CN103244349B - Fan tower vibration suppression system and control system for improving fan cut-out wind speed - Google Patents

Abstract

The invention provides a vibration suppression system for a fan tower and a control system for improving the cut-out wind speed of a fan. In the invention, the vibration acceleration in the direction vertical to the windward direction of the impeller is introduced into the generator rotating speed-electromagnetic torque closed-loop control circuit to inhibit the vibration in the direction vertical to the windward direction of the impeller; introducing a vibration acceleration signal of the impeller in the windward direction into a generator rotating speed-variable pitch rate closed-loop control circuit to inhibit the vibration of the impeller in the windward direction; and adjusting the given value of the rotating speed of the generator according to the wind speed measuring signal, and keeping the rated torque of the generator unchanged, so that the output power of the fan under the condition of strong wind is adjusted, and the aim of improving the cut-out wind speed of the fan is fulfilled.

Description

The control system of blower fan pylon Vibration Suppression System and raising blower fan cut-out wind speed

Technical field

The invention belongs to wind power generation field, relate to a kind of blower fan pylon Vibration Suppression System and a kind of control system improving blower fan cut-out wind speed.

Background technique

Wind-driven generator (Wind Turbine, MT, be called for short blower fan) operationally, may cause blower fan pylon (also referred to as tower cylinder) with impeller (the Side-side direction, direction that direction is vertical windward, also be just vertical with wind direction direction) produce the larger first natural frequency vibration of Amplitude Ratio, and may cause blower fan pylon impeller windward direction (Fore-aft direction is also wind direction) produce Amplitude Ratio larger first natural frequency vibration.

Particularly, for pylon Side-side direction, blower fan, when following stage running, can cause producing the larger first natural frequency vibration of Amplitude Ratio in set tower frame Side-side direction:

(1.1) near incision wind speed, unit be in the pattern of generating electricity by way of merging two or more grid systems and generator speed close under minimum grid-connected speed conditions, because the first natural frequency in pylon Side-side direction and 3 frequencys multiplication of generator speed are coupled, cause occurring at pylon Side-side direction single order vibration fault;

(1.2) close under cut-out wind speed stage unit starting process to the pattern of generating electricity by way of merging two or more grid systems, owing to limiting by wind regime, unit is held near minimum grid-connected rotating speed at longer time dimension, be because the first natural frequency in pylon Side-side direction and 3 frequencys multiplication of generator speed are coupled equally, cause occurring at pylon Side-side direction single order vibration fault;

(1.3) near rated wind speed and wind speed is steady, when turbulence intensity is little, for blower fan, because the pneumatic damping of the first natural frequency in pylon Side-side direction itself is smaller, if do not take the measure that the first natural frequency in any suppression pylon Side-side direction is vibrated, first the signal with the first natural frequency same frequency in pylon Side-side direction can be motivated in generator speed signal, this frequency signal can correspondingly appear in generator electromagnetic torque control, consequently, the pneumatic damping of the first natural frequency in pylon Side-side direction reduces further, the single order vibration fault in pylon Side-side direction is finally caused to occur,

(1.4) for the storm wind control strategy scheme improving unit cut-out wind speed, when the cut-out wind speed numerical value of fan operation wind speed higher than routine, the first natural frequency vibration fault in pylon Side-side direction is easily caused to occur.

In order to avoid generating electricity by way of merging two or more grid systems the operation phase with suppression blower fan, the first natural frequency vibration fault in pylon Side-side direction occurs, a series connection bandstop filter in generator speed-electromagnetic torque control loop at present, this bandstop filter is mainly used in the signal intensity with the first natural frequency same frequency in pylon Side-side direction in decay generator speed signal, therefore would not comprise the fluctuating torque action of the first natural frequency pneumatic damping reducing pylon Side-side direction in generator electromagnetic torque control command again.Electromagnetic torque control can not again Active spurring pylon Side-side direction first natural frequency vibration.

In generator speed-electromagnetic torque control loop, increase the technological scheme of bandstop filter, its shortcoming is mainly manifested in following four aspects:

(1.5) program can only for fan operation in the stage of generating electricity by way of merging two or more grid systems, the vibration caused by first natural frequency same frequency signal simultaneously comprising pylon Side-side direction in generator speed signal plays inhibitory action, and for fan operation under close to cut-out wind speed condition in start-up course, or fan operation wind speed higher than conventional cut-out wind speed storm wind control the stage time, but do not comprise the vibration caused by first natural frequency same frequency signal in pylon Side-side direction in generator speed signal (namely, situation (1.2) mentioned above and (1.4)) be helpless.

(1.6) for generator speed-electromagnetic torque close loop control circuit, system response time is slow, overshoot is large, poor dynamic.

(1.7) due to the performance of blower fan in generator speed-electromagnetic torque control loop dynamic response need be taken into account, therefore bandstop filter can not be too large in the selection of trap amplitude, and this causes at the be incorporated into the power networks vibration acceleration in stage pylon Side-side direction of blower fan still larger.

(1.8) fatigue load of the moment M x in pylon Side-side direction is larger.

In addition, for pylon Fore-aft direction, blower fan, when following stage running, can cause producing the larger first natural frequency vibration of Amplitude Ratio in set tower frame Fore-aft direction:

(2.1) near incision wind speed, unit be in the pattern of generating electricity by way of merging two or more grid systems and generator speed close under minimum grid-connected speed conditions, because the first natural frequency in pylon Fore-aft direction and 3 frequencys multiplication of generator speed are coupled, the single order vibration fault in pylon Fore-aft direction is caused to occur;

(2.2) close under cut-out wind speed stage unit starting process to the pattern of generating electricity by way of merging two or more grid systems, owing to limiting by wind regime, unit is held near minimum grid-connected rotating speed at longer time dimension, be because the first natural frequency in pylon Fore-aft direction and 3 frequencys multiplication of generator speed are coupled equally, cause the single order vibration fault in pylon Fore-aft direction to occur;

(2.3) more than rated wind speed, for blower fan, because the pneumatic damping of the first natural frequency in pylon Fore-aft direction itself is smaller, if do not take the measure that the first natural frequency in any suppression pylon Fore-aft direction is vibrated, in unit Operation at full power process, first the signal with the first natural frequency same frequency in pylon Fore-aft direction can be motivated in generator speed signal, this frequency signal can be amplified in execution change oar course of action further by Bian Jiang actuator, correspondingly, the pneumatic damping of the first natural frequency in pylon Fore-aft direction becomes less, the single order vibration fault in pylon Fore-aft direction is caused to occur,

(2.4) unit operation is more than rated wind speed, owing to being subject to, compared with strong gusts of wind and the impact becoming oar action fast, causing the first natural frequency vibration fault in pylon Fore-aft direction to occur;

(2.5) unit operation is near rated wind speed or more than rated wind speed, due to electrical network, full power convertor or generator failure, cause generator side air-break switch to trip, now can produce larger first natural frequency vibration in pylon Fore-aft direction equally;

(2.6) for the storm wind control strategy scheme improving unit cut-out wind speed, when the cut-out wind speed numerical value of fan operation wind speed higher than routine, the first natural frequency vibration fault in pylon Fore-aft direction is easily caused to occur.

In order to avoid with suppression blower fan in the rated wind speed above operation phase, the first natural frequency vibration fault in pylon Fore-aft direction occurs, a series connection bandstop filter in generator speed-change oar control loop at present, this bandstop filter is mainly used in the signal intensity with the first natural frequency same frequency in pylon Fore-aft direction in decay generator speed signal, is therefore becoming the change oar action that would not comprise the first natural frequency pneumatic damping reducing pylon Fore-aft direction in oar control command again.Become oar control can not again Active spurring pylon Fore-aft direction first natural frequency vibration.

In generator speed-change oar control loop, increase the technological scheme of bandstop filter, its shortcoming is mainly manifested in following three aspects:

(2.7) program can only for fan operation more than rated wind speed, the vibration caused by first natural frequency same frequency signal simultaneously comprising pylon Fore-aft direction in generator speed signal plays inhibitory action, and for fan operation below rated wind speed, or fan operation is more than rated wind speed, but the vibration (that is, situation (2.1) mentioned before, (2.2), (2.4), (2.5) and (2.6)) caused by first natural frequency same frequency signal not comprising pylon Fore-aft direction in generator speed signal is helpless.

(2.8) for generator speed-change oar close loop control circuit, system response time is slow, overshoot is large, poor dynamic.

