CN104901332A - Low voltage ride through control system and control method based on variable pitch - Google Patents
Low voltage ride through control system and control method based on variable pitch Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
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- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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Abstract
The invention discloses a low voltage ride through control system and control method based on a variable pitch. According to the system, a wind turbine part comprises an air velocity transducer, a wind wheel and a variable pitch system; a generator part comprises a generator, a multifunctional instrument and a power grid; and a hydraulic transmission part comprises a first rotating speed and torque transducer, a quantifying pump, a high pressure pipeline, a first one-way valve, a second one-way valve, a second overflow valve, an oil supplementing pump, an oil supplementing tank, a safety valve, a flow transducer, a rotating speed controller, a variable motor, a power controller, a second rotating speed and torque transducer and a low pressure pipeline. According to the control method, when the voltage of the power grid drops due to a fault of the power grid, the input of system energy is reduced from an energy source; and the principle of coordinating energy lies in that the swing angle control of the variable motor is preferential, remaining energy in the system is stored in the wind wheel, meanwhile, the opening degree of a proportional directional valve of the variable pitch system is controlled, the swing angle of the hydraulic motor is changed, then the pitch angle of blades is changed, and the input of system energy is changed.
Description
Technical field
The invention belongs to technical field of wind power generation, relate to main transmission and the pitch-variable system of hydraulic wind turbine generator, traditional drive system is replaced, particularly a kind of low voltage ride through control system based on variable pitch and and control method by hydraulic transmission equipment and hydraulic control system.
Background technology
Along with increasingly sharpening of environment and energy problem, wind power generation more and more receives concern both domestic and external, and therefore wind power generation industry also develops rapidly.
Hydraulic wind turbine generator is as a kind of novel wind power generation plant, adopt constant displacement pump-variable displacement motor Closed circuit hydraulic transmission system, effectively coordinate with excitation synchronous generator, compare with direct-drive aerogenerator group with gear-box type, this unit significantly reduces nacelle weight, decrease the impact to electrical network, improve power generating quality.
The same with other wind-driven generators, hydraulic wind turbine generator needs to possess low voltage ride-through capability equally, namely, when electric network fault or disturbance cause the Voltage Drop of wind farm grid-connected point, in the scope that certain voltage is fallen, Wind turbines 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 proposes 3 requirements to Wind turbines and low voltage crossing process thereof: 1) Wind turbines should have the low voltage ride-through capability that can maintain the 729ms that is incorporated into the power networks when grid-connected point voltage falls to 24% rated voltage; 2), when wind farm grid-connected point voltage can return to 100% of rated voltage after falling in 2s, Wind turbines should have the ability be uninterruptedly incorporated into the power networks; 3) during electric network fault, do not cut out the wind turbine generator of electrical network, its active power should return to the state before fault with the power variation rate of at least 11% rated power/second after failure removal.
At present, all there is relevant patented technology both at home and abroad, reflect a series of achievements in research that hydraulic low voltage cross-over of wind generator set control technology is carried out.
Record ChapDrive company of Norway in European patent EP 28921210A1A and propose a kind of hydraulic low voltage cross-over of wind generator set control system.This system realizes low voltage crossing by control variables motor pivot angle and flow control valve opening.Therefore there are variable displacement motor pivot angle and flow control valve opening two control variables in the method, control more flexible, but the method is heat by unnecessary Conversion of Energy, there is certain energy loss, fundamentally do not regulate and control unit energy, long-time energy loss can cause damage to whole equipment.
Record University On The Mountain Of Swallows in Chinese patent CN1148810984A and propose a kind of bivariant hydraulic low voltage traversing control method of wind generator set.When grid voltage sags, the method is by rotational speed governor control variables motor pivot angle, and power controller control ratio throttle valve opening, finally realizes low voltage crossing.There are variable displacement motor pivot angle and proportional throttle valve two control variables equally in the method, control flexibly, but the method is still and excess energy is converted into heat energy, fundamentally do not reduce the input of energy, damage can be caused for a long time to whole equipment, simultaneously owing to having installed choke valve on pressure duct, there is certain energy loss.
Record University On The Mountain Of Swallows in Chinese patent CN11547210710A and propose a kind of hydraulic low voltage cross-over of wind generator set control system and method, this system realizes low voltage crossing by variable displacement motor pivot angle and pump-motor pivot angle Two Variables.The method implements reasonable distribution and storage to hydraulic system dump energy, but from source, energy is not carried out real-time monitoring.
