CN107781111B - Energy storage type hydraulic wind power generating set primary frequency control system and control method - Google Patents
Energy storage type hydraulic wind power generating set primary frequency control system and control method Download PDFInfo
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- CN107781111B CN107781111B CN201710834781.8A CN201710834781A CN107781111B CN 107781111 B CN107781111 B CN 107781111B CN 201710834781 A CN201710834781 A CN 201710834781A CN 107781111 B CN107781111 B CN 107781111B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D9/00—Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby; Wind motors specially adapted for installation in particular locations
- F03D9/10—Combinations of wind motors with apparatus storing energy
- F03D9/17—Combinations of wind motors with apparatus storing energy storing energy in pressurised fluids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
- F15B1/022—Installations or systems with accumulators used as an emergency power source, e.g. in case of pump failure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B9/00—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member
- F15B9/14—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with rotary servomotors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B9/00—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member
- F15B9/16—Systems essentially having two or more interacting servomotors, e.g. multi-stage
- F15B9/17—Systems essentially having two or more interacting servomotors, e.g. multi-stage with electrical control means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
- F15B2211/2053—Type of pump
- F15B2211/20546—Type of pump variable capacity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/21—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
- F15B2211/212—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being accumulators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/61—Secondary circuits
- F15B2211/613—Feeding circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
-
- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
-
- 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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
Abstract
The invention discloses a kind of energy storage type hydraulic wind power generating set primary frequency control system and control method, the primary frequency control system includes: wind wheel, shaft coupling, constant displacement pump, motor, proportional throttle valve, overflow valve, check valve, hydraulic oil container, variable displacement motor, hydraulic accumulator subsystem and its safe valve group, excitation synchronous generator, grid-connection cabinet, primary frequency modulation controller, pressure sensor, flow sensor, torque and speed sensors and fluid pressure line.The control method is: in unit running process, fluctuating for the transient behavior of mains frequency, realizes the dynamic equilibrium to hydraulic wind power generating set output frequency using hydraulic motor energy storage subsystem.The present invention is in unit running process, and for hydraulic energy-accumulating subsystem compared to the inertia energy storage of wind energy conversion system, the energy of storage is more, bears larger range of mains frequency fluctuation, keeps set grid-connection stable operation to greatest extent.
Description
Technical field
The invention belongs to the field of new energy technologies of wind-power electricity generation, more particularly to energy storage type hydraulic wind power generating set
Primary frequency control system and control method.
Background technique
In recent years under the overall background for greatly developing green energy resource, permeability (the wind power occupied area of China's wind-power electricity generation
The percentage of domain grid power) it is continuously improved, wind-powered electricity generation has become the important component of China's electric system.However climate
The influence of condition, output power of wind power generation have the characteristics that intermittent and randomness.Large-scale wind power generation access is to electric power
Systems organization, operation control, protection, scheduling etc. propose new challenge, especially still deposit in terms of active power controller
It is badly in need of solving in some problems, except large-scale wind power integration can cause relatively high power to fluctuate, is also easy to cause system inertia
Missing, influences system frequency stability.In order to guarantee power system security even running, need to improve the tune of Wind turbines itself
Frequency ability.Therefore each grid-connected directive/guide requires: when the active power given value of wind power plant is lower than its available active power, wind-powered electricity generation
Field provides system frequency deviation certain frequency response；When system frequency is excessively high, active power of wind power field output is reduced；When
When system frequency is too low, increase active power of wind power field output, to improve the frequency stability of system.
The speed-variable frequency-constant wind-driven generator group of existing market mainstream is grid-connected by power electronic equipment, active output and power grid
Frequency fluctuation decoupling needs additional controller to realize that frequency modulation control, frequency regulation capacity confidence level be not high.
Existing primary frequency modulation control method based on the feedback signal and the difference of controller, can be by the double-fed asynchronous wind of mainstream
The additional controller that machine (DFIG) unit participates in primary frequency modulation is divided into inertia control, sagging control (or ratio control), rotor
Hypervelocity control, pitch control and step control etc..Though listed traditional frequency modulation method meets current wind to a certain extent
Electricity participate in frequency modulation demand, but vulnerable to wind regime influence cause mains frequency it is secondary fall, blower frequently adjusts paddle, reduces wind power plant
Power benefit, long-term overspeed reduce wind energy utilization and fan life.
Hydraulic accumulation energy system can provide fast power regulating power for Wind turbines, improve the inertia of unit, effectively press down
The medium, high frequency component of wind power fluctuation processed, participates in Wind turbines frequency and adjusts；Mains frequency fluctuation is reduced, is reduced extensive
The frequency modulation pressure and capacity requirement of power grid when wind-electricity integration.But traditional energy-storage system, no matter it is disposed on Wind turbines level
On, or in wind power plant level, rely only on real power control and frequency modulation demand that energy storage undertakes wind power plant, necessarily will cause energy storage
Big, at high cost, economic benefit the is bad problem of capacity configuration.
