system, uninterrupted power supply electric power system (UPS), low voltage frequency converter etc.Rectifier and inverter are the solid-state switching circuits of a series of complexity, at first from AC side one mutually current drawn, forward next phase then to, constantly circulation, give same output lead power supply successively, when electric current is transformed into another phase time from a phase conductor, two phase conductors are in short-circuit condition substantially, though short-circuit condition only continues several milliseconds of zero points, cause spike and serrated pulse surge to disturb.
Surge impact causes that easily electronic equipment part damages, and causes that insulation of electrical installation punctures, and also causes device data such as computer to make mistakes or crash simultaneously easily.Bring up to 2.2-2.5 times or higher based on the multiple of selecting for use fuse on this engineering, be not damaged to guarantee capacitor and contactor.Moment spike interference for the suppression capacitor installation place, usual way is at close sensitive equipment place, insert a certain amount of inductance or inhibitor in parallel is installed, if a certain circuit self does not have enough inductance, then can augment with screwed pipe shape choking-winding, in order to obtain better effect, just should adopt filter.
Summary of the invention
The object of the invention is to provide a kind of inhibition method of harmonic source switch burr back-to-back, by can effectively the decay amplitude of switch burr of some frequency of the phase place time-delay that changes triangular carrier.
Inhibition of the present invention is the method for harmonic source switch burr back-to-back, in the PWM control mode of harmonic source and feedback link, the triangular carrier phase place that both are imported is delayed time 180 °, reaches the purpose that suppresses input mains side harmonic current switch burr.The method that the present invention suppresses harmonic source switch burr back-to-back is simple, easy to operate, but the effective attenuation amplitude of the switch burr of some frequency of harmonic source input side harmonic current back-to-back.
Description of drawings
Fig. 1 is the main circuit structure schematic diagram of harmonic source back-to-back.
Fig. 2 is feedback link control principle figure.
Fig. 3 is harmonic source control principle figure.
Fig. 4 is the harmonic current waveform when zero for the PWM control intermediate cam carrier phase of harmonic source and feedback link is.
The spectrogram of Fig. 5 harmonic current when zero for the PWM control intermediate cam carrier phase of harmonic source and feedback link is.
Harmonic current waveform when Fig. 6 differs 180 ° for the PWM of harmonic source and feedback link controls the intermediate cam carrier phase.
The spectrogram of the harmonic current when Fig. 7 differs 180 ° for the PWM of harmonic source and feedback link controls the intermediate cam carrier phase.
Embodiment
The invention provides a kind of inhibition method of harmonic source switch burr back-to-back, by the emulation experiment of this method having been verified the validity and the reasonability of institute's extracting method.Below in conjunction with accompanying drawing, technical solution of the present invention is elaborated.
The main circuit structure of harmonic source such as accompanying drawing 1 comprise harmonic source, feedback link, intermediate dc electric capacity back-to-back, control terminal, a LCL filtering link and the 2nd LCL filtering link.Described control terminal adopts dsp controller to realize, sets the generation control signal according to the user, and the control harmonic source partly produces current disturbing.Harmonic source passes through the cascade mutually of intermediate dc electric capacity with the feedback link, forms the topological structure of formula back-to-back of AC-DC-AC, realizes the energy feedback; Described harmonic source and feedback link adopt the three-phase PWM current transformer to realize, the PWM control mode of feedback link adopts the triangular wave manner of comparison, and command signal is by load current
i L The active current stable with keeping dc capacitor voltage is formed by stacking, as shown in Figure 2.Actual feedback waveform as feedback signal, carry out proportional integral after command signal deducted feedback signal, obtain the Control current of main circuit, this Control current is carried out after the PWM conversion adopting triangular wave to modulate the control signal that obtains IGBT as carrier wave in the PWM conversion as the control signal of main circuit switch device; The PWM control mode of harmonic source also adopts the triangular wave manner of comparison, control terminal produces command signal according to setting, actual current waveform as feedback signal, carry out proportional integral after command signal deducted feedback signal, as the control signal of main circuit switch device, control mode is seen shown in the accompanying drawing 3.
