CN102646996A - Power control system of double-fed set wind power plant - Google Patents
Power control system of double-fed set wind power plant Download PDFInfo
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- CN102646996A CN102646996A CN2012101372943A CN201210137294A CN102646996A CN 102646996 A CN102646996 A CN 102646996A CN 2012101372943 A CN2012101372943 A CN 2012101372943A CN 201210137294 A CN201210137294 A CN 201210137294A CN 102646996 A CN102646996 A CN 102646996A
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Abstract
The invention discloses a power control system of a double-fed set wind power plant, which comprises a plurality of wind turbine generators, a wind meter, a plurality of analyzing units, a detecting unit and a control unit, wherein the plurality of the analyzing units correspond to the plurality of the wind turbine generators, the detecting unit detects the total output power of the plurality of wind turbine generators, and the control unit can select part of the wind turbine generators to an output enhancing mode according to the total output power detected by the detecting unit. The power control system of the double-fed set wind power plant can achieve optimization of power control of wind generating sets and improves generating efficiency of wind driven generators.
Description
Technical field
The present invention relates to technical field of wind power generation, particularly a kind of power control system of double-fed unit wind energy turbine set.
Background technology
Wind energy resources is a kind of pure green resource, is one of the most ancient on the earth, most important energy.Its huge reserves, renewable, wide, free of contamination characteristic that distributes in the world makes wind power generation become the important directions of world's regenerative resource development.Wind-powered electricity generation is one of minimum reduction of greenhouse gas discharge technology of cost, and there is the demand of huge and sustainable growth the world market for the such zero-discharge technology of wind-powered electricity generation.
In recent years, because control technology and power electronic technology must develop and extensive use, wind generating technology has been obtained significant progress, is that various countries at first consider the new eco-friendly power source that develops.But the randomness of wind energy, gustiness, uncertainty cause frequency, the voltage of the electrical power that the wind-force unit exported all to become with wind speed, must control and adjust the electric energy quality.
Control technology is one of key technology of wind power generation, is " brain " of wind turbine generator, is to make whole unit realize the reliable assurance of normal safety and optimum operation.The research of control technology strengthens the ability to develop independently of Chinese large-sized wind turbine generator, and it is significant with reduction unit cost to improve the wind turbine generator localization rate of parts and components.
In traditional technology, wind turbine generator and wind farm typically are designed to power is delivered to utility system, and this power and system frequency are irrelevant simultaneously.Some wind turbine generators have the variable frequency operation, and need the variable frequency power electronic inverter, wind turbine generator is exported and used the electrical network interface.In a kind of common method, directly wind turbine generator output is fed to the power electronics transducer, therein, with the rectification of turbine frequency and be reverse into the fixed frequency that needs like practical system.A kind of alternative approach is used double-fed asynchronous generator (DFAG), and wherein, the variable frequency power electronic inverter of excitation DFAG rotor winding and stator winding is directly coupled to utility system.
In the conventional electric power system, the frequency of the synchronous generator of electric power system and utility system coupling, the dynamic response of the frequency of utility system relies on the inertia of synchronous generator and load.The synchronous generator that uses in the conventional electric power system can (that is, the catastrophic failure of generating, line out of service or connection heavy load) be contributed the frequency and the voltage control of electric power system during transient behaviour to some extent.During this type of transient behaviour, system frequency begins to change with the speed of mainly being confirmed by the total angular momentum of system, and the total angular momentum of system is all generators and the angular momentum sum that is connected to the rotary load of electric power system.In this type of transient behaviour, synchronous generator can also provide modulation active power with the stable power system and make frequency retrieval arrive the additional control service of its nominal value.
But when being used for electric power system and generating electricity, wind turbine is generally to the not contribution of frequency stabilization of utility system.Along with the electric power that inserts through utility system, generated by wind turbine is bigger, desirable wind turbine also in transient behaviour voltage and the FREQUENCY CONTROL to electric power system contribute to some extent, with the stable power system.
Therefore; Press for the control technology of the above-mentioned restriction that overcomes the wind turbine system; The frequency adjustment and the power hunting that make wind turbine can participate in utility system are more intelligently stablized, thereby can carry out the control of intelligence more to the power of double-fed unit wind energy turbine set.
Summary of the invention
Therefore, the present invention proposes a kind of power control system of double-fed unit wind energy turbine set, can eliminate fully because the restriction of prior art and one or more problems that defective causes.
Additional advantages of the present invention, purpose and characteristic, a part will be illustrated in the specification below, and another part will be tangible for those of ordinary skill in the art through the investigation to following explanation or from enforcement of the present invention, acquire.Structure through in the specification of literal and claims and accompanying drawing, pointing out especially can realize and obtain the object of the invention and advantage.