Summary of the invention
To solve the problems, such as above-mentioned wind-powered electricity generation frequency-modulating process, in conjunction with the advantages of hydraulic accumulation energy system, mesh of the invention
Be a kind of energy storage type hydraulic wind power generating set primary frequency control system and control method are provided.
The primary frequency control system includes: wind wheel, shaft coupling, constant displacement pump, motor, proportional throttle valve, overflow valve, unidirectional
It is valve, hydraulic oil container, variable displacement motor, hydraulic accumulator subsystem and its safe valve group, excitation synchronous generator, grid-connection cabinet, primary
Frequency modulation control device, pressure sensor, flow sensor, torque and speed sensors and fluid pressure line.The control method is:
In unit running process, fluctuates for the transient behavior of mains frequency, realized using hydraulic motor energy storage subsystem to hydraulic
The dynamic equilibrium of wind power generating set output frequency.
In order to solve above-mentioned technical problem, the present invention is achieved by the following technical solutions:
A kind of energy storage type hydraulic wind power generating set primary frequency control system, including wind wheel 1, anemoclinograph 2, first
Axis device 3, the first torque and speed sensors 4, low speed huge discharge hydraulic pump 5, the first overflow valve 6, check valve 7, the second overflow valve 8,
Hydraulic quantitative slippage pump 9, motor 10, hydraulic oil container 11, flow sensor 12, proportional throttle valve 13,14, first turns of variable displacement motor
Fast sensor 15, the second torque and speed sensors 16, the second speed probe 17, second shaft coupling 3.1, hydraulic pump/motor 18,
Pressure sensor 19, bladder accumulator 20, piston accumulator 21, nitrogen cylinder group 22, third torque and speed sensors 23,
Three shaft couplings 3.2, excitation synchronous generator 24, grid-connection cabinet 25, primary frequency modulation controller 26 and fluid pressure line；
The wind wheel 1 drives low speed huge discharge hydraulic pump 5 to rotate to hydraulic by first shaft coupling 3 under wind energy
Quantitative change motor 14 in type wind power generating set system is for high pressure oil；5 oil outlet of low speed huge discharge hydraulic pump sequential connection first
The oil inlet of overflow valve 6 and the oil inlet of proportional throttle valve 13；Motor 10 is connected with hydraulic quantitative slippage pump 9；Hydraulic quantitative benefit
The oil outlet of oil pump 9 respectively with the oil inlet of check valve 7, the oil inlet of the second overflow valve 8, the first overflow valve 6 oil outlet and
The oil inlet of low speed huge discharge hydraulic pump 5 connects, the oil outlet of the oil inlet of hydraulic quantitative slippage pump 9 and the second overflow valve 8 with
Hydraulic oil container connection；The oil outlet of check valve 7 is connect with the oil inlet of proportional throttle valve 13, and hydraulic oil passes through proportional throttle valve 13
Oil outlet flow to the oil inlet of variable displacement motor 14, variable displacement motor 14 is connected by second shaft coupling 3.1 and hydraulic pump/motor 18
It connects；18 one end of pump/motor is connect with bladder accumulator 20, piston accumulator 21 and nitrogen cylinder group 22, the other end
It is connected by third shaft coupling 3.2 with excitation synchronous generator 24；Excitation synchronous generator 24 is connect with grid-connection cabinet 25；
The wind wheel 1 drives low speed huge discharge hydraulic pump 5 to rotate under wind energy, and oil liquid is all the way through the first overflow valve
6 open when system pressure is excessively high, realize the circulation of oil liquid, and anti-locking system is damaged because of hypertonia；Ratio is flowed through all the way
After example throttle valve 13 drives hydraulic pump/motor 18 to rotate, the oil inlet of low speed huge discharge hydraulic pump 5 is flowed to through oil circuit L2, is formed
Hydraulic closed control loop；Proportional throttle valve 13 exports the tune of revolving speed by adjusting the realization of valve port opening size to variable displacement motor 14
It is whole；Check valve 7, the second overflow valve 8, hydraulic quantitative slippage pump 9 and motor 10 form a hydraulic oil filling system, are replenished in time
The hydraulic oil leaked in hydraulic system, and then keep hydraulic system to continue working, while also can be the hydraulic oil in hydraulic system
Cooling improves Hydraulic Elements working performance；Check valve 7 can prevent hydraulic oil liquid from opposite direction reflux occur, the second overflow valve 8
Effect be also opened when system pressure is excessively high, realize the circulation of oil liquid, can anti-locking system be damaged because of hypertonia；
The hydraulic pump/motor 18 starts turning under the promotion of variable displacement motor 14, and then is pushed away by third shaft coupling 3.2
The power generation of hydraulic wind power generating set is realized in the dynamic rotation of excitation synchronous generator 24, excitation synchronous generator 24 by with it is grid-connected
Cabinet is connected, and among the electricity that unit is issued is connected to the grid, and then completes wind-electricity integration process；Bladder accumulator 20,
Piston accumulator 21 and nitrogen cylinder group 22 and hydraulic pump/motor 18 act on, being capable of or grid collapses larger in wind-force
When causing grid voltage sags, the extra hydraulic energy from wind energy transformation is absorbed, and stored；In wind-force deficiency
When, the hydraulic energy that can discharge storage pushes hydraulic pump/motor 18 to rotate, so that it is guaranteed that the output revolving speed of hydraulic pump/motor 18
It is steady state value, can be realized the primary frequency modulation to hydraulic Wind turbines, while also can be improved the steady of unit institute generation frequency
