CN103779873A - Low-voltage ride-through control method for hydraulic wind generating set - Google Patents
Low-voltage ride-through control method for hydraulic wind generating set Download PDFInfo
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- CN103779873A CN103779873A CN201410015144.4A CN201410015144A CN103779873A CN 103779873 A CN103779873 A CN 103779873A CN 201410015144 A CN201410015144 A CN 201410015144A CN 103779873 A CN103779873 A CN 103779873A
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Abstract
The invention relates to a low-voltage ride-through control method for a hydraulic wind generating set. When the voltage of a power grid drops, a rotating controller realizes variable-displacement-motor tilt angle control so as to make high-voltage pressure of a hydraulic system drop rapidly so that the rotation speed of a metering pump is increased and thus remaining power is stored in a wind wheel. When energy storage quantity of the wind wheel reaches a set value, a power controller controls opening of a proportional throttle valve and converts redundant energy of the system into heat energy. Controllable variants in the system include control signals of the proportional throttle valve and control signals of a swash-plate tilt angle of the variable displacement motor. The low-voltage ride-through control method for the hydraulic wind generating set adopts a double-variant control strategy and a control system has two controlled variants which are controlled in a coordinated manner; a coordinated control method for the two controlled variants and an energy distribution scheme are proposed; a proportional throttle unit is added so as to speed up responses of the whole system; and at the same time, the system has more than one controllable parameter so that control is more flexible.
Description
Technical field
The invention belongs to technical field of wind power generation, relate to the main transmission of hydraulic wind-driven generator, replace traditional gearbox drive system and direct-drive type drive system, particularly a kind of hydraulic low voltage traversing control method of wind generator set by hydraulic transmission equipment and hydraulic control system.
Background technology
Wind energy resources is clean regenerative resource, does not consume any fuel, does not also produce carbon dioxide, free from environmental pollution.Wind power generation is the most ripe, the on the largest scale exploitation condition of new energy technology and has one of generation mode of commercialized development prospect.A lot of countries in the world, especially developed country, has recognized the importance of wind-powered electricity generation readjusting the energy structure, alleviate the sides such as environmental pollution, has given great attention to the exploitation of wind-powered electricity generation.
Produce till now from wind energy conversion system, wind energy conversion system drive system has experienced gear-box type, direct-drive type and three kinds of type of belt drive of incipient hydraulic in recent years.
At present, gear-box type wind turbine generator is because time of occurrence is long, and technology is relatively ripe, is widely used.It mainly comprises the parts such as wind wheel, gear box, generator, rectifier and inverter, and gear box is its key components and parts, is input as the slow-speed of revolution of wind wheel, is output as the high rotating speed of generator, and both have stable speed increasing ratio.The generator of gear-box type wind turbine generator generally adopts double-fed asynchronous generator at present, and wind turbine generator realizes variable speed constant frequency by control rectification, alternation system.
Direct-drive aerogenerator group is omitted gear box, and wind wheel is directly connected with generator, and generator is connected with electrical network by rectifier, inverter etc.Because wind speed round is lower, require direct-connected generator under the slow-speed of revolution, normally to move, generator number of poles is more, and volume is large, and weight is large, and realizes the electronic control method complexity of frequency conversion constant speed.
Hydraulic wind turbine generator adopts constant displacement pump-variable displacement motor closed hydraulic loop, wind wheel is connected with constant displacement pump, variable displacement motor is connected with generator, adopt hydraulic system to replace gear box, being rigidly connected of wind wheel and generator is converted into and flexibly connected, in the large and violent situation of fluctuations in wind speed, there is good damping buffering effect at wind speed, effectively extend unit durability.Comprehensive detection is analyzed wind speed round, wind speed and constant displacement pump rate of discharge, and the pivot angle of control variables motor, makes motor operate at all the time 1500r/min, and the electric energy frequency that 4 utmost point synchronous generators are transported to electrical network is 50Hz, meets mains frequency requirement.
The same with other wind-driven generators, hydraulic wind turbine generator need to possess low voltage ride-through capability, in the time that electric network fault or disturbance cause that the voltage of wind farm grid-connected point falls, in the scope of falling in certain voltage, wind-powered electricity generation unit can uninterruptedly be incorporated into the power networks.And provide certain reactive power to electrical network, and support power system restoration, until power system restoration is normal, thus " passing through " this low-voltage time (region).
