CN202749836U - Low-voltage ride-through device of double-fed wind power generation system - Google Patents
Low-voltage ride-through device of double-fed wind power generation system Download PDFInfo
- Publication number
- CN202749836U CN202749836U CN2012203370331U CN201220337033U CN202749836U CN 202749836 U CN202749836 U CN 202749836U CN 2012203370331 U CN2012203370331 U CN 2012203370331U CN 201220337033 U CN201220337033 U CN 201220337033U CN 202749836 U CN202749836 U CN 202749836U
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- power generation
- wind power
- generation system
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- low
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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
Abstract
The utility model discloses a low-voltage ride-through device of a double-fed wind power generation system, wherein the low-voltage ride-through device comprises an uninterrupted power supply (UPS), an energy storage device, an alternating-current and direct-current converter, a bypass switch and a switch control device; the UPS is used for providing electrical energy for the double-fed wind power generation system; the input end of the energy storage device is connected between a power grid and a network side filter of the double-fed wind power generation system in series; the alternating-current and direct-current converter is connected with the output end of the energy storage device so as to conveniently provide electrical energy for the UPS; the bypass switch is connected with the output end of the energy storage device; and the switch control device is connected with the bypass switch so as to conveniently control on and off of the bypass switch. According to the utility model, when the voltage of the power grid drops, safety of a frequency converter in the double-fed wind power generation system and fault ride-through of a double-fed wind power generation unit are ensured; and the low-voltage ride-through function of the double-fed wind power generation system is realized.
Description
Technical field
The utility model relates to wind generator system, particularly a kind of low voltage crossing technology of dual feedback wind power generation system.
Background technology
Dual feedback wind power generation system today of Wind Power Generation Industry high speed development still in occupation of the leading position of wind power generation installed capacity, when the electric power system generation voltage of generator connection falls, the transient state surge current can occur in the stator of motor, the rotor, amplitude can reach 2 to 3 times of load current value.If can not this transient current of establishment, the frequency converter that is connected with rotor will be out of service because of overcurrent, even damaged, and this moment, motor can lose control to electromagnetic torque owing to uncontrollable exciting current.Then, the rotating speed of generator is fast rise at short notice, will cause brake system work when reaching the rev limit of wind-driven generator, thereby causes motor out of service.
Obviously, this state can't satisfy day by day harsh network planning to the requirement of electricity generation system.For addressing the above problem, the wind-powered electricity generation unit need to possess low voltage crossing (Low Voltage Ride Through, the LVRT) ability in the electric network fault situation, need to provide certain power support to electrical network in electric network fault situation leeward group of motors in addition.
At present, most of wind power generation double-fed units all adopt the crowbar circuit, and when system detected the DC bus-bar voltage overrate, the crowbar circuit will be triggered.The unnecessary energy that produces in the overvoltage process is fallen by the crowbar resistance consumption, can cause energy dissipation so undoubtedly, and unnecessary energy can produce a large amount of heat simultaneously, and this normal operation to unit also can bring adverse effect.Therefore, described crowbar circuit is the ultimate protection to the wind-powered electricity generation unit, and in a single day it be triggered, and will make a big impact to electrical network.
The utility model content
The purpose of this utility model is to provide a kind of low-voltage ride-through device of dual feedback wind power generation system, can solve better the low voltage crossing problem of dual feedback wind power generation system.
According to an aspect of the present utility model, a kind of low-voltage ride-through device of dual feedback wind power generation system is provided, comprising:
Be used for providing to dual feedback wind power generation system the uninterrupted power supply UPS of electric energy;
Input is serially connected in the energy accumulating device between electrical network and the dual feedback wind power generation system net side filter;
Connect the output of described energy accumulating device in order to the AC-DC converter of electric energy is provided to described UPS;
The by-pass switch that connects described energy accumulating device output; And
Connect described by-pass switch in order to control the switch controlling device of described by-pass switch break-make.
Preferably, described energy accumulating device is reactance transformer.
Preferably, described AC-DC converter is the diode three-phase commutation bridge.
Preferably, described by-pass switch is mos field effect transistor MOSFET.
Preferably, described switch controlling device comprises:
The master control system of falling for detection of line voltage;
Input connects the frequency converter controller of described master control system, is used for to connected described by-pass switch output for the control signal that is switched on or switched off.
Preferably, also comprise:
Be serially connected in the low-tension distribution board between described electrical network and the UPS.
