CN103944192A - Control method for fault ride-through of direct-current exciting direct-driven wind turbine generator - Google Patents
Control method for fault ride-through of direct-current exciting direct-driven wind turbine generator Download PDFInfo
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- CN103944192A CN103944192A CN201410203815.XA CN201410203815A CN103944192A CN 103944192 A CN103944192 A CN 103944192A CN 201410203815 A CN201410203815 A CN 201410203815A CN 103944192 A CN103944192 A CN 103944192A
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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Abstract
The invention relates to a control method for fault ride-through of a direct-current exciting direct-driven wind turbine generator. The control method comprises a first step of determining a power grid voltage, a second step of detecting the state of an energy storage device, a third step of enabling the energy storage device to store energy after the system enters a fault ride-through mode, a fourth step of determining a direct-current link voltage, a fifth step of returning the first step after an excitation device outputs the rated exciting current, a sixth step of returning to the first step if the flux-weakening mode of the excitation device is enabled and the set scale value of the rated exciting current output by the excitation device is E4, and a seventh step of directly stopping the wind turbine generator. The control method is capable of realizing primary protection on fault ride-through by use of the energy storage device without employing a crowbar circuit, and further capable of performing secondary protection by use of the flux-weakening technology, thereby reducing the requirements on the capacity and the charge/discharge speed of the energy storage device.
Description
Technical field
The present invention relates to wind-driven generator field, relate in particular to the control method of the directly driven wind-powered unit fault traversing of a kind of DC excitation.
Background technology
Along with maintaining sustained and rapid growth of wind power generation in world wide, wind-powered electricity generation shared ratio in electrical network is increasing.Due to wind energy, have the properties such as intermittence, randomness, wind-powered electricity generation also can produce series of problems in network process.Wherein, it is exactly one of bottleneck of wind-electricity integration that low voltage failure passes through, and the consequence causing is also the most serious.If wind-powered electricity generation unit does not possess fault ride-through capacity, when electrical network breaks down, can cause wind-powered electricity generation unit large area to be shut down, the local meritorious disappearance of electrical network, constitutes a threat to the stability of electrical network and the quality of power supply, brings about great losses.
At present, the control method of the directly driven wind-powered unit fault traversing of the DC excitation of more use is generally increase crowbar circuit, with heat energy form unloading excess energy.This method be take and removed unnecessary electric weight as controlling object, to realize fault traversing, has caused part electric quantity loss.And when power system restoration is normal, DC tache voltage there will be of short duration fluctuation, when serious, can cause wind-powered electricity generation compressor emergency shutdown.
And the method for current permanent-magnetic wind driven generator group fault traversing utilizes energy storage device to carry out energy back; the method relies on merely energy storage device to store the excess energy producing during fault traversing; but can there is following defect: because the fault traversing time interval is very short; require the speed that discharges and recharges of energy storage device to be exceedingly fast; in addition in order to improve protective capability, the capacity requirement of energy storage device is large as far as possible.
Summary of the invention
The object of the invention is to overcome above defect, provide a kind of minimizing electric quantity loss and when power system restoration is normal, reduce the control method of the directly driven wind-powered unit fault traversing of DC excitation of the fluctuation of DC tache voltage.
For realizing above object, technical scheme of the present invention is, the control method of the directly driven wind-powered unit fault traversing of a kind of DC excitation, and it comprises the following steps:
Step 1: line voltage judgement, the ratio of judgement real-time grid voltage and specified line voltage, when the ratio of real-time grid voltage and specified line voltage is more than or equal to preset proportion value E1, enter step 2, when the ratio of real-time grid voltage and specified line voltage is less than preset proportion value E1, enter step 3;
Step 2: detect energy storage device state, if energy storage device, in closed condition, returns to step 1, if energy storage device in energy storage discharge condition, electric discharge is closed energy storage device after finishing, and returns to step 1;
Step 3: system enters fault traversing pattern, starts energy storage device and carries out energy storage, enters step 4 simultaneously;
Step 4: judge DC tache voltage, if the preset proportion value E2 that real-time DC tache voltage value is less than specified DC tache voltage enters step 5, if the preset proportion value E2 that in real time DC tache voltage value is less than or equal to the preset proportion value E3 of specified DC tache voltage and is more than or equal to specified DC tache voltage enters step 6, if the preset proportion value E3 that DC tache voltage value is greater than specified DC tache voltage in real time enters step 7;
Step 5: excitation unit output rated exciting current, returns to step 1;
Step 6: excitation unit starts weak magnetic pattern, the preset proportion value E4 of excitation unit output rated exciting current, is back to step 1;
Step 7: wind-powered electricity generation unit is directly shut down.
Preferably, the preset proportion value E1 of described step 1 is 90%.
Preferably, the preset proportion value E2 of described step 4 is 110%, and preset proportion value E3 is 120%.
Preferably, the preset proportion value E4 of described step 6 is 80%.
Useful technique effect of the present invention is: utilize energy storage device once to protect fault traversing, thus without utilizing crowbar circuit, and utilize weak magnetic technology to carry out second protection, thus reduce capacity of energy storing device and the requirement that discharges and recharges speed.
