CN102709944B - Control method of low voltage through of wind driven generator set based on DGNR variable pitch system - Google Patents
Control method of low voltage through of wind driven generator set based on DGNR variable pitch system Download PDFInfo
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- CN102709944B CN102709944B CN201210169851.XA CN201210169851A CN102709944B CN 102709944 B CN102709944 B CN 102709944B CN 201210169851 A CN201210169851 A CN 201210169851A CN 102709944 B CN102709944 B CN 102709944B
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Abstract
The invention discloses a control method of low voltage ride through of a wind driven generator set based on a DGNR variable pitch system. Before the grid voltage declines, a main control system operates in a normal generation state; when the grid voltage declines, a LVRT (low voltage ride through) starting signal is detected by a converter; the main control system is triggered to enter the low voltage ride through state from the normal generation state according to the LVRT starting signal by the main control system triggers; faults relevant to the grid are shielded by adopting a manner of a filter; the converter and the variable pitch system are triggered to enter the low voltage ride through state; the variable pitch system feathers one time by the variable pitch battery energy till that the measured blade pitch angle of the variable pitch system is more than the set blade pitch angle of the variable pitch system; the blade brake and the variable pitch motor electromagnetic brake are controlled by the variable pitch system to perform braking; and the blade pitch angle is temporarily and firmly held to wait for the grid voltage recovery. The method is low in cost, good in applicability and strong in practicability.
Description
Technical field
The present invention relates to a kind of low voltage traversing control method of wind generator set.
Background technology
Double feed wind power generator group is the mainstream model of current MW class speed-variable frequency-constant wind-driven generator group, along with the raising of wind-powered electricity generation electrical network penetrance, be about to implement standard GB/T/T 19963 ?2011 " wind energy turbine set access power system technology regulation " clear stipulaties by be connected with electrical network newly-built of 110 (66) kV and above transmission line or extend wind energy turbine set wind turbine generator and must have low voltage ride-through capability (LVRT) in June, 2012.Low voltage crossing refers to that in the scope that certain voltage is fallen, wind turbine generator can not be run by off-grid continuously when electric network fault or disturbance cause the Voltage Drop of wind farm grid-connected point.
Pitch-controlled system is that one of important composition parts of wind turbine generator mainly contain two functions: (1) power-limiting exports: the above pitch-controlled system of rated wind speed reduces Wind energy extraction by adjusting vane propeller pitch angle, the torque of current transformer regulator generator, ensures wind turbine generator constant power output.(2) braking brake: when wind turbine generator disorderly closedown, pitch-controlled system controls blade pitch angle and goes to feather position, reduces wind and carries absorption to brake wind turbine generator.Before there is grid voltage sags, master control system operates in normal power generation state, and time below rated wind speed, current transformer controls generator torque according to master control system torque instruction and follows the tracks of wind speed change, follows the tracks of optimum Cp, obtains maximum power output; Time more than rated wind speed, master control system controls pitch-controlled system adjusting vane propeller pitch angle, reduces Wind energy extraction, ensures wind turbine generator constant power output.Pitch-controlled system, according to the change of wind, realizes automatically regulating continuously between service position and feather position, controls blade fast and stable ground and rotates to the given propeller pitch angle of master control system.
The critical piece of early stage wind generating set pitch control system driver is thyristor (SCR), as the DGNR 50Z of pitch-controlled system mainstream supplier SSB, cannot realize the two-way flow of energy.Namely traditional DGNR variable pitch driver just cannot normally work below grid voltage sags to 75% rated voltage, the energy of battery cannot be used to carry out the adjustment of blade angle, the energy content of battery can only be utilized to carry out feathering.Be considered to not possess LVRT ability.Later stage, pitch-controlled system mainly adopted H bridge bipolar system IGBT as power driver module, as the DCtransD60k of SSB due to the development of power electronic technology.Because it can directly utilize the energy content of battery to carry out the lasting adjustment of propeller pitch angle during Voltage Drop, realize seamless link and possess LVRT energy.Standard GB/T/T 19963 ?2011 to put into effect, early stage wind turbine generator of installing will realize LVRT function, is exactly the most directly the driver of replacing pitch-controlled system.Because pitch-controlled system drives, body strengthens, quality weight, wheel hub must be fallen down and can change driver, face the expense that expensive lifting cost is used and changed driver.