Preferably, also comprise:
Be connected to the protective circuit that is used for voltage stabilizing of described energy accumulating device output.
Compared with prior art, the beneficial effects of the utility model are:
The utility model falls under the failure condition at serious line voltage, by the reasonable control to by-pass switch in the circuit and crowbar circuit, guaranteeing on the double-fed wind power generator group frequency-converter device inherently safe basis, can guarantee not off-grid operation of wind turbine generator, make double-fed wind power generator return to rapidly controlled running status, and provide certain meritorious and reactive power support to electrical network, realize the low voltage ride-through function of dual feedback wind power generation system.
Description of drawings
Fig. 1 is the low-voltage ride-through device block diagram of the dual feedback wind power generation system that provides of the utility model embodiment.
Description of reference numerals: 1-blade; The 2-gear box; The 3-double-fed generator; The 4-electrical network; 5-pusher side filter; 6-net side filter; 7-pusher side frequency converter; 8-net side frequency converter; The 9-reactance transformer; The 10-by-pass switch; The 11-protective circuit; The 12-AC-DC converter; The 13-crowbar circuit; The 14-frequency converter controller; The 15-pitch-controlled system; The 16-master control system; 17-UPS; The 18-low-tension distribution board.
Embodiment
Below in conjunction with accompanying drawing preferred embodiment of the present utility model is elaborated, should be appreciated that following illustrated preferred embodiment only is used for description and interpretation the utility model, and be not used in restriction the utility model.
Existing practical problem when the utility model only adopts the crowbar circuit for solving; realize the LVRT of double-fed wind power generator group system; on the basis of traditional crowbar circuit protection, the by-pass switch that has increased energy accumulating device reactance transformer, energy conversion device AC-DC converter, UPS, low-tension distribution board, protective circuit and controlled by the blower fan master control system.In conjunction with the crowbar circuit, by master control system by-pass switch is reasonably controlled, realize the LVRT function of DFIG system.When line voltage falls, described master control system disconnects by frequency converter controller control by-pass switch, described energy conversion device AC-DC converter exports the electric energy of described energy accumulating device reactance transformer storage to described UPS, making UPS is the dual feedback wind power generation system power supply, so that dual feedback wind power generation system normally moves.
Fig. 1 is the low-voltage ride-through device block diagram of the dual feedback wind power generation system that provides of the utility model embodiment; as shown in Figure 1; this device comprises the by-pass switch 10 for the uninterrupted power supply of energy storage and release (Uninterruptible Power Supply, UPS) 17, low-tension distribution board 18, reactance transformer 9, AC-DC converter 12, protective circuit 11, full-control type.Wherein, net side frequency converter 8 is not by directly being connected connection with electrical network behind the net side filter 6, but passes through to be connected with electrical network behind the reactance transformer 9 connection again.The secondary of this reactance transformer 9 is connected to by-pass switch 10 and protective circuit 11; link to each other with an AC-DC converter 12 more afterwards; the output of AC-DC converter is connected to UPS17, and UPS links to each other with low-tension distribution board 18 with master control system 16 again simultaneously, and low-tension distribution board 18 also will link to each other with electrical network 4.By-pass switch 10 is controlled by frequency converter controller 14 by master control system 16.
The selection of the electric parameter of reactance transformer 9 is by the power decision of wind-powered electricity generation unit.
By-pass switch 10 is selected controllable devices MOSFET, and its electric pressure is also by wind-powered electricity generation unit power decision, and general is the MOSFET of 1200V for the optional withstand voltage of 1.5MW unit, its use of should connecting with a current-limiting resistance.
AC-DC converter 12 adopts the diode three-phase commutation bridge.
Required UPS17 power also is by wind-powered electricity generation unit power decision.
When low-tension distribution board 18 works at unit, give the power supply of system core parts, also charge to UPS17 simultaneously.
The operation principle of described device is as follows:
In normal operation, by-pass switch 10 closures, the secondary of reactance transformer 9 is by short circuit, and this moment, the former limit of reactance transformer 9 was equivalent to a filter reactor, the UPS17 normal operation, low-tension distribution board 18 is to UPS17 and the power supply of other critical component.