It is qualitative；
The anemoclinograph 2 is mounted on real-time monitoring wind speed in tower, the first torque and speed sensors 4, the second revolving speed
Torque sensor 16 and third torque and speed sensors 23 are separately mounted to first shaft coupling 3, second shaft coupling 3.1 and third connection
On axis device 3.2, it is respectively used to the rotational speed and torque of monitoring low speed huge discharge hydraulic pump 5, variable displacement motor 14 and hydraulic pump/motor 18；
First speed probe 15, the second speed probe 17 are separately mounted in second shaft coupling 3.1 and third shaft coupling 3.2, point
Not Yong Yu monitored parameters motor 14 and hydraulic pump/motor 18 revolving speed；Flow sensor 12 for monitor proportional throttle valve 13 into
Oil port uninterrupted, all rotational speed and torque signal, tach signal and flow signals monitored feed back to primary frequency modulation control
In device 26 processed, adjustment of the unit to 14 pivot angle of 1 propeller pitch angle of wind wheel and variable displacement motor, cooperation hydraulic accumulation energy subsystem realization pair are realized
The Dynamic Programming of energy storage/discharge in unit, and then realize the stabilization of unit output revolving speed, the stabilization of generation frequency to ensure；
Pressure sensor 19 is used to monitor the real-time dynamic pressure of hydraulic accumulation energy subsystem, and signal is timely feedbacked to primary frequency modulation control
In device 26 processed, to ensure unit work in safer environment.
The control method of the energy storage type hydraulic wind power generating set primary frequency control system, this method content includes following
Step:
When wind energy or mains frequency fluctuate, based on the feedback signal that primary frequency modulation controller 26 receives, pass through
Primary frequency modulation controller 26 issues control signal and controls the hydraulic pump/motor 18 in system, so as to according to liquid
It is used as hydraulic pump or hydraulic motor under different working conditions locating for die mould wind power generating set, to energy storage/discharge in unit
Dynamic Programming, thus realize hydraulic wind power generating set primary frequency modulation control；
When frequency fluctuates in lesser range, above-mentioned control method can satisfy requirement；If when wind-force is very big or
Person is because of frequency fluctuation caused by electric network fault, when required control target is not achieved in above-mentioned control method, in hydraulic storage
The memory capacity of bladder accumulator 20, piston accumulator 21 in energy subsystem and nitrogen cylinder group 22 reaches maximum premise
Under the conditions of, then it can be adjusted by the valve port opening and 14 pivot angle of variable displacement motor of comparative example throttle valve 13, to more in unit
Remaining energy is allocated and dissipates, and extra high-pressure and hydraulic can be dissipated in the form of thermal energy, while adjusting variable displacement motor
14 motor pivot angle makes its work in constant rotational speed value, so that it is guaranteed that the output stabilization of speed of excitation synchronous generator 24 is in constant
Value realizes that unit continues grid-connected and system frequency Primary regulation function.
Compared with prior art, the present invention has the advantage that:
(1) present system Hydraulic Power Transmission System replaces gear-box this variable-speed motor in traditional wind group
Structure so that the volume of unit greatly reduces, and solves the problems, such as that gearbox fault rate is higher from the root；
(2) present system only need by adjust fluid pressure line in hydraulic oil flow, can control variable displacement motor and
The revolving speed of hydraulic pump/motor realizes stepless time adjustment, instead of carrying out limited speed regulation function by gear-box merely in conventional rack
Can, without complicated and expensive converter plant；
(3) present invention realizes the method simple possible the most of variable speed constant frequency control operation, knot by control hydraulic pressure
The reliability that structure is implemented is higher；
(4) hydraulic pump/motor has amphicheirality in present system hydraulic accumulation energy subsystem, in the particular job item of unit
, it can be achieved that the hydraulic energy of storage is discharged under part, also may be implemented for high-pressure and hydraulic extra in unit to be stored in wherein, to
It is discharged when needing, improves the working efficiency and environmental suitability of unit；
(5) the bladder accumulator capacity that present system is selected is larger, and piston accumulator is swift in response, and nitrogen cylinder
Group price it is more cheap, three combines composition stored energy capacitance, can ensure simultaneously hydraulic accumulation energy system action moment,
It participates in primary frequency modulation depth and ensure that the cost of unit entirety is not too high, be more convenient for realizing industrialization；
(6) the primary frequency modulation control for realizing unit in present system with hydraulic accumulation energy system, can be to avoid conventional wind
System frequency secondary the problems such as falling is caused in generating set because of frequency modulation；
(7) present system, can be by the defeated of excitation synchronous generator under the precondition for not needing converter plant
Revolving speed control out is steady state value, and electric power is directly incorporated to bulk power grid through grid-connection cabinet by excitation synchronous generator, greatly simplifies tradition
The structure and control strategy of wind power generating set；
(8) main member in present system all on the ground, is convenient for current check and maintenance, and conventional wind generates electricity
The principal organ of unit is not easy to ordinary maintenance and inspection on pylon.
