CN102013762A - Variable speed constant frequency device of wind turbine generator set - Google Patents
Variable speed constant frequency device of wind turbine generator set Download PDFInfo
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- CN102013762A CN102013762A CN2010106025860A CN201010602586A CN102013762A CN 102013762 A CN102013762 A CN 102013762A CN 2010106025860 A CN2010106025860 A CN 2010106025860A CN 201010602586 A CN201010602586 A CN 201010602586A CN 102013762 A CN102013762 A CN 102013762A
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Abstract
The invention relates to a variable speed constant frequency device of a wind turbine generator set, which comprises a planetary gear transmission and a rotational speed regulating device, wherein the planetary gear transmission comprises a sun wheel, a planetary frame and an internal gear ring, the internal gear ring can rotate, three rotating shafts are constituted, and the three shafts can be respectively arbitrarily correspondingly connected with a wind wheel, a generator rotor and the rotational speed regulating device; the rotational speed regulating device adopts an electrical servo system, and the system comprises a torque motor and a frequency converter, a signal processor and a signal sampler thereof; and the torque motor is connected with one rotating shaft of the planetary gear transmission, the signal sampler adopts signals of the wind wheel or a generator, the signal processor is used for carrying out comparison operation with set values, the control signals are outputted to the frequency converter, and the rotational speed of the torque motor is adjusted, thereby leading an output shaft of the planetary gear transmission to achieve the synchronous rotational speed of the generator. The variable speed constant frequency device of the wind turbine generator set is simple in structure, low in cost, stable, reliable, wide in variable speed range and strong in capability of being applicable to a power grid, and has no harmonic pollution to the power grid.
Description
Technical field
The present invention relates to a kind of wind turbine generator of using gear box, particularly relate to a kind of novel variable-speed constant-frequency apparatus of wind turbine generator.
Background technology
Wind turbine generator generally adopts the variable-speed operation mode, and promptly at wind speed hour, the rotating speed of wind wheel is low, when wind speed was high, the rotating speed of wind wheel was also high, can make the tip speed ratio of blade remain at optimum value like this, thereby fullest utilize wind energy, obtain the optimal wind energy utilance, the economy height.To mains supply the time, the power frequency that needs generator to produce is consistent with electrical network.
The technological means that adopts is mainly by following two kinds now:
1. doubly-fed variable-speed constant-frequency technology
Adopt double-fed induction formula generator, generator unit stator is connected with electrical network, and generator amature is connected with electrical network after the frequency conversion of double-fed frequency converter.The excitation frequency of Frequency Converter Control generator makes the mechanical rotation frequency of generator amature add that excitation frequency is consistent with electrical network electricity frequency.Therefore the excitation frequency that can adjust rotor makes generator produce power current under the situation of rotor variable-speed operation.This technology is owing to have only the power of rotor portion to pass through frequency converter, and therefore, the capacity of frequency converter is less.But limited by frequency converter voltage, the slewing range that can realize have only synchronous speed-1/3 ~ 1/3 between.In addition, this technology is to the requirement height of generator, and the rotor of generator needs slip ring, and generator is operated under the inverter supply pattern, the insulation of rotor winding needs special consideration, and rotor will bear high-frequency pulse voltage and high rotating speed, is fit to the also special measure reinforcement of needs of ability of electrical network.
2. total power converter technique
Adopt synchronous generator, be connected operation with electrical network by frequency converter.The rotating speed of generator amature can be realized infinitely variable speeds operation in the scope of broad, the output electric energy of generator becomes the power frequency online after by the total power frequency converter.The advantage of this technology is to realize the variable-speed operation of blower fan in wideer scope, and the energy force rate double-fed transmission technology that adapts to electrical network is strong, and shortcoming is that the transducer power that needs is big, the cost height.
More than two kinds all be by partly using frequency converter to realize constant frequency at motor, even the required frequency inverter capacity of double-fed unit is also very big.And jumbo frequency converter cost height, probability of failure is big, stability, poor reliability.
Have, unit can not use conventional power frequency synchronous generator again, the electric energy poor quality, and harmonic pollution is big, and the ability that adapts to electrical network is not enough.