In sum, energy can not be carried out real-time monitoring by existing hydraulic low voltage traversing control method of wind generator set mostly in control procedure root.For overcoming the technological deficiency of above-mentioned existence, needing badly and a kind of novel hydraulic low voltage traversing control method of wind generator set is provided.
Summary of the invention
For the technological deficiency of above-mentioned existence, problem to be solved by this invention is to provide a kind of hydraulic low voltage cross-over of wind generator set control system based on variable pitch and control method thereof, causes controlling unit during grid voltage sags for electrical grid failure.This control method possesses the ensuring smooth transmission of conventional hydraulic type wind turbine generator, advantage that reliability is high, accurately can realize the real-time change oar of blower fan in low voltage crossing process to control, from source, unit energy is regulated and controled, solve the energy residual problem existed in low voltage crossing process.
In order to the technical problem solving above-mentioned existence realizes goal of the invention, the present invention is achieved by the following technical solutions:
A kind of low voltage ride through control system based on variable pitch, this system forms primarily of three parts: wind energy conversion system part, hydraulic drive part and power generation part, wind energy conversion system part is connected with hydraulic drive part coaxial rigid, and hydraulic drive part is connected with power generation part coaxial rigid;
Described wind energy conversion system part mainly comprises air velocity transducer 1, wind wheel 2 and pitch-variable system;
Described pitch-variable system comprises angular displacement sensor 22, ring gear 23, pinion 24, hydraulic motor 25, proportional direction valve 26, first overflow valve 27, variable pump 28 and the first fuel tank 29, wherein the inlet port of variable pump 28 is from the first fuel tank 29 oil suction, the force feed mouth of variable pump 28 connects the oil-in of the first overflow valve 27 and the P mouth of proportional direction valve 26 respectively, proportional direction valve 26 two hydraulic fluid ports of oil-out A and B respectively connecting fluid pressure motor 25, proportional direction valve 26 is connected with power controller 17, and export control signal by the latter, the valve port opening of control ratio direction valve 26, hydraulic motor 25 is coaxially connected with pinion 24, pinion 24 engages with ring gear 23, the wheel hub of ring gear 23 and wind wheel 2 forms bearing jointly, wind wheel 2 blade is arranged on ring gear 23 by bolt, the wheel hub of wind wheel 2 is installed two panels blade, and pinion 24 and angular displacement sensor 22 are arranged on the steel plate the same face with wheel hub consolidation,
Described power generation part comprises generator 19, multifunction instrument 20 and electrical network 21;
Described hydraulic drive part comprises the first torque and speed sensors 4, constant displacement pump 5, pressure duct 6, first unidirectional valve 7, second unidirectional valve 8, second overflow valve 9, slippage pump 10, repairing fuel tank 11, safety valve 12, flow sensor 13, rotational speed governor 14, variable displacement motor 15, power controller 17, second torque and speed sensors 16 and low pressure line 30;
Install air velocity transducer 1 near wind wheel 2, wind wheel 2 is coaxially connected with constant displacement pump 5 main shaft by the first power transmission shaft 3; First torque and speed sensors 4 is arranged on the power transmission shaft 3 of connection wind wheel 2 and constant displacement pump 5 main shaft; The oil-in of constant displacement pump 5 is from low pressure line 30 oil suction, and the force feed mouth of constant displacement pump 5 exports hydraulic oil by pressure duct 6, and arranges flow sensor 13 on pressure duct 6; Safety valve 12 is connected across between pressure duct 6 and low pressure line 30; The inlet port of variable displacement motor 15 is connected with pressure duct 6, and the oil drain out of variable displacement motor 15 is connected with low pressure line 30; The main shaft of variable displacement motor 15 coaxially connects the main shaft of generator 19 by second driving shaft 18, variable displacement motor 15 Driven by Coaxial generator 19 generates electricity, and input electric energy, to electrical network 21, is provided with multifunction instrument 20 between generator 19 and electrical network 21; Second torque and speed sensors 16 is arranged on the second driving shaft 18 of link variable motor 15 main shaft and generator 19 main shaft; Slippage pump 10 inlet port is connected with repairing fuel tank 11, and slippage pump 10 force feed mouth connects one end of the first unidirectional valve 7 and the second unidirectional valve 8 respectively, and the other end of the first unidirectional valve 7 is connected to pressure duct 6, and the other end of the second unidirectional valve 8 is connected to low pressure line 30; Second overflow valve 9 is connected across between slippage pump 10 force feed mouth and repairing fuel tank 11; Power controller 17 input connects the angular displacement sensor 22 of the first torque and speed sensors 4, second torque and speed sensors 16, multifunction instrument 20, air velocity transducer 1 and pitch-variable system respectively; Power controller 17 output connects the proportional direction valve 26 of pitch-variable system; Rotational speed governor 14 input is connection traffic transducer 13, second torque and speed sensors 16 and multifunction instrument 20 respectively, rotational speed governor 14 output link variable motor 15.