(2.9) the generator side air-break switch trip behavior that the situation (2.5) before is mentioned, for determining that the mechanical part limit load such as axial fan hub, driftage bearing, pylon, basis plays a decisive role, owing to increasing the technological scheme of bandstop filter to causing the helpless of this kind of vibration in generator speed-change oar control loop, therefore the mechanical part limit load such as axial fan hub, driftage bearing, pylon, basis is comparatively large, and the cost of whole blower fan is higher.

In addition; the blower fan of different type of machines; for mean wind velocity, Limit of Wind Speed, the essential information such as wind frequency division cloth and turbulence intensity of a certain specific wind energy turbine set, all can design and specify corresponding cut-out wind speed, to guarantee unit safe operation within the projected life of about 20 years.When actual wind speed exceedes cut-out wind speed, unit will perform shutdown action, until actual wind speed is lower than cut-out wind speed, unit just can restart and generate electricity by way of merging two or more grid systems.For some wind energy turbine set, wind speed is long higher than the time of cut-out wind speed, and therefore wind energy turbine set developer proposes under the prerequisite ensureing unit safety, is promoted unit generated energy by the cut-out wind speed improving blower fan, is improved the demand of wind energy turbine set investment return.

The function improving unit cut-out wind speed is not comprised in the control strategy that blower fan is current.A series connection bandstop filter in generator speed-change oar rate control loop at present, this bandstop filter is mainly used in decay generator speed signal, with the signal intensity of pylon Fore-aft direction first natural frequency same frequency, a series connection bandstop filter in generator speed-electromagnetic torque control loop simultaneously, this bandstop filter is mainly used in decay generator speed signal, with the signal intensity of pylon Side-side direction first natural frequency same frequency, blower fan is suppressed to occur in rated wind speed above pylon Fore-aft direction and the operation phase Side-side direction first natural frequency vibration fault that generates electricity by way of merging two or more grid systems respectively with this.

Because existing blower fan does not comprise the function improving unit cut-out wind speed, therefore cannot promote unit generated energy by improving cut-out wind speed and improve wind energy turbine set investment return.

For the generator speed-change oar rate control loop of series bandstop filter and generator speed-electromagnetic torque control loop, after improving the cut-out wind speed of unit operation, under fan starting process and pattern of generating electricity by way of merging two or more grid systems, the Oscillation Amplitude of the first natural frequency in set tower frame Fore-aft direction and Side-side direction all can increase considerably, unit can be caused on the one hand to produce Fore-aft direction or Side-side direction vibration fault, pylon My moment of flexure and Mx moment of flexure make corresponding fatigue load increase considerably because Oscillation Amplitude increases equally on the other hand.

Summary of the invention

The object of the invention is to reduce blower fan when running under the pattern of generating electricity by way of merging two or more grid systems, the amplitude of pylon Side-side direction first natural frequency vibration, reduce the generation of corresponding vibration fault in unit running process, reduce the fatigue load of pylon Side-side direction moment M x simultaneously; Promote the dynamic characteristic of generator speed-electromagnetic torque closed loop control, comprise and reduce overshoot, shortening response time etc.

The present invention also aims to make blower fan in wider wind speed, wider rotating speed, wider range of operation, reduce the amplitude of blower fan pylon Fore-aft direction first natural frequency vibration, reduce the generation of corresponding vibration fault in unit running process; Promote the dynamic characteristic of generator speed-change oar speed closed loop control, comprise and reduce overshoot, shortening response time etc.; Under generator side air-break switch trip behavior, by reducing the amplitude of blower fan pylon Fore-aft direction first natural frequency vibration, reducing the mechanical part limit load such as axial fan hub, driftage bearing, pylon, basis, thus reducing the cost of whole blower fan.

The present invention also aims to, under the prerequisite ensureing fan safe, improve the numerical value of unit cut-out wind speed, promote unit generated energy with this and improve wind energy turbine set investment return; After significantly reducing unit raising cut-out wind speed, Fore-aft direction and Side-side direction first natural frequency Oscillation Amplitude under start-up course and pattern of generating electricity by way of merging two or more grid systems, ensure unit smooth running and reduce pylon My moment of flexure, Mx moment of flexure fatigue load.

According to an aspect of the present invention, that there is provided a kind of blower fan pylon with Vibration Suppression System that the is impeller direction that direction is vertical windward, described Vibration Suppression System comprises: generator speed measurement module, is arranged in fan engine room, measure generator speed, to obtain generator speed measured value; Comparator, compares generator speed measured value and generator speed setting value; Proportional plus integral controller, receives the comparative result of comparator, carries out proportional integral computing, obtain the first control inputs value of generator electromagnetic torque to described comparative result; Acceleration analysis module, is arranged in fan engine room, that measure pylon with vibration acceleration that the is impeller direction that direction is vertical windward; Integration module, receives the vibration acceleration that acceleration analysis module is measured, carries out integral operation to described vibration acceleration; Band-pass filter, carries out bandpass filtering to the integral operation result of integration module, extracts first natural frequency signal from pylon with the vibration acceleration in the impeller direction that direction is vertical windward; Proportional gain module, carries out proportional gain amplification to the bandpass filtering result of band-pass filter, obtains the second control inputs value of generator electromagnetic torque; Adder, first control inputs value of generator electromagnetic torque and the second control inputs value of generator electromagnetic torque are superposed, obtain generator electromagnetic torque setting value, described generator electromagnetic torque setting value for controlling the electromagnetic torque of blower fan, thus reduce pylon with the first natural frequency Oscillation Amplitude in the impeller direction that direction is vertical windward.

Described Vibration Suppression System also comprises: the first low-pass filter, be connected between generator speed measurement module and comparator, lower pass-filter is carried out to generator speed measured value, the result of lower pass-filter is supplied to comparator, to compare with generator speed setting value.

Described Vibration Suppression System also comprises: the second low-pass filter, be connected between proportional plus integral controller and adder, the proportional integral result of comparative example integral controller carries out lower pass-filter, the result of lower pass-filter is supplied to the first control inputs value of adder as generator electromagnetic torque.

According to a further aspect in the invention, the Vibration Suppression System in the impeller that a kind of blower fan pylon is provided direction windward, described Vibration Suppression System comprises: generator speed measurement module, is arranged in fan engine room, measure generator speed, to obtain generator speed measured value; Comparator, compares generator speed measured value and generator speed setting value; Proportional plus derivative controller, receives the comparative result of comparator, carries out proportion differential computing to described comparative result, obtains the first control inputs value that fan blade becomes oar speed; Acceleration analysis module, is arranged in fan engine room, measures the vibration acceleration in the impeller direction windward of pylon; Band-pass filter, receives the vibration acceleration that acceleration analysis module is measured, carries out bandpass filtering to described vibration acceleration, from the vibration acceleration in the impeller of pylon direction windward, extract first natural frequency signal; Second order filter, carries out second-order filter to the bandpass filtering result of band-pass filter; Proportional gain module, carries out proportional gain amplification to the second-order filter result of second order filter, obtains the second control inputs value that fan blade becomes oar speed; Adder, second control inputs value of the first control inputs value and fan blade change oar speed that fan blade are become oar speed superposes, obtain fan blade and become oar speed setting value, described fan blade becomes oar speed setting value for controlling the change oar speed of blower fan, thus the first natural frequency Oscillation Amplitude in the impeller reducing pylon direction windward.

Described Vibration Suppression System also comprises: the first low-pass filter, be connected between generator speed measurement module and comparator, lower pass-filter is carried out to generator speed measured value, the result of lower pass-filter is supplied to comparator, to compare with generator speed setting value.

Described Vibration Suppression System also comprises: the second low-pass filter, be connected between proportional plus derivative controller and adder, the proportion differential result of comparative example derivative controller carries out lower pass-filter, the result of lower pass-filter is supplied to adder becomes oar speed the first control inputs value as fan blade.