The invention provides a kind of power control system of double-fed unit wind energy turbine set, said system comprises:
A plurality of wind turbine generators, at least a portion generator have output enhancing ability, and the generator with output enhancing ability can work in normal mode or export enhancement mode;
Anemometer, it is configured to measuring wind information;
A plurality of analytic units; Each analytic unit all is associated with each corresponding said wind turbine generator; Each analytic unit all is configured to analyze the wind speed information of being supplied with by said anemometer, and confirms that the output of their corresponding wind turbine generators strengthens ability;
Detecting unit, it is configured to detect the gross output that is produced by said a plurality of wind turbine generators;
Control unit; It is configured to inquire about each said analytic unit; Strengthen ability with definite output, and select a part of wind turbine generator entering output enhancement mode according to the said gross output of said detection with the corresponding wind turbine generator of each said analytic unit.
According to one preferred embodiment of the present invention, if the gross output that said control unit is confirmed to be detected by said checkout gear less than the level of expecting, just can make selected wind turbine generator improve their power output.
According to one preferred embodiment of the present invention, said system also comprises inversion unit, and said inversion unit links to each other with said control unit, and receives the control of said control unit, through connecting said inverter, can carry out reverse charging to generator through storage battery.
According to one preferred embodiment of the present invention, said control unit adopts single-chip microcomputer and CPLD twin-core chip system.
The power control system of double-fed unit wind energy turbine set provided by the present invention can make to wind turbine generator power control optimization, improves the generating efficiency of wind-driven generator.
Description of drawings
Fig. 1 is the theory diagram according to the power control system of the double-fed unit wind energy turbine set of the embodiment of the invention.
Embodiment
With reference to the accompanying drawings the present invention is more comprehensively described, exemplary embodiment of the present invention wherein is described.
Usually, the disclosure is intended to propose a kind of power control system of double-fed unit wind energy turbine set.The focus of the present invention technology is: when power plant's power of expectation is higher than typically the normal power output by the power plant of wind turbine power curve definitions, and the ability of wind-powered electricity generation factory enhanced power.But, realize that the aspect of this enhancing ability is: have the wind turbine generator (WTG) that can when full control system of power plant is ordered, temporarily strengthen their power.
Persons of ordinary skill in the art will recognize that reduction or limiting the output of total wind-powered electricity generation factory is available ability in the known wind control system.On the other hand, technology of the present invention allows wind-powered electricity generation factory to come to increase at least provisionally its normal output based on the enhancing ability of each turbine.
The wind-powered electricity generation factory power output of expectation is based on multiple factor; These factors can comprise: can be based on the external command of electrical network situation (for example, low frequency signal), satisfy the demand of the power that can guarantee based on some original equipment manufacturer (OEM)s of the full power plant power curve of definition and the available horsepower of the forecast of shortage gradually.
In each of these situation; The control unit system receives (or signal with indication to each WTG) specific " enhancing " pattern situation from each WTG constantly, so that WTG makes response (step 116) with the power bracket that it can provide in this specific enhancement mode.Some wind turbine generators in the wind-powered electricity generation factory can not have the enhancing ability.Usually; Each turbo arrangement becomes to respond this order in the following manner: confirm its available horsepower in " enhancing " and " normally " pattern based on its operating conditions (including but not limited to wind speed, turbine availability etc.), and return response to full control system of power plant.This turbine control can also provide the duration that " enhancing " can be provided.After each WTG received independent enhancement mode ability, the control unit system just can determine intelligently: how to realize power plant's output of expectation at least as much as possible, and adjust independent WTG when needed.Ability based on report; The control unit system can order in the independent turbine some selected outputs that they are independent to be strengthened to: any desired be provided with a little of normal (that is, do not have strengthen) level between ability of their maximum reports and therebetween any desired are provided with a little.According to technology of the present invention, can order with enhancing ability independent one, output smallest number or that all turbines are independent with them be strengthened to independent setting, maybe different being provided with a little, to attempt reaching the wind-powered electricity generation factory output of expectation.
With reference now to Fig. 1,, Fig. 1 is the theory diagram according to the power control system of the double-fed unit wind energy turbine set of the embodiment of the invention.
