CN114483456A - Grid-connected rotating speed control system and method for energy storage type hydraulic wind generating set - Google Patents
Grid-connected rotating speed control system and method for energy storage type hydraulic wind generating set Download PDFInfo
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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
- 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
- F03D15/00—Transmission of mechanical power
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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
- F03D7/00—Controlling wind motors
- F03D7/02—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor
- F03D7/04—Automatic control; Regulation
- F03D7/042—Automatic control; Regulation by means of an electrical or electronic controller
- F03D7/043—Automatic control; Regulation by means of an electrical or electronic controller characterised by the type of control logic
- F03D7/046—Automatic control; Regulation by means of an electrical or electronic controller characterised by the type of control logic with learning or adaptive control, e.g. self-tuning, fuzzy logic or neural network
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- 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
- F03D9/20—Wind motors characterised by the driven apparatus
- F03D9/25—Wind motors characterised by the driven apparatus the apparatus being an electrical generator
- F03D9/255—Wind motors characterised by the driven apparatus the apparatus being an electrical generator connected to electrical distribution networks; Arrangements therefor
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- 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
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention provides a grid-connected rotating speed control system and method for an energy storage type hydraulic wind generating set, wherein the system comprises a wind turbine device, a hydraulic transmission device, a hydraulic energy storage device and a grid-connected generating device; the wind power device and the hydraulic transmission device, the hydraulic transmission device and the hydraulic energy storage device, and the hydraulic energy storage device and the grid-connected power generation device are coaxially and rigidly connected. The hydraulic energy storage device is adopted, so that impact caused by sudden voltage change can be buffered, and the capability of continuous operation of equipment without disconnection is ensured; meanwhile, the hydraulic energy storage device can regulate and control the energy input in the system in real time, and coordinate the energy allocation from the root, thereby not only avoiding the damage of redundant energy, but also making the best use of the redundant energy, absorbing the energy under the pump control condition and outputting the energy under the working condition of the motor; traditional wind speed sensors and flow sensors are omitted, the system flexibility is higher, and the equipment cost is saved.
Description
Technical Field
The invention belongs to the technical field of wind power generation, and particularly relates to a grid-connected rotating speed control system and method for an energy storage type hydraulic wind generating set.
Background
With the increasing environmental and energy problems, wind power generation is more and more concerned at home and abroad, and the wind power generation industry is rapidly developed. However, the wind power generation output power has the characteristics of intermittency and randomness under the influence of weather conditions. Besides large power fluctuation caused by large-scale wind power generation grid connection, the loss of system inertia is easily caused, and the frequency stability of the system is influenced. In order to ensure safe and stable operation of the power system during grid connection, the grid connection rotating speed control effect of the wind turbine generator needs to be improved.
A wind turbine adaptive pitch control system as described in US09347430B 2. An adaptive pitch control system for a wind turbine is used in a variable speed Doubly Fed Induction Generator (DFIG) system. An adaptive neural network produces optimized pitch control of the controller gain. Intelligent differential evolution of pitch controller parameters, one type of genetic algorithm generation. Training of a back-propagation neural network uses the generated pitch controller parameters to adjust the weight of the network, in a variable wind speed environment, based on system conditions. The wind energy generator is a doubly-fed induction generator (DFIG), the constant K and the output suitable for being connected to a pitch servo, and the output of the PI pitch controller comprises a device for sending a pitch command to a pitch steering engine to control a pitch angle; a Back Propagation Neural Network (BPNN) has signals applied to the plurality of signal paths. However, the method adopts a BP neural network, the network is a global approximation network, all weights of the network need to be readjusted every time of sample learning, the convergence speed is low, the network is easy to fall into local minimum, and the requirement of high real-time performance of a control system is difficult to meet.
