CN103278692A - Method for detecting brake circuit of wind power generation converter - Google Patents
Method for detecting brake circuit of wind power generation converter Download PDFInfo
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- CN103278692A CN103278692A CN2013101624332A CN201310162433A CN103278692A CN 103278692 A CN103278692 A CN 103278692A CN 2013101624332 A CN2013101624332 A CN 2013101624332A CN 201310162433 A CN201310162433 A CN 201310162433A CN 103278692 A CN103278692 A CN 103278692A
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Abstract
The invention discloses a method for detecting a brake circuit of a wind power generation converter. The method comprises the following steps of pre-charging a DC (Direct Current) bus, and putting the DC bus into work when the brake circuit is short; during a working period, synchronously collecting voltages of the DC bus and currents of a brake device for multiple times by a data collector; obtaining a calculating value and a design value of a brake resistor by utilizing the collected voltages of the DC bus and the collected currents of the brake device and calculating resistance value deviation; outputting a normal signal of the brake circuit if the resistance value deviation is within a confidence interval of the brake resistor; and outputting an abnormal signal of the brake circuit if the resistance value deviation is out of the confidence interval of the brake resistor. According to the method disclosed by the invention, the brake circuit can be automatically tested by utilizing a control system before grid-connection power generation of the wind power generation converter, thus not only can whether the whole brake circuit is in correct connection or not be detected, but also whether the performance of the brake resistor is lowered or not can be detected, whether in-advance alarm needs to be carried out or not can be judged according to detecting results, and safety accidents caused by failure of the brake circuit can be prevented.
Description
Technical field
The present invention relates to a kind of wind-force generating converter, relate in particular to a kind of wind-force generating converter brake circuit detection method.
Background technology
At present, in the wind-force generating converter design of MW class, adopt mostly and hand over orthogonal (AC-DC-AC, Alternating Current-Direct Current-Alternating Current) topological structure, the three-phase alternating current that wind power generating set produces is rectified into direct current by pusher side unsteady flow module, energy is stored on the dc bus, carry out inversion by net side unsteady flow module then, the three-phase electricity that becomes electrical network to receive the energy conversion on the dc bus, so just form one by the energy conversion ring of motor to electrical network, realized the transfer of energy.
What need concern is; if net side unsteady flow module does not have in time to send the energy on the dc bus to electrical network; and pusher side unsteady flow module constantly is injected into the energy that generator produces on the dc bus; can cause DC bus-bar voltage constantly to raise; serious threat to the safety of power device, thereby is just seemed particularly important to the protection of dc bus overvoltage in whole converter system.
Current, in order to consume electric weight too much on the dc bus fast, mostly adopting between positive and negative dc bus increases a brake circuit and solves this problem.Generally, brake circuit is in holding state, and its health status is unknown, when brake circuit wiring error or the decline of braking resistor performance, can cause brake circuit to lose efficacy, will badly influence the security of operation of whole current transformer, can cause the device accident of blasting when serious.
Summary of the invention
The technical problem to be solved in the present invention is to find a kind of can the test brake circuit, and guarantees the wind-force generating converter brake circuit detection method of equipment safety operation.
Provide a kind of wind-force generating converter brake circuit detection method, current transformer to comprise that pusher side unsteady flow module is connected with net side unsteady flow module and by dc bus in order to solve the problems of the technologies described above,
Step 1 is carried out precharge to dc bus, and brake circuit is devoted oneself to work in short-term;
Step 4 is if the resistance deviation in the fiducial interval of braking resistor, is then exported the brake circuit normal signal;
If the resistance deviation outside the fiducial interval of braking resistor, is then exported the brake circuit abnormal signal;
Further, in step 1, when dc bus is carried out precharge, the voltage the when voltage of maintenance dc bus is lower than the dc bus operate as normal.
Further, resistance deviation=(braking resistor calculated value-braking resistor design load)/braking resistor design load.
Further, the fiducial interval in the described step 4 is that the resistance deviation is between-5% to+5%.
Further, described clamping device is arranged between pusher side unsteady flow module and the net side unsteady flow module and is connected across between the dc bus both positive and negative polarity.