Summary of the invention
In order to the deficiency that the cost overcoming existing low voltage traversing control method of wind generator set is high, applicability is poor, the invention provides a kind of with low cost, low voltage traversing control method of wind generator set based on DGNR pitch-controlled system that applicability is good, practical.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of low voltage traversing control method of wind generator set based on DGNR pitch-controlled system, the described pitch-controlled system comprising a set of adjustment propeller pitch angle based on DGNR pitch-controlled system, the current transformer of a set of connection generator and electrical network, the master control system of a set of docking pitch-controlled system and current transformer;
Before grid voltage sags, described master control system operates in normal power generation state, and described pitch-controlled system regulates between service position and feather position continuously automatically according to the change of wind; During grid voltage sags, the LVRT enabling signal that described current transformer detects, described master control system is according to described LVRT enabling signal, trigger master control system and enter low voltage crossing state by normal power generation state, adopt the mode of filter to shield to the fault relevant with electrical network, and trigger described current transformer and described pitch-controlled system enters low voltage crossing state;
Described pitch-controlled system first utilizes and becomes oar energy content of battery feathering once, until when the propeller pitch angle of described pitch-controlled system actual measurement is greater than described pitch-controlled system given propeller pitch angle, the blade brake and the pitch motor electromagnetic brake that control described pitch-controlled system perform brake, propeller pitch angle is temporarily embraced jail, waits for that line voltage recovers;
After line voltage recovers, described master control system recovers described pitch-controlled system and described current transformer is normal power generation state, and it is given to recover unit active power, final recovery normal power generation state.
Further, in described pitch-controlled system, after feathering once completes, if line voltage does not recover, and fall depth down, cause generator speed again to rise, when namely described master control system detects that described pitch-controlled system actual angle is less than the given angle of propeller pitch angle closed-loop control, the brake of control blade and pitch motor brake are unclamped, again perform feathering once, until actual angle is greater than given propeller pitch angle again, brake is embraced again, waits for the recovery of line voltage.
Further again, if in low voltage crossing process, if any fault being more than or equal to orderly closedown occurs unit, then jump out low voltage crossing state machine immediately, perform shutdown.
Further, described pitch-controlled system comprises electrical net detect module, after described electrical net detect module monitors to the falling of line voltage, trigger pitch-controlled system internal delay time relay and start timing, if line voltage does not recover within the time that time delay relay is arranged, be directly switch into powered battery loop, carry out feathering by battery, wind turbine generator rotating speed is down in safe range.
Technical conceive of the present invention is: the present invention utilizes grid voltage sags, causes generator electromagnetic torque to reduce, causes generator speed to rise, and controls the blade brake of pitch-controlled system and pitch motor brake and indirectly realize the control of propeller pitch angle by master control system.
Before grid voltage sags, described pitch-controlled system operates in normal power generation state.When grid voltage sags, described pitch-controlled system, according to the status command of described master control, triggers described pitch-controlled system and enters LVRT state, the difference of described pitch-controlled system deep according to Voltage Drop, shallow and duration, perform feathering 2 times or feathering 1 time, or fault cuts out action.When line voltage recovers, described pitch-controlled system recovers normal operating condition according to the given instruction of described master control system propeller pitch angle.
Beneficial effect of the present invention is mainly manifested in: 1) the present invention is based upon in the 1.5MW double-feedback aerogenerator group of DGNR pitch-controlled system, it adopts master control system, current transformer, DGNR pitch-controlled system to realize carrying out change oar to double-feedback aerogenerator group LVRT and controls, therefore achieve widely used performance, and there is stronger practicality.2) the present invention is during LVRT, owing to adopting master control system, award setting is carried out to pitch-controlled system, achieve, to during fault-signal shielding, low voltage crossing, closed-loop control is carried out to torque and propeller pitch angle, and Real-Time Monitoring signal condition, therefore ensure that fan operation does not exceed the speed limit, achieve wind turbine generator not off-grid run continuously.3) the present invention is owing to have employed master control system state machine switches, status signal detection, fault-signal shielding, award setting technology, detected by signal condition and realize starting LVRT state and terminating, normal power generation and the switching of LVRT state is completed by master control system state machine, and in LVRT state, realize the shielding of fault-signal and torque ring, propeller pitch angle closed-loop control, thus ensure that wind turbine generator is run in LVRT process and do not exceed the speed limit, ensure that unit is at not off-grid continuous service.The present invention can be widely used in wind-powered electricity generation industry.
