CN116378908A - Hydraulic transmission system of wind driven generator and control method - Google Patents

Hydraulic transmission system of wind driven generator and control method Download PDF

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Publication number
CN116378908A
CN116378908A CN202310391356.1A CN202310391356A CN116378908A CN 116378908 A CN116378908 A CN 116378908A CN 202310391356 A CN202310391356 A CN 202310391356A CN 116378908 A CN116378908 A CN 116378908A
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pressure
pump motor
real
pipeline
variable
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CN116378908B (en
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王峰
汪佳佳
陈金成
徐兵
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Zhejiang University ZJU
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Zhejiang University ZJU
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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
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
    • 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
    • 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
    • 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
    • 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
    • F15B13/027—Check valves
    • 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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Wind Motors (AREA)
  • Control Of Water Turbines (AREA)

Abstract

The application provides a aerogenerator hydraulic drive system and control method, hydraulic drive system includes: the device comprises a blade, a blade shaft, a quantitative pump set, a variable motor set, a pressure regulating branch and a controller. The quantitative pump group converts the kinetic energy of the blade shaft into hydraulic energy. The output end of the quantitative pump set is connected with the input end of the variable motor set through a high-pressure pipeline, the input end of the quantitative pump set is connected with the output end of the variable motor set through a low-pressure pipeline, and the quantitative pump set is used for converting hydraulic energy into mechanical energy. The high pressure pipe is provided with a pressure sensor to detect the real-time pressure of the high pressure pipe. The controller determines the target pressure based on wind speed information, determines the working state of the pressure regulating branch based on the real-time pressure of the high-pressure pipeline and the determined target pressure based on the wind speed change trend, and enables the high-pressure pipeline to quickly reach the target pressure by charging and discharging energy to the high-pressure pipeline. According to the technical scheme, the conversion efficiency of the blades can be improved, the power generation efficiency of the wind driven generator is improved, and the power generation quantity is increased.

Description

Hydraulic transmission system of wind driven generator and control method
Technical Field
The invention relates to the field of wind power generation, in particular to a hydraulic transmission system of a wind power generator and a control method.
Background
The combustion of fossil fuels produces a large amount of carbon dioxide and harmful substances, which exacerbates global warming and environmental pollution. Wind energy is an important renewable energy source, has rich reserves and no pollution, and is increasingly valued by people.
The gear transmission is widely applied to wind driven generators due to the characteristics of mature technology, high efficiency and the like. However, the gear ratio of the gears is constant, and therefore an expensive frequency converter needs to be added to regulate the output of the generator. Meanwhile, larger impact load can be generated when the wind speed changes, so that the gear set is often damaged, and the overall maintenance cost of the wind driven generator is increased. Thus, hydraulic transmission is considered a better alternative.
The power generated by the wind driven generator is related to the wind speed, and the wind driven generator does not work when the wind speed is smaller than the cut-in wind speed and larger than the cut-out wind speed. When the wind speed is between the cut-in wind speed and the rated wind speed, the power increases with increasing wind speed. When the wind speed is larger than the rated wind speed and smaller than the cut-out wind speed, the output power of the wind driven generator is constant. When the wind speed is between the cut-in wind speed and the rated wind speed, in order to ensure the maximum power output, the rotating speed of the blade shaft of the wind driven generator needs to be controlled, and the hydraulic transmission wind driven generator generally controls the system pressure so as to realize the rotating speed control of the blade shaft.
However, the wind speed is continuously changed, and because the moment of inertia of the blade shaft of the wind driven generator is large, the wind speed is changed, but the rotation speed of the blade shaft of the wind driven generator is not changed, so that the power of the wind driven generator is poor, and the expected control effect cannot be achieved.
Disclosure of Invention
In order to solve the problems in the background technology, the invention provides a hydraulic transmission system of a wind driven generator and a control method.
In a first aspect, the present application provides a hydraulic drive system for a wind turbine, comprising:
the device comprises a blade 1, a blade shaft 2, a quantitative pump set 3, a variable motor set 4, a first generator 5, a pressure regulating branch 6 and a controller 10, wherein the quantitative pump set 3 is connected to the blade shaft 2 and is used for converting kinetic energy of the blade shaft 2 into hydraulic energy; the output end of the quantitative pump set 3 is connected with the input end of the variable motor set 4 through a high-pressure pipeline 7; the input end of the quantitative pump set 3 is connected with the output end of the variable motor set 4 through a low-pressure pipeline 8; the output shaft of the variable motor group 4 is connected with the first generator 5; the quantitative pump set 3 is used for converting hydraulic energy into mechanical energy; the pressure regulating branch 6 is connected between the high-pressure pipe 7 and the low-pressure pipe 8; the high-pressure pipeline 7 is provided with a pressure sensor 11, and the pressure sensor 11 is used for detecting the real-time pressure of the high-pressure pipeline 7; the controller 10 is electrically connected to the pressure regulating branch 6, the pressure sensor 11, and the controller 10 is configured to: acquiring wind speed information and real-time pressure of the high-pressure pipeline 7; determining a target pressure of the high-pressure pipeline 7 based on the wind speed information; based on the wind speed change trend, the real-time pressure of the high-pressure pipeline 7 and the determined target pressure of the high-pressure pipeline 7 are obtained in real time, the working state of the pressure regulating branch 6 is determined, and the high-pressure pipeline 7 can quickly reach the target pressure by charging and discharging energy to the high-pressure pipeline 7.
In a possible implementation of the first aspect, the pressure regulating branch 6 includes:
a switch valve 61 for switching on or off the pressure regulating branch 6 according to the real-time pressure of the high pressure pipe 7 and a target pressure;
a first metering pump motor 62a for pressurizing or depressurizing the high-pressure pipe 7 according to the real-time pressure and the target pressure of the high-pressure pipe 7, and converting hydraulic energy into mechanical energy or mechanical energy into hydraulic energy;
a second generator 63 for converting the mechanical energy of the first fixed amount pump motor 62a into electric energy or converting the electric energy into the mechanical energy of the first fixed amount pump motor 62a according to the real-time pressure and the target pressure of the high pressure pipe 7;
the input end 611 of the switch valve 61 is connected to the high-pressure pipe 7, the output end 612 of the switch valve 61 is connected to one end of the first constant-volume pump motor 62a, the other end of the first constant-volume pump motor 62a is connected to the low-pressure pipe 8, and the output shaft of the first constant-volume pump motor 62a is connected to the second generator 63.
In a possible implementation of the first aspect, the pressure regulating branch 6 includes:
a switch valve 61 for switching on or off the pressure regulating branch 6 according to the real-time pressure of the high pressure pipe 7 and a target pressure;
A first variable displacement pump motor 62b for pressurizing or depressurizing the high pressure pipe 7 according to the real-time pressure and the target pressure of the high pressure pipe 7 while converting hydraulic energy into mechanical energy or mechanical energy into hydraulic energy;
a second generator 63 for converting the mechanical energy of the first variable displacement pump motor 62b into electric energy or converting electric energy into mechanical energy of the first variable displacement pump motor 62b according to the real-time pressure and the target pressure of the high pressure pipe 7;
the input end 611 of the switch valve 61 is connected to the high-pressure pipe 7, the output end 612 of the switch valve 61 is connected to one end of the first variable pump motor 62b, the other end of the first variable pump motor 62b is connected to the low-pressure pipe 8, and the output shaft of the first variable pump motor 62b is connected to the second generator 63.