Further, described clamping device includes insulated gate bipolar transistor IGBT bridge and the braking resistor of series connection successively.
Further, described data acquisition unit is directly gathered the voltage of dc bus, and by IGBT current acquisition circuit the IGBT bridge is carried out current acquisition.
Further, described IGBT current acquisition circuit is arranged on brake module inside.
Further, described IGBT current acquisition circuit is arranged on the brake module outside.
Further, described data acquisition unit is the AD collector.
The present invention can be before current transformer generates electricity by way of merging two or more grid systems, utilize control system automatically brake circuit to be tested, both can detect the wiring correctness of whole brake circuit, whether can also detect the braking resistor performance descends, judge whether to report to the police in advance according to testing result, avoid because the security incident that brake circuit lost efficacy and causes.
Description of drawings
Fig. 1 is wind-force generating converter structure of the present invention;
Fig. 2 is the brake circuit test flow chart.
Among the figure, 1. pusher side unsteady flow module, 2. net side unsteady flow module, 3. dc bus, 4. clamping device, 5. braking resistor, 6. IGBT bridge, 7. data acquisition unit.
Embodiment
The invention will be further described below in conjunction with the drawings and specific embodiments, can be implemented so that those skilled in the art can better understand the present invention also, but illustrated embodiment is not as a limitation of the invention.
As depicted in figs. 1 and 2, be a kind of wind-force generating converter structure and brake circuit test flow chart, current transformer comprises that pusher side unsteady flow module 1 is connected with net side unsteady flow module 2 and by dc bus 3, described clamping device 4 is arranged between pusher side unsteady flow module 1 and the net side unsteady flow module 2 and is connected across between dc bus 3 both positive and negative polarities, consume unnecessary electric weight on the dc bus 3 by clamping device 4, described clamping device 4 includes the IGBT(Insulated Gate Bipolar Transistor of series connection successively, insulated gate bipolar transistor) bridge 6 and braking resistor 5.
Wind-force generating converter also includes data acquisition unit 7, described data acquisition unit 7 is connected with dc bus 3 with IGBT bridge 6 respectively, described data acquisition unit 7 can obtain voltage, IGBT bridge 6 electric currents on the dc bus 3 synchronously, in the present embodiment, data acquisition unit 7 is to gather electric current and information is passed to data acquisition unit 7 by IGBT current acquisition circuit, described IGBT current acquisition circuit is not limited in and is arranged on braking IGBT bridge 6 inside, braking IGBT bridge 6 outsides also can be set, as long as can measure electric current.
Described data acquisition unit 7 is the AD collector, and described AD collector can be converted into digital signal with such as electric current, these simulating signals of voltage, draws the calculating resistance R of braking resistor 5 then by electric current, the voltage of gathering.
What pay particular attention to is that the operate as normal of braking resistor 5 is limited by maximum operating currenbt and working temperature, normally how long represents with continuous firing under the maximum operating currenbt situation; When brake circuit is tested, should guarantee that the working time of the measuring current of braking and brake circuit surpasses the limit range that braking resistor 5 can bear.
When brake circuit is tested, at first dc bus 3 is carried out precharge, devote oneself to work in short-term in the forced brake loop, for fear of the impact that brings because of direct closed master switch circuit is caused damage, when dc bus was carried out precharge, the voltage of the voltage that keep dc bus during a little less than the dc bus operate as normal was after precharge is finished, by the control of software program, make braking IGBT bridge 6 in one minimum period, work.
At the brake circuit test period, gather the voltage U of dc bus 3 and the electric current I of clamping device 4 synchronously more than 7 time by data acquisition unit; Utilize dc bus 3 voltages and clamping device 4 electric currents that collect to calculate then, draw the calculated value R=U/I of braking resistor 5, and the calculated value R of braking resistor 5 and the design load R ' of braking resistor 5 are compared; If the resistance deviation in the fiducial interval of braking resistor 5, is then exported the brake circuit normal signal, can allow equipment continue operation; If the resistance deviation outside the fiducial interval of braking resistor 5, is then exported the brake circuit abnormal signal, this moment, equipment can be made the reflection of disorderly closedown, after debugging, tested till meeting standard again again.