The present invention is based on the frequency dynamic Real-time Balancings of hydraulic accumulation energy subsystem, so that the maximum power that wind energy conversion system is kept chases after
Track point realizes that wind energy utilization maximizes, the secondary of frequency is avoided to fall；In unit running process, hydraulic energy-accumulating subsystem phase
Compared with the inertia energy storage of wind energy conversion system, the energy of storage is more, bears larger range of mains frequency fluctuation, keeps machine to greatest extent
Group stability of grid connection operation.
Detailed description of the invention
Fig. 1 is the energy storage type hydraulic wind power generating set primary frequency control system principle sketch of the embodiment of the present invention；
Fig. 2 is the energy storage type hydraulic wind power generating set primary frequency control system control principle drawing of the embodiment of the present invention.
In figure: 1, wind wheel, 2, anemoclinograph, 3, first shaft coupling, the 4, first torque and speed sensors, 5, the big row of low speed
Measure hydraulic pump, the 6, first overflow valve, 7, check valve, the 8, second overflow valve, 9, hydraulic quantitative slippage pump, 10, motor, 11, hydraulic
Fuel tank, 12, flow sensor, 13, proportional throttle valve, 14, variable displacement motor, the 15, first speed probe, the 16, second revolving speed turn
Square sensor, the 17, second speed probe, 3.1, second shaft coupling, 18, hydraulic pump/motor, 19, pressure sensor, 20, gas
Bladder type hydropneumatic accumulator, 21, piston accumulator, 22, nitrogen cylinder group, 23, third torque and speed sensors, 3.2, third shaft coupling,
24, excitation synchronous generator, 25, grid-connection cabinet, 26, primary frequency modulation controller.
Specific embodiment
For the ease of understanding concrete principle and control method of the invention, this hair is described in detail by attached drawing now
The full and accurate embodiment of bright system.
A kind of energy storage type hydraulic wind power generating set primary frequency control system, as shown in Figure 1, it includes wind wheel 1, wind speed and wind
To instrument 2, first shaft coupling 3, the first torque and speed sensors 4, low speed huge discharge hydraulic pump 5, the first overflow valve 6, check valve 7,
Second overflow valve 8, hydraulic quantitative slippage pump 9, motor 10, hydraulic oil container 11, flow sensor 12, proportional throttle valve 13, variable
Motor 14, the first speed probe 15, the second torque and speed sensors 16, the second speed probe 17, second shaft coupling 3.1,
Hydraulic pump/motor 18, pressure sensor 19, bladder accumulator 20, piston accumulator 21, nitrogen cylinder group 22, third revolving speed
Torque sensor 23, third shaft coupling 3.2, excitation synchronous generator 24, grid-connection cabinet 25, primary frequency modulation controller 26 and hydraulic tube
Road；
The wind wheel 1 drives low speed huge discharge hydraulic pump 5 to rotate to hydraulic by first shaft coupling 3 under wind energy
Quantitative change motor 14 in type wind power generating set system is for high pressure oil；5 oil outlet of low speed huge discharge hydraulic pump sequential connection first
The oil inlet of overflow valve 6 and the oil inlet of proportional throttle valve 13；Motor 10 is connected with hydraulic quantitative slippage pump 9；Hydraulic quantitative benefit
The oil outlet of oil pump 9 respectively with the oil inlet of check valve 7, the oil inlet of the second overflow valve 8, the first overflow valve 6 oil outlet and
The oil inlet of low speed huge discharge hydraulic pump 5 connects, the oil outlet of the oil inlet of hydraulic quantitative slippage pump 9 and the second overflow valve 8 with
Hydraulic oil container connection；The oil outlet of check valve 7 is connect with the oil inlet of proportional throttle valve 13, and hydraulic oil passes through proportional throttle valve 13
Oil outlet flow to the oil inlet of variable displacement motor 14, variable displacement motor 14 is connected by second shaft coupling 3.1 and hydraulic pump/motor 18
It connects；18 one end of pump/motor is connect with bladder accumulator 20, piston accumulator 21 and nitrogen cylinder group 22, the other end
It is connected by third shaft coupling 3.2 with excitation synchronous generator 24；Excitation synchronous generator 24 is connect with grid-connection cabinet 25；
The wind wheel 1 drives low speed huge discharge hydraulic pump 5 to rotate under wind energy, and oil liquid is all the way through the first overflow valve
