CN102709944A - 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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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
The double feed wind power generator group is the mainstream model of present 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 19963-2011 " wind energy turbine set inserts the power system technology regulation " and clearly stipulate to have low voltage ride-through capability (LVRT) through the newly-built or enlarging wind energy turbine set wind turbine generator that 110 (66) kV and above electric pressure transmission line are connected with electrical network in June, 2012.Low-voltage is passed through and is meant that in the scope that certain voltage is fallen, wind turbine generator not off-grid is moved continuously when electric network fault or disturbance cause the electric voltage dropping of wind farm grid-connected point.
One of important composition parts that pitch-controlled system is wind turbine generator mainly contain two functions: the output of (1) power-limiting: the above pitch-controlled system of rated wind speed reduces wind energy through the adjusting vane propeller pitch angle and catches; The torque of current transformer regulator generator guarantees the permanent power output of wind turbine generator.(2) braking brake: when the wind turbine generator disorderly closedown, pitch-controlled system control blade pitch angle goes to feather position, and minimizing wind carries to absorb brakes wind turbine generator.Before electric network electric voltage drop took place, master control system operated in the normal power generation state, and when rated wind speed was following, current transformer changeed apart from following the tracks of wind speed according to master control system torque instruction control generator and changes, and follows the tracks of optimum Cp, obtains maximum power output; Master control system control pitch-controlled system adjusting vane propeller pitch angle reduces wind energy and catches when rated wind speed is above, guarantees the permanent power output of wind turbine generator.Pitch-controlled system is realized regulating automatically continuously between service position and feather position according to the variation of wind, rotates to the given propeller pitch angle of master control system control blade fast and stable.
The critical piece of early stage wind generating set pitch control system driver is thyristor (SCR), and the DGNR 50Z like pitch-controlled system mainstream supplier SSB can't realize the two-way flow of energy.Be that traditional DGNR variable pitch driver just can't operate as normal below electric network electric voltage drop to 75% rated voltage, can't use the energy of battery to carry out the adjusting of blade angle, can only utilize the energy content of battery to carry out feathering.Be considered to not possess the LVRT ability.Later stage, pitch-controlled system mainly adopted H bridge bipolar system IGBT as power driver module, like the DCtransD60k of SSB owing to the development of power electronic technology.Because it can directly utilize the energy content of battery to carry out the lasting adjusting of propeller pitch angle, realize that seamless link possesses the LVRT energy during electric voltage dropping.Standard GB/T 19963-2011 puts into effect, and early stage wind turbine generator of installing will realize the LVRT function, the most directly is exactly the driver of changing pitch-controlled system.Body strengthens, quality is heavy owing to pitch-controlled system drives, and must wheel hub be fallen down and can change driver, faces the expense that driver was used and changed to expensive lifting cost.
Summary of the invention
For high, the relatively poor deficiency of applicability of cost that overcomes existing low voltage traversing control method of wind generator set, the present invention provides a kind of with low cost, low voltage traversing control method of wind generator set based on the 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 the DGNR pitch-controlled system; The said pitch-controlled system that comprises a cover adjusting propeller pitch angle based on the DGNR pitch-controlled system; One interlocks the current transformer of sending and receiving motor and electrical network, the master control system of a cover butt joint pitch-controlled system and current transformer;
Before the electric network electric voltage drop, said master control system operates in the normal power generation state, and said pitch-controlled system is regulated between service position and feather position according to the variation of wind continuously automatically; During electric network electric voltage drop; The detected LVRT enabling signal of said current transformer; Said master control system is according to said LVRT enabling signal; Trigger master control system and get into low-voltage by the normal power generation state and pass through state, adopt the mode of filter to shield, and trigger said current transformer and said pitch-controlled system entering low-voltage is passed through state the fault relevant with electrical network;
Said pitch-controlled system utilizes earlier and becomes oar energy content of battery feathering once; Until the propeller pitch angle of said pitch-controlled system actual measurement during greater than the given propeller pitch angle of said pitch-controlled system; Control the blade brake of said pitch-controlled system and become the oar motor electromagnetic brake and carry out brake; Propeller pitch angle is temporarily embraced the jail, wait for that line voltage recovers;
After line voltage recovered, said master control system recovers said pitch-controlled system and said current transformer is the normal power generation state, and it is given to recover unit active power, finally recovers the normal power generation state.