Accompanying drawing explanation
Fig. 1 is the structural representation of dual-feed asynchronous wind power generator group.
Fig. 2 is master control system LVRT flow chart.
Fig. 3 is current transformer LVRT flow chart.
Fig. 4 is pitch-controlled system LVRT flow chart.
Fig. 5 is the darker pitch-controlled system feathering of grid voltage sags 2 times, and propeller pitch angle and EFC and pine are stopped signal controlling logic relation picture.
Fig. 6 is the more shallow pitch-controlled system feathering of grid voltage sags 1 time, and propeller pitch angle and EFC and pine are stopped signal controlling logic relation picture.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
With reference to Fig. 1 ~ Fig. 6, a kind of low voltage traversing control method of wind generator set based on DGNR pitch-controlled system, the described pitch-controlled system comprising a set of adjustment propeller pitch angle based on DGNR pitch-controlled system, the current transformer of a set of connection generator and electrical network, the master control system of a set of docking pitch-controlled system and current transformer;
Before grid voltage sags, described master control system operates in normal power generation state, and described pitch-controlled system regulates between service position and feather position continuously automatically according to the change of wind; During grid voltage sags, the LVRT enabling signal that described current transformer detects, described master control system is according to described LVRT enabling signal, trigger master control system and enter low voltage crossing state by normal power generation state, adopt the mode of filter to shield to the fault relevant with electrical network, and trigger described current transformer and described pitch-controlled system enters low voltage crossing state;
Described pitch-controlled system first utilizes and becomes oar energy content of battery feathering once, until when the propeller pitch angle of described pitch-controlled system actual measurement is greater than described pitch-controlled system given propeller pitch angle, the blade brake and the pitch motor electromagnetic brake that control described pitch-controlled system perform brake, propeller pitch angle is temporarily embraced jail, waits for that line voltage recovers;
After line voltage recovers, described master control system recovers described pitch-controlled system and described current transformer is normal power generation state, and it is given to recover unit active power, final recovery normal power generation state.
Further, in described pitch-controlled system, after feathering once completes, if line voltage does not recover, and fall depth down, cause generator speed again to rise, when namely described master control system detects that described pitch-controlled system actual angle is less than the given angle of propeller pitch angle closed-loop control, the brake of control blade and pitch motor brake are unclamped, again perform feathering once, until actual angle is greater than given propeller pitch angle again, brake is embraced again, waits for the recovery of line voltage.
Further again, if in low voltage crossing process, if any fault being more than or equal to orderly closedown occurs unit, then jump out low voltage crossing state machine immediately, perform shutdown.
Further, described pitch-controlled system comprises electrical net detect module, after described electrical net detect module monitors to the falling of line voltage, trigger pitch-controlled system internal delay time relay and start timing, if line voltage does not recover within the time that time delay relay is arranged, be directly switch into powered battery loop, carry out feathering by battery, wind turbine generator rotating speed is down in safe range.
Current transformer side changes passive Crowbar into active C rowbar, and increase UPS capacity, during Low Dropout, current transformer side control loop is powered by UPS.
Pitch-controlled system increases by 3 time-delay relays, and seal in EFC (emergency feathering signal) signal, when pitch-controlled system driver does not recover normal work during Voltage Drop in time-delay relay setting-up time, then time-delay relay is according to the feedback signal (BTB signal) of variable pitch driver, directly by battery-operated feathering; The control loops such as motor excess temperature module 220V powers by pitch-controlled system inside, battery charger change UPS into and power.
Master control system member control circuit is former is not that UPS powers, and now changes into and being powered by UPS; Change UPS feedback signal logic: during LVRT; UPS is caused to shut down regardless of due to what reason; before UPS shutdown, 10min sends " UPS protects shutdown " signal to master control system, makes master control system have sufficient time to perform the storage of stopping process and related data.