An intelligent control system and method for a wind generating set are disclosed in Chinese patent CN 113357083A. The method comprises a plurality of edge computing subsystems and at least one wind field level computing subsystem which are mutually communicated and connected, wherein each edge computing subsystem is respectively communicated and connected with at least one main control device; the main control devices communicate with the edge computing subsystems and the wind field level computing subsystems to exchange data, algorithm model operation results of the edge computing subsystems and the wind field level computing subsystems are fed back to the main control devices, intelligent control and operation state adjustment are conducted on the fans corresponding to the main control devices, wind power intelligent control is achieved, multi-dimensional data of the fans are collected and processed, intelligent control and state adjustment of the fans are achieved based on the algorithm models deployed in the fans and the wind field, and intelligent algorithms are completed. The method still uses a large number of traditional sensors, the manufacturing cost is high, and the using method is complicated.
In summary, most of the existing grid-connected rotating speed control methods for the energy storage hydraulic wind generating set cannot fundamentally solve the problem caused by external disturbance of the system in the control process.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a grid-connected rotating speed control system and method for an energy storage type hydraulic wind generating set.
In a first aspect, the invention provides a grid-connected rotating speed control system of an energy storage type hydraulic wind generating set, which comprises a wind turbine device, a hydraulic transmission device, a hydraulic energy storage device and a grid-connected generating device; the wind power device and the hydraulic transmission device, the hydraulic transmission device and the hydraulic energy storage device, and the hydraulic energy storage device and the grid-connected power generation device are coaxially and rigidly connected;
the wind turbine device comprises a wind speed predictor, a wind wheel and a first transmission shaft; the wind wheel is in transmission connection with a first transmission shaft, and the wind speed predictor is positioned on one side, far away from the first transmission shaft, of the wind wheel;
the hydraulic transmission device comprises a first rotating speed torque sensor, a constant delivery pump, a high-pressure pipeline, a first one-way valve, a second one-way valve, a first overflow valve, an oil supplementing pump, an oil supplementing tank, a safety valve, a flow controller, a rotating speed controller, a variable motor, a second rotating speed torque sensor, a low-pressure pipeline and a power controller;
the hydraulic energy storage device comprises a variable pump motor, an energy accumulator and an energy storage system oil tank;
the grid-connected power generation device comprises a generator, a grid-connected cabinet and a power grid;
the first rotating speed torque sensor is arranged on the first transmission shaft; the main shaft of the fixed displacement pump is in transmission connection with one end, far away from the wind wheel, of the first transmission shaft; an oil inlet of the constant delivery pump absorbs oil from the oil supplementing oil tank through the low-pressure pipeline, and a high-pressure oil is output from an oil pressing port through the high-pressure pipeline; the high-pressure pipeline is provided with the flow controller; the outlet end of the first one-way valve is communicated with the high-pressure pipeline, and the inlet end of the first one-way valve is communicated with the inlet end of the second one-way valve; the outlet end of the second one-way valve is communicated with the low-pressure pipeline; two ends of the first overflow valve are respectively connected with an oil pressing port and an oil supplementing oil tank of the oil supplementing pump; the oil pressing port of the oil replenishing pump is respectively connected with the inlet end of the first one-way valve and the inlet end of the second one-way valve, and the oil suction port is connected with the oil replenishing oil tank; two ends of the safety valve are respectively connected with the high-pressure pipeline and the low-pressure pipeline; the input end of the rotating speed controller is respectively connected with the flow controller, the second rotating speed torque sensor and the grid-connected cabinet, and the output end of the rotating speed controller is connected with the variable motor; the oil suction port of the variable motor is connected with the high-pressure pipeline, and the oil discharge port of the variable motor is connected with the low-pressure pipeline; the main shaft of the variable motor is coaxially connected with the main shaft of the generator through a second transmission shaft; the generator generates power and inputs electric energy to the power grid; the grid-connected cabinet is arranged between the generator and the power grid; the second rotating speed and torque sensor is arranged on the second transmission shaft; the variable pump motor is connected with the energy storage system oil tank and is connected with the energy accumulator through an energy storage pipeline, so that the energy accumulator can store and discharge energy in different states; the input end of the power controller is respectively connected with the wind speed predictor, the first rotating speed torque sensor, the second rotating speed torque sensor and the grid-connected cabinet, and the output end of the power controller is connected with the variable pump motor.