In a possible implementation of the first aspect, the pressure regulating branch 6 includes:
a switch valve 61 for switching on or off the pressure regulating branch 6 according to the real-time pressure of the high pressure pipe 7 and a target pressure;
a first variable displacement pump motor 62b for pressurizing or depressurizing the high pressure pipe 7 according to the real-time pressure and the target pressure of the high pressure pipe 7 while converting hydraulic energy into mechanical energy or mechanical energy into hydraulic energy;
A second constant displacement pump motor 64a for converting mechanical energy of the first variable displacement pump motor 62b into hydraulic energy or converting hydraulic energy into mechanical energy of the first variable displacement pump motor 62b according to the real-time pressure and the target pressure of the high pressure pipe 7;
an accumulator 65 for storing or releasing hydraulic energy according to the real-time pressure and the target pressure of the high-pressure pipe 7;
a first oil tank 66 for storing oil;
the input end 611 of the switch valve 61 is connected to the high-pressure pipe 7, the output end 612 of the switch valve 61 is connected to one end of the first variable displacement pump motor 62b, the other end of the first variable displacement pump motor 62b is connected to the low-pressure pipe 8, the output shaft of the first variable displacement pump motor 62b is connected to the input shaft of the second constant displacement pump motor 64a, one end of the second constant displacement pump motor 64a is connected to the accumulator 65, and the other end of the second constant displacement pump motor 64a is connected to the first oil tank 66.
In a possible implementation of the first aspect, the pressure regulating branch 6 includes:
a switch valve 61 for switching on or off the pressure regulating branch 6 according to the real-time pressure of the high pressure pipe 7 and a target pressure;
a first metering pump motor 62a for pressurizing or depressurizing the high-pressure pipe 7 according to the real-time pressure and the target pressure of the high-pressure pipe 7, and converting hydraulic energy into mechanical energy or mechanical energy into hydraulic energy;
A second variable displacement pump motor 64b for converting mechanical energy of the first constant displacement pump motor 62a into hydraulic energy or converting hydraulic energy into mechanical energy of the first constant displacement pump motor 62a according to the real-time pressure and the target pressure of the high pressure pipe 7;
an accumulator 65 for storing or releasing hydraulic energy according to the real-time pressure and the target pressure of the high-pressure pipe 7;
a first oil tank 66 for storing oil;
the input end 611 of the switch valve 61 is connected to the high-pressure pipe 7, the output end 612 of the switch valve 61 is connected to one end of the first constant pump motor 62a, the other end of the first constant pump motor 62a is connected to the input end of the constant pump unit 3 through the low-pressure pipe 8, the output shaft of the first constant pump motor 62a is connected to the input shaft of the second variable pump motor 64b, one end of the second variable pump motor 64b is connected to the accumulator 65, and the other end of the second variable pump motor 64b is connected to the first oil tank 66.
In a possible implementation of the first aspect, the hydraulic transmission system of the wind driven generator further includes an oil supplementing circuit 9, where the oil supplementing circuit 9 includes a dosing pump 91, a check valve 92, an overflow valve 93, and a second oil tank 94;
The dosing pump 91 is connected in parallel with the dosing pump set 3, the second oil tank 94 is connected to an input end of the dosing pump 91, one end of the one-way valve 92 is connected to an output end of the dosing pump 91, the other end of the one-way valve 92 is connected to the low pressure pipe 8, one end of the overflow valve 93 is connected to the second oil tank 94, and the other end of the overflow valve 93 is connected to the low pressure pipe 8.
In a second aspect, the present application provides a method for controlling a hydraulic transmission system of a wind turbine, for use in a controller 10 of a hydraulic transmission system of a wind turbine according to the first aspect and any one of the possible implementations of the first aspect, the method comprising:
acquiring wind speed information and real-time pressure of the high-pressure pipeline 7;
determining a target pressure of the high-pressure pipeline 7 based on the wind speed information;
based on the wind speed change trend, the real-time pressure of the high-pressure pipeline 7 and the determined target pressure of the high-pressure pipeline 7 are obtained in real time, the working state of the pressure regulating branch 6 is determined, and the high-pressure pipeline 7 can quickly reach the target pressure by charging and discharging energy to the high-pressure pipeline 7.
In a possible implementation manner of the second aspect, the determining, based on the wind speed variation trend, the real-time pressure of the high-pressure pipeline 7 obtained in real time and the determined target pressure of the high-pressure pipeline 7, the working state of the pressure regulating branch 6 includes:
When the wind speed becomes high, the target pressure is higher than the real-time pressure, the switch valve 61 is controlled to be switched on, the second generator 63 drives the first quantitative pump motor 62a to rotate, oil is delivered to the high-pressure pipeline 7 through the switch valve 61, and the pressure of the high-pressure pipeline 7 is quickly increased to the target pressure; when the wind speed becomes smaller, the target pressure is lower than the real-time pressure, the switch valve 61 is controlled to be switched on, part of oil in the high-pressure pipeline 7 flows into the pressure regulating branch 6 through the switch valve 61, so that the pressure of the high-pressure pipeline 7 is quickly reduced to the target pressure, and the first metering pump motor 62a rotates to drive the second generator 63 to generate electricity; when the wind speed is unchanged, the target pressure is equal to the real-time pressure, the switch valve 61 is controlled to be closed, so that the pressure regulating branch 6 is disconnected from the high-pressure pipeline 7, and the first metering pump motor 62a is controlled to stop running; or alternatively
When the wind speed becomes high, the target pressure is higher than the real-time pressure, the switch valve 61 is controlled to be switched on, the second generator 63 drives the first variable pump motor 62b to rotate, oil is delivered to the high-pressure pipeline 7 through the switch valve 61, and the pressure of the high-pressure pipeline 7 is quickly increased to the target pressure; when the wind speed becomes smaller, the target pressure is lower than the real-time pressure, the switch valve 61 is controlled to be switched on, part of oil in the high-pressure pipeline 7 flows into the pressure regulating branch 6 through the switch valve 61, so that the pressure of the high-pressure pipeline 7 is quickly reduced to the target pressure, and the first variable pump motor 62b rotates to drive the second generator 63 to generate electricity; when the wind speed is unchanged, the target pressure is equal to the real-time pressure, the control switch valve 61 is closed, so that the pressure regulating branch 6 is disconnected from the high-pressure pipeline 7, and the first variable pump motor 62b is controlled to stop running.