When line voltage falls, electric current in the filter will be undergone mutation, blower fan master control system 16 detects this voltage and falls, control frequency converter controller 14 correspondingly reduces the Voltage-output of net side frequency converter 8, and send control signal to the by-pass switch 10 of reactance transformer 9 secondary, cut-off switch, the energy that store in the reactance transformer 9 this moment shifts to AC-DC converter 12, AC-DC converter 12 is started working simultaneously, to UPS17 power supply electric energy supplement, keep the function of the subsystem critical components such as pitch-controlled system, avoid causing to satisfy owing to self power supply capacity is limited the requirement of LVRT.
When detecting line voltage and fall, the master control system 16 of blower fan is converted to mode by the UPS17 power supply with low-tension distribution board 18 to the mode of unit key component power supply, stops simultaneously the part non-critical component, guarantees the normal operation of key component.In order in low power event, to protect wind turbine generator; power converter is powered by UPS17, and comprises a protective circuit 11, is used for voltage is maintained in the allowed band; frequency converter controller 14 starts or stops protective circuit 11 selectively, so that electric current is kept within the acceptable range.Because reactance transformer 9 secondary are powered to UPS17, and its equiva lent impedance improves greatly, electric current also is effectively suppressed simultaneously.
After electric network fault was removed, it is normal that line voltage recovers, and double-fed generator 3 recovers normal operating condition again through after the of short duration adjustment process, has realized the low voltage crossing of dual feedback wind power generation system.
In sum, the utility model under failure condition, can make double-fed generator return to rapidly controlled running status by the reasonable control of master control system to by-pass switch, and provide certain meritorious reactive power support to electrical network, thereby realized the low voltage crossing of dual feedback wind power generation system.
Although above the utility model is had been described in detail, the utility model is not limited to this, and those skilled in the art of the present technique can carry out various modifications according to principle of the present utility model.Therefore, all modifications of doing according to the utility model principle all should be understood to fall into protection range of the present utility model.
Claims (7)
1. the low-voltage ride-through device of a dual feedback wind power generation system is characterized in that, comprising:
Be used for providing to dual feedback wind power generation system the uninterrupted power supply UPS of electric energy;
Input is serially connected in the energy accumulating device between electrical network and the dual feedback wind power generation system net side filter;
Connect the output of described energy accumulating device in order to the AC-DC converter of electric energy is provided to described UPS;
The by-pass switch that connects described energy accumulating device output; And
Connect described by-pass switch in order to control the switch controlling device of described by-pass switch break-make.
2. device according to claim 1 is characterized in that, described energy accumulating device is reactance transformer.
3. device according to claim 1 is characterized in that, described AC-DC converter is the diode three-phase commutation bridge.
4. device according to claim 1 is characterized in that, described by-pass switch is mos field effect transistor MOSFET.
5. device according to claim 4 is characterized in that, described switch controlling device comprises:
The master control system of falling for detection of line voltage;
Input connects the frequency converter controller of described master control system, is used for to connected described by-pass switch output for the control signal that is switched on or switched off.
6. the described device of any one is characterized in that according to claim 1-5, also comprises the low-tension distribution board that is serially connected between described electrical network and the UPS.
7. device according to claim 6 is characterized in that, also comprises the protective circuit that is used for voltage stabilizing that is connected to described energy accumulating device output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012203370331U CN202749836U (en) | 2012-07-11 | 2012-07-11 | Low-voltage ride-through device of double-fed wind power generation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012203370331U CN202749836U (en) | 2012-07-11 | 2012-07-11 | Low-voltage ride-through device of double-fed wind power generation system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202749836U true CN202749836U (en) | 2013-02-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012203370331U Expired - Lifetime CN202749836U (en) | 2012-07-11 | 2012-07-11 | Low-voltage ride-through device of double-fed wind power generation system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202749836U (en) |
-
2012
- 2012-07-11 CN CN2012203370331U patent/CN202749836U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: SINOVEL WIND TECHNOLOGY (GANSU) CO., LTD. Free format text: FORMER OWNER: SINOVEL WIND (GROUP) CO., LTD. Effective date: 20150119 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 100872 HAIDIAN, BEIJING TO: 735000 JIUQUAN, GANSU PROVINCE |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20150119 Address after: Suzhou Industrial Park 735000 area in Gansu city of Jiuquan province (South Park) Patentee after: Sinovel Technology (Gansu) Co.,Ltd. Address before: 100872 cultural building, 59 Zhongguancun street, Beijing, Haidian District Patentee before: SINOVEL WIND GROUP Co.,Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130220 |