According to a further aspect in the invention, provide a kind of and improve blower fan cut-out wind speed and the control system of suppression vibration, described control system comprises: measuring wind speed module, is arranged on fan engine room, for measuring wind farm wind velocity; First low-pass filter, carries out lower pass-filter to the wind speed that measuring wind speed module is measured; Wind speed-generator rated speed conversion module, receives the result of lower pass-filter, converses generator rated speed from the first low-pass filter; Second low-pass filter, carries out lower pass-filter to the generator rated speed that wind speed-generator rated speed conversion module converses, obtains described generator speed setting value; Generator speed measurement module, is arranged in fan engine room, measures generator speed, to obtain generator speed measured value; First comparator, compares generator speed measured value and generator speed setting value; Proportional plus integral controller, receives the comparative result of the first comparator, carries out proportional integral computing to described comparative result, obtains the first control inputs value of generator electromagnetic torque; Acceleration analysis module, is arranged in fan engine room, that measure pylon with vibration acceleration that the is impeller impeller direction windward of the vibration acceleration in the direction that direction is vertical and pylon windward; Integration module, that receive the pylon that acceleration analysis module measures with vibration acceleration that the is impeller direction that direction is vertical windward, integral operation is carried out to described vibration acceleration; First band-pass filter, carries out bandpass filtering to the integral operation result of integration module, extracts first natural frequency signal from pylon with the vibration acceleration in the impeller direction that direction is vertical windward; First proportional gain module, carries out proportional gain amplification to the bandpass filtering result of the first band-pass filter, obtains the second control inputs value of generator electromagnetic torque; First adder, first control inputs value of generator electromagnetic torque and the second control inputs value of generator electromagnetic torque are superposed, obtain generator electromagnetic torque setting value, described generator electromagnetic torque setting value for controlling the electromagnetic torque of blower fan, thus reduce pylon with the first natural frequency Oscillation Amplitude in the impeller direction that direction is vertical windward; Second comparator, compares generator speed measured value and generator speed setting value; Proportional plus derivative controller, receives the comparative result of the second comparator, carries out proportion differential computing to described comparative result, obtains the first control inputs value that fan blade becomes oar speed; Second band-pass filter, the vibration acceleration in the impeller receiving the pylon that acceleration analysis module is measured direction windward, carries out bandpass filtering to described vibration acceleration, from the vibration acceleration in the impeller of pylon direction windward, extract first natural frequency signal; Second order filter, carries out second-order filter to the bandpass filtering result of the second band-pass filter; Second proportional gain module, carries out proportional gain amplification to the second-order filter result of second order filter, obtains the second control inputs value that fan blade becomes oar speed; Second adder, second control inputs value of the first control inputs value and fan blade change oar speed that fan blade are become oar speed superposes, obtain fan blade and become oar speed setting value, described fan blade becomes oar speed setting value for controlling the change oar speed of blower fan, thus the first natural frequency Oscillation Amplitude in the impeller reducing pylon direction windward.

Described Vibration Suppression System also comprises: the 3rd low-pass filter, be connected between generator speed measurement module and the first comparator, lower pass-filter is carried out to generator speed measured value, the result of lower pass-filter is supplied to the first comparator, to compare with generator speed setting value.

Described Vibration Suppression System also comprises: the 4th low-pass filter, be connected between proportional plus integral controller and first adder, the proportional integral result of comparative example integral controller carries out lower pass-filter, the result of lower pass-filter is supplied to the first control inputs value of first adder as generator electromagnetic torque.

Described Vibration Suppression System also comprises: the 5th low-pass filter, be connected between generator speed measurement module and the second comparator, lower pass-filter is carried out to generator speed measured value, the result of lower pass-filter is supplied to the second comparator, to compare with generator speed setting value.

Described Vibration Suppression System also comprises: the 6th low-pass filter, be connected between proportional plus derivative controller and second adder, the proportion differential result of comparative example derivative controller carries out lower pass-filter, the result of lower pass-filter is supplied to second adder becomes oar speed the first control inputs value as fan blade.

When wind farm wind velocity controls initial wind speed lower than storm wind, blower fan output power is the rated power of blower fan; When wind farm wind velocity controls between initial wind speed and blower fan cut-out wind speed at storm wind, the specified electromagnetic torque of generator remains unchanged, and the output power of blower fan reduces along with generator speed setting value and reduces; When wind farm wind velocity is higher than blower fan cut-out wind speed, blower fan is out of service, and output power is zero.

When wind speed exceedes the design cut-out wind speed of blower fan, reduce the rated speed of generator, improve blower fan cut-out wind speed thus.

Accompanying drawing explanation

By the description carried out embodiment below in conjunction with accompanying drawing, these and/or other aspect of the present invention and advantage will become clear and be easier to understand, wherein:

Fig. 1 is the block diagram of the blower fan pylon Side-side direction Vibration Suppression System illustrated according to a first embodiment of the present invention;

Fig. 2 shows the Open loop step response of wind speed-Side-side direction, cabin speed;

Fig. 3 shows the Open loop step response of generator electromagnetic torque-Side-side direction, cabin speed;

Fig. 4 shows the open loop bode(Byrd of generator electromagnetic torque-Side-side direction, cabin speed) figure;

Fig. 5 and Fig. 6 respectively illustrates the closed loop step response of technological scheme and the Side-side direction vibration suppression technological scheme introducing bandstop filter in generator speed-electromagnetic torque control loop, the overshoot of obvious Side-side direction vibration suppression technological scheme is lower, and regulating time is shorter.

Fig. 7 and Fig. 8 respectively illustrates the closed loop bode figure of technological scheme and the Side-side direction vibration suppression technological scheme introducing bandstop filter in generator speed-electromagnetic torque control loop;

Fig. 9, Figure 10 and Figure 11 respectively illustrate the technological scheme and Side-side direction vibration suppression technological scheme of introducing bandstop filter in generator speed-electromagnetic torque control loop, emulate Side-side direction vibration acceleration in fan starting process, pylon bottom moment Mx load, blade angle variation tendency under high wind conditions;

Figure 12, Figure 13 and Figure 14 respectively illustrate the technological scheme and Side-side direction vibration suppression technological scheme of introducing bandstop filter in generator speed-electromagnetic torque control loop, in raising strong wind cut-out wind speed situation, emulate Side-side direction vibration acceleration in fan operation process, pylon bottom moment Mx load, blower fan output power variation tendency;

Figure 15 is the block diagram of the blower fan pylon Fore-aft direction Vibration Suppression System illustrated according to a second embodiment of the present invention;

Figure 16 represents that becoming oar speed-cabin Speed open-loop control bode schemes;

Fore-aft direction Vibration Suppression System generator speed-change oar speed closed loop bode that Figure 17 and Figure 18 represents an introducing band-pass filter respectively and introduce band-pass filter and second order filter simultaneously schemes;

The change that the yield value K that Figure 19 shows proportional gain module changes with angle of fan leaves;

Figure 20 shows the Open loop step response of wind speed-cabin speed;

Figure 21 shows the Open loop step response of generator electromagnetic torque-cabin speed;

Figure 22 and Figure 23 respectively illustrates and introduce the technological scheme of bandstop filter and the closed loop step response of Fore-aft direction vibration suppression technological scheme in generator speed-change oar rate control loop;

Figure 24 and Figure 25 respectively illustrates the closed loop bode figure of technological scheme and the Fore-aft direction vibration suppression technological scheme introducing bandstop filter in generator speed-change oar rate control loop;

Figure 26, Figure 27 and Figure 28 respectively illustrate the technological scheme and Fore-aft direction vibration suppression technological scheme of introducing bandstop filter in generator speed-change oar rate control loop, emulate fan starting process Leaf angle, Fore-aft direction vibration acceleration, pylon bottom moment My load change trend under high wind conditions;

Figure 29 and Figure 30 respectively illustrates the technological scheme and Fore-aft direction vibration suppression technological scheme of introducing bandstop filter in generator speed-change oar rate control loop, emulates fan operation process Leaf angle, Fore-aft direction vibration acceleration variation tendency under little landscape condition;

Figure 31 and Figure 32 respectively illustrates the technological scheme and Fore-aft direction vibration suppression technological scheme of introducing bandstop filter in generator speed-change oar rate control loop, in raising strong wind cut-out wind speed situation, emulate Fore-aft direction vibration acceleration in fan operation process, pylon bottom moment My load change trend;

When Figure 33 shows the tripping operation of generator side air-break switch, the variation tendency of generator electromagnetic torque;

Figure 34 and Figure 35 respectively illustrates the technological scheme and Fore-aft direction vibration suppression technological scheme of introducing bandstop filter in generator speed-change oar rate control loop, emulates Fore-aft direction vibration acceleration in fan operation process, pylon bottom moment My load change trend when generator side air-break switch trips;

Figure 36 is the block diagram of the control system of the raising blower fan cut-out wind speed illustrated according to a third embodiment of the present invention;

Figure 37 shows the graph of a relation of the wind speed-blower fan output power of the storm wind control program improving cut-out wind speed;

Figure 38 shows the turbulent wind improving the emulation of cut-out wind speed scheme and use;

In Figure 39 and Figure 40 solid line and dotted line represent respectively when emulation turbulent wind mean wind velocity between storm wind control between initial wind speed and new cut-out wind speed and wind speed be less than storm wind control initial wind speed time, adopt and improve cut-out wind speed scheme, generator speed setting value, the time dependent situation of blower fan output power in generator speed-electromagnetic torque control loop and generator speed-change oar rate control loop.

