CN104819099A - Wind turbine generator set power fluctuation control method and device - Google Patents
Wind turbine generator set power fluctuation control method and device Download PDFInfo
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- CN104819099A CN104819099A CN201510217105.7A CN201510217105A CN104819099A CN 104819099 A CN104819099 A CN 104819099A CN 201510217105 A CN201510217105 A CN 201510217105A CN 104819099 A CN104819099 A CN 104819099A
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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
The invention discloses a wind turbine generator set power fluctuation control method. The wind turbine generator set power fluctuation control method comprises the following steps: 1, the rotation speeds and torque values of generators in a wind turbine generator set are simultaneously measured; 2, actual power values of the generators are calculated according to the obtained rotation speeds and the torque values; 3, variable pitch angles of blades beta are calculated according to the obtained actual power values of the generators and a related power value sum formula: beta=KPe+KI/e, wherein KP represents proportionality coefficient, KI represents integral coefficient, e represents the differences between the actual power values and related power values of the generators, 4, the wind turbine generator set executes variable pitch actions according to the obtained variable pitch angles of the blades beta. The invention further provides a wind turbine generator set power fluctuation control device. The variable pitch angles of the blades beta are calculated by measuring the rotation speeds and torque values of the generators and calculating the related power values of the generators, the output powers of the generators are adjusted by executing blade pitch regulation to enable the powers of the generators to be kept rated, and stable operation of the wind turbine generator set is achieved.
Description
Technical field
The present invention relates to Wind turbines power control techniques field, particularly relate to a kind of power fluctuation of wind generation set controlling method and device.
Background technique
Because abundant wind resource is contained in China, utilizing wind power generating set to generate electricity has become a new direction of new energy development utilization, can create considerable generated energy, solve the electrical problem of each major region of China.Wind turbines is connected to wheel hub primarily of three blades, and wheel hub connects gear-box and generator by lower velocity shaft again, after wind drives blade rotary, drives generator to generate electricity further.
When Wind turbines work runs, convert the kinetic energy in wind to electric energy, and need stable generated output output, to meet the need for electricity of user.But due to wind acting in conjunction by factors such as pressure change, geostrophic deviating force and temperature variation in the process of motion, cause the blade rotary velocity variations of Wind turbines larger, this makes Wind turbines output-power fluctuation when carrying out rated power generating larger, easily cause unit equipment fault, have impact on the power generating quality of Wind turbines and the utilization of wind energy.
As can be seen here, above-mentioned existing Wind turbines, on power swing controls, still has deficiency, how to found a kind of effective power fluctuation of wind generation set controlling method reasonable in design and device, becomes the target that current industry pole need be improved.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of power fluctuation of wind generation set controlling method, effectively can control the power stage of Wind turbines under different wind regime, improve power generation performance and the power generating quality of Wind turbines, thus overcome the deficiency of existing Wind turbines on power swing controls.
For solving the problems of the technologies described above, the invention provides a kind of power fluctuation of wind generation set controlling method, it is characterized in that, described method step is:
(1) measure rotating speed and the torque numerical value of generator in Wind turbines simultaneously;
(2) generator speed obtained according to step (1) and torque numerical value calculate the actual value of generator power under this operating mode;
(3) actual value and the generator rating power value of generator power step (2) obtained do difference, recycling formula:
β＝K
Pe+K
I∫e，
Wherein K
pfor scaling factor, K
ifor the difference that integral coefficient, e are generator power actual value and generator rating power, calculate vane propeller-changing angle beta;
(4) Wind turbines performs according to the vane propeller-changing angle beta that step (3) obtains and becomes oar action.
As a modification of the present invention, adopt the rotating speed of photoelectric encoder to generator to measure in described step (1), adopt the electromagnetic torque of current transformer to generator to measure.
Further improvement, the generator speed signal that described photoelectric encoder records is also by rotating speed filters filter.
Further improvement, the generator electromagnetic torque signal that described current transformer records also is filtered by torque filter.
The technical problem that the present invention also will solve is to provide a kind of power fluctuation of wind generation set control gear that effectively can utilize wind energy, effectively can control the power stage of Wind turbines under different wind regime, improve power generation performance and the power generating quality of Wind turbines, thus overcome the deficiency of existing Wind turbines on power swing controls.