Receive the GridLowVoltageMonitor grid voltage sags abnormal signal of current transformer when master control system and do to judge, if GridTransientError unequal to PcsLowVoltageRideThroughOutOfRange continues 1s, then think that line voltage is abnormal, trigger GridLowVoltageMonitor;
In the various embodiments described above, the variable pitch driver that the BTB abnormal signal of shield driver causes, become oar battery, pitch motor fault of cooling fan; (TorqueMisMatch) fault is not mated in shielding torque, shielding electrical network phase shift (GridVectorSurge), mains frequency too high (GridFrequencyHigh), mains frequency too low (GridFrequencyLow) fault, and forbid driftage, fault masking adopts delayed alarm mode.
Before LVRT, pitch-controlled system operates in pitch-controlled system enabled state, now EFC=1, break release=1, pitch-controlled system brake is in pine and stops the automatic adjustment state of propeller pitch angle, when after GridLowVoltageMonitor grid voltage sags abnormal signal current transformer being detected, pitch-controlled system enters LVRT state.First carry out feathering one-off, when detecting that actual blade pitch angle is greater than given propeller pitch angle, by EFC=1, release break=0, performing and embracing firm propeller pitch angle, until actual blade pitch angle equals given propeller pitch angle; If line voltage does not recover in time, generator speed rises again, when the actual blade pitch angle detected is less than given propeller pitch angle by EFC=0, releasebreak=0, performs the action of battery feathering, so repeatedly again, until line voltage recovers, as shown in Figure 5.If grid voltage sags is more shallow, propeller pitch angle feathering once rear actual blade pitch angle is just greater than given propeller pitch angle until line voltage recovers always, only needs feathering action once, as shown in Figure 6 during such LVRT.
LVRT starts at grid voltage sags moment ton, terminates tend when line voltage returns to 90%Un, and when line voltage returns to 75%Un, variable pitch driver recovers normal work, starts to follow given propeller pitch angle and regulates.Because the actuating of relay time delay of two in pitch-controlled system loop adds that the loose action delay of stopping of brake has the start-up study Ton of 270ms during feathering, the same stopping time delay Toff also having the 160ms time at pitch-controlled system band-type brake, add the feathering and armful jail time that become oar, in the 3s clock of whole LVRT process, feathering number of times is no more than 2 times.
During LVRT, be in any state in above-mentioned armful of jail, feathering, wait state regardless of pitch-controlled system; As long as detect that line voltage returns to 0.75Un, pitch-controlled system driver BTB feedback signal is recovered, and master control system by EFC=1, release break=1, and jumps out LVRT state, and given position instruction starts to recover to become oar;
After electric network fault triggers LVRT, master control system enters low voltage crossing state " LowVoltageRideThroughState " by generating state " Power production ", first carry out feathering one-off, when actual blade pitch angle is greater than given propeller pitch angle, releasebrake signal is set to 0 and performs blade brake, until pitch-controlled system recovers normal (pitch-controlled system state machine 12); When electric network fault recovers; master control system enters " LowVoltageRideThroughIncrease " according to the LVRT end signal received from current transformer side joint; send the finish command signal to pitch-controlled system and current transformer simultaneously; when the BTB signal of detection three axles is all normal; master control system jumps out LVRT state machine; rebound " powerprduction " state; whole system recovers normal power generation state; starting " becoming oar halt command " makes motor pine stop; and send propeller pitch angle instruction, recover normal power generation.
When line voltage falls outside the voltage curve current transformer setting, can cause undervoltage warning, namely UnderLineVoltOutOfRange triggers electric network fault shutdown; Under the voltage lowest curve that line voltage drops to master controller setting, GridPhaseDrop electric network fault can be triggered and shut down; And the time fallen is longer than setting curve, can trigger A_GridVoltageLow electric network fault and shut down, master control system state machine skips to electric network power-fail stopped status from low voltage crossing state.During LVRT, as long as the fault that the grade that breaks down is more than or equal to orderly closedown is raw, then LVRT state machine is jumped out in master control, performs corresponding shutdown action;
The various embodiments described above only all can change to some extent for illustration of the structure of each parts of the present invention, size, setting position and shape; pitch-controlled system is the DGNR pitch-controlled system that backup battery is powered; on the basis of technical solution of the present invention; all improvement of carrying out individual part according to the principle of the invention and equivalents, all should not get rid of outside protection scope of the present invention.