China has proposed to explicitly call for to wind-powered electricity generation unit and wind energy turbine set low voltage crossing process: 1) the wind-powered electricity generation unit in wind energy turbine set has the low voltage ride-through capability of the 625ms that can keep being incorporated into the power networks in the time that grid-connected point voltage falls to 20% rated voltage; 2) wind farm grid-connected point voltage after falling, in 3s, can return to rated voltage 90% time, wind-powered electricity generation unit in wind energy turbine set keeps being incorporated into the power networks.For the wind energy turbine set that does not still possess low voltage ride-through capability and put into operation at present, should actively develop Transformation of Unit work, to possess low voltage ride-through capability; 3), to not cutting out the wind energy turbine set of electrical network between age at failure, its active power is fast quick-recovery after failure removal, returns to the value before fault with the power variation rate of at least 10% rated power/second.
At present, hydraulic low voltage cross-over of wind generator set control technology state of development:
In Chinese patent CN200980136335.3, the turbine speed control system of ChapDrive company of Norway research and development, adopt constant displacement pump-variable displacement motor closed type hydraulic system, control system adopts turbine rotor rotary speed feedback control loop and pressure feedback control ring, set variable displacement motor discharge capacity by tach signal and pressure signal respectively, effectively realize low voltage crossing control.And its control variables only has motor pivot angle, adjustable parameter is less, controls underaction.
In European patent EP 2481917A1A, ChapDrive company of Norway has proposed a kind of hydraulic low voltage cross-over of wind generator set control system.This system comprises control unit and a flow control valve being connected across between pressure duct and low pressure line, the voltage of electrical network is sent to control unit, flow control valve receives signal from control unit, and then it is mobile to the fluid of low pressure line to control pressure duct, finally realizes low voltage crossing.There are variable displacement motor pivot angle and two control variables of flow control valve in the method, controls more flexibly, but two control variables control method for coordinating and energy distribution scheme in control procedure do not set forth.
Summary of the invention
The object of this invention is to provide a kind of hydraulic low voltage traversing control method of wind generator set, break down while causing line voltage transient state to be fallen system is controlled for electrical network.This control method possesses the ensuring smooth transmission of conventional hydraulic type wind turbine generator, advantage that reliability is high, has avoided the single shortcoming of its control variables simultaneously.
For the technical problem that solves above-mentioned existence realizes goal of the invention, the present invention is achieved by the following technical solutions:
A kind of hydraulic low voltage traversing control method of wind generator set, the hydraulic system hardware configuration that realizes this control method comprises wind wheel 1, the first torque and speed sensors 2, constant displacement pump 3, pressure duct 4, the first unidirectional valve 5, the first pressure sensor 6, proportional throttle valve 7, the second pressure sensor 8, flow sensor 9, safety valve 10, variable displacement motor 11, the second torque and speed sensors 12, generator 13, multifunction instrument 14, electrical network 15, slippage pump 16, overflow valve 17, fuel tank 18, the second unidirectional valve 19, low pressure line 20, air velocity transducer 21, element and the devices such as power controller 22 and rotational speed governor 23,
Control method comprises following content:
In the time that line voltage falls, first rotational speed governor 23 control variables motor 11 pivot angles: rotational speed governor 23 gathers generator 13 rotating speeds by the second torque and speed sensors 12, flow sensor 9 gathers flow after throttling, multifunction instrument 14 gathers mains frequency, then rotational speed governor 23 is exported control signal, realize variable displacement motor 11 pivot angle controls, increase the discharge capacity of variable displacement motor 11, the high-pressure of hydraulic system is reduced rapidly, thereby the rotating speed that increases constant displacement pump 3, stores dump power into wind wheel 1 with this;
In the time that wind wheel 1 storage power reaches set point, power controller 22 control ratio choke valves 7: first power controller 22 gathers wind speed by air velocity transducer 21, the first torque and speed sensors 2 gathers wind speed round, the first pressure sensor 6 gathers that pressure before throttling, the second pressure sensor 8 gather pressure after throttling, multifunction instrument 14 gathers generator 13 power, then power sensor 22 is exported control signal, control ratio choke valve 7 apertures, are converted into heat energy by system excess energy;
The Collaborative Control of passing ratio choke valve 7 and variable displacement motor 11 pivot angles, final realization controlled hydraulic system and generator 13 transient responses, and excess energy in system is implemented to reasonable distribution, thereby realizes low voltage crossing.