Figure 41 and Figure 42 respectively illustrates the technological scheme introducing Fore-aft direction vibration acceleration signal in generator speed-change oar rate control loop, at wind speed under storm wind controls the power generation mode between initial wind speed and new cut-out wind speed, to blower fan Fore-aft direction vibration acceleration, pylon My moment of flexure first natural frequency signal degrade condition;

Figure 43 and Figure 44 respectively illustrates the technological scheme introducing Side-side direction vibration acceleration signal in generator speed-electromagnetic torque control loop, at wind speed under storm wind controls the power generation mode between initial wind speed and new cut-out wind speed, to blower fan Side-side direction vibration acceleration, pylon Mx moment of flexure first natural frequency signal degrade condition;

In Figure 45, Figure 46 and Figure 47, solid line and dotted line respectively illustrate and in generator speed-change oar rate control loop, to introduce the technological scheme of Fore-aft direction vibration acceleration signal and do not introduce the technological scheme of Fore-aft direction vibration acceleration, simulation blade angle, Fore-aft direction vibration acceleration, pylon bottom moment My load change situation in blower fan strong wind start-up course;

In Figure 48 and Figure 49, solid line and dotted line respectively illustrate and in generator speed-electromagnetic torque control loop, to introduce the technological scheme of Side-side direction vibration acceleration signal and do not introduce the technological scheme of Side-side direction vibration acceleration, emulate Side-side direction vibration acceleration, pylon bottom moment Mx load change situation in blower fan strong wind start-up course.

Embodiment

Be described in detail the embodiment of the present invention now, its sample table shows in the accompanying drawings, and wherein, identical label represents same parts all the time.Be described to explain the present invention to embodiment below with reference to the accompanying drawings.

Fig. 1 is the block diagram of the blower fan pylon Side-side direction Vibration Suppression System illustrated according to a first embodiment of the present invention.The first embodiment of the present invention is mainly for blower fan pylon Side-side direction vibration suppression.

Generator speed measurement module (not shown), comparator 101, proportional integral (PI) controller 102, acceleration analysis module (not shown), integration module 103, band-pass filter 104, proportional gain module 105, adder 106 is comprised with reference to Fig. 1, blower fan pylon Side-side direction Vibration Suppression System.

Generator speed measurement module is arranged in fan engine room, measures generator speed (that is, obtaining generator speed measured value).Generator speed measured value and generator speed setting value compare by comparator 101.PI controller 102 receives the comparative result of comparator 101, carries out proportional integral computing to described comparative result, obtains the first control inputs value of generator electromagnetic torque.

Acceleration analysis module is arranged in fan engine room, measures the vibration acceleration in pylon Side-side direction.Integration module 103 receives the vibration acceleration that acceleration analysis module is measured, and carries out integral operation to described vibration acceleration.

The integral operation result of band-pass filter 104 pairs of integration module 103 carries out bandpass filtering, from the vibration acceleration in pylon Side-side direction, extract first natural frequency signal.The transfer function of band-pass filter 104 can be wherein, s represents complex variable, and ξ represents damping constant, and ω represents angular frequency.The function of band-pass filter 104 is exactly extract first natural frequency signal from the vibration acceleration signal in pylon Side-side direction.

The bandpass filtering result of proportional gain module 105 pairs of band-pass filters 104 carries out proportional gain amplification, obtains the second control inputs value of generator electromagnetic torque.

First control inputs value of generator electromagnetic torque and the second control inputs value of generator electromagnetic torque superpose by adder 106, obtain generator electromagnetic torque setting value.Generator electromagnetic torque setting value is imported in blower fan, for controlling the electromagnetic torque of blower fan, thus reduces the first natural frequency Oscillation Amplitude in pylon Side-side direction.

Preferably, the first low-pass filter 107 can be connected with between generator speed measurement module and comparator 101, first low-pass filter 107 pairs generator speed measured value carries out lower pass-filter, and the result of lower pass-filter is supplied to comparator 101, to compare with generator speed setting value.

In addition, the second low-pass filter 108 can be connected with at PI controller 102 and adder 106, the proportional integral result of the second low-pass filter 108 pairs of PI controllers 102 carries out lower pass-filter, the result of lower pass-filter is supplied to the first control inputs value of adder 106 as generator electromagnetic torque.

Fig. 2 shows the Open loop step response of wind speed-Side-side direction, cabin speed, wherein dotted line represents the technological scheme introducing bandstop filter in generator speed-electromagnetic torque control loop, solid line represents Side-side direction vibration suppression technological scheme, and clearly vibration suppression scheme in Side-side direction significantly can reduce the pylon Side-side direction first natural frequency Oscillation Amplitude caused by wind speed Spline smoothing.

Fig. 3 shows the Open loop step response of generator electromagnetic torque-Side-side direction, cabin speed, wherein dotted line represents the technological scheme introducing bandstop filter in generator speed-electromagnetic torque control loop, solid line represents Side-side direction vibration suppression technological scheme, and clearly vibration suppression scheme in Side-side direction significantly can reduce the pylon Side-side direction first natural frequency Oscillation Amplitude caused by generator electromagnetic torque Spline smoothing.

The open loop bode that Fig. 4 shows generator electromagnetic torque-Side-side direction, cabin speed schemes, wherein dotted line represents the technological scheme introducing bandstop filter in generator speed-electromagnetic torque control loop, solid line represents Side-side direction vibration suppression technological scheme, and clearly vibration suppression scheme in Side-side direction has larger decay to the vibration of pylon Side-side direction first natural frequency.

Fig. 5 and Fig. 6 respectively illustrates the closed loop step response of technological scheme and the Side-side direction vibration suppression technological scheme introducing bandstop filter in generator speed-electromagnetic torque control loop, the overshoot of obvious Side-side direction vibration suppression technological scheme is lower, and regulating time is shorter.

Fig. 7 and Fig. 8 respectively illustrates the closed loop bode figure of technological scheme and the Side-side direction vibration suppression technological scheme introducing bandstop filter in generator speed-electromagnetic torque control loop, the bandwidth of obvious Side-side direction vibration suppression technological scheme is larger, and speed of response is faster.

Fig. 9, Figure 10 and Figure 11 respectively illustrate the technological scheme and Side-side direction vibration suppression technological scheme of introducing bandstop filter in generator speed-electromagnetic torque control loop, Side-side direction vibration acceleration in fan starting process, pylon bottom moment Mx load, blade angle variation tendency is emulated under high wind conditions, the technological scheme of bandstop filter is introduced in the corresponding generator speed-electromagnetic torque control loop of dotted line, the corresponding Side-side direction vibration suppression technological scheme of solid line in each figure.Obvious Side-side direction vibration suppression technological scheme the vibration acceleration of Side-side direction first natural frequency and moment M x vibration amplitude less.

Figure 12, Figure 13 and Figure 14 respectively illustrate the technological scheme and Side-side direction vibration suppression technological scheme of introducing bandstop filter in generator speed-electromagnetic torque control loop, Side-side direction vibration acceleration in fan operation process, pylon bottom moment Mx load, blower fan output power variation tendency is emulated in raising strong wind cut-out wind speed situation, the technological scheme of bandstop filter is introduced in the corresponding generator speed-electromagnetic torque control loop of dotted line, the corresponding Side-side direction vibration suppression technological scheme of solid line in each figure.Obvious Side-side direction vibration suppression technological scheme significantly reduces at the vibration acceleration of Side-side direction first natural frequency and moment M x vibration amplitude.

In blower fan Side-side direction Vibration Suppression System according to a first embodiment of the present invention, by integration module, band-pass filter, proportional gain module, fan engine room vibration acceleration signal is incorporated in generator electromagnetic torque control, significantly improves the performance of wind speed-Side-side direction, cabin Speed open-loop control, generator torque-Side-side direction, cabin Speed open-loop control, generator speed-generator electromagnetic torque closed loop control; After the additional electric generator electromagnetic torque that fan engine room vibration acceleration signal is introduced after integration module, band-pass filter, proportional gain module is placed on the second low-pass filter, instead of the output terminal of PI controller, avoid the impact of the second low-pass filter on the additional electric generator electromagnetic torque signal phase that fan engine room vibration acceleration signal is introduced after integration module, band-pass filter, proportional gain module.