In a second aspect, the invention provides a grid-connected rotation speed control method for an energy storage type hydraulic wind generating set, which is applied to the grid-connected rotation speed control system for the energy storage type hydraulic wind generating set in the first aspect, and the control method comprises the following steps:
when the energy storage type hydraulic wind generating set is disturbed, the rotating speed controller acquires the rotating speed of the variable motor through the second rotating speed torque sensor, the flow controller acquires the flow of the high-pressure pipeline, the grid-connected cabinet acquires the frequency and the voltage of a power grid, and then the rotating speed controller outputs a control signal to the variable motor to realize the swing angle control of the variable motor and change the displacement of the variable motor, so that the oil pressure of high-pressure oil in the high-pressure pipeline of the hydraulic transmission part is correspondingly changed, the rotating speed of the constant delivery pump is changed, and the energy stored in the wind turbine is released;
the power controller acquires wind speed through a wind speed predictor, the first rotating speed torque sensor acquires the rotating speed of a wind wheel and outputs impeller torque, the second rotating speed torque sensor acquires generator torque, the grid-connected cabinet acquires the output power and the voltage of a power grid, then the power controller outputs a control signal to a variable pump motor of the hydraulic energy storage device, the variable pump motor is enabled to be in a motor working condition, high-pressure oil is input into the energy accumulator, and the power controller controls the swing angle of the variable pump motor to be increased so as to enable energy in the energy accumulator to be released rapidly;
after disturbance is eliminated, the rotating speed controller plans the displacement of the variable displacement motor, and the power controller plans the displacement action command of the variable displacement pump motor of the hydraulic energy storage system at the same time, so that the variable displacement pump motor performs energy storage and energy discharge under the working condition of the motor, the output power of the unit is adjusted, and power is dynamically injected into a power grid to realize grid side frequency response.
The invention provides a grid-connected rotating speed control system and method for an energy storage type hydraulic wind generating set, wherein the system comprises a wind turbine device, a hydraulic transmission device, a hydraulic energy storage device and a grid-connected generating device; the wind power device and the hydraulic transmission device, the hydraulic transmission device and the hydraulic energy storage device, and the hydraulic energy storage device and the grid-connected power generation device are coaxially and rigidly connected. The hydraulic energy storage device is adopted, so that impact caused by sudden voltage change can be buffered, and the capability of continuous operation of equipment without disconnection is ensured; meanwhile, the hydraulic energy storage device can regulate and control the energy input in the system in real time, and coordinate the energy allocation from the root, thereby not only avoiding the damage of redundant energy, but also making the best use of the redundant energy, absorbing the energy under the pump control condition and outputting the energy under the working condition of the motor; traditional wind speed sensors and flow sensors are omitted, the system flexibility is higher, and the equipment cost is saved. In addition, compared with the traditional intelligent control algorithm, the real-time performance and effectiveness of the operation result of the algorithm model participating in control are improved, the risk of wind field data leakage is avoided, and the network transmission cost of data outgoing is saved.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a grid-connected rotation speed control system of an energy storage hydraulic wind turbine generator system according to an embodiment of the present invention;
fig. 2 is a working flow chart of a grid-connected rotation speed control method for an energy storage hydraulic wind turbine generator system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, an embodiment of the present invention partially provides a grid-connected rotation speed control system for an energy storage hydraulic wind turbine generator system, which includes a wind turbine device, a hydraulic transmission device, a hydraulic energy storage device, and a grid-connected power generation device; the wind power device and the hydraulic transmission device, the hydraulic transmission device and the hydraulic energy storage device, and the hydraulic energy storage device and the grid-connected power generation device are coaxially and rigidly connected;
the wind turbine device comprises a wind speed predictor 1, a wind wheel 2 and a first transmission shaft 3; the wind wheel 2 is in transmission connection with a first transmission shaft 3, and the wind speed predictor 1 is positioned on one side, far away from the first transmission shaft 3, of the wind wheel 2;
the hydraulic transmission device comprises a first rotating speed torque sensor 4, a fixed displacement pump 5, a high-pressure pipeline 6, a first check valve 7, a second check valve 8, a first overflow valve 9, an oil supplementing pump 10, an oil supplementing oil tank 11, a safety valve 12, a flow controller 13, a rotating speed controller 14, a variable motor 15, a second rotating speed torque sensor 16, a low-pressure pipeline 24 and a power controller 25;
