CN201904625U - Low-voltage crossing controller of wind generating set based on converter - Google Patents
Low-voltage crossing controller of wind generating set based on converter Download PDFInfo
- Publication number
- CN201904625U CN201904625U CN2010206108765U CN201020610876U CN201904625U CN 201904625 U CN201904625 U CN 201904625U CN 2010206108765 U CN2010206108765 U CN 2010206108765U CN 201020610876 U CN201020610876 U CN 201020610876U CN 201904625 U CN201904625 U CN 201904625U
- Authority
- CN
- China
- Prior art keywords
- converter
- voltage
- direct current
- controller
- generating set
- Prior art date
- 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.)
- Expired - Lifetime
Links
Images
Classifications
-
- 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
-
- 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
- Y02E40/30—Reactive power compensation
Landscapes
- Control Of Eletrric Generators (AREA)
Abstract
The utility model discloses a low-voltage crossing controller of a wind generating set based on a converter, which comprises a converter, a converter controller, and a main low-voltage crossing controller; the converter and an auxiliary breaker are connected in series into a controlled branch; a main breaker between the wind generating set and a power grid is connected with the controlled branch in parallel; the converter comprises a rectifier, an inverter, and a capacitor; a direct current anode bus and a direct current cathode bus are arranged between the rectifier and the inverter; the capacitor and an unloading resistor are connected between the two buses; the unloading resistor is connected with the capacitor in parallel; the unloading resistor is connected with a controlled valve in series; the controlled valve is connected with the converter controller; a power grid end is connected with an alternating current voltage detector; a direct current voltage detector is connected between the direct current anode bus and the direct current cathode bus; both the alternating current voltage detector and the direct current voltage detector are connected with the main low-voltage crossing controller; and the main low-voltage crossing controller is connected with the converter controller, the main breaker, and the auxiliary breaker. The low-voltage crossing controller of the wind generating set based on the converter can effectively adapt to deep voltage fall occasions and has excellent stability.
Description
Technical Field
The utility model relates to a wind generating set's low-voltage ride through controlling means.
Background
With the continuous increase of the installation capacity of the wind turbine generator, the operation of the wind turbine generator under the condition of power grid fault becomes more important, and meanwhile, the power grid guide requires the wind turbine generator to operate without being disconnected from the power grid when the voltage of the power grid drops instantly within a certain range. Because voltage drop can bring a series of transient processes to the motor, such as overvoltage, overcurrent or rotating speed rise, and the like, and the safe operation of the fan and a control system thereof is seriously damaged, the fan is passively self-protected and immediately disconnected when a power grid fails in general, the duration and the severity of the failure are not considered, and the safety of the fan can be furthest guaranteed. The wind power generation system can accept the situation that the penetration power of a power grid of wind power generation is low, however, when the wind power occupies a large proportion in the power grid, if the wind turbine still adopts passive protection type splitting when the voltage drops, the recovery difficulty of the whole system can be increased, even faults can be aggravated, and finally other units of the system are completely split; meanwhile, the frequency stability problem is caused by the large change of the system tide and even the large-area power failure.
The LVRT is passed by the low voltage required by the grid guide, which means that when the voltage of the grid connection point of the fan drops, the fan can keep being connected to the grid, even a certain reactive power is provided for the grid to support the recovery of the grid until the grid recovers to be normal, so that the low voltage time region is passed through. The deeper the grid drop amplitude, the shorter the on-grid time is required.
Scholars at home and abroad deeply research the low voltage ride through characteristic of the doubly-fed fan and put forward a good solution, but no good solution is provided for the low voltage ride through of the fixed pitch stall type fan. For the fixed-pitch wind turbine generator which is operated on site in a large quantity at present, the problem of low-voltage ride-through transformation of the wind turbine generator needs to be solved no matter for owners of wind farms or manufacturers of wind turbines.