For solving the problems of the technologies described above, the invention provides a kind of power fluctuation of wind generation set control gear, comprise generator speed signals collecting mechanism, generator torque signals collecting mechanism and become oar powered controls, described generator speed signals collecting mechanism and generator torque signals collecting mechanism are connected with the generator of Wind turbines respectively and gather rotating speed and the torque data of described generator, the generator speed collected and torque data are sent to and become oar powered controls, described change oar powered controls are used for calculating and exporting vane propeller-changing angle.
As a modification of the present invention, described generator speed signals collecting mechanism comprises photoelectric encoder and rotating speed wave filter, the input end of described photoelectric encoder is connected with described generator, its output terminal is connected with the input end of rotating speed wave filter, and the output terminal of described rotating speed wave filter is connected with change oar powered controls.
Further improvement, described generator torque signals collecting mechanism comprises current transformer and torque filter, the input end of described current transformer is connected with generator, and its output terminal is connected with the input end of torque filter, and the output terminal of described torque filter is connected with change oar powered controls.
Further improvement, described change oar powered controls comprise power computation module and PI controller, the output terminal of described rotating speed wave filter is all connected with the input end of power computation module with the output terminal of torque filter, the output terminal of described power computation module is connected with PI controller, described power computation module is for calculating and the actual value of output generator power, and described PI controller is used for calculating and exporting vane propeller-changing angle.
Further improvement, described PI controller adopts formula: β=K
pe+K
i∫ e, wherein K
pfor scaling factor, K
ifor the difference that integral coefficient, e are generator power actual value and generator rating power, calculate vane propeller-changing angle beta.
Adopt above-mentioned technological scheme, the present invention at least has the following advantages:
1, power fluctuation of wind generation set controlling method of the present invention is by measuring rotating speed and the torque numerical value of generator, the actual value of calculating generator power, calculate vane propeller-changing angle value further, again by performing vane propeller-changing, generated output power is regulated, generator power is made to maintain on rated power, overcome the problem that wind-driven generator power swing that wind velocity variations causes is larger, achieve the stable operation that wind-driven generator is long-term, significant to the control performance and power generating quality improving Wind turbines.
2, by rotating speed wave filter and torque filter, the tach signal of generator and dtc signal are filtered in the present invention, ensure that stability and the validity of signal.
Accompanying drawing explanation
Above-mentioned is only the general introduction of technical solution of the present invention, and in order to better understand technological means of the present invention, below in conjunction with accompanying drawing and embodiment, the present invention is described in further detail.
Fig. 1 is the structural representation of power fluctuation of wind generation set control gear of the present invention.
Embodiment
The change that Wind turbines is subject to wind speed in the course of the work can cause the fluctuation of generator power, is difficult to the requirement meeting unit allocation performance and power generating quality.The present invention relates to a kind of power fluctuation of wind generation set control gear, the regulable control between power and change oar when unit carries out rated power generating can be realized, overcome wind speed by adjustment change propeller angle and change the power swing caused, ensure that the stable output of Wind turbines is on rated power, meets the requirement of Wind turbines control performance and power generating quality.
With reference to shown in accompanying drawing 1, power fluctuation of wind generation set control gear of the present invention, comprises generator speed signals collecting mechanism, generator torque signals collecting mechanism and becomes oar powered controls.Generator speed signals collecting mechanism and generator torque signals collecting mechanism are connected with the generator of Wind turbines respectively and gather rotating speed and the torque data signal of generator, again the generator speed collected and torque data are sent to and become oar powered controls, become oar powered controls and can calculate vane propeller-changing angle, and export to master control set or the vane change device of Wind turbines, complete to make Wind turbines and become oar action.
Generator speed signals collecting mechanism comprises photoelectric encoder and rotating speed wave filter, and the input end of photoelectric encoder is connected with generator, and for measuring the tach signal of generator, the output terminal of photoelectric encoder is connected with the input end of rotating speed wave filter;
Generator torque signals collecting mechanism comprises current transformer and torque filter, and the input end of current transformer is connected with generator, and for measuring the dtc signal of generator, the output terminal of current transformer is connected with the input end of torque filter;
Become oar powered controls and comprise power computation module and PI controller, the output terminal of rotating speed wave filter is all connected with the input end of power computation module with the output terminal of torque filter, the output terminal of power computation module is connected with PI controller, and the output terminal of PI controller is connected with the master control system of Wind turbines or pitch-controlled system.