In a possible implementation manner of the second aspect, the determining, based on the wind speed variation trend, the real-time pressure of the high-pressure pipeline 7 obtained in real time and the determined target pressure of the high-pressure pipeline 7, the working state of the pressure regulating branch 6 includes:
when the wind speed becomes higher, the target pressure is higher than the real-time pressure, the control switch valve 61 is switched on to the left position, a first displacement signal is generated according to the target pressure and the real-time pressure to control the displacement of the first variable displacement pump motor 62b, the first variable displacement pump motor 62b is controlled to be a pump, the second constant displacement pump motor 64a is controlled to be a motor, and oil is output from the energy accumulator 65 to drive the second constant displacement pump motor 64a to rotate and flow into the first oil tank 66. The second constant displacement pump motor 64a drives the first variable displacement pump motor 62b to rotate, and the oil in the low-pressure pipeline 8 flows into the high-pressure pipeline 7 through the first variable displacement pump motor 62b and the switch valve 61, so that the pressure of the high-pressure pipeline 7 is quickly increased; when the wind speed becomes smaller, the target pressure is lower than the real-time pressure, the control switch valve 61 is switched on to the left position, a second displacement signal is generated according to the target pressure and the real-time pressure to control the displacement of the first variable displacement pump motor 62b, the first variable displacement pump motor 62b is controlled to be a motor, the second variable displacement pump motor 64a is controlled to be a pump, the oil in the high-pressure pipeline 7 flows into the low-pressure pipeline 8 through the switch valve 61 and the first variable displacement pump motor 62b, the pressure of the high-pressure pipeline 7 is quickly reduced, the first variable displacement pump motor 62b drives the second variable displacement pump motor 64a to rotate, and the oil is pumped into the energy accumulator 65 from the first oil tank 66 through the second variable displacement pump motor 64 a; when the wind speed is unchanged, the target pressure is equal to the real-time pressure, the switch valve 61 is controlled to be switched to the right position for disconnection, and the first variable displacement pump motor 62b and the second constant displacement pump motor 64a are controlled to stop running according to the ideal target pressure and the real-time pressure; or alternatively
When the wind speed becomes higher, the target pressure is higher than the real-time pressure, the control switch valve 61 is switched on to the left position, a third displacement signal is generated according to the target pressure and the real-time pressure to control the displacement of the second variable pump motor 64b, the first variable pump motor 62a is controlled to be a pump, the second variable pump motor 64b is controlled to be a motor, and oil is output from the energy accumulator 65 to drive the second variable pump motor 64b to rotate and flow into the first oil tank 66; the second variable pump motor 64b drives the first constant pump motor 62a to rotate, and the oil in the low-pressure pipeline 8 flows into the high-pressure pipeline 7 through the first constant pump motor 62a and the switch valve 61, so that the pressure of the high-pressure pipeline 7 is quickly increased; when the wind speed becomes smaller, the target pressure is lower than the real-time pressure, the control switch valve 61 is switched on to the left position, a fourth displacement signal is generated according to the target pressure and the real-time pressure to control the displacement of the second variable pump motor 64b, the first variable pump motor 62a is controlled to be a motor, the second variable pump motor 64b is controlled to be a pump, the oil in the high-pressure pipeline 7 flows into the low-pressure pipeline 8 through the switch valve 61 and the first variable pump motor 62a, the pressure of the high-pressure pipeline 7 is quickly reduced, the first variable pump motor 62a drives the second variable pump motor 64b to rotate, and the oil is pumped into the energy accumulator 65 from the first oil tank 66 through the second variable pump motor 64 b; when the wind speed is unchanged, the target pressure is equal to the real-time pressure, the control switch valve 61 is switched to the right position to be disconnected, and the first metering pump motor 62a and the second variable displacement pump motor 64b are controlled to stop running according to the ideal target pressure and the real-time pressure.
In a possible implementation of the second aspect, the determining the target pressure of the high-pressure pipeline 7 based on the wind speed information includes:
determining an optimal blade shaft rotational speed of the blade shaft 2 based on the wind speed information;
determining a blade shaft control torque based on the blade shaft rotating speed information and the optimal blade shaft rotating speed obtained in real time;
the target pressure of the high-pressure pipe 7 is determined based on a set relationship between the vane shaft control torque and the target pressure of the high-pressure pipe 7.
The utility model provides a ration pump package 3 and variable motor group 4 in the aerogenerator hydraulic drive system are connected through high pressure pipe 7 and low pressure pipe 8 and are constituteed closed circuit, are provided with pressure regulation branch road 6 in this closed circuit, high pressure pipe 7 is equipped with pressure sensor 11 in order to detect the real-time pressure of high pressure pipe 7, and controller 10 is based on wind speed information confirms the target pressure of high pressure pipe 7, then based on wind speed trend, the real-time pressure of high pressure pipe 7 and the target pressure of high pressure pipe 7 of determining that acquires in real time confirm the operating condition of pressure regulation branch road 6, charge and discharge can be carried out high pressure pipe 7 through control pressure regulation branch road 6 to make high pressure pipe 7 pressure arrive target pressure fast, thereby can improve the conversion efficiency of blade 1, promote aerogenerator's generating efficiency, increase the power.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure and do not constitute an undue limitation on the disclosure.
Fig. 1 is a schematic structural diagram of a hydraulic transmission system of a wind driven generator according to an embodiment of the present application;
FIG. 2 is a schematic structural diagram of another hydraulic transmission system of a wind turbine according to an embodiment of the present disclosure;
FIG. 3 is a schematic view of a hydraulic transmission system of another wind turbine according to an embodiment of the present disclosure;
FIG. 4 is a schematic structural diagram of another hydraulic transmission system of a wind turbine according to an embodiment of the present disclosure;
FIG. 5 is a schematic flow chart of a hydraulic transmission system control method for a wind turbine according to an embodiment of the present disclosure;
FIG. 6 is a schematic flow chart for determining a target pressure of a high-pressure pipeline according to wind speed information.
In the figure: 1. the device comprises a blade, 2, a blade shaft, 3, a quantitative pump group, 4, a variable motor group, 5, a first generator, 6, a pressure regulating branch, 61, a switching valve, 611, an input end of the switching valve, 612, an output end of the switching valve, 62a, a first quantitative pump motor, 62b, a first variable pump motor, 63, a second generator, 64a, a second quantitative pump motor, 64b, a second variable pump motor, 65, an accumulator, 66, a first oil tank, 7, a high-pressure pipeline, 8, a low-pressure pipeline, 9, an oil supplementing loop, 91, a quantitative pump, 92, a one-way valve, 93, an overflow valve, 94, a second oil tank, 10, a controller, 11 and a pressure sensor.
Detailed Description
The invention will be described in further detail with reference to the accompanying drawings and specific examples.
In order to enable those skilled in the art to better understand the technical solutions of the present disclosure, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings.
It should be noted that the terms "first," "second," and the like in the description and claims of the present disclosure and in the foregoing figures are used for distinguishing between similar first objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the disclosure described herein may be capable of operation in sequences other than those illustrated or described herein. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present disclosure as detailed in the accompanying claims.
First, referring to fig. 1, fig. 1 is a schematic structural diagram of a hydraulic transmission system of a wind turbine according to an embodiment of the present application. The hydraulic transmission system of the wind driven generator shown in fig. 1 comprises: the device comprises a blade 1, a blade shaft 2, a quantitative pump set 3, a variable motor set 4, a first generator 5, a pressure regulating branch 6 and a controller 10.