The present invention is made up of proportional throttle valve and enclosed constant displacement pump variable displacement motor speed control system two parts of power control on constant displacement pump variable displacement motor loop, makes whole system have two controllable variable: proportional throttle valve 7 and variable displacement motor 11 pivot angles.
The present invention is broken down while causing line voltage transient state to be fallen at electrical network, hydraulic system and generator transient response is controlled, and excess energy in system is implemented to reasonable distribution.Hydraulic system and generator transient control concrete grammar are: when electrical network breaks down while causing line voltage transient state to be fallen, by control variables motor pivot angle, realize variable displacement motor and mate with the dynamic torque of generator, guarantee generator connecting in parallel with system operation, finally realize low voltage crossing.Energy distribution principle is that the control of variable displacement motor pivot angle is preferential, guaranteeing under the prerequisite of wind wheel energy storage limit, excess energy in system is stored into wind wheel, wind speed is predicted simultaneously, for wind speed round promotes reserved energy space, finally set wind wheel energy storage value, proportional throttle valve effect in the time that wind wheel storage power reaches set point, is heat energy by remaining Conversion of Energy in system.
Owing to adopting technique scheme, the present invention compared with prior art has following beneficial effect:
1) there are two controlled variables, both coordinate mutually, control more flexibly, have avoided the limitation of single control object, be convenient to realize power control and rotating speed control in low voltage crossing process simultaneously, guarantee rapidity and reliability in low voltage crossing control procedure;
2) propose two control variables control method for coordinating and energy distribution scheme, be convenient to the distribution of energy in the concrete coordination control of two controlled volumes and control procedure;
3) in hydraulic low voltage cross-over of wind generator set control system, increase proportional throttle valve, whole system response is accelerated, the many adjustable parameters of simultaneity factor, make to control more flexible.
Accompanying drawing explanation
Fig. 1 represents hydraulic principle of the present invention and hardware configuration system figure;
Fig. 2 represents control system schematic diagram of the present invention;
Fig. 3 represents control program figure of the present invention;
Fig. 4 represents Conversion of Energy figure of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail:
A kind of hydraulic low voltage traversing control method of wind generator set, realize the hydraulic system of this control method as shown in Figure 1, its hardware configuration comprises wind wheel 1, the first torque and speed sensors 2, constant displacement pump 3, pressure duct 4, the first unidirectional valve 5, the first pressure sensor 6, proportional throttle valve 7, the second pressure sensor 8, flow sensor 9, safety valve 10, variable displacement motor 11, the second torque and speed sensors 12, generator 13, multifunction instrument 14, electrical network 15, slippage pump 16, overflow valve 17, fuel tank 18, the second unidirectional valve 19, low pressure line 20, air velocity transducer 21, power controller 22, rotational speed governor 23,
In the time that line voltage falls, by above-mentioned hydraulic system and hardware configuration, adjust variable displacement motor 11 pivot angles and proportional throttle valve 7 opening degrees, the excess energy in system is stored into wind wheel 1 with kinetic energy form on the one hand, be converted into heat energy by throttling on the one hand, to realize low voltage crossing.
It shown in Fig. 2, is control system schematic diagram of the present invention.It is hydraulic energy by wind energy transformation that wind mill wind wheel 1 drives constant displacement pump 3 under wind-force effect, controls and is delivered to variable displacement motor 11 through proportional throttle valve 7, with the direct-connected generator 13 of variable displacement motor 11, electric energy is inputted to electrical network 15.Concrete control procedure is as follows:
In the time that wind wheel 1 storage power reaches set point, power controller 22 control ratio choke valves 7: first power controller 22 gathers wind speed by air velocity transducer 21, the first torque and speed sensors 2 gathers wind wheel 1 rotating speed, the first pressure sensor 6 gathers that pressure before throttling, the second pressure sensor 8 gather pressure after throttling, multifunction instrument 14 gathers generator 13 power, then power sensor 22 is exported control signal, control ratio choke valve 7 apertures, are converted into heat energy by system excess energy.