Power fluctuation of wind generation set controlling method step of the present invention is as follows:
First, the tach signal of generator in Wind turbines is measured.
The speed revolution value of photoelectric encoder to generator is adopted to measure, its principle is: when generator operation, code-disc in photoelectric encoder and the synchronized rotation of generator, light source in photoelectric encoder is through code-disc and detect grating, its output waveform becomes pulse signal, generator often turns around and namely exports a pulse, after the photoelectricity testing part detection computations pulse signal then in photoelectric encoder, then obtains the speed revolution value of generator through change-over circuit.
The tach signal measured in order to avoid photoelectric encoder is subject to the impact of measurement noises, after photoelectric encoder, rotating speed wave filter is connected in the present embodiment, carry out the filtering of rotating speed frequency tripling noise, erasure signal glitch noise, ensure stability and the validity of signal, then by data conductor, the signal after filtration is sent to power computation module by rotating speed wave filter.
Meanwhile, the electromagnetic torque signal of generator in Wind turbines is measured.
The electromagnetic torque signal of current transformer to generator is adopted to measure, its principle is: current transformer comprises rectification inverter circuit, ac-dc conversion circuit, control trigger circuit and the control circuit of power switch component break-make, wherein rectification inverter circuit is connected with generator amature circuit with the generator unit stator circuit of Wind turbines, can to the magnetic linkage of generator unit stator and rotor circuit, electric current, the numerical value such as voltage carry out measuring and controlling, as used space vector method, current transformer is by detecting the magnetic linkage of generator unit stator and rotor, the numerical value such as electric current and inductance, show that the electromagnetic torque T of generator is:
wherein ψ is stator magnetic linkage size, L
1for rotor mutual inductance numerical value, L
2for stator self inductance numerical value, n is power generator electrode logarithm, and i is rotor current component.
The electromagnetic torque signal measured in order to avoid current transformer is subject to the impact of measurement noises, after current transformer, torque filter is connected in the present embodiment, High frequency filter is carried out to the torque signal collected, it is made to pass through low frequency signal, remove high-frequency noise to the impact of signal, obtain stable generator electromagnetic torque signal, ensure stability and the validity of signal, then by data conductor, the signal after filtration is sent to power computation module by torque filter.
Secondly, draw the actual value of generator power under this wind speed according to generator speed signal obtained above and generator electromagnetic torque calculated signals, then calculate vane propeller-changing angle beta in conjunction with the generator rating power value of setting.
The generator speed signal adopting power computation module record to receive and generator electromagnetic torque signal, and generator speed is multiplied with generator electromagnetic torque, draw the actual value of generator power.Again this generator power numerical value is input to PI controller, the generator power numerical value received compares with the generator rating power value of setting and does difference by PI controller, recycling formula: β=K
pe+K
i∫ e, wherein K
pfor scaling factor, K
ifor the difference that integral coefficient, e are generator power actual value and generator rating power, calculate vane propeller-changing angle beta.
Due to Proportional coefficient K
ppower control actions reaction velocity can be made to accelerate, and steady-state error diminishes, and the number of oscillation of control gear of the present invention is increased; Integral coefficient K
ithe steady-state error of control gear of the present invention can be eliminated, make power control actions reaction velocity slack-off; Differential coefficient can improve this control gear dynamic characteristic, and the variation tendency of reflection deviation signal, carries out drift correction signal, thus reduces regulating time.By considering dynamic performance and the static properties of Wind turbines, the scaling factor of this control gear, integral coefficient and differential system parameter are reasonably set, the vane propeller-changing angle beta that PI controller is exported can take into account the stability and rapidity that become the control of oar power, meets the requirement of control performance.
Finally, Wind turbines performs according to the vane propeller-changing angle β value that PI controller exports and becomes oar action, with the object realizing making the real output of Wind turbines to maintain rated power.