Wherein, the quantitative pump group 3 is connected to the blade shaft 2 for converting the kinetic energy of the blade shaft 2 into hydraulic energy. The output end of the quantitative pump group 3 is connected with the input end of the variable motor group 4 through a high-pressure pipeline 7; the input end of the quantitative pump group 3 is connected with the output end of the variable motor group 4 through a low-pressure pipeline 8; the output shaft of the variable motor group 4 is connected with a first generator 5; the quantitative pump group 3 is used for converting hydraulic energy into mechanical energy; the pressure regulating branch 6 is connected between the high-pressure pipeline 7 and the low-pressure pipeline 8; the high-pressure pipeline 7 is provided with a pressure sensor 11, and the pressure sensor 11 is used for detecting the real-time pressure of the high-pressure pipeline 7; the controller 10 is electrically connected with the pressure regulating branch 6 and the pressure sensor 11.
The variable displacement motor group 4 is composed of one or more hydraulic motors, and the number of the hydraulic motors can be determined according to the size of the wind driven generator. When the variable displacement motor group 4 includes a plurality of hydraulic motors, the variable displacement motor group 4 may be configured to be constituted by a plurality of fixed displacement hydraulic motors and one variable displacement hydraulic motor, or the variable displacement motor group 4 may be configured to be constituted by a plurality of variable displacement hydraulic motors, but at least it is ensured that the variable displacement motor group 4 includes at least one variable displacement hydraulic motor.
The controller 10 is configured to: acquiring wind speed information and real-time pressure of the high-pressure pipeline 7; determining a target pressure of the high-pressure pipeline 7 based on wind speed information; based on the wind speed change trend, the real-time pressure of the high-pressure pipeline 7 obtained in real time and the determined target pressure of the high-pressure pipeline 7 determine the working state of the pressure regulating branch 6, and the high-pressure pipeline 7 can quickly reach the target pressure by charging and discharging energy to the high-pressure pipeline 7.
With continued reference to fig. 1, the pressure regulating branch 6 includes: the switch valve 61 is used for switching on or off the pressure regulating branch 6 according to the real-time pressure of the high-pressure pipeline 7 and the target pressure. The first metering pump motor 62a is used for pressurizing or depressurizing the high-pressure pipe 7 according to the real-time pressure and the target pressure of the high-pressure pipe 7, and converting hydraulic energy into mechanical energy or converting mechanical energy into hydraulic energy. The second generator 63 is used for converting the mechanical energy of the first metering pump motor 62a into electric energy or converting the electric energy into the mechanical energy of the first metering pump motor 62a according to the real-time pressure and the target pressure of the high-pressure pipeline 7. The input end 611 of the switch valve 61 is connected to the high-pressure pipe 7, the output end 612 of the switch valve 61 is connected to one end of the first constant-volume pump motor 62a, the other end of the first constant-volume pump motor 62a is connected to the low-pressure pipe 8, and the output shaft of the first constant-volume pump motor 62a is connected to the second generator 63.
For the embodiment shown in fig. 1, in which the controller 10 needs to control the rotation speed of the first metering pump motor 62a to control the flow rate of the pressure regulating branch 6, the general principle of operation of the controller 10 is as follows: when the wind speed increases, the target pressure is greater than the actual pressure, the controller 10 controls the switch valve 61 to switch to the left position, the pressure regulating branch 6 is opened, the energy storage element (the second motor 63 in fig. 1) drives the first metering pump motor 62a to rotate, oil is pumped into the high-pressure pipeline 7 from the low-pressure pipeline 8, and the pressure of the high-pressure pipeline 7 is quickly increased to the target pressure. When the wind speed becomes smaller, the target pressure is smaller than the actual pressure, the controller 10 controls the switch valve 61 to switch to the left position, the pressure regulating branch 6 is opened, part of oil in the high-pressure pipeline 7 flows to the low-pressure pipeline 8 through the pressure regulating branch 6, the first metering pump motor 62a drives the energy storage element to store energy in the second motor 63, and the pressure in the high-pressure pipeline 7 is rapidly reduced to the target pressure. When the wind speed is unchanged, the controller 10 controls the switch valve 61 to switch to the right position, the pressure regulating branch 6 is in a closed state, and the first metering pump motor 62a stops running.
In addition, in order to maintain the pressure of the low pressure pipe 8, an oil replenishing circuit 9 is further provided in the embodiment shown in fig. 1, and the oil replenishing circuit 9 includes a constant displacement pump 91, a check valve 92, an overflow valve 93, and a second oil tank 94. Wherein, the dosing pump 91 is parallelly connected with the dosing pump group 3, and the second oil tank 94 is connected in the input of dosing pump 91, and the one end of check valve 92 is connected in the output of dosing pump 91, and the other end of check valve 92 is connected in low pressure pipeline 8, and the one end of overflow valve 93 is connected in the second oil tank 94, and the other end of overflow valve 93 is connected in low pressure pipeline 8. The metering pump 91 sucks oil from the second oil tank 94 to replenish the low-pressure pipe 8. The check valve 92 ensures one direction of oil flow and prevents suck-back.
It will be appreciated that since the amount of power generated by the wind generator is related to the wind speed, the wind generator is not operated when the wind speed is less than the cut-in wind speed and greater than the cut-out wind speed. When the wind speed is between the cut-in wind speed and the rated wind speed, the power increases with increasing wind speed. When the wind speed is larger than the rated wind speed and smaller than the cut-out wind speed, the output power of the wind driven generator is constant. Therefore, when the wind speed is between the cut-in wind speed and the rated wind speed, the pressure of the high-pressure pipeline 7 in the hydraulic transmission system of the wind driven generator shown in fig. 1 can be determined by the controller 10 based on the wind speed, and then the working state of the pressure regulating branch 6 can be controlled based on the real-time pressure and the target pressure of the high-pressure pipeline 7 based on the wind speed change trend, and the high-pressure pipeline 7 is charged and discharged to realize the rapid pressure regulation of the high-pressure pipeline 7, so that the conversion efficiency of the blades is improved, the power generation efficiency of the wind driven generator is improved, and the power generation quantity is increased.
The hydraulic transmission system of the other 3 wind power generators shown in fig. 2 to 4 will be described in detail. The hydraulic drive system of the wind turbine shown in fig. 2 to 4 is similar to the hydraulic drive system of the wind turbine shown in fig. 1, and differs from the hydraulic drive system of the wind turbine shown in fig. 1 by the specific construction of the pressure regulating branch 6 and the corresponding pressure regulating principle. In order to avoid repetition of the description, in the description of the hydraulic transmission system of the wind turbine shown in fig. 2 to 4, the same parts as those of fig. 1 will not be described in detail, and only the specific structure of the pressure adjusting branch 6 of the hydraulic transmission system of the wind turbine shown in fig. 2 to 4 and the principle of the corresponding pressure adjustment will be described in detail.
The specific construction of the pressure regulating branch 6 of the hydraulic drive system of a wind turbine shown in fig. 2 and the corresponding principle of pressure regulation will be described first.