Shown in Fig. 3, be control program figure of the present invention.In the time that line voltage falls, first rotational speed governor 23 control variables motor 11 pivot angles: rotational speed governor 23 gathers generator 13 rotating speeds by the second fast torque sensor 12, flow sensor 9 gathers flow after throttling, multifunction instrument 14 gathers mains frequency, then rotational speed governor 23 is exported control signal, realize variable displacement motor 11 pivot angle controls, increase the discharge capacity of variable displacement motor 11, the high-pressure of hydraulic system is reduced rapidly, thereby the rotating speed that increases constant displacement pump 3, stores dump power into wind wheel 1 with this.
Further in the time that wind wheel 1 storage power reaches set point, power controller 22 control ratio choke valves 7: first power controller 22 gathers wind speed by air velocity transducer 21, the first torque and speed sensors 2 gathers wind wheel 1 rotating speed, the first pressure sensor 6 gathers that pressure before throttling, the second pressure sensor 8 gather pressure after throttling, multifunction instrument 14 gathers generator 13 power, then power sensor 22 is exported control signal, control ratio choke valve 7 apertures, are converted into heat energy by system excess energy.
The Collaborative Control of passing ratio choke valve 7 and variable displacement motor 11 pivot angles, final realization controlled hydraulic system and generator 13 transient responses, and excess energy in system is implemented to reasonable distribution, thereby realizes low voltage crossing.
Shown in Fig. 4, be Conversion of Energy figure of the present invention.In the time that line voltage falls, the electromagnetic power that generator 13 is exported declines, and variable displacement motor 11 power outputs remain unchanged, now variable displacement motor 11 and the instantaneous raising of generator 13 rotating speed, produce dump energy, if do not controlled, each parameter all can reach secure setting and cause the operation of wind turbine generator off-grid.Adoption rate choke valve 7 of the present invention is realized low voltage crossing with the dual control device of variable displacement motor 11 pivot angle.On the one hand, proportional throttle valve 7 acts on dump energy is converted into throttling loss; On the one hand, adjust variable displacement motor 11 pivot angles, increase the discharge capacity of variable displacement motor 11, the high-pressure of hydraulic system is reduced rapidly, thereby the rotating speed that increases constant displacement pump 3, stores dump power into wind wheel 1 with this, make wind wheel 1 accelerate rotation and reach the object that dump power is stored in to wind wheel 1.The active power of final reduction system output, suppresses rotating speed of target fluctuation, makes generator 13 be stabilized in synchronous speed.When line voltage return to rated voltage 90% time, again regulate proportional throttle valve 7 and variable displacement motor 11 pivot angles, realize generator 13 generated outputs 10%/s rated power speed go up, complete LVRT Capability of Wind Turbine Generator function.
Protection scope of the present invention is defined by the claims.Those skilled in the art can, in essence of the present invention and protection range, make various modifications or be equal to replacement the present invention, this modification or be equal to replacement and also should be considered as dropping in protection scope of the present invention.
