CN101109363A - Multilevel variable velocity wind power generator - Google Patents
Multilevel variable velocity wind power generator Download PDFInfo
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- CN101109363A CN101109363A CNA2006100526239A CN200610052623A CN101109363A CN 101109363 A CN101109363 A CN 101109363A CN A2006100526239 A CNA2006100526239 A CN A2006100526239A CN 200610052623 A CN200610052623 A CN 200610052623A CN 101109363 A CN101109363 A CN 101109363A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
Abstract
A wind-driven power generator that can output power with constant frequency with a multi-stages of wind-wheel speed is provided. Wherein, a wind power is accelerated and speed changed by a speed changer; a plurality of output shafts of the speed changer are respectively connected with a plurality of generators; combination of different generators is selected depending upon the wind speed, and corresponding generators are driven to generate power; in the combination, the generators are connected, which can either directly transmit power to a power grid (or other circuit) or transmit power to the rotor winding circuit of a generator of next stage through a control system, so that the frequency of the wind power input the power grid will not only be relative with the mechanical speed of the main shaft of the power generator, but also relative with the input power frequency of the rotor winding of the generator; the electric energy with constant frequency is output with multi-stages of wind-wheel speed by combining the mechanical speed changing of the speed changer with the change in number of pole-pairs of the power generator and by reasonable control, so the utilization of the wind energy and the efficiency of the generator are improved.
Description
The present invention relates to that the FREQUENCY CONTROL of electric energy in the wind-power electricity generation and rotation speed of fan are selected and the rotor speed of the combination of corresponding mechanism, particularly many generators and layout, generator and the electric current of importing the rotor winding to the influence of the electric energy frequency that generator sent etc.
Background technique:
In wind-power electricity generation, general " constant-speed and constant-frequency " and " variable speed constant frequency " the 2 kinds of typical methods that adopt realize the electric energy that output frequency is constant." constant-speed and constant-frequency " refers in the wind-power electricity generation process, keeps draught fan impeller rotating speed and generator shaft rotating speed constant all the time, thereby make wind-driven generator send the constant electric energy of frequency; " variable speed constant frequency " refers to that in the wind-power electricity generation process, the rotating speed of draught fan impeller rotating speed and generator can change with change of wind velocity, and keeps the constant of electric energy frequency directly or indirectly by other controlling methods.
" constant-speed and constant-frequency " wind generating unit cost is low, the technology that is adopted is simple relatively, ripe, but have only when wind speed is a certain particular value, wind energy utilization could be maximum, it is just low more that wind speed departs from this particular value wind energy utilization more, because wind speed is Protean, therefore the total wind energy utilization of " constant-speed and constant-frequency " mode is very low; The characteristics of " variable speed constant frequency " wind generating unit are when wind speed changes, the rotating speed of wind wheel and generator can in very large range change and the electric energy frequency exported remains constant, therefore, in theory no matter in which air speed value, can wind speed round be adjusted to and the corresponding best particular value of this wind speed, thereby maximally utilise wind energy by suitable control, but technical sophistication, cost is higher.
Summary of the invention:
The objective of the invention is to by methods such as motor combination, mechanical speed change, change motor numbers of pole-pairs, wind energy conversion system can be exported the constant frequency electric energy when realizing the wind speed variation under the multistage wind wheel rotating speed, reaches to improve wind energy utilization and purposes such as electric efficiency, reduction gearbox machinery speed increasing ratio.
Accompanying drawing 1 is one of principle schematic of the present invention.
The core institution of the present invention's " multi-change speed " wind generating unit is mainly formed (as shown in Figure 1) by 3 parts: generator 1 and generator 2; Control system; Variable-speed motor.Wherein, the staor winding of high-power generator 2 (being called for short generator 2) is connected with electrical network, is f to the electrical network frequency of delivery
tPower current, and the rotor winding links to each other through the staor winding of control system and small power generator 1 (being called for short generator 1).
Purpose of the present invention is achieved through the following technical solutions: high-power generator 2 is only when wind speed big (the blower fan input power is bigger) just and on the variable-speed motor connection, by variable-speed motor input speed and power and move.Power frequency according to 2 outputs of motor characteristic generator is not only relevant with the mechanical separator speed of rotor, also relevant with the power frequency of input rotor winding, has function with the power frequency " addition " of the mechanical rotation frequency of rotor and rotor winding circuit, electric current after its staor winding output " frequency addition ", these characteristics abbreviate " sum of fundamental frequencies " characteristic as.