As shown in Figure 1, the power control system of double-fed unit wind energy turbine set comprises a plurality of wind turbine generators 110,112,114, and at least some of said generator have output enhancing ability, and each generator provides the part output of wind power plant's output; Each generator all comprises analytic unit 120,122,124, and each analytic unit all is associated with corresponding wind turbine generator, and selected analytic unit is configured to analyze the enhancing ability of their corresponding generator output.The output of each is coupled to storage battery 180 through cable or the circuit that is fit in the wind turbine generator 110,112,114.Detecting unit 126 detects the power output that is provided to storage battery 180 by generator, and its discovery is reported to control unit 128.
The power control system of said double-fed unit wind energy turbine set also comprises anemometer 140, and said anemometer adopts pulse signal to represent the rotating speed of generator, and when generator speed was high more, the pulse signal frequency that anemometer is sent was high more.Can anemometer 140 measured wind speed information directly be sent to control unit 128 via communicator, and it be distributed to analytic unit 120,122,124 again via communicator.These analytic units 120,122,124 are configured to analyze the wind speed information of supply and the current enhancing ability and the enhancing ability in the future of definite their corresponding wind turbine generators 110,112,114.Should be appreciated that communicator can be corresponding to any circuit, optical fiber or radio communication device.
In practical operation; Control unit 128 is configured to inquire each in said a plurality of analytic unit; Export enhancing ability with definite with their corresponding wind turbine generators, and order at least one the entering output enhancement mode in the said wind turbine generator.In case thereby said control unit 128 is configured to confirm the gross output that detected by the checkout gear level less than expectation, just can order selected independent wind turbine generator their power output to be risen to the level of the expectation within the corresponding hoisting power that their report intelligently.Can implement the operation adjustment of a plurality of wind turbine generators 110,112,114 via communicator, communicator can be corresponding to any circuit, optical fiber or radio communication device.
Wherein, control unit 128 adopts single-chip microcomputer and CPLD twin-core chip system, and single-chip microcomputer is responsible for data sampling; Algorithm is realized and is shown that CPLD is responsible for logic control, and passes through relay control action output etc.; Both mutual communications realize co-ordination, and wherein single-chip microcomputer also is connected with PORT COM; Be connected with peripheral hardwares such as computers when being used for user's debugger routine, PORT COM adopts modal RS485 and RS212, also is provided with optocoupler between single-chip microcomputer and the PORT COM to be used for Signal Spacing; Single-chip microcomputer can use the most common and lower-cost 8051 series, and for reducing volume, product adopts the C8051F021 paster encapsulation in 8051, and CPLD adopts aboundresources, EPM240 with low cost
Persons of ordinary skill in the art will recognize that there is limit in total enhancing that can provide.Therefore, can also there be limit through the gross power shortage that this characteristic remedies.Also should be borne in mind that will consider when exist strengthening WTG power compromise so that should not be in institute if having time WTG be set to the enhanced power pattern, thereby the energy that maximization is obtained from wind-powered electricity generation factory.
Those of ordinary skills will recognize that also the performance characteristics of these expectations can be depending on a plurality of different aspects that not only comprise technical need but also comprise business demand.Therefore, specific control algolithm can rely on the decision of relevant this type of aspect and change.For example, can be based on average poor or on each instantaneous difference or the given interval based on other parameters, decide the standard in the actual measurement of the difference of the power output of actual power output and expectation.
Be different from conventional power generation usage factory, the wind-powered electricity generation factory of normal operation does not have at mains frequency and plunges and electrical network needs excess power to increase the ability of its power so that mains frequency is returned to its nominal value.Though before through providing the characteristic that can some wind power be remained on " reservation " to solve this shortcoming, the economic impact that the wind-force of leaving during this period runs off is huge, from commercial angle, it is very undesirable making this selection.
The keeping characteristics of before having mentioned provides the very enhancing of short-term, and this is the ability that theme of the present invention can utilize, but technology of the present invention can surmount its current restriction preferably.
The power plant's level power curve that has user expectation to guarantee from original equipment manufacturer.This power curve is represented the total power plant power output based on the measuring wind speed of definition.Be contemplated that this power plant will produce power according to this power curve.Output is not enough to reach this target if control system of power plant detects total power plant, and for example, because some WTG open-circuit lines, technology then of the present invention provides method, and wherein this method can attempt remedying through strengthening other turbines that this is poor.