Adopt blower fan Side-side direction Vibration Suppression System according to a first embodiment of the present invention, under the various operating modes that can be in when generating electricity by way of merging two or more grid systems pattern at unit, the first natural frequency vibration amplitude in restriction Side-side direction, therefore plays a significant role for raising unit availability, lifting unit generated energy and unit adaptability aspect; Because generator speed-electromagnetic torque Control loop control system overshoot reduction, bandwidth increase, response time shorten, therefore in reduction generator speed wave range, particularly in suppression generator speed hypervelocity, there is very large help, the effect improving unit availability and generated energy can be realized equally; Blower fan Side-side direction Vibration Suppression System significantly can reduce the fatigue load of the first natural frequency moment M x in Side-side direction bottom pylon.

The second embodiment of the present invention is described below, and this embodiment is mainly for blower fan pylon Fore-aft direction vibration suppression.Figure 15 is the block diagram of the blower fan pylon Fore-aft direction Vibration Suppression System illustrated according to a second embodiment of the present invention.

Generator speed measurement module (not shown), comparator 201, proportion differential (PD) controller 202, acceleration analysis module (not shown), band-pass filter 203, second order filter 204, proportional gain module 205, adder 206 is comprised with reference to Figure 15, blower fan pylon Fore-aft direction Vibration Suppression System.

Generator speed measurement module is arranged in fan engine room, measures generator speed (that is, obtaining generator speed measured value).Generator speed measured value and generator speed setting value compare by comparator 201.PD controller 202 receives the comparative result of comparator 201, carries out proportion differential computing to described comparative result, obtains the first control inputs value that fan blade becomes oar speed.

The concise and to the point concept described about becoming oar below.Each blade (blade) and wind wheel plane of rotation (plane that when wind wheel rotates, blade shank the is inswept) shape of wind-driven generator at an angle, are called established angle, also referred to as propeller pitch angle.When propeller pitch angle is about 0 °, power coefficient is relatively maximum, and this angular range is called generating state blade frequent movement angular range.If propeller pitch angle increases, then power coefficient will obviously reduce.When propeller pitch angle is about 90 °, blade is static, and this angular range is called shutdown angular range.By changing propeller pitch angle (change oar), when wind speed is lower than following the trail of maximum wind speed to absorb wind energy as far as possible during rated wind speed, when wind speed is higher than rated wind speed, by adjusting the propeller pitch angle of blade, changing air-flow to the effect of blade, generator power can be kept constant.

Acceleration analysis module is arranged in fan engine room, measures the vibration acceleration in pylon Fore-aft direction.

Band-pass filter 203 receives the vibration acceleration that acceleration analysis module is measured, and carries out bandpass filtering, from the vibration acceleration in pylon Fore-aft direction, extract first natural frequency signal to described vibration acceleration.The transfer function of band-pass filter 203 can be the function of band-pass filter 203 is exactly extract first natural frequency signal from the vibration acceleration signal in pylon Fore-aft direction.

The bandpass filtering result of second order filter 204 pairs of band-pass filters 203 carries out second-order filter.The second-order filter result of proportional gain module 205 pairs of second order filters 204 carries out proportional gain amplification, obtains the second control inputs value that fan blade becomes oar speed.

Second control inputs value of the first control inputs value and fan blade change oar speed that fan blade is become oar speed by adder 206 superposes, and obtains fan blade and becomes oar speed setting value.Fan blade becomes oar speed setting value and is imported in blower fan, for controlling the change oar speed of blower fan, thus reduces the first natural frequency Oscillation Amplitude in pylon Fore-aft direction.

Preferably, the first low-pass filter 207 can be connected with between generator speed measurement module and comparator 201, first low-pass filter 207 pairs generator speed measured value carries out lower pass-filter, and the result of lower pass-filter is supplied to comparator 201, to compare with generator speed setting value.

In addition, the second low-pass filter 208 can be connected with at PD controller 202 and adder 206, the proportion differential result of the second low-pass filter 208 pairs of PD controllers 202 carries out lower pass-filter, the result of lower pass-filter is supplied to adder 206 becomes oar speed the first control inputs value as fan blade.

Blower fan Fore-aft direction Vibration Suppression System working principle is:

$M\stackrel{\·\·}{x}+D\stackrel{\·}{x}+\mathrm{Kx}=F+\mathrm{\δF}$

$\mathrm{\δF}=\frac{\∂F}{\∂\mathrm{\β}}\mathrm{\δ\β}=-D_p\stackrel{\·}{x}$

Wherein, M represents quality, and D represents damping, and K represents rigidity, and x represents nacelle top displacement, represent nacelle top speed, represent nacelle top acceleration, F represents end thrust, and δ F represents end thrust variable quantity, represent that end thrust is to the partial differential of blade angle, δ β represents blade angle variable quantity, D _prepresent the damping increased.

The Fore-aft direction tower movement of blower fan can be reduced to a second-order system, blower fan Fore-aft direction Vibration Suppression System is started with from the aspect of software, the change oar control action that artificial increase by is contrary with cabin, Fore-aft direction acceleration first natural frequency signal, as an additional external force, be equivalent to the damping term that equivalence adds the first natural frequency motion of pylon Fore-aft direction, thus play the object suppressing the first natural frequency vibration of blower fan Fore-aft direction.

The introducing of second order filter 204 becomes in oar speed-Fore-aft direction Speed open-loop control and generator speed-change oar speed closed loop control to increase, near the first natural frequency of pylon Fore-aft direction, the attenuation amplitude of the vibration of Fore-aft direction and generator speed signal, improves the performance controlled separately.

Figure 16 represents that becoming oar speed-cabin Speed open-loop control bode schemes.In figure 16, imaginary point line with x, solid black lines, dotted line represent respectively not to be introduced Fore-aft direction vibration suppression function, introduces Fore-aft direction vibration suppression function but only increase band-pass filter and introduce the system that Fore-aft direction vibration suppression function increases band-pass filter, second order filter simultaneously, and it becomes oar speed-cabin Speed open-loop control bode and schemes.As can be seen from Figure 16, introduce the scheme of band-pass filter and second order filter simultaneously, both can realize the significantly decay of Fore-aft direction first natural frequency vibration, and the negative effect that frequency causes near first natural frequency is also less.

Fore-aft direction Vibration Suppression System generator speed-change oar speed closed loop bode that Figure 17 and Figure 18 represents an introducing band-pass filter respectively and introduce band-pass filter and second order filter simultaneously schemes, near the first natural frequency of Fore-aft direction, Figure 18 has larger decay than generator speed signal in Figure 17.

The change that the yield value K that Figure 19 shows proportional gain module changes with angle of fan leaves (propeller pitch angle).The yield value K of proportional gain module is the numerical value changed along with angle of fan leaves change, but not a definite value, when blade angle is less than angle 1 or is greater than angle 2, yield value K remains on certain constant numerical value respectively, when blade angle is between angle 1 and angle 2, along with angle of fan leaves increases, yield value linearly reduces.

Figure 20 shows the Open loop step response of wind speed-cabin speed, wherein dotted line represents the technological scheme introducing bandstop filter in generator speed-change oar rate control loop, solid line represents Fore-aft direction vibration suppression technological scheme, and clearly vibration suppression scheme in Fore-aft direction significantly can reduce the pylon Fore-aft direction first natural frequency vibration caused by wind speed Spline smoothing.

Figure 21 shows the Open loop step response of generator electromagnetic torque-cabin speed, wherein dotted line represents the technological scheme introducing bandstop filter in generator speed-change oar rate control loop, solid line represents Fore-aft direction vibration suppression technological scheme, and clearly vibration suppression scheme in Fore-aft direction significantly can reduce the pylon Fore-aft direction first natural frequency vibration caused by generator electromagnetic torque Spline smoothing.

Figure 22 and Figure 23 respectively illustrates and introduce the technological scheme of bandstop filter and the closed loop step response of Fore-aft direction vibration suppression technological scheme in generator speed-change oar rate control loop, the overshoot of obvious Fore-aft direction vibration suppression technological scheme is lower, and regulating time is shorter.

Figure 24 and Figure 25 respectively illustrates the closed loop bode figure of technological scheme and the Fore-aft direction vibration suppression technological scheme introducing bandstop filter in generator speed-change oar rate control loop, the bandwidth of obvious Fore-aft direction vibration suppression technological scheme is larger, and speed of response is faster.