the hydraulic energy storage device comprises a variable pump motor 17, an energy accumulator 18 and an energy storage system oil tank 19;
the grid-connected power generation device comprises a generator 20, a grid-connected cabinet 21 and a power grid 22;
the first rotational speed and torque sensor 4 is arranged on the first transmission shaft 3; a main shaft of the fixed displacement pump 5 is in transmission connection with one end, far away from the wind wheel 2, of the first transmission shaft 3; an oil inlet of the constant delivery pump 5 sucks oil from the oil supplementing oil tank 11 through the low-pressure pipeline 24, and a high-pressure oil outlet outputs high-pressure oil through the high-pressure pipeline 6; the flow controller 13 is arranged on the high-pressure pipeline 6; the outlet end of the first one-way valve 7 is communicated with the high-pressure pipeline 6, and the inlet end of the first one-way valve is communicated with the inlet end of the second one-way valve 8; the outlet end of the second check valve 8 is communicated with the low-pressure pipeline 24; two ends of the first overflow valve 9 are respectively connected with an oil pressing port of the oil supply pump 10 and an oil supply tank 11; the oil pressing port of the oil supplementing pump 10 is respectively connected with the inlet end of the first one-way valve 7 and the inlet end of the second one-way valve 8, and the oil suction port is connected with the oil supplementing oil tank 11; the two ends of the safety valve 12 are respectively connected with the high-pressure pipeline 6 and the low-pressure pipeline 24; the input end of the rotating speed controller 14 is respectively connected with the flow controller 13, the second rotating speed torque sensor 16 and the grid-connected cabinet 21, and the output end of the rotating speed controller is connected with the variable motor 15; the oil suction port of the variable motor 15 is connected with the high-pressure pipeline 6, and the oil discharge port is connected with the low-pressure pipeline 24; the main shaft of the variable motor 15 is coaxially connected with the main shaft of the generator 20 through a second transmission shaft 26; the generator 20 generates input electrical energy to the grid 22; the grid-connected cabinet 21 is arranged between the generator 20 and the power grid 22; the second rotational speed and torque sensor 16 is mounted on the second transmission shaft 26; the variable pump motor 17 is connected with the energy storage system oil tank 19 and is connected with the energy accumulator 18 through an energy storage pipeline 23, so that the energy accumulator 18 can store and discharge energy in different states; the input end of the power controller 25 is respectively connected with the wind speed predictor 1, the first rotating speed and torque sensor 4, the second rotating speed and torque sensor 16 and the grid-connected cabinet 21, and the output end is connected with the variable pump motor 17.
As shown in fig. 2, an embodiment of the present invention further provides a grid-connected rotation speed control method for an energy storage hydraulic wind turbine generator system, which is applied to the grid-connected rotation speed control system for the energy storage hydraulic wind turbine generator system, and the control method includes: when the energy storage type hydraulic wind generating set is disturbed, the rotating speed controller 14 acquires the rotating speed of the variable motor 15 through the second rotating speed torque sensor 16, the flow controller 13 acquires the flow of the high-pressure pipeline 6, the grid-connected cabinet 21 acquires the frequency and the voltage of the power grid 22, and then the rotating speed controller 14 outputs a control signal to the variable motor 15 to realize the swing angle control of the variable motor 15 and change the displacement of the variable motor 15, so that the oil pressure of high-pressure oil in the high-pressure pipeline 6 of the hydraulic transmission part is correspondingly changed, the rotating speed of the constant delivery pump 5 is changed, and the energy stored in the wind turbine is released;
the power controller 25 collects wind speed through a wind speed predictor 1, the first rotating speed torque sensor 4 collects rotating speed of a wind wheel 2 and outputs impeller torque, the second rotating speed torque sensor 16 collects torque of a generator 20, the grid-connected cabinet 21 collects output power and grid voltage of the generator 20, then the power controller 25 outputs a control signal to a variable pump motor 17 of a hydraulic energy storage device, the variable pump motor 17 is enabled to be in a motor working condition, high-pressure oil is input into the energy accumulator 18, and the power controller 25 controls the swing angle of the variable pump motor 17 to be increased so as to enable energy in the energy accumulator 18 to be released rapidly;
after disturbance is eliminated, the rotation speed controller 14 plans the displacement of the variable displacement motor 15, and the power controller 25 plans the displacement action command of the variable displacement pump motor 17 of the hydraulic energy storage system at the same time, so that the variable displacement pump motor 17 performs energy storage and energy release under the motor working condition, the output power of the unit is adjusted, and power is dynamically injected into the power grid 22 to realize grid side frequency response.