Small power generator 1 its rated power is about 1/4 of generator 2 rated power, and its motor number of pole-pairs generally can change.When wind speed hour, variable-speed motor only drives generator 1 work, generator 2 is thrown off and being connected and quitting work of variable-speed motor, the electric current that generator 1 sends switches through control system, directly be passed to electrical network or other circuit, improved generator for electricity generation efficient, prolonged the life-span of high-power generator 2; When wind speed big (the blower fan input power is bigger), 2 generators drive the work of all generating electricity through variable-speed motor, and the electric current that generator 1 sends carries out " sum of fundamental frequencies " through the rotor winding circuit that control system is input to generator 2, in conjunction with methods such as variable-speed motor mechanical speed change, change motor numbers of pole-pairs, make the power frequency of wind generating unit output still keep mains frequency.
Effects such as the parameters such as power frequency that control system mainly plays current switching, changes the motor number of pole-pairs, control generator 1 transfers to generator 2, control generator 2 rotor circuit resistance values.Change the slip of resistance value may command motor, make wind speed and the wind speed round power frequency that generator sends when changing among a small circle still keep constant.
Variable-speed motor is different from the gear speedup case that uses in the traditional wind, it be low speed than gearbox, can speedup again can speed change, can select output speed according to the wind speed size, and gear rotational speed is lower, has reduced lubricating requirement, has reduced maintenance cost.
According to " sum of fundamental frequencies " characteristic, in two motor combination generatings of Fig. 1, the power frequency f of generator 2 staor winding output
t, generator 1 staor winding output power frequency f
1(f
1=P
1* f
N1) and the mechanical rotation frequency of rotor should meet following relation:
f
t=P
2* f
N2+ P
1* f
N1(formula-1)
Wherein, f
tFor the power frequency of generator 2 staor winding output, identical with mains frequency;
P
2Number of pole-pairs for generator 2;
f
N2Rotor mechanical speed for generator 2;
P
1Number of pole-pairs for generator 1;
f
N1Rotor mechanical speed for generator 1.
As long as design, the P that controls well
1, f
N1, P
2, f
N2These four parameters can make the power frequency of generator 2 outputs remain mains frequency or other required frequencies fully, and these four parameters are mainly realized by variable-speed motor mechanical speed change and change power generator electrode logarithm.Therefore, utilize generator 2 " sum of fundamental frequencies " characteristic, by variable-speed motor mechanical speed change and change power generator electrode logarithm, wind energy conversion system can be exported the electric energy of constant frequency in the time of can realizing the wind speed variation under the multistage wind wheel rotating speed, to improve utilization ratio of wind energy.
Known by formula 1, increase the motor number of pole-pairs, can reduce mechanical frequency, corresponding reduction rotor and gear rotational speed improve lubricating condition, reduce maintenance cost.
What Fig. 1 illustrated is the working principle that 2 generators make up generating and " sum of fundamental frequencies ", can increase the generator quantity of combination according to actual needs with installation conditions.Fig. 2 is the principle schematic that many generators make up generating, by " sum of fundamental frequencies " characteristic as can be known, the many more electric energy frequencies of finally sending of " sum of fundamental frequencies " motor progression can be big more under other condition same cases, or be interpreted as the electric energy that will obtain same frequency, " sum of fundamental frequencies " motor progression speed increasing ratio of variable-speed motor more at most can correspondingly reduce, so just reduced the cost of variable-speed motor, even can save speed increaser and realize that blower fan directly drives generator.
" sum of fundamental frequencies " characteristic can also be used for the separately wind mill group of generating, and Fig. 3 is that electric energy that many wind energy conversion systems send carries out the schematic representation of " sum of fundamental frequencies ".As shown in Figure 3, although the electric energy frequency that the separate unit wind energy conversion system is sent may not meet the requirements of frequency values, through appropriate " sum of fundamental frequencies " the final exportable electric energy that meets frequency requirement.