The pressure regulating branch 6 as shown in fig. 2 comprises: a switch valve 61 for switching the pressure regulating branch 6 on or off according to the real-time pressure of the high-pressure pipe 7 and the target pressure; a first variable displacement pump motor 62b for pressurizing or depressurizing the high pressure pipe 7 according to the real-time pressure and the target pressure of the high pressure pipe 7 while converting hydraulic energy into mechanical energy or mechanical energy into hydraulic energy; a second generator 63 for converting the mechanical energy of the first variable displacement pump motor 62b into electric energy or converting electric energy into the mechanical energy of the first variable displacement pump motor 62b according to the real-time pressure and the target pressure of the high pressure pipe 7; the input end 611 of the switch valve 61 is connected to the high-pressure pipeline 7, the output end 612 of the switch valve 61 is connected to one end of the first variable pump motor 62b, the other end of the first variable pump motor 62b is connected to the low-pressure pipeline 8, and the output shaft of the first variable pump motor 62b is connected to the second generator 63.
Accordingly, the controller 10 shown in fig. 2 needs to control the displacement of the first variable displacement pump motor 62b to control the flow rate of the pressure regulating branch 6, and the principle of the pressure regulation of the embodiment shown in fig. 2 is as follows:
When the wind speed becomes high, the target pressure is higher than the real-time pressure, the switch valve 61 is controlled to be switched on, the second generator 63 drives the first variable pump motor 62b to rotate, oil is delivered to the high-pressure pipeline 7 through the switch valve 61, and the pressure of the high-pressure pipeline 7 is quickly increased to the target pressure; when the wind speed becomes smaller, the target pressure is lower than the real-time pressure, the switch valve 61 is controlled to be switched on, part of oil in the high-pressure pipeline 7 flows into the pressure regulating branch 6 through the switch valve 61, so that the pressure of the high-pressure pipeline 7 is quickly reduced to the target pressure, and the first variable pump motor 62b rotates to drive the second generator 63 to generate electricity; when the wind speed is unchanged, the target pressure is equal to the real-time pressure, the on-off valve 61 is controlled to be closed, so that the pressure regulating branch 6 is disconnected from the high-pressure pipeline 7, and the first variable pump motor 62b is controlled to stop running.
The specific construction of the pressure regulating branch 6 of the hydraulic drive system of a wind turbine shown in fig. 3 and the corresponding principle of pressure regulation will now be described.
The pressure regulating branch 6 as shown in fig. 3 comprises: a switch valve 61 for switching the pressure regulating branch 6 on or off according to the real-time pressure of the high-pressure pipe 7 and the target pressure; a first variable displacement pump motor 62b for pressurizing or depressurizing the high pressure pipe 7 according to the real-time pressure and the target pressure of the high pressure pipe 7 while converting hydraulic energy into mechanical energy or mechanical energy into hydraulic energy; a second fixed displacement pump motor 64a for converting the mechanical energy of the first variable displacement pump motor 62b into hydraulic energy or converting the hydraulic energy into the mechanical energy of the first variable displacement pump motor 62b according to the real-time pressure and the target pressure of the high pressure pipe 7; an accumulator 65 for storing or releasing hydraulic energy according to the real-time pressure and the target pressure of the high-pressure pipe 7; a first oil tank 66 for storing oil;
The input end 611 of the switch valve 61 is connected to the high-pressure pipe 7, the output end 612 of the switch valve 61 is connected to one end of the first variable pump motor 62b, the other end of the first variable pump motor 62b is connected to the low-pressure pipe 8, the output shaft of the first variable pump motor 62b is connected to the input shaft of the second constant pump motor 64a, one end of the second constant pump motor 64a is connected to the accumulator 65, and the other end of the second constant pump motor 64a is connected to the first oil tank 66.
Accordingly, the principle of pressure regulation of the embodiment shown in fig. 3 is:
when the wind speed becomes higher, the target pressure is higher than the real-time pressure, the control switch valve 61 is switched on to the left position, a first displacement signal is generated according to the target pressure and the real-time pressure to control the displacement of the first variable displacement pump motor 62b, the first variable displacement pump motor 62b is controlled to be a pump, the second constant displacement pump motor 64a is a motor, and the oil liquid is output from the energy accumulator 65 to drive the second constant displacement pump motor 64a to rotate and flow into the first oil tank 66. The second constant displacement pump motor 64a drives the first variable displacement pump motor 62b to rotate, and oil in the low-pressure pipeline 8 flows into the high-pressure pipeline 7 through the first variable displacement pump motor 62b and the switch valve 61, so that the pressure of the high-pressure pipeline 7 is quickly increased; when the wind speed becomes smaller, the target pressure is lower than the real-time pressure, the control switch valve 61 is switched on to the left position, a second displacement signal is generated according to the target pressure and the real-time pressure to control the displacement of the first variable displacement pump motor 62b, the first variable displacement pump motor 62b is controlled to be a motor, the second constant displacement pump motor 64a is controlled to be a pump, the oil in the high-pressure pipeline 7 flows into the low-pressure pipeline 8 through the switch valve 61 and the first variable displacement pump motor 62b, the pressure of the high-pressure pipeline 7 is quickly reduced, the first variable displacement pump motor 62b drives the second constant displacement pump motor 64a to rotate, and the oil is pumped into the accumulator 65 from the first oil tank 66 through the second constant displacement pump motor 64 a; when the wind speed is unchanged, the target pressure is equal to the real-time pressure, the control switch valve 61 is switched to the right position to be disconnected, and the first variable displacement pump motor 62b and the second constant displacement pump motor 64a are controlled to stop operating according to the ideal target pressure and the real-time pressure.
The specific construction of the pressure regulating branch 6 of the hydraulic drive system of a wind turbine shown in fig. 4 and the corresponding principle of pressure regulation will now be described.
The pressure regulating branch 6 as shown in fig. 4 comprises: a switch valve 61 for switching the pressure regulating branch 6 on or off according to the real-time pressure of the high-pressure pipe 7 and the target pressure; a first metering pump motor 62a for pressurizing or depressurizing the high-pressure pipe 7 according to the real-time pressure and the target pressure of the high-pressure pipe 7, and converting hydraulic energy into mechanical energy or mechanical energy into hydraulic energy; a second variable displacement pump motor 64b for converting mechanical energy of the first constant displacement pump motor 62a into hydraulic energy or converting hydraulic energy into mechanical energy of the first constant displacement pump motor 62a according to the real-time pressure and the target pressure of the high pressure pipe 7; an accumulator 65 for storing or releasing hydraulic energy according to the real-time pressure and the target pressure of the high-pressure pipe 7; a first oil tank 66 for storing oil;
the input end 611 of the switch valve 61 is connected to the high-pressure pipeline 7, the output end 612 of the switch valve 61 is connected to one end of the first constant pump motor 62a, the other end of the first constant pump motor 62a is connected to the input end of the constant pump unit 3 through the low-pressure pipeline 8, the output shaft of the first constant pump motor 62a is connected to the input shaft of the second variable pump motor 64b, one end of the second variable pump motor 64b is connected to the accumulator 65, and the other end of the second variable pump motor 64b is connected to the first oil tank 66.
