CN104660023A - Direct current bus discharge method and device for fan converter - Google Patents
Direct current bus discharge method and device for fan converter Download PDFInfo
- Publication number
- CN104660023A CN104660023A CN201510095215.0A CN201510095215A CN104660023A CN 104660023 A CN104660023 A CN 104660023A CN 201510095215 A CN201510095215 A CN 201510095215A CN 104660023 A CN104660023 A CN 104660023A
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- China
- Prior art keywords
- fan converter
- frequency
- voltage source
- bus
- converter
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/322—Means for rapidly discharging a capacitor of the converter for protecting electrical components or for preventing electrical shock
Abstract
The invention discloses a direct current bus discharge method and device for a fan converter. The method comprises steps as follows: after the fan converter halts, whether the fan converter is separated from a power grid is judged; if yes, the fan converter is restarted; the restarted fan converter is controlled to work in an inverting voltage source mode; the frequency of an inverting voltage source is set according to the frequency of the current power grid; direct current bus voltage of the fan converter is acquired; after the direct current bus voltage is reduced to safety voltage, the fan converter is controlled to stop working, so that direct current bus discharge of the fan converter is realized on the premise that a hardware circuit is not increased.
Description
Technical field
The present invention relates to electric and electronic technical field, more particularly, relate to a kind of fan converter DC bus charging method and device.
Background technology
Existing fan converter many employings voltage mode control, utilizes dc-link capacitance to carry out energy exchange.For meeting the stability of fan converter control and the requirement to dc-link capacitance ripple current; the capacitance of dc-link capacitance all can be chosen larger; so after fan converter is shut down; if do not discharged to fan converter DC bus; DC bus will certainly be caused charged for a long time, be unfavorable for very much the regular maintenance of fan converter.
Therefore, existing fan converter is equipped with special DC bus discharge circuit usually, but owing to adding hardware circuit, adds cost on the one hand, too increases fault point on the other hand.
Summary of the invention
In view of this, the invention provides a kind of fan converter DC bus charging method and device, to realize under the prerequisite not increasing hardware circuit, fan converter DC bus is discharged.
A kind of fan converter DC bus charging method, comprising:
After fan converter is shut down, judge whether fan converter departs from electrical network;
After judgement obtains fan converter and electrical network departs from, restart fan converter;
Control the fan converter after starting and be operated in inverter voltage source module, the frequency of the frequency foundation current electric grid in inverter voltage source sets;
Obtain the DC bus-bar voltage of fan converter;
After described DC bus-bar voltage drops to safe voltage, control fan converter and quit work.
Wherein, the frequency of the frequency foundation current electric grid in described inverter voltage source sets, and comprising: the frequency in setting inverter voltage source equals the frequency of current electric grid.
Wherein, under described inverter voltage source module, slowly increase the inverter voltage Setting signal of fan converter.
A kind of fan converter DC bus electric discharge device, comprising:
Off-grid judging unit, for after fan converter is shut down, judges whether fan converter departs from electrical network;
Start control unit, for after judgement obtains fan converter and electrical network departs from, restart fan converter; And the fan converter controlled after startup is operated in inverter voltage source module, the frequency of the frequency foundation current electric grid in inverter voltage source sets;
Shut down control unit, for obtaining the DC bus-bar voltage of fan converter; And after described DC bus-bar voltage drops to safe voltage, control fan converter and quit work.
Wherein, described startup control unit is the unit of frequency as the frequency in inverter voltage source equaling current electric grid using size.
Wherein, described startup control unit is under described inverter voltage source module, slowly increases the unit of the inverter voltage Setting signal of fan converter.
As can be seen from above-mentioned technical scheme; the present invention is after fan converter off-grid being detected; restart fan converter; it is made to be operated in inverter voltage source module; due to switching loss and inductance, capacity loss can be produced during fan converter inversion; consume the energy that DC bus is accumulated; DC bus-bar voltage is declined; therefore after detecting that DC bus-bar voltage drops to safe voltage; fan converter can be controlled shut down; thus achieve under the prerequisite additionally not increasing hardware circuit, to the object of fan converter DC bus electric discharge.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of fan converter DC bus charging method flow chart disclosed in the embodiment of the present invention;
Fig. 2 is a kind of fan converter topological structure schematic diagram disclosed in prior art;
Fig. 3 is a kind of inverter voltage Setting signal curve chart disclosed in the embodiment of the present invention;
Fig. 4 is a kind of fan converter DC bus electric discharge device structural representation disclosed in the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
See Fig. 1, the embodiment of the invention discloses a kind of fan converter DC bus charging method, to realize under the prerequisite not increasing hardware circuit, to the electric discharge of fan converter DC bus, comprising:
Step 101: after fan converter is shut down, judge whether fan converter departs from electrical network, after judgement obtains fan converter and electrical network departs from, enters step 102; Otherwise return step 101;
Step 102: restart fan converter;
Step 103: control the fan converter after starting and be operated in inverter voltage source module, the frequency of the frequency foundation current electric grid in inverter voltage source sets;
Step 104: the DC bus-bar voltage obtaining fan converter;
Step 105: judge whether the DC bus-bar voltage of fan converter drops to safe voltage, after the DC bus-bar voltage judging to obtain fan converter drops to safe voltage, enters step 106; Otherwise return step 103;
Step 106: control fan converter and quit work.