The improvement scheme of the fan outlet end parallel reactive power compensator has the advantages that the compensation effect of the reactive power compensator is in direct proportion to the voltage square of the fan outlet end connected with the reactive power compensator, so that the compensation effect of the reactive power compensator is greatly limited when the power grid fault voltage drops. When the voltage drops, the active power generated by the unit cannot be sent to a power grid, and meanwhile, the active power generated by the unit cannot be quickly consumed, and the accumulated functional quantity finally enables the rotating speed of the unit to quickly and greatly rise; when the voltage is recovered, the torque of the generator vibrates greatly, and the gear box of the generator is seriously damaged. By using the transformation scheme, only the condition of voltage drop with lower degree can be completed, and the deep voltage drop cannot be completed.
Disclosure of Invention
In order to overcome the not enough of unable adaptation depth voltage of existing wind generating set's low-voltage ride through control mode and drop occasion, poor stability, the utility model provides a wind generating set low-voltage ride through controlling means based on converter that effectively adapts to depth voltage and drops occasion, stability is good.
The utility model provides a technical scheme that its technical problem adopted is:
a wind generating set low voltage ride through control device based on a converter comprises the converter, a converter controller and a low voltage ride through main controller, wherein the converter and an auxiliary breaker are connected in series to form a controlled branch, the main breaker between the wind generating set and a power grid is connected in parallel with the controlled branch, the converter comprises a rectifier, an inverter and a capacitor, a direct current positive bus and a direct current negative bus are arranged between the rectifier and the inverter, the capacitor and an unloading resistor are connected between the direct current positive bus and the direct current negative bus, the unloading resistor is connected in parallel with the capacitor, the unloading resistor is connected in series with a controlled valve for controlling the unloading resistor, the controlled valve is connected with the converter controller, the power grid end is connected with an alternating current voltage detector, and the direct current voltage detector is connected between the direct current positive bus and the direct current negative bus, the alternating voltage detector and the direct voltage detector are both connected with the low voltage ride through main controller, and the low voltage ride through main controller is connected with the converter controller, the main circuit breaker and the auxiliary circuit breaker; the low voltage ride through main controller comprises a starting control module and a wind generating set switching control module again, the fan main circuit breaker, the converter auxiliary circuit breaker, the alternating current voltage detector and the direct current voltage detector are all connected with the input end of the starting control module, and the output end of the starting control module is connected with the converter controller; the alternating voltage detector is connected with the input end of the wind generating set switching control module, and the output end of the wind generating set switching control module is connected with the converter controller, the main circuit breaker and the auxiliary circuit breaker respectively.
As a preferred solution: the controlled valve is an IGBT switch.
The technical conception of the utility model is as follows: in the process of low voltage ride through of the fixed pitch stall fan, the voltage of a power grid is reduced, so that the external electric energy transmission capacity of the unit is reduced, and the fan and a power system are connected with a figure 1 and an equivalent circuit diagram 2.
In fig. 1, G represents a wind turbine, L represents a cable between a wind turbine and a box transformer substation, and T represents a box transformer substation of the wind turbine.
In an electric power system, the capacity of a transmission line to transfer active power is:
Wherein:Eis the outlet end voltage of the unit;
Uthe voltage of the high-voltage side of the fan box transformer is also referred to as the network voltage;
Xin order to be able to transmit the impedance,
；
δfor the outlet end voltage of the unitAnd the network voltage
The phase difference between them.
The drop of the power grid voltage generally occurs in a medium-high voltage line, and under the condition, the voltage of the high-voltage side of the fan box is changed
And the wind driven generator is dropped, and the circuit breaker at the outlet of the wind driven generator is disconnected to maintain the voltage at the outlet end of the fan to be stable because the wind driven generator needs to complete low voltage ride through. When the voltage drops deeply, the transmission capacity of the line is greatly reduced, so that very large kinetic energy is accumulated in the unit in the voltage dropping process.