The control method of described a kind of low voltage ride through control system based on variable pitch, when electrical grid failure causes grid voltage sags, the input of system capacity is reduced from energy root, the principle coordinating energy is that variable displacement motor swinging angle control is preferential, dump energy in system is stored into wind wheel, controls the valve port opening of pitch-variable system proportional direction valve simultaneously, change the pivot angle of hydraulic motor, and then change the propeller pitch angle of blade, change the input of system capacity.Its concrete steps comprise following content:
When electrical network 21 Voltage Drop, because low-voltage process is extremely of short duration, therefore first by rotational speed governor 14 control variables motor 15 pivot angle: rotational speed governor 14 gathers the rotating speed of variable displacement motor 15 by the second torque and speed sensors 16, flow sensor 13 gathers the flow of pressure duct 6, and multifunction instrument 20 gathers electrical network 21 frequency and voltage, then rotational speed governor 14 exports control signal to variable displacement motor 15, realize variable displacement motor 15 swinging angle control, increase the discharge capacity of variable displacement motor 15, the oil pressure of the hydraulic oil in hydraulic drive partial high pressure pipeline 6 is reduced rapidly, thus increase the rotating speed of constant displacement pump 5, with this, dump energy is converted into the kinetic energy of wind wheel 2, this control procedure ensures electrical network 21 not off-grid, system speed stabilizing is exported, ensure that unit normally runs, control pitch-variable system running by power controller 17: first simultaneously, power controller 17 gathers wind speed by air velocity transducer 1, first torque and speed sensors 4 gathers wind speed round, gather generator 19 power output and line voltage by multifunction instrument 20, gathered the propeller pitch angle of wind wheel 2 blade by angular displacement sensor 22, then, power controller 17 exports control signal to the proportional direction valve 26 of pitch-variable system, the valve port opening of proportional direction valve 26 is reduced, and then the flow entering hydraulic motor 25 is reduced, hydraulic motor 25 is connected with pinion 24 coaxial rigid, and pinion 24 engages with ring gear 23, because this reducing the propeller pitch angle of wind wheel 2 blade, thus reduce the energy input of whole system, remaining energy is eliminated simultaneously,
When after failure removal, power controller 17 controls pitch-variable system running: first, power controller 17 gathers wind speed by air velocity transducer 1, first torque and speed sensors 4 gathers wind wheel 2 rotating speed, gather generator 19 power output and electrical network 21 voltage by multifunction instrument 20, angular displacement sensor 22 gathers the blade pitch angle of wind wheel 2; Then, power controller 17 exports control signal to pitch-variable system proportional direction valve 26, the valve port opening of proportional direction valve 26 is increased, and then the flow entering hydraulic motor 25 is increased, hydraulic motor 25 is connected with pinion 24 coaxial rigid, pinion 24 engages with ring gear 23, therefore the propeller pitch angle of wind wheel 2 blade is increased, thus increase the energy input of whole system, make generator 19 active power inject electrical network 21 with the power variation rate of at least 11% rated power/second, support electrical network 21 returns to the state before fault.
Owing to adopting technique scheme, the present invention compared with prior art has following beneficial effect:
1, the present invention has two control variables, be respectively the valve port opening of the proportional direction valve of pitch-variable system and the variable displacement motor pivot angle of constant displacement pump-variable displacement motor drive system, both coordinate mutually, low voltage crossing are controlled more flexible, guarantee the rapidity in control procedure and reliability simultaneously;
2, the present invention is in low voltage crossing process, and pitch-variable system can carry out real-time monitoring to the energy inputted in system, solves the problem of system spare energy, avoids unnecessary energy and there is damage to system for a long time.