6 open when system pressure is excessively high, realize the circulation of oil liquid, and anti-locking system is damaged because of hypertonia；Ratio is flowed through all the way
After example throttle valve 13 drives hydraulic pump/motor 18 to rotate, the oil inlet of low speed huge discharge hydraulic pump 5 is flowed to through oil circuit L2, is formed
Hydraulic closed control loop；Proportional throttle valve 13 exports the tune of revolving speed by adjusting the realization of valve port opening size to variable displacement motor 14
It is whole；Check valve 7, the second overflow valve 8, hydraulic quantitative slippage pump 9 and motor 10 form a hydraulic oil filling system, are replenished in time
The hydraulic oil leaked in hydraulic system, and then keep hydraulic system to continue working, while also can be the hydraulic oil in hydraulic system
Cooling improves Hydraulic Elements working performance；Check valve 7 can prevent hydraulic oil liquid from opposite direction reflux occur, the second overflow valve 8
Effect be also opened when system pressure is excessively high, realize the circulation of oil liquid, can anti-locking system be damaged because of hypertonia；
The hydraulic pump/motor 18 starts turning under the promotion of variable displacement motor 14, and then is pushed away by third shaft coupling 3.2
The power generation of hydraulic wind power generating set is realized in the dynamic rotation of excitation synchronous generator 24, excitation synchronous generator 24 by with it is grid-connected
Cabinet is connected, and grid-connection cabinet is mounted directly on the ground, and in 24 side of excitation synchronous generator；The electricity that unit is issued
Among being connected to the grid, and then complete wind-electricity integration process；Bladder accumulator 20 has the advantages that capacity is big, piston accumulator
21, which have the advantages that be swift in response, which acts fast, nitrogen cylinder group 22, has the advantages that relative low price, they simultaneously with hydraulic pump/
Motor 18 acts on, can or grid collapses larger in wind-force when causing grid voltage sags, absorb by wind energy transformation and
The extra hydraulic energy come, and stored；In wind-force deficiency, can discharge storage hydraulic energy push hydraulic pump/
Motor 18 rotates, so that it is guaranteed that the output revolving speed of hydraulic pump/motor 18 is steady state value, can be realized to hydraulic Wind turbines
Primary frequency modulation, while also can be improved the stability of unit institute generation frequency.
The anemoclinograph 2 is mounted on real-time monitoring wind speed in tower, the first torque and speed sensors 4, the second revolving speed
Torque sensor 16 and third torque and speed sensors 23 are separately mounted to first shaft coupling 3, second shaft coupling 3.1 and third connection
On axis device 3.2, it is respectively used to the rotational speed and torque of monitoring low speed huge discharge hydraulic pump 5, variable displacement motor 14 and hydraulic pump/motor 18；
First speed probe 15, the second speed probe 17 are separately mounted in second shaft coupling 3.1 and third shaft coupling 3.2, point
Not Yong Yu monitored parameters motor 14 and hydraulic pump/motor 18 revolving speed；Flow sensor 12 for monitor proportional throttle valve 13 into
Oil port uninterrupted, all rotational speed and torque signal, tach signal and flow signals monitored feed back to primary frequency modulation control
In device 26 processed, adjustment of the unit to 14 pivot angle of propeller pitch angle and variable displacement motor of wind wheel 1 is realized, cooperation hydraulic accumulation energy subsystem is realized
Dynamic Programming to energy storage/discharge in unit, and then realize the stabilization of unit output revolving speed, to ensure, generation frequency is steady
It is fixed；Pressure sensor 19 is used to monitor the real-time dynamic pressure of hydraulic accumulation energy subsystem, and signal is timely feedbacked to primary and is adjusted
In frequency controller 26, to ensure unit work in safer environment.
The present invention adjusts the concrete operating principle under operating condition for different frequency and carries out as described below:
(1) start
When signal of the system feedback into primary frequency modulation controller 26 is more than ± 0.2Hz, energy storage type hydraulic wind-force hair
The primary frequency control system of motor group starts to start, and is handled by 26 pairs of feedback signals received of primary frequency modulation controller,
After through amplitude limit link, time delay process, control signal is issued, realizes the quick start of frequency modulation system.