Further, in the said pitch-controlled system, after feathering is once accomplished; If line voltage does not recover, and fall the degree of depth and deepen, cause generator speed to rise once more; Be said master control system when detecting said pitch-controlled system actual angle greater than the given angle of propeller pitch angle closed-loop control, control blade brake and become the brake of oar motor and unclamps is carried out feathering once once more; Once more less than given propeller pitch angle, brake is embraced once more until actual angle, waits for the recovery of line voltage.
Further again, if in the low-voltage crossing process,, then jump out low-voltage immediately and pass through state machine if any fault more than or equal to orderly closedown takes place unit, carry out and shut down.
Further; Said pitch-controlled system comprises the electrical network detection module, after said electrical network detection module monitors falling of line voltage, triggers pitch-controlled system internal delay time relay and picks up counting; If line voltage did not recover in the time that time delay relay is provided with; Be directly switch into the powered battery loop, carry out feathering, make the wind turbine generator speed drop to safe range by battery.
Technical conceive of the present invention is: the present invention utilizes electric network electric voltage drop, causes that the generator electromagnetic torque reduces, and causes generator speed to rise, and controls the blade brake of pitch-controlled system and becomes the oar motor brake control of realization propeller pitch angle indirectly through master control system
Before the electric network electric voltage drop, said pitch-controlled system operates in the normal power generation state.When electric network electric voltage drop; Said pitch-controlled system is according to the status command of said master control, triggers said pitch-controlled system and gets into the LVRT state, and said pitch-controlled system is according to deep, shallow different with the duration of electric voltage dropping; Carry out feathering 2 times or feathering 1 time, perhaps fault cuts out action.When the line voltage recovery, given instruction recovers normal operating condition to said pitch-controlled system according to said master control system propeller pitch angle.
Beneficial effect of the present invention mainly shows: 1) the present invention is based upon on 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 double-feedback aerogenerator group LVRT is become oar control; Therefore realize widely used performance, and had stronger practicality.2) the present invention is during LVRT; Owing to adopt master control system pitch-controlled system is carried out propeller pitch angle control; During having realized fault-signal shielding, low-voltage passed through closed-loop control is carried out in torque and propeller pitch angle; And real-time monitor signal state, therefore guaranteed that fan operation does not exceed the speed limit, realized wind turbine generator not off-grid move continuously.3) the present invention is owing to adopted the switching of master control system state machine, status signal detection, fault-signal shielding, propeller pitch angle control technology; Detecting realization by signal condition starts and finishes the LVRT state; Accomplish normal power generation and the switching of LVRT state through the master control system state machine; And in the LVRT state, realize shielding and torque ring, the propeller pitch angle closed-loop control of fault-signal, thereby having guaranteed that wind turbine generator is moved in the LVRT process does not exceed the speed limit, and has guaranteed that unit is at off-grid continuous service not.The present invention can be widely used in the wind-powered electricity generation industry.
Description of drawings
Fig. 1 is the structural representation of dual-feed asynchronous wind power generator group.
Fig. 2 is a master control system LVRT flow chart.
Fig. 3 is a current transformer LVRT flow chart.
Fig. 4 is a pitch-controlled system LVRT flow chart.
Fig. 5 is the dark pitch-controlled system feathering of electric network electric voltage drop 2 times, propeller pitch angle and EFC and the pine signal controlling logic relation picture of stopping.
Fig. 6 is the more shallow pitch-controlled system feathering of electric network electric voltage drop 1 time, propeller pitch angle and EFC and the pine signal controlling logic relation picture of stopping.
Embodiment
Below in conjunction with accompanying drawing the present invention is further described.