The present invention can the problem of resolution system dump energy by pitch-variable system, coordinates energy, efficiently avoid the problem of dump energy process in low voltage crossing process from root.
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 the structural representation of pitch-variable system of the present invention;
Fig. 4 represents workflow diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail: a kind of low voltage ride through control system based on variable pitch, its hydraulic principle and hardware configuration system figure and control system principle are as shown in Figure 1 and Figure 2, this system forms primarily of three parts: wind energy conversion system part, hydraulic drive part and power generation part, wind energy conversion system part is connected with hydraulic drive part coaxial rigid, and hydraulic drive part is connected with power generation part coaxial rigid;
Described wind energy conversion system part mainly comprises air velocity transducer 1, wind wheel 2 and pitch-variable system;
Described pitch-variable system, as shown in Figure 3, it comprises angular displacement sensor 22, ring gear 23, pinion 24, hydraulic motor 25, proportional direction valve 26, first overflow valve 27, variable pump 28 and the first fuel tank 29 to its structural representation, wherein the inlet port of variable pump 28 is from the first fuel tank 29 oil suction, the force feed mouth of variable pump 28 connects the oil-in of the first overflow valve 27 and the P mouth of proportional direction valve 26 respectively, proportional direction valve 26 two hydraulic fluid ports of oil-out A and B respectively connecting fluid pressure motor 25, proportional direction valve 26 is connected with power controller 17, and export control signal by the latter, the valve port opening of control ratio direction valve 26, hydraulic motor 25 is coaxially connected with pinion 24, pinion 24 engages with ring gear 23, the wheel hub of ring gear 23 and wind wheel 2 forms bearing jointly, wind wheel 2 blade is arranged on ring gear 23 by bolt, the wheel hub of wind wheel 2 is installed two panels blade, and pinion 24 and angular displacement sensor 22 are arranged on the steel plate the same face with wheel hub consolidation,
Described power generation part comprises generator 19, multifunction instrument 20 and electrical network 21;
Described hydraulic drive part comprises the first torque and speed sensors 4, constant displacement pump 5, pressure duct 6, first unidirectional valve 7, second unidirectional valve 8, second overflow valve 9, slippage pump 10, repairing fuel tank 11, safety valve 12, flow sensor 13, rotational speed governor 14, variable displacement motor 15, power controller 17, second torque and speed sensors 16 and low pressure line 30;
Install air velocity transducer 1 near wind wheel 2, wind wheel 2 is coaxially connected with constant displacement pump 5 main shaft by the first power transmission shaft 3; First torque and speed sensors 4 is arranged on the power transmission shaft 3 of connection wind wheel 2 and constant displacement pump 5 main shaft; The oil-in of constant displacement pump 5 is from low pressure line 30 oil suction, and the force feed mouth of constant displacement pump 5 exports hydraulic oil by pressure duct 6, and arranges flow sensor 13 on pressure duct 6; Safety valve 12 is connected across between pressure duct 6 and low pressure line 30; The inlet port of variable displacement motor 15 is connected with pressure duct 6, and the oil drain out of variable displacement motor 15 is connected with low pressure line 30; The main shaft of variable displacement motor 15 coaxially connects the main shaft of generator 19 by second driving shaft 18, variable displacement motor 15 Driven by Coaxial generator 19 generates electricity, and input electric energy, to electrical network 21, is provided with multifunction instrument 20 between generator 19 and electrical network 21; Second torque and speed sensors 16 is arranged on the second driving shaft 18 of link variable motor 15 main shaft and generator 19 main shaft; Slippage pump 10 inlet port is connected with repairing fuel tank 11, and slippage pump 10 force feed mouth connects one end of the first unidirectional valve 7 and the second unidirectional valve 8 respectively, and the other end of the first unidirectional valve 7 is connected to pressure duct 6, and the other end of the second unidirectional valve 8 is connected to low pressure line 30; Second overflow valve 9 is connected across between slippage pump 10 force feed mouth and repairing fuel tank 11; Power controller 17 input connects the angular displacement sensor 22 of the first torque and speed sensors 4, second torque and speed sensors 16, multifunction instrument 20, air velocity transducer 1 and pitch-variable system respectively; Power controller 17 output connects the proportional direction valve 26 of pitch-variable system; Rotational speed governor 14 input is connection traffic transducer 13, second torque and speed sensors 16 and multifunction instrument 20 respectively, rotational speed governor 14 output link variable motor 15.