The open date of publication number CA2670013A1(: patent documentation 20080529) proposes a kind of technical scheme, adopt planetary transmission to carry out stepless speed regulation, can make output speed all reach the synchronous speed of generator at any time by the speed regulator speed governing.
But this speed regulator adopts the fluid power control device, and structure is very complicated, and probability of failure is big, the less reliable of unit operation, also inconvenience is safeguarded, especially, its physical dimension is big, and the volume space of blower housing is limited, bad layout, have to strengthen shell sizes, make blower fan structure tightly not beat, for wind field, each typhoon power generator all disposes a cover hydraulic system, cost is very high, and economy is too poor.
Summary of the invention
The purpose of this invention is to provide a kind of simple in structure, cheap, reliable and stable, slewing range wide, to the electrical network no-harmonic wave pollution, adapt to the strong variable-speed constant-frequency apparatus of wind generator set of electrical network ability.
The technical solution of this programme is:
A kind of variable-speed constant-frequency apparatus of wind turbine generator comprises planetary transmission and speed setting unit; Described planetary transmission comprises sun gear, planet carrier, ring gear, and its ring gear can rotate, and constitutes three rotating shafts, three corresponding arbitrarily respectively wind wheel, generator amature, speed setting units of connecting of axle; Described speed setting unit adopts the electrical servo system, and this system comprises torque motor and frequency converter thereof, signal processor, signal sampler; Described torque motor connects a rotating shaft of planetary transmission, described signal sampler is taked the signal of wind wheel or generator, compare computing by signal processor and set point, to frequency converter output control signal, adjust the rotating speed of torque motor, make the output shaft of planetary transmission reach the generator synchronous speed.
Described signal sampler is taked the tach signal of wind wheel, and the torque motor variable-speed operation makes the output shaft of planetary transmission reach the generator synchronous speed; Torque motor is an induction motor.
Described signal sampler is taked the power signal of generator, and the operation of torque motor constant speed speed makes the output shaft of planetary transmission reach the generator synchronous speed; Torque motor is synchronous motor or induction motor.
Beneficial effect of the present invention
Speed control of the present invention adopts the electrical servo system, and is simple in structure, the reliability height, and with low cost, physical dimension is little, is convenient to installation and maintenance.
Solving wind turbine generator for improving power coefficient, must variable-speed operation, when needing contradiction that constant frequency surfs the Net again
,Adopted three rotatable planetary transmissions of particular design, used the power frequency synchronous generator to be connected, successfully realized the variable speed constant frequency operation with electrical network.This planetary transmission is a kind of mechanical device, is used to control the frequency converter of gear ratio and the torque motor capacity is all very little and for standardized product, so whole system is simple in structure, and is cheap.This device speed adjustable range is wide, and it is strong to adapt to the wind speed ability, and Wind Power Utilization is abundant, and unit is good in economic efficiency; The transmission efficiency height of this device, unit significantly reduces from power consumption.Adopt the wind turbine generator of this device can use the power frequency synchronous generator, no-harmonic wave pollution makes unit can obtain the electric energy quality identical with conventional thermal power generation unit, and the ability that adapts to electrical network is improved, and can save transformer.
Description of drawings
Further specify the present invention below in conjunction with accompanying drawing.
Fig. 1 has represented the wind turbine generator sketch;
Wind turbine generator speed governing FB(flow block) when Fig. 2 has represented a kind of torque motor constant speed;
Wind turbine generator speed governing FB(flow block) when Fig. 3 has represented another kind of torque motor speed change;
Fig. 4 has represented induced moment motor vector control speed regulating control block diagram;
Fig. 5 has represented the block diagram that synchronising torque motor speed adjusting device control system is formed.
Specific embodiments
Among Fig. 1: wind wheel 1 and the interior part of planetary transmission 4(frame of broken lines) connect together, the two ends of planetary transmission 4 connect speed governing brake 5 respectively and high speed output brakes 3.Torque motor 6 is execution units that planetary transmission 4 is carried out speed governing, and torque motor 6 links to each other with planetary transmission 4 by speed governing brake 5.Planetary transmission 4 links to each other with synchronous generator 2 by output brake at a high speed 3.