The wind speed predictor 1 predicts the wind speed by using a neural network of an RBF function. Grid-connected rotating speed control process: a neural network based on RBF functions and a flow observer 13 which is a non-linear extended state observer.
Firstly, analyzing the influence of a series of problems such as uncertainty of a model, time-varying property of parameters, external disturbance of a system and the like on the motor rotating speed control static state to obtain the nonlinearity of a pump control blade motor rotating speed control system as follows:
wherein the content of the first and second substances,
is the angular velocity of the quantitative pump, with unit rad/s;
is the angular velocity of the quantitative motor, with unit rad/s; phThe pressure difference of the inlet and the outlet of the quantitative pump is expressed in Pa; b ispThe damping coefficient of the fixed displacement pump is expressed in the unit of N/(m/s); j. the design is a squarepIs the rotational inertia of the fixed displacement pump with the unit of kg.m2；JmTo quantify the rotational inertia of the motor in kg m2；DpIs the discharge capacity of the fixed displacement pump, and the unit is m3S; v is the total volume of the high pressure chamber in m3；DmFor metering the displacement of the motor in m3/s；CtAs a total leakage coefficient Ct＝Ctp+CtmUnit is m3/(s·Pa)；βeThe volume elastic modulus of the oil is Pa; t isvThe unit of the pneumatic torque output by the wind turbine under the action of a certain wind speed is N.m; t isLThe unit is N · m for quantifying the motor load moment.
And then, combining a neural network based on an RBF function and a nonlinear extended state observer to obtain an intelligent rotating speed control strategy of the nonlinear system of the pump control hydraulic motor, observing unknown nonlinear dynamics and external disturbance on line, processing the problem of non-matching interference, and observing and compensating key parameters of a hydraulic load simulation system of the pump control motor. And initializing state observed quantity and neural network weight by taking the quantitative motor rotating speed as control output, identifying the time variable of the system by an extended state observer of the RBF neural network, and observing external disturbance and internal disturbance.
Wherein eta isj+1Is a state variable;
is the error value of the state variable;
a bounded constant matrix that is an ideal weight;
is RBFNN weight;
is the new state variable error value; mu.s1Parameters of characteristic polynomials in Hurwitz;
for adjustable positive gain, i.e., bandwidth per ESO; etajIs a state variable;
is an n-order new state variable error value; mu.s2Parameters of characteristic polynomials in Hurwitz;
is an n-order new state variable error value; u (α) is the saturated input;
a bounded constant matrix that is an ideal weight;
is RBFNN weight;
for n-order adjustable positive gain, i.e., bandwidth per ESO; etanIs a new state variable of order n.
And then continuously updating the weight formula (1) of the neural network, continuously reducing the error through an approximation function formula (2), providing a virtual control law formula (3), finally obtaining a real rotating speed control law formula (5) through a second-order filtering function formula (4), continuously learning by combining a compensation control law formula (6) and the neural network, continuously revising the rotating speed control law, and finally acting on the system to finally achieve the control effect.