Claims (1)
1. a hydraulic low voltage traversing control method of wind generator set, the hydraulic system hardware configuration that realizes this control method comprises wind wheel (1), the first torque and speed sensors (2), constant displacement pump (3), pressure duct (4), the first unidirectional valve (5), the first pressure sensor (6), proportional throttle valve (7), the second pressure sensor (8), flow sensor (9), safety valve (10), variable displacement motor (11), the second torque and speed sensors (12), generator (13), multifunction instrument (14), electrical network (15), slippage pump (16), overflow valve (17), fuel tank (18), the second unidirectional valve (19), low pressure line (20), air velocity transducer (21) power controller (22), element and the devices such as rotational speed governor (23),
Wind wheel (1) is directly coaxially connected with constant displacement pump (3), and on connecting axle, arrange the first torque and speed sensors (2), and air velocity transducer (21) is installed near wind wheel; Constant displacement pump (3) oil-in is from low pressure line (20) oil suction, force feed mouth is by pressure duct (4) output hydraulic oil, pressure duct (4) upper series connection proportional throttle valve (7), and arrange respectively the first pressure sensor (6), the second pressure sensor (8) and flow sensor (9) on the pressure duct (4) before and after proportional throttle valve (7); Safety valve (10) is connected across between pressure duct (4) and low pressure line (20), prevents pressure duct (4) overload; Variable displacement motor (11) inlet port is connected with pressure duct (4), its oil drain out is connected with low pressure line (20), variable displacement motor (11) Driven by Coaxial generator (13) generating, input electric energy is to electrical network (15), on variable displacement motor (11) and generator (13) connecting axle, the second torque and speed sensors (12) is installed, and between electrical network (15) and generator (13), multifunction instrument (14) is installed; Slippage pump (16) inlet port is connected with fuel tank (18), its force feed mouth connects respectively the first unidirectional valve (5) and the second unidirectional valve (19), and then be system repairing by high-low pressure pipeline, overflow valve (17) is connected across between slippage pump force feed mouth and fuel tank (18), for setting slippage pump outlet pressure; Power controller (22) input connects torque sensor (2), the first pressure sensor (6), the second pressure sensor (8), multifunction instrument (14) and air velocity transducer (21), and its output connects proportional throttle valve (7); Rotational speed governor (23) input connection traffic transducer (9), the second torque and speed sensors (12) and multifunction instrument (14), its output link variable motor (11);
It is characterized in that: this control method comprises following content:
In the time that line voltage falls, first rotational speed governor (23) control variables motor (11) pivot angle: rotational speed governor (23) gathers generator speed by the second fast torque sensor (12), flow after flow sensor (9) collection throttling, multifunction instrument (14) gathers mains frequency, then rotational speed governor (23) output control signal, realize variable displacement motor (11) pivot angle control, increase the discharge capacity of variable displacement motor (11), the high-pressure of hydraulic system is reduced rapidly, thereby increase the rotating speed of constant displacement pump (3), store dump power into wind wheel with this,
In the time that wind wheel storage power reaches set point, power controller control (22) proportional throttle valve (7): first power controller (22) gathers wind speed by air velocity transducer (21), the first torque and speed sensors (2) gathers wind speed round, before the first pressure sensor (6) collection throttling, after pressure, the second pressure sensor (8) collection throttling, pressure, multifunction instrument (14) gather generator power, then power sensor (22) output control signal, control ratio throttle valve opening, is converted into heat energy by system excess energy;
The Collaborative Control of passing ratio choke valve and variable displacement motor pivot angle, final realization controlled hydraulic system and generator transient response, and excess energy in system is implemented to reasonable distribution, thereby realizes low voltage crossing.
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104234939A (en) * | 2014-08-26 | 2014-12-24 | 燕山大学 | Energy-storing type hydraulic wind generating set |