The control method of described a kind of low voltage ride through control system based on variable pitch, the method comprises following content:
When electrical network 21 Voltage Drop, because low-voltage process is extremely of short duration, therefore first by rotational speed governor 14 control variables motor 15 pivot angle: rotational speed governor 14 gathers the rotating speed of variable displacement motor 15 by the second torque and speed sensors 16, flow sensor 13 gathers the flow of pressure duct 6, and multifunction instrument 20 gathers electrical network 21 frequency and voltage, then rotational speed governor 14 exports control signal to variable displacement motor 15, realize variable displacement motor 15 swinging angle control, increase the discharge capacity of variable displacement motor 15, the oil pressure of the hydraulic oil in hydraulic drive partial high pressure pipeline 6 is reduced rapidly, thus increase the rotating speed of constant displacement pump 5, with this, dump energy is converted into the kinetic energy of wind wheel 2, this control procedure ensures electrical network 21 not off-grid, system speed stabilizing is exported, ensure that unit normally runs, control pitch-variable system running by power controller 17: first simultaneously, power controller 17 gathers wind speed by air velocity transducer 1, first torque and speed sensors 4 gathers wind speed round, gather generator 19 power output and line voltage by multifunction instrument 20, gathered the propeller pitch angle of wind wheel 2 blade by angular displacement sensor 22, then, power controller 17 exports control signal to the proportional direction valve 26 of pitch-variable system, the valve port opening of proportional direction valve 26 is reduced, and then the flow entering hydraulic motor 25 is reduced, hydraulic motor 25 is connected with pinion 24 coaxial rigid, and pinion 24 engages with ring gear 23, because this reducing the propeller pitch angle of wind wheel 2 blade, thus reduce the energy input of whole system, remaining energy is eliminated simultaneously,
When after failure removal, power controller 17 controls pitch-variable system running: first, power controller 17 gathers wind speed by air velocity transducer 1, first torque and speed sensors 4 gathers wind wheel 2 rotating speed, gather generator 19 power output and electrical network 21 voltage by multifunction instrument 20, angular displacement sensor 22 gathers the blade pitch angle of wind wheel 2; Then, power controller 17 exports control signal to pitch-variable system proportional direction valve 26, the valve port opening of proportional direction valve 26 is increased, and then the flow entering hydraulic motor 25 is increased, hydraulic motor 25 is connected with pinion 24 coaxial rigid, pinion 24 engages with ring gear 23, therefore the propeller pitch angle of wind wheel 2 blade is increased, thus increase the energy input of whole system, make generator 19 active power inject electrical network 21 with the power variation rate of at least 11% rated power/second, support electrical network 21 returns to the state before fault.
The present invention comprises constant displacement pump-variable displacement motor speed control system and variable-pitch control system, and has two controllable variable: the variable displacement motor pivot angle of the hydraulic motor pivot angle of pitch-variable system and constant displacement pump-variable displacement motor drive system.
The workflow diagram of kind of the present invention based on the control method of the low voltage ride through control system of variable pitch shown in Fig. 4.First, rotational speed governor 14 and power controller 17 are by multifunction instrument 20 monitoring line voltage state in real time, when detecting that any phase voltage of electrical network 21 falls make electrical network 21 voltage lower than rated voltage 100%, dump energy is stored into wind wheel 2 by rotational speed governor 14 control variables motor 15 pivot angle, when wind wheel 2 stored energy reaches set point, the valve port opening that power controller 17 controls the proportional direction valve 26 of pitch-variable system reduces, and then the propeller pitch angle of the blade of reduction wind wheel 2, reduce the input of whole system energy.
Secondly, power controller 17 detect any phase of three phase network by multifunction instrument 20 voltage whether in 2s all higher than 100% of electrical network rated voltage.If, the valve port opening of scaling up direction valve 26, increase the flow entering hydraulic motor 25, the pivot angle of the hydraulic motor 25 of pitch-variable system increases, and then the propeller pitch angle of the blade of increase wind wheel 2, make generator 19 active power inject electrical network with the power variation rate of at least 11% rated power/second, support the state before power system restoration to fault, complete low voltage crossing; Otherwise do not terminate in low voltage crossing 2s, illustrate that now electrical network 21 there occurs the fault cannot repaired in the short time, wind turbine generator cuts out electrical network.