Characteristics of the present invention are that rotational speed regulation adopts the electrical servo system.There are following two kinds of structures in this system:
Example 1
Among Fig. 2: the part in the frame of broken lines is a speed setting unit, comprises: signal sampler, signal processor, motor frequency conversion device and torque motor.Speed setting unit passes through to regulate the output frequency of frequency converter, and then controls the torque motor that rotating speed changes thereupon, realizes the control to planetary transmission.Wind speed changes moment, and the torque motor rotating speed is constant, so wind speed round is constant, but the variation of input torque causes input of a generator to change.Signal sampler is the power signal input signal processor of generator, signal processor compares power signal and fan parameter information according to control strategy, calculate the occurrence that needs speed governing, output optimized rotating speed control command is given the motor frequency conversion device, torque motor is rotated under Frequency Converter Control, thereby change the gearratio of planetary transmission, wind speed round is changed, fan operation reaches new balance.Finally be implemented under the situation of wind speed variation, the rotating speed of planetary transmission output is always the rated speed of synchronous machine.The torque motor that this kind speed regulating method uses can be a synchronous motor, also can be induction motor.
Example 2
Among Fig. 3: the part in the frame of broken lines is a speed setting unit, comprises: signal sampler, signal processor, motor frequency conversion device and torque motor.Speed setting unit passes through to regulate the output frequency of frequency converter, and then controls the torque motor that rotating speed changes thereupon, realizes the control to planetary transmission.Wind speed changes moment, and the rotating speed of torque motor changes, and the rotation speed change of torque motor causes wind speed round to change.Signal sampler is wind speed round signal input signal processor, signal processor compares tach signal and fan parameter information according to control strategy, calculate the occurrence that needs speed governing, output optimum torque control command is given the motor frequency conversion device, torque motor is rotated under Frequency Converter Control, thereby change the gearratio of planetary transmission, wind speed round is changed, fan operation reaches new balance.Finally be implemented under the situation of wind speed variation, the rotating speed of planetary transmission output is always the rated speed of synchronous machine.The torque motor that this kind speed regulating method uses is induction motor.
In above-mentioned example: if torque motor is an induction motor, can adopt principle of vector control shown in Figure 4, utilize the vector control of slip-frequency control mode can make the induced moment motor obtain high control performance.Advantages such as compare vector control to have a speed adjustable range wide with V/f control, and torque is controlled, and response speed is fast, and acceleration and deceleration characteristic is good.If torque motor is a synchronous motor, can adopt control principle shown in Figure 5, the synchronising torque Motor Control is simple, and efficient still can only be applied under the situation of the permanent rotating speed of torque motor than induction motor height.
Claims (5)
1. the variable-speed constant-frequency apparatus of a wind turbine generator comprises planetary transmission and speed setting unit; Described planetary transmission comprises sun gear, planet carrier, ring gear, and its ring gear can rotate, and constitutes three rotating shafts, three corresponding arbitrarily respectively wind wheel, generator amature, speed setting units of connecting of axle; It is characterized in that: described speed setting unit adopts the electrical servo system, and this system comprises torque motor and frequency converter thereof, signal processor, signal sampler; Described torque motor connects a rotating shaft of planetary transmission, described signal sampler is taked the signal of wind wheel or generator, compare computing by signal processor and set point, to frequency converter output control signal, adjust the rotating speed of torque motor, make the output shaft of planetary transmission reach the generator synchronous speed.
2. the variable-speed constant-frequency apparatus of wind turbine generator according to claim 1, it is characterized in that: described signal sampler is taked the tach signal of wind wheel, and the torque motor variable-speed operation makes the output shaft of planetary transmission reach the generator synchronous speed.
3. the variable-speed constant-frequency apparatus of wind turbine generator according to claim 2, it is characterized in that: described torque motor is an induction motor.