Accordingly, the principle of pressure regulation of the embodiment shown in fig. 4 is:
when the wind speed becomes higher, the target pressure is higher than the real-time pressure, the control switch valve 61 is switched on to the left position, a third displacement signal is generated according to the target pressure and the real-time pressure to control the displacement of the second variable pump motor 64b, the first constant pump motor 62a is controlled to be a pump, the second variable pump motor 64b is a motor, and oil is output from the energy accumulator 65 to drive the second variable pump motor 64b to rotate and flow into the first oil tank 66; the second variable pump motor 64b drives the first constant pump motor 62a to rotate, and oil in the low-pressure pipeline 8 flows into the high-pressure pipeline 7 through the first constant pump motor 62a and the switch valve 61, so that the pressure of the high-pressure pipeline 7 rises rapidly; when the wind speed becomes smaller, the target pressure is lower than the real-time pressure, the control switch valve 61 is switched on to the left position, a fourth displacement signal is generated according to the target pressure and the real-time pressure to control the displacement of the second variable pump motor 64b, the first variable pump motor 62a is controlled to be a motor, the second variable pump motor 64b is controlled to be a pump, oil in the high-pressure pipeline 7 flows into the low-pressure pipeline 8 through the switch valve 61 and the first variable pump motor 62a, the pressure of the high-pressure pipeline 7 is quickly reduced, the first variable pump motor 62a drives the second variable pump motor 64b to rotate, and the oil is pumped into the accumulator 65 from the first oil tank 66 through the second variable pump motor 64 b; when the wind speed is unchanged, the target pressure is equal to the real-time pressure, the control switch valve 61 is switched to the right position to be disconnected, and the first metering pump motor 62a and the second variable pump motor 64b are controlled to stop operating according to the ideal target pressure and the real-time pressure.
In other embodiments, it is also possible to provide two variable displacement motor pumps in the pressure regulating branch 6 in the embodiments shown in fig. 3 and 4, i.e. at least one variable element in the pressure regulating branch 6 is ensured, so that the accumulator 65 can be charged and discharged at any high line pressure by changing the displacement.
A method for controlling a hydraulic transmission system of a wind turbine according to the present application will be described in detail with reference to fig. 5. The control method may be executed by the controller 10 in the hydraulic transmission system of the wind turbine shown in fig. 1 to 4, as shown in fig. 5, and the hydraulic transmission system control method of the wind turbine provided in the application includes:
s1: wind speed information and real-time pressure of the high pressure pipe 7 are acquired.
In some embodiments, the hydraulic drive system of the wind power generator may be provided with a speed sensor by means of which the wind speed information is acquired in real time.
The real-time pressure of the high-pressure pipe 7 can be obtained by means of a pressure sensor 11 provided on the high-pressure pipe 7.
S2: the target pressure of the high pressure pipe 7 is determined based on the wind speed information.
In some embodiments, the target pressure of the high pressure pipeline 7 may be determined based on wind speed information based on the method shown in fig. 6, referring to the flowchart shown in fig. 6, including:
S21: determining an optimal blade shaft rotational speed of the blade shaft 2 based on the wind speed information;
s22: determining a blade shaft control torque based on the blade shaft rotating speed information and the optimal blade shaft rotating speed obtained in real time;
s23: the target pressure of the high-pressure pipe 7 is determined based on a set relationship between the blade shaft control torque and the target pressure of the high-pressure pipe 7.
In particular, since the wind speed is between the cut-in wind speed and the rated wind speed, it is necessary to ensure that the wind turbine blades are maintained at the optimum tip speed ratio at all times in order to obtain maximum blade conversion efficiency. The relationship between the optimum blade shaft rotational speed and the optimum tip speed ratio is as follows:
Figure BDA0004175962450000151
wherein lambda is 0 For optimum tip speed ratio, ω o For optimal blade shaft rotational speed, R is blade radius and v is wind speed. As can be seen from equation 1, in order to obtain maximum blade conversion efficiency, the blade shaft rotational speed needs to be changed along with the wind speed. Thus, the optimum blade shaft rotational speed ω o Can be obtained by simple calculation through the formula 1.
In addition, it is necessary to control the blade shaft rotational speed by a control torque as follows:
Figure BDA0004175962450000152
wherein T is c To control torque, ρ is air density, A is blade shaft rotational area, C pmax For maximum conversion efficiency of the blade, ω is the blade shaft speed.
As the wind speed changes, the rotation speed of the blade shaft changes along with the change of the wind speed until ω=ω o When the blade shaft reaches a steady state, the steady state can be calculated by equation 2
Figure BDA0004175962450000153
And because the control torque is related to the high pressure pipeline control pressure as follows:
Figure BDA0004175962450000161
wherein P is 1 For controlling the pressure of the high-pressure pipe 7, P 2 The pressure of the low-pressure pipe 8 is controlled to a certain value by the relief valve 93. η (eta) pm To quantify the mechanical efficiency of the pump group 3, D p For quantifying the total displacement of the pump group 3.
The control pressure of the high-pressure pipeline 7 controls the pressure change of the high-pressure pipeline 7 through pressure closed-loop control, and when the rotation speed of the blade shaft reaches the optimal rotation speed of the blade shaft or the pressure of the high-pressure pipeline (namely the real-time pressure) reaches the optimal high-pressure pipelineAt the rail pressure (i.e., the target pressure described above), steady state is reached. At this time, the high-pressure line pressure is equal to the high-pressure line control pressure, and therefore, the target pressure is the optimum high-pressure line pressure
Figure BDA0004175962450000162
Figure BDA0004175962450000163
S3: based on the wind speed change trend, the real-time pressure of the high-pressure pipeline 7 obtained in real time and the determined target pressure of the high-pressure pipeline 7 determine the working state of the pressure regulating branch 6, and the high-pressure pipeline 7 can quickly reach the target pressure by charging and discharging energy to the high-pressure pipeline 7.
For details, reference is made to the above description of the pressure adjustment principle in the embodiments of fig. 1 to 4, and the description is omitted here.
The utility model provides a aerogenerator hydraulic drive system confirms the target pressure of high-pressure pipeline 7 based on wind speed information, then based on wind speed variation trend, the real-time pressure of high-pressure pipeline 7 that acquires in real time and the target pressure of high-pressure pipeline 7 who determines confirm, confirm the operating condition of pressure regulation branch road 6, charge and release can to high-pressure pipeline 7 through control pressure regulation branch road 6 to make high-pressure pipeline 7 pressure arrive target pressure fast. The target pressure is determined based on the set relation between the blade shaft control torque and the target pressure of the high-pressure pipeline 7, and the blade shaft control torque is determined based on the optimal blade shaft rotating speed corresponding to the real-time wind speed, so that the pressure of the high-pressure pipeline 7 can reach the target pressure quickly, the corresponding blade shaft rotating speed is the optimal blade shaft rotating speed under the target pressure, the conversion efficiency of the blade can be improved, the power generation efficiency of the wind driven generator is improved, and the power generation quantity is increased.
The foregoing is merely a preferred embodiment of the present application and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present application and are intended to be comprehended within the scope of the present application.