According to one preferred embodiment of the present invention, the power control system of double-fed unit wind energy turbine set comprises and also comprises inversion unit 150.The pulse signal that is sent by anemometer 140 is through after filter circuit and the comparator; Generate stable generator speed signal, the port input of this tach signal through control unit 128 is when control unit 128 continues 1 minute during greater than 5.12 meter per seconds through calculating wind speed; Control unit 128 sends the instruction of carrying out assistant starting; Through the adhesive of control starting relay, connect the inversion unit of forming by 2,0N6,0S5 150, storage battery is oppositely supplied power to generator; Generator is rotated, and auxiliary generator starts; When control unit 128 continues 1 minute during less than 1 meter per second through calculating wind speed, control unit 128 sends halt instruction, and the control charge relay breaks off, and cuts off charging device to charge in batteries; When control unit 128 detected wind speed greater than 9 meter per seconds through calculating anemometer, control unit 128 sent the brake instruction, the adhesive of control brake relay, brakes on device; Rotation axis to generator brakes, and with the protection generator, breaks off charge relay simultaneously; Preventing that impulse current from producing other elements of control system damages, and when wind speed falls when being back to 5.12～9 meter per seconds, control unit 128 sends restart indication; Break off brake relay, unclamp brake, the charge relay of adhesive simultaneously alternator shaft; Make generator restart to rotate, and begin, when wind speed falls when being back to 1～5.12 meter per second charge in batteries in wind; Control unit 128 sends the instruction of carrying out assistant starting, through the adhesive of control starting relay, connects the inversion unit of being made up of 2,0N6,0S5 150; Storage battery is oppositely supplied power to generator, and generator is rotated, and auxiliary generator starts.
For wind-powered electricity generation factory, the demand that increases gradually below the existence: the forecast of the available horsepower on the recent time range is provided, the for example forecast of average available horsepower on following half an hour or next hour.In this situation, system of the present invention can forecast with the available horsepower that does not have enhancing and to satisfy this demand through providing to have to strengthen, and attempts when needed remedying that this is poor.
The power control system of double-fed unit wind energy turbine set provided by the present invention can make to wind turbine generator power control optimization, improves the generating efficiency of wind-driven generator.
Above content is merely preferred embodiment of the present invention, and for those of ordinary skill in the art, according to thought of the present invention, the part that on embodiment and range of application, all can change, this description should not be construed as limitation of the present invention.
Claims (4)
1. the power control system of a double-fed unit wind energy turbine set is characterized in that, said system comprises:
A plurality of wind turbine generators, at least a portion generator have output enhancing ability, and the generator with output enhancing ability can work in normal mode or export enhancement mode;
Anemometer, it is configured to measuring wind information;
A plurality of analytic units; Each analytic unit all is associated with each corresponding said wind turbine generator; Each analytic unit all is configured to analyze the wind speed information of being supplied with by said anemometer, and confirms that the output of their corresponding wind turbine generators strengthens ability;
Detecting unit, it is configured to detect the gross output that is produced by said a plurality of wind turbine generators;
Control unit; It is configured to inquire about each said analytic unit; Strengthen ability with definite output, and select a part of wind turbine generator entering output enhancement mode according to the said gross output of said detection with the corresponding wind turbine generator of each said analytic unit.
2. the power control system of double-fed unit wind energy turbine set according to claim 1; It is characterized in that; If the gross output that said control unit is confirmed to be detected by said checkout gear less than the level of expecting, just can make selected wind turbine generator improve their power output.
3. the power control system of double-fed unit wind energy turbine set according to claim 1 and 2; It is characterized in that; Said system also comprises inversion unit, and said inversion unit links to each other with said control unit, and receives the control of said control unit; Through connecting said inverter, can carry out reverse charging to generator through storage battery.
4. according to the power control system of any described double-fed unit wind energy turbine set among the claim 1-3, it is characterized in that said control unit adopts single-chip microcomputer and CPLD twin-core chip system.
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| CN2012101372943A CN102646996A (en) | 2012-05-07 | 2012-05-07 | Power control system of double-fed set wind power plant |
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| CN2012101372943A CN102646996A (en) | 2012-05-07 | 2012-05-07 | Power control system of double-fed set wind power plant |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008039119A1 (en) * | 2006-09-29 | 2008-04-03 | Abb Research Ltd. | A control method |
| CN102142711A (en) * | 2011-03-25 | 2011-08-03 | 姚志恩 | Control system of wind driven generator |
| CN102374121A (en) * | 2010-08-05 | 2012-03-14 | 通用电气公司 | Intelligent active power management system for renewable variable power generation |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008039119A1 (en) * | 2006-09-29 | 2008-04-03 | Abb Research Ltd. | A control method |
| CN102374121A (en) * | 2010-08-05 | 2012-03-14 | 通用电气公司 | Intelligent active power management system for renewable variable power generation |
| CN102142711A (en) * | 2011-03-25 | 2011-08-03 | 姚志恩 | Control system of wind driven generator |
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Application publication date: 20120822 |