With reference to Fig. 1～Fig. 6; A kind of low voltage traversing control method of wind generator set based on the DGNR pitch-controlled system; The said pitch-controlled system that comprises a cover adjusting propeller pitch angle based on the DGNR pitch-controlled system; One interlocks the current transformer of sending and receiving motor and electrical network, the master control system of a cover butt joint pitch-controlled system and current transformer;
Before the electric network electric voltage drop, said master control system operates in the normal power generation state, and said pitch-controlled system is regulated between service position and feather position according to the variation of wind continuously automatically; During electric network electric voltage drop; The detected LVRT enabling signal of said current transformer; Said master control system is according to said LVRT enabling signal; Trigger master control system and get into low-voltage by the normal power generation state and pass through state, adopt the mode of filter to shield, and trigger said current transformer and said pitch-controlled system entering low-voltage is passed through state the fault relevant with electrical network;
Said pitch-controlled system utilizes earlier and becomes oar energy content of battery feathering once; Until the propeller pitch angle of said pitch-controlled system actual measurement during greater than the given propeller pitch angle of said pitch-controlled system; Control the blade brake of said pitch-controlled system and become the oar motor electromagnetic brake and carry out brake; Propeller pitch angle is temporarily embraced the jail, wait for that line voltage recovers;
After line voltage recovered, said master control system recovers said pitch-controlled system and said current transformer is the normal power generation state, and it is given to recover unit active power, finally recovers the normal power generation state.
Further, in the said pitch-controlled system, after feathering is once accomplished; If line voltage does not recover, and fall the degree of depth and deepen, cause generator speed to rise once more; Be said master control system when detecting said pitch-controlled system actual angle greater than the given angle of propeller pitch angle closed-loop control, control blade brake and become the brake of oar motor and unclamps is carried out feathering once once more; Once more less than given propeller pitch angle, brake is embraced once more until actual angle, waits for the recovery of line voltage.
Further again, if in the low-voltage crossing process,, then jump out low-voltage immediately and pass through state machine if any fault more than or equal to orderly closedown takes place unit, carry out and shut down.
Further; Said pitch-controlled system comprises the electrical network detection module, after said electrical network detection module monitors falling of line voltage, triggers pitch-controlled system internal delay time relay and picks up counting; If line voltage did not recover in the time that time delay relay is provided with; Be directly switch into the powered battery loop, carry out feathering, make the wind turbine generator speed drop to safe range by battery.
The current transformer side changes passive Crowbar into active C rowbar, increases the UPS capacity, and current transformer side control loop was supplied power by UPS during low-voltage was fallen.
Pitch-controlled system increases by 3 time-delay relays; And seal in EFC (the urgent feathering signal) signal; When the pitch-controlled system driver is not recovering operate as normal during the electric voltage dropping in the 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; Pitch-controlled system inside changes control loops such as motor excess temperature module 220V power supply, battery charger into the UPS power supply.
Master control system part control circuit is former not to be the UPS power supply, changes into by UPS at present and supplying power; Change UPS feedback signal logic: during LVRT; No matter owing to what reason causes the UPS shutdown; 10min sends " UPS protects shutdown " signal and gives master control system before the UPS shutdown, makes master control system have sufficient time to carry out the storage of stopping process and related data.
=PcsLowVoltageRideThroughOutOfRange continues 1s, thinks that then line voltage is unusual, triggers GridLowVoltageMonitor;
Among above-mentioned each embodiment, the variable pitch driver that the BTB abnormal signal of shielding driver causes, change oar battery, change oar motor fault of cooling fan; Shielding torque (TorqueMisMatch) fault that do not match; Shielding electrical network phase shift (GridVectorSurge), mains frequency too high (GridFrequencyHigh), mains frequency low excessively (GridFrequencyLow) fault; And forbid driftage, fault masking adopts the delayed alarm mode.