Figure 26, Figure 27 and Figure 28 respectively illustrate the technological scheme and Fore-aft direction vibration suppression technological scheme of introducing bandstop filter in generator speed-change oar rate control loop, fan starting process Leaf angle, Fore-aft direction vibration acceleration, pylon bottom moment My load change trend is emulated under high wind conditions, the technological scheme of bandstop filter is introduced in the corresponding generator speed-change oar rate control loop of dotted line, the corresponding Fore-aft direction vibration suppression technological scheme of solid line in each figure.Obvious Fore-aft direction vibration suppression technological scheme the acceleration of Fore-aft direction first natural frequency and moment M y vibration amplitude less.

Figure 29 and Figure 30 respectively illustrates the technological scheme and Fore-aft direction vibration suppression technological scheme of introducing bandstop filter in generator speed-change oar rate control loop, fan operation process Leaf angle, Fore-aft direction vibration acceleration variation tendency is emulated under little landscape condition, the technological scheme of bandstop filter is introduced in the corresponding generator speed-change oar rate control loop of dotted line, the corresponding Fore-aft direction vibration suppression technological scheme of solid line in each figure.Obvious Fore-aft direction vibration suppression technological scheme significantly reduces at the acceleration vibration amplitude of Fore-aft direction first natural frequency.

Figure 31 and Figure 32 respectively illustrates the technological scheme and Fore-aft direction vibration suppression technological scheme of introducing bandstop filter in generator speed-change oar rate control loop, Fore-aft direction vibration acceleration in fan operation process, pylon bottom moment My load change trend is emulated in raising strong wind cut-out wind speed situation, the technological scheme of bandstop filter is introduced in the corresponding generator speed-change oar rate control loop of dotted line, the corresponding Fore-aft direction vibration suppression technological scheme of solid line in each figure.Obvious Fore-aft direction vibration suppression technological scheme significantly reduces at the acceleration of Fore-aft direction first natural frequency and moment M y vibration amplitude.

When Figure 33 shows the tripping operation of generator side air-break switch, the variation tendency of generator electromagnetic torque.

Figure 34 and Figure 35 respectively illustrates the technological scheme and Fore-aft direction vibration suppression technological scheme of introducing bandstop filter in generator speed-change oar rate control loop, Fore-aft direction vibration acceleration in fan operation process, pylon bottom moment My load change trend is emulated when generator side air-break switch trips, the technological scheme of bandstop filter is introduced in the corresponding generator speed-change oar rate control loop of dotted line, the corresponding Fore-aft direction vibration suppression technological scheme of solid line in each figure.Obvious Fore-aft direction vibration suppression technological scheme significantly reduces at the acceleration of Fore-aft direction first natural frequency and moment M y vibration amplitude.

In blower fan Fore-aft direction Vibration Suppression System according to a second embodiment of the present invention, by band-pass filter, second order filter, proportional gain module, fan engine room vibration acceleration signal is incorporated in the control of change oar speed, significantly improves the performance becoming oar speed-Fore-aft direction, cabin Speed open-loop control, wind speed-Fore-aft direction, cabin Speed open-loop control, generator torque-Fore-aft direction, cabin Speed open-loop control, generator speed-change oar speed closed loop control; The introducing of second order filter reduces band-pass filter near the first natural frequency of Fore-aft direction to the negative effect becoming oar speed-cabin Fore-aft Speed open-loop control and generator speed-change oar speed closed loop control; Proportional gain module is designed to on-fixed value, guarantees each wind speed point from rated wind speed to cut-out wind speed, and in Fore-aft direction, corresponding first natural frequency vibration attenuation is designed to identical amplitude; The change oar speed that fan engine room vibration acceleration signal is introduced after band-pass filter, second order filter, proportional gain module, after being placed on the second low-pass filter, instead of the output terminal of PD controller, thus avoid the impact of the second low-pass filter on the change oar rate signal phase place that fan engine room vibration acceleration signal is introduced after band-pass filter, second order filter, proportional gain module.

Adopt blower fan Fore-aft direction Vibration Suppression System according to a second embodiment of the present invention, except more than rated wind speed and unit limits except the vibration of Fore-aft direction first natural frequency under being in full hair-like state, in the stage suppression Fore-aft direction first natural frequency vibration such as Spline smoothing, raising cut-out wind speed by a relatively large margin of little wind, strong wind startup, the above wind speed of rated wind speed, therefore raising unit availability, lifting unit generated energy and unit adaptability aspect can also be played a significant role; Because generator speed-change oar speed closed loop control system overshoot reduction, bandwidth increase, response time shorten, therefore in reduction generator speed wave range, particularly in suppression generator speed hypervelocity, there is very large help, can realize equally improving blower fan availability and generated energy; Due to can when generator side air-break switch trips, significantly reduce My bending load peak value bottom Fore-aft direction fundamental frequency Oscillation Amplitude and pylon, therefore for the Security improving unit, the cost particularly reducing crew base will play very large effect, and complete machine cost is minimized.

The third embodiment of the present invention is described below, and this embodiment is mainly to improve blower fan cut-out wind speed, and can suppress blower fan pylon Side-side direction and the vibration of Fore-aft direction for the cut-out wind speed improved.3rd embodiment contains the appropriately combined of the first embodiment and the second embodiment.

Figure 36 is the block diagram of the control system of the raising blower fan cut-out wind speed illustrated according to a third embodiment of the present invention.

With reference to Figure 36, improve blower fan pylon Vibration Suppression System and comprise measuring wind speed module (not shown), first low-pass filter 301, wind speed-generator rated speed conversion module 302, second low-pass filter 303, generator speed measurement module (not shown), first comparator 304, proportional integral (PI) controller 305, acceleration analysis module (not shown), integration module 306, first band-pass filter 307, first proportional gain module 308, first adder 309, second comparator 312, proportion differential (PD) controller 313, second band-pass filter 314, second order filter 315, second proportional gain module 316, second adder 317.

Measuring wind speed module is arranged on fan engine room, for measuring wind farm wind velocity.The wind speed that first low-pass filter 301 pairs measuring wind speed module is measured carries out lower pass-filter.Wind speed-generator rated speed conversion module 302 receives the result of lower pass-filter from the first low-pass filter 301, converse generator rated speed.Figure 36 shows the relation between generator rated speed and wind speed.The generator rated speed that second low-pass filter 303 pairs wind speed-generator rated speed conversion module 302 converses carries out lower pass-filter, obtains generator speed setting value.

Wind speed-generator rated speed conversion module 302 converses generator rated speed, when wind speed exceedes the cut-out wind speed of existing design, can reduce the rated speed of generator, improve cut-out wind speed thus.The amplitude of final raising cut-out wind speed is relevant to the LOAD FOR result (load-carrying ability) of blower fan.Adopt the mode reducing rated speed setting value, need to ensure that LOAD FOR result can within design load scope.

When improve the cut-out wind speed of blower fan, the vibration in the pylon Side-side direction of blower fan and the vibration in pylon Fore-aft direction increase, and therefore need to suppress vibration, will be described in detail below.

Generator speed measurement module is arranged in fan engine room, measures generator speed (that is, obtaining generator speed measured value).Generator speed measured value and generator speed setting value compare by the first comparator 304.PI controller 305 receives the comparative result of the first comparator 304, carries out proportional integral computing to described comparative result, obtains the first control inputs value of generator electromagnetic torque.

Acceleration analysis module is arranged in fan engine room, measures the vibration acceleration in pylon Side-side direction and the vibration acceleration in pylon Fore-aft direction.Integration module 306 receives the vibration acceleration in the pylon Side-side direction that acceleration analysis module is measured, and carries out integral operation to described vibration acceleration.

The integral operation result of the first band-pass filter 307 pairs of integration module 306 carries out bandpass filtering, from the vibration acceleration in pylon Side-side direction, extract first natural frequency signal.The transfer function of band-pass filter 307 can be the function of the first band-pass filter 307 is exactly extract first natural frequency signal from the vibration acceleration signal in pylon Side-side direction.

The bandpass filtering result of the first proportional gain module 308 to the first band-pass filter 307 carries out proportional gain amplification, obtains the second control inputs value of generator electromagnetic torque.

First control inputs value of generator electromagnetic torque and the second control inputs value of generator electromagnetic torque superpose by first adder 309, obtain generator electromagnetic torque setting value.Generator electromagnetic torque setting value is imported in blower fan, for controlling the electromagnetic torque of blower fan, thus reduces the first natural frequency Oscillation Amplitude in pylon Side-side direction.

Preferably, the 3rd low-pass filter 310 can be connected with between generator speed measurement module and the first comparator 304,3rd low-pass filter 310 pairs generator speed measured value carries out lower pass-filter, the result of lower pass-filter is supplied to the first comparator 304, to compare with generator speed setting value.