Wherein the content of the first and second substances,
is an ideal weightA bounded matrix of constants;
is RBFNN weight;
is a non-linear function; phi is alIs a virtual control function; k is a radical oflA positive feedback gain; e.g. of the typelIs a tracking error variable;
is an n-order new state variable error value; y isdA variable output value; z is a radical oflIs an error compensation variable;
estimating an error value for the n-order new state variable; phi is aj,ccIs an internal kinetic parameter; r isfjIs an adjustable parameter; phi is aj,cIntroducing filtered output signals for the individual;
a bounded constant matrix is estimated for the ideal weight;
is the filtering error value at the moment j;
filtering error value at n time; Δ u is u (α) - α, the difference between the saturated input and the actual input.
According to the grid-connected rotating speed control system and method for the energy storage type hydraulic wind generating set, the state of the system can be estimated accurately based on the ESO of the RBF-NN, and meanwhile, external disturbance can be estimated accurately. The grid-connected rotating speed control is more flexible, the robustness and the self-adaption performance of the system are improved, and meanwhile, the rapidity and the reliability in the control process are ensured; the intelligent control method based on the neural network can omit the traditional wind speed sensor and flow sensor, has higher system flexibility and saves the equipment cost. In addition, compared with the traditional intelligent control algorithm, the real-time performance and effectiveness of the operation result of the algorithm model participating in control are improved, the risk of wind field data leakage is avoided, and the network transmission cost of data outgoing is saved. The hydraulic energy storage device is adopted, so that impact caused by sudden voltage change can be buffered, and the capability of continuous operation of equipment without disconnection is ensured; meanwhile, the hydraulic energy storage device can regulate and control the energy input in the system in real time, and coordinate the energy allocation fundamentally, so that the damage of redundant energy is avoided, the redundant energy is fully used, the energy is absorbed under the pump control condition, and the energy is output under the working condition of the motor.
The invention has been described in detail with reference to specific embodiments and illustrative examples, but the description is not intended to be construed in a limiting sense. Those skilled in the art will appreciate that various equivalent substitutions, modifications or improvements may be made to the technical solution of the present invention and its embodiments without departing from the spirit and scope of the present invention, which fall within the scope of the present invention. The scope of the invention is defined by the appended claims.
Claims (2)
1. A grid-connected rotating speed control system of an energy storage type hydraulic wind generating set is characterized by comprising a wind turbine device, a hydraulic transmission device, a hydraulic energy storage device and a grid-connected generating device; the wind power device and the hydraulic transmission device, the hydraulic transmission device and the hydraulic energy storage device, and the hydraulic energy storage device and the grid-connected power generation device are coaxially and rigidly connected;
the wind turbine device comprises a wind speed predictor (1), a wind wheel (2) and a first transmission shaft (3); the wind wheel (2) is in transmission connection with a first transmission shaft (3), and the wind speed predictor (1) is positioned on one side, far away from the first transmission shaft (3), of the wind wheel (2);
the hydraulic transmission device comprises a first rotating speed torque sensor (4), a fixed displacement pump (5), a high-pressure pipeline (6), a first check valve (7), a second check valve (8), a first overflow valve (9), an oil supplementing pump (10), an oil supplementing oil tank (11), a safety valve (12), a flow controller (13), a rotating speed controller (14), a variable motor (15), a second rotating speed torque sensor (16), a low-pressure pipeline (24) and a power controller (25);
the hydraulic energy storage device comprises a variable pump motor (17), an energy accumulator (18) and an energy storage system oil tank (19);
the grid-connected power generation device comprises a generator (20), a grid-connected cabinet (21) and a power grid (22);