(2) " putting fastly " frequency modulation of hydraulic accumulation energy subsystem
The load condition of power grid be in a short time it is random, unstable, when access power grid in load reduce or wind
Power very little energy storage type hydraulic wind power generating set institute generated energy can not meet when needing, and primary frequency modulation controller 26 is to hydraulic
Pump/motor 18 issues control signal, and hydraulic pump/motor 18 is used as hydraulic motor at this time, will be stored in bladder accumulator before
20, the low speed huge discharge that the high-pressure and hydraulic in piston accumulator 21 and nitrogen cylinder group 22 can release and wind wheel 1 drives
The high pressure liquid pressure oil that the rotation of hydraulic pump 5 generates drives excitation synchronous generator 24 to rotate together, so that hydraulic wind-driven generator
Group is also maintained at constant output rotary speed working state in the case where wind-force is smaller or network load is less, realizes and stablizes
Power generation, keeps the frequency stabilization of system.
(3) " fast punching " frequency modulation of hydraulic accumulation energy subsystem
Hydraulic pump/motor 18 has amphicheirality, may be implemented to bladder accumulator 20, piston accumulator 21 and nitrogen
Bottle 22 capacity of group are rapidly injected.Grid voltage sags or the larger energy storage type hydraulic of wind-force are caused when the grid collapses
Wind power generating set institute's generated energy is more than when needing, and primary frequency modulation controller 26 issues control signal to hydraulic pump/motor 18, this
When hydraulic pump/motor 18 be used as hydraulic pump, by unit conversion extra wind energy with high-pressure and hydraulic can form be stored in air bag
In formula accumulator 20, piston accumulator 21 and nitrogen cylinder group 22, to guarantee the work of excitation synchronous generator 24 constant
Under revolving speed, realizes stable electric generation, keep the frequency stabilization of system.
(4) the throttling frequency modulation of hydraulic system
Reach rated value in the memory capacity for guaranteeing bladder accumulator 20, piston accumulator 21 and nitrogen cylinder group 22
Under precondition, control signal is issued by primary frequency modulation controller 26, can be opened by adjusting the valve port of proportional throttle valve 13
The throttling action that size realizes hydraulic system is spent, by energy that is extra inside unit, can not being stored in hydraulic accumulation energy subsystem
Amount is dissipated in the form of being converted to thermal energy, but also the high-voltage oil liquid for reaching 14 inlet of variable displacement motor is reduced.Meanwhile passing through
Primary frequency modulation controller 26 issues control signal, is adjusted to the motor pivot angle of variable displacement motor 14, so that variable displacement motor 14
Stabilization of speed is exported in steady state value, the processing to excess energy in unit is furthermore achieved, ensure that energy storage type hydraulic wind
Primary frequency control ability of the power generator group under various operating conditions.
(5) it shuts down
According to signal of the system Real-time Feedback into primary frequency modulation controller 26, made point by primary frequency modulation controller 26
Analysis, when the undulated control of frequency is within ± 0.2Hz, 26 monitoring hydraulic wind-driven generators of primary frequency modulation controller
The monitoring signals that sensor element inputs in group, without machines such as comparative example throttle valve 13, variable displacement motor 14, hydraulic pump/motors 18
Element in group issues control signal, i.e. the primary frequency control system of energy storage type hydraulic wind power generating set is shut down.
In above-mentioned operating condition, check valve 7, the second overflow valve 8, hydraulic quantitative slippage pump 9, motor 10 form a hydraulic benefit
The hydraulic oil leaked in hydraulic system is replenished in time in oil system, and then keeps systems stay work, while can also be in system
Hydraulic oil cooling, improves Hydraulic Elements working performance；Check valve 7, which can prevent from bleeding off pressure oil liquid, there is opposite direction reflux, the second overflow
The effect of valve 8 is the opening when hydraulic system pressure is excessively high, realizes the circulation of oil liquid, can prevent hydraulic system due to hypertonia
It is damaged.
As shown in Fig. 2, the control method that the present invention will be described in detail:
When wind energy or mains frequency fluctuate, based on the feedback signal that primary frequency modulation controller 26 receives, pass through
Primary frequency modulation controller 26 issues control signal and controls the hydraulic pump/motor 18 in system, makes it possible to according to liquid
Under different working conditions locating for die mould wind power generating set, it is used as hydraulic pump or hydraulic motor, to realize hydraulic wind
The primary frequency modulation of power generator group controls.
When frequency fluctuates in lesser range, above-mentioned control method can satisfy requirement.If when wind-force is very big or
Person is very big because of frequency fluctuation caused by electric network fault, when required control target is not achieved in above-mentioned control method, in hydraulic storage
The memory capacity of bladder accumulator 20, piston accumulator 21 in energy subsystem and nitrogen cylinder group 22 reaches maximum premise
Under the conditions of, then it can be adjusted by the valve port opening and 14 pivot angle of variable displacement motor of comparative example throttle valve 13, to more in unit
Remaining energy is allocated and dissipates, and extra high-pressure and hydraulic can be dissipated in the form of thermal energy, while adjusting variable displacement motor
14 motor pivot angle makes its work in constant rotational speed value, so that it is guaranteed that the output stabilization of speed of excitation synchronous generator 24 is in constant
Value realizes that unit continues the control of grid-connected and system frequency Primary regulation.