Wherein, so-called safe voltage, refers to the voltage series in order to prevent electric shock accidents from being adopted by particular power source power supply station.Safe voltage should meet following three conditions: 1, nominal voltage is no more than and exchanges 50V, direct current 120V; 2, powered by safety isolating transformer; 3, safe voltage circuit is isolated with power supply circuits and the earth.
" safety extra low voltage " of general environment conditions permit continuous contact is 50V.
In order to the technical scheme described in clearer explanation the present embodiment, below this programme is described in detail.
Fig. 2 shows a kind of existing fan converter topological structure, and the AC of this fan converter connects motor, and access electrical network through circuit breaker K, the dc-link capacitance of fan converter inside, filter inductance, filter capacitor use C respectively simultaneously
dc, L, C indicate.Fan converter has inverter mode (being again inverter voltage source module) and rectification mode two kinds of mode of operations, after fan converter is shut down, can control circuit breaker K thereupon disconnect, fan converter and electrical network are departed from.Wherein, fan converter whether off-grid can judge according to the on off operating mode of circuit breaker K.
The present embodiment is after judgement fan converter off-grid, again start this fan converter, it is made to be operated in inverter voltage source module, the inverter voltage produced is added in filter capacitor C two ends, and the current flowing path that fan converter is inscribed when a certain inversion is see Fig. 2 (arrow points represents the sense of current).Because now fan converter is restarted in off-grid situation, the situation of pouring in down a chimney energy from electrical network to DC bus therefore can not be there is.
Loss can be produced when fan converter after startup works under inverter voltage source module, comprise switching loss and filter inductance L, filter capacitor C loss, thus certain consumption is caused to the energy that DC bus is accumulated, DC bus-bar voltage is reduced gradually, so DC bus-bar voltage (i.e. dc-link capacitance C detected
dcboth end voltage) drop to safe voltage after, then control fan converter shut down, put DC side electric charge without the need to unloading by extra hardware circuit more at all.
Compared to prior art, the present embodiment does not change the intrinsic hardware circuit topology of fan converter, do not increase extra hardware circuit, only realize fan converter DC bus discharging function by increasing a software control logic, provide cost savings on the one hand, also can not increase new fault point on the other hand.
Wherein, for ensureing the stability that fan converter works under inverter voltage source module, the frequency in inverter voltage source should set according to the frequency of current electric grid (frequency of conventional electrical network is 50Hz/60Hz).That is, the frequency size in setting inverter voltage source equals or close to the frequency (allowing certain error) of current electric grid, ensures that the fan converter after restarting is operated in the frequency range that can bear.
In addition it should be noted that, under described inverter voltage source module, slowly should increase the inverter voltage Setting signal of fan converter, thus the voltage at filter capacitor C two ends is slowly increased, ensure not produce impulse current in whole fan converter DC bus discharge process, realize smoothly discharging.Described inverter voltage Setting signal curve chart see Fig. 3 (transverse axis t represents the time, and longitudinal axis Vref represents the amplitude of inverter voltage Setting signal), but can not limit to.
See Fig. 4, the embodiment of the invention also discloses a kind of fan converter DC bus electric discharge device, to realize under the prerequisite not increasing hardware circuit, to the electric discharge of fan converter DC bus, comprising:
Off-grid judging unit 401, for after fan converter is shut down, judges whether fan converter departs from electrical network;
Start control unit 402, for after judgement obtains fan converter and electrical network departs from, restart fan converter; And the fan converter controlled after startup is operated in inverter voltage source module, the frequency of the frequency foundation current electric grid in inverter voltage source sets;
Shut down control unit 403, for obtaining the DC bus-bar voltage of fan converter; And after described DC bus-bar voltage drops to safe voltage, control fan converter and quit work.
Wherein, starting control unit 402 is the unit of frequency as the frequency in inverter voltage source equaling current electric grid using size.
Wherein, starting control unit 402 is under described inverter voltage source module, slowly increases the unit of the inverter voltage Setting signal of fan converter.