the first rotating speed and torque sensor (4) is arranged on the first transmission shaft (3); the main shaft of the fixed displacement pump (5) is in transmission connection with one end, far away from the wind wheel (2), of the first transmission shaft (3); an oil inlet of the constant delivery pump (5) sucks oil from the oil supplementing oil tank (11) through the low-pressure pipeline (24), and a high-pressure oil is output from an oil pressing port through the high-pressure pipeline (6); the high-pressure pipeline (6) is provided with the flow controller (13); the outlet end of the first one-way valve (7) is communicated with the high-pressure pipeline (6), and the inlet end of the first one-way valve is communicated with the inlet end of the second one-way valve (8); the outlet end of the second one-way valve (8) is communicated with the low-pressure pipeline (24); two ends of the first overflow valve (9) are respectively connected with a pressure oil port of the oil supplementing pump (10) and an oil supplementing oil tank (11); the oil pressing port of the oil supplementing pump (10) is respectively connected with the inlet end of the first one-way valve (7) and the inlet end of the second one-way valve (8), and the oil suction port is connected with the oil supplementing oil tank (11); two ends of the safety valve (12) are respectively connected with the high-pressure pipeline (6) and the low-pressure pipeline (24); the input end of the rotating speed controller (14) is respectively connected with the flow controller (13), the second rotating speed torque sensor (16) and the grid-connected cabinet (21), and the output end of the rotating speed controller is connected with the variable motor (15); an oil suction port of the variable motor (15) is connected with the high-pressure pipeline (6), and an oil discharge port is connected with the low-pressure pipeline (24); the main shaft of the variable motor (15) is coaxially connected with the main shaft of the generator (20) through a second transmission shaft (26); the generator (20) generating input electrical energy to the grid (22); the grid-connected cabinet (21) is arranged between the generator (20) and the power grid (22); the second rotational speed and torque sensor (16) is mounted on the second transmission shaft (26); the variable pump motor (17) is connected with the energy storage system oil tank (19) and is connected with the energy accumulator (18) through an energy storage pipeline (23) so that the energy accumulator (18) can store and release energy in different states; the input end of the power controller (25) is respectively connected with the wind speed predictor (1), the first rotating speed torque sensor (4), the second rotating speed torque sensor (16) and the grid-connected cabinet (21), and the output end of the power controller is connected with the variable pump motor (17).
2. The grid-connected rotating speed control method of the energy storage type hydraulic wind generating set is applied to the grid-connected rotating speed control system of the energy storage type hydraulic wind generating set according to claim 1, and is characterized by comprising the following steps:
when the energy storage type hydraulic wind generating set is disturbed, the rotating speed controller (14) acquires the rotating speed of the variable motor (15) through the second rotating speed torque sensor (16), the flow controller (13) acquires the flow of the high-pressure pipeline (6), the grid-connected cabinet (21) acquires the frequency and the voltage of the power grid (22), and then the rotating speed controller (14) outputs a control signal to the variable motor (15) to realize the swing angle control of the variable motor (15) and change the displacement of the variable motor (15) so that the oil pressure of high-pressure oil in the high-pressure pipeline (6) of the hydraulic transmission part also changes correspondingly, thereby changing the rotating speed of the constant delivery pump (5) and releasing the energy stored in the wind turbine;
the power controller (25) collects wind speed through a wind speed predictor (1), the first rotating speed torque sensor (4) collects rotating speed of a wind wheel (2) and outputs impeller torque, the second rotating speed torque sensor (16) collects torque of a generator (20), the grid-connected cabinet (21) collects output power and power grid voltage of the generator (20), then the power controller (25) outputs a control signal to a variable pump motor (17) of a hydraulic energy storage device, the variable pump motor (17) is enabled to be in a motor working condition, high-pressure oil is input into the energy accumulator (18), and the power controller (25) controls the swing angle of the variable pump motor (17) to be increased so as to enable energy in the energy accumulator (18) to be rapidly released;
after disturbance is eliminated, the displacement of the variable displacement motor (15) is planned by the rotating speed controller (14), and the displacement action command of the variable displacement pump motor (17) of the hydraulic energy storage system is planned by the power controller (25) at the same time, so that the variable displacement pump motor (17) performs energy storage and energy discharge under the working condition of the motor, the output power of a unit is adjusted, and power is dynamically injected into the power grid (22) to realize grid side frequency response.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN116378908A (en) * | 2023-04-07 | 2023-07-04 | 浙江大学 | Hydraulic transmission system of wind driven generator and control method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN116378908A (en) * | 2023-04-07 | 2023-07-04 | 浙江大学 | Hydraulic transmission system of wind driven generator and control method |
| CN116378908B (en) * | 2023-04-07 | 2024-02-02 | 浙江大学 | Hydraulic transmission system of wind driven generator and control method |
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