Among the present invention, the R ' value of calculating gained R value and design compares, if calculated value R differs greatly (R ' size of value relevant with the performance that braking resistor 5 designs) with design load R ', then thinks brake module 4 cisco unity malfunction.Be that fiducial interval is that example describes with braking resistor 5 resistance deviations ± 5% now, particular problem can be pressed surface analysis and handle:
-5%≤(R calculated value-R ' design load)/R ' design load≤5%: brake circuit is normal;
(R calculated value-R ' design load)/R ' design load〉5% or＜-5%: braking resistor is unusual;
After test brake circuit test result is unusual, data acquisition unit 7 passes to alarm device with information, current transformer is quoted fault, quit work, system enters into fail safe situation, and then the investigation problem, after the problem for the treatment of solves, current transformer can restart test job, till each index is qualified.
The present invention has increased after the brake circuit test function, before current transformer generates electricity by way of merging two or more grid systems, can just can detect brake circuit operate as normal, avoid converter system in operational process, make the brake circuit cisco unity malfunction because dc bus 3 overvoltages occurring, cause current transformer fault, power model demolition even blower fan off-grid accident, the security that has improved converter system greatly take place.
The above embodiment is the preferred embodiment that proves absolutely that the present invention lifts, and protection scope of the present invention is not limited thereto.Being equal to that those skilled in the art do on basis of the present invention substitutes or conversion, all within protection scope of the present invention.Protection scope of the present invention is as the criterion with claims.
Claims (10)
1. wind-force generating converter brake circuit detection method, current transformer comprises that pusher side unsteady flow module is connected with net side unsteady flow module and by dc bus, it is characterized in that,
Step 1 is carried out precharge to dc bus, and brake circuit is devoted oneself to work in short-term;
Step 2 at the brake circuit duration of work, is repeatedly gathered the voltage of dc bus and the electric current of clamping device synchronously by data acquisition unit;
Step 3 utilizes the voltage of the dc bus that collects and the electric current of clamping device to calculate, and draws the calculated value of braking resistor, and the calculated value of braking resistor and the design load of braking resistor are carried out the calculating of resistance deviation;
Step 4 is if the resistance deviation in the fiducial interval of braking resistor, is then exported the brake circuit normal signal;
If the resistance deviation outside the fiducial interval of braking resistor, is then exported the brake circuit abnormal signal;
Step 5 according to the brake circuit abnormal signal, is debugged brake circuit, after the debugging, repeats step 1.
2. wind-force generating converter brake circuit detection method according to claim 1 is characterized in that, in step 1, and when dc bus is carried out precharge, the voltage the when voltage of maintenance dc bus is lower than the dc bus operate as normal.
3. wind-force generating converter brake circuit detection method according to claim 1 is characterized in that, resistance deviation=(braking resistor calculated value-braking resistor design load)/braking resistor design load.
4. wind-force generating converter brake circuit detection method according to claim 3 is characterized in that, the fiducial interval in the described step 4 is that the resistance deviation is between-5% to+5%.
5. wind-force generating converter brake circuit detection method according to claim 1 is characterized in that, described clamping device is arranged between pusher side unsteady flow module and the net side unsteady flow module and is connected across between the dc bus both positive and negative polarity.
6. wind-force generating converter brake circuit detection method according to claim 5 is characterized in that, described clamping device includes insulated gate bipolar transistor IGBT bridge and the braking resistor of series connection successively.
7. wind-force generating converter brake circuit detection method according to claim 6 is characterized in that described data acquisition unit is directly gathered the voltage of dc bus, and by IGBT current acquisition circuit the IGBT bridge is carried out current acquisition.
8. wind-force generating converter brake circuit detection method according to claim 7 is characterized in that, described IGBT current acquisition circuit is arranged on brake module inside.
9. wind-force generating converter brake circuit detection method according to claim 7 is characterized in that, described IGBT current acquisition circuit is arranged on the brake module outside.