In the low-voltage ride-through process, mechanical energy accumulated on an impeller of a fixed-pitch stall wind driven generator cannot be transmitted outwards, and wind energy absorbed by the impeller cannot be reduced by adjusting the angle of the blade like a variable-pitch unit, so that electric energy which cannot be transmitted outwards by the unit during voltage drop is accumulated on the impeller as mechanical energy, the rotating speed of the impeller is increased, and runaway is caused in severe cases. In order to solve the problem of energy release in the voltage drop process, a converter is used in the low-voltage process, the converter on the wind power generator side is controlled to store certain energy on a direct-current side capacitor, and the capacity of the capacitor for storing energy is limited. In order to protect the wind turbine generator side converter and the direct current side, when the voltage of a direct current bus is set to exceed a set value, residual energy is consumed on a direct current resistor of the converter, and partial energy is transmitted to a power grid by the grid side converter, but the voltage of the rear end of a transformer depends on the voltage drop depth of the power grid, so that the electric energy transmitted by the grid side converter is limited, and the resistor R bears the main responsibility of energy consumption, and a general control principle block diagram 3 is shown.
The frequency converter PMW control can control the active power and the reactive power of the fan flowing into the power grid. Under a d-q-0 coordinate system, control parameters capable of representing modulation ratios and phase differences of the grid-side frequency converter 1 and the fan-side frequency converter 2 are adjusted
To realize the excitation voltage of the fan
And controlling the voltage of the direct current capacitor and adjusting the voltage of the grid-connected bus. The dynamic equation of the direct-current capacitor of the frequency converter is as follows:
wherein:
is a capacitance value;
The relationship between the control parameters and the AC/DC voltage during PWM control is as follows:
wherein:
is the input voltage of the power grid side frequency converter 1, pu;
is the capacitor nominal voltage, V.
Hysteresis control is adopted for a direct current side unloading circuit, for example: when the DC side voltage is greater thanWhen the load is applied, the unloading resistance on the DC side is less than
（
) The unloading resistance is cut off, and the control block diagram of the unloading circuit is shown in figure 4.
The direct-current side parameters of the converter are respectively rated voltages of the direct-current side
And maximum sustainable operating DC voltage
. Setting the DC side voltage to be greater than the maximum sustainable operation DC voltage
Then, putting an unloading resistor; less than rated voltage of DC side
The unload resistance is switched out.
The unloading resistor can ensure that the voltage of the direct current side is in a safe range, the resistance value is selected according to the maximum power to be consumed and the maximum voltage allowed by the direct current side, and the unloading resistor consumes the redundant energy of the direct current side in a heat energy mode.
At present, an estimation method is generally adopted for calculating the unloading resistance, mainly because part of parameters cannot be accurately measured. The unloading resistance parameters mainly comprise two important parameters of resistance value and power capacity. The resistance value of the unloading resistor is selected as follows:
first, when the discharge current is equal to half of the rated current of the fan, the same braking torque as the rated torque of the motor can be obtained, so the unloading resistance is roughly calculated as follows:
wherein,
for setting an upper limit for the DC voltage, i.e. the maximum sustainable operating DC voltage
；
The rated current of the fan.
Secondly, in order to ensure that the frequency converter is not damaged, the resistance value when the current flowing through the unloading resistor is the rated current is forcibly limited to be the minimum value of the unloading resistor. When the resistance value of the unloading resistor is selected, the resistance value cannot be smaller than the resistance value, and the calculation formula is as follows:
wherein,
for setting an upper limit for the DC voltage, i.e. the maximum sustainable operating DC voltage
；
In summary, the selection range of the resistance of the unloading resistor R is as follows:
the resistor value is selected to be a commercially available model.
According to the low-voltage ride-through transformation and control scheme, the method can well restrain the direct-current side voltage and the stator and rotor side currents no matter when the power grid voltage drops seriously for a short time or slowly for a long time. Meanwhile, the grid-side converter is controlled to send out reactive power, so that the voltage of the power grid is helped to recover to the maximum extent, and the stable and safe operation of the power grid is guaranteed.
The requirement of low voltage ride through of the fixed pitch wind generating set can be completely met, namely the low voltage ride through device is effectively suitable for deep voltage drop occasions; in the implementation process, the reactive power absorbed by the power grid is reduced, the voltage at the outlet end of the fan is stabilized, meanwhile, the active power and reactive power of the fan are greatly changed when the power grid recovers, and the stability of the power grid is enhanced.