Accompanying drawing explanation
Fig. 1 is embodiment of the present invention circuit block diagram;
Fig. 2 is embodiment of the present invention system block diagram;
Fig. 3 is embodiment of the present invention flow diagram.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
With reference to Fig. 1, Fig. 2, the directly driven wind-powered unit of DC excitation of the present invention comprises direct-current excited-field generator 1, pusher side current transformer 2, DC link 3, net side converter 4, excitation unit 5, detection module 6, total control module 7, energy back device 8.Direct-current excited-field generator 1, electrical network 9 are respectively by pusher side current transformer 2, the rear connection DC link 3 of net side converter 4, DC link 3 is carried out excitation by 5 pairs of direct-current excited-field generators of excitation unit 1, detection module 6 detects the voltage of DC link 3 and electrical network 9, energy back device 8 carries out charging and discharging by DC link 3, and total control module 7 is according to the operating state of the signal controlling excitation unit 5 of detection module 6 and energy back device 8.Total control module 7 comprises analytical calculation module 10, energy back control module 11 and excitation control module 12, the real-time voltage signal that 10 pairs of detection modules 6 of analytical calculation module transport is analyzed, then carry fill order to energy back control module 11 and excitation control module 12, after energy back control module 11 and excitation control module 12 receive fill order, control respectively energy back device 8 and excitation unit 5, to realize the system failure, pass through function.
With reference to Fig. 3, the control method of the directly driven wind-powered unit fault traversing of a kind of DC excitation, it comprises the following steps:
Step 1: line voltage judgement, the ratio of judgement real-time grid voltage and specified line voltage, when the ratio of real-time grid voltage and specified line voltage is more than or equal to 90%, enters step 2, when the ratio of real-time grid voltage and specified line voltage is less than 90%, enter step 3;
Step 2: detect energy storage device state, if energy storage device, in closed condition, returns to step 1, if energy storage device in energy storage discharge condition, switch discharges pattern, closes energy storage device after electric discharge finishes, and returns to step 1;
Step 3: system enters fault traversing pattern, starts energy storage device and carries out energy storage, enters step 4 simultaneously;
Step 4: judge DC tache voltage, if in real time DC tache voltage value is less than 110% of specified DC tache voltage and enters step 5, if real-time DC tache voltage value is less than or equal to specified DC tache voltage 120% and is more than or equal to 110% of specified DC tache voltage, enter step 6, if real-time DC tache voltage value is greater than 120% of specified DC tache voltage, enter step 7;
Step 5: excitation unit output rated exciting current, returns to step 1;
Step 6: excitation unit starts weak magnetic pattern, 80% of excitation unit output rated exciting current, is back to step 1;
Step 7: wind-powered electricity generation unit is directly shut down.
Claims (5)
1. a control method for the directly driven wind-powered unit fault traversing of DC excitation, is characterized in that, it comprises the following steps:
Step 1, line voltage judgement, the ratio of judgement real-time grid voltage and specified line voltage, when the ratio of real-time grid voltage and specified line voltage is more than or equal to preset proportion value E1, enter step 2, when the ratio of real-time grid voltage and specified line voltage is less than preset proportion value E1, enter step 3;
Step 2, detect energy storage device state, if energy storage device, in closed condition, returns to step 1, if energy storage device in energy storage discharge condition, electric discharge is closed energy storage device after finishing, and returns to step 1;
Step 3, system enter fault traversing pattern, start energy storage device and carry out energy storage, enter step 4 simultaneously;
Step 4, judgement DC tache voltage, if the preset proportion value E2 that real-time DC tache voltage value is less than specified DC tache voltage enters step 5, if the preset proportion value E2 that in real time DC tache voltage value is less than or equal to the preset proportion value E3 of specified DC tache voltage and is more than or equal to specified DC tache voltage enters step 6, if the preset proportion value E3 that DC tache voltage value is greater than specified DC tache voltage in real time enters step 7;
Step 5, excitation unit output rated exciting current, return to step 1;
Step 6, excitation unit start weak magnetic pattern, and the preset proportion value E4 of excitation unit output rated exciting current, is back to step 1;
Step 7, wind-powered electricity generation unit are directly shut down.
2. the control method of the directly driven wind-powered unit fault traversing of a kind of DC excitation according to claim 1, is characterized in that, the preset proportion value E1 of described step 1 is 90%.
3. according to the control method of claim 1 or the directly driven wind-powered unit fault traversing of a kind of DC excitation claimed in claim 2, it is characterized in that, the preset proportion value E2 of described step 4 is 110%, and preset proportion value E3 is 120%.
4. according to the control method of claim 1 or the directly driven wind-powered unit fault traversing of a kind of DC excitation claimed in claim 2, it is characterized in that, the preset proportion value E4 of described step 6 is 80%.
5. the control method of the directly driven wind-powered unit fault traversing of a kind of DC excitation according to claim 3, is characterized in that, the preset proportion value E4 of described step 6 is 80%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410203815.XA CN103944192A (en) | 2014-05-15 | 2014-05-15 | Control method for fault ride-through of direct-current exciting direct-driven wind turbine generator |
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| CN201410203815.XA CN103944192A (en) | 2014-05-15 | 2014-05-15 | Control method for fault ride-through of direct-current exciting direct-driven wind turbine generator |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3903967B2 (en) * | 2003-07-31 | 2007-04-11 | 株式会社日立製作所 | Wind power generation system |
| CN101710789A (en) * | 2009-12-03 | 2010-05-19 | 华章电气（桐乡）有限公司 | Megawatt-level permanent magnet direct-drive wind-force generating converter and control method |
| CN103337878A (en) * | 2013-07-22 | 2013-10-02 | 湘电风能有限公司 | Control method for low-voltage ride through of direct-drive electric excitation type wind turbine generator |
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- 2014-05-15 CN CN201410203815.XA patent/CN103944192A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3903967B2 (en) * | 2003-07-31 | 2007-04-11 | 株式会社日立製作所 | Wind power generation system |
| CN101710789A (en) * | 2009-12-03 | 2010-05-19 | 华章电气（桐乡）有限公司 | Megawatt-level permanent magnet direct-drive wind-force generating converter and control method |
| CN103337878A (en) * | 2013-07-22 | 2013-10-02 | 湘电风能有限公司 | Control method for low-voltage ride through of direct-drive electric excitation type wind turbine generator |
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Application publication date: 20140723 |
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