Claims (1)
1. the low voltage traversing control method of wind generator set based on DGNR pitch-controlled system, it is characterized in that: the described pitch-controlled system comprising a set of adjustment propeller pitch angle based on DGNR pitch-controlled system, its critical piece is thyristor (SCR), the current transformer of a set of connection generator and electrical network, the master control system of a set of docking pitch-controlled system and current transformer; Before grid voltage sags, described master control system operates in normal power generation state, and described pitch-controlled system regulates between service position and feather position continuously automatically according to the change of wind; During grid voltage sags, the LVRT enabling signal that described current transformer detects, described master control system is according to described LVRT enabling signal, trigger master control system and enter low voltage crossing state by normal power generation state, adopt the mode of filter to shield to the fault relevant with electrical network, and trigger described current transformer and described pitch-controlled system enters low voltage crossing state; Described pitch-controlled system first utilizes and becomes oar energy content of battery feathering once, until when the propeller pitch angle of described pitch-controlled system actual measurement is greater than described pitch-controlled system given propeller pitch angle, the blade brake and the pitch motor electromagnetic brake that control described pitch-controlled system perform brake, propeller pitch angle is temporarily embraced jail, waits for that line voltage recovers; After line voltage recovers, described master control system recovers described pitch-controlled system and described current transformer is normal power generation state, and it is given to recover unit active power, final recovery normal power generation state; In described pitch-controlled system, after feathering once completes, if line voltage does not recover, and fall depth down, cause generator speed again to rise, namely when described master control system detects that described pitch-controlled system actual angle is less than the given angle of propeller pitch angle closed-loop control, the brake of control blade and pitch motor brake are unclamped, and again perform feathering once, until actual angle is greater than given propeller pitch angle again, brake is embraced again, waits for the recovery of line voltage; If in low voltage crossing process, if any fault being more than or equal to orderly closedown occurs unit, then jump out low voltage crossing state machine immediately, perform shutdown; Described pitch-controlled system comprises electrical net detect module, after described electrical net detect module monitors to the falling of line voltage, trigger pitch-controlled system internal delay time relay and start timing, if line voltage does not recover within the time that time-delay relay is arranged, be directly switch into powered battery loop, carry out feathering by battery, wind turbine generator rotating speed is down in safe range.
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| US9413217B2 (en) | 2012-06-28 | 2016-08-09 | General Electric Company | Electromagnetic braking systems and methods |
| US9407187B2 (en) | 2012-06-28 | 2016-08-02 | General Electric Company | System and method for improving response time of a braking unit |
| US9601918B2 (en) | 2012-06-28 | 2017-03-21 | General Electric Company | Systems and methods for controlling acceleration of a power generator |
| CN104202395B (en) * | 2014-09-01 | 2017-12-19 | 中国东方电气集团有限公司 | A kind of GPRS link establishments and the state machine implementation method for keeping task |
| CN104242346B (en) * | 2014-09-19 | 2017-07-14 | 许继集团有限公司 | A kind of LVRT Capability of Wind Turbine Generator control method |
| CN108177785A (en) * | 2017-12-07 | 2018-06-19 | 中国航空工业集团公司西安航空计算技术研究所 | A kind of propeller autofeather control method based on state machine |
| CN109931217B (en) * | 2017-12-15 | 2020-05-12 | 新疆金风科技股份有限公司 | Wind generating set shutdown control method and system |
| CN110138012A (en) * | 2019-06-18 | 2019-08-16 | 天津瑞源电气有限公司 | A kind of high-voltage ride through of wind power generating set control method, device and equipment |
| CN110533092B (en) * | 2019-08-23 | 2022-04-22 | 西安交通大学 | Wind generating set SCADA data classification method based on operation condition and application |
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| CN101299540A (en) * | 2007-04-30 | 2008-11-05 | 国网南京自动化研究院 | Apparatus for implementing low voltage cross-over of wind generator set |
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