Pitch-controlled system operates in the pitch-controlled system enabled before LVRT; This moment EFC=1; Break release=1; Pitch-controlled system brake is in the pine automatic adjustment state of propeller pitch angle of stopping, and behind the GridLowVoltageMonitor electric network electric voltage drop abnormal signal that detects current transformer, pitch-controlled system gets into the LVRT state.Carry out feathering earlier and once move, when detecting the actual blade pitch angle greater than given propeller pitch angle, with EFC=1, release break=0 carries out and embraces firm propeller pitch angle, equals given propeller pitch angle until the actual blade pitch angle; If line voltage in time recovers, generator speed rises once more, when detected actual blade pitch angle during less than given propeller pitch angle with EFC=0; Release break=0 carries out the action of battery feathering, so repeatedly once more; Recover until line voltage, shown in accompanying drawing 5.If electric network electric voltage drop is more shallow, the propeller pitch angle feathering once just recovers until line voltage greater than given propeller pitch angle at actual blade pitch angle, back always, only needs the feathering action once during the LVRT like this, shown in accompanying drawing 6.
LVRT begins at electric network electric voltage drop moment ton, finishes tend when line voltage returns to 90%Un, and when line voltage returned to 75%Un, variable pitch driver recovered operate as normal, begins to follow given propeller pitch angle and regulates.Two actuating of relay time-delays in during feathering because the pitch-controlled system loop add the startup time-delay Ton of the loose total 270ms of action delay that stops of brake; Same braking at the pitch-controlled system band-type brake also has the Toff that delays time that stops of 160ms time; Add the feathering and an armful jail time that become oar; In the 3s of whole LVRT process clock, the feathering number of times is no more than 2 times.
During LVRT, no matter pitch-controlled system is in the arbitrary state in above-mentioned armful of jail, feathering, the wait state; Return to 0.75Un as long as detect line voltage, pitch-controlled system driver BTB feedback signal is recovered, and master control system is EFC=1, release break=1, and jump out the LVRT state, the given position instruction begins to recover to become oar;
After electric network fault triggers LVRT; Master control system gets into low-voltage by generating state " Power production " and passes through state " LowVoltageRideThroughState "; Carrying out feathering earlier once moves; When actual blade pitch angle during greater than given propeller pitch angle, the releasebrake signal is put 0 carry out the blade brake, recover normal (pitch-controlled system state machine 12) until pitch-controlled system; When electric network fault recovers; Master control system gets into " LowVoltageRideThroughIncrease " according to the LVRT end signal of receiving from the current transformer side joint, sends the finish command signal for simultaneously pitch-controlled system and current transformer, when the BTB signal of three axles of detection all just often; Master control system is jumped out the LVRT state machine; Rebound " powerprduction " state, whole system is recovered the normal power generation state, starts " becoming the oar halt command " the motor pine is stopped; And send the propeller pitch angle instruction, recover normal power generation.
Outside line voltage falls the voltage curve that the current transformer setting, can cause undervoltage warning, promptly UnderLineVoltOutOfRange triggers the electric network fault shutdown; Drop to when line voltage under the voltage lowest curve of master controller setting, can trigger the GridPhaseDrop electric network fault and shut down; And the time of falling is longer than setting curve, can trigger the A_GridVoltageLow electric network fault and shut down, and the master control system state machine passes through state from low-voltage and skips to the electric network power-fail stopped status.During LVRT, as long as the grade that breaks down is given birth to more than or equal to the fault of orderly closedown, then the LVRT state machine is jumped out in master control, carries out the corresponding action of shutting down;
Above-mentioned each embodiment only be used to explain each parts of the present invention structure, size, the position is set and shape all can change to some extent; Pitch-controlled system is the DGNR pitch-controlled system of backup battery power supply; On the basis of technical scheme of the present invention; All improvement and equivalents of individual component being carried out according to the principle of the invention all should not got rid of outside protection scope of the present invention.