10. wind-force generating converter brake circuit detection method according to claim 1 is characterized in that, described data acquisition unit is the AD collector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310162433.2A CN103278692B (en) | 2013-05-06 | 2013-05-06 | Brake circuit of wind power generation converter detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310162433.2A CN103278692B (en) | 2013-05-06 | 2013-05-06 | Brake circuit of wind power generation converter detection method |
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| CN103278692A true CN103278692A (en) | 2013-09-04 |
| CN103278692B CN103278692B (en) | 2015-08-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310162433.2A Active CN103278692B (en) | 2013-05-06 | 2013-05-06 | Brake circuit of wind power generation converter detection method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105067927A (en) * | 2015-08-11 | 2015-11-18 | 清能德创电气技术（北京）有限公司 | Servo driver brake resistor loop detection method |
| CN106169861A (en) * | 2015-05-18 | 2016-11-30 | 海德堡印刷机械股份公司 | Protection circuit for braking resistor |
| CN110749840A (en) * | 2019-11-27 | 2020-02-04 | 珠海格力电器股份有限公司 | Detection method and device for improving safety of converter and converter |
| CN112557779A (en) * | 2019-09-26 | 2021-03-26 | 株洲中车时代电气股份有限公司 | Converter abnormity monitoring method and device |
| CN112928742A (en) * | 2019-12-05 | 2021-06-08 | 新疆金风科技股份有限公司 | Direct-current bus overvoltage protection method of converter and corresponding controller |
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| US6960928B2 (en) * | 2003-11-21 | 2005-11-01 | International Business Machines Corporation | Electromagnetic coupling based motor plug detect system and method |
| CN202093095U (en) * | 2011-06-09 | 2011-12-28 | 上海市电力公司 | Direct-current resistance tester for transformer |
| CN202474880U (en) * | 2012-03-15 | 2012-10-03 | 广东明阳龙源电力电子有限公司 | Wind power generating device |
| CN103078565A (en) * | 2012-12-25 | 2013-05-01 | 北京金风科创风电设备有限公司 | generator braking device |
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| SU1061065A2 (en) * | 1982-04-26 | 1983-12-15 | Предприятие П/Я В-2015 | Device for measuring switch contact insulation resistance |
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2013
- 2013-05-06 CN CN201310162433.2A patent/CN103278692B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6960928B2 (en) * | 2003-11-21 | 2005-11-01 | International Business Machines Corporation | Electromagnetic coupling based motor plug detect system and method |
| CN202093095U (en) * | 2011-06-09 | 2011-12-28 | 上海市电力公司 | Direct-current resistance tester for transformer |
| CN202474880U (en) * | 2012-03-15 | 2012-10-03 | 广东明阳龙源电力电子有限公司 | Wind power generating device |
| CN103078565A (en) * | 2012-12-25 | 2013-05-01 | 北京金风科创风电设备有限公司 | generator braking device |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106169861A (en) * | 2015-05-18 | 2016-11-30 | 海德堡印刷机械股份公司 | Protection circuit for braking resistor |
| CN105067927A (en) * | 2015-08-11 | 2015-11-18 | 清能德创电气技术（北京）有限公司 | Servo driver brake resistor loop detection method |
| CN105067927B (en) * | 2015-08-11 | 2018-01-09 | 清能德创电气技术（北京）有限公司 | A kind of servo-driver braking resistor return circuit detection method |
| CN112557779A (en) * | 2019-09-26 | 2021-03-26 | 株洲中车时代电气股份有限公司 | Converter abnormity monitoring method and device |
| CN110749840A (en) * | 2019-11-27 | 2020-02-04 | 珠海格力电器股份有限公司 | Detection method and device for improving safety of converter and converter |
| CN112928742A (en) * | 2019-12-05 | 2021-06-08 | 新疆金风科技股份有限公司 | Direct-current bus overvoltage protection method of converter and corresponding controller |
| CN112928742B (en) * | 2019-12-05 | 2023-09-12 | 金风科技股份有限公司 | Overvoltage protection method for direct-current bus of converter and corresponding controller |
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| CN103278692B (en) | 2015-08-19 |
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