The beneficial effects of the utility model are that: 1. the electronic switch component is used for fast switching, the response speed is high, the national standard low voltage ride through requirement is completely met, and even lower voltage is obtained; 2, the original system is little in modification workload and flexible to install; 3. the fan is enabled to normally operate in a low-voltage period in a mode of directly increasing voltage, and no impact is caused on the fan; 4. when the fan normally operates, the fan is directly connected to the grid for operation through the fan breaker, so that the loss is low, and almost no voltage drop exists.
Drawings
Fig. 1 is a connection diagram of a wind turbine and a power system.
FIG. 2 is an equivalent circuit diagram of a wind turbine and power system connection.
Fig. 3 is a diagram of the overall system control.
Fig. 4 is a dc side unloading control schematic diagram.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
Referring to fig. 1 to 4, a low voltage ride through control device of a wind generating set based on a converter comprises a converter, a converter controller and a low voltage ride through main controller, wherein the converter and an auxiliary breaker are connected in series to form a controlled branch, a main breaker between the wind generating set and a power grid is connected in parallel with the controlled branch, the converter comprises a rectifier, an inverter and a capacitor, a direct current positive bus and a direct current negative bus are arranged between the rectifier and the inverter, a capacitor and an unloading resistor are connected between the direct current positive bus and the direct current negative bus, the unloading resistor is connected in parallel with the capacitor, the unloading resistor is connected in series with a controlled valve for controlling the unloading resistor, the controlled valve is connected with the converter controller, the power grid end is connected with an alternating current voltage detector, and a direct current voltage detector is connected between the direct current positive bus and the direct current negative bus, the alternating voltage detector and the direct voltage detector are both connected with the low voltage ride through main controller, and the low voltage ride through main controller is connected with the converter controller, the main circuit breaker and the auxiliary circuit breaker;
the low voltage ride through master controller includes: the starting control module is used for monitoring the on-off of the fan main circuit breaker and the converter auxiliary circuit breaker after the voltage of the power grid drops, and simultaneously sending an instruction for closing the controlled valve to the converter controller when detecting that the direct-current voltage exceeds a preset direct-current voltage threshold; the wind generating set switching control module is used for sending a control instruction for adjusting the size, the phase and the frequency of exciting current to the converter controller when the AC voltage is detected to be recovered, sending a closing instruction to the main circuit breaker and sending an opening instruction to the auxiliary circuit breaker when the phase, the size and the frequency of the stator voltage of the wind generating set correspond to the phase, the size and the frequency of the grid voltage, and sending an instruction for opening the controlled valve to the converter controller;
the fan main circuit breaker, the converter auxiliary circuit breaker, the alternating current voltage detector and the direct current voltage detector are all connected with the input end of the starting control module, and the output end of the starting control module is connected with the converter controller; the alternating voltage detector is connected with the input end of the wind generating set switching control module, and the output end of the wind generating set switching control module is connected with the converter controller, the main circuit breaker and the auxiliary circuit breaker respectively.
The controlled valve is an IGBT switch.
In this embodiment, referring to fig. 3, the entire low voltage ride through retrofit and control scheme includes the newly added converter devices, the low voltage ride through master controller, and the converter controller of the converter. The installation position of the converter is connected with a main breaker of the fan in parallel; the low voltage ride through main controller is provided with an input port and an output port, can acquire a direct current side voltage value and a power grid voltage value of the converter, and can send a control command to control the on-off of the converter controller and directly control the main breaker of the fan and the auxiliary breakers of the power grid side converter of the converter so as to complete the low voltage ride through of the fixed pitch fan. The whole control process is realized as follows:
1) when the voltage of the power grid drops, the low-voltage ride-through main controller detects the voltage drop of the power grid through the voltage acquisition amount, a command of closing the auxiliary circuit breaker on the grid side of the converter is sent without delay, after the circuit breaker on the grid side of the converter is closed, the main circuit breaker of the fan is disconnected, and the fan is connected with the power grid through the converter.