Claims (10)

1. A hydraulic drive system for a wind turbine, comprising:
the blade (1), the blade shaft (2), the quantitative pump group (3), the variable motor group (4), the first generator (5), the pressure regulating branch (6) and the controller (10),
the quantitative pump set (3) is connected to the blade shaft (2) and is used for converting kinetic energy of the blade shaft (2) into hydraulic energy;
the output end of the quantitative pump set (3) is connected with the input end of the variable motor set (4) through a high-pressure pipeline (7); the input end of the quantitative pump set (3) is connected with the output end of the variable motor set (4) through a low-pressure pipeline (8); an output shaft of the variable motor group (4) is connected with the first generator (5); the quantitative pump set (3) is used for converting hydraulic energy into mechanical energy;
the pressure regulating branch (6) is connected between the high-pressure pipeline (7) and the low-pressure pipeline (8); the high-pressure pipeline (7) is provided with a pressure sensor (11), and the pressure sensor (11) is used for detecting the real-time pressure of the high-pressure pipeline (7); the controller (10) is electrically connected to the pressure regulating branch (6), the pressure sensor (11), and the controller (10) is for:
acquiring wind speed information and real-time pressure of a high-pressure pipeline (7);
Determining a target pressure of the high-pressure pipeline (7) based on the wind speed information;
based on the wind speed change trend, real-time pressure of the high-pressure pipeline (7) and the determined target pressure of the high-pressure pipeline (7) are obtained in real time, the working state of the pressure regulating branch (6) is determined, and the high-pressure pipeline (7) can quickly reach the target pressure by charging and discharging energy to the high-pressure pipeline (7).
2. A hydraulic transmission system of a wind power generator according to claim 1, characterized in that the pressure regulating branch (6) comprises:
a switching valve (61) for switching the pressure regulating branch (6) on or off in dependence on the real-time pressure of the high-pressure line (7) and a target pressure;
a first metering pump motor (62 a) for pressurizing or depressurizing the high-pressure pipe (7) according to the real-time pressure and the target pressure of the high-pressure pipe (7), and converting hydraulic energy into mechanical energy or mechanical energy into hydraulic energy;
a second generator (63) for converting the mechanical energy of the first metering pump motor (62 a) into electric energy or converting electric energy into the mechanical energy of the first metering pump motor (62 a) according to the real-time pressure and the target pressure of the high-pressure pipe (7);
The input end (611) of the switch valve (61) is connected with the high-pressure pipeline (7), the output end (612) of the switch valve (61) is connected with one end of the first metering pump motor (62 a), the other end of the first metering pump motor (62 a) is connected with the low-pressure pipeline (8), and the output shaft of the first metering pump motor (62 a) is connected with the second generator (63).
3. A hydraulic transmission system of a wind power generator according to claim 1, characterized in that the pressure regulating branch (6) comprises:
a switching valve (61) for switching the pressure regulating branch (6) on or off in dependence on the real-time pressure of the high-pressure line (7) and a target pressure;
a first variable displacement pump motor (62 b) for pressurizing or depressurizing the high pressure pipe (7) according to the real-time pressure and the target pressure of the high pressure pipe (7), while converting hydraulic energy into mechanical energy or converting mechanical energy into hydraulic energy;
a second generator (63) for converting the mechanical energy of the first variable displacement pump motor (62 b) into electric energy or electric energy into the mechanical energy of the first variable displacement pump motor (62 b) according to the real-time pressure and the target pressure of the high pressure pipe (7);
the input end (611) of the switch valve (61) is connected with the high-pressure pipeline (7), the output end (612) of the switch valve (61) is connected with one end of the first variable pump motor (62 b), the other end of the first variable pump motor (62 b) is connected with the low-pressure pipeline (8), and the output shaft of the first variable pump motor (62 b) is connected with the second generator (63).
4. A hydraulic transmission system of a wind power generator according to claim 1, characterized in that the pressure regulating branch (6) comprises:
a switching valve (61) for switching the pressure regulating branch (6) on or off in dependence on the real-time pressure of the high-pressure line (7) and a target pressure;
a first variable displacement pump motor (62 b) for pressurizing or depressurizing the high pressure pipe (7) according to the real-time pressure and the target pressure of the high pressure pipe (7), while converting hydraulic energy into mechanical energy or converting mechanical energy into hydraulic energy;
a second constant displacement pump motor (64 a) for converting mechanical energy of the first variable displacement pump motor (62 b) into hydraulic energy or converting hydraulic energy into mechanical energy of the first variable displacement pump motor (62 b) according to the real-time pressure and the target pressure of the high pressure pipe (7);
-an accumulator (65) for storing or releasing hydraulic energy depending on the real-time pressure and the target pressure of the high pressure conduit (7);
a first oil tank (66) for storing oil;
the input end (611) of the switch valve (61) is connected with the high-pressure pipeline (7), the output end (612) of the switch valve (61) is connected with one end of the first variable pump motor (62 b), the other end of the first variable pump motor (62 b) is connected with the low-pressure pipeline (8), the output shaft of the first variable pump motor (62 b) is connected with the input shaft of the second variable pump motor (64 a), one end of the second variable pump motor (64 a) is connected with the energy accumulator (65), and the other end of the second variable pump motor (64 a) is connected with the first oil tank (66).
5. A hydraulic transmission system of a wind power generator according to claim 1, characterized in that the pressure regulating branch (6) comprises:
a switching valve (61) for switching the pressure regulating branch (6) on or off in dependence on the real-time pressure of the high-pressure line (7) and a target pressure;
a first metering pump motor (62 a) for pressurizing or depressurizing the high-pressure pipe (7) according to the real-time pressure and the target pressure of the high-pressure pipe (7), and converting hydraulic energy into mechanical energy or mechanical energy into hydraulic energy;
a second variable displacement pump motor (64 b) for converting mechanical energy of the first constant displacement pump motor (62 a) into hydraulic energy or converting hydraulic energy into mechanical energy of the first constant displacement pump motor (62 a) according to the real-time pressure and the target pressure of the high pressure pipe (7);
-an accumulator (65) for storing or releasing hydraulic energy depending on the real-time pressure and the target pressure of the high pressure conduit (7);
a first oil tank (66) for storing oil;
the input end (611) of the switch valve (61) is connected with the high-pressure pipeline (7), the output end (612) of the switch valve (61) is connected with one end of the first variable pump motor (62 a), the other end of the first variable pump motor (62 a) is connected with the input end of the quantitative pump set (3) through the low-pressure pipeline (8), the output shaft of the first variable pump motor (62 a) is connected with the input shaft of the second variable pump motor (64 b), one end of the second variable pump motor (64 b) is connected with the energy accumulator (65), and the other end of the second variable pump motor (64 b) is connected with the first oil tank (66).
6. A hydraulic transmission system of a wind power generator according to claim 1, further comprising an oil supplementing circuit (9), said oil supplementing circuit (9) comprising a dosing pump (91), a one-way valve (92), an overflow valve (93), a second oil tank (94);
the quantitative pump (91) is connected with the quantitative pump set (3) in parallel, the second oil tank (94) is connected to the input end of the quantitative pump (91), one end of the one-way valve (92) is connected to the output end of the quantitative pump (91), the other end of the one-way valve (92) is connected to the low-pressure pipeline (8), one end of the overflow valve (93) is connected to the second oil tank (94), and the other end of the overflow valve (93) is connected to the low-pressure pipeline (8).