In addition, the 4th low-pass filter 311 can be connected with at PI controller 305 and first adder 309, the proportional integral result of the 4th low-pass filter 311 pairs of PI controllers 305 carries out lower pass-filter, the result of lower pass-filter is supplied to the first control inputs value of first adder 309 as generator electromagnetic torque.

Generator speed measured value and generator speed setting value compare by the second comparator 312.PD controller 313 receives the comparative result of the second comparator 312, carries out proportion differential computing to described comparative result, obtains the first control inputs value that fan blade becomes oar speed.

Second band-pass filter 314 receives the vibration acceleration in the pylon Fore-aft direction that acceleration analysis module is measured, and carries out bandpass filtering, from the vibration acceleration in pylon Fore-aft direction, extract first natural frequency signal to described vibration acceleration.The transfer function of the second band-pass filter 314 can be the function of the second band-pass filter 314 is exactly extract first natural frequency signal from the vibration acceleration signal in pylon Fore-aft direction.

The bandpass filtering result of second order filter 315 to the second band-pass filter 314 carries out second-order filter.The second-order filter result of the second proportional gain module 316 pairs of second order filters 315 carries out proportional gain amplification, obtains the first control inputs value that fan blade becomes oar speed.

Second control inputs value of the first control inputs value and fan blade change oar speed that fan blade is become oar speed by second adder 317 superposes, and obtains fan blade and becomes oar speed setting value.Fan blade becomes oar speed setting value and is imported in blower fan, for controlling the change oar speed of blower fan, thus reduces the first natural frequency Oscillation Amplitude in pylon Fore-aft direction.

Preferably, the 5th low-pass filter 318 can be connected with between generator speed measurement module and the second comparator 312,5th low-pass filter 318 pairs generator speed measured value carries out lower pass-filter, the result of lower pass-filter is supplied to the second comparator 312, to compare with generator speed setting value.

In addition, the 6th low-pass filter 319 can be connected with at PD controller 313 and second adder 317, the proportion differential result of the 6th low-pass filter 319 pairs of PD controllers 313 carries out lower pass-filter, the result of lower pass-filter is supplied to second adder 317 becomes oar speed the first control inputs value as fan blade.

Blower fan Fore-aft direction Vibration Suppression System working principle is:

$M\stackrel{\·\·}{x}+D\stackrel{\·}{x}+\mathrm{Kx}=F+\mathrm{\δF}$

$\mathrm{\δF}=\frac{\∂F}{\∂\mathrm{\β}}\mathrm{\δ\β}=-D_p\stackrel{\·}{x}$

The Fore-aft direction tower movement of blower fan can be reduced to a second-order system, blower fan Fore-aft direction Vibration Suppression System is started with from the aspect of software, the change oar control action that artificial increase by is contrary with cabin, Fore-aft direction acceleration first natural frequency signal, as an additional external force, be equivalent to the damping term that equivalence adds the first natural frequency motion of pylon Fore-aft direction, thus play the object suppressing the first natural frequency vibration of blower fan Fore-aft direction.

The introducing of second order filter 315 becomes in oar speed-Fore-aft direction Speed open-loop control and generator speed-change oar speed closed loop control to increase, near the first natural frequency of pylon Fore-aft direction, the attenuation amplitude of the vibration of Fore-aft direction and generator speed signal, improves the performance controlled separately.

Figure 37 shows the graph of a relation of the wind speed-blower fan output power of the storm wind control program improving cut-out wind speed, and wherein storm wind controls the corresponding cut-out wind speed used at present of initial wind speed.When wind farm wind velocity controls initial wind speed lower than storm wind, blower fan output power is still the rated power of unit, when wind farm wind velocity controls between the cut-out wind speed after initial wind speed to raising between storm wind, keep the specified electromagnetic torque of generator constant, now the output power of blower fan linearly reduces along with generator speed setting value and reduces.When wind farm wind velocity higher than improve after cut-out wind speed time, blower fan is out of service, and blower fan output power is zero.

Should be appreciated that, at blower fan Side-side direction of the present invention Vibration Suppression System (namely, first embodiment) and blower fan Fore-aft direction Vibration Suppression System (that is, the second embodiment) of the present invention in, generator speed setting value is changeless; And in the control system (that is, the 3rd embodiment) of raising blower fan cut-out wind speed of the present invention, generator speed setting value is adjustable along with wind farm wind velocity changes.

Figure 38 shows the turbulent wind improving the emulation of cut-out wind speed scheme and use, and the corresponding mean wind velocity of this turbulent wind controls between initial wind speed and new cut-out wind speed between storm wind.

In Figure 39 and Figure 40 solid line and dotted line represent respectively when emulation turbulent wind mean wind velocity between storm wind control between initial wind speed and new cut-out wind speed and wind speed be less than storm wind control initial wind speed time, adopt and improve cut-out wind speed scheme, generator speed setting value, the time dependent situation of blower fan output power in generator speed-electromagnetic torque control loop and generator speed-change oar rate control loop.

Figure 41 and Figure 42 respectively illustrates the technological scheme introducing Fore-aft direction vibration acceleration signal in generator speed-change oar rate control loop, at wind speed under storm wind controls the power generation mode between initial wind speed and new cut-out wind speed, to blower fan Fore-aft direction vibration acceleration, pylon My moment of flexure first natural frequency signal degrade condition, solid line represents the technological scheme introducing Fore-aft direction vibration acceleration signal, and dotted line represents the technological scheme not introducing Fore-aft direction vibration acceleration signal.

Figure 43 and Figure 44 respectively illustrates the technological scheme introducing Side-side direction vibration acceleration signal in generator speed-electromagnetic torque control loop, at wind speed under storm wind controls the power generation mode between initial wind speed and new cut-out wind speed, to blower fan Side-side direction vibration acceleration, pylon Mx moment of flexure first natural frequency signal degrade condition, solid line represents the technological scheme introducing Side-side direction vibration acceleration signal, and dotted line represents the technological scheme not introducing Side-side direction vibration acceleration signal.

Figure 45, in Figure 46 and Figure 47, solid line and dotted line respectively illustrate and in generator speed-change oar rate control loop, to introduce the technological scheme of Fore-aft direction vibration acceleration signal and do not introduce the technological scheme of Fore-aft direction vibration acceleration, simulation blade angle in blower fan strong wind start-up course, Fore-aft direction vibration acceleration, pylon bottom moment My load change situation, obviously Fore-aft direction vibration acceleration signal is incorporated into generator speed-change oar rate control loop, significantly can reduce acceleration and the moment M y vibration amplitude of Fore-aft direction first natural frequency.

In Figure 48 and Figure 49, solid line and dotted line respectively illustrate and in generator speed-electromagnetic torque control loop, to introduce the technological scheme of Side-side direction vibration acceleration signal and do not introduce the technological scheme of Side-side direction vibration acceleration, Side-side direction vibration acceleration is emulated in blower fan strong wind start-up course, pylon bottom moment Mx load change situation, obviously Side-side direction vibration acceleration signal is incorporated into generator speed-electromagnetic torque control loop, significantly can reduce acceleration and the moment M x vibration amplitude of Side-side direction first natural frequency.

Because blower fan pylon Side-side direction and the vibration of Fore-aft direction are inhibited, the cut-out wind speed of blower fan therefore can be improved.

Blower fan improves the control system of cut-out wind speed under the prerequisite ensureing unit safety, under blower fan can be in the pattern of generating electricity by way of merging two or more grid systems in higher wind speed range, therefore, within 20 year working life of blower fan, the generated energy of unit can increase considerably, and wind energy turbine set investment return significantly promotes, by pylon Fore-aft direction vibration acceleration signal is introduced generator speed-change oar speed close loop control circuit, and pylon Side-side direction vibration acceleration signal is introduced generator speed-electromagnetic torque Control loop control loop, under significantly can being reduced in strong wind start-up course and improving the pattern of generating electricity by way of merging two or more grid systems after cut-out wind speed, the amplitude that blower fan vibrates in Fore-aft direction and Side-side direction pylon first natural frequency acceleration signal, and pylon Side-side direction Mx moment of flexure, the amplitude of Fore-aft direction My moment of flexure vibration and fatigue load, thus ensure that improving cut-out wind speed control program is achieved.

Control system according to blower fan pylon Vibration Suppression System of the present invention and raising blower fan cut-out wind speed can be applicable to directly drive megawatt blower fan.

Although shown and described some embodiments, it should be appreciated by those skilled in the art that without departing from the principles and spirit of the present invention, can modify to these embodiments, scope of the present invention is by claim and equivalents thereof.