In the pwm control signal production process of harmonic source and feedback link, if make waveform that both triangular carrier phase place time-delays are 0 ° of input side harmonic current that obtains as shown in Figure 4, the harmonic current waveform is carried out spectrogram such as the accompanying drawing 5 that the FFT conversion obtains harmonic current, the switch burr that can see harmonic current this moment is more, and the maximum amplitude of 10kHz place harmonic current burr is 0.46A; When carrying out the PWM conversion, produce the triangular carrier and 180 ° of the triangular carrier phase delays that produces feedback link control signal of harmonic source control signal, reach the purpose that suppresses harmonic current switch burr.The waveform of the input side harmonic current that obtains as shown in Figure 6, the harmonic current waveform is carried out spectrogram such as the accompanying drawing 7 that the FFT conversion obtains harmonic current, can see that the switch burr of harmonic current this moment compares obviously with accompanying drawing 4 and reduce, can see that by spectrogram the maximum amplitude of 10kHz place harmonic current burr is reduced to 0.17A.
Claims (3)
1. one kind is suppressed the method for harmonic source switch burr back-to-back, it is characterized in that: in the PWM control mode of harmonic source and feedback link, the triangular carrier phase place that both are imported is delayed time 180 °, reaches the purpose of the switch burr that suppresses input mains side harmonic current.
2. a kind of inhibition according to claim 1 is the method for harmonic source switch burr back-to-back, it is characterized in that, PWM control method to harmonic source and feedback link main circuit is: with the example that is controlled to be of feedback link, as shown in Figure 2, with command signal by load current
i L The active current stable with keeping dc capacitor voltage is formed by stacking, actual feedback waveform as feedback signal, carry out proportional integral after command signal deducted feedback signal, obtain the Control current of main circuit, this Control current is carried out after the PWM conversion adopting triangular wave to modulate the control signal that obtains IGBT as carrier wave in the PWM conversion as the control signal of main circuit switch device.
3. a kind of inhibition according to claim 1 is the method for harmonic source switch burr back-to-back, it is characterized in that, when carrying out the PWM conversion, produce the triangular carrier and 180 ° of the triangular carrier phase delays that produces feedback link control signal of harmonic source control signal, reach the purpose that suppresses harmonic current switch burr.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101782089A CN102255312A (en) | 2011-06-29 | 2011-06-29 | Method for inhibiting switch burrs of back-to-back harmonic source |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101782089A CN102255312A (en) | 2011-06-29 | 2011-06-29 | Method for inhibiting switch burrs of back-to-back harmonic source |
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| CN102255312A true CN102255312A (en) | 2011-11-23 |
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| CN2011101782089A Pending CN102255312A (en) | 2011-06-29 | 2011-06-29 | Method for inhibiting switch burrs of back-to-back harmonic source |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101051792A (en) * | 2006-02-15 | 2007-10-10 | 洛克威尔自动控制技术股份有限公司 | Nine device AC-to-AC converter |
| CN201323531Y (en) * | 2008-12-29 | 2009-10-07 | 郑州电力机械厂 | 6KV high-voltage transducer directly composed of three-level H-bridge power unit module |
| CN101682192A (en) * | 2007-04-27 | 2010-03-24 | Abb技术有限公司 | Method and system to influence the power generation of an adjustable speed generator |
| CN101931240A (en) * | 2010-08-26 | 2010-12-29 | 哈尔滨九洲电气股份有限公司 | Double-PWM vector control double-fed wind power converter |
-
2011
- 2011-06-29 CN CN2011101782089A patent/CN102255312A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101051792A (en) * | 2006-02-15 | 2007-10-10 | 洛克威尔自动控制技术股份有限公司 | Nine device AC-to-AC converter |
| CN101682192A (en) * | 2007-04-27 | 2010-03-24 | Abb技术有限公司 | Method and system to influence the power generation of an adjustable speed generator |
| CN201323531Y (en) * | 2008-12-29 | 2009-10-07 | 郑州电力机械厂 | 6KV high-voltage transducer directly composed of three-level H-bridge power unit module |
| CN101931240A (en) * | 2010-08-26 | 2010-12-29 | 哈尔滨九洲电气股份有限公司 | Double-PWM vector control double-fed wind power converter |
Non-Patent Citations (2)
| Title |
|---|
| 姜艳姝，徐殿国，赵洪，刘宇: "多电平SPWM变频器中共模电压抑制技术的研究", 《中国电机工程学报》 * |
| 罗文广，张志学: "背靠背四象限变流器控制方法的研究", 《大功率变流技术》 * |
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Owner name: STATE ELECTRIC NET CROP. Effective date: 20130130 |
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Effective date of registration: 20130130 Address after: 230601 Anhui Road, Hefei, No. 299 Ziyun Road Applicant after: Anhui Academy of Electric Power Sciences Applicant after: State Grid Corporation of China Address before: 230601 Anhui Road, Hefei, No. 299 Ziyun Road Applicant before: Anhui Academy of Electric Power Sciences |
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Application publication date: 20111123 |