In sum; the present invention is after fan converter off-grid being detected; restart fan converter; it is made to be operated in inverter voltage source module; due to switching loss and inductance, capacity loss can be produced during fan converter inversion; consume the energy that DC bus is accumulated; DC bus-bar voltage is declined; therefore after detecting that DC bus-bar voltage drops to safe voltage; fan converter can be controlled shut down; thus achieve under the prerequisite additionally not increasing hardware circuit, to the object of fan converter DC bus electric discharge.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.For device disclosed in embodiment, because it corresponds to the method disclosed in Example, so description is fairly simple, relevant part illustrates see method part.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein when not departing from the spirit or scope of the embodiment of the present invention, can realize in other embodiments.Therefore, the embodiment of the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (6)
1. a fan converter DC bus charging method, is characterized in that, comprising:
After fan converter is shut down, judge whether fan converter departs from electrical network;
After judgement obtains fan converter and electrical network departs from, restart fan converter;
Control the fan converter after starting and be operated in inverter voltage source module, the frequency of the frequency foundation current electric grid in inverter voltage source sets;
Obtain the DC bus-bar voltage of fan converter;
After described DC bus-bar voltage drops to safe voltage, control fan converter and quit work.
2. method according to claim 1, is characterized in that, the frequency of the frequency foundation current electric grid in described inverter voltage source sets, and comprising: the frequency in setting inverter voltage source equals the frequency of current electric grid.
3. method according to claim 1 and 2, is characterized in that, under described inverter voltage source module, slowly increases the inverter voltage Setting signal of fan converter.
4. a fan converter DC bus electric discharge device, is characterized in that, comprising:
Off-grid judging unit, for after fan converter is shut down, judges whether fan converter departs from electrical network;
Start control unit, for after judgement obtains fan converter and electrical network departs from, restart fan converter; And the fan converter controlled after startup is operated in inverter voltage source module, the frequency of the frequency foundation current electric grid in inverter voltage source sets;
Shut down control unit, for obtaining the DC bus-bar voltage of fan converter; And after described DC bus-bar voltage drops to safe voltage, control fan converter and quit work.
5. device according to claim 4, is characterized in that, described startup control unit is the unit of frequency as the frequency in inverter voltage source equaling current electric grid using size.
6. the device according to claim 4 or 5, is characterized in that, described startup control unit is under described inverter voltage source module, slowly increases the unit of the inverter voltage Setting signal of fan converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510095215.0A CN104660023A (en) | 2015-03-03 | 2015-03-03 | Direct current bus discharge method and device for fan converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510095215.0A CN104660023A (en) | 2015-03-03 | 2015-03-03 | Direct current bus discharge method and device for fan converter |
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| Publication Number | Publication Date |
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| CN104660023A true CN104660023A (en) | 2015-05-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510095215.0A Pending CN104660023A (en) | 2015-03-03 | 2015-03-03 | Direct current bus discharge method and device for fan converter |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050263329A1 (en) * | 2004-05-25 | 2005-12-01 | Caterpillar Inc. | Electric drive system having DC bus voltage control |
| CN101051131A (en) * | 2006-04-04 | 2007-10-10 | 三星电机株式会社 | Liquid crystal display backlight inverter |
| CN101534083A (en) * | 2008-03-12 | 2009-09-16 | 通用汽车环球科技运作公司 | DC bus discharge in an electric motor system |
| CN101944759A (en) * | 2010-09-28 | 2011-01-12 | 深圳市禾望电气有限公司 | Capacitor discharge method of power electronic equipment bus |
| CN102916627A (en) * | 2012-10-19 | 2013-02-06 | 中科恒源科技股份有限公司 | Variable frequency starting method and device and storage battery supply |
| CN103023067A (en) * | 2012-12-11 | 2013-04-03 | 盐城工学院 | Direct-driven wind power generation system based on public direct current bus |
| CN103441661A (en) * | 2013-07-03 | 2013-12-11 | 中国船舶重工集团公司第七二四研究所 | Method for achieving soft starting of PWM convertor |
-
2015
- 2015-03-03 CN CN201510095215.0A patent/CN104660023A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050263329A1 (en) * | 2004-05-25 | 2005-12-01 | Caterpillar Inc. | Electric drive system having DC bus voltage control |
| CN101051131A (en) * | 2006-04-04 | 2007-10-10 | 三星电机株式会社 | Liquid crystal display backlight inverter |
| CN101534083A (en) * | 2008-03-12 | 2009-09-16 | 通用汽车环球科技运作公司 | DC bus discharge in an electric motor system |
| CN101944759A (en) * | 2010-09-28 | 2011-01-12 | 深圳市禾望电气有限公司 | Capacitor discharge method of power electronic equipment bus |
| CN102916627A (en) * | 2012-10-19 | 2013-02-06 | 中科恒源科技股份有限公司 | Variable frequency starting method and device and storage battery supply |
| CN103023067A (en) * | 2012-12-11 | 2013-04-03 | 盐城工学院 | Direct-driven wind power generation system based on public direct current bus |
| CN103441661A (en) * | 2013-07-03 | 2013-12-11 | 中国船舶重工集团公司第七二四研究所 | Method for achieving soft starting of PWM convertor |
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Application publication date: 20150527 |
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