2) When the breaker is opened and closed, the main controller strictly monitors whether the direct current bus voltage of the converter exceeds the upper limit of the direct current side voltage set value. Once the voltage exceeds the upper limit of the set value, the main controller sends a command to the converter controller, the converter controller sends a trigger pulse to the IGBT which is connected with the direct-current resistor in series, the IGBT is conducted, and the direct-current resistor is connected. The converter controller simultaneously coordinates the generator side converter to consume energy on the direct current resistance of the converter when the voltage of the power grid drops, and the grid side converter transmits partial energy to the power grid, but the electric energy transmitted by the grid side converter is limited, and the resistance R can bear the main responsibility of energy consumption.
3) And keeping the state until the main controller monitors that the voltage of the power grid recovers, and controlling the motor-side converter to adjust the exciting current, the phase and the frequency by the converter controller so that the phase, the magnitude and the frequency of the voltage of the stator of the generator strictly correspond to the phase, the magnitude and the frequency of the voltage of the power grid. Therefore, current impact during switching-on can be reduced, and influence on a power grid and damage to a fan are reduced.
4) After the fan is merged into the power grid, the main controller sends a command to disconnect the auxiliary circuit breaker on the grid side of the converter, the converter quits operation at the moment, pulses are sent to the IGBT through the frequency converter controller, the IGBT is turned off, the resistor quits operation, and the next time of use is waited.
5) And the fan is connected into the power grid to normally operate, and the low-voltage ride through process is ended.
Claims (2)
1. The utility model provides a wind generating set low voltage ride through controlling means based on converter which characterized in that: the low voltage ride through control device comprises a converter, a converter controller and a low voltage ride through main controller, wherein the converter and an auxiliary breaker are connected in series to form a controlled branch, a main breaker between a wind generating set and a power grid is connected in parallel with the controlled branch, the converter comprises a rectifier, an inverter and a capacitor, a direct current positive bus and a direct current negative bus are arranged between the rectifier and the inverter, the capacitor and an unloading resistor are connected between the direct current positive bus and the direct current negative bus, the unloading resistor is connected in parallel with the capacitor, the unloading resistor is connected in series with a controlled valve for controlling the switching of the unloading resistor, the controlled valve is connected with the converter controller, the power grid end is connected with an alternating current voltage detector, and the direct current voltage detector is connected between the direct current positive bus and the direct current negative bus; the low voltage ride through controller comprises a starting control module and a wind generating set switching control module again, the fan main circuit breaker, the converter auxiliary circuit breaker, the alternating current voltage detector and the direct current voltage detector are all connected with the input end of the starting control module, and the output end of the starting control module is connected with the converter controller; the alternating voltage detector is connected with the input end of the wind generating set switching control module, and the output end of the wind generating set switching control module is connected with the converter controller, the main circuit breaker and the auxiliary circuit breaker respectively.
2. The converter-based wind turbine generator system low voltage ride through control apparatus of claim 1, wherein: the controlled valve is an IGBT switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206108765U CN201904625U (en) | 2010-11-17 | 2010-11-17 | Low-voltage crossing controller of wind generating set based on converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206108765U CN201904625U (en) | 2010-11-17 | 2010-11-17 | Low-voltage crossing controller of wind generating set based on converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201904625U true CN201904625U (en) | 2011-07-20 |
Family
ID=44275218
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206108765U Expired - Lifetime CN201904625U (en) | 2010-11-17 | 2010-11-17 | Low-voltage crossing controller of wind generating set based on converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201904625U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102435882A (en) * | 2011-09-24 | 2012-05-02 | 国网电力科学研究院 | Passive reactor structure grid-connected photovoltaic inverter low voltage ride through detection device |