Claims (4)
1. low voltage traversing control method of wind generator set based on the DGNR pitch-controlled system; It is characterized in that: the said pitch-controlled system that comprises a cover adjusting propeller pitch angle based on the DGNR pitch-controlled system; One interlocks the current transformer of sending and receiving motor and electrical network, the master control system of a cover butt joint pitch-controlled system and current transformer;
Before the electric network electric voltage drop, said master control system operates in the normal power generation state, and said pitch-controlled system is regulated between service position and feather position according to the variation of wind continuously automatically; During electric network electric voltage drop; The detected LVRT enabling signal of said current transformer; Said master control system is according to said LVRT enabling signal; Trigger master control system and get into low-voltage by the normal power generation state and pass through state, adopt the mode of filter to shield, and trigger said current transformer and said pitch-controlled system entering low-voltage is passed through state the fault relevant with electrical network;
Said pitch-controlled system utilizes earlier and becomes oar energy content of battery feathering once; Until the propeller pitch angle of said pitch-controlled system actual measurement during greater than the given propeller pitch angle of said pitch-controlled system; Control the blade brake of said pitch-controlled system and become the oar motor electromagnetic brake and carry out brake; Propeller pitch angle is temporarily embraced the jail, wait for that line voltage recovers;
After line voltage recovered, said master control system recovers said pitch-controlled system and said current transformer is the normal power generation state, and it is given to recover unit active power, finally recovers the normal power generation state.
2. the low voltage traversing control method of wind generator set based on the DGNR pitch-controlled system as claimed in claim 1 is characterized in that: in the said pitch-controlled system, after feathering is once accomplished; If line voltage does not recover, and fall the degree of depth and deepen, cause generator speed to rise once more; Be that said master control system is when detecting said pitch-controlled system actual angle greater than the given angle of propeller pitch angle closed-loop control; Control blade brake and become the brake of oar motor and unclamps is carried out feathering once once more, until actual angle once more less than given propeller pitch angle; Brake is embraced once more, waits for the recovery of line voltage.
3. according to claim 1 or claim 2 low voltage traversing control method of wind generator set based on the DGNR pitch-controlled system; It is characterized in that: if in the low-voltage crossing process; If any fault more than or equal to orderly closedown takes place in unit, then jump out low-voltage immediately and pass through state machine, carry out and shut down.
4. according to claim 1 or claim 2 low voltage traversing control method of wind generator set based on the DGNR pitch-controlled system; It is characterized in that: said pitch-controlled system comprises the electrical network detection module; After said electrical network detection module monitors falling of line voltage; Trigger pitch-controlled system internal delay time relay and pick up counting,, be directly switch into the powered battery loop in the time that time delay relay is provided with if line voltage does not recover; Carry out feathering by battery, make the wind turbine generator speed drop to safe range.
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| CN104202395A (en) * | 2014-09-01 | 2014-12-10 | 中国东方电气集团有限公司 | State machine implementation method for establishing GPRS link and keeping task |
| CN104242346A (en) * | 2014-09-19 | 2014-12-24 | 许继集团有限公司 | Low voltage ride-through control method of wind generation set |
| US9407187B2 (en) | 2012-06-28 | 2016-08-02 | General Electric Company | System and method for improving response time of a braking unit |
| US9413217B2 (en) | 2012-06-28 | 2016-08-09 | General Electric Company | Electromagnetic braking systems and methods |
| US9601918B2 (en) | 2012-06-28 | 2017-03-21 | General Electric Company | Systems and methods for controlling acceleration of a power generator |
| 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 |
| CN109931217A (en) * | 2017-12-15 | 2019-06-25 | 新疆金风科技股份有限公司 | Wind power generating set halt 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 |
| CN110533092A (en) * | 2019-08-23 | 2019-12-03 | 西安交通大学 | A kind of wind power generating set SCADA data classification method and application based on operating condition |
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| US9407187B2 (en) | 2012-06-28 | 2016-08-02 | General Electric Company | System and method for improving response time of a braking unit |
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| 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 |
| CN110533092A (en) * | 2019-08-23 | 2019-12-03 | 西安交通大学 | A kind of wind power generating set SCADA data classification method and application based on operating condition |
| 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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