By above explanation as can be known, " multi-change speed " wind generating unit has following outstanding characteristics:
1, compare with " constant-speed and constant-frequency " wind generating unit, the wind energy utilization of " multi-change speed " wind generating unit significantly improves.
2, compare with " variable speed constant frequency " wind generating unit, " multi-change speed " wind generating unit is practical more economically, and technology is suitable for more simple and reliable.
3, owing to adopted " sum of fundamental frequencies " technology and " many generators " generating, reduce the mechanical speed increasing ratio of wind energy conversion system, improved the reliability and the Economy of machine driven system; Under different wind speed, can carry out the generating combination of different generators, there is not " heavy-duty motor is sent out low-power energy " phenomenon, improved the efficient and the utilization ratio of generator.
Claims (2)
1. the wind-driven generator before the present invention generally is that power only drives a generator for electricity generation after the booster engine speedup, or booster engine has many generators, but each generator is independent of each other.
The core institution of the present invention's " multi-change speed " wind generating unit mainly is made up of 3 parts such as variable-speed motor, many generators, control system, wind-force converts rotating power to by wind wheel, through variable-speed motor speedup and speed change, variable-speed motor is connected with the Duo Tai generator, drives corresponding generator for electricity generation as required.
Its feature 1 be each generator not only can be directly to electrical network (or other circuit) transmission of electricity but also can be through the rotor winding circuit transmission of electricity of control system control to the next stage generator, the power frequency of input subordinate generator amature winding and the mechanical rotation frequency of generator shaft are carried out " sum of fundamental frequencies ", thereby influence the frequency of generator output, the electric energy frequency of the final output of generator can be big more more at most to carry out the motor of " sum of fundamental frequencies " combination.
Its feature 2 is that its variable-speed motor decapacitation machinery speedup also has speed changing function outward, variable-speed motor can change speed increasing ratio and drive corresponding generator work as required, number of pole-pairs in conjunction with generator changes and " sum of fundamental frequencies " characteristic, reaches the electric energy that output meets frequency requirement.
2. the wind-driven generator before the present invention is generally all imported electrical network (or other circuit) separately, is independent of each other.
The present invention's " multi-change speed " wind generating unit can make several wind energy conversion systems that generate electricity separately utilize " sum of fundamental frequencies " property combination of motor, reaches the purpose that reduces mechanical speed increasing ratio or improve the electric energy frequency.
It is characterized in that making up each wind energy conversion system in the wind mill group of generating not only can be directly to electrical network (or other circuit) transmission of electricity but also can carry out " sum of fundamental frequencies " through the rotor winding circuit transmission of electricity that control system is controlled downward one-level wind energy conversion system, the electric energy frequency of the final output of wind energy conversion system can be big more more at most to carry out the wind energy conversion system of " sum of fundamental frequencies " combination.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006100526239A CN101109363A (en) | 2006-07-22 | 2006-07-22 | Multilevel variable velocity wind power generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006100526239A CN101109363A (en) | 2006-07-22 | 2006-07-22 | Multilevel variable velocity wind power generator |
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| Publication Number | Publication Date |
|---|---|
| CN101109363A true CN101109363A (en) | 2008-01-23 |
Family
ID=39041571
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2006100526239A Pending CN101109363A (en) | 2006-07-22 | 2006-07-22 | Multilevel variable velocity wind power generator |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102105682A (en) * | 2008-07-22 | 2011-06-22 | 维斯塔斯风力系统集团公司 | Method of controlling a variable speed wind turbine generator |
| CN105041575A (en) * | 2015-07-10 | 2015-11-11 | 三一重型能源装备有限公司 | Multi-motor power generation device and wind power generation unit |
-
2006
- 2006-07-22 CN CNA2006100526239A patent/CN101109363A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102105682A (en) * | 2008-07-22 | 2011-06-22 | 维斯塔斯风力系统集团公司 | Method of controlling a variable speed wind turbine generator |
| CN102105682B (en) * | 2008-07-22 | 2015-08-05 | 维斯塔斯风力系统集团公司 | Control the method for variable speed wind turbine generator |
| CN105041575A (en) * | 2015-07-10 | 2015-11-11 | 三一重型能源装备有限公司 | Multi-motor power generation device and wind power generation unit |
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