| CN104362669A (en) * | 2014-10-17 | 2015-02-18 | 燕山大学 | Low-voltage ride through control system and method for hydraulic wind-driven power generator set |
| CN104901332A (en) * | 2015-05-05 | 2015-09-09 | 燕山大学 | Low voltage ride through control system and control method based on variable pitch |
| CN105889164A (en) * | 2016-04-29 | 2016-08-24 | 燕山大学 | Hydraulic floor type rapid liquid filling system of wind generating set and control method for hydraulic floor type rapid liquid filling system |
| CN105927471A (en) * | 2016-04-20 | 2016-09-07 | 燕山大学 | Low-wind-speed start control system and low-wind-speed start control method for hydraulic wind turbine generator system |
| CN106121905A (en) * | 2016-08-19 | 2016-11-16 | 湖北三江航天万山特种车辆有限公司 | A kind of vehicle-mounted hydraulic TRT |
| CN106374526A (en) * | 2016-09-14 | 2017-02-01 | 燕山大学 | Hydraulic wind power generation set and energy layered-controlled low-voltage ride through control method |
| CN108167132A (en) * | 2017-12-01 | 2018-06-15 | 北京金风科创风电设备有限公司 | Hydraulic variable-pitch low-voltage ride-through simulation system and test method |
| CN110195677A (en) * | 2019-05-21 | 2019-09-03 | 西安交通大学 | A kind of parallel distributed energy by ocean current hydraulic drive generator group and its control method |
| CN110966138A (en) * | 2019-11-19 | 2020-04-07 | 天津捷强动力装备股份有限公司 | Safe and energy-saving hydraulic power generation system |
| CN111541282A (en) * | 2020-05-13 | 2020-08-14 | 中国电力工程顾问集团华东电力设计院有限公司 | Low voltage ride through method and device for water supply pump steam turbine power generation system |
| CN111997837A (en) * | 2020-08-17 | 2020-11-27 | 燕山大学 | Hydraulic wind turbine generator power active control system and active control method thereof |
| CN113638842A (en) * | 2021-08-11 | 2021-11-12 | 南京工程学院 | High voltage ride through control system and control method of energy storage type hydraulic wind turbine generator |
| EP4067702A1 (en) * | 2021-04-03 | 2022-10-05 | Hydac Fluidtechnik GmbH | Device |
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| CN104234939A (en) * | 2014-08-26 | 2014-12-24 | 燕山大学 | Energy-storing type hydraulic wind generating set |
| CN104362669A (en) * | 2014-10-17 | 2015-02-18 | 燕山大学 | Low-voltage ride through control system and method for hydraulic wind-driven power generator set |
| CN104901332B (en) * | 2015-05-05 | 2017-03-01 | 燕山大学 | A kind of control method of the low voltage ride through control system based on feather |
| CN104901332A (en) * | 2015-05-05 | 2015-09-09 | 燕山大学 | Low voltage ride through control system and control method based on variable pitch |
| CN105927471A (en) * | 2016-04-20 | 2016-09-07 | 燕山大学 | Low-wind-speed start control system and low-wind-speed start control method for hydraulic wind turbine generator system |
| CN105889164B (en) * | 2016-04-29 | 2017-11-24 | 燕山大学 | A kind of quick hydromechanical system of hydraulic console mode wind power generating set and control method |
| CN105889164A (en) * | 2016-04-29 | 2016-08-24 | 燕山大学 | Hydraulic floor type rapid liquid filling system of wind generating set and control method for hydraulic floor type rapid liquid filling system |
| CN106121905A (en) * | 2016-08-19 | 2016-11-16 | 湖北三江航天万山特种车辆有限公司 | A kind of vehicle-mounted hydraulic TRT |
| CN106374526A (en) * | 2016-09-14 | 2017-02-01 | 燕山大学 | Hydraulic wind power generation set and energy layered-controlled low-voltage ride through control method |
| CN108167132A (en) * | 2017-12-01 | 2018-06-15 | 北京金风科创风电设备有限公司 | Hydraulic variable-pitch low-voltage ride-through simulation system and test method |
| CN108167132B (en) * | 2017-12-01 | 2019-07-26 | 北京金风科创风电设备有限公司 | Hydraulic variable-pitch low-voltage ride-through simulation system and test method |
| CN110195677A (en) * | 2019-05-21 | 2019-09-03 | 西安交通大学 | A kind of parallel distributed energy by ocean current hydraulic drive generator group and its control method |
| CN110966138A (en) * | 2019-11-19 | 2020-04-07 | 天津捷强动力装备股份有限公司 | Safe and energy-saving hydraulic power generation system |
| CN110966138B (en) * | 2019-11-19 | 2021-10-22 | 天津捷强动力装备股份有限公司 | Safe and energy-saving hydraulic power generation system |
| CN111541282A (en) * | 2020-05-13 | 2020-08-14 | 中国电力工程顾问集团华东电力设计院有限公司 | Low voltage ride through method and device for water supply pump steam turbine power generation system |
| CN111997837A (en) * | 2020-08-17 | 2020-11-27 | 燕山大学 | Hydraulic wind turbine generator power active control system and active control method thereof |
| EP4067702A1 (en) * | 2021-04-03 | 2022-10-05 | Hydac Fluidtechnik GmbH | Device |
| CN113638842A (en) * | 2021-08-11 | 2021-11-12 | 南京工程学院 | High voltage ride through control system and control method of energy storage type hydraulic wind turbine generator |
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