Hydraulic accumulation energy system can provide fast power regulating power for Wind turbines, improve the inertia of unit, effectively press down
The medium, high frequency component of wind power fluctuation processed, participates in Wind turbines frequency and adjusts；Mains frequency fluctuation is reduced, is reduced extensive
The frequency modulation pressure and capacity requirement of power grid when wind-electricity integration.But traditional energy-storage system, no matter it is disposed on Wind turbines level
On, or in wind power plant level, rely only on real power control and frequency modulation demand that energy storage undertakes wind power plant, necessarily will cause energy storage
Big, at high cost, economic benefit the is bad problem of capacity configuration.
Claims (2)
1. a kind of energy storage type hydraulic wind power generating set primary frequency control system, including wind wheel (1), anemoclinograph (2), first
Shaft coupling (3), the first torque and speed sensors (4), low speed huge discharge hydraulic pump (5), the first overflow valve (6), check valve (7),
Second overflow valve (8), hydraulic quantitative slippage pump (9), motor (10), hydraulic oil container (11), flow sensor (12), ratio throttling
Valve (13), variable displacement motor (14), the first speed probe (15), the second torque and speed sensors (16), the second speed probe
(17), second shaft coupling (3.1), hydraulic pump/motor (18), pressure sensor (19), bladder accumulator (20), piston type store
It can device (21), nitrogen cylinder group (22), third torque and speed sensors (23), third shaft coupling (3.2), excitation synchronous generator
(24), grid-connection cabinet (25), primary frequency modulation controller (26) and fluid pressure line；It is characterized by:
The wind wheel (1) is rotated by first shaft coupling (3) driving low speed huge discharge hydraulic pump (5) to liquid under wind energy
Quantitative change motor (14) in die mould wind power generating set system is for high pressure oil；Low speed huge discharge hydraulic pump (5) oil outlet sequence connects
Connect the oil inlet of the first overflow valve (6) and the oil inlet of proportional throttle valve (13)；Motor (10) and hydraulic quantitative slippage pump (9) phase
Even；The oil outlet of hydraulic quantitative slippage pump (9) respectively with the oil inlet of check valve (7), the oil inlet of the second overflow valve (8), the
The oil outlet of one overflow valve (6) is connected with the oil inlet of low speed huge discharge hydraulic pump (5), the oil inlet of hydraulic quantitative slippage pump (9)
Mouth and the oil outlet of the second overflow valve (8) are connected with hydraulic tank；The oil outlet of check valve (7) and proportional throttle valve (13) into
Hydraulic fluid port connection, hydraulic oil flow to the oil inlet of variable displacement motor (14), variable displacement motor by the oil outlet of proportional throttle valve (13)
(14) it is connect by second shaft coupling (3.1) with hydraulic pump/motor (18)；Pump/motor (18) one end and gasbag-type accumulation of energy
Device (20), piston accumulator (21) and nitrogen cylinder group (22) connection, the other end are same by third shaft coupling (3.2) and excitation
Step generator (24) is connected；Excitation synchronous generator (24) is connect with grid-connection cabinet (25)；
The wind wheel (1) drives low speed huge discharge hydraulic pump (5) to rotate under wind energy, and oil liquid is all the way through the first overflow valve
(6) it is opened when system pressure is excessively high, realizes the circulation of oil liquid, anti-locking system is damaged because of hypertonia；It flows through all the way
After proportional throttle valve (13) drives hydraulic pump/motor (18) rotation, the oil inlet of low speed huge discharge hydraulic pump (5) is flowed to through oil circuit L2
Mouthful, form hydraulic closed control loop；Proportional throttle valve (13) is realized by adjusting valve port opening size to variable displacement motor (14)
Export the adjustment of revolving speed；Check valve (7), the second overflow valve (8), hydraulic quantitative slippage pump (9) and motor (10) form one
Hydraulic oil filling system is replenished in time the hydraulic oil leaked in hydraulic system, and then keeps hydraulic system to continue working, while also can
For the hydraulic oil cooling in hydraulic system, Hydraulic Elements working performance is improved；It is anti-that check valve (7) can prevent hydraulic oil liquid from occurring
Direction reflux, the effect of the second overflow valve (8) is also the opening when system pressure is excessively high, realizes the circulation of oil liquid, can prevent
System is damaged because of hypertonia；
The hydraulic pump/motor (18) starts turning under the promotion of variable displacement motor (14), and then passes through third shaft coupling (3.2)
Excitation synchronous generator (24) rotation is pushed to realize the power generation of hydraulic wind power generating set, excitation synchronous generator (24) passes through
It is connected with grid-connection cabinet, among the electricity that unit is issued is connected to the grid, and then completes wind-electricity integration process；Gasbag-type accumulation of energy
Device (20), piston accumulator (21) and nitrogen cylinder group (22) and hydraulic pump/motor (18) act on, can it is larger in wind-force or