Claims (13)

1. blower fan pylon with the Vibration Suppression System in the impeller direction that direction is vertical windward, it is characterized in that, described Vibration Suppression System comprises:

Generator speed measurement module, is arranged in fan engine room, measures generator speed, to obtain generator speed measured value;

Comparator, compares generator speed measured value and generator speed setting value;

Proportional plus integral controller, receives the comparative result of comparator, carries out proportional integral computing, obtain the first control inputs value of generator electromagnetic torque to described comparative result;

Acceleration analysis module, is arranged in fan engine room, that measure pylon with vibration acceleration that the is impeller direction that direction is vertical windward;

Integration module, receives the vibration acceleration that acceleration analysis module is measured, carries out integral operation to described vibration acceleration;

Band-pass filter, carries out bandpass filtering to the integral operation result of integration module, extracts first natural frequency signal from pylon with the vibration acceleration in the impeller direction that direction is vertical windward;

Proportional gain module, carries out proportional gain amplification to the bandpass filtering result of band-pass filter, obtains the second control inputs value of generator electromagnetic torque;

Adder, first control inputs value of generator electromagnetic torque and the second control inputs value of generator electromagnetic torque are superposed, obtain generator electromagnetic torque setting value, described generator electromagnetic torque setting value for controlling the electromagnetic torque of blower fan, thus reduce pylon with the first natural frequency Oscillation Amplitude in the impeller direction that direction is vertical windward.

2. Vibration Suppression System according to claim 1, also comprise: the first low-pass filter, be connected between generator speed measurement module and comparator, lower pass-filter is carried out to generator speed measured value, the result of lower pass-filter is supplied to comparator, to compare with generator speed setting value.

3. Vibration Suppression System according to claim 1, also comprise: the second low-pass filter, be connected between proportional plus integral controller and adder, the proportional integral result of comparative example integral controller carries out lower pass-filter, the result of lower pass-filter is supplied to the first control inputs value of adder as generator electromagnetic torque.

4. the Vibration Suppression System in the impeller of blower fan pylon direction windward, it is characterized in that, described Vibration Suppression System comprises:

Generator speed measurement module, is arranged in fan engine room, measures generator speed, to obtain generator speed measured value;

Comparator, compares generator speed measured value and generator speed setting value;

Proportional plus derivative controller, receives the comparative result of comparator, carries out proportion differential computing to described comparative result, obtains the first control inputs value that fan blade becomes oar speed;

Acceleration analysis module, is arranged in fan engine room, measures the vibration acceleration in the impeller direction windward of pylon;

Band-pass filter, receives the vibration acceleration that acceleration analysis module is measured, carries out bandpass filtering to described vibration acceleration, from the vibration acceleration in the impeller of pylon direction windward, extract first natural frequency signal;

Second order filter, carries out second-order filter to the bandpass filtering result of band-pass filter;

Proportional gain module, carries out proportional gain amplification to the second-order filter result of second order filter, obtains the second control inputs value that fan blade becomes oar speed;

Adder, second control inputs value of the first control inputs value and fan blade change oar speed that fan blade are become oar speed superposes, obtain fan blade and become oar speed setting value, described fan blade becomes oar speed setting value for controlling the change oar speed of blower fan, thus the first natural frequency Oscillation Amplitude in the impeller reducing pylon direction windward.

5. Vibration Suppression System according to claim 4, also comprise: the first low-pass filter, be connected between generator speed measurement module and comparator, lower pass-filter is carried out to generator speed measured value, the result of lower pass-filter is supplied to comparator, to compare with generator speed setting value.

6. Vibration Suppression System according to claim 4, also comprise: the second low-pass filter, be connected between proportional plus derivative controller and adder, the proportion differential result of comparative example derivative controller carries out lower pass-filter, the result of lower pass-filter is supplied to adder becomes oar speed the first control inputs value as fan blade.

7. improve blower fan cut-out wind speed and a control system for suppression vibration, it is characterized in that, described control system comprises:

Measuring wind speed module, is arranged on fan engine room, for measuring wind farm wind velocity;

First low-pass filter, carries out lower pass-filter to the wind speed that measuring wind speed module is measured;

Wind speed-generator rated speed conversion module, receives the result of lower pass-filter, converses generator rated speed from the first low-pass filter;

Second low-pass filter, carries out lower pass-filter to the generator rated speed that wind speed-generator rated speed conversion module converses, obtains described generator speed setting value;

Generator speed measurement module, is arranged in fan engine room, measures generator speed, to obtain generator speed measured value;

First comparator, compares generator speed measured value and generator speed setting value;

Proportional plus integral controller, receives the comparative result of the first comparator, carries out proportional integral computing to described comparative result, obtains the first control inputs value of generator electromagnetic torque;

Acceleration analysis module, is arranged in fan engine room, that measure pylon with vibration acceleration that the is impeller impeller direction windward of the vibration acceleration in the direction that direction is vertical and pylon windward;

Integration module, that receive the pylon that acceleration analysis module measures with vibration acceleration that the is impeller direction that direction is vertical windward, integral operation is carried out to described vibration acceleration;

First band-pass filter, carries out bandpass filtering to the integral operation result of integration module, extracts first natural frequency signal from pylon with the vibration acceleration in the impeller direction that direction is vertical windward;

First proportional gain module, carries out proportional gain amplification to the bandpass filtering result of the first band-pass filter, obtains the second control inputs value of generator electromagnetic torque;

First adder, first control inputs value of generator electromagnetic torque and the second control inputs value of generator electromagnetic torque are superposed, obtain generator electromagnetic torque setting value, described generator electromagnetic torque setting value for controlling the electromagnetic torque of blower fan, thus reduce pylon with the first natural frequency Oscillation Amplitude in the impeller direction that direction is vertical windward;

Second comparator, compares generator speed measured value and generator speed setting value;

Proportional plus derivative controller, receives the comparative result of the second comparator, carries out proportion differential computing to described comparative result, obtains the first control inputs value that fan blade becomes oar speed;

Second band-pass filter, the vibration acceleration in the impeller receiving the pylon that acceleration analysis module is measured direction windward, carries out bandpass filtering to described vibration acceleration, from the vibration acceleration in the impeller of pylon direction windward, extract first natural frequency signal;

Second order filter, carries out second-order filter to the bandpass filtering result of the second band-pass filter;

Second proportional gain module, carries out proportional gain amplification to the second-order filter result of second order filter, obtains the second control inputs value that fan blade becomes oar speed;

Second adder, second control inputs value of the first control inputs value and fan blade change oar speed that fan blade are become oar speed superposes, obtain fan blade and become oar speed setting value, described fan blade becomes oar speed setting value for controlling the change oar speed of blower fan, thus the first natural frequency Oscillation Amplitude in the impeller reducing pylon direction windward.

8. control system according to claim 7, also comprise: the 3rd low-pass filter, be connected between generator speed measurement module and the first comparator, lower pass-filter is carried out to generator speed measured value, the result of lower pass-filter is supplied to the first comparator, to compare with generator speed setting value.

9. control system according to claim 7, also comprise: the 4th low-pass filter, be connected between proportional plus integral controller and first adder, the proportional integral result of comparative example integral controller carries out lower pass-filter, the result of lower pass-filter is supplied to the first control inputs value of first adder as generator electromagnetic torque.

10. control system according to claim 7, also comprise: the 5th low-pass filter, be connected between generator speed measurement module and the second comparator, lower pass-filter is carried out to generator speed measured value, the result of lower pass-filter is supplied to the second comparator, to compare with generator speed setting value.

11. control system according to claim 7, also comprise: the 6th low-pass filter, be connected between proportional plus derivative controller and second adder, the proportion differential result of comparative example derivative controller carries out lower pass-filter, the result of lower pass-filter is supplied to second adder becomes oar speed the first control inputs value as fan blade.

12. control system according to claim 7, is characterized in that, when wind farm wind velocity controls initial wind speed lower than storm wind, blower fan output power is the rated power of blower fan; When wind farm wind velocity controls between initial wind speed and blower fan cut-out wind speed at storm wind, the specified electromagnetic torque of generator remains unchanged, and the output power of blower fan reduces along with generator speed setting value and reduces; When wind farm wind velocity is higher than blower fan cut-out wind speed, blower fan is out of service, and output power is zero.

13. control system according to claim 7, is characterized in that, when wind speed exceedes the design cut-out wind speed of blower fan, reduce the rated speed of generator, improve blower fan cut-out wind speed thus.