| CN103236711A (en) * | 2013-03-07 | 2013-08-07 | 曲阜师范大学 | Topological structure of high-voltage direct-current transformer for double-fed wind generator set |
| CN103414214A (en) * | 2013-08-30 | 2013-11-27 | 国家电网公司 | Low-voltage ride through and reactive power control system and method for asynchronous wind turbine generator |
| CN106602602A (en) * | 2016-12-28 | 2017-04-26 | 北京金风科创风电设备有限公司 | Converter controller, converter and control method for converter |
| CN109149641A (en) * | 2018-09-26 | 2019-01-04 | 湘电风能有限公司 | A kind of permanent-magnetic wind driven generator group realizes the device and control method of isolated operation |
-
2010
- 2010-11-17 CN CN2010206108765U patent/CN201904625U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102435882A (en) * | 2011-09-24 | 2012-05-02 | 国网电力科学研究院 | Passive reactor structure grid-connected photovoltaic inverter low voltage ride through detection device |
| CN103236711A (en) * | 2013-03-07 | 2013-08-07 | 曲阜师范大学 | Topological structure of high-voltage direct-current transformer for double-fed wind generator set |
| CN103236711B (en) * | 2013-03-07 | 2017-11-14 | 曲阜师范大学 | Double feed wind power generator group topological structure of high-voltage direct-current transformer |
| CN103414214A (en) * | 2013-08-30 | 2013-11-27 | 国家电网公司 | Low-voltage ride through and reactive power control system and method for asynchronous wind turbine generator |
| CN103414214B (en) * | 2013-08-30 | 2015-10-28 | 国家电网公司 | The low voltage crossing of asynchronous Wind turbines and powerless control system and method |
| CN106602602A (en) * | 2016-12-28 | 2017-04-26 | 北京金风科创风电设备有限公司 | Converter controller, converter and control method for converter |
| CN106602602B (en) * | 2016-12-28 | 2019-06-21 | 北京金风科创风电设备有限公司 | Wind power converter controller, wind power converter and control method of wind power converter |
| CN109149641A (en) * | 2018-09-26 | 2019-01-04 | 湘电风能有限公司 | A kind of permanent-magnetic wind driven generator group realizes the device and control method of isolated operation |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102005779A (en) | Converter-based low voltage ride through control system of wind generating set | |
| CN114825431B (en) | Grid-connected system and control and protection system for sending wind power plant out through diode rectification | |
| CN101710789B (en) | Megawatt-level permanent magnet direct-drive wind-force generating converter and control method | |
| CN103227477A (en) | High voltage ride through control method for double-fed wind generator | |
| CN107482653B (en) | The fluctuation of the direct current transportation Double-feed wind power power of the assembling unit and fault control system and method | |
| EP2525464A1 (en) | Control method for low voltage ride through | |
| CN102324754B (en) | Double-feed wind power generator low-voltage through control system based on energy storage device | |
| CN101091305A (en) | Method of controlling a wind turbine connected to an electric utility grid | |
| CN103795081B (en) | The control method of direct-driving type wind power system low voltage crossing | |
| CN103414205A (en) | Wind farm super capacitor energy storage type unified power quality conditioner | |
| CN105048497B (en) | Doubly-fed wind turbine generator low-voltage ride through method | |
| CN201904625U (en) | Low-voltage crossing controller of wind generating set based on converter | |
| CN102223125A (en) | Method and device for controlling uninterruptible operation of wind generator system in case of faulted power grid voltage | |
| CN103337871B (en) | Low voltage ride through circuit and corresponding control method for wind power generating set | |
| CN201570870U (en) | LVRT (low voltage ride-through) control apparatus and wind-power generation equipment | |
| CN108667033A (en) | Wind electric converter high voltage crossing control method and device based on Hysteresis control | |
| CN102223126A (en) | Variable resistor Crowbar structures for low-voltage ride-through of wind power generation and method for realizing variable resistor Crowbar structures | |
| CN112909990A (en) | Coordination control technical design scheme for improving fault ride-through capability of offshore wind power multi-terminal flexible-direct system | |
| CN102709944A (en) | Control method of low voltage through of wind driven generator set based on DGNR variable pitch system | |
| CN202633966U (en) | System for controlling low voltage ride through of aerogenerator | |
| CN203340017U (en) | Frequency control system for large-power brushless double-feed motor | |
| CN102790406B (en) | Doubly-fed converter with reliable low-voltage ride-through capacity | |
| WO2012134458A1 (en) | Dynamic braking and low voltage ride through | |
| CN102412597A (en) | Low voltage ride through control method and device for double-fed wind power generation system | |
| CN212183138U (en) | Low pressure passes through device based on novel crowbar |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110720 |