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, and make various amendment or equivalent replacement to the present invention, this amendment or equivalent replacement also should be considered as dropping in protection scope of the present invention.
Claims (2)
1. the low voltage ride through control system based on variable pitch, it is characterized in that: this system forms primarily of three parts: wind energy conversion system part, hydraulic drive part and power generation part, wind energy conversion system part is connected with hydraulic drive part coaxial rigid, and hydraulic drive part is connected with power generation part coaxial rigid;
Described wind energy conversion system part mainly comprises air velocity transducer (1), wind wheel (2) and pitch-variable system;
Described pitch-variable system comprises angular displacement sensor (22), ring gear (23), pinion (24), hydraulic motor (25), proportional direction valve (26), the first overflow valve (27), variable pump (28) and the first fuel tank (29), wherein the inlet port of variable pump (28) is from the first fuel tank (29) oil suction, the force feed mouth of variable pump (28) connects the oil-in of the first overflow valve (27) and the P mouth of proportional direction valve (26) respectively, two hydraulic fluid ports of oil-out A and B difference connecting fluid pressure motor (25) of (26) of proportional direction valve, proportional direction valve (26) is connected with power controller (17), and export control signal by the latter, the valve port opening of control ratio direction valve (26), hydraulic motor (25) is coaxially connected with pinion (24), pinion (24) engages with ring gear (23), the wheel hub of ring gear (23) and wind wheel (2) forms bearing jointly, wind wheel (2) blade is arranged on ring gear (23) by bolt, two panels blade installed by the wheel hub of wind wheel (2), and pinion (24) and angular displacement sensor (22) are arranged on the steel plate the same face with wheel hub consolidation,
Described power generation part comprises generator (19), multifunction instrument (20) and electrical network (21);
Described hydraulic drive part comprises the first torque and speed sensors (4), constant displacement pump (5), pressure duct (6), first unidirectional valve (7), second unidirectional valve (8), second overflow valve (9), slippage pump (10), repairing fuel tank (11), safety valve (12), flow sensor (13), rotational speed governor (14), variable displacement motor (15), power controller (17), second torque and speed sensors (16) and low pressure line (30),
Install air velocity transducer (1) near wind wheel (2), wind wheel (2) is coaxially connected with constant displacement pump (5) main shaft by the first power transmission shaft (3); First torque and speed sensors (4) is arranged on the power transmission shaft (3) of connection wind wheel (2) and constant displacement pump (5) main shaft; The oil-in of constant displacement pump (5) is from low pressure line (30) oil suction, the force feed mouth of constant displacement pump (5) exports hydraulic oil by pressure duct (6), and arranges flow sensor (13) on pressure duct (6); Safety valve (12) is connected across between pressure duct (6) and low pressure line (30); The inlet port of variable displacement motor (15) is connected with pressure duct (6), and the oil drain out of variable displacement motor (15) is connected with low pressure line (30); The main shaft of variable displacement motor (15) coaxially connects the main shaft of generator (19) by second driving shaft (18), variable displacement motor (15) Driven by Coaxial generator (19) generates electricity, input electric energy, to electrical network (21), is provided with multifunction instrument (20) between generator (19) and electrical network (21); Second torque and speed sensors (16) is arranged on the second driving shaft (18) of link variable motor (15) main shaft and generator (19) main shaft; Slippage pump (10) inlet port is connected with repairing fuel tank (11), slippage pump (10) force feed mouth connects one end of the first unidirectional valve (7) and the second unidirectional valve (8) respectively, the other end of the first unidirectional valve (7) is connected to pressure duct (6), and the other end of the second unidirectional valve (8) is connected to low pressure line (30); Second overflow valve (9) is connected across between slippage pump (10) force feed mouth and repairing fuel tank (11); Power controller (17) input connects the angular displacement sensor (22) of the first torque and speed sensors (4), the second torque and speed sensors (16), multifunction instrument (20), air velocity transducer (1) and pitch-variable system respectively; Power controller (17) output connects the proportional direction valve (26) of pitch-variable system; Rotational speed governor (14) input is connection traffic transducer (13), the second torque and speed sensors (16) and multifunction instrument (20) respectively, rotational speed governor (14) output link variable motor (15).