When grid collapses cause grid voltage sags, the extra hydraulic energy from wind energy transformation is absorbed, and stored
Come；In wind-force deficiency, the hydraulic energy that can discharge storage pushes hydraulic pump/motor (18) rotation, so that it is guaranteed that hydraulic pump/horse
Output revolving speed up to (18) is steady state value, can be realized the primary frequency modulation to hydraulic Wind turbines, while also can be improved machine
The stability of group institute's generation frequency；
The anemoclinograph (2) is mounted on real-time monitoring wind speed in tower, the first torque and speed sensors (4), the second revolving speed
Torque sensor (16) and third torque and speed sensors (23) are separately mounted to the first third shaft coupling (3), second shaft coupling
(3.1) and on third shaft coupling (3.2), monitoring low speed huge discharge hydraulic pump (5), variable displacement motor (14) and hydraulic are respectively used to
The rotational speed and torque of pump/motor (18)；First speed probe (15), the second speed probe (17) are separately mounted to the second shaft coupling
On device (3.1) and third shaft coupling (3.2), it is respectively used to the revolving speed of monitored parameters motor (14) and hydraulic pump/motor (18)；Stream
Quantity sensor (12) for monitoring uninterrupted at proportional throttle valve (13) oil inlet, all rotational speed and torque signals monitored,
Tach signal and flow signal are fed back in primary frequency modulation controller (26), realize propeller pitch angle and change of the unit to wind wheel (1)
The adjustment of motor (14) pivot angle is measured, cooperation hydraulic accumulation energy subsystem realizes the Dynamic Programming to energy storage/discharge in unit, Jin Ershi
The stabilization of existing unit output revolving speed, the stabilization of generation frequency to ensure；Pressure sensor (19) is for monitoring hydraulic accumulation energy
The real-time dynamic pressure of system, and signal is timely feedbacked into primary frequency modulation controller (26), with ensure unit work compared with
For in the environment of safety.
2. a kind of control method of energy storage type hydraulic wind power generating set primary frequency control system according to claim 1, should
Method content the following steps are included:
When wind energy or mains frequency fluctuate, based on the feedback signal that primary frequency modulation controller (26) receive, pass through one
Secondary frequency modulation control device (26) issues control signal and controls the hydraulic pump/motor (18) in system, so as to according to
Under different working conditions locating for hydraulic wind power generating set be used as hydraulic pump or hydraulic motor, in unit energy storage/
The Dynamic Programming put, to realize the primary frequency modulation control of hydraulic wind power generating set；
It is characterized by: the control method content further include: when frequency fluctuates in lesser range, above-mentioned control method
It can satisfy requirement；If when wind-force is very big or because of electric network fault caused by frequency fluctuation, above-mentioned control method is not up to
When to required control target, bladder accumulator (20), piston accumulator (21) in hydraulic accumulation energy subsystem and
The memory capacity of nitrogen cylinder group (22) reaches under maximum precondition, then can be opened by the valve port of comparative example throttle valve (13)
Degree and variable displacement motor (14) pivot angle are adjusted, and energy extra in unit is allocated and is dissipated, and allow extra high pressure liquid
Pressure energy is dissipated in the form of thermal energy, while the motor pivot angle for adjusting variable displacement motor (14) makes its work in constant rotational speed value, from
And the output stabilization of speed for ensuring excitation synchronous generator (24) realizes that unit continues grid-connected and system frequency one in steady state value
The function of secondary adjusting.
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| CN108915942A (en) * | 2018-07-16 | 2018-11-30 | 山东大学 | A kind of energy storage type hydraulic Wave energy generating system and its working method |
| CN108819798B (en) * | 2018-07-24 | 2023-06-02 | 西南交通大学 | Wind power liquid driving system |
| CN108895043B (en) * | 2018-08-09 | 2020-07-31 | 江苏大学 | Constant pressure control device and method for hydraulic pump |
| CN110725817B (en) * | 2019-10-11 | 2021-02-02 | 太原理工大学 | High-energy-efficiency control method of servo system for independently adjusting electrohydraulic position at inlet and outlet based on proportional overflow valve |
| CN110805521B (en) * | 2019-11-08 | 2020-11-13 | 燕山大学 | Novel frequency modulation control system and control method for energy storage type hydraulic wind generating set |
| CN110985295B (en) * | 2019-12-18 | 2021-10-12 | 燕山大学 | Grid-connected rotating speed control method for energy storage type hydraulic wind generating set |
| CN111022264A (en) * | 2020-01-08 | 2020-04-17 | 兰州理工大学 | Hydraulic wind generating set |
| CN111997837B (en) * | 2020-08-17 | 2022-10-18 | 燕山大学 | Hydraulic wind turbine generator power active control system and active control method thereof |
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| WO2012026014A1 (en) * | 2010-08-26 | 2012-03-01 | 三菱重工業株式会社 | Wind power generation apparatus and output control method |
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