7. A method of controlling a hydraulic drive system of a wind turbine, a controller (10) for a hydraulic drive system of a wind turbine according to any one of claims 1 to 6, comprising:
acquiring wind speed information and real-time pressure of a high-pressure pipeline (7);
determining a target pressure of the high-pressure pipeline (7) based on the wind speed information;
based on the wind speed change trend, real-time pressure of the high-pressure pipeline (7) and the determined target pressure of the high-pressure pipeline (7) are obtained in real time, the working state of the pressure regulating branch (6) is determined, and the high-pressure pipeline (7) can quickly reach the target pressure by charging and discharging energy to the high-pressure pipeline (7).
8. The method for controlling the hydraulic transmission system of the wind driven generator according to claim 7, wherein the determining the working state of the pressure regulating branch (6) based on the real-time pressure of the high-pressure pipeline (7) obtained in real time and the determined target pressure of the high-pressure pipeline (7) based on the wind speed variation trend includes:
when the wind speed becomes high, the target pressure is higher than the real-time pressure, the control switch valve (61) is switched on, the second generator (63) drives the first metering pump motor (62 a) to rotate, oil is delivered to the high-pressure pipeline (7) through the switch valve (61), and the pressure of the high-pressure pipeline (7) is quickly increased to the target pressure; when the wind speed is reduced, the target pressure is lower than the real-time pressure, the switch valve (61) is controlled to be switched on, part of oil in the high-pressure pipeline (7) flows into the pressure regulating branch (6) through the switch valve (61), so that the pressure of the high-pressure pipeline (7) is quickly reduced to the target pressure, and the first metering pump motor (62 a) rotates to drive the second generator (63) to generate electricity; when the wind speed is unchanged, the target pressure is equal to the real-time pressure, the switch valve (61) is controlled to be closed, so that the pressure regulating branch (6) is disconnected from the high-pressure pipeline (7), and the first metering pump motor (62 a) is controlled to stop running; or alternatively
When the wind speed becomes high, the target pressure is higher than the real-time pressure, the control switch valve (61) is connected, the second generator (63) drives the first variable pump motor (62 b) to rotate, oil is delivered to the high-pressure pipeline (7) through the switch valve (61), and the pressure of the high-pressure pipeline (7) is quickly increased to the target pressure; when the wind speed is reduced, the target pressure is lower than the real-time pressure, the switch valve (61) is controlled to be switched on, part of oil in the high-pressure pipeline (7) flows into the pressure regulating branch (6) through the switch valve (61), so that the pressure of the high-pressure pipeline (7) is quickly reduced to the target pressure, and the first variable pump motor (62 b) rotates to drive the second generator (63) to generate electricity; when the wind speed is unchanged, the target pressure is equal to the real-time pressure, the control switch valve (61) is closed, the pressure regulating branch circuit (6) is disconnected from the high-pressure pipeline (7), and the first variable pump motor (62 b) is controlled to stop running.
9. The method for controlling the hydraulic transmission system of the wind driven generator according to claim 7, wherein the determining the working state of the pressure regulating branch (6) based on the real-time pressure of the high-pressure pipeline (7) obtained in real time and the determined target pressure of the high-pressure pipeline (7) based on the wind speed variation trend includes:
When the wind speed becomes larger, the target pressure is higher than the real-time pressure, the control switch valve (61) is switched on to the left position, a first displacement signal is generated according to the target pressure and the real-time pressure to control the displacement of the first variable displacement pump motor (62 b), the first variable displacement pump motor (62 b) is controlled to be a pump, the second constant displacement pump motor (64 a) is controlled to be a motor, and oil is output from the energy accumulator (65) to drive the second constant displacement pump motor (64 a) to rotate and flow into the first oil tank (66). The second constant displacement pump motor (64 a) drives the first variable displacement pump motor (62 b) to rotate, and oil in the low-pressure pipeline (8) flows into the high-pressure pipeline (7) through the first variable displacement pump motor (62 b) and the switch valve (61), so that the pressure of the high-pressure pipeline (7) is quickly increased; when the wind speed is reduced, the target pressure is lower than the real-time pressure, the control switch valve (61) is switched on to the left position, a second displacement signal is generated according to the target pressure and the real-time pressure to control the displacement of the first variable displacement pump motor (62 b), the first variable displacement pump motor (62 b) is controlled to be a motor, the second variable displacement pump motor (64 a) is controlled to be a pump, oil in the high-pressure pipeline (7) flows into the low-pressure pipeline (8) through the switch valve (61) and the first variable displacement pump motor (62 b), the pressure of the high-pressure pipeline (7) is reduced rapidly, the first variable displacement pump motor (62 b) drives the second variable displacement pump motor (64 a) to rotate, and the oil is pumped into the energy accumulator (65) from the first oil tank (66) through the second variable displacement pump motor (64 a); when the wind speed is unchanged, the target pressure is equal to the real-time pressure, the control switch valve (61) is switched to the right position to be disconnected, and the first variable displacement pump motor (62 b) and the second constant displacement pump motor (64 a) are controlled to stop running according to the ideal target pressure and the real-time pressure; or alternatively
When the wind speed becomes higher, the target pressure is higher than the real-time pressure, the control switch valve (61) is switched on to the left position, a third displacement signal is generated according to the target pressure and the real-time pressure to control the displacement of the second variable pump motor (64 b), the first constant pump motor (62 a) is controlled to be a pump, the second variable pump motor (64 b) is controlled to be a motor, and oil is output from the energy accumulator (65) to drive the second variable pump motor (64 b) to rotate and flow into the first oil tank (66); the second variable pump motor (64 b) drives the first constant pump motor (62 a) to rotate, and oil in the low-pressure pipeline (8) flows into the high-pressure pipeline (7) through the first constant pump motor (62 a) and the switch valve (61) so that the pressure of the high-pressure pipeline (7) rises rapidly; when the wind speed is reduced, the target pressure is lower than the real-time pressure, the control switch valve (61) is switched on to the left position, a fourth displacement signal is generated according to the target pressure and the real-time pressure to control the displacement of the second variable pump motor (64 b), the first variable pump motor (62 a) is controlled to be a motor, the second variable pump motor (64 b) is controlled to be a pump, oil in the high-pressure pipeline (7) flows into the low-pressure pipeline (8) through the switch valve (61) and the first variable pump motor (62 a), the pressure of the high-pressure pipeline (7) is rapidly reduced, the first variable pump motor (62 a) drives the second variable pump motor (64 b) to rotate, and the oil is pumped into the energy accumulator (65) from the first oil tank (66) through the second variable pump motor (64 b); when the wind speed is unchanged, the target pressure is equal to the real-time pressure, the control switch valve (61) is switched to the right position to be disconnected, and meanwhile, the first metering pump motor (62 a) and the second metering pump motor (64 b) are controlled to stop running according to the ideal target pressure and the real-time pressure.
10. A method of controlling a hydraulic drive system of a wind power generator according to claim 7, wherein said determining a target pressure of a high pressure pipe (7) based on said wind speed information comprises:
determining an optimal blade axis rotational speed of the blade axis (2) based on the wind speed information;
determining a blade shaft control torque based on the blade shaft rotating speed information and the optimal blade shaft rotating speed obtained in real time;
a target pressure of the high-pressure pipe (7) is determined based on a set relationship between the blade shaft control torque and the target pressure of the high-pressure pipe (7).
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