2. the control method of a kind of low voltage ride through control system based on variable pitch according to claim 1, is characterized in that the method comprises following content:
When electrical network (21) Voltage Drop, because low-voltage process is extremely of short duration, therefore first by rotational speed governor (14) control variables motor (15) pivot angle: rotational speed governor (14) gathers the rotating speed of variable displacement motor (15) by the second torque and speed sensors (16), flow sensor (13) gathers the flow of pressure duct (6), and multifunction instrument (20) gathers electrical network (21) frequency and voltage, then rotational speed governor (14) exports control signal to variable displacement motor (15), realize variable displacement motor (15) swinging angle control, increase the discharge capacity of variable displacement motor (15), the high-pressure of hydraulic system is reduced rapidly, the oil pressure of the hydraulic oil in hydraulic drive partial high pressure pipeline (6) is reduced rapidly, thus increase the rotating speed of constant displacement pump (5), with this, dump energy is converted into the kinetic energy of wind wheel (2), this control procedure ensures electrical network (21) not off-grid, system speed stabilizing is exported, ensure that unit normally runs, control pitch-variable system running by power controller (17): first simultaneously, power controller (17) gathers wind speed by air velocity transducer (1), first torque and speed sensors (4) gathers wind speed round, gather generator (19) power output and line voltage by multifunction instrument (20), gathered the propeller pitch angle of wind wheel (2) blade by angular displacement sensor (22), then, power controller (17) exports control signal to the proportional direction valve of pitch-variable system (26), the valve port opening of proportional direction valve (26) is reduced, and then the flow entering hydraulic motor (25) is reduced, hydraulic motor (25) is connected with pinion (24) coaxial rigid, pinion (24) engages with ring gear (23), because this reducing the propeller pitch angle of wind wheel (2) blade, thus reduce the energy input of whole system, remaining energy is eliminated simultaneously,
When after failure removal, power controller (17) controls pitch-variable system running: first, power controller (17) gathers wind speed by air velocity transducer (1), first torque and speed sensors (4) gathers wind wheel (2) rotating speed, gather generator (19) power output and electrical network (21) voltage by multifunction instrument (20), angular displacement sensor (22) gathers the blade pitch angle of wind wheel (2), then, power controller (17) exports control signal to pitch-variable system proportional direction valve (26), the valve port opening of proportional direction valve (26) is increased, and then the flow entering hydraulic motor (25) is increased, hydraulic motor (25) is connected with pinion (24) coaxial rigid, pinion (24) engages with ring gear (23), therefore the propeller pitch angle of wind wheel (2) blade is increased, thus increase the energy input of whole system, generator (19) active power is made to inject electrical network (21) with the power variation rate of at least 11% rated power/second, support electrical network (21) returns to the state before fault.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106246463A (en) * | 2016-07-19 | 2016-12-21 | 沈阳华创风能有限公司 | The test system of wind generating set pitch control system and appraisal procedure |
| 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 |
| CN106870289A (en) * | 2017-03-28 | 2017-06-20 | 兰州理工大学 | A kind of hydrostatic storage formula hydraulic drive type wind power generating set and 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 |
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| CN106870289B (en) * | 2017-03-28 | 2023-08-08 | 兰州理工大学 | Hydrostatic energy storage type hydraulic drive wind generating set and control method |
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| 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 |
| CN110805521A (en) * | 2019-11-08 | 2020-02-18 | 燕山大学 | Novel frequency modulation control system and control method for energy storage type hydraulic wind generating set |
| 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 |
| CN112610419A (en) * | 2020-12-16 | 2021-04-06 | 南京工程学院 | Hydraulic wind turbine generator set based on PLC and MSC II control |
| CN112610419B (en) * | 2020-12-16 | 2022-04-29 | 南京工程学院 | Hydraulic wind turbine generator set based on PLC and MSC II control |
| CN113027687A (en) * | 2021-03-09 | 2021-06-25 | 南京工程学院 | Hydraulic wind turbine generator optimal power tracking control system and method |
| CN114920327A (en) * | 2022-05-26 | 2022-08-19 | 南京工程学院 | Control system and method for directly driving seawater to desalt water quality by energy storage type hydraulic fan |
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