4. the variable-speed constant-frequency apparatus of wind turbine generator according to claim 1, it is characterized in that: described signal sampler is taked the power signal of generator, and the torque motor constant-speed operation makes the output shaft of planetary transmission reach the generator synchronous speed.
5. the variable-speed constant-frequency apparatus of wind turbine generator according to claim 4 is characterized in that, described torque motor is synchronous motor or induction motor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010106025860A CN102013762A (en) | 2010-12-23 | 2010-12-23 | Variable speed constant frequency device of wind turbine generator set |
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| CN2010106025860A CN102013762A (en) | 2010-12-23 | 2010-12-23 | Variable speed constant frequency device of wind turbine generator set |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103064299A (en) * | 2012-12-28 | 2013-04-24 | 东方电气集团东方汽轮机有限公司 | In-the-loop simulation test and control system of wind generating set and test method thereof |
| CN103986278A (en) * | 2013-08-01 | 2014-08-13 | 威海戥同测试设备有限公司 | Different connection motor |
| CN109340341A (en) * | 2018-11-16 | 2019-02-15 | 中国船舶重工集团公司第七0三研究所 | A kind of planetary differential Constant-Speed Unit |
| CN110042791A (en) * | 2019-05-30 | 2019-07-23 | 吉林大学 | A kind of refuse cleaning vehicle energy recycling system and control method |
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|---|---|---|---|---|
| US20020053802A1 (en) * | 2000-11-09 | 2002-05-09 | Tomoaki Makino | Wind driven electrical power generating apparatus |
| CN101001036A (en) * | 2006-12-15 | 2007-07-18 | 天津市新源电气科技有限公司 | Variable-speed constant-frequency wind motor, excitation control system thereof and control method thereof |
| CN101016882A (en) * | 2007-01-05 | 2007-08-15 | 东南大学 | Electric stepless speed change double power flow wind-power generator group |
| CN101344073A (en) * | 2008-07-24 | 2009-01-14 | 东方电气集团东方汽轮机有限公司 | Variable-speed constant-frequency apparatus of wind generator set |
| CN101435413A (en) * | 2008-11-06 | 2009-05-20 | 上海应用技术学院 | Gear drive system for wind power generator |
-
2010
- 2010-12-23 CN CN2010106025860A patent/CN102013762A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020053802A1 (en) * | 2000-11-09 | 2002-05-09 | Tomoaki Makino | Wind driven electrical power generating apparatus |
| CN101001036A (en) * | 2006-12-15 | 2007-07-18 | 天津市新源电气科技有限公司 | Variable-speed constant-frequency wind motor, excitation control system thereof and control method thereof |
| CN101016882A (en) * | 2007-01-05 | 2007-08-15 | 东南大学 | Electric stepless speed change double power flow wind-power generator group |
| CN101344073A (en) * | 2008-07-24 | 2009-01-14 | 东方电气集团东方汽轮机有限公司 | Variable-speed constant-frequency apparatus of wind generator set |
| CN101435413A (en) * | 2008-11-06 | 2009-05-20 | 上海应用技术学院 | Gear drive system for wind power generator |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103064299A (en) * | 2012-12-28 | 2013-04-24 | 东方电气集团东方汽轮机有限公司 | In-the-loop simulation test and control system of wind generating set and test method thereof |
| CN103064299B (en) * | 2012-12-28 | 2016-06-01 | 东方电气风电有限公司 | A kind of wind power generating set assemblage on-orbit TT&C system and testing method thereof |
| CN103986278A (en) * | 2013-08-01 | 2014-08-13 | 威海戥同测试设备有限公司 | Different connection motor |
| WO2015014247A1 (en) * | 2013-08-01 | 2015-02-05 | 威海戥同测试设备有限公司 | Asynchronous connection motor |
| CN109340341A (en) * | 2018-11-16 | 2019-02-15 | 中国船舶重工集团公司第七0三研究所 | A kind of planetary differential Constant-Speed Unit |
| CN110042791A (en) * | 2019-05-30 | 2019-07-23 | 吉林大学 | A kind of refuse cleaning vehicle energy recycling system and control method |
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Application publication date: 20110413 |