Due to the vane airfoil profile characteristic of Wind turbines, the generated output of Wind turbines can be subject to the impact of vane propeller-changing angle: as larger in vane propeller-changing angle, and the kinetic energy that Wind turbines absorbs from wind is fewer, thus the power being converted to generator is less; Otherwise vane propeller-changing angle is less, the kinetic energy that Wind turbines absorbs from wind is more, and its generated output is larger.When wind speed changes, by adjusting the vane propeller-changing angle of Wind turbines, the object real output of Wind turbines being maintained rated power can be realized, meeting the requirement that power fluctuation of wind generation set controls.
Power fluctuation of wind generation set control gear of the present invention, by adjusting the change propeller angle of turbines vane, regulating generator power, making generator power maintain on rated power, guaranteeing the stable operation of Wind turbines and effective raising of power generating quality.
The above; it is only preferred embodiment of the present invention; not do any pro forma restriction to the present invention, those skilled in the art utilize the technology contents of above-mentioned announcement to make a little simple modification, equivalent variations or modification, all drop in protection scope of the present invention.
Claims (9)
1. a power fluctuation of wind generation set controlling method, is characterized in that, described method step is:
(1) measure rotating speed and the torque numerical value of generator in Wind turbines simultaneously;
(2) generator speed obtained according to step (1) and torque numerical value calculate the actual value of generator power;
(3) actual value and the generator rating power value of generator power step (2) obtained do difference, recycling formula:
β＝K
Pe+K
I∫e，
Wherein K
pfor scaling factor, K
ifor the difference that integral coefficient, e are generator power actual value and generator rating power, calculate vane propeller-changing angle beta;
(4) Wind turbines performs according to the vane propeller-changing angle beta that step (3) obtains and becomes oar action.
2. power fluctuation of wind generation set controlling method according to claim 1, is characterized in that, adopts the rotating speed of photoelectric encoder to generator to measure in described step (1), adopts the electromagnetic torque of current transformer to generator to measure.
3. power fluctuation of wind generation set controlling method according to claim 2, is characterized in that, the generator speed signal that described photoelectric encoder records is also by rotating speed filters filter.
4. power fluctuation of wind generation set controlling method according to claim 2, is characterized in that, the generator electromagnetic torque signal that described current transformer records also is filtered by torque filter.
5. a power fluctuation of wind generation set control gear, it is characterized in that, comprise generator speed signals collecting mechanism, generator torque signals collecting mechanism and become oar powered controls, described generator speed signals collecting mechanism and generator torque signals collecting mechanism are connected with the generator of Wind turbines respectively and gather rotating speed and the torque data of described generator, the generator speed collected and torque data are sent to and become oar powered controls, described change oar powered controls are used for calculating and exporting vane propeller-changing angle.
6. power fluctuation of wind generation set control gear according to claim 5, it is characterized in that, described generator speed signals collecting mechanism comprises photoelectric encoder and rotating speed wave filter, the input end of described photoelectric encoder is connected with described generator, its output terminal is connected with the input end of rotating speed wave filter, and the output terminal of described rotating speed wave filter is connected with change oar powered controls.
7. power fluctuation of wind generation set control gear according to claim 6, it is characterized in that, described generator torque signals collecting mechanism comprises current transformer and torque filter, the input end of described current transformer is connected with generator, its output terminal is connected with the input end of torque filter, and the output terminal of described torque filter is connected with change oar powered controls.
8. power fluctuation of wind generation set control gear according to claim 7, it is characterized in that, described change oar powered controls comprise power computation module and PI controller, the output terminal of described rotating speed wave filter is all connected with the input end of power computation module with the output terminal of torque filter, the output terminal of described power computation module is connected with PI controller, described power computation module is for calculating and the actual value of output generator power, and described PI controller is used for calculating and exporting vane propeller-changing angle.
9. power fluctuation of wind generation set control gear according to claim 8, is characterized in that, described PI controller adopts formula: β=K
pe+K
i∫ e, wherein K
pfor scaling factor, K
ifor the difference that integral coefficient, e are generator power actual value and generator rating power, calculate vane propeller-changing angle beta.
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| CN201510217105.7A CN104819099A (en) | 2015-04-30 | 2015-04-30 | Wind turbine generator set power fluctuation control method and device |
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Cited By